Rotation prevention mechanism and scroll compressor

Abstract

A rotation prevention mechanism (30) comprises: a plurality of fixed pieces (31) that are fixed to a housing (40) side of a compressor and are disposed at intervals in the circumferential direction relative to an axis; movable pieces (32) that are respectively provided between the plurality of fixed pieces and are fixed to an orbiting scroll; a main body (33) that is disposed in a region surrounded by the fixed pieces and the movable pieces; and a plurality of elastic parts (34) that connect the main body with the fixed pieces and the movable pieces. The fixed pieces (31), the movable pieces (32), the main body (33), and the elastic parts (34) are all disposed in one plane orthogonal to the axis.

Description

Rotation prevention mechanism and scroll compressor

[0001] This application claims priority to Japanese Patent Application No. 2024-028527, filed on February 28, 2024, the contents of which are incorporated herein by reference.

[0002] Scroll compressors are widely used as devices for compressing refrigerants in air conditioners. A scroll compressor primarily comprises a fixed scroll fixed to a housing and an orbiting scroll that meshes with the fixed scroll to form a compression chamber between them. The fixed scroll and the orbiting scroll are provided with spiral wraps. As the orbiting scroll orbits, or revolves, around its axis, the volume of the compression chamber between the wraps changes over time. This allows the refrigerant in the compression chamber to be compressed.

[0003] In this device, the orbiting scroll orbits around its axis while its rotation around the axis is restricted. Oldham rings and pin rings have been used as mechanisms to prevent rotation. However, these mechanisms have many sliding parts, and therefore require costs for ensuring a lubricant supply path and wear prevention measures. Therefore, as described in Patent Document 1 below, an anti-rotation mechanism that replaces the Oldham ring has been proposed. In the device described in Patent Document 1 below, the driven shaft on the orbiting scroll side and the main shaft on the fixed scroll side are connected by an annular leaf spring. It is said that the elastic deformation of the leaf spring prevents the driven shaft from rotating around its axis while allowing the orbiting motion.

[0004] Japanese Patent Application Laid-Open No. 2008-255795

[0005] However, the mechanism disclosed in Patent Document 1 has a large number of parts and is large in axial dimension, which complicates the manufacturing process of the compressor and hinders downsizing.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an anti-rotation mechanism and a scroll compressor that can be manufactured more easily and are further miniaturized.

[0007] In order to solve the above-mentioned problems, the rotation prevention mechanism of the present disclosure is a rotation prevention mechanism that is provided alongside a fixed scroll that forms a compression chamber of a scroll compressor and a revolving scroll that can revolve around an axis relative to the fixed scroll, and that prevents the revolving scroll from rotating on its own axis, and includes a plurality of fixed pieces that are fixed to the housing side of the compressor and arranged at intervals in the circumferential direction about the axis, movable pieces that are provided between the plurality of fixed pieces and fixed to the revolving scroll, a main body portion that is arranged in an area surrounded by the fixed pieces and the movable pieces, and a plurality of elastic portions that connect the fixed pieces and the movable pieces to the main body portion, and the fixed pieces, the movable pieces, the main body portion, and the elastic portions are arranged in the same plane that is perpendicular to the axis.

[0008] A scroll compressor according to the present disclosure includes the above-described rotation prevention mechanism, the fixed scroll, the orbiting scroll, and an electric motor that orbits the orbiting scroll.

[0009] According to the present disclosure, it is possible to provide an anti-rotation mechanism and a scroll compressor that can be manufactured more easily and are further miniaturized.

[0010] FIG. 1 is a cross-sectional view showing the configuration of a scroll compressor according to a first embodiment of the present disclosure. FIG. 2 is a plan view showing the configuration of an anti-rotation mechanism according to a first embodiment of the present disclosure. FIG. 3 is a plan view showing a state in which the anti-rotation mechanism according to the first embodiment of the present disclosure is operating. FIG. 4 is a plan view showing a state in which the orbiting scroll has further orbited from the state of FIG. 3. FIG. 5 is an explanatory view showing the configuration and load direction of the anti-rotation mechanism according to the first embodiment of the present disclosure. FIG. 6 is a schematic view showing the configuration of an anti-rotation mechanism according to a second embodiment of the present disclosure. FIG. 7 is a schematic view showing modified examples of the anti-rotation mechanism according to each embodiment of the present disclosure.

[0011] First Embodiment A scroll compressor 1 and a rotation prevention mechanism 30 according to a first embodiment of the present disclosure will be described below with reference to Fig. 1 to Fig. 5. The scroll compressor 1 is preferably installed in an air conditioning system for a vehicle or a house, for example, and is used to compress a refrigerant.

[0012] (Overall Configuration of Scroll Compressor) As shown in Fig. 1 , the scroll compressor 1 includes a drive unit 10, a compression unit 20, a rotation prevention mechanism 30, and a housing 40. The drive unit 10 drives the compression unit 20. The rotation prevention mechanism 30 is provided to prevent rotation of an orbiting scroll 22 (described later). The housing 40 is a housing that houses the drive unit 10, the compression unit 20, and the rotation prevention mechanism 30.

[0013] (Configuration of the drive unit) The drive unit 10 includes an electric motor 11, a rotating shaft 12, a bearing unit 13, and a counterweight 14. The electric motor 11 includes a stator 51 and a rotor 52. The stator 51 incorporates a plurality of coils. The stator 51 is cylindrical and has a main axis X as its center. The rotor 52 is disposed on the inner periphery of the stator 51. The rotor 52 extends along the main axis X and is supported so as to be rotatable about the main axis X. The rotor 52 incorporates a permanent magnet. When current is supplied to the stator coil, a rotational torque is applied to the rotor 52 by an electromagnetic force generated between the coil and the permanent magnet. This causes the rotor 52 to rotate about the main axis X.

[0014] The rotary shaft 12 is integrally connected to the output shaft of the rotor 52. The rotary shaft 12 is rod-shaped and extends along the main axis X. The ends of the rotary shaft 12 are rotatably supported by an upper bearing 53 and a lower bearing 54, which serve as bearing units 13. The bearing units 13 are, for example, journal bearings or roller bearings, and are capable of bearing a load in the radial direction relative to the main axis X.

[0015] An eccentric shaft 15 is integrally provided on one end of the rotating shaft 12. The eccentric shaft 15 extends along a secondary axis Y that is radially displaced from the primary axis X and extends parallel to the primary axis X. Therefore, when the rotating shaft 12 rotates, the eccentric shaft 15 revolves (revolves) around the primary axis X. A counterweight 14 is attached to one end of the rotating shaft 12. The counterweight 14 is a weight that is located on the opposite side of the eccentric direction of the eccentric shaft 15. The counterweight 14 can offset the centrifugal force generated when the eccentric shaft 15 revolves.

[0016] (Configuration of Compression Unit) The compression unit 20 is provided on one side of the drive unit 10 in the direction of the main axis X. The compression unit 20 has a fixed scroll 21 and an orbiting scroll 22. The fixed scroll 21 is fixed inside the housing 40. The fixed scroll 21 has a fixed end plate 61, a fixed wrap 62, and a discharge portion 63. The fixed end plate 61 is disk-shaped and centered on the main axis X. A fixed wrap 62 is integrally formed on the surface of the fixed end plate 61 on the other side in the direction of the main axis X (i.e., the side facing the drive unit 10). The fixed wrap 62 is a spiral plate centered on the main axis X. In addition, a discharge portion 63 is provided in the center of the fixed end plate 61 for discharging high-pressure refrigerant flowing out of a compression chamber (described later) into the housing 40.

[0017] The orbiting scroll 22 has an orbiting end plate 71, an orbiting wrap 72, and a boss portion 73. The orbiting end plate 71 is supported by the eccentric shaft 15. The orbiting end plate 71 faces the fixed scroll 21 in the direction of the main axis X. An orbiting wrap 72 is integrally formed on the surface of the orbiting end plate 71 facing the fixed scroll 21. The orbiting wrap 72 is formed of a spiral plate, similar to the fixed wrap 62. The orbiting wrap 72 meshes with the fixed wrap 62 to form a compression chamber therebetween. When the orbiting scroll 22 orbits integrally with the eccentric shaft 15, the volume of the compression chamber changes over time. This allows the low-pressure refrigerant introduced into the compression chamber to be compressed, generating high-pressure refrigerant. The boss portion 73 is provided on the surface of the orbiting end plate 71 opposite the orbiting wrap 72. The eccentric shaft 15 is inserted into the boss portion 73 via a drive bush 15a and a bearing 15b. Specifically, the bearing 15b is inserted into the inner periphery of the boss portion 73, and the drive bush 15a, into which the eccentric shaft 15 is fitted, is disposed inside the bearing 15b. The central axis of the drive bush 15a and the orbiting scroll 22 is the orbital axis Z.

[0018] (Configuration of Rotation Prevention Mechanism) Here, the orbiting scroll 22 needs to be restricted from rotating while orbiting about the main axis X. To achieve this operation, the rotation prevention mechanism 30 is provided. The rotation prevention mechanism 30 is provided between the orbiting end plate 71 of the orbiting scroll 22 and a thrust block 80 fixed to the housing 40. The thrust block 80 is provided to support the load in the direction of the main axis X from the compression section 20. It is also possible to configure the rotation prevention mechanism 30 to be provided between the orbiting end plate 71 and the housing 40, assuming that it will also be used to support the thrust load. In that case, the thrust block 80 will be unnecessary.

[0019] As shown in FIG. 2 , the rotation prevention mechanism 30 has a plurality (pairs) of fixed pieces 31 , a plurality (pairs) of movable pieces 32 , a main body portion 33 , and an elastic portion 34 .

[0020] The fixed piece 31 is fixed to the thrust block 80 with bolts or the like (not shown). The heads of the bolts fastening the fixed piece 31 to the thrust block 80, and the movable piece 32 to the orbiting scroll 22, respectively, are flush with the surfaces of the fixed piece 31 and the movable piece 32. The fixed pieces 31 are provided one each at positions spaced apart in the circumferential direction, diametrically, about the main axis X. When viewed from the direction of the main axis X, the fixed piece 31 extends circumferentially, and its outer end face forms an arc shape centered on the main axis X. The inner end face of the fixed piece 31 is flat. Both circumferential end faces of the fixed piece 31 extend radially. The tip of the positioning pin that positions the fixed piece 31 relative to the housing 40 (thrust block 80) does not protrude from the surface of the fixed piece 31.

[0021] The movable pieces 32 are fixed integrally to the orbiting scroll 22. In other words, when the orbiting scroll 22 orbits, the movable pieces 32 are similarly displaced. Each movable piece 32 is disposed in a region between a pair of fixed pieces 31. In other words, the movable pieces 32 and the fixed pieces 31 are arranged alternately at intervals in the circumferential direction. The shape of the movable pieces 32 is, for example, the same as the shape of the fixed pieces 31 described above. Note that the movable pieces 32 and the fixed pieces 31 do not necessarily have to have the same shape.

[0022] The main body 33 is disposed in an area on the inner periphery surrounded by the fixed piece 31 and the movable piece 32. The main body 33 has a parallelogram shape when viewed from the direction of the main axis X. A circular opening 35 is formed in the center of the main body 33 to allow the counterweight 14 or the like to pass through. Of the four corners of the main body 33, a pair of corners whose interior angle is 90 degrees or less are designated "connection points P." The elastic parts 34 are each connected to these connection points P.

[0023] The elastic portion 34 is a leaf spring that connects the fixed piece 31, the movable piece 32, and the main body 33. Specifically, the elastic portion 34 is a leaf spring whose thickness direction is the radial direction relative to the axis. The dimension of the elastic portion 34 in the direction of the main axis X is set smaller than the dimensions of the fixed piece 31, the movable piece 32, and the main body 33 in the direction of the main axis X. The elastic portion 34 has a first elastic portion 91 and a second elastic portion 92. The first elastic portion 91 extends from an end of the fixed piece 31 on the front side in the orbiting direction of the orbiting scroll 22 toward the rear side in the orbiting direction, thereby connecting to a connection point P of the main body 33. The second elastic portion 92 extends from an end of the movable piece 32 on the rear side in the orbiting direction toward the front side in the orbiting direction, thereby connecting to the connection point P. In other words, one first elastic portion 91 and one second elastic portion 92 are connected to each connection point P.

[0024] The anti-rotation mechanism 30 is located in the same plane perpendicular to the main axis X. In other words, when viewed in the radial direction relative to the main axis X, the fixed piece 31, the movable piece 32, the main body 33, and the elastic piece 34 have the same or similar thickness dimensions. Therefore, when manufacturing the anti-rotation mechanism 30, it is possible to integrally form the above-mentioned components by performing a cutting process or the like on a plate-shaped base body made of a single material. It is also possible to manufacture the anti-rotation mechanism 30 by three-dimensional additive manufacturing.

[0025] (Operation and Effect) Here, Oldham rings and pin rings have been used as mechanisms for preventing the orbiting scroll 22 from rotating. However, these mechanisms have many sliding parts, which require costs for ensuring a lubricant supply path and for wear prevention. For this reason, various measures have been proposed to reduce the number of sliding parts. However, these measures all require a large number of parts and increase the dimensions of the mechanism in the direction of the main axis X. This has led to problems such as complicating the manufacturing process of the scroll compressor 1 and hindering miniaturization. To solve this problem, the present embodiment employs the above-described configurations.

[0026] According to the above configuration, a pair of movable pieces 32 are fixed to the orbiting scroll 22, and a pair of fixed pieces 31 are fixed to the fixed scroll 21. As shown in FIGS. 3 and 4 , when torque (counterclockwise torque is used as an example) is applied to the orbiting scroll 22, the orbiting scroll 22 is displaced such that its orbital axis Z orbits around the main axis X. Accordingly, the movable pieces 32 are displaced such that they orbit together with the orbiting scroll 22. However, the movable pieces 32 do not displace relative to the orbiting scroll 22. Because the pair of movable pieces 32 are connected to each other by the orbiting scroll 22, the displacements of these movable pieces 32 are synchronized. In other words, they displace by the same amount at the same time. As a result, the pair of opposing elastic portions 34 (91) are displaced by the same amount in the bending direction and are hardly displaced in the expansion / contraction direction. Therefore, the orbiting scroll 22 performs only one-directional translational motion relative to the main body portion 33 (having only one translational degree of freedom). Similarly, due to the displacement of the elastic portion 34 (92), the main body portion 33 undergoes translational movement in only one direction relative to the housing 40 (having only one translational degree of freedom). Because the displacement directions of the elastic portion 91 and the elastic portion 92 are different, the orbiting scroll 22 has only two translational degrees of freedom relative to the housing 40. In other words, it is possible to orbit the orbiting scroll 22 about its axis while maintaining its posture.

[0027] Furthermore, because the fixed piece 31, the movable piece 32, the main body 33, and the elastic part 34 are arranged in the same plane, it is possible to minimize the dimensions of the anti-rotation mechanism 30 in the axial direction. This allows for further miniaturization of the size and dimensions of the scroll compressor 1. Also, because the anti-rotation mechanism 30 is arranged in the same plane, it can bear the load from the compression part 20 in the direction of the main axis X. This also makes it possible to omit a conventional member called a thrust plate. This allows for a further reduction in the number of parts.

[0028] Furthermore, because these components are arranged on the same plane, it is possible to manufacture the anti-rotation mechanism 30 simply by performing cutting or the like on a single plate-shaped base body. These components can also be formed by three-dimensional additive manufacturing or the like. This simplifies the manufacturing process and reduces the number of parts. Therefore, it is possible to significantly reduce the manufacturing cost and time for the scroll compressor 1, which is the final product.

[0029] According to the above configuration, the elastic portion 34 is a leaf spring whose thickness direction is the radial direction. As a result, the elastic portion 34 is elastically deformed, thereby allowing displacement of the movable piece 32 and the main body portion 33 mainly in the radial direction. This makes it possible to prevent rotation and realize smooth orbiting movement of the orbiting scroll 22.

[0030] As shown in FIG. 5 , when the orbiting scroll 22 orbits, a torque is applied to the fixed piece 31 in the direction opposite to the orbiting direction, and a torque is applied to the movable piece 32 in the orbiting direction. According to the above configuration, the first elastic portion 91 and the second elastic portion 92 are both connected to the same connection point P. As a result, even when the torque is applied, only tensile stress is generated in the first elastic portion 91 and the second elastic portion 92. In other words, no compressive stress is generated in these elastic portions 34. Therefore, the possibility of buckling of these elastic portions 34 can be eliminated. As a result, it is possible to achieve a long life for the rotation prevention mechanism 30 and the scroll compressor 1 employing the same.

[0031] According to the above configuration, an opening 35 is formed in the main body 33, so that other components such as the shaft and counterweight 14 can be placed inside the opening 35 without interfering with the operation of these components.

[0032] According to the above configuration, it is possible to manufacture the rotation prevention mechanism 30 simply by performing cutting or the like on a single plate-shaped base body. Conversely, these components can also be formed by three-dimensional additive manufacturing or the like. This simplifies the manufacturing process and reduces the number of parts. Therefore, it is possible to significantly reduce the manufacturing cost and manufacturing time of the scroll compressor 1, which is the final product.

[0033] According to the above configuration, the head of the bolt is flush with the surfaces of the fixed piece 31 and the movable piece 32, so that the thrust load can be borne uniformly by these surfaces.

[0034] According to the above configuration, the tip of the positioning pin does not protrude from the surface of the fixed piece 31, so that the surface can stably support the thrust load.

[0035] According to the above configuration, the thickness dimension of the elastic portion 34, which is subject to large expansion, contraction, bending, etc., is smaller than that of the other members, so the possibility of snagging or wear during operation can be significantly reduced.

[0036] The first embodiment of the present disclosure has been described above. Note that various changes and modifications can be made to the above-described configurations without departing from the spirit and scope of the present disclosure.

[0037] Second Embodiment Next, a second embodiment of the present disclosure will be described with reference to Fig. 6. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0038] In this embodiment, the configuration of at least one of the movable piece 32 and the fixed piece 31 is different from that of the first embodiment. That is, the rotation prevention mechanism 30 according to this embodiment further includes a stopper portion 93 in addition to the above-described configurations. The stopper portion 93 is provided on at least one of the rear end edge of the fixed piece 31 in the rotation direction and the front end edge of the movable piece 32 in the rotation direction, and protrudes toward the other.

[0039] (Effects) Here, as shown in FIG. 6 , for example, when the scroll compressor 1 is stopped or the rotation speed is reduced, a torque is generated in the orbiting scroll 22 in the direction opposite to the orbiting direction. This torque causes a load to act on the movable piece 32 in a direction that moves it closer to the fixed piece 31. With the above configuration, the stopper portion 93 is provided, thereby reducing the possibility that the movable piece 32 and the fixed piece 31 will come too close to each other. This reduces the risk of compressive stress occurring in the elastic portion 34, and significantly reduces the possibility that the elastic portion 34 will buckle. As a result, the life of the rotation prevention mechanism 30 and the scroll compressor 1 can be further extended.

[0040] (Other Embodiments) Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like within the scope that does not deviate from the gist of the present disclosure are also included.

[0041] For example, as shown as a modified example in Figure 7, it is possible to adopt a configuration in which the connection point P of the elastic portion 34 is different between the first elastic portion 91 and the second elastic portion 92. Even in this case, the above-mentioned rotation prevention effect can be obtained. On the other hand, during turning, compressive stress is also generated in addition to tensile stress in the elastic portion 34. Therefore, from the perspective of reducing the risk of buckling, it is advantageous to adopt the configurations according to the above-mentioned embodiments.

[0042] Furthermore, the number of fixed pieces 31 and movable pieces 32 is merely an example, and it is possible to provide three or more of each. Even in this case, the same effects as those described above can be obtained. Furthermore, the shape of the main body 33 is merely an example, and does not necessarily have to be a parallelogram. Furthermore, if interference with the counterweight 14 or the like can be avoided, there is no need to provide an opening 35 in the main body 33.

[0043] <Additional Notes> The rotation prevention mechanism 30 and the scroll compressor 1 described in each embodiment can be understood, for example, as follows.

[0044] (1) The rotation prevention mechanism 30 according to the first aspect is provided alongside a fixed scroll 21 that forms a compression chamber of a scroll compressor 1 and a revolving scroll 22 that can revolve around an axis relative to the fixed scroll 21, and prevents the revolving scroll 22 from rotating on its axis. The rotation prevention mechanism 30 comprises: a plurality of fixed pieces 31 that are fixed to the housing 40 of the compressor and spaced apart in the circumferential direction relative to the axis; movable pieces 32 that are provided between the plurality of fixed pieces 31 and fixed to the revolving scroll 22; a main body 33 that is arranged in an area surrounded by the fixed pieces 31 and the movable pieces 32; and a plurality of elastic parts 34 that connect the fixed pieces 31 and the movable pieces 32 to the main body 33, and the fixed pieces 31, the movable pieces 32, the main body 33, and the elastic parts 34 are arranged in the same plane that is perpendicular to the axis.

[0045] According to the above configuration, it is possible to rotate the orbiting scroll 22 about its axis while maintaining the orientation of the orbiting scroll 22. Furthermore, since the components are arranged on the same plane, it is possible to manufacture the rotation prevention mechanism 30 simply by performing cutting or the like on a single plate-shaped base body.

[0046] (2) A second aspect of the rotation prevention mechanism 30 is the rotation prevention mechanism 30 of (1), in which the elastic portion 34 is a leaf spring whose thickness direction is the radial direction relative to the axis.

[0047] According to the above configuration, the elastic portion 34 is elastically deformed, thereby allowing displacement of the movable piece 32 and the main body portion 33 mainly in the radial direction.

[0048] (3) The rotation prevention mechanism 30 according to the third aspect is the rotation prevention mechanism 30 of (1) or (2), wherein the elastic portion 34 has a first elastic portion 91 that, when viewed from the axial direction, extends from the end of the fixed piece 31 that is forward in the rotation direction of the orbiting scroll 22 toward the rear side in the rotation direction, and is thereby connected to the connection point P of the main body portion 33, and a second elastic portion 92 that extends from the end of the movable piece 32 that is rear in the rotation direction toward the front side in the rotation direction, and is thereby connected to the connection point P.

[0049] According to the above configuration, only tensile stress is generated in the first elastic portion 91 and the second elastic portion 92. Therefore, the possibility of buckling of these elastic portions 34 can be eliminated.

[0050] (4) The rotation prevention mechanism 30 according to the fourth aspect is the rotation prevention mechanism 30 of (3), and further has a stopper portion 93 provided on at least one of the rear edge of the fixed piece 31 in the rotation direction and the front edge of the movable piece 32 in the rotation direction, and protruding toward the other.

[0051] According to the above configuration, since the stopper portion 93 is provided, it is possible to reduce the possibility that the movable piece 32 and the fixed piece 31 will come too close to each other, thereby making it possible to significantly reduce the possibility that the elastic portion 34 will buckle.

[0052] (5) The fifth aspect of the rotation prevention mechanism 30 is the rotation prevention mechanism 30 according to any one of the aspects (1) to (4), in which the main body 33 has an opening 35 formed therein that opens to surround the axis.

[0053] According to the above configuration, an opening 35 is formed in the main body 33, so that other components such as the shaft and counterweight 14 can be placed inside the opening 35 without interfering with the operation of these components.

[0054] (6) The sixth aspect of the rotation prevention mechanism 30 is the rotation prevention mechanism 30 according to any one of the aspects (1) to (5), in which the fixed piece 31, the movable piece 32, the main body portion 33, and the elastic portion 34 are integrally formed by a single member.

[0055] According to the above configuration, it is possible to manufacture the rotation prevention mechanism 30 simply by performing cutting or the like on a single plate-shaped element, for example, which simplifies the manufacturing process and reduces the number of parts.

[0056] (7) The seventh aspect of the rotation prevention mechanism 30 is the rotation prevention mechanism of (1) or (2), in which the heads of the bolts fastening the fixed piece 31 to the housing 40 side and the movable piece 32 to the orbiting scroll 22 are flush with the surfaces of the fixed piece 31 and the movable piece 32.

[0057] According to the above configuration, the head of the bolt is flush with the surfaces of the fixed piece 31 and the movable piece 32, so that the thrust load can be borne uniformly by these surfaces.

[0058] (8) The rotation prevention mechanism 30 according to the eighth aspect is the rotation prevention mechanism of (1) or (2), in which the tip of the positioning pin that positions the fixed piece 31 relative to the housing 40 does not protrude from the surface of the fixed piece 31.

[0059] According to the above configuration, the tip of the positioning pin does not protrude from the surface of the fixed piece 31, so that the surface can stably support the thrust load.

[0060] (9) The rotation prevention mechanism 30 according to the ninth aspect is the rotation prevention mechanism of (1) or (2), in which the dimension of the elastic portion 34 in the axial direction (main axis X) is smaller than the dimensions of the fixed piece 31, the movable piece 32, and the main body portion 33 in the axial direction.

[0061] According to the above configuration, the thickness dimension of the elastic portion 34, which is subject to large expansion, contraction, bending, etc., is smaller than that of the other members, so the possibility of snagging or wear during operation can be significantly reduced.

[0062] (10) The scroll compressor 1 according to the tenth aspect includes a rotation prevention mechanism 30 according to any one of the aspects (1) to (6), the fixed scroll 21, the orbiting scroll 22, and an electric motor 11 that orbits the orbiting scroll 22.

[0063] According to the above configuration, it is possible to provide a scroll compressor 1 that can be manufactured more easily and is further miniaturized.

[0064] According to the present disclosure, it is possible to provide an anti-rotation mechanism and a scroll compressor that can be manufactured more easily and are further miniaturized.

[0065] DESCRIPTION OF SYMBOLS 1...Scroll compressor 10...Drive unit 11...Motor 12...Rotating shaft 13...Bearing unit 14...Counterweight 15...Eccentric shaft 15a...Drive bush 15b...Bearing 20...Compression unit 21...Fixed scroll 22...Orbiting scroll 30...Rotation prevention mechanism 31...Fixed piece 32...Movable piece 33...Main body unit 34...Elastic unit 35...Opening 40...Housing 51...Stator 52...Rotor 53...Upper bearing 54...Lower bearing 61...Fixed end plate 62...Fixed wrap 63...Discharge unit 71...Orbiting end plate 72...Orbiting wrap 73...Boss unit 80...Thrust block 91...First elastic unit 92...Second elastic unit 93...Stopper unit P...Connection point X...Main axis Y...Sub-axis

Claims

1. A rotation prevention mechanism that is provided alongside a fixed scroll that forms a compression chamber of a scroll compressor, and a revolving scroll that can revolve around an axis relative to the fixed scroll, and that prevents the revolving scroll from rotating on its own axis, comprising: a plurality of fixed pieces that are fixed to the housing side of the scroll compressor and are arranged at intervals in the circumferential direction about the axis; movable pieces that are provided between the plurality of fixed pieces and are fixed to the revolving scroll; a main body that is arranged within an area surrounded by the fixed pieces and the movable pieces; and a plurality of elastic parts that connect the fixed pieces and the movable pieces to the main body, wherein the fixed pieces, the movable pieces, the main body and the elastic parts are arranged in the same plane that is perpendicular to the axis.

2. The rotation prevention mechanism according to claim 1, wherein the elastic portion is a leaf spring whose thickness direction is the radial direction relative to the axis.

3. A rotation prevention mechanism as described in claim 1 or 2, wherein the elastic portion has: a first elastic portion that, when viewed from the axial direction, extends from the end of the fixed piece that is forward in the orbiting direction of the orbiting scroll toward the rear side in the orbiting direction, thereby connecting to the connection point of the main body portion; and a second elastic portion that extends from the end of the movable piece that is rearward in the orbiting direction toward the front side in the orbiting direction, thereby connecting to the connection point.

4. A rotation prevention mechanism as described in claim 3, further comprising a stopper portion provided on at least one of the rear end edge of the fixed piece in the rotation direction and the front end edge of the movable piece in the rotation direction, protruding toward the other end edge.

5. A rotation prevention mechanism according to claim 1 or 2, wherein the main body has an opening formed therein that surrounds the axis.

6. A rotation prevention mechanism according to claim 1 or 2, wherein the fixed piece, the movable piece, the main body, and the elastic part are integrally formed from a single member.

7. A rotation prevention mechanism as described in claim 1 or 2, wherein the heads of the bolts fastening the fixed piece to the housing side and the movable piece to the orbiting scroll are flush with the surfaces of the fixed piece and the movable piece.

8. A rotation prevention mechanism according to claim 1 or 2, wherein the tip of a positioning pin that positions the fixed piece relative to the housing does not protrude from the surface of the fixed piece.

9. A rotation prevention mechanism according to claim 1 or 2, wherein the dimension of the elastic portion in the axial direction is smaller than the dimensions of the fixed piece, the movable piece, and the main body portion in the axial direction.

10. A scroll compressor comprising: the rotation prevention mechanism according to claim 1 or 2; the fixed scroll; the orbiting scroll; and an electric motor for orbiting the orbiting scroll.

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