COMPRESSOR

Abstract

A compressor including a shell; a first scroll and a second scroll positioned in the shell, the first scroll having a first end plate and a first wrap extending from the first end plate toward the second scroll, the second scroll having a second end plate and a second wrap extending from the second end plate toward the first scroll, the first wrap and the second wrap being engaged with each other to define a compression chamber therebetween, the second end plate of the second scroll further having a mounting hub portion extending in a direction away from the first scroll; a driving mechanism positioned on a side of the second scroll away from the first scroll in the shell and configured for driving the first scroll to rotate about a first rotation center, such that the first scroll drives the second scroll to rotate about a second rotation center; and a shaft positioned in the shell and fixedly mounted in the compressor, one end of the shaft being provided with a first hole in which the mounting hub portion is accommodated.

Description

TECHNICAL FIELD

The present disclosure relates to a compressor, and more specifically, to a compressor with higher reliability and higher performance.

BACKGROUND

In a co-rotating scroll compressor, a strict size requirement for processing workpiece and an accurate assembling process are usually needed to ensure sealing between scrolls. Due to the limitation of process level, the manufacturing cost of the scroll compressor is high, the leakage amount is large, and the efficiency of the compressor is low.

SUMMARY

Embodiments of the present disclosure are aimed to solve one or more of the abovementioned technical problems.

According to one aspect of the present disclosure, there is provided a compressor. The compressor includes: a shell; first and second scrolls positioned in the shell, the first scroll having a first end plate and a first wrap extending from the first end plate toward the second scroll, the second scroll having a second end plate and a second wrap extending from the second end plate toward the first scroll, the first wrap and the second wrap being engaged with each other to define a compression chamber therebetween, the second end plate of the second scroll further having a mounting hub portion extending in a direction away from the first scroll; a driving mechanism positioned on a side of the second scroll away from the first scroll in the shell, and configured for driving the first scroll to rotate about a first rotation center, such that the first scroll drives the second scroll to rotate about a second rotation center; and a shaft positioned in the shell and fixedly mounted in the compressor, one end of the shaft being provided with a first hole in which the mounting hub portion is accommodated.

According to one aspect of the present disclosure, the compressor further includes: a first sleeve being accommodated in the first hole and configured for accommodating the mounting hub portion therein.

According to one aspect of the present disclosure, the compressor further includes: a first bearing provided between the first sleeve and the mounting hub portion, wherein an outer diameter of the first sleeve is smaller than an inner diameter of the first hole.

According to one aspect of the present disclosure, the shaft is further provided with a second hole positioned in a side wall of the first hole and communicating with the first hole; an outer wall of the first sleeve is provided with a driving part in a radial direction; and the second hole is fitted with the driving part.

According to one aspect of the present disclosure, the compressor further includes: a pin accommodated in the second hole; wherein the driving part of the first sleeve is a driving surface for abutting against the pin.

According to one aspect of the present disclosure, the driving part of the first sleeve is a protrusion extending outward in the radial direction of the first sleeve and configured for fitting into the second hole.

According to one aspect of the present disclosure, the driving surface is flat or has a curved shape.

According to one aspect of the present disclosure, the rotation center of the first scroll and the rotation center of the second scroll do not coincide with each other in an axial direction.

According to one aspect of the present disclosure, the shaft is further provided with a passage, which is in fluid communication with the first hole and configured for accommodating a pump rod and supplying oil pumped by the pump rod, one end of the pump rod is positioned in an oil sump at the bottom of the shell, the other end of the pump rod is connected to the mounting hub portion, wherein a cross section of the passage has an inner diameter smaller than the inner diameter of the first hole.

According to one aspect of the present disclosure, a first geometric center corresponding to an outer diameter of the side wall of the first hole coincides with the rotation center of the first scroll in the axial direction, and a second geometric center corresponding to an inner diameter of the cross section of the passage coincides with the rotation center of the second scroll in the axial direction.

According to one aspect of the present disclosure, a circumferential position of the second hole along the side wall of the shaft is determined by an angle between a line connecting the second hole and the second geometric center and a line connecting the first geometric center and the second geometric center.

According to one aspect of the present disclosure, the shaft is further provided with a third hole positioned in the side wall of the shaft and extending from a top of the side wall to the oil sump in the axial direction and a fourth hole positioned in the side wall of the shaft and extending from the first hole to the outside of the side wall in the radial direction.

According to one aspect of the present disclosure, the compressor further includes: a frame fixed to the shell at the side of the second scroll away from the first scroll; wherein the shaft is fixed to the frame.

According to one aspect of the present disclosure, the driving mechanism includes: the driving mechanism comprises:

• • an accommodating hub portion comprising opposite first and second ends and rotatably mounted on the shaft so that the driving mechanism is rotatably mounted onto the frame; and a first flange portion radially extending outward from the first end, wherein the driving mechanism is provided with an inner hole extending through the accommodating hub portion and the first flange portion and is connected with the first scroll through the first flange portion, and wherein the second end plate of the second scroll is rotatably supported on the first flange portion.

According to one aspect of the present disclosure, the compressor further includes: a second bearing through which the first end is mounted on the shaft; and a third bearing through which the second end is mounted on the shaft.

According to one aspect of the present disclosure, the shaft has a first step portion, a hole wall of the inner hole of the accommodating hub portion has a second step portion facing the first step portion, and the scroll compressor further includes a fourth bearing provided between the first step portion and the second step portion.

According to one aspect of the present disclosure, the frame includes: a second sleeve, and a second flange portion radially extending from the second sleeve of the frame, and the second end is supported on the second flange portion of the frame.

According to one aspect of the present disclosure, the shaft is accommodated in the accommodating hub portion, such that one end of the shaft being provided with the first hole is flush with an upper surface of the first flange portion and the other end of the shaft extends out of the accommodating hub portion so as to be inserted and fixed in the second sleeve of the frame.

According to one aspect of the present disclosure, the compressor further includes: a motor including: a stator fixed to the frame, and a rotor connected to the accommodating hub portion of the driving mechanism by interference fit, so as to drive the driving mechanism and thus the first scroll to rotate.

According to one aspect of the present disclosure, the compressor further includes: a bushing positioned between the side wall of the inner hole of the first flange portion and the outer wall of the first hole of the shaft, the second bearing being provided inside of the bushing.

According to one aspect of the present disclosure, the bushing includes: a cylindrical body, and a fixing portion provided on an outer circumferential surface of the cylindrical body and fitted with the side wall of the inner hole of the first flange portion.

According to one aspect of the present disclosure, the motor is an axial-flux motor.

According to one aspect of the present disclosure, the first sleeve is made of at least one of a sintered material, a metallic material and a composite material.

According to one aspect of the present disclosure, the first sleeve has a Rockwell hardness of greater than or equal to 15.

According to one aspect of the present disclosure, the bushing has a Rockwell hardness of greater than or equal to 15.

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred embodiments of the present disclosure will now be described by way of examples with reference to the accompanying drawings, in which:

FIG. 1 is a cross section view of a compressor according to an embodiment of the present disclosure.

FIG. 2 is a partial exploded view of the compressor shown in FIG. 1.

FIG. 3 is an enlarged view of some components of the compressor shown in FIG. 2.

FIG. 4 is a top view of a shaft shown in FIG. 2 according to an embodiment of the present disclosure.

FIG. 5 is a cross section view of the shaft shown in FIG. 2 according to an embodiment of the present disclosure.

FIG. 6 is a cross section view of the shaft shown in FIG. 2 fitted with a pin, a first sleeve and a first bearing according to an embodiment of the present disclosure.

FIG. 7 is a perspective view of a shaft according to another embodiment of the present disclosure.

FIG. 8 is a perspective view of a shaft according to a yet another embodiment of the present disclosure.

DETAILED DESCRIPTION

Technical solutions of the present disclosure will be further explained by these embodiments with reference to the accompanying drawings. In the description, the same or similar reference numerals refer to the same or similar components. The following description of the embodiments of the present disclosure with reference to the accompanying drawings is intended to explain the overall inventive idea of the present disclosure and should not be understood as a limitation to the present disclosure.

Further, in the following detailed description, many specific details are elaborated to provide a comprehensive understanding of these embodiments of the present disclosure. However, it is obvious that one or more embodiments can also be implemented without these specific details. In other cases, well-known structures and devices are illustrated schematically to simplify the accompanying drawings.

Referring to FIG. 1 to FIG. 8, a compressor 1000 is provided and includes a shell 200, and a first scroll 10, a second scroll 20, a driving mechanism 100, a motor 90, a shaft 40, and a frame 80 positioned in the shell 200.

The first scroll 10 has a first end plate 11 and a first wrap 12 extending from the first end plate 11 toward the second scroll 20. The second scroll 20 has a second end plate 21 and a second wrap 22 extending from the second end plate 21 toward the first scroll 10. The first wrap 12 and the second wrap 22 are engaged with each other to define a compression chamber 30 therebetween. The compression chamber 30 is used to compress the fluid entering the compression chamber 30 when relative rotation occurs between the first scroll 10 and the second scroll 20. The second end plate 21 of the second scroll 20 further has a mounting hub portion 23 that extends in a direction away from the first scroll 10.

The frame 80 is fixedly mounted on the shell 200 on a side of the second scroll 20 away from the first scroll 10. A shaft 40 is fixedly mounted on the frame 80 in the compressor 1000. One end of the shaft 40 is provided with a first hole 41, and a mounting hub portion 23 is accommodated in the first hole 41 in a manner of clearance fit, thus allowing the radial movement of the second scroll 20 during rotation. During operation of the compressor, a force exerted on the second scroll by gas force is decomposed by a pin, according to an angle a between B-B and O1-O2, into a radial force that causes snug fitting of wrap walls and a tangential force that produces a tangential torque. Due to the presence of the clearance fit and the radial force obtained by decomposition of the force, the wrap wall of the second scroll can be continuously and snugly fitted to the wrap wall of the first scroll to ensure good sealing performance. At the same time, fracture or damage of the second scroll 20 resulting from the second scroll 20 abutting against the shaft 40 and suffering large stress for a long time when impurities enter the compression chamber will be avoided, which improves the efficiency and reliability of the compressor 1000.

The driving mechanism 100 is positioned on a side of the second scroll 20 away from the first scroll 10, for driving a rotation of the first scroll 10 about a first rotation center, and a rotation of the second scroll 20 about a second rotation center is driven by the first scroll 10. The driving mechanism 100 includes an accommodating hub portion 102 and a first flange portion 101. The accommodating hub portion 102 includes opposite first and second ends and is rotatably mounted on the shaft 40 so that the driving mechanism 100 is rotatably mounted onto the frame 80. The first flange portion 101 radially extends outward from the first end. The driving mechanism 100 is provided with an inner hole extending through the accommodating hub portion 102 and the first flange portion 101 and is connected with the first scroll 10 through the first flange portion 101, and the second end plate 21 of the second scroll 20 is rotatably supported on the first flange portion 101.

In this embodiment, the motor 90 is an axial-flux motor, however, it may also be any other suitable type of motor. The motor 90 includes: a rotor 91, and a stator 92 fixed to the frame 80, and the rotor 91 fits in an interference manner to the accommodating hub portion 102 of the driving mechanism 100, so as to drive the rotation of the first scroll 10 by driving the driving mechanism 100.

A first sleeve 50 is accommodated in the first hole 41 and configured for accommodating the mounting hub portion 23 in a clearance fit manner. The first sleeve 50 is made of at least one of sintered material, metallic material and composite material, so that the first sleeve 50 has a Rockwell hardness of greater than or equal to 15 and has good wear resistance. An outer diameter of the first sleeve 50 is smaller than an inner diameter R1 of the first hole 41 to allow a radial movement of the second scroll 20 during rotation. A first bearing 70 (i.e., rolling bearing) is provided between the first sleeve 50 and the mounting hub portion 23. The first end of the accommodating hub portion 102 is mounted on the shaft 40 through a second bearing 121, and the second end of the accommodating hub portion 102 is mounted on the shaft 40 through a third bearing 300 (see FIG. 1).

A bushing 120 is positioned between a side wall of the inner hole of the first flange portion 101 and an outer wall of the first hole 41 of the shaft 40, and the second bearing 121 is provided on an inner side of the bushing 120. The bushing 120 is made of cast iron, power metal, steel, other alloys or other polymer materials, such that the bushing 120 has a Rockwell hardness of greater than or equal to 15, and has good wear resistance. The bushing 120 includes a cylindrical body 122, and a fixing portion 123 provided on an outer circumferential surface of the cylindrical body 122 and configured for being connected in a fitting manner with the side wall of the inner hole of the first flange portion 101. In FIG. 2, the fixing portion 123 is shown as a plurality of projections separated from each other along the outer circumferential surface of the cylindrical body 122, however this is not limitative. The fixing portion 123 may also be provided as a recess that fits with the side wall of the inner hole of the first flange portion 101.

The frame 80 includes: a second sleeve 81, and a second flange portion 82 radially extending from the second sleeve 81 of the frame 80, and the second end is supported on the second flange portion 82 of the frame 80 (see FIG. 1).

Referring to FIG. 1, the shaft 40 is accommodated in the accommodating hub portion 102, such that one end 45 of the shaft 40 being provided with the first hole 41 is flush with an upper surface of the first flange portion 101. And the other end 46 of the shaft 40 may extend out of the accommodating hub portion 102 so as to be inserted and fixed in the second sleeve 81 of the frame 80. The other end 46 may be fixed onto the second sleeve 81 through interference fit (see FIG. 7) or threaded engagement (see FIG. 8).

The shaft 40 is further provided with a second hole 42 positioned in a side wall 411 of the first hole 41 and communicating with the first hole 41. An outer wall of the first sleeve 50 is provided with a driving part 51 in a radial direction. The second hole 42 is fitted with the driving part 51, as shown in FIGS. 3 to 6. A pin 60 is accommodated in the second hole 42. As shown in FIG. 3, the driving part 51 of the first sleeve 50 is a driving surface which is flat or which has a curved shape for abutting against the pin 60. Thus, the first sleeve 50 can only move within a limited scope, but not rotate. Meanwhile, this also facilitates the transfer of the force of the fluid (in this case the gas) in the compressor 1000 through the pin 60 and the first sleeve 50 to the shaft 40 so as to mount the pin 60 in the second hole 42. The number of the second holes 42 may be one (see FIGS. 3 to 6) or multiple (for example, two, see FIGS. 7 and 8), that is, the desired number of the second holes 42 may be set as needed to use one or more pins 60 to act on the first sleeve 50.

In another exemplary embodiment, the driving part 51 of the first sleeve 50 may be provided as a protrusion extending outward in the radial direction of the first sleeve 50 and configured for fitting into the second hole 42.

A rotation center of the first scroll 10 and a rotation center of the second scroll 20 do not coincide with each other in an axial direction. That is, the rotation axis extending axially through the rotation center of the first scroll 10 and the rotation axis extending axially through the rotation center of the second scroll 20 are parallel to and separate from each other, as described below by referring to FIG. 4. This facilitates the first scroll 10 and the second scroll 20 balancing the centrifugal force generated by each other during rotation, thereby avoiding the provision of a balance block to balance the centrifugal force generated by the rotations of the scrolls 10 and 20. As a result, the structure of the compressor 1000 is simplified and the volume of the compressor 1000 is reduced.

The shaft 40 is further provided with a passage 43, which is in fluid communication with the first hole 41 and configured for accommodating a pump rod 431 and supplying oil pumped by the pump rod 431. One end of the pump rod 431 is positioned in an oil sump at the bottom of the shell 200, the other end of the pump rod 431 is connected to the mounting hub portion 23 (see FIG. 1). A cross section of the passage 43 has an inner diameter R2 smaller than the inner diameter R1 of the first hole 41. Referring to FIG. 4, in order to more clearly show the geometric centers O1 and O2, in FIG. 4, an intersection of dotted lines A-A and B-B is defined as O1, and an intersection of dotted lines A-A and C-C is defined as O2. The first geometric center O1 corresponding to the outer diameter R3 of the side wall 411 of the first hole 41 coincides with the rotation center of the first scroll 10 in the axial direction. And, the second geometric center O2 corresponding to the inner diameter of the cross section of the passage 43 coincides with the rotation center of the second scroll 20 in the axial direction, as can be seen in FIG. 4. The geometric center O1 of profile of the shaft 40 deviates from the geometric center O2 of the passage 43 in the shaft 40. This structurally ensures a deviation between the rotation center of the first scroll 10 and the rotation center of the second scroll 20. Further referring to FIG. 4, the passage 43 and the first hole 41 have the same geometric center O2.

For the sake of description, a circumferential position of the second hole 42 along the side wall 411 of the shaft 40 is determined by an angle a between a line connecting the second hole 42 and the second geometric center O2 and a line connecting the first geometric center O1 and the second geometric center O2, the angle a being in the range of 0° to 360°. During the compression, gas pressure acts on the scrolls 10 and 20. As a result, the mounting hub portion 23 of the second scroll 20 indirectly abuts against the pin 60 in the second hole 42 through the first sleeve 50. The pin 60 exerts a reaction force through the first sleeve 50 to the mounting hub portion 23 and the second scroll 20, thereby improving the sealing between the scrolls 10 and 20. The size of the angle a determines the radial and tangential components of the reaction force exerted by pin 60 on mounting hub portion 23. Values of the radial and tangential components of the force exerted by the pin 60 on the mounting hub portion 23 may be adjusted by adjusting the angle a during design, so as to optimize the sealing between the scrolls 10 and 20.

The shaft 40 is further provided with a third hole 44 positioned in the side wall 411 of the shaft 41. The third hole 44 is in fluid communication with the passage 43 and extends axially in the side wall 411 of the shaft 41 from a top of the side wall 411 to the oil sump, so that excess oil pumped by the pump rod 431 in the passage 43 or oil that has lubricated other components is returned to the oil sump at the bottom of the shell 200 through the third hole 44. The shaft 40 is further provided with a fourth hole 48 positioned in the side wall 411 of the shaft 40 and extending radially from the first hole 41 to the outside of the side wall 411, so that some of the oil pumped by the pump rod 431 flows out of the fourth hole 48 to lubricate the relevant components of the compressor 1000.

The shaft 40 has a first step portion 47, a hole wall of an inner hole of the accommodating hub portion 102 has a second step portion 211 facing the first step portion 47, and a fourth bearing 400 (namely a thrust bearing) is provided between the first step portion 47 and the second step portion 211.

Referring to FIG. 1, in this embodiment, the bearings 70, 121, 300 and 400 are all positioned on the side of the second scroll 20 away from the first scroll 10, simplifying and optimizing the structure of the compressor 1000.

Those skilled in the art may understand that the embodiments described above are exemplary and can be modified by those skilled in the art, and that the structures described in various embodiments can be freely combined without conflict of structure or principle.

After specifying the preferred embodiments of the present disclosure, it is clear to those skilled in the art that variations and modifications may be made without leaving the scope and spirit of protection of the claims, and that the present disclosure is not limited to these exemplary embodiments presented in the description.

Claims

1. A compressor, comprising: a shell;first and second scrolls positioned in the shell, the first scroll having a first end plate and a first wrap extending from the first end plate toward the second scroll, the second scroll having a second end plate and a second wrap extending from the second end plate toward the first scroll, the first wrap and the second wrap being engaged with each other to define a compression chamber therebetween, the second end plate of the second scroll further having a mounting hub portion extending in a direction away from the first scroll;a driving mechanism positioned on a side of the second scroll away from the first scroll in the shell, and configured for driving the first scroll to rotate about a first rotation center, such that the first scroll drives the second scroll to rotate about a second rotation center; anda shaft positioned in the shell and fixedly mounted in the compressor, one end of the shaft being provided with a first hole in which the mounting hub portion is accommodated.

2. The compressor according to claim 1, further comprising: a first sleeve being accommodated in the first hole and configured for accommodating the mounting hub portion therein.

3. The compressor according to claim 2, further comprising: a first bearing provided between the first sleeve and the mounting hub portion, wherein an outer diameter of the first sleeve is smaller than an inner diameter of the first hole.

4. The compressor according to claim 2, wherein: the shaft is further provided with a second hole positioned in a side wall of the first hole and communicating with the first hole;an outer wall of the first sleeve is provided with a driving part in a radial direction; and the second hole is fitted with the driving part.

5. The compressor according to claim 4, further comprising: a pin accommodated in the second hole; wherein the driving part of the first sleeve is a driving surface for abutting against the pin.

6. The compressor according to claim 4, wherein: the driving part of the first sleeve is a protrusion extending outward in the radial direction of the first sleeve and configured for fitting into the second hole.

7. The compressor according to claim 5, wherein: the driving surface is flat or has a curved shape.

8. The compressor according to claim 4, wherein: the rotation center of the first scroll and the rotation center of the second scroll do not coincide with each other in an axial direction.

9. The compressor according to claim 8, wherein: the shaft is further provided with a passage, which is in fluid communication with the first hole and configured for accommodating a pump rod and supplying oil pumped by the pump rod, one end of the pump rod is positioned in an oil sump at the bottom of the shell, the other end of the pump rod is connected to the mounting hub portion, wherein a cross section of the passage has an inner diameter smaller than the inner diameter of the first hole.

10. The compressor according to claim 9, wherein: a first geometric center corresponding to an outer diameter of the side wall of the first hole coincides with the rotation center of the first scroll in the axial direction, and a second geometric center corresponding to an inner diameter of the cross section of the passage coincides with the rotation center of the second scroll in the axial direction.

11. The compressor according to claim 10, wherein: a circumferential position of the second hole along the side wall of the shaft is determined by an angle between a line connecting the second hole and the second geometric center and a line connecting the first geometric center and the second geometric center.

12. The compressor according to claim 9, wherein: the shaft is further provided with a third hole positioned in the side wall of the shaft and extending axially from a top of the side wall to the oil sump and a fourth hole positioned in the side wall of the shaft and extending radially from the first hole to the outside of the side wall.

13. The compressor according to claim 1, further comprising: a frame fixed to the shell at the side of the second scroll away from the first scroll;wherein the shaft is fixed to the frame.

14. The compressor according to claim 13, wherein: the driving mechanism comprises:an accommodating hub portion comprising opposite first and second ends and being rotatably mounted on the shaft so that the driving mechanism is rotatably mounted onto the frame; anda first flange portion radially extending outward from the first end,wherein the driving mechanism is provided with an inner hole extending through the accommodating hub portion and the first flange portion, and is connected with the first scroll through the first flange portion, and wherein the second end plate of the second scroll is rotatably supported on the first flange portion.

15. The compressor according to claim 14, further comprising: a second bearing through which the first end is mounted on the shaft; anda third bearing through which the second end is mounted on the shaft.

16. The compressor according to claim 14, wherein: the shaft has a first step portion,a hole wall of the inner hole of the accommodating hub portion has a second step portion facing the first step portion, andthe scroll compressor further comprises a fourth bearing provided between the first step portion and the second step portion.

17. The scroll compressor according to claim 14, wherein: the frame comprises: a second sleeve and a second flange portion radially extending from the second sleeve of the frame, and the second end is supported on the second flange portion of the frame.

18. The scroll compressor according to claim 17, wherein: the shaft is accommodated in the accommodating hub portion, such that one end of the shaft being provided with the first hole is flush with an upper surface of the first flange portion and the other end of the shaft extends out of the accommodating hub portion so as to be inserted and fixed in the second sleeve of the frame.

19. The compressor according to claim 14, further comprising: a motor comprising: a stator fixed to the frame, and a rotor connected to the accommodating hub portion of the driving mechanism by interference fit, so as to drive the driving mechanism and thus the first scroll to rotate.

20. The compressor according to claim 15, further comprising: a bushing positioned between the side wall of the inner hole of the first flange portion and the outer wall of the first hole of the shaft, the second bearing being provided inside the bushing.

21. The compressor according to claim 20, wherein the bushing comprises: a cylindrical body, anda fixing portion provided on an outer circumferential surface of the cylindrical body and fitted with the side wall of the inner hole of the first flange portion.

22. The compressor according to claim 19, wherein: the motor is an axial-flux motor.

23. The compressor according to claim 2, wherein: the first sleeve is made of at least one of a sintered material, a metallic material and a composite material.

24. The compressor according to claim 2, wherein: the first sleeve has a Rockwell hardness of greater than or equal to 15.

25. The compressor according to claim 20, wherein: the bushing has a Rockwell hardness of greater than or equal to 15.