Electric compressor

Abstract

The utility model provides a scroll compressor. The present invention reduces the transmission of vibration generated by a stator to the inner peripheral surface of a housing, and sufficiently ensures the area of a refrigerant flow path. An electric motor (50) for driving a scroll compression mechanism is provided with a stator (51) and a rotor (52), the stator having an outer peripheral portion (51b) and a plurality of tooth portions (51a), and the outer peripheral portion having a first cutout portion (51c1) formed at a first position and a second cutout portion (51c2) formed at a second position and having a longer length in the circumferential direction (CD) than the first cutout portion. A first position where the first cutout portion is formed is a position sandwiched by a region where the outer peripheral portion is in contact with an inner peripheral surface (30a) of a front housing (30), a second position where the second cutout portion is formed is a position where the outer peripheral portion is not in contact with the inner peripheral surface of the front housing, and a refrigerant flow path (10b) through which a refrigerant flows is formed on the inner peripheral surface.

Description

Technical Field

[0001] This utility model relates to an electric compressor. Background Technology

[0002] Previously, it was known that electric compressors used an electric motor to drive a compressor to compress refrigerant (for example, see Patent Document 1). In Patent Document 1, the stator was fixed to the housing by providing positioning parts at multiple circumferential positions on the outer peripheral surface of the stator, and fastening bolts inserted into the positioning parts were fastened to the housing.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent document 1: Japanese Patent Application Publication No. 2022-60787.

[0006] Technical problem to be solved by the utility model

[0007] As a method for fixing the stator in the housing of an electric motor without using fastening bolts, there is a known method, for example, inserting the stator into a state where the housing is heated and expanded, and performing a thermo-press fit in which the outer periphery of the stator contacts the inner periphery of the housing.

[0008] However, if the outer periphery of the stator is brought into contact with the inner periphery of the housing through thermo-pressing, the vibration generated by the stator when driving the motor is transmitted to the inner periphery of the housing via the outer periphery of the stator, resulting in significant vibration on the surface of the housing. Furthermore, if the contact area between the outer periphery of the stator and the inner periphery of the housing becomes wider, the area of ​​the refrigerant flow path used to allow the refrigerant flowing into the housing to pass through to the compressor cannot be adequately ensured. Utility Model Content

[0009] This invention was made in view of the following circumstances, and its purpose is to provide an electric compressor that can reduce the transmission of vibrations generated by the stator during the drive of the electric motor to the inner circumferential surface of the housing via the outer periphery of the stator, and to sufficiently ensure the area of ​​the refrigerant flow path.

[0010] Technical means for solving technical problems

[0011] One embodiment of the present invention provides a scroll compressor comprising: a housing formed in a cylindrical shape extending along an axis; a compression section disposed inside the housing and rotating about the axis to compress a refrigerant; and an electric motor driving the compression section to rotate about the axis, the electric motor comprising: a stator disposed inside the housing and extending along the axis; and a rotor disposed on the inner circumferential side of the stator, the stator having: an outer circumferential portion; and a plurality of teeth arranged at a plurality of circumferential positions about the axis such that they project from the outer circumferential portion toward the axis and are wound with coil wire, the outer circumferential portion having: a first slit portion. The first cut is formed at a first position included in the plurality of circumferential positions where the plurality of teeth are arranged; and the second cut is formed at a second position included in the plurality of circumferential positions where the plurality of teeth are arranged, and the circumferential length of the second cut is longer than that of the first cut. The first position where the first cut is formed is a position sandwiched by the area where the outer peripheral portion contacts the inner peripheral surface of the housing, and the second position where the second cut is formed is a position sandwiched by the area where the outer peripheral portion does not contact the inner peripheral surface of the housing, and a refrigerant flow path for the refrigerant to flow is formed on the inner peripheral surface.

[0012] Effects of the utility model

[0013] According to this utility model, an electric compressor can be provided that reduces the transmission of vibration generated by the stator to the inner circumferential surface of the housing via the outer periphery of the stator when driving the electric motor, and sufficiently ensures the area of ​​the refrigerant flow path. Attached Figure Description

[0014] Figure 1 This is a longitudinal cross-sectional view showing a schematic structure of a scroll compressor according to one embodiment of the present invention.

[0015] Figure 2 yes Figure 1 The cross-sectional view of the scroll compressor shown is in the direction of arrow AA.

[0016] Figure 3 yes Figure 2 The cross-sectional view of the stator is shown.

[0017] Symbol Explanation

[0018] 10 Bearing Housing

[0019] 10a end face

[0020] 10b Refrigerant Flow Path

[0021] 20 back shell

[0022] 20a end face

[0023] 30 front shell

[0024] 30a inner circumferential surface

[0025] 30b Refrigerant Flow Path

[0026] 31 suction port

[0027] 40 Scroll Compression Mechanism (Compression Section)

[0028] 40A Compression Chamber

[0029] 41 Fixed scroll component

[0030] 41A end plate

[0031] 41B spiral coil plate

[0032] 41C outlet

[0033] 41D Exhaust Space

[0034] 42 vortex components

[0035] 43 Reed Valve

[0036] 50 electric motor

[0037] 51 stator

[0038] 51a tooth section

[0039] 51b peripheral region

[0040] 51c1 First Incision

[0041] 51c2 Second Incision

[0042] 52 rotor

[0043] 53 drive shafts

[0044] 60 bearing section

[0045] 70 inverter

[0046] 80 washers

[0047] 90 fastening bolts

[0048] 100 scroll compressor (electric compressor)

[0049] CD Zhou Xiang

[0050] D1 First outer diameter

[0051] X1 axis. Detailed Implementation

[0052] A scroll compressor (electric compressor) 100 according to one embodiment of the present invention will be described with reference to the accompanying drawings. The scroll compressor 100 of this embodiment is used, for example, in a vehicle air conditioner.

[0053] Figure 1 This is a longitudinal cross-sectional view showing the schematic structure of the scroll compressor 100 according to this embodiment. (See attached image.) Figure 1 As shown, 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 section) 40, an electric motor 50, a bearing section 60, an inverter 70, and a gasket 80.

[0054] The bearing housing 10, the rear housing 20, and the front housing 30 constitute the outer casing of the scroll compressor 100, and are made of aluminum alloy. The bearing housing 10 is formed in a cylindrical shape along the axis X1 that serves as the center of rotation for the scroll member 42. The bearing housing 10 has an internal space for accommodating the bearing section 60 and the scroll compression mechanism 40.

[0055] The rear housing 20 seals one end of the bearing housing 10 along axis X1 and has an outlet (not shown) for refrigerant gas compressed by the scroll compressor mechanism 40. The front housing 30 seals the other end of the bearing housing 10 along axis X1 and has an internal space for housing the motor 50 and the inverter 70. The internal space of the front housing 30 housing the motor 50 is connected to the internal space of the bearing housing 10 housing the bearing section 60. The internal space for housing the motor 50 and the internal space for housing the inverter 70 are independent spaces that are not connected to each other.

[0056] A refrigerant intake port 31 is provided on the front housing 30. Refrigerant supplied from the outside is introduced into the interior space of the front housing 30 through the intake port 31. The refrigerant introduced into the front housing 30 is guided along the axis X1 through the motor 50 and toward the scroll compressor mechanism 40. The refrigerant drawn in through the intake port 31 is a mixture of refrigerant (fluid) containing lubricating oil and refrigerant gas.

[0057] Insertion holes for fastening bolts 90 are formed in the bearing housing 10 and the rear housing 20. A fastening hole (not shown) is formed at the end of the front housing 30 on the bearing housing 10 side; this fastening hole is used to fasten the external thread formed on the front end of the fastening bolt 90. By fastening the fastening bolt 90 to the fastening hole formed in the front housing 30, the bearing housing 10 is fixed in a position where it is clamped between the rear housing 20 and the front housing 30 along axis X1.

[0058] The scroll compressor mechanism 40 is a device disposed inside the bearing housing 10 and rotating about axis X1 to compress refrigerant gas. The scroll compressor mechanism 40 includes a fixed scroll member 41 fixed between the bearing housing 10 and the rear housing 20, and a rotating scroll member 42 meshing with the fixed scroll member 41. Driven by the electric motor 50, the scroll compressor mechanism 40 causes the rotating scroll member 42 to revolve relative to the fixed scroll member 41, thereby compressing the refrigerant gas.

[0059] The fixed scroll member 41 has a wall, namely a scroll-shaped scroll plate (first wall) 41B, which is erected on one side of the end plate (first end plate) 41A. An outlet 41C is formed on the end plate 41A, which is used to discharge the refrigerant gas compressed by the fixed scroll member 41 and the rotating scroll member 42.

[0060] The gyratory scroll member 42 has a scroll-shaped plate (second wall) 42B that is vertically disposed on one side of the end plate (second end plate) 42A. The gyratory scroll member 42 is connected to an eccentric shaft (not shown) connected to the motor 50 and is supported by a rotation-stopping mechanism (not shown) for free revolution and rotational drive. The gyratory scroll member 42 engages with the scroll-shaped plate 41B of the fixed scroll member 41 to prevent rotation and is supported for revolution and rotational motion.

[0061] like Figure 1 As shown, the scroll compressor mechanism 40 has a reed valve 43 mounted on the fixed scroll member 41 in a manner that closes the discharge port 41C. The reed valve 43 opens when the pressure of the refrigerant gas in the compression chamber 40A reaches a specified pressure or higher, guiding the refrigerant gas discharged from the discharge port 41C to the discharge space 41D. The refrigerant gas guided to the discharge space 41D is then guided to the outside from the discharge port (not shown).

[0062] The electric motor 50 is a device that drives the rotary scroll member 42 of the scroll compressor mechanism 40 to rotate about axis X1 relative to the fixed scroll member 41. The electric motor 50 is connected to the rotary scroll member 42 via an eccentric shaft (not shown). Here, refer to... Figure 2 as well as Figure 3 The details of motor 50 will be explained. Figure 2 yes Figure 1 The cross-sectional view of the scroll compressor 100 shown is in the direction of arrow AA. Figure 3 yes Figure 2 The cross-sectional view of the stator is shown. Figure 2 as well as Figure 3 As shown, the motor 50 has: a stator 51, a rotor 52 disposed on the inner circumferential side of the stator 51, and a drive shaft 53 connected to the rotor 52.

[0063] The stator 51 is constructed by stacking a specified number of electromagnetic steel sheets that have been punched into a ring shape. The stator 51 is arranged inside the front housing 30 and extends along axis X1. Figure 2 and Figure 3 As shown, multiple teeth 51a are provided on the inner circumference side of the stator 51. In the stator 51, coil wire (not shown) is wound around the multiple teeth 51a via a bobbin (not shown).

[0064] like Figure 3 As shown, the stator 51 has a plurality of teeth 51a and an outer peripheral portion 51b connecting the plurality of teeth 51a. 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 51a are arranged at a plurality of positions in the circumferential direction CD around the axis X1 in a manner that protrudes from the outer peripheral portion 51b toward the axis X1. Figure 2 The locations shown are P1, P2, P3, P4, P5, P6, P7, P8, and P9 (these are the nine locations).

[0065] like Figure 2 and Figure 3 As shown, the outer peripheral portion 51b has: a first cutout portion 51c1 formed at positions P1, P2, P4, P5, P7, and P8 (first positions) of a plurality of positions P1 to P9 of a circumferential CD in which a plurality of teeth 51a are arranged; and a second cutout portion 51c2 formed at positions P3, P6, and P9 (second positions) of a plurality of positions P1 to P9 of a circumferential CD in which a plurality of teeth 51a are arranged. The length (second length) L2 of the circumferential CD of the second cutout portion 51c2 is longer than the length (first length) L1 of the circumferential CD of the first cutout portion 51c1.

[0066] The first cut portion 51c1 and the second cut portion 51c2 are located at multiple positions where the teeth 51a are arranged. Figure 2 The nine locations shown (P1, P2, P3, P4, P5, P6, P7, P8, and P9) are arranged at equal intervals along the circumferential direction CD. Additionally, the second cutout 51c2 is arranged at 120-degree intervals at locations P3, P6, and P9.

[0067] like Figure 2 As shown, on the circumferential direction CD, the regions between positions C1 and C2, between positions C3 and C4, and between positions C5 and C6 are the areas where the outer peripheral portion 51b of the stator 51 contacts the inner peripheral surface 30a of the front housing 30. Positions P1, P2, P4, P5, P7, and P8 where the first cutout portion 51c1 is formed are the positions sandwiched between the regions where the outer peripheral portion 51b contacts the inner peripheral surface 30a of the front housing 30.

[0068] Positions P1 and P2 are positions sandwiched between the area where the outer periphery 51b of the stator 51, from position C1 to position C2, contacts the inner periphery surface 30a of the front housing 30. Positions P4 and P5 are positions sandwiched between the area where the outer periphery 51b of the stator 51, from position C3 to position C4, contacts the inner periphery surface 30a of the front housing 30. Positions P7 and P8 are positions sandwiched between the area where the outer periphery 51b of the stator 51, from position C5 to position C6, contacts the inner periphery surface 30a of the front housing 30.

[0069] Position P3 is a position where the outer peripheral portion 51b is sandwiched by the area (from position C2 to position C3) where the outer peripheral portion 51b does not contact the inner peripheral surface 30a of the front housing 30, and a refrigerant flow path 10b for refrigerant gas flow is formed on the inner peripheral surface 30a. Position P6 is a position where the outer peripheral portion 51b is sandwiched by the area (from position C4 to position C5) where the outer peripheral portion 51b is sandwiched by the area (from position C6 to position C1) where the outer peripheral surface 51b is sandwiched by the area (from position C6 to position C1) where the inner peripheral surface 30a for refrigerant gas flow is formed on the inner peripheral surface 30a.

[0070] like Figure 3 As shown, the length L1 of the circumferential CD of the first cut portion 51c1 is shorter than the length L3 of the circumferential CD of the inner circumferential end of the tooth portion 51a (the third length). The second length L2 of the circumferential CD of the second cut portion 51c2 is longer than the circumferential length L3 of the inner circumferential end of the tooth portion 51a.

[0071] The bearing section 60 is a component that supports a rotating shaft (not shown) that rotates about axis X1 via a motor 50. An eccentric shaft is provided at the end of the rotating shaft on the side of the scroll compression mechanism 40, which is eccentrically configured relative to axis X1.

[0072] Inverter 70 is a device that generates a drive voltage to drive motor 50 and controls the speed of motor 50.

[0073] The gasket 80 is a component disposed between the end face 10a on the rear housing 20 side of the bearing housing 10 and the end face 20 on the bearing housing 10 side of the rear housing 20, forming a sealing area to prevent refrigerant from flowing out from between the end face 10a and the end face 20a.

[0074] The function and effects of the scroll compressor 100 in this embodiment, as described above, will be explained.

[0075] According to the scroll compressor 100 of this embodiment, the positions P1, P2, P4, P5, P7, and P8 of the first cutout portion 51c1 formed on the outer peripheral portion 51b of the stator 51 are sandwiched between the area 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 teeth 51a disposed at positions P1, P2, P4, P5, P7, and P8 is transmitted to the inner peripheral surface 30a of the front housing 30 via the outer peripheral portion 51b. On the other hand, the first cutout portion 51c1 is disposed at the circumferential direction CD positions P1, P2, P4, P5, P7, and P8 where the teeth 51a are disposed, so compared with the case where the first cutout portion 51c1 is not disposed, the vibration directly transmitted from the teeth 51a to the inner peripheral surface 30a of the front housing 30 can be reduced.

[0076] Furthermore, in the scroll compressor 100 according to this embodiment, the positions P3, P6, and P9 of the second cutout portion 51c2 formed on the outer peripheral portion 51b of the stator 51 are sandwiched between the outer peripheral portion 51b of the stator 51 and the inner peripheral surface 30a of the front housing 30, and a refrigerant flow path 30b for refrigerant flow is formed on the inner peripheral surface 30a. Since the second cutout portion 51c2 is arranged at the circumferential CD positions P3, P6, and P9 where the teeth 51a are arranged, the area of ​​the refrigerant flow path can be sufficiently ensured compared to the case where the second cutout portion 51c2 is not arranged.

[0077] According to the scroll compressor 100 of this embodiment, the length L1 of the circumferential CD of the first cut portion 51c1 is shorter than the length L3 of the circumferential CD of the inner circumferential end of the tooth portion 51a. Therefore, it is possible to sufficiently ensure that the area in which the outer circumferential portion 51b of the stator 51 contacts the inner circumferential surface 30a of the front housing 30 maintains the holding force of the stator 51 on the inner circumferential surface 30a of the front housing 30.

[0078] Furthermore, in the scroll compressor 100 according to this embodiment, the length L2 of the circumferential CD of the second cut portion 51c2 is longer than the length L3 of the circumferential CD of the inner circumferential end of the tooth portion 51a. Therefore, in the area where the outer circumferential portion 51b of the stator 51 does not contact the inner circumferential surface 30a of the front housing 30, the area of ​​the refrigerant flow path 30b can be sufficiently ensured.

[0079] Furthermore, in the scroll compressor 100 according to this embodiment, the first cutout portion 51c1 and the second cutout portion 51c2 formed on the outer peripheral portion 51b of the stator 51 are respectively arranged in a balanced manner at equal intervals on the radial outer side of the tooth portion 51a. Therefore, compared with the case of unbalanced arrangement, the vibration of the tooth portion 51a can be averaged and the vibration can be reduced.

[0080] The electric compressor described in this embodiment above is, for example, as follows.

[0081] The electric compressor 100 of the first embodiment of this utility model includes: housings 10, 20, and 30, which are formed in a cylindrical shape extending along an axis X1; a compression section 40 disposed inside the housings and rotating about the axis to compress refrigerant; and an electric motor 50 that drives the compression section to rotate about the axis. The electric motor includes: a stator 51 disposed inside the housings and extending along the axis; and a rotor 52 disposed on the inner circumferential side of the stator. The stator has: an outer peripheral portion 51b; and a plurality of teeth 51a, which are arranged at multiple positions in a circumferential direction CD about the axis, protruding from the outer peripheral portion toward the axis, and wound with coil wire. The outer peripheral portion has: a first slit. 51c1, the first cut portion is formed at first positions P1, P2, P4, P5, P7, P8, which are included in the plurality of circumferential positions where the plurality of teeth are arranged; and the second cut portion 51c2, the second cut portion is formed at second positions P3, P6, P9, which are included in the plurality of circumferential positions where the plurality of teeth are arranged, and the circumferential length of the second cut portion is longer than that of the first cut portion. The first position where the first cut portion is formed is a position where it is sandwiched by the area where the outer peripheral portion contacts the inner peripheral surface of the outer casing, and the second position where the second cut portion is formed is a position where it is sandwiched by the area where the outer peripheral portion does not contact the inner peripheral surface of the outer casing, and a refrigerant flow path 10b for refrigerant to flow is formed on the inner peripheral surface.

[0082] According to the first aspect of the electric compressor of this utility model, the first position of the first cutout formed on the outer periphery of the stator is a position sandwiched between the area where the outer periphery of the stator contacts the inner periphery of the housing. Therefore, the vibration of the teeth disposed at the first position is transmitted to the inner periphery of the housing via the outer periphery. On the other hand, since the first cutout is disposed at the first position in the circumferential direction where the teeth are disposed, the vibration transmitted directly from the teeth to the inner periphery of the housing can be reduced compared to the case where the first cutout is not disposed.

[0083] Furthermore, in the electric compressor according to the first aspect of this utility model, the second position of the second cutout formed on the outer periphery of the stator is sandwiched between the outer periphery of the stator and the inner periphery of the housing, and a refrigerant flow path for refrigerant circulation is formed on the inner periphery. Since the second cutout is arranged at the second position in the circumferential direction where the teeth are arranged, the area of ​​the refrigerant flow path can be sufficiently ensured compared to the case where the second cutout is not provided.

[0084] According to the first embodiment, the electric compressor of the second embodiment of this utility model further comprises the following structure: the first circumferential length L1 of the first cut portion is shorter than the circumferential length L3 of the inner circumferential end of the tooth portion, and the second circumferential length L2 of the second cut portion is longer than the circumferential length of the inner circumferential end of the tooth portion.

[0085] According to the second aspect of the electric compressor of this utility model, the first circumferential length of the first cut portion is shorter than the circumferential length of the inner circumferential end of the tooth portion. Therefore, the area of ​​contact between the outer circumferential portion of the stator and the inner circumferential surface of the housing can be sufficiently ensured, and the inner circumferential surface of the housing can be sufficiently ensured to maintain the holding force of the stator.

[0086] Furthermore, in the electric compressor according to the second embodiment of this invention, the second circumferential length of the second cut portion is longer than the circumferential length of the inner circumferential end of the tooth portion. Therefore, in the area where the outer circumference of the stator does not contact the inner circumferential surface of the housing, the area of ​​the refrigerant flow path can be sufficiently ensured.

[0087] According to either the first or second method, the third-party electric compressor of this utility model further comprises the following structure: a plurality of first cutouts and a plurality of second cutouts are arranged at equal intervals along the circumferential direction.

[0088] According to the third-party electric compressor of this utility model, a plurality of first cuts and second cuts are respectively and evenly and well arranged on the radial outer side of the teeth along the circumferential direction. Therefore, compared with the case of unbalanced arrangement, the vibration of the teeth can be averaged and vibration reduced.

Claims

1. An electric compressor, characterized in that, have: The outer casing is formed as a cylinder extending along an axis; A compression section, disposed inside the housing, which rotates about the axis to compress the refrigerant; and An electric motor drives the compression unit to rotate about the axis. The electric motor has the following features: Stator, which is configured inside the housing to extend along the axis; and The rotor is disposed on the inner circumferential side of the stator. The stator has: peripheral part; as well as Multiple teeth are arranged at multiple circumferential positions around the axis, protruding from the outer periphery toward the axis, and are wound with coiled wire. The outer peripheral portion has: a first cut portion formed at a first position included in the plurality of positions in the circumferential direction where the plurality of teeth are arranged; And a second cut portion, which is formed at a second position included in the plurality of circumferential positions where the plurality of teeth are arranged, and the circumferential length of the second cut portion is longer than that of the first cut portion. The first position where the first cut is formed is a position sandwiched between the area where the outer peripheral portion contacts the inner peripheral surface of the outer shell. The second position where the second cut is formed is a position where the outer peripheral portion is sandwiched by an area that does not contact the inner peripheral surface of the outer casing, and a refrigerant flow path for the refrigerant to flow is formed on the inner peripheral surface.

2. The electric compressor according to claim 1, characterized in that, The first circumferential length of the first cut portion is shorter than the circumferential length of the inner circumferential end of the tooth portion. The second circumferential length of the second cut portion is longer than the circumferential length of the inner circumferential end of the tooth portion.

3. The electric compressor according to claim 1 or 2, characterized in that, The plurality of first cut portions and the plurality of second cut portions are arranged at equal intervals along the circumferential direction.

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