JP7017256B2 - Scroll type fluid machine - Google Patents

Description

The present invention relates to a scroll fluid machine integrated with an electric motor.

Patent Document 1 (International Publication No. WO2018 / 138795) discloses a motor capable of obtaining high strength in a motor casing and a compressor using the same. This compressor is a cylindrical body that houses a rotating shaft provided rotatably, a rotor that rotates integrally with the rotating shaft, a stator that drives the rotor to rotate, and a rotor and a stator on the outer peripheral surface thereof. , A motor having a motor casing provided with ribs extending in the circumferential direction. This motor is connected to the compression unit via a rotation shaft.

Patent Document 2 (Japanese Unexamined Patent Publication No. 2019-178678) discloses a scroll type electric compressor. In this scroll type electric compressor, an electric motor unit and a compression unit are arranged in a housing, and they are connected to each other via a rotation shaft, and a driving force is transmitted to the compression unit by a rotation shaft rotated by the electric motor unit. It has a structure.

Similar to Patent Document 2, Patent Document 3 (Japanese Unexamined Patent Publication No. 2019-190459) also includes an electric motor unit and a compression unit in a housing, and the electric motor unit and the compression unit are connected via a rotation shaft. Disclose the compressor.

International Publication WO2018 / 138795 Japanese Unexamined Patent Publication No. 2019-178678 Japanese Unexamined Patent Publication No. 2019-190459

For example, as disclosed in Patent Documents 1 to 3 described above, in a scroll type fluid machine incorporating a conventional electric motor and a compressor, the electric motor and the compressor are connected by a rotating shaft, and the rotation thereof is performed. The structure is such that the torque of the electric motor is transmitted to the compressor through the shaft. In this case, the rotating shaft needs to have a predetermined diameter and a predetermined hardness in order to reliably transmit the torque generated by the electric motor to the compressor. For this reason, the rotating shaft is often made of an iron-based material, and it is necessary to increase the shaft diameter in terms of strength, which causes a problem that the weight of the fluid machine itself increases.

Furthermore, in a fluid machine in which the drive scroll and the driven scroll rotate at high speed while turning each other, the smaller the diameter of the bearing to support, the larger the permissible rotation speed and the easier it is to increase the speed. It is desirable to form it in a lightweight material such as aluminum material from the viewpoint of weight reduction.

Therefore, the present invention provides a scroll type fluid machine having a structure that achieves high speed rotation and small size and light weight.

The scroll fluid machine according to the present invention includes a drive scroll member including at least one drive scroll extending in a spiral shape, and a driven scroll that meshes with the drive scroll to define a compressed space. In a scroll fluid machine having a member and a driven scroll member connected via a rotation synchronization mechanism in a housing, a drive unit for rotating the drive scroll member includes a stator fixed in the housing and the drive. It is configured by a rotor fixed to a scroll member.

As a result, since the drive scroll member is directly rotated by the rotor fixed to the drive scroll member, the torque generated in the rotor can be transmitted to the drive scroll member without going through the rotation axis. Since the rotating shaft only supports positioning and its own weight, aluminum material can be used instead of iron-based material even if the diameter is small, so that the weight of the scroll fluid machine can be reduced.

Further, the drive scroll member includes a drive scroll end plate having a communication hole in the center, and first and second drive scrolls that are erected on both sides of the drive scroll end plate and extend radially in a spiral shape. The driven scroll member includes first and second drive scroll receivers that support the outer peripheral ends of the drive scroll end plate from both sides and are rotatably supported by the housing, and the driven scroll member includes the first drive scroll. The central end of the first compressed space through the communication hole of the drive scroll end plate, which meshes with the first driven scroll that meshes to define the first compressed space and the second drive scroll. A second driven scroll that defines a second compressed space communicating with the unit, a first driven scroll end plate on which the first driven scroll stands, and a second driven scroll on which the second driven scroll stands. A discharge hole extending from the central portion of the driven scroll end plate of the first driven scroll end plate to the opposite side of the first driven scroll and communicating with the central end portion of the first compressed space in the center penetrates. A second driven scroll shaft portion rotatably supported by the housing and a second driven scroll shaft portion extending to the opposite side of the second driven scroll of the second driven scroll end plate and rotatably held in the housing. It is desirable to include the driven scroll shaft portion of 2.

As a result, the first and second compressed spaces defined on both sides of the drive scroll end plate are axially sandwiched by the first and second drive scroll bearings connected at the outer peripheral portion. Since the pressure generated in the first and second compression spaces can be offset in the axial direction, for example, the drive scroll member and the driven scroll member are prevented from acting as a load on the bearing provided to rotatably support the housing. It is something that can be done. Further, since the load on the driven scroll member shaft portion can be reduced by this, the shaft portion can be formed of a lightweight member such as an aluminum material.

Further, the rotor is arranged inside a rotary extension portion extending axially toward the housing from the outer peripheral end portion of the second drive scroll receiver, and the stator is the second from the housing. It is desirable that the fixed extension portion extending to the drive scroll receiving side is arranged so as to face the rotor on the outer circumference.

With this structure, the radial dimension of the scroll fluid machine can be reduced.

Furthermore, the rotor is arranged so as to bridge the outer peripheral portion of the first drive scroll receiver and the outer peripheral portion of the second drive scroll receiver, and the stator is fixed to the housing so as to face the rotor. It is desirable to be done.

With this structure, the axial dimension of the scroll fluid machine can be reduced.

Further, it is desirable that the rotor is composed of a plurality of electromagnets arranged at a predetermined polarity, and the stator is a coil that generates a rotating magnetic field with respect to the rotor.

According to the present invention, since the drive scroll member is directly rotated by the rotor fixed to the drive scroll member, the torque generated in the rotor can be transmitted to the drive scroll member without going through the rotation axis. Since the rotating shaft can use lightweight members such as aluminum instead of iron, and the shaft diameter can be reduced, the bearing can be made smaller, and the weight, size, and speed of the scroll fluid machine can be easily achieved. be.

Further, according to the present invention, the first and second compressed spaces defined on both sides of the drive scroll end plate are axially sandwiched by the first and second drive scroll receivers connected at the outer peripheral portion. Therefore, the pressure generated in the first and second compression spaces can be offset in the axial direction, so that, for example, as a load on the bearing provided to rotatably support the drive scroll member and the driven scroll member to the housing. Further, the load on the driven scroll member shaft portion can be reduced, so that the shaft portion can be formed of a lightweight member such as an aluminum material.

As described above, according to the scroll fluid machine according to the present invention, the stator of the electric motor as the drive unit is fixed to the housing, and the rotor is fixed to the drive scroll receiver to directly drive the scroll fluid. It is possible to achieve weight reduction, high speed and miniaturization of the machine.

It is sectional drawing of the scroll type fluid machine which concerns on Example 1 of this invention. It is sectional drawing of the scroll type fluid machine which concerns on Example 2 of this invention.

Hereinafter, examples of the present invention will be described with reference to the drawings.

The scroll fluid machine 1 according to the first embodiment of the present invention includes, for example, as shown in FIG. 1, a housing 2, a compression unit 3 arranged in the housing 2, and a drive unit 4 for driving the compression unit 3. Consists of.

The compression unit 3 is composed of a drive scroll member 5 and a driven scroll member 6. Further, the driven scroll member 6 is composed of the first and second driven scroll members 6a and 6b.

The drive scroll member 5 has a drive scroll end plate 50 having a communication hole 5a opened in the center, and first and second drive scrolls that are erected on both sides of the drive scroll end plate 50 and extend radially in a spiral shape. The housing includes 51, 52, first and second drive scroll receivers 54, 55 that support the outer peripheral end 53 of the drive scroll end plate 50 from both sides, and first and second drive scroll receivers 54, 55. On the other hand, the first and second drive scroll shaft portions 56 and 57 that are rotatably held are provided.

The first driven scroll member 6a meshes with the first driven scroll 6a1 that meshes with the first drive scroll 51 to define the first compression space 71, and meshes with the second drive scroll 52. The second driven scroll 6b1 defining the second compression space 72 communicating with the central end of the first compression space 71 through the communication hole 5a of the drive scroll end plate 50, and the first The first driven scroll end plate 6a2 on which the driven scroll 6a1 stands, the second driven scroll end plate 6b2 on which the second driven scroll 6b1 stands, and the first driven scroll end plate 6a1 from the central portion. A first driven scroll that extends to the opposite side of the driven scroll 6a2 of 1 and is rotatably supported by the housing 2 with a discharge hole 73 penetrating in the center and communicating with the central end portion of the first compressed space 71. A scroll shaft portion 6a3 and a second driven scroll shaft portion 6b3 extending to the opposite side of the second driven scroll 6b1 of the second driven scroll end plate 6b2 and rotatably held by the housing 2 are provided. ..

Further, the first and second drive scroll shaft portions 56, 57 of the first and second drive scroll receivers 54, 55 are rotatably held in the housing 2 via bearings 81, 82, and further, the said. The first and second driven scroll members 6a and 6b are rotatably held in the housing 2 via the bearings 83 and 84. Further, a shaft seal 85 seals between the first driven scroll shaft portion 6a3 and the housing 2, and the inside and outside of the housing 2 are blocked. The shaft seal 85 is held by a cap 22 fixed to the housing 2.

Further, in order to relatively rotate the drive scroll member 5 and the driven scroll member 6 between the first driven scroll end plate 6a2 of the first driven scroll member 6a and the first drive scroll receiver 54. An old dam ring 9 is provided as a rotation prevention mechanism.

The drive unit 4 is arranged so as to face the rotor 41 and a rotor 41 made of a permanent magnet fixed inside an L-shaped sleeve 58 fixed to the end surface of the second drive scroll receiver 55. It is composed of a stator 42 composed of a coil that generates a rotating magnetic field with respect to 41. Further, the stator 42 is provided on the outer periphery of the rib 21 extending inward in a cylindrical shape from the housing 2.

With the above configuration, when the stator 42 of the drive unit 4 is energized, a rotating magnetic field is generated in the stator 42, and the rotor 41 made of a permanent magnet rotates under the influence of the rotating magnetic field, thereby causing the first and second. The drive scroll member 5 rotates about the bearings 81 and 82 via the drive scroll receivers 54 and 55, and is connected to the drive scroll member 5 via an old dam ring 9 as a rotation synchronization mechanism. The driven scroll members 6a1 and 6b1 of the above rotate around the bearings 83 and 84 as a base point, and perform a turning motion relative to the drive scroll member 5. As a result, the volumes of the first and second compressed spaces 71 and 72 can be reduced from the outer peripheral direction to the central direction of the drive scroll member 5. The fluid is sucked from the outer peripheral part and compressed toward the center side. Further, in the central portion of the drive scroll member 5, the second compression space 72 communicates with the communication hole 5a, and further discharges the compressed fluid through the discharge hole 73 formed in the first driven scroll shaft portion 6a3. It is something that can be done.

As a result, the driving force (torque) of the rotor 41 is directly transmitted to the outer peripheral portion of the drive scroll member 5, so that the compression unit 3 can be operated efficiently, and the member has high strength (heavy material). Since the rotation shaft that needs to be formed by the above is not used, the first and second drive scroll shaft portions 56, 57 are integrally lightweight with the first and second drive scroll receivers 54, 55, respectively. Since it can be formed of a material such as aluminum, the first and second driven scroll shaft portions 6a3 and 6b3 are integrally made of the same lightweight material as the first and second driven scroll members 6a1 and 6b1. Therefore, the scroll fluid machine 1 can be made lighter.

Further, since the scroll fluid machine 1 according to the first embodiment has a structure in which the rotor 41 is provided on the sleeve 58 extending axially from the second drive scroll receiver 55, the dimensions of the scroll fluid machine 1 in the radial direction are large. It can suppress the expansion.

In the scroll fluid machine 1A according to the second embodiment of the present invention shown in FIG. 2, the parts having the same effect as those of the above-mentioned Example 1 and the parts having the same effect are designated by the same reference numerals and the description thereof will be described. Omit.

In the scroll fluid machine 1A according to the second embodiment, the stator 42A constituting the drive unit 4A is sandwiched and fixed by the housings 2A and 2B. Further, the rotor 41A constituting the drive unit 4A is fixed to the outer peripheral end portion 53 of the drive scroll member 5 so as to face the stator 42A. In the second embodiment, the stator 42A is sandwiched and fixed by the housings 2a and 2b, but the stator 42A may be arranged so as to face the rotor 41A on the inner peripheral surface of the housing 2 of the first embodiment described above. It is a thing.

With the above structure, in the scroll fluid machine 1A according to the second embodiment of the present invention, the axial dimension of the scroll fluid machine 1A can be reduced.

The scroll fluid machines 1 and 1A according to the present invention can use the compressed unit 3 as a power source by inflowing compressed air, a refrigerant, a gas, or the like from the discharge side and rotationally expanding the machine. In Examples 1 and 2, the power units 4 and 4A can be used as a generator.

1,1A Scroll fluid machine 2,2A, 2B Housing 3 Compression unit 4 Drive unit 5 Drive scroll member 5a Communication hole 6 Driven scroll member 6a First driven scroll member 6a1 First driven scroll 6a2 First driven scroll end plate 6a3 1st driven scroll shaft 6b 2nd driven scroll member 6b1 2nd driven scroll 6b2 2nd driven scroll end plate 6b3 2nd driven scroll shaft 9 Oldam ring 21 rib 22 cap 41, 41A rotor 42, 42A stator 50 Drive scroll end plate 51 First drive scroll 52 Second drive scroll 53 Outer peripheral end 54 First drive scroll receiver 55 Second drive scroll receiver 56 First drive scroll shaft portion 57 Second drive scroll shaft portion 58 Sleeve 71 First compression space 72 Second compression space 73 Discharge holes 81, 82, 83, 84 Bearing 85 Shaft seal

Claims (4)

A drive scroll member including at least one drive scroll extending in a spiral shape and a driven scroll member that meshes with the drive scroll to define a compression space, and is connected to the drive scroll member via a rotation synchronization mechanism. The driven scroll member is provided in the housing, and the drive unit for rotating the drive scroll member is composed of a stator fixed in the housing and a rotor fixed to the drive scroll member. In a scroll-type fluid machine ,
The drive scroll member includes a drive scroll end plate having a communication hole in the center, first and second drive scrolls that are erected on both sides of the drive scroll end plate and extend radially in a spiral manner, and the drive. It is provided with first and second drive scroll receivers that support the outer peripheral end of the scroll end plate from both sides and are rotatably supported by the housing.
The driven scroll member meshes with the first driven scroll that meshes with the first drive scroll to define a first compression space, and meshes with the second drive scroll to communicate with the drive scroll end plate. A second driven scroll that defines a second compressed space that communicates with the central end of the first compressed space, and a first driven scroll end plate on which the first driven scroll stands. , The second driven scroll end plate on which the second driven scroll stands, and the first compression in the center extending from the central portion of the first driven scroll end plate to the opposite side of the first driven scroll. On the opposite side of the first driven scroll shaft portion that is rotatably supported by the housing and the second driven scroll end plate of the second driven scroll end plate, through which the discharge hole communicating with the central end portion of the space penetrates. A scroll fluid machine comprising a second driven scroll shaft portion that extends and is rotatably held in the housing . The rotor is arranged inside a rotary extension portion extending axially toward the housing from the outer peripheral end portion of the second drive scroll receiver, and the stator is the second drive scroll from the housing. The scroll fluid machine according to claim 1 , wherein the scroll fluid machine is arranged so as to face the rotor on the outer periphery of a fixed extension portion extending to the receiving side. The rotor is arranged so as to bridge the outer peripheral portion of the first drive scroll receiver and the outer peripheral portion of the second drive scroll receiver, and the stator is fixed to the housing so as to face the rotor. The scroll fluid machine according to claim 1 . The scroll fluid machine according to claim 2 or 3 , wherein the rotor is composed of a plurality of electromagnets arranged at a predetermined polarity, and the stator is a coil that generates a rotating magnetic field with respect to the rotor.

Images