Electric compressor

Abstract

To prevent contaminants contained in a fluid suctioned from a suction port from directly colliding with a conductor wire.SOLUTION: A motor compressor 1 includes: an electric motor 5 which has a stator core 51, a stator coil 52 formed by winding a conductor wire 60 around the stator core 51, and a rotor 53 attached to a rotary shaft 4 and rotates the rotary shaft 4 through the rotor 53 by energization to the stator coil 52; a compression mechanism 3 which is driven by the rotary shaft 4 to compress a refrigerant; and a housing 2 which has a suction port 21a and a discharge port 24a and houses the rotary shaft 4, the electric motor 5, and the compression mechanism 3. The refrigerant suctioned from the suction port 21a is compressed by the compression mechanism 3 to be discharged from the discharge port 24a. The motor compressor 1 has a protection member 58 which covers a portion 61, which faces the suction port 21a, of the conductor wire 60.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an electric compressor in which a compression mechanism for compressing a refrigerant and an electric motor are housed in a housing. [Background technology]

[0002] An example of a conventional electric compressor is described in Patent Document 1. The electric compressor described in Patent Document 1 includes an electric motor that rotates a rotating shaft, a compression mechanism driven by the rotating shaft to compress a refrigerant, and a housing having a suction port and a discharge port and accommodating the rotating shaft, the electric motor, and the compression mechanism, such that the refrigerant drawn through the suction port is compressed by the compression mechanism and discharged from the discharge port. An example of the electric motor described above includes a stator core, a stator coil formed by winding a conductor around the stator core, and a rotor attached to the rotating shaft. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-051328 Summary of the Invention [Problem to be solved by the invention]

[0004] However, fluids such as refrigerant and lubricating oil drawn into the suction port contain contamination (foreign matter) generated by, for example, sliding between metals. In the electric compressor described above, if a portion of the conductor faces the suction port, the contamination may collide with the conductor, causing damage to the conductor.

[0005] Therefore, an object of the present invention is to prevent contaminants contained in the fluid drawn in from the suction port from directly colliding with the conductor. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided an electric compressor, the electric compressor including: a stator core, a stator coil formed by winding a conductor around the stator core, and a rotor attached to a rotating shaft, the electric motor rotating the rotating shaft via the rotor when current is applied to the stator coil, a compression mechanism driven by the rotating shaft to compress a refrigerant, and a housing having an intake port and a discharge port and accommodating the rotating shaft, the electric motor, and the compression mechanism, the compressor configured such that refrigerant drawn through the intake port is compressed by the compression mechanism and discharged from the discharge port. . electric The dynamic compressor has a protective member that covers a portion of the conductor that faces the suction port. The electric motor further includes an insulator for insulating the stator core from the stator coil. A protective member is provided on the insulator, and the portion is disposed between the protrusion of the insulator and the protective member. [Effects of the Invention]

[0007] According to the present invention, the portion of the conducting wire facing the suction port is covered with a protective member, which prevents contaminants contained in the fluid drawn in through the suction port from colliding with the conducting wire, thereby preventing the contaminants from directly colliding with the conducting wire. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing an electric compressor according to a first embodiment of the present invention. [Figure 2] 2A and 2B are a perspective view and a front view of a stator in the first embodiment. [Figure 3] 3A and 3B are a perspective view and a front view of an insulator member in the first embodiment. [Figure 4] FIG. 3 is a side view of an insulator member according to the first embodiment. [Figure 5] 5A and 5B are a perspective view and a front view of a stator according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0010] FIG. 1 is a diagram showing an electric compressor 1 according to a first embodiment of the present invention. The electric compressor 1 is a horizontally-mounted inverter-integrated electric compressor in which a compression mechanism 3 and an electric motor 5 are arranged in series horizontally within a housing 2, and which is integrally equipped with an inverter 8 serving as a motor drive circuit. The electric compressor 1 is applied to, for example, a vehicle air conditioning system, and is incorporated into a refrigerant circuit through which a refrigerant circulates, together with a condenser, a pressure reducer (such as an expansion valve), and an evaporator, to form a refrigeration cycle system. In this embodiment, refrigeration oil (lubricating oil) circulates through the refrigerant circuit together with the refrigerant.

[0011] 1, the housing 2 of the electric compressor 1 includes a main housing 21, an inverter housing 22, an inverter cover 23, and a discharge housing 24. The main housing 21, the inverter housing 22, the inverter cover 23, and the discharge housing 24 are formed of, for example, a metal material.

[0012] The main housing 21 is formed in a cylindrical shape. One end (left side in FIG. 1 ) of the peripheral wall of the main housing 21 is formed with a suction port 21a that draws in refrigerant from the evaporator side. In this embodiment, the suction port 21a is provided in the upper part of the main housing 21 and opens upward. The main housing 21 accommodates a compression mechanism 3, a rotary shaft 4, and an electric motor 5.

[0013] The opening at the one end of the main housing 21 is closed by the inverter housing 22. The inverter housing 22 is fastened to the main housing 21 with bolts (not shown). The inverter housing 22 is formed in a cylindrical shape with a bottom, and its bottom wall portion forms the partition wall 7 that separates the inside of the main housing 21 from the inside of the inverter housing 22.

[0014] An inverter 8 serving as a motor drive circuit is housed inside the inverter housing 22. An opening on the opposite side of the inverter housing 22 from the bottom wall portion is closed by an inverter cover 23. The inverter cover 23 is fastened to the inverter housing 22 with bolts (not shown).

[0015] The opening on the other end of the main housing 21 is closed by a discharge housing 24. The discharge housing 24 is fastened to the main housing 21 with bolts (not shown). The discharge housing 24 is formed with a discharge port 24a that discharges the refrigerant toward the condenser and a discharge passage 24b that guides the refrigerant to the discharge port 24a. In this embodiment, the discharge port 24a is provided at the top of the discharge housing 24 and opens upward.

[0016] The compression mechanism 3 is disposed on the discharge housing 24 side within the main housing 21. The compression mechanism 3 is driven by rotation of the rotary shaft 4, and is configured to take in refrigerant drawn into the main housing 21 through the suction port 21a, compress it, and discharge the compressed refrigerant. The refrigerant discharged from the compression mechanism 3 is guided to the discharge port 24a through a discharge passage 24b and is discharged from the discharge port 24a. Although not particularly limited, for example, a scroll-type compression mechanism including a fixed scroll and a movable scroll can be used as the compression mechanism 3.

[0017] The rotating shaft 4 extends in the axial direction of the main housing 21. One end of the rotating shaft 4 is connected to the compression mechanism 3 via a connecting portion 9, and the rotating shaft 4 is rotatably supported within the main housing 21 by a bearing (not shown).

[0018] When the compression mechanism 3 is the scroll-type compression mechanism, the connecting part 9 may be a crank mechanism that converts the rotational motion of the rotary shaft 4 into the orbiting motion of the movable scroll. The scroll-type compression mechanism as the compression mechanism 3 is configured so that the rotation of the rotary shaft 4 causes the movable scroll to orbit relative to the fixed scroll, thereby taking in and compressing a refrigerant and discharging the compressed refrigerant.

[0019] The electric motor 5 is disposed on the inverter housing 22 side within the main housing 21. That is, the electric motor 5 is disposed at a position within the main housing 21 closer to the suction port 21a than the compression mechanism 3. The electric motor 5 is configured to rotate the rotary shaft 4. In other words, the electric motor 5 is configured to drive the compression mechanism 3 via the rotary shaft 4.

[0020] 2(A) and 2(B) are a perspective view and a front view of the stator 50 that constitutes the electric motor 5. As shown in FIGS. 1 and 2, the electric motor 5 has a stator 50 having a stator core 51 and a stator coil 52, and a rotor 53.

[0021] The stator core 51 is made of a magnetic material and has a cylindrical shape. The stator core 51 is supported on the inner wall of the main housing 21. The stator core 51 has a plurality of (here, 12) teeth 511 that protrude radially inward (toward the rotating shaft 4). The plurality of teeth 511 are arranged at equal intervals in the circumferential direction.

[0022] The stator coil 52 is configured by winding a conductor 60 around the stator core 51 in a concentrated winding manner. Specifically, the stator coil 52 is configured by winding the conductor 60 around each of the multiple teeth 511 of the stator core 51. The conductor 60 is, for example, a linear conductor (core wire) with an insulating coating formed thereon. In other words, the conductor 60 is a winding of the stator 50.

[0023] The stator 50 further includes an insulator 54 for electrically insulating the stator core 51 from the stator coil 52. The insulator 54 is made of an insulating resin material. In this embodiment, the insulator 54 is divided into two insulator members 541 and 542.

[0024] 3(a) and 3(b) are a perspective view and a front view of the insulator member 541. FIG.

[0025] The insulator member 541 includes an annular base portion 541a and protrusions 541b extending radially inward from the base portion 541a. The protrusions 541b are interposed between the teeth 511 and the stator coils 52 to insulate them from each other. The insulator member 542 may have the same configuration as the insulator member 541.

[0026] At the end of base portion 541a of insulator member 541 on the coil end side of stator coil 52, a plurality of (here, 12) protrusions 55 for hooking conductive wire 60 are formed at equal intervals in the circumferential direction.

[0027] Here, the portion P shown in FIGS. 1 to 4 faces the intake port 21a.

[0028] The rotor 53 is disposed radially inside the stator core 51 (of its multiple teeth 511). A permanent magnet (not shown) is incorporated into the rotor 53. The rotor 53 is formed in a cylindrical shape, and is fixed to the rotating shaft 4 with the rotating shaft 4 inserted into its hollow portion. In other words, the rotor 53 is attached to the rotating shaft 4 and is configured to rotate integrally with the rotating shaft 4.

[0029] The inverter 8 has various electronic components such as a power module including a smoothing capacitor and multiple power switching elements, and a circuit board on which the various electronic components are mounted. The inverter 8 is connected to an external power source (such as an on-board battery) via a first power supply line (not shown), and is connected to the electric motor 5 (the stator coil 52) via a second power supply line (not shown) that passes through the partition wall 7 in an airtight and liquidtight manner.

[0030] When the inverter 8 receives a power supply voltage from the external power supply, it outputs an AC current to the stator coil 52 of the electric motor 5. That is, the stator coil 52 is energized. When the stator coil 52 is energized, a rotating magnetic field is generated, and the rotor 53 rotates in synchronization with the generated rotating magnetic field. This rotates the rotating shaft 4, driving the compression mechanism 3. Also, the refrigerant is drawn into the main housing 21 through the suction port 21a.

[0031] The refrigerant drawn into the main housing 21 from the suction port 21a first passes through the electric motor 5 and then through the compression mechanism 3. That is, the refrigerant drawn into the suction port 21a passes through the electric motor 5 and then through the compression mechanism 3. The refrigerant drawn into the suction port 21a cools the electric motor 5 as it passes through the electric motor 5, and is compressed by the compression mechanism 3 as it passes through the compression mechanism 3, and the compressed refrigerant is discharged from the discharge port 24a.

[0032] In this embodiment, a protective member 58 that covers a portion 61 of the conducting wire 60 that faces the suction port 21a is provided on the base 541a of the insulator member 541. Particularly in this embodiment, the protective member 58 is integrally formed with the base 541a of the insulator member 541. Note that in this embodiment, the portion 61 of the conducting wire 60 also serves as a portion that connects the stator coils 52 that are adjacent to each other in the circumferential direction.

[0033] The protective member 58 has a U-shaped wall when viewed from the front of the insulator member 541. The protective member 58 is configured, for example, by a pair of wall portions 58a, 58b facing each other with a gap between them, and a wall portion 58c extending across the wall portions 58a, 58b. The wall portions 58a, 58b each extend radially outward from the base portion 541a of the insulator member 541. The wall portion 58c extends approximately parallel to the base portion 541a of the insulator member 541.

[0034] Wall portion 58c of protective member 58 faces suction port 21a. When viewed from suction port 21a, portion 61 of conductor 60 is hidden by wall portion 58c of protective member 58. That is, portion 61 of conductor 60 is disposed between protrusion 55 of insulator member 541 and wall portion 58c of protective member 58. Furthermore, particularly in this embodiment, protective member 58 covers portion 61 of conductor 60 and protrusion 55.

[0035] In this embodiment, the shape of the protective member 58 is the above-described U-shaped wall, but the shape of the protective member 58 is not limited to this. For example, the shape of the protective member 58 may be an arc-shaped wall when viewed from the front of the insulator member 541.

[0036] According to this embodiment, the electric compressor 1 includes an electric motor 5 having a stator core 51, a stator coil 52 formed by winding a conductor 60 around the stator core 51, and a rotor 53 attached to a rotating shaft 4. The electric motor 5 rotates the rotating shaft 4 via the rotor 53 when current is applied to the stator coil 52. The electric motor 5 also includes a compression mechanism 3 driven by the rotating shaft 4 to compress a refrigerant. The housing 2 has a suction port 21a and a discharge port 24a and accommodates the rotating shaft 4, the electric motor 5, and the compression mechanism 3. The electric compressor 1 is configured so that refrigerant drawn through the suction port 21a is compressed by the compression mechanism 3 and discharged from the discharge port 24a. The electric motor 5 is an inner rotor motor in which the rotor 53 is disposed radially inside the cylindrical stator core 51. The electric compressor 1 includes a protective member 58 that covers a portion 61 of the conductor 60 facing the suction port 21a. Therefore, the protective member 58 prevents contamination contained in the fluid drawn in from the suction port 21a from colliding with the conductor 60. Therefore, the contamination is prevented from directly colliding with the conductor 60.

[0037] According to this embodiment, the electric motor 5 further includes an insulator 54 for insulating the stator core 51 from the stator coil 52. A protective member 58 is provided on the insulator 54. Preferably, the protective member 58 is formed integrally with the insulator 54. This allows the protective member 58 to be assembled together with the insulator 54.

[0038] Furthermore, according to this embodiment, the portion 61 of the conducting wire 60 is disposed between the protrusion 55 of the insulator 54 and the protective member 58. This effectively protects the portion 61 of the conducting wire 60 from contamination contained in the fluid drawn in from the suction port 21 a.

[0039] Furthermore, according to this embodiment, the protective member 58 is wall-shaped, which allows the protective member 58 to have a simple configuration.

[0040] Next, a second embodiment of the present invention will be described with reference to FIG. 5(a) and 5(b) are a perspective view and a front view of a stator 50 in this embodiment. Differences from the first embodiment will be described.

[0041] In this embodiment, a protective member 59 is provided in place of the above-mentioned protective member 58. The protective member 59 is made of molded resin. In other words, the portion 61 of the conductor 60 is molded (sealed) and covered with resin, and this molded portion functions as the protective member 59. This resin (molded resin) includes, for example, a thermosetting resin having insulating properties, such as epoxy resin.

[0042] The protective member 59 faces the suction port 21a. When viewed from the suction port 21a, the portion 61 of the conductor 60 is hidden by the protective member 59. The portion 61 of the conductor 60 may be disposed between the protrusion 55 of the insulator member 541 and the protective member 59. Furthermore, particularly in this embodiment, the protective member 59 may cover the portion 61 of the conductor 60 and the protrusion 55.

[0043] In particular, according to this embodiment, the protective member 59 is made of a molded resin that covers the portion 61 of the conductor 60. Therefore, the portion 61 of the conductor 60 can be easily covered by molding with resin, and therefore the portion 61 of the conductor 60 can be easily protected.

[0044] In the first and second embodiments described above, the electric compressor according to the present invention is applied to a horizontally-mounted electric compressor in which the compression mechanism and the electric motor are arranged in series in the horizontal direction within the housing. However, it is clear that the electric compressor according to the present invention may also be applied to a vertically-mounted electric compressor in which the compression mechanism and the electric motor are arranged in series in the vertical direction within the housing.

[0045] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that modifications and changes can be made based on the technical concept of the present invention. The claims at the time of filing were as follows: [Claim 1] an electric motor having a stator core, a stator coil formed by winding a conductor around the stator core, and a rotor attached to a rotating shaft, the electric motor rotating the rotating shaft via the rotor when current is applied to the stator coil; a compression mechanism driven by the rotary shaft to compress a refrigerant; a housing having an intake port and a discharge port and accommodating the rotary shaft, the electric motor, and the compression mechanism; Including, an electric compressor configured such that refrigerant drawn through the suction port is compressed by the compression mechanism and discharged from the discharge port, The electric compressor has a protective member that covers a portion of the conducting wire that faces the suction port. [Claim 2] 2. The electric compressor according to claim 1, wherein the electric motor is an inner rotor type motor in which the rotor is disposed radially inside the cylindrical stator core. [Claim 3] 3. The electric compressor according to claim 1, wherein the protective member is made of a molded resin that covers the portion. [Claim 4] the electric motor further includes an insulator for insulating the stator core from the stator coil; 3. The electric compressor according to claim 1, wherein the protective member is provided on the insulator. [Claim 5] 5. The electric compressor according to claim 4, wherein the protective member is integrally formed with the insulator. [Claim 6] 6. The electric compressor according to claim 4, wherein the portion is disposed between the protrusion of the insulator and the protection member. [Claim 7] 7. The electric compressor according to claim 4, wherein the protective member is wall-shaped. [Explanation of symbols]

[0046] 1 Electric compressor 2. Housing 3. Compression mechanism 4 rotation axes 5 Electric motor 8 inverters 21a Intake port 24a Discharge port 50 Stator 51 stator core 52 stator coil 53 Rotor 54 Insulator 55 Protrusion 58 Protective materials 58a,58b,58c wall 59 Protective materials 60 Conductor 61 parts 511 Teeth 541,542 Insulator members 541a base 541b Protrusion

Claims

1. an electric motor having a stator core, a stator coil formed by winding a conductor around the stator core, and a rotor attached to a rotating shaft, the electric motor rotating the rotating shaft via the rotor when current is applied to the stator coil; a compression mechanism driven by the rotary shaft to compress a refrigerant; a housing having an intake port and a discharge port and accommodating the rotary shaft, the electric motor, and the compression mechanism; Including, an electric compressor configured such that refrigerant drawn through the suction port is compressed by the compression mechanism and discharged from the discharge port, an electric compressor having a protective member covering a portion of the conductor facing the suction port, the electric motor further includes an insulator for insulating the stator core from the stator coil; the protective member is provided on the insulator, the portion is disposed between the protrusion of the insulator and the protective member.

2. 2. The electric compressor according to claim 1, wherein the electric motor is an inner rotor type motor in which the rotor is disposed radially inside the cylindrical stator core.

3. 3. The electric compressor according to claim 1, wherein the protection member is integrally formed with the insulator.

4. The electric compressor according to any one of claims 1 to 3, wherein the protective member is wall-shaped.

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