Motor compressor

Abstract

To suppress transmission of vibration generated in a stator to an inner circumferential surface of a housing, and ensure a sufficient area of a refrigerant flow path.SOLUTION: Provided is a scroll compressor in which a motor 50 for driving a scroll compression mechanism includes a stator 51 and a rotor 52, the stator 51 has an outer circumference portion 51b and a plurality of tooth portions 51a, the outer circumference portion 51b has a first cut portion 51c1 formed in a first position and a second cut portion 51c2 formed in a second position and having a longer length in a circumferential direction CD than the first cut portion 51c1, the first position where the first cut portion 51c1 is formed is surrounded by a region where the outer circumference portion 51b is in contact with an inner circumferential surface 30a of a front housing 30, and the second position where the second cut portion 51c2 is formed is surrounded by a region where the outer circumference portion 51b is not contact with the inner circumferential surface 30a of the front housing 30 and a refrigerant flow path 10b for allowing a refrigerant to flow through the inner circumferential surface 30a is formed.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to an electric compressor.

Background Art

[0002] Conventionally, an electric compressor that drives a compressor with a motor to compress a refrigerant has been known (see, for example, Patent Document 1). In Patent Document 1, positioning portions are provided at a plurality of positions in the circumferential direction on the outer peripheral surface of the stator, and the stator is fixed to the housing by fastening fastening bolts inserted into the positioning portions to the housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As a method of fixing the stator to the housing without using fastening bolts, for example, a shrink fitting method is known in which the stator is inserted in a state where the housing is heated and expanded, and the outer peripheral portion of the stator is in contact with the inner peripheral surface of the housing.

[0005] However, when the outer peripheral portion of the stator is brought into contact with the inner peripheral surface of the housing by shrink fitting, the vibration generated in the stator when driving the motor is transmitted to the inner peripheral surface of the housing through the outer peripheral portion of the stator, and large vibrations occur on the surface of the housing. Further, when the area of the region where the outer peripheral portion of the stator and the inner peripheral surface of the housing are in contact becomes wide, it is impossible to sufficiently secure the area of the refrigerant flow path for circulating the refrigerant flowing into the housing to the compressor.

[0006] The present disclosure has been made in view of such circumstances, and an object thereof is to provide an electric compressor capable of reducing the transmission of vibrations generated in the stator to the inner peripheral surface of the housing through the outer peripheral portion of the stator when driving the motor, and ensuring a sufficient area for the refrigerant flow path.

Means for Solving the Problems

[0007] A scroll compressor according to an aspect of the present disclosure includes a housing formed in a cylindrical shape extending along an axis, a compression unit disposed inside the housing and rotating around the axis to compress refrigerant, and a motor that rotationally drives the compression unit around the axis. The motor includes a stator disposed inside the housing so as to extend along the axis, and a rotor disposed on the inner peripheral side of the stator. The stator has an outer peripheral portion and a plurality of teeth portions disposed at a plurality of positions in the circumferential direction around the axis so as to project from the outer peripheral portion toward the axis and around which coil windings are wound. The outer peripheral portion has a first notch formed at a first position included in the plurality of positions in the circumferential direction where the plurality of teeth portions are disposed, and a second notch formed at a second position included in the plurality of positions in the circumferential direction where the plurality of teeth portions are disposed and having a longer circumferential length than the first notch. The first position where the first notch is formed is a position sandwiched between regions where the outer peripheral portion contacts the inner peripheral surface of the housing, and the second position where the second notch is formed is sandwiched between regions where the outer peripheral portion and the inner peripheral surface of the housing do not contact, and is a position where a refrigerant flow path through which the refrigerant flows is formed on the inner peripheral surface.

Advantages of the Invention

[0008] According to the present disclosure, it is possible to provide an electric compressor capable of reducing the transmission of vibrations generated in the stator to the inner peripheral surface of the housing through the outer peripheral portion of the stator when driving the motor, and ensuring a sufficient area for the refrigerant flow path.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0010] A scroll compressor (electric compressor) 100 according to an embodiment of the present disclosure will be described with reference to the drawings. The scroll compressor 100 of the present embodiment is used, for example, in a vehicle air conditioner.

[0011] FIG. 1 is a longitudinal sectional view showing a schematic configuration of the scroll compressor 100 according to the present embodiment. As shown in FIG. 1, the scroll compressor 100 includes a bearing housing (first housing) 10, a rear housing (second housing) 20, a front housing (third housing) 30, a scroll compression mechanism (compression part) 40, a motor 50, a bearing part 60, an inverter 70, and a gasket 80.

[0012] The bearing housing 10, the rear housing 20, and the front housing 30 form the outer shell of the scroll compressor 100 and are formed of an aluminum alloy. The bearing housing 10 is formed in a cylindrical shape along an axis X1 that is the center around which the orbiting scroll 42 orbits. The bearing housing 10 has an internal space for housing the bearing part 60 and the scroll compression mechanism 40.

[0013] The rear housing 20 seals one end along the axis X1 of the bearing housing 10, and is provided with a discharge port (not shown) for the refrigerant gas compressed by the scroll compression mechanism 40. The front housing 30 seals the other end along the axis X1 of the bearing housing 10, and is provided with an internal space for housing the motor 50 and the inverter 70. The internal space of the front housing 30 that houses the motor 50 communicates with the internal space of the bearing housing 10 that houses the bearing portion 60. The internal space that houses the motor 50 and the internal space that houses the inverter 70 are independent spaces that do not communicate with each other.

[0014] The front housing 30 is provided with a suction port 31 for sucking in the refrigerant. The refrigerant supplied from the outside is introduced into the internal space of the front housing 30 through the suction port 31. The refrigerant introduced into the front housing 30 is guided along the axis X1 through the motor 50 and toward the scroll compression mechanism 40. The refrigerant sucked in through the suction port 31 is a mixed refrigerant (fluid) containing lubricating oil and refrigerant gas.

[0015] Insertion holes for inserting the fastening bolts 90 are formed in the bearing housing 10 and the rear housing 20. At the end of the front housing 30 on the side of the bearing housing 10, fastening holes (not shown) are formed for fastening the male threads formed at the tip of the fastening bolts 90. The bearing housing 10 is fixed in a state of being sandwiched along the axis X1 between the rear housing 20 and the front housing 30 by fastening the fastening bolts 90 to the fastening holes formed in the front housing 30.

[0016] The scroll compression mechanism 40 is a device that is disposed inside the bearing housing 10 and rotates about the axis X1 to compress refrigerant gas. The scroll compression mechanism 40 includes a fixed scroll 41 that is sandwiched and fixed between the bearing housing 10 and the rear housing 20, and a orbiting scroll 42 that meshes with the fixed scroll 41. The scroll compression mechanism 40 compresses the refrigerant gas by causing the orbiting scroll 42 to revolve around the fixed scroll 41 by the driving force of the motor 50.

[0017] The fixed scroll 41 has a spiral wrap (first wall body) 41B which is a wall body erected on one side surface of an end plate (first end plate) 41A. A discharge port 41C through which the refrigerant gas compressed by the fixed scroll 41 and the orbiting scroll 42 is discharged is formed in the end plate 41A.

[0018] The orbiting scroll 42 has a spiral wrap (second wall body) 42B which is a wall body erected on one side surface of an end plate (second end plate) 42A. The orbiting scroll 42 is connected to an eccentric shaft (not shown) connected to the motor 50, and is supported so as to be capable of revolving and orbiting through a rotation prevention mechanism (not shown). The orbiting scroll 42 is supported so as to be capable of revolving and orbiting while being meshed with the spiral wrap 41B of the fixed scroll 41 to prevent rotation.

[0019] As shown in FIG. 1, the scroll compression mechanism 40 has a reed valve 43 attached to the fixed scroll 41 so as to close the discharge port 41C. The reed valve 43 is in an open state when the pressure of the refrigerant gas in the compression chamber 40A becomes a predetermined pressure or more, and guides the refrigerant gas discharged from the discharge port 41C to the discharge space 41D. The refrigerant gas guided to the discharge space 41D is guided to the outside through a discharge port (not shown).

[0020] The motor 50 is a device that rotationally drives the orbiting scroll 42 of the scroll compression mechanism 40 around the axis X1 with respect to the fixed scroll 41. The motor 50 is connected to the orbiting scroll 42 via an eccentric shaft (not shown). Here, with reference to FIGS. 2 and 3, the details of the motor 50 will be described. FIG. 2 is a cross-sectional view taken along the line A-A of the scroll compressor 100 shown in FIG. 1. FIG. 3 is a cross-sectional view of the stator shown in FIG. 2. As shown in FIGS. 2 and 3, the motor 50 includes a stator 51, a rotor 52 disposed on the inner peripheral side of the stator 51, and a drive shaft 53 connected to the rotor 52.

[0021] The stator 51 is formed by laminating a predetermined number of electromagnetic steel sheets punched into an annular shape. The stator 51 is disposed inside the front housing 30 so as to extend along the axis X1. As shown in FIGS. 2 and 3, a plurality of teeth portions 51a are provided on the inner peripheral side of the stator 51. Coil windings (not shown) are wound around each of the plurality of teeth portions 51a of the stator 51 via bobbins (not shown).

[0022] As shown in FIG. 3, the stator 51 has a plurality of teeth portions 51a and an outer peripheral portion 51b to which the plurality of teeth portions 51a are connected. The outer peripheral portion 51b is formed in an annular shape around the axis X1 and has a first outer diameter D1 centered on the axis X1. The teeth portions 51a are arranged at a plurality of positions in the circumferential direction CD around the axis X1 (nine positions of positions P1, P2, P3, P4, P5, P6, P7, P8 shown in FIG. 2) so as to protrude from the outer peripheral portion 51b toward the axis X1.

[0023] As shown in FIGS. 2 and 3, the outer peripheral portion 51b is formed with a first notch portion 51c1 at positions P1, P2, P4, P5, P7, P8 (first positions) included in a plurality of positions P1 to P9 in the circumferential direction CD where a plurality of tooth portions 51a are arranged, and a second notch portion 51c2 at positions P3, P6, P9 (second positions) included in a plurality of positions P1 to P9 in the circumferential direction CD where a plurality of tooth portions 51a are arranged. The length (second length) L2 in the circumferential direction CD of the second notch portion 51c2 is longer than the length (first length) L1 in the circumferential direction CD of the first notch portion 51c1.

[0024] The first notch portion 51c1 and the second notch portion 51c2 are arranged at equal intervals along the circumferential direction CD at a plurality of positions (nine positions P1, P2, P3, P4, P5, P6, P7, P8 shown in FIG. 2) where the tooth portions 51a are arranged. Also, the second notch portion 51c2 is arranged at intervals of 120 degrees at three positions, namely position P3, position P6, and position P9.

[0025] As shown in FIG. 2, in the circumferential direction CD, the regions between position C1 and position C2, between position C3 and position C4, and between position C5 and position C6 are regions where the outer peripheral portion 51b of the stator 51 and the inner peripheral surface 30a of the front housing 30 are in contact. The positions P1, P2, P4, P5, P7, P8 where the first notch portion 51c1 is formed are positions sandwiched by the regions where the outer peripheral portion 51b contacts the inner peripheral surface 30a of the front housing 30.

[0026] Positions P1 and P2 are positions sandwiched by the region where the outer peripheral portion 51b of the stator 51 and the inner peripheral surface 30a of the front housing 30 are in contact from position C1 to position C2. Positions P4 and P5 are positions sandwiched by the region where the outer peripheral portion 51b of the stator 51 and the inner peripheral surface 30a of the front housing 30 are in contact from position C3 to position C4. Positions P7 and P8 are positions sandwiched by the region where the outer peripheral portion 51b of the stator 51 and the inner peripheral surface 30a of the front housing 30 are in contact from position C5 to position C6.

[0027] The position P3 is sandwiched between the outer peripheral portion 51b and the inner peripheral surface 30a of the front housing 30 in a region where they do not contact each other (the region from position C2 to position C3), and is a position where a refrigerant flow path 10b through which refrigerant gas flows is formed on the inner peripheral surface 30a. The position P6 is sandwiched between the outer peripheral portion 51b and the inner peripheral surface 30a of the front housing 30 in a region where they do not contact each other (the region from position C4 to position C5), and is a position where a refrigerant flow path 30b through which refrigerant gas flows is formed on the inner peripheral surface 30a. The position P9 is sandwiched between the outer peripheral portion 51b and the inner peripheral surface 30a of the front housing 30 in a region where they do not contact each other (the region from position C6 to position C1), and is a position where a refrigerant flow path 10b through which refrigerant gas flows is formed on the inner peripheral surface 30a.

[0028] As shown in FIG. 3, the length L1 of the first notch portion 51c1 in the circumferential direction CD is shorter than the length (the third length) L3 of the inner peripheral side end portion of the tooth portion 51a in the circumferential direction CD. The second length L2 of the second notch portion 51c2 in the circumferential direction CD is longer than the circumferential length L3 of the inner peripheral side end portion of the tooth portion 51a.

[0029] The bearing portion 60 is a member that supports a rotating shaft (not shown) that rotates around the axis X1 by the motor 50. An eccentric shaft is provided at the end portion of the rotating shaft on the scroll compressor mechanism 40 side, which is arranged eccentrically with respect to the axis X1.

[0030] The inverter 70 is a device that generates a driving voltage for driving the motor 50 and controls the rotational speed of the motor 50.

[0031] The gasket 80 is disposed between the end face 20a on the rear housing 20 side of the bearing housing 10 and the end face of the rear housing 20 on the bearing housing 10 side, and is a member that forms a sealing region so that refrigerant does not flow out between the end face 10a and the end face 20a.

[0032] The operation and effects of the scroll compressor 100 of the present embodiment described above will be described. According to the scroll compressor 100 of the present embodiment, the positions P1, P2, P4, P5, P7, P8 of the first notch portion 51c1 formed in the outer peripheral portion 51b of the stator 51 are positions sandwiched by the region where the outer peripheral portion 51b of the stator 51 contacts the inner peripheral surface 30a of the front housing 30. Therefore, the vibration of the tooth portions 51a arranged at the positions P1, P2, P4, P5, P7, P8 is transmitted to the inner peripheral surface 30a of the front housing 30 via the outer peripheral portion 51b. On the other hand, since the first notch portion 51c1 is arranged at the positions P1, P2, P4, P5, P7, P8 in the circumferential direction CD where the tooth portions 51a are arranged, the vibration directly transmitted from the tooth portions 51a to the inner peripheral surface 30a of the front housing 30 can be reduced as compared with the case where the first notch portion 51c1 is not arranged.

[0033] Moreover, according to the scroll compressor 100 of the present embodiment, the positions P3, P6, P9 of the second notch portion 51c2 formed in the outer peripheral portion 51b of the stator 51 are sandwiched by the region where the outer peripheral portion 51b of the stator 51 and the inner peripheral surface 30a of the front housing 30 do not contact, and are the positions where the refrigerant flow path 30b through which the refrigerant flows is formed in the inner peripheral surface 30a. Since the second notch portion 51c2 is arranged at the positions P3, P6, P9 in the circumferential direction CD where the tooth portions 51a are arranged, the area of the refrigerant flow path can be sufficiently secured as compared with the case where the second notch portion 51c2 is not arranged.

[0034] According to the scroll compressor 100 of the present embodiment, the length L1 of the first notch portion 51c1 in the circumferential direction CD is shorter than the length L3 of the inner peripheral side end portion of the tooth portion 51a in the circumferential direction CD. Therefore, a sufficient region where the outer peripheral portion 51b of the stator 51 contacts the inner peripheral surface 30a of the front housing 30 can be secured, and a sufficient holding force for the front housing 30 to hold the stator 51 can be secured.

[0035] Further, according to the scroll compressor 100 of the present embodiment, the length L2 in the circumferential direction CD of the second notch portion 51c2 is longer than the length L3 in the circumferential direction CD of the inner circumferential side end portion of the tooth portion 51a. Therefore, in a region where the outer peripheral portion 51b of the stator 51 and the inner circumferential surface 30a of the front housing 30 do not contact each other, the area of the refrigerant flow path 30b can be sufficiently secured.

[0036] Further, according to the scroll compressor 100 of the present embodiment, since the first notch portion 51c1 and the second notch portion 51c2 formed in the outer peripheral portion 51b of the stator 51 are arranged in a balanced manner at equal pitches on the radially outer side of the tooth portion 51a, the vibration of the tooth portion 51a can be averaged and reduced as compared with the case where they are arranged in an unbalanced manner.

[0037] The electric compressor described in the present embodiment described above is understood as follows, for example. The electric compressor (100) according to the first aspect of the present disclosure includes a housing (10, 20, 30) formed in a cylindrical shape extending along an axis (X1), a compression unit (40) disposed inside the housing and rotating around the axis to compress a refrigerant, and a motor (50) that rotationally drives the compression unit around the axis. The motor includes a stator (51) disposed inside the housing so as to extend along the axis, and a rotor (52) disposed on the inner peripheral side of the stator. The stator has an outer peripheral portion (51b) and a plurality of tooth portions (51a) disposed at a plurality of positions in the circumferential direction (CD) around the axis so as to protrude from the outer peripheral portion toward the axis and around which coil windings are wound. The outer peripheral portion has a first notch portion (51c1) formed at a first position (P1, P2, P4, P5, P7, P8) included in the plurality of positions in the circumferential direction where the plurality of tooth portions are disposed, and a second notch portion (51c2) formed at a second position (P3, P6, P9) included in the plurality of positions in the circumferential direction where the plurality of tooth portions are disposed and having a longer length in the circumferential direction than the first notch portion. The first position where the first notch portion is formed is a position sandwiched between regions where the outer peripheral portion of the stator contacts the inner peripheral surface of the housing. The second position where the second notch portion is formed is sandwiched between regions where the outer peripheral portion and the inner peripheral surface of the housing do not contact, and is a position where a refrigerant flow path (10b) through which the refrigerant flows is formed on the inner peripheral surface.

[0038] According to the electric compressor according to the first aspect of the present disclosure, the first position of the first notch portion formed in the outer peripheral portion of the stator is a position sandwiched between regions where the outer peripheral portion of the stator contacts the inner peripheral surface of the housing. Therefore, the vibration of the tooth portion disposed at the first position is transmitted to the inner peripheral surface of the housing via the outer peripheral portion. On the other hand, since the first notch portion is disposed at the first position in the circumferential direction where the tooth portion is disposed, the vibration directly transmitted from the tooth portion to the inner peripheral surface of the housing can be reduced as compared with the case where the first notch portion is not disposed.

[0039] Also, according to the electric compressor according to the first aspect of the present disclosure, the second position of the second notch formed in the outer peripheral portion of the stator is sandwiched in a region where the outer peripheral portion of the stator and the inner peripheral surface of the housing do not contact each other, and is a position where a refrigerant flow path through which refrigerant flows is formed in the inner peripheral surface. Since the second notch is arranged at the second position in the circumferential direction where the teeth portion is arranged, the area of the refrigerant flow path can be sufficiently secured as compared with the case where the second notch is not arranged.

[0040] The electric compressor according to the second aspect of the present disclosure further includes the following configuration in the first aspect. That is, the first length (L1) in the circumferential direction of the first notch is shorter than the length (L3) in the circumferential direction of the inner peripheral side end portion of the teeth portion, and the second length (L2) in the circumferential direction of the second notch is longer than the length in the circumferential direction of the inner peripheral side end portion of the teeth portion.

[0041] According to the electric compressor according to the second aspect of the present disclosure, the first length in the circumferential direction of the first notch is shorter than the length in the circumferential direction of the inner peripheral side end portion of the teeth portion. Therefore, a sufficient region where the outer peripheral portion of the stator and the inner peripheral surface of the housing contact each other can be secured, and a sufficient holding force for the inner peripheral surface of the housing to hold the stator can be secured.

[0042] Also, according to the electric compressor according to the second aspect of the present disclosure, the second length in the circumferential direction of the second notch is longer than the length in the circumferential direction of the inner peripheral side end portion of the teeth portion. Therefore, in a region where the outer peripheral portion of the stator and the inner peripheral surface of the housing do not contact each other, the area of the refrigerant flow path can be sufficiently secured.

[0043] The electric compressor according to the third aspect of the present disclosure further includes the following configuration in the first aspect or the second aspect. That is, the plurality of first notches and the plurality of second notches are arranged at equal intervals along the circumferential direction.

[0044] According to the electric compressor according to the third aspect of the present disclosure, since the plurality of first notches and second notches are evenly and balancedly arranged along the circumferential direction on the outer diameter side in the radial direction of the teeth portion, compared with the case where they are arranged unbalancedly, the vibration of the teeth portion can be averaged and reduced.

Explanation of symbols

[0045] 10 Bearing housing 10a End face 10b Refrigerant flow path 20 Rear housing 20a End face 30 Front housing 30a Inner peripheral surface 30b Refrigerant flow path 31 Suction port 40 Scroll compression mechanism (compression part) 40A Compression chamber 41 Fixed scroll 41A End plate 41B Spiral wrap 41C Discharge port 41D Discharge space 42 Orbiting scroll 43 Reed valve 50 Motor 51 Stator 51a Teeth portion 51b Outer peripheral portion 51c1 First notch 51c2 Second notch 52 Rotor 53 Drive shaft 60 Bearing portion 70 Inverter 80 Gasket 90 Fastening bolt 100 Scroll compressor (electric compressor) CD Circumferential direction D1 First outer diameter X1 Axis

Claims

1. A housing formed in a cylindrical shape extending along an axis, A compression part disposed inside the housing and rotating around the axis to compress a refrigerant, A motor for rotationally driving the compression part around the axis, comprising: The motor includes: A stator disposed inside the housing so as to extend along the axis, A rotor disposed on the inner peripheral side of the stator, The stator includes an outer peripheral part, A plurality of teeth parts disposed at a plurality of positions in the circumferential direction around the axis so as to protrude from the outer peripheral part toward the axis and around which a coil winding is wound, The outer peripheral part has a first notch formed at a first position included in the plurality of positions in the circumferential direction where the plurality of teeth parts are disposed, and a second notch formed at a second position included in the plurality of positions in the circumferential direction where the plurality of teeth parts are disposed and having a longer length in the circumferential direction than the first notch, The first position where the first notch is formed is a position sandwiched by regions where the outer peripheral part contacts the inner peripheral surface of the housing, The second position where the second notch is formed is a position sandwiched by a region where the outer peripheral part and the inner peripheral surface of the housing do not contact, and where a refrigerant flow path through which the refrigerant flows is formed in the inner peripheral surface, an electric compressor.

2. The first length in the circumferential direction of the first notch is shorter than the length in the circumferential direction of the inner peripheral side end of the teeth part, The electric compressor according to claim 1, wherein the second length in the circumferential direction of the second notch is longer than the length in the circumferential direction of the inner peripheral side end of the teeth part.

3. The electric compressor according to claim 1 or claim 2, wherein the plurality of first notches and the plurality of second notches are arranged at equal intervals along the circumferential direction.

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