Patent Application
20190178249
The present invention relates to a co-rotating scroll compressor.
Hitherto, a co-rotating scroll compressor is known (see PTL 1). The co-rotating scroll compressor includes a driving-side scroll and a driven-side scroll that rotates together with and in synchronization with the driving-side scroll. The co-rotating scroll compressor rotates the driving shaft and the driven shaft in the same direction at the same angular velocity by offsetting a driven shaft that supports the rotation of the driven-side scroll from a driving shaft that rotates the driving-side scroll by the turning radius.
An outer peripheral ring portion is provided on the driven-side scroll in PTL 1, and this outer peripheral annular block portion has a shape that surrounds the outer periphery of the driven scroll. The outer peripheral annular block portion is advantage in that the rigidity of the driven scroll is enhanced and the deformation of an end plate is suppressed, but it becomes difficult to respond to high acceleration because the rotation inertia force increases.
The present invention has been made in view of the situation as above, and an object thereof is to provide a co-rotating scroll compressor that enables speed up and high acceleration.
In order to solve the abovementioned problem, a co-rotating scroll compressor of the present invention employs the following solutions.
That is, a co-rotating scroll compressor according to an aspect of the present invention includes: a driving-side scroll member driven by a drive unit so as to rotate, and including a plurality of spiral driving-side walls provided about a center of a driving-side end plate at predetermined angular intervals; a driven-side scroll member including spiral driven-side walls, the driven-side walls being provided about a center of a driven-side end plate at predetermined angular intervals and in a number corresponding to the driving-side walls, the driven-side walls being engaged with the corresponding driving-side walls so as to form a compression space; a synchronous driving mechanism that transmits driving force from the driving-side scroll member to the driven-side scroll member so that the driving-side scroll member and the driven-side scroll member rotationally move in a same direction at a same angular velocity; and a driving-side supporting member arranged across the driven-side end plate, fixed to a distal end side of the driving-side walls in an rotation direction, and rotated together with the driving-side scroll member, and/or a driven-side supporting member arranged across the driving-side end plate, fixed to a distal end side of the driven-side walls in an rotation direction, and rotated together with the driven-side scroll member, in which a fixing portion of each of the driving-side walls to which the driving-side supporting member is fixed is provided in a position close to a radially outside end portion of the driving-side wall and separated from the radially outside end portion in an inner circumferential direction of the driving-side wall, and/or a fixing portion of each of the driven-side walls to which the driven-side supporting member is fixed is provided in a position close to a radially outside end portion of the driven-side wall and separated from the radially outside end portion in an inner circumferential direction of the driven-side wall.
The driving-side walls arranged about the center of the end plate of the driving-side scroll member at predetermined angular intervals and the corresponding driven-side walls of the driven-side scroll member are engaged with each other. As a result, a plurality of pairs each formed by one driving-side wall and one driven-side are provided, and the scroll-type compressor including a plurality of lines of walls is formed. The driving-side scroll member is driven by the drive unit so as to rotate, and the driving force transmitted to the driving-side scroll member is transmitted to the driven-side scroll member via the synchronous driving mechanism. As a result, the driven-side scroll member rotationally moves in the same direction at the same angular velocity as the driving-side scroll member while rotating. As described above, the co-rotating scroll compressor in which both of the driving-side scroll member and the driven-side scroll member rotate is provided.
When the driving-side scroll member and the driven-side scroll member rotates and the number of revolutions increases, the distal ends of the walls provided on the end plates in the rotation axis direction are displaced to a radially outside place by centrifugal force, and the walls are deformed so as to be inclined. The radially outside end portions of the walls are in positions farthest from the centers of the end plates, and hence the centrifugal force becomes the largest. Therefore, the deformation of the walls becomes the largest at the radially outside end portions. Thus, by fixing the supporting members on the free end side of the walls, the rigidity of the walls is increased and the speed up can be responded to.
The fixing portions of the walls to which the supporting members are fixed has higher rigidity as compared to other regions of the walls. Therefore, it is conceived to be preferred that the fixing portions be provided on the radially outside end portions of the walls subjected to the largest centrifugal force. However, as a result of keen examination by the inventors and the like, it has been found that, when the fixing portions are provided on the radially outside end portions, the rigidity becomes higher but the stress caused by the centrifugal force increases on the contrary because the mass of the fixing portions becomes larger than the other wall regions. Thus, the fixing portions are provided in positions close to the radially outside end portions of the walls and separated from the radially outside end portions in the inner circumferential direction of the walls. As a result, as compared to a case where the fixing portions are placed on the radially outside end portions, the stress generated on the fixing portions can be reduced, and hence the speed up and the high acceleration can be responded to.
Further, in the co-rotating scroll compressor according to an aspect of the present invention, an angle formed by a line connecting a center of the driving-side wall and the radially outside end portion to each other and a line connecting the center of the driving-side wall and a middle of the fixing portion to each other is 10° or more and 50° or less when the driving-side wall is seen in planar view; and/or an angle formed by a line connecting a center of the driven-side wall and the radially outside end portion to each other and a line connecting the center of the driven-side wall and a middle of the fixing portion to each other is 10° or more and 50° or less when the driven-side wall is seen in planar view.
As the position close to the radially outside end portion of the wall in which the fixing portion is provided, the angle formed by the line connecting the center of the wall and the radially outside end portion to each other and the line connecting the center of the wall and the middle of the fixing portion to each other is preferably 10° or more and 50° or less.
Further, in the co-rotating scroll compressor according to an aspect of the present invention, the driving-side scroll member includes: a first driving-side scroll portion including a first driving-side end plate and a first driving-side wall, the first driving-side scroll portion being driven by the drive unit; a second driving-side scroll member including a second driving-side end plate and a second driving-side wall; and a wall fixing portion that performs fixing in a state in which distal ends of the first driving-side wall and the second driving-side wall in a rotation axis direction face each other; the driven-side scroll member includes: a first driven-side wall provided on one side surface of the driven-side end plate, the first driven-side wall being engaged with the first driving-side wall; and a second driven-side wall provided on another side surface of the driven-side end plate, the second driven-side wall being engaged with the second driving-side wall; and the driven-side supporting member includes: a first supporting member arranged across the first driving-side end plate, fixed on a distal end side of the first driven-side wall in a rotation axis direction, and rotated together with the first driven-side wall; and a second supporting member arranged across the second driving-side end plate, fixed to a distal end side of the second driven-side wall in a rotation axis direction, and rotated together with the second driven-side wall.
By engaging the first driving-side wall and the first driven-side wall with each other and engaging the second driving-side wall and the second driven-side wall with each other, the compression spaces are formed on both side surfaces of the driven-side end plate. Further, by providing the first supporting member fixed to the first driven-side wall and the second supporting member fixed to the second driven-side wall, the rigidity of the walls is increased. Further, as described above, the fixing portion is provided in a position close to the radially outside end portion of the wall and separated from the radially outside end portion in the inner circumferential direction of the wall. As a result, as compared to a case where the fixing portion is placed on the radially outside end portion, the weight increase can be suppressed and the stress generated on the fixing portion can be reduced. Therefore, the speed up and the high acceleration can be responded to.
The fixing portion of the wall to which the supporting member is fixed is provided in a position close to the radially outside end portion of the wall and separated from the radially outside end portion in the inner circumferential direction of the wall. As a result, as compared to a case where the fixing portion is placed on the radially outside end portion, the stress generated on the fixing portion can be reduced, and hence the speed up and the high acceleration can be responded to.
Embodiments according to the present invention are described below with reference to the drawings.
A first embodiment of the present invention is described below with reference to
The co-rotating scroll compressor 1A includes a housing 3, and a driving-side scroll member 7 and the driven-side scroll member 9 accommodated in the other end side of the housing 3.
The housing 3 has a substantially cylindrical shape, and has one end (not shown) on which a motor accommodation portion that accommodates a drive unit such as an electric motor is provided. As illustrated in
The rotational driving force from a rotor of the motor is transmitted to a driving-side shaft portion 7c of the driving-side scroll member 7 that rotates about a driving rotational axis CL1.
The driving-side scroll member 7 includes a driving-side end plate 7a, and a spiral driving-side wall 7b provided on one side of the driving-side end plate 7a. The driving-side end plate 7a is connected to the driving-side shaft portion 7c connected to a driving shaft 6, and extends in a direction orthogonal to the driving-side rotational axis CL1. The driving-side shaft portion 7c is provided so as to be rotatable with respect to the housing 3 via a driving-side bearing 11 that is a ball bearing.
The driving-side end plate 7a has a substantially disk-like shape when seen in planar view. As illustrated in
Driving-side fixing portions 7f for fixing a driving-side supporting member 20 described below is provided near the radially outside end portions 7e of the driving-side walls 7b. The driving-side fixing portion 7f is a bulging portion obtained by increasing the board thickness of the driving-side wall 7b radially outward. The forming position of the driving-side fixing portion 7f is a position separated from the radially outside end portion 7e in the inner circumferential direction (winding starting direction) of the driving-side wall 7b. Specifically, an angle θ formed by the line connecting the driving-side rotational axis CL1 and the radially outside end portion 7e to each other and the line connecting the driving-side rotational axis CL1 and the middle of the driving-side fixing portion 7f (more specifically, the center of a fastening member 24a) to each other is 10° or more and 50° or less.
As illustrated in
The driven-side end plate 9a has a substantially disk-like shape when seen in planar view. As illustrated in
Driven-side fixing portions 9f for fixing a driven-side supporting member 22 described below is provided near the radially outside end portions 9e of the driven-side walls 9b. The driven-side fixing portion 9f is a bulging portion obtained by increasing the board thickness of the driven-side wall 9b radially outward. The forming position of the driven-side fixing portion 9f is a position separated from the radially outside end portion 9e in the inner circumferential direction (winding starting direction) of the driven-side wall 9b. Specifically, an angle θ formed by the line connecting the driven-side rotational axis CL2 and the radially outside end portion 9e to each other and the line connecting the driven-side rotational axis CL2 and the middle of the driven-side fixing portion 9f (more specifically, the center of a fastening member 24b) to each other is 10° or more and 50° or less.
As described above, as illustrated in
As illustrated in
The driving-side supporting member 20 includes a shaft portion 20a on the center side. The shaft portion 20a is rotatably attached with respect to the housing 3 via a bearing 26 for the driving-side supporting member that is a ball bearing. As a result, the driving-side supporting member 20 rotates about the driving-side rotational axis CL1 as with the driving-side scroll member 7.
As illustrated in
As illustrated in
As illustrated in
The driven-side supporting member 22 includes a shaft portion 22a on the center side. The shaft portion 22a is rotatably attached with respect to the housing 3 via a bearing 28 for the driven-side supporting member that is a ball bearing. As a result, the driven-side supporting member 22 rotates about the driven-side rotational axis CL2 as with the driven-side scroll member 9.
As illustrated in
As illustrated in
The co-rotating scroll compressor 1A having the abovementioned configuration operates as follows.
When the driving shaft is rotated about the driving-side rotational axis CL1 by the motor, the driving-side shaft portion 7c connected to the driving shaft also rotates. As a result, the driving-side scroll member 7 rotates about the driving-side rotational axis CL1. When the driving-side scroll member 7 rotates, the driving force is transmitted from the driving-side end plate 7a to the driven-side supporting member 22 via the pin ring mechanism 15. Further, the driving force is transmitted from the driving-side supporting member 20 to the driven-side end plate 9a via the pin ring mechanism 15. As a result, the driving force is transmitted to the driven-side scroll member 9, and the driven-side scroll member 9 rotates about the driven-side rotational axis CL2. At this time, the pin member 15b of the pin ring mechanism 15 moves while being in contact with the ring member 15a, and hence both of the scroll members 7 and 9 rotationally move in the same direction at the same angular velocity.
When both of the scroll members 7 and 9 rotationally move in the same direction at the same angular velocity, the air sucked from the suction opening in the housing 3 is sucked from the outer periphery side of both of the scroll members 7 and 9, and is taken into the compression chamber formed by both of the scroll members 7 and 9. The capacity of the compression chamber decreases as the compression chamber approaches the center side, and air is compressed accordingly. The air compressed as above flows through the exhaust port 9d in the driven-side scroll member 9 and is exhausted to the outside from the exhaust opening 3d in the housing 3. The exhausted compressed air is guided to an internal combustion engine (not shown) and is used as combustion air.
The effects of this embodiment is as follows.
When the driving-side scroll member 7 and the driven-side scroll member 9 rotate and the number of revolutions increases, the distal ends of the walls 7b and 9b provided on the end plates 7a and 9a in the rotation axis direction are displaced to a radially outside place by centrifugal force, and the walls 7b and 9b are deformed so as to be inclined. The radially outside end portions 7e and 9e of the walls 7b and 9b are in positions farthest from the centers CL1 and CL2 of the end plates, and hence the centrifugal force becomes the largest. Therefore, the deformation of the walls 7b and 9b becomes the largest at the radially outside end portions 7e and 9e. Thus, by fixing the supporting members 20 and 22 on the free end side of the walls 7b and 9b, the rigidity of the walls 7b and 9b is increased and the speed up can be responded to.
The fixing portions 7f and 9f of the walls 7b and 9b to which the supporting members 20 and 22 are fixed have higher rigidity as compared to other regions of the walls 7b and 9b. Therefore, it is conceived to be preferred that the fixing portions 7f and 9f be provided on the radially outside end portions 7e and 9e of the walls 7b and 9b subjected to the largest centrifugal force. However, as a result of keen examination by the inventors and the like, it has been found that, when the fixing portions 7f and 9f are provided on the radially outside end portions 7e and 9e, the rigidity becomes higher but the stress caused by the centrifugal force increases on the contrary because the mass of the fixing portions 7f and 9f becomes larger than the other wall regions. Thus, the fixing portions 7f and 9f are provided in positions close to the radially outside end portions 7e and 9e of the walls 7b and 9b and separated from the radially outside end portions 7e and 9e in the inner circumferential direction of the walls 7b and 9b. As a result, as compared to a case where the fixing portions 7f and 9f are placed on the radially outside end portions 7e and 9e, the stress generated on the fixing portions 7f and 9f can be reduced, and hence the speed up and the high acceleration can be responded to. For example, the speed up of 10000 rotations per minute or more, preferably 15000 rotations or more can be responded to, and high acceleration that reaches to 10000 rotations in 0.5 seconds at the time of start-up can be responded to.
The arrangement and the structure of the fixing portions 7f and 9f described in the first embodiment can be also applied to a co-rotating scroll compressor described below.
As illustrated in
The first driving-side scroll portion 71 includes a first driving-side end plate 71a and a first driving-side wall 71b. Three lines of first driving-side walls 71b are provided as with the abovementioned driving-side walls 7b (see
The second driving-side scroll portion 72 includes a second driving-side end plate 72a and a second driving-side wall 72b. Three lines of second driving-side walls 72b are provided as with the abovementioned driving-side walls 7b (see
The first driving-side scroll portion 71 and the second driving-side scroll portion 72 are fixed in a state in which the distal ends (free ends) of the walls 71b and 72b are facing each other. The first driving-side scroll portion 71 and the second driving-side scroll portion 72 are fixed by a bolt (wall fixing portion) 31 fastened with respect to flange parts 73 provided in a plurality of places so as to protrude radially outward.
The driven-side scroll member 90 includes a driven-side end plate 90a provided in substantially the middle in the axial direction (the horizontal direction in
Driven-side walls 91b and 92b are provided on both sides of the driven-side end plate 90a. The first driven-side wall 91b provided from the driven-side end plate 90a to the motor side is engaged with the first driving-side wall 71b of the first driving-side scroll portion 71, and the second driven-side wall 92b provided from the driven-side end plate 90a to the exhaust opening 3d side is engaged with the second driving-side wall 72b of the second driving-side scroll portion 72.
A first supporting member 33 and a second supporting member 35 are provided on both ends of the driven-side scroll member 90 in the axial direction (the horizontal direction in
A shaft portion 33a is provided on the central axis side of the first supporting member 33, and the shaft portion 33a is fixed to the housing 3 via a bearing 37 for the first supporting member. A shaft portion 35a is provided on the central axis side of the second supporting member 35, and the shaft portion 35a is fixed to the housing 3 via a bearing 38 for the second supporting member. As a result, the driven-side scroll member 90 is rotated about the second center axis CL2 via the supporting members 33 and 35. Further, the shapes of the supporting members 33 and 35 are similar to that of the driven-side supporting member 22 in the first embodiment described with reference to
The pin ring mechanism 15 is provided between the first supporting member 33 and the first driving-side end plate 71a. That is, the ring member 15a is provided in the first driving-side end plate 71a, and the pin member 15b is provided in the first supporting member 33. As illustrated in
The pin ring mechanism 15 is provided between the second supporting member 35 and the second driving-side end plate 72a. That is, the ring member 15a is provided in the second driving-side end plate 72a, and the pin member 15b is provided in the second supporting member 35. As illustrated in
The scroll accommodation portion 3b of the housing 3 is divided at the substantially middle portion of the scroll members 70 and 90 in the axial direction, and fixed by a bolt 32.
The co-rotating scroll compressor 1B having the abovementioned configuration operates as follows.
When the driving shaft connected to a rotor is rotated about the driving-side rotational axis CL1 by a motor, the driving-side shaft portion 7c connected to the driving shaft also rotates. As a result, the driving-side scroll member 70 rotates about the driving-side rotational axis CL1. When the driving-side scroll member 70 rotates, the driving force is transmitted from the supporting members 33 and 35 to the driven-side scroll member 90 via the pin ring mechanism 15, and the driven-side scroll member 90 rotates about the driven-side rotational axis CL2. At this time, the pin member 15b of the pin ring mechanism 15 moves while being in contact with the ring member 15a, and hence both of the scroll members 70 and 90 rotationally move in the same direction at the same angular velocity.
When both of the scroll members 70 and 90 rotationally move in the same direction at the same angular velocity, the air sucked from the suction opening in the housing 3 is sucked from the outer periphery side of both of the scroll members 70 and 90, and is taken into the compression chamber formed by both of the scroll members 70 and 90. Further, the compression chamber formed by the first driving-side wall 71b and the first driven-side wall 91b and the compression chamber formed by the second driving-side wall 72b and the second driven-side wall 92b are separately compressed. The capacity of the compression chambers decreases as the compression chambers approach the center side, and the air is compressed accordingly. The air compressed by the first driving-side wall 71b and the first driven-side wall 91b flows through a through hole 90h formed in the driven-side end plate 90a, and is merged with air compressed by the second driving-side wall 72b and the second driven-side wall 92b. The merged air flows through the exhaust port 72d and is exhausted to the outside from the exhaust opening 3d in the housing 3. The exhausted compressed air is guided to an internal combustion engine (not shown) and is used as combustion air.
Also in the co-rotating scroll compressor 1B of this embodiment, as with the first embodiment, the fixing portions 91f and 92f are provided in places separated from the radially outside end portions of the driven-side walls 91b and 92b in the inner circumferential direction, and hence the stress generated on the fixing portions 91f and 92f can be reduced. As a result, the speed up and the high acceleration can be responded to.
Note that, in the abovementioned embodiments, the co-rotating scroll compressor is used as the supercharger, but the present invention is not limited thereto, and the co-rotating scroll compressor can be widely used as long as fluid is compressed. For example, the co-rotating scroll compressor can be used as a refrigerant compressor used in an air conditioning unit.
Further, as a “predetermined angular interval” by which the three lines of walls are separated about the center of the end plate, an equiangular interval that is 120° is preferred, but the present invention is not limited thereto. The angle tolerance for the equiangular interval is ±10°, and the interval may preferably be a substantially equiangular interval of which angle tolerance is ±1°.
Further, the pin ring mechanism 15 is used as a synchronous driving mechanism, but the present invention is not limited thereto, and the pin ring mechanism 15 may be used as a crank pin mechanism, for example.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2016-151542 | Aug 2016 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2017/027944 | 8/1/2017 | WO | 00 |
