Patent Application
20200248692
The present disclosure relates to a compressor, and more specifically, to a scroll compressor.
Compressors are devices for compressing fluids such as refrigerant gases. They may be classified as rotary compressors, reciprocating compressors, scroll compressors and the like, based on the method of compressing fluids.
In a scroll compressor, a plurality of compression chambers may be created between two scrolls while the two scrolls relatively orbit, the compression chambers continuously move in a central direction, and their volume is reduced. Accordingly, refrigerants are continuously suctioned, compressed and discharged.
Referring to
The accommodation space of the casing 1 is divided into a suction space (S1) that communicates with an inlet port 11 and a discharge space (S2) that communicates with a discharge port 12, by a main frame 6. The suction space (S1) is partitioned into a suction chamber 15 that communicates with the inlet port 11, and a discharge chamber 16 that communicates the compression chamber (P) with the discharge space (S2).
The fixed scroll 2 is provided with a fixed lap 21 that is fixed in front of the main frame 6. An orbiting scroll 3, which has an orbiting lap 31 to form a pair of compression chambers (S), is coupled to the fixed scroll 2. Additionally, an Oldham's ring that prevents self-rotation of the orbiting scroll 3 is installed between the orbiting scroll 3 and the main frame 6.
A shaft supporter 61 that supports the crank shaft 5 in a radial direction is formed at the center of the main frame 6. A main bearing 62 that supports the crank shaft 5 in a radial direction is installed in the shaft supporter 61.
A sub frame 8 that supports the crank shaft 5 together with the main frame 6 is spaced a certain distance apart from one side of the main frame 6 and is coupled and fixed to one side of the main frame 6. The driving motor 4 that generates rotational force is installed in the discharge space 16 between the main frame 6 and the sub frame 8.
In the non-described symbols of the drawing, 22 indicates a suction port, 23 indicates an exhaust port, 32 indicates a boss part, 33 indicates a pin bearing, 41 indicates a stator of the driving motor, 51 indicates an oil flow passage, 81 indicates a sub bearing that supports the crank shaft in a radial direction, 82 indicates an oil pump, and 9 indicates an inverter.
The above-described scroll compressor operates as follows.
When the driving motor 4 is supplied with power, the orbiting scroll 3 orbits by an eccentric distance on the upper surface of the main frame 6 by the Oldham's ring 7 while the crank shaft 5 rotates together with a rotor 42 of the driving motor 4. Accordingly, a pair of compression chambers (P) are continuously formed between the fixed lap 21 and the orbiting lap 31.
The compression chamber (P) moves to the center by continuous orbital motions of the orbiting scroll 3, and volume is reduced. Accordingly, refrigerant gases are suctioned into the suction space (S1) of the casing 1 through the inlet port 11. The suctioned refrigerant gases are discharged to the discharge space (S2) of the casing 1 through the exhaust port 23 while being suctioned into and compressed in the compression chamber (P) through the suction port 22 provided in the fixed scroll 2. The discharged refrigerant gases circulate in the refrigeration cycle and are suctioned again into the suction space (S1) of the casing 1. That is, in the scroll compressor, a series of processes, in which refrigerant gases are suctioned, compressed and discharged, and in which the discharged refrigerant gases are suctioned, compressed and discharged again, are repeated.
A scroll compressor with the above-described configuration is generally provided with an interior rotor-type motor, i.e., the driving motor 4 in which the stator 41 is placed outside of a motor and in which the rotor 42 is placed inside the stator 41.
In the scroll compressor provided with the above-described driving motor 4, the crank shaft 5 is used to deliver driving force of the driving motor 4 to the orbiting scroll 2. The crank shaft 5 is required to penetrate between a space in which the driving motor 4 is installed and a space in which the compression chamber (P) is formed. Accordingly, a shaft seal has to be installed to seal the perimeter of the crank shaft 5 in a portion through which the crank shaft 5 passes. Thus, friction losses, caused by friction between the shaft seal and the crank shaft 5, increase.
In the scroll compressor with the above-described configuration, the main frame 6 has to be installed between the space in which the driving motor 4 is installed and the space in which the compression chamber (P) is formed, to separate the suction space (S1) and the discharge space (S2). In this case, the scroll compressor may not become compact due to the main frame 6.
The scroll compressor with the above-described configuration further includes a sub frame 8 in addition to the main frame 6 to stably support the crank shaft 5. In this case, a plurality of bearings is additionally required. Thus, the number of components increases, man-hours increase due to an increase in the number of components, and the size of the scroll compressor also increases.
One objective of the present disclosure is to provide a scroll compressor having an improved structure in which other components required for driving the scroll compressor may perform the functions of a crank shaft and a main frame, thereby scaling down the scroll compressor and enhancing performance of the scroll compressor.
Another objective of the present disclosure is to provide a scroll compressor in which the number of components and man-hours may be reduced, thereby reducing costs of manufacturing the scroll compressor and scaling down the scroll compressor.
The scroll compressor according to the present disclosure may comprise an orbiting scroll that is directly connected to an outer rotor-type motor and is orbited.
Specifically, a motor may be provided in the form of an outer rotor-type motor in which a rotor is placed outside of a stator fixed to a housing, and the orbiting scroll may be directly connected to the rotor and is orbited by rotation of the rotor. Accordingly, the rotor of the motor, which is a component required for driving the scroll compressor, may perform the functions of a crank shaft and a main frame.
In the scroll compressor according to the present disclosure, components constituting the scroll compressor may be integrated based on each assembly unit.
Specifically, an orbiting scroll module may be provided as a single component in which the orbiting scroll and a first projection are integrated, and a second housing, which is a component constituting the housing, may be provided as a single component in which a fixed scroll and a second projection are integrated. When components constituting the scroll compressor are integrated based on each assembly unit, the number of components required for manufacturing a scroll housing may be reduced, thereby decreasing man-hours, manufacturing costs and making the scroll housing smaller.
The scroll compressor may comprise a housing comprising an accommodation space, an inlet port on one side of the housing in a length-wise direction of the housing and a discharge port on another side of the housing in the length-wise direction of the housing, a motor disposed in the accommodation space, a fixed scroll disposed in the accommodation space, the fixed scroll being closer to the discharge port than to the motor, and an orbiting scroll module disposed between the motor and the fixed scroll, the orbiting scroll module being engaged with the fixed scroll to form a compression chamber. The motor may comprise a stator fixed to the housing, and a rotor placed outside of the stator in a diameter-wise direction of the stator. The rotor may be configured to rotate around the stator, the orbiting scroll module may be disposed between the rotor and the fixed scroll, and the orbiting scroll module may be directly connected to the rotor and be orbited by rotation of the rotor.
The rotor provided in an outer rotor-type motor may comprise a skirt configured to encircle the outer surface of the stator in the diameter-wise direction of the stator, and a rotation surface configured to form a flat surface facing the orbiting scroll module. The rotation surface may be coupled to the skirt and disposed closer to the orbiting scroll module than the skirt.
The skirt and rotation surface of the rotor may be configured to rotate outside of the stator integrally, and the orbiting scroll module may be directly connected to the rotation surface and may be orbited by rotation of the rotation surface.
The motor may further comprise an eccentric shaft placed eccentrically with respect to the rotation surface, and the orbiting scroll module may be coupled to the eccentric shaft and may be configured to orbit along the eccentric shaft.
Additionally, the orbiting scroll module may comprise an orbiting scroll comprising an orbiting head plate configured to form a flat surface parallel to the rotation surface and that includes an orbiting lap protruding from the orbiting head plate in a thickness-wise direction of the orbiting head plate, and a concave coupling groove formed on one surface of the orbiting head plate facing the rotation surface. The eccentric shaft may be rotatably inserted into and coupled to the coupling groove.
A driving bearing, rotatably coupled to the eccentric shaft, may be fixed to the coupling groove.
Additionally, the housing may be a first housing , and the scroll compressor may further comprise a second housing disposed on the another side of the first housing. The second housing may comprise the discharge port and may be configured to cover the opening.
The second housing may comprise a cover configured to cover the opening, and a coupler forming a surface parallel to the outer circumferential surface of the first housing, and the coupler may be coupled to the other side of the first housing in the length-wise direction of the first housing, and that couples the cover to the first housing.
The fixed scroll may be placed on the inner surface of the cover facing the motor or the orbiting scroll module in the accommodation space, and the discharge port may be coupled to the fixed scroll while passing through the cover.
Additionally, the orbiting scroll module may comprise a first projection protruding outward from the orbiting head plate in a diameter-wise direction of the orbiting head plate, and the scroll compressor may further comprise a second projection interfering with the first projection and blocking self-rotation of the orbiting scroll.
The first projection may protrude from the orbiting head plate toward the coupler, and the second projection may protrude from the inner surface of the coupler toward the orbiting head plate.
A plurality of first projections may be disposed at regular intervals in a circumferential direction of the orbiting head plate.
A first insertion groove, may be formed between two adjacent first projections. The second projection may be configured to be inserted into the first insertion groove.
A plurality of second projections may be disposed at regular intervals in a circumferential direction of the coupler.
A second insertion groove may be formed between two adjacent second projections. The first projection may be configured to be inserted into the second insertion groove.
The first projection inserted into the second insertion groove and the second projection inserted into the first insertion groove may be configured to interfere with each other to block self-rotation of the orbiting scroll.
The second projection may protrude from the inner circumferential surface of the coupler in the circumferential direction of the coupler while forming a curved surface, and the first insertion groove may be concave and formed between two adjacent second projections while forming a curved surface corresponding to the shape of the second projection.
The first insertion groove may be formed by connecting surfaces of two adjacent first projections facing each other in a curved shape corresponding to the shape of the second projection.
Additionally, the first projection and the orbiting scroll may be integrally formed, and the second projection and the second housing may be integrally formed.
The orbiting scroll may comprise a suction port, and the fixed scroll may comprise an exhaust port. The suction port and the exhaust port may be coupled to the discharge port.
The housing may comprise a supporter disposed between the inlet port and the discharge port and that is fixed to one side of the first housing in the length-wise direction of the first housing.
The supporter may be disposed at a rotation center of the rotor, the stator may be fixed to the outer surface of the supporter in a circumferential direction of the supporter, and the rotor may be rotatably coupled to the supporter.
Additionally, one side of the supporter in a length-wise direction thereof may be fixed to the first housing, and the scroll compressor may further comprise a main bearing configured to rotatably couple the rotation surface to the supporter.
The main bearing may be in contact with one surface of the rotation surface facing the supporter, and may be fixed to the rotation surface. A fixation rib encircling the outer surface of the main bearing in a circumferential direction of the main bearing may protrude from one surface of the rotation surface facing the supporter.
The orbiting scroll module may comprise a back pressure hole configured to pass through the orbiting scroll and form a passage connecting the compression chamber and a gap between the rotation surface and the orbiting head plate.
The back pressure hole may comprise a through hole shape configured to pass through the orbiting head plate in a thickness-wise direction of the orbiting head plate, and the orbiting scroll module may further comprise a sealing member disposed between the rotation surface and the orbiting head plate. The sealing member may be configured to encircle the back pressure hole outside of the orbiting head plate in a diameter-wise direction of the orbiting head plate.
The scroll compressor of the present disclosure may allow the orbiting scroll to directly connect to the rotor of an outer rotor-type motor and to orbit, and accordingly, the rotor of the motor, which is a component required for driving the scroll compressor, may perform the functions of a crank shaft and a main frame. The effects of the scroll compressor are described as follows.
That is, the present disclosure may provide a scroll compressor without a crank shaft and a main frame, which may reduce friction losses that might be increased due to the crank shaft and the main frame, and which may reduce the size of the scroll compressor, which would be otherwise increased due to space occupied by the crank shaft and the main frame, thereby enhancing performance of the scroll compressor and scaling down the scroll compressor.
Additionally, the present disclosure may provide a scroll compressor without a crank shaft, in which the number of components required for supporting the crank shaft, assembly man-hours spent on manufacturing the scroll compressor, and the weight and size of the scroll compressor may be effectively reduced.
Further, the present disclosure may provide a scroll compressor in which components constituting the scroll compressor are integrated based on each assembly unit, thereby reducing the number of components, assembly man-hours and manufacturing costs required for manufacturing a scroll housing, and making a scroll housing smaller.
Embodiments are described in detail with reference to the following drawings, wherein:
Below, embodiments of the scroll compressor according to the embodiments of the present disclosure are described with reference to the attached drawings. During description of the embodiments, the thickness of lines or the size of the elements illustrated in the drawings may be exaggerated for the sake of convenience and clarity in description. Further, the terms that are described hereunder are those defined considering the functions described in the present disclosure and may differ depending on the intention or the practice of the user or operator. Therefore, such terms should be defined on the basis of what is described throughout the specification.
Referring to
The housing 110, 120 may define an appearance of the scroll compressor 100 according to the embodiment. An accommodation space configured to accommodate various components constituting the scroll compressor 100 may be formed inside the housing 110,120.
In the embodiment, the housing 110,120 formed in the shape of an approximately lying cylinder may be provided as an example. An inlet port 110a may be formed on one side (referred to as “left side”) of the housing 110,120, i.e., the bottom (referred to as “left bottom”) on one side of the housing 110,120 in a length-wise direction of the housing 110,120. Additionally, a discharge port 120a may be formed on the other side (referred to as “right side”) of the housing 110,120, i.e., the bottom (referred to as “right bottom”) on the other side of the housing 110,120 in the length-wise direction of the housing 110,120. The inlet port 110a may be a passage formed in the housing 110,120 to introduce refrigerants into the housing 110,120, and the discharge port 120a may be a passage formed in the housing 110,120 to discharge refrigerants, compressed inside the housing 110,120, out of the housing 110,120.
The accommodation space of the housing 110,120 may be divided into a motor part (A) that is a space in which the motor 130 may be installed, and a compression part (B) that is a space in which refrigerants may be compressed.
Though not illustrated, a front housing that is connected to the right bottom 121 of the housing 110,120 and that covers the right side of the compression part (B) may be installed on the right side of the compression part (B). Additionally, a rear cover that is connected to the left bottom of the housing 110,120 and that accommodates an inverter may be installed on the left side of the motor part (A). The inverter may be provided as a control unit that may control driving of the scroll compressor 100.
The motor 130 may be accommodated in the accommodation space of the housing 110,120, specifically, the motor part (A). The motor 130 comprising a stator 131 and a rotor 135 may be provided in the form of an outer rotor-type motor. A constant speed motor in which a rotor 135 rotates at constant speeds may be used as the motor 130. However, an inverter motor in which rotational speed of the rotor 135 is variable may also be used as the motor 130.
The stator 131 may be placed at the center of the motor 130 and may be fixed to the housing 110,120. That is, the stator 131 may be placed at the center of a radius of rotation of the motor 130 rather than the rotor 135, may be coupled to a supporter 115 in the housing 110,120 and may be fixed to the housing 110,120.
The rotor 135 may be placed outside of the stator 131 in a diameter-wise direction of the stator 131 and may rotate around the stator 131. That is, the motor 130 of the embodiment in the form of an outer rotor-type motor may be driven in the way that the rotor 135 outside of the stator 131 rotates around the stator 131.
The fixed scroll 140 may be accommodated in the accommodation space of the housing 110,120, specifically, in the compression part (B). The fixed scroll 140 may be placed closer to the discharge port 120a than to the motor 130 placed in the motor part (A). That is, the fixed scroll 140 may be placed near the right bottom 121 of the housing 110,120.
The orbiting scroll module 150 may be placed between the motor 130 and the fixed scroll 140. The orbiting scroll module 150 may comprise an orbiting scroll 160. The orbiting scroll 160 may be engaged with the fixed scroll 140 and may form a compression chamber.
The orbiting scroll module 150 comprising the above-described orbiting scroll 160 may be configured to directly connect with the rotor 135 and to orbit by rotations of the rotor 135. Description in relation to this is provided hereunder.
In the scroll compressor 100 with the above-described configuration, refrigerants may be introduced into the scroll compressor 100 through the inlet port 110a. The introduced refrigerants may pass through the motor part (A), move toward the rotor 135, and then pass through the rotor 125 to be introduced to the compression part (B). The refrigerants introduced into the compression part (B) may be introduced into the compression chamber in which the orbiting scroll 160 and the fixed scroll 140 are engaged, and then may be compressed. The high-pressure refrigerants compressed in the compression chamber may be discharged out of the scroll compressor 100 through the discharge port 120a.
A housing 110,120 may comprise a first housing 110 and a second housing 120 which may be separately provided and may be connected to each other.
The first housing 110 and the second housing 120 may be distinguished in a length-wise direction of the housing 110, 120. In the embodiment, as an example, the first housing 110 may be placed on the left side of the housing 110,120, and the second housing 120 may be placed on the right side of the housing 110, 120. As another example, the first housing 110 may be placed on the right side of the housing 110, 120, and the second housing 120 may be placed on the left side of the housing 110, 120 on the basis of positions of the motor 130, the fixed scroll 140, and the orbiting scroll module 150.
According to the embodiment, the first housing 110 may occupy most of the area of the housing 110,120. The first housing 110 may be formed in the shape of an approximately lying cylinder. The first housing 110 may comprise an accommodation space, and the motor part (A) may occupy most of the area of the accommodation space formed in the first housing 110.
The left bottom 111 of the housing 110, 120 may be placed on one side, i.e., on the left side of the first housing 110 in a length-wise direction of the first housing 110. An opening may be formed on the other side, i.e., on the right side of the first housing 110 in the length-wise direction of the first housing 110. That is, the first housing 110 may comprise an accommodation space and may have the shape of a lying cylinder with its right side open. Additionally, an inlet port 110a may also be formed on the first housing 110.
The second housing 120 may be placed on the other side, i.e., on the right side of the first housing 110 in the length-wise direction of the first housing 110. The second housing 120 may be coupled to the open right side of the first housing 110 and may cover the opening. Most of the area of the accommodation space formed in the second housing 120 coupled to the first housing 110 may be occupied by the compression part (B).
Additionally, the right bottom 121 of the housing 110,120 may be placed on the other side, i.e., on the right side of the second housing 120 in a length-wise direction of the second housing 120. Further, a discharge port 120a may be formed on the second housing 120.
The second housing 120 may comprise a cover 121 and a coupler 125.
The cover 121 configured to cover the opening may have the shape of a circular plate including a circular shape corresponding to the shape of the opening. The cover 121 may form the right bottom 121 of the housing 110, 120. The discharge port 120a may be formed on the cover 121.
The coupler 125 may be configured to form a surface parallel to the outer circumferential surface of the first housing 110. The coupler 125 may be formed in the way that extends from the rim of the cover 121 in a direction parallel to the outer circumferential surface of the first housing 110. The coupler 125 formed as described above may be coupled to the other side of the first housing 110 in the length-wise direction of the first housing 110, i.e., the right side of the first housing 110, on which the opening is formed, and may couple the cover 121 to the first housing 110.
In conclusion, the housing 110,120 may be formed in the way the first housing 110 on the left side of the housing 110,120 and the second housing 120 on the right side of the housing 110,120 may be coupled to each other. The housing 110,120 formed as described above may accommodate components such as the motor 130, the orbiting scroll module 150, and the fixed scroll 140, which constitute the scroll compressor 100, in the accommodation space.
The housing 110,120 may be comprised of the first housing 110 and the second housing 120 that may be detachable. Accordingly, components such as the motor 130, and the orbiting scroll module 150 may be installed in the first housing 110 in the state in which the first housing 110 and the second housing 120 are separated. Then the first housing 110 and the second housing 120 may be coupled. Thus, the scroll compressor 100 may be readily assembled.
As described below, the fixed scroll 140 may be provided on the second housing 120. Accordingly, the housing 110,120 may be assembled and the fixed scroll 140 may be installed by simply coupling the second housing 120 to the first housing 110, at a time.
Referring to
According to the embodiment, a supporter 115 may be provided in the housing 110,120. The supporter 115 may be interposed between the inlet port 110a and the discharge port 120a, may be fixed at one side of the first housing 110 in the length-wise direction of the first housing 110, and finally, may be fixed onto the housing 110,120.
As an example, the supporter 115 may be formed in the shape of a lying cylinder with one side in a length-wise direction of thereof fixed to the left bottom 111 of the first housing 110. That is, the supporter 115 may have the shape of a lying cylinder extending from the left bottom 111 of the first housing 110 in the length-wise direction of the housing 110,120. The supporter 115 may be placed at the center of rotation of the motor 130, specifically, the rotor 135.
The stator 131 may be fixed onto the outer surface of the above-described supporter 115 in a circumferential direction of the supporter 115. That is, the stator 131 may be inserted into and coupled to the supporter 115 and may be fixed into the housing 110,120 through a center hole formed in the stator 131. A coil may be fixed to the stator 131 in a concentrated winding manner.
The motor 130 in the form of an outer rotor-type motor according to the embodiment may be provided with the rotor 135 placed outside of the stator 131 in a diameter-wise direction of the stator 131. The rotor 135 may be configured to rotate around the stator 131 outside of the stator 131 and may comprise a skirt 136 and a rotation surface 137.
The skirt 136 may be configured to wrap the outer sides of the stator 131 in the diameter-wise direction of the stator 131. As an example, the skirt 136 may be formed in the shape of a pipe having a center hole, and may be placed at the outer sides of the stator 131 in the diameter-wise direction of the stator 131. A plurality of magnets 138 may be placed in a circumference direction of the skirt 136 on the inner circumferential surface of the skirt 136, which may face the stator 131.
The rotation surface 137 may be placed closer to the orbiting scroll module 150 than to the skirt 136. The rotation surface 137 may form a flat surface that faces the orbiting scroll module 150, and may connect with the skirt 136.
For example, the rotor 135 may have a shape in which the rotation surface 137, formed in the shape of a circular plate, and the skirt 136, formed in the shape of a pipe having a center hole, are connected, i.e., a lying cylinder shape which has a space therein with one side in a length-wise direction thereof opened. The rotor 135 may be formed in the way that the skirt 136 and the rotation surface 137 rotate integrally at the outer sides of the stator 131. The below-described orbiting scroll module 150 may directly connect with the rotation surface 137 of the rotor 135 configured to rotate as described above, and may orbit by rotations of the rotor 135.
The rotor 135 may be rotatably coupled to the supporter 115 and may be rotatably supported inside the housing 110,120. To this end, a main bearing 180 may be provided between the rotor 135 and the supporter 115. The main bearing 180 may be installed on the rotor 135 and may be coupled to the supporter 115 such that the rotor 135 is rotatably supported by the supporter 115.
The rotation surface 137 may be provided with a fixation rib 134 in order for the main bearing 180 to be installed in the rotor 135. The main bearing 180 may contact one surface of the rotation surface 137 facing the supporter 115 and may be fixed to the rotation surface 137. Additionally, the fixation rib 134 that wraps the outer surface of the main bearing 180 in a circumferential direction of the main bearing 180 fixed to the rotation surface 137 may protrude from one surface of the rotation surface 137 facing the supporter 115.
That is, three surfaces of the main bearing 180 may be fixed to and installed in the rotor 135 in the state of be wrapped by the rotation surface 137 and the fixation rib 134. Through a shaft-coupling between the main bearing 180 and the supporter 115, the rotor 135 may be rotatably coupled to the supporter 115.
Additionally, the motor 130 may be provided with an eccentric shaft 139. The eccentric shaft 139 may be placed eccentrically with respect to the rotor 135, specifically, the rotation surface 137. An orbiting scroll module 150 may be coupled to the eccentric shaft 139, and the orbiting scroll module 150 that is coupled to the eccentric shaft 139 may be orbited along the eccentric shaft 139. Detailed description in relation to this is provided hereunder.
Referring to
The orbiting head plate 161 may be formed in the shape of an approximately circular plate and may form a flat surface approximately parallel to a flat surface formed by the right bottom 121 or a flat surface formed by the rotation surface 137. Additionally, the orbiting lap 163 may protrude from the orbiting head plate 161 in a thickness-wise direction of the orbiting head plate 161. The orbiting lap 163 may protrude from one surface of the orbiting head plate 161 (right surface of the orbiting head plate in
The orbiting scroll 160 may comprise a suction port 165. The suction port 165 may form a passage for introducing refrigerants, introduced into the scroll compressor 100 through the inlet port 110a, into the compression chamber. The suction port 165 may be penetratedly formed in the orbiting lap 163, and may be placed farther from a central portion of the compression chamber than a below-described exhaust port 145. As another example, the suction port 165 may be formed in the fixed scroll 140 not in the orbiting scroll 160. In this case, the suction port 165 may be penetratedly formed in the fixed lap 143.
The orbiting scroll module 150 may be provided with a coupling groove 162 for coupling the orbiting scroll module 150 to the motor 130. The coupling groove 162 may be concavely formed in a shape corresponding to the shape of the eccentric shaft 139 while concavely formed on one surface of the orbiting head plate 161 (the left surface of the orbiting head plate in
The eccentric shaft 139 may be rotatably inserted into and coupled to the coupling groove 162 formed as described above. Through an insertion-coupling between the coupling groove 162 and the eccentric shaft 139, the orbiting scroll module 150 and the rotor 135 may be rotatably coupled.
A driving bearing 185 may be provided between the orbiting scroll module 150 and the eccentric shaft 139 such that a rotatable coupling between the orbiting scroll module 150 and the rotor 135 may be smoothly performed. The driving bearing 185 may be fixed into the coupling groove 162 and coupled to the eccentric shaft 139. Accordingly, the orbiting scroll module 150 may be rotatably supported by the rotor 135.
Through the coupling between the orbiting scroll module 150 and the rotor 135, the orbiting scroll module 150 may directly connect to the rotor 135 and may receive driving force of the motor 130. That is, unlike an orbiting scroll module in a conventional scroll compressor, which receives driving force of a motor through a crank shaft (5; ref.
Additionally, the rotation surface 137 of the rotor 135 may form a flat surface parallel to the orbiting head plate 161. Accordingly, the orbiting scroll module 150 may be stably coupled to the rotor 135 in the way that the orbiting head plate 161 contacts the rotation surface 137.
That is, through the contact-coupling between the rotation surface 137 and the orbiting head plate 161 as well as the insertion-coupling between the eccentric shaft 139 and the coupling groove 162, the orbiting scroll module 150 may be coupled to the rotor 135 more stably.
The orbiting scroll module 150, as described above, may rotatably connect to the rotor 135. Accordingly, the orbiting scroll 160 may orbit along a trajectory of rotation of the eccentric shaft 139 eccentrically placed. The orbiting scroll module 150 may be provided with a first projection 170 as a structure for blocking self-rotation of the orbiting scroll 160.
The first projection 170 may block self-rotation of the orbiting scroll 160 by interfering with a below-described second projection 175. Structures and operations of the first projection 170 and the second projection 175 are specifically described hereunder.
Additionally, the orbiting scroll module 150 may be provided with a back pressure hole 167. The back pressure hole 167 may be passage that is provided on the orbiting scroll 160 such that some of the refrigerants, introduced into the compression chamber, may be discharged out of the compression chamber.
The back pressure hole 167 may be formed in the shape of a through hole that passes through the orbiting head plate 161 in a thickness-wise direction of the orbiting head plate 161. A passage that discharges some of the refrigerants, introduced into the compression chamber, out of the compression chamber through another passage not through the exhaust port 145 may be formed on the orbiting scroll 160 by the back pressure hole 167.
Further, the orbiting scroll module 150 may further comprise a sealing member 190. The sealing member 190 may be interposed between the orbiting head plate 161 and the rotation surface 137, and may be formed in the way that encircles the back pressure hole 167 from outer sides of the orbiting head plate 161 in a diameter-wise direction of the orbiting head plate 161.
Accordingly, a sealed space (referred to as “back pressure chamber), encircled by the orbiting head plate 161, the rotation surface 137 and the sealing member 190, may be formed between the orbiting scroll 160 and the rotor 135. Refrigerants, discharged through the back pressure hole 167 from the compression chamber, may be introduced into the back pressure chamber that is formed as a sealed space.
The refrigerants introduced into the back pressure chamber through the back pressure hole 167 may serve as a pressure generating source for generating pressure that presses the orbiting scroll 160 against the fixed scroll 140 closely while widening a gap between the orbiting scroll 160 and the rotor 135.
That is, the back pressure hole 167 may be formed in the orbiting scroll 160, and the back pressure chamber may be formed between the orbiting scroll 160 and the rotor 135 by the sealing member 190. Accordingly, the orbiting scroll 160 may be effectively pressed against the fixed scroll 140, and when the orbiting scroll 160 orbits, friction losses, caused by friction between the orbiting scroll 160 and the rotor 135, may be reduced.
A fixed scroll 140 may comprise a fixed head plate 141 and a fixed lap 143. The fixed head plate 141 may be formed in the shape of an approximately circular plate and may form a flat surface approximately parallel to a flat surface formed by the right bottom 121. Additionally, the fixed lap 143 may protrude from the fixed head plate 141 in a thickness-wise direction of the fixed head plate 141. The fixed lap 143 may protrude from one surface of the fixed head plate 141 facing the motor 130 toward the motor 130, may be engaged with the orbiting scroll 160 and may form a compression chamber.
The fixed scroll 140 may comprise an exhaust port 145. The exhaust port 145 may form a passage for discharging refrigerants, introduced into the compression chamber, out of the compression chamber. The exhaust port 145 may be penetratedly formed in the fixed head plate 141, and may be placed closer to a central portion of the compression chamber than the suction port 165.
The exhaust port 145 may connect with the discharge port 120a provided on the right bottom 121 of the second housing 120. Accordingly, high-pressure refrigerants, which are discharged out of the compression chamber through the exhaust port 145 after compressed in the compression chamber, may be discharged out of the scroll compressor 100 through the discharge port 120a.
According to the embodiment, the fixed scroll 140 may be placed on the inner surface of the cover 121 facing the motor 130 or the orbiting scroll module 150 while placed in the accommodation space of the housing 110,120. The discharge port 120a may be formed to connect with the fixed scroll 140 while passing through the cover 121.
The discharge port 120a, formed in the way that passes through the cover 121 at a position in which the discharge port 120a may connect with the exhaust port 145, may connect with the exhaust port 145, and high-pressure refrigerants compressed in the compression chamber may be discharged out of the scroll compressor 100 through the exhaust port 145 and the discharge port 120a.
In the embodiment, as an example, the fixed scroll 140 and the housing 110,120, specifically, the second housing 120 may be integrally formed.
Accordingly, a partial area of the cover 121 of the second housing 120 may become the fixed head plate 141, and the fixed lap 143 may be formed to protrude from the partial area of the cover 121 serving as the fixed head plate 141.
In this case, the exhaust port 145 and the discharge port 120a may all be formed on the cover 121. Considering this, the exhaust port 145 and the discharge port 120a may be finally included in a single hole formed on the cover 121.
Referring to
The first projection 170 may be provided in the orbiting scroll module 150. The first projection 170 may protrude from the orbiting head plate 161 toward the coupler 125. In other words, the first projection 170 may protrude from the outer circumferential surface of the orbiting head plate 161 outward in a diameter-wise direction of the orbiting head plate 161.
The orbiting scroll module 150 may be provided with a plurality of first projections 170. The plurality of first projections 170 may be placed at regular intervals in a circumferential direction of the orbiting head plate 161. That is, the plurality of first projections 170 may be radially placed on the outer side of the orbiting head plate 161, and each first projection 170 may be spaced a certain distance apart from another adjacent first projection 170.
A first insertion groove 171 may be formed between the first projections 170 placed as described above. The first insertion groove 171 may be interposed between two adjacent first projections 170, and may correspond to a concave shape portion that is naturally formed between the first projections 170 because each first projection 170 protrudes from the outer side of the orbiting head plate 161. That is, each first projection 170 and each first insertion groove 171 may be alternately placed in a circumferential direction of the orbiting head plate 161 on the outer circumferential surface of the orbiting head plate 161. The first insertion groove 171 may be provided as an area in which a below-described second projection 175 is inserted between the first projections 170.
The second projection 175 is provided in the housing 110,120, specifically, in the second housing 120. The second projection 175 may protrude in a direction from the inner circumferential surface of the coupler 125 toward a central portion of the coupler 125 in a diameter-wise direction of the coupler 125. In other words, the second projection 175 may protrude in a direction from the inner circumferential surface of the coupler 125 to the orbiting head plate 161.
The second housing 120 may be provided with a plurality of second projections 175. The plurality of second projections 175 may be placed at regular intervals in a circumferential direction of the coupler 125. That is, the plurality of second projections 175 may be radially placed on the inner circumferential surface of the coupler 125, and each second projection 175 may be spaced a certain distance apart from another adjacent second projection 175.
A second insertion groove 176 may be formed between the second projections 175 placed as described above. The second insertion groove 176 may be interposed between two adjacent second projections 175, and may correspond to a concave shape portion that is naturally formed between the second projections 175 because each second projection 175 protrudes from the inner circumferential surface of the coupler 125. That is, each second projection 175 and each second insertion groove 176 may be alternately placed in a circumferential direction of the coupler 125 on the inner circumferential surface of the coupler 125. The second insertion groove 176 may be provided as an area in which the first projection 170 is inserted between the second projections 175.
When the orbiting scroll 160 and the fixed scroll 140 are engaged with each other, the first projection 170 and the second projection 175 may be placed at a position in which a position of the first projection 170 and a position of the second projection 175 in the length-wise direction of the housing 110,120 may overlap each other. In this case, the first projection 170 and the second projection 175 may be placed in the way that a position of the first projection 170 and a position of the second projection 175 in the circumferential direction of the housing 110,120 do not overlap each other. Accordingly, each of the first projections 170 may be inserted into each of the second insertion grooves 176, and each of the second projections 175 may be inserted into each of the first insertion grooves 171.
When the rotor 135 rotates, and accordingly, the orbiting scroll module 150 orbits, the first projection 170 inserted into the second insertion groove 176, as illustrated in
A width of the first projection 170 in the circumferential direction of the orbiting head plate 161 may be narrower than a gap between two adjacent first projections 170. That is, the first projection 170 may have a width narrower than a width of the second insertion groove 176, and the second projection 175 may have a width narrower than a width of the first insertion groove 171. Thus, through the interference between the first projection 170 and the second projection 175, self-rotation of the orbiting scroll 160 may only be blocked, and enough space for the first projection 170 to orbit inside the second insertion groove 176 may be ensured in the second insertion groove 176.
Additionally, each of the second projections 175 may protrude such that a surface of the second projection 175, which contacts the first projection 170, may form a curved surface when the first projection 170 and the second projection 175 interfere with each other.
Further, each of the first insertion grooves 171 may form a concavely curved surface corresponding to the shape of the second projection 175 protruding to form a curved surface, while being concavely formed between two adjacent first projections 170. The shape of the first insertion groove 171 may be formed by connecting surfaces of two adjacent first projections 170, which face each other, in the shape of a curved surface corresponding to the shape of the second projection 175.
As described above, when surfaces of the second projection 175 and the first insertion groove 171, which face each other, are formed in the shape of a curved surface, the first projection 170 and the second projection 175 may keep interfering with each other while smoothly sliding. Accordingly, the orbiting scroll 160 may orbit more smoothly and effectively in the state in which self-rotation of the orbiting scroll 160 is blocked.
Referring to
Specifically, the rotor 135 may comprise the fixation rib 134 that is a component for allowing the rotor 135 to rotate around the stator 131, and the eccentric shaft 139 that is a component for delivering rotational force of the rotor 135 to the orbiting scroll 160 as well as the skirt 136 and the rotation surface 137 that are basic components of the rotor 135. The fixation rib 134 and the eccentric shaft 139 may not be separate from the rotor 135. Rather, the fixation rib 134, the eccentric shaft 139 and the rotor 135 may be integrally formed. That is, the rotor 135, the fixation rib 134, and the eccentric shaft 139 may be formed as a single component.
The orbiting scroll module 150 may comprise a coupling groove 162 that is a component for coupling the orbiting scroll 160 to the eccentric shaft 139, the first projection 170 that is a component for blocking self-rotation of the orbiting scroll 160 as well as the orbiting scroll 160 that is a basic component of the orbiting scroll module 150. The coupling groove 162 and the first projection 170 may not be separate from the orbiting scroll 160. Rather, the coupling groove 162, the first projection 170 and the orbiting scroll 160 may be integrally formed. That is, the orbiting scroll 160 including the coupling groove 162 and the first projection 170 may be formed as a single component.
The integration of the orbiting scroll 160 including the coupling groove 162 and the first projection 170 may be determined based on whether the orbiting scroll 160 including the coupling groove 162 and the first projection 170 may be integrally formed. The shape in which the orbiting scroll 160 and the first projection 170 may be coupled may be a shape that is readily formed into one piece through a process such as casting and the like, considering the shapes of the orbiting scroll 160 and the first projection 170. Accordingly, the orbiting scroll module 150 may have a structure in which the orbiting scroll 160 and the first projection 170 are integrally formed through a process such as casting and the like.
Additionally, the fixed scroll 140 and the second projection 175 may not be separate from the second housing 120. The fixed scroll 140, the second projection 175 and the second housing 120 may be integrally formed. That is, the second housing 120, the fixed scroll 140 and the second projection 175 may be formed as a single component.
The integration of the second housing 120, the fixed scroll 140 and the second projection 175 may also be determined based on whether the second housing 120, the fixed scroll 140 and the second projection 175 may be integrally formed. A shape in which the second housing 120, the fixed scroll 140 and the second projection 175 may be coupled may also be an integrated shape that is readily formed through a process such as casting and the like, considering the shapes of the second housing 120, the fixed scroll 140 and the second projection 175. Accordingly, the second housing 120 may have a structure in which the second housing 120, the fixed scroll 140 and the second projection 175 may be integrally formed through a process such as casting and the like.
Below, the motor 130 provided with the rotor 135 in which the rotor 135, the fixation rib 134 and the eccentric shaft 139 are integrally formed may be referred to as a first component, the orbiting scroll module 150 may be referred to as a second component, and a structure in which the second housing 120, the fixed scroll 140 and the second projection 175 are integrally formed may be referred to as a third component.
According to the embodiment, assembly of main components installed in the motor part (A) and main components installed in the compression part (B) may be mostly completed simply by assembling the first component, the second component, and the third component.
Specifically, assembly of main components installed in the motor part (A) may be completed by inserting the stator 131 into the supporter 115 and by fixing the first component to the accommodation space of the housing 110, 120. Additionally, assembly of main components installed in the compression part (B) may be completed simply by inserting the eccentric shaft 139 into the coupling groove 162 and coupling the orbiting scroll module 150 to the rotor 135, and by coupling the second housing 120 to the first housing 110 to engage the orbiting scroll 160 with the fixed scroll 140 and to engage the first projection 170 with the second projection 175.
That is, components of the motor part (A) and the compression part (B) may be installed quickly and readily by assembling the first housing 110 and the first component, coupling the second component to the first component, and then coupling the third component to the first housing 110.
Additionally, each of the components, specifically, the second component and the third component may be easily formed through a process such as casting and the like. Thus, the components may be readily manufactured and costs of manufacturing the components may be reduced. Further, through integration of the components, the number of components required for manufacturing the scroll compressor 100 may be reduced. Thus, man-hours spent on assembling the components may be reduced, and the components may be managed easily and efficiently.
Below, operations and effects of the scroll compressor according to the embodiment are described.
The scroll compressor of the embodiment differs from a conventional scroll compressor in the configuration of a motor and the absence of a main frame.
The conventional scroll compressor, as illustrated in
Additionally, the conventional scroll compressor is provided with the driving motor 4, i.e., an interior rotor-type motor in which a stator 41 is placed outside of the motor and in which a rotor 42 is placed inside the stator 41. A crank shaft 5 is used to deliver driving force of the driving motor 4 to an orbiting scroll 3. In order for the crank shaft 5 to connect with the orbiting scroll 3, the crank shaft 5 is required to pass through the main frame 6 that blocks between the driving motor 4 and the orbiting scroll 3.
Accordingly, a shaft seal for sealing the circumference of the crank shaft 5 is installed in the portion through which the crank shaft 5 passes. In this case, friction losses caused by friction between the installed shaft seal and the crank shaft 5 increases.
Further, the size of the scroll compressor increases because the main frame 6 is placed inside the scroll compressor. Further, a bearing and the like are added to rotatably support the crank shaft 5 in the portion in which the crank shaft 5 passes through the main frame 6. As a result, the number of components and the size of the scroll compressor are increased.
Furthermore, the conventional scroll compressor is provided with a sub frame 8 in addition to the main frame 6 to stably support the crank shaft 5. Accordingly, a bearing and the like are added to rotatably support the crank shaft 5 in the portion in which the crank shaft 5 passes through the sub frame 8. As a result, the number of components and the size of the scroll compressor are increased.
Unlike the conventional scroll compressor, the scroll compressor 100 of the embodiment, as illustrated in
Additionally, the motor 130 and the orbiting scroll 160 may not be connected by a crank shaft. The orbiting scroll 160 may be directly connected to the rotor 135 of the motor 130. That is, driving force of the motor 130 may not be delivered by the crank shaft. The driving force of the motor 130 may be directly delivered by the rotor 135 directly connected with the orbiting scroll 160.
Accordingly, the scroll compressor 100 of the embodiment may not require a shaft seal for sealing the circumference of a crank shaft in the portion through which the crank shaft passes, and may not require a bearing and the like for rotatably supporting the crank shaft in the portion through which the crank shaft passes.
As a result, the scroll compressor 100 of the embodiment may cause no increase in friction losses resulting from friction between a shaft seal and a crank shaft, no increase in the number of components resulting from the installation of a crank shaft, and no increase in the size of the scroll compressor.
That is, a structure in which the orbiting scroll 160 is directly connected with the rotor 135 of the outer rotor-type motor 130 to deliver driving force may be applied to the scroll compressor 100 of the embodiment. The scroll compressor 100 may exclude a crank shaft and components in relation to the crank shaft. Accordingly, the scroll compressor 100 may be manufactured using a small number of components with enhanced efficiency and may be compact.
In the above-described structure in which the orbiting scroll 160 is directly connected with the rotor 135 of the outer rotor-type motor 130, the rotation surface 137 of the rotor 135, which is coupled to the orbiting scroll 160 in the way that the rotation surface 137 contacts the orbiting scroll 160, may function as the main frame of the conventional scroll compressor.
In the accommodation space of the scroll compressor 100 of the embodiment, the rotation surface 137 of the rotor 135 may be placed at a boundary between the motor part (A) and the compression part (B). The rotation surface 137 of the rotor 135 may serve as a wall that crosses between the motor part (A) and the compression part (B).
That is, according to the scroll compressor 100 of the embodiment, the rotor 135 of the motor 130 may function as a wall that separates a suction space of refrigerants from a discharge space of refrigerants while crossing between the motor part (A) and the compression part (B). Accordingly, the scroll compressor 100 may not require an additional component such as the main frame of a conventional scroll compressor.
The scroll compressor 100 of the embodiment may be scaled down because a space occupied by a main frame is excluded, thereby making it possible to provide a scroll compressor more compact than a conventional one.
The present disclosure has been described with reference to the embodiments illustrated in the drawings. However, the embodiments are provided only as examples. It will be apparent to one having ordinary skill in the art that the embodiments are intended to cover various modifications and equivalents of the disclosure. Thus, the technical scope of the present disclosure should be defined by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2019-0014115 | Feb 2019 | KR | national |
application claims the benefit of priority under 35 U.S.C. § 119(a) to Korean Patent Application No. 10-2019-0014115, filed in Korea on Feb. 1, 2019, the disclosure of which is incorporated by reference herein in its entirety.
