Motor, compressor, and air conditioner

Abstract

The invention provides a motor, a compressor and an air conditioner, and discloses a technology for suppressing the influence caused by the existence of a space communicating in the radial direction in a protruding part, protruding out of a stator core, of a stator coil. The compressor (100) is provided with a compression mechanism part (120) and a motor (200) which are accommodated in a sealed container (110). A stator (300) of an electric motor (200) includes a stator coil (340) wound around a plurality of teeth of a stator core (310). The stator coil (340) includes a first protruding portion (340A) protruding further toward the first side than the stator core (310) in the axial direction, and a second protruding portion (340B) protruding further toward the second side than the stator core (310). A first surrounding wall (350) extending without gaps in the axial direction and the circumferential direction is provided at least on the outside of the first protruding portion (340A).

Description

Technical Field

[0001] The present invention relates to motors for compressors and air conditioners. Background Art

[0002] As a compressor for adjusting the temperature and humidity of air in a room, a compressor having a compression mechanism section and a motor for driving the compression mechanism section (referred to as an "electric compressor") is used.

[0003] A general compressor includes a hermetic container that houses a compression mechanism section and a motor for driving the compression mechanism section. The motor is composed of a stator and a rotor. The stator includes a stator core, and the rotor includes a rotor core. The motor is housed in the hermetic container in a state where the outer peripheral surface of the stator core abuts against the inner peripheral surface of the hermetic container.

[0004] In addition, as a compressor, a vertical compressor in which a compression mechanism section and a motor are arranged vertically is known. In the vertical compressor, the motor is disposed above or below the compression mechanism section.

[0005] In such a vertical compressor, the refrigerant sucked from the suction port is compressed by the compression mechanism section. And, the refrigerant compressed by the compression mechanism section flows in the gap between the inner peripheral surface of the stator core and the outer peripheral surface of the rotor core and in a refrigerant passage provided in the motor, and is discharged from the discharge port. As the refrigerant passage, a stator passage is usually used. The stator passage includes at least one of a first stator passage formed between the outer peripheral surface of the stator core and the inner peripheral surface of the hermetic container and a second stator passage formed in the stator core. In addition, a rotor passage formed in the rotor core is sometimes used.

[0006] An oil storage section is provided below the compression mechanism section, and lubricating oil for lubricating a sliding section etc. of the compression mechanism section is stored in the oil storage section. Therefore, a mixed gas containing the compressed refrigerant and the lubricating oil is discharged from the discharge port.

[0007] Here, the mixed gas comes into contact with the wall forming the refrigerant passage, the inner peripheral surface of the hermetic container, etc., whereby the lubricating oil is separated from the mixed gas. Then, the lubricating oil separated from the mixed gas falls via the refrigerant passage and the gap, and returns to the oil storage section. Thereby, the amount of lubricating oil contained in the mixed gas discharged from the discharge port is reduced. That is, it is possible to suppress a decrease in the amount of lubricating oil stored in the oil storage section in the hermetic container.

[0008] In addition, in order to suppress a decrease in the amount of lubricating oil stored in the oil storage section in the hermetic container, an oil accumulator is provided. The oil accumulator separates the lubricating oil from the mixed gas discharged from the discharge port. The lubricating oil separated from the mixed gas by the oil accumulator returns to the oil storage section in the hermetic container.

[0009] Conventionally, for example, Japanese Patent Application Laid-Open No. 2009-144581 (Patent Document 1) discloses a technique for improving the separation effect of separating lubricating oil from a mixed gas in a sealed container.

[0010] In Japanese Patent Application Laid-Open No. 2009-144581, a technique is disclosed in which an oil separator capable of colliding with a mixed gas that has passed through a refrigerant passage is provided above a stator core. When the mixed gas collides with the oil separator, the velocity of the mixed gas decreases, whereby the lubricating oil is separated from the mixed gas. The lubricating oil separated from the mixed gas by the oil separator falls via the refrigerant passage and returns to the oil storage section.

[0011] Prior Art Documents

[0012] Patent Documents

[0013] Patent Document 1: Japanese Patent Application Laid-Open No. 2009-144581 Summary of the Invention

[0014] Problems to be Solved by the Invention

[0015] In recent years, miniaturization of a compressor used in an air conditioner has been desired. Along with this, miniaturization of a motor used in the compressor has also been desired. If the motor is miniaturized, the stator core constituting the stator and the rotor core constituting the rotor also become smaller. If a stator passage and a rotor passage are provided in such a miniaturized motor, the passage (referred to as a "magnetic path") through which magnetic flux flows becomes narrow, and the efficiency of the motor and the like decreases.

[0016] In addition, in order to prevent the magnetic path from becoming narrow, a method of forming a first stator passage by a concave surface formed on the inner peripheral surface of a sealed container is also considered instead of a method of forming a first stator passage by a notch surface formed on the outer peripheral surface of a stator core. However, if this method is used, the outer diameter of the sealed container becomes large.

[0017] Thus, as the compressor is miniaturized, if the refrigerant passage provided in the motor is removed (or the cross-sectional area of the refrigerant passage becomes smaller), the amount of lubricating oil contained in the mixed gas returning to the oil storage section via the refrigerant passage decreases in the sealed container. In this case, the amount of lubricating oil contained in the mixed gas returning to the oil storage section largely depends on the amount of lubricating oil returned from a pressure accumulator.

[0018] On the other hand, a stator coil wound around each tooth of a stator core includes a first protruding portion and a second protruding portion that protrude upward and downward from the stator core more than in the axial direction. The first protruding portion and the second protruding portion include a space communicating in the radial direction at an appropriate portion along the circumferential direction.

[0019] If there is a radially communicating space in the first protruding portion and the second protruding portion, the flow of the mixed gas along the axial direction is disordered. For example, a part of the mixed gas flows radially through this space. Therefore, the amount of lubricating oil contained in the mixed gas discharged from the discharge port becomes less. That is, the return amount of the lubricating oil from the accumulator becomes less.

[0020] Therefore, an object of the present disclosure is to suppress the influence caused by the radially communicating space included in the protruding portion of the stator coil that protrudes from the stator core along the axial direction.

[0021] Solution to the problem

[0022] The first disclosure relates to a motor used in a compressor.

[0023] The motor of the first disclosure includes a stator and a rotor. The stator includes a stator core and a stator coil.

[0024] The stator core is formed in a cylindrical shape extending along the axial direction. In addition, the stator core has a yoke extending in the circumferential direction and a plurality of teeth arranged separately in the circumferential direction and extending from the yoke toward the radially inner side (axis side).

[0025] The stator coils are respectively wound around the plurality of teeth. In addition, the stator coil includes a first protruding portion that protrudes from the stator core toward the first side along the axial direction and a second protruding portion that protrudes toward the second side.

[0026] And, a surrounding wall is provided outside at least one of the first protruding portion and the second protruding portion. The surrounding wall extends without a gap along the axial direction and the circumferential direction.

[0027] The surrounding wall can block the radially communicating space of at least one protruding portion. Thereby, the influence caused by the radially communicating space included in at least one protruding portion can be prevented. In addition, it is possible to prevent an electrical component disposed near at least one protruding portion from contacting at least one protruding portion.

[0028] In the motor of the first disclosure, the influence caused by the radially communicating space included in the protruding portion of the stator coil that protrudes from the stator core along the axial direction can be suppressed.

[0029] In a different mode of the motor of the first disclosure, the stator includes a first electrical insulator assembly and a second electrical insulator assembly.

[0030] The first electrical insulator assembly has a first outer wall portion extending in the axial direction and the circumferential direction, and a plurality of first main portions arranged at circumferentially separated positions and extending radially inward from the first outer wall portion. The first electrical insulator assembly is configured such that, on the first side of the stator core in the axial direction, the first outer wall portion faces the yoke and the plurality of first main portions face the plurality of teeth respectively.

[0031] The second electrical insulator assembly has a second outer wall portion extending in the axial direction and the circumferential direction, and a plurality of second main portions arranged at circumferentially separated positions and extending radially inward from the second outer wall portion. The second electrical insulator assembly is configured such that, on the second side of the stator core in the axial direction, the second outer wall portion faces the yoke and the plurality of second main portions face the plurality of teeth respectively.

[0032] The stator coils are wound around the plurality of teeth on which the first main portions and the second main portions are arranged on the first side and the second side in the axial direction respectively.

[0033] At least one notch that opens on the outer peripheral surface and the inner peripheral surface of the outer wall portion is formed in at least one of the first outer wall portion of the first electrical insulator assembly and the second outer wall portion of the second electrical insulator assembly.

[0034] And, a surrounding wall is provided outside at least one of the outer wall portions.

[0035] In this mode, it is also possible to suppress the influence caused by the radially communicating space included in the protruding portion of the stator coil protruding from the stator core in the axial direction.

[0036] In a different mode of the first disclosed motor, the surrounding wall is formed of a resinous annular member that shrinks by heating.

[0037] In this mode, the surrounding wall can be easily and reliably provided.

[0038] The second disclosure relates to a compressor including a motor.

[0039] The second disclosed compressor includes a compression mechanism portion, a motor that drives the compression mechanism portion, and a hermetic container. The compression mechanism portion and the motor are housed in the hermetic container. The hermetic container includes a suction port and a discharge port. An oil storage portion for storing lubricating oil is provided in the hermetic container. The compression mechanism is configured such that the refrigerant sucked in from the suction port is compressed by the compression mechanism portion and discharged from the discharge port.

[0040] And, as the motor, the above-described motor is used.

[0041] In the second disclosed compressor, it is possible to suppress a decrease in the amount of lubricating oil contained in the mixed gas discharged from the discharge port, which is caused by the radially communicating space included in the protruding portion of the stator coil protruding from the stator core in the axial direction.

[0042] In a different mode of the second disclosed compressor, the electric motor is arranged such that the axial direction is parallel to the vertical direction (including "substantially parallel"). In addition, the electric motor and the compression mechanism section are arranged side by side in the vertical direction. Further, the oil storage section is provided at a position lower than the compression mechanism section.

[0043] In this mode, it is possible to configure a vertical compressor.

[0044] In a different mode of the second disclosed compressor, the electric motor is arranged at a position above the compression mechanism section. The oil storage section is provided at a position lower than the compression mechanism section. The first protruding portion protrudes upward from the stator core, and the second protruding portion protrudes downward from the stator core.

[0045] And a surrounding wall is provided at least outside the first protruding portion.

[0046] This mode can be configured as a vertical compressor with the electric motor arranged above the compression mechanism section.

[0047] In a different mode of the second disclosed compressor, the surrounding wall is formed of a resin-made annular member that shrinks by heating.

[0048] In this mode, it is possible to easily and reliably provide the surrounding wall.

[0049] The third disclosure relates to an air conditioner including a compressor. In the air conditioner of the third invention, the above-described compressor is used as the compressor.

[0050] The air conditioner disclosed in the third has the same effects as the above-described electric motor and compressor.

[0051] Effects of the Invention

[0052] By using the electric motor, compressor, and air conditioner of the present disclosure, it is possible to suppress the influence caused by the radially communicating space included in the protruding portion of the stator coil protruding from the stator core in the axial direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a cross-sectional view of the compressor of the first embodiment.

[0054] Figure 2 It is a view showing a partial enlargement of the stator constituting the electric motor of the first embodiment.

[0055] Figure 3It is a perspective view of the stator of the motor constituting the first embodiment.

[0056] Figure 4 It is a perspective view of the surrounding wall included in the stator of the motor constituting the first embodiment.

[0057] Figure 5 It is a perspective view of the stator of the motor constituting the first embodiment.

[0058] Figure 6 It is a cross-sectional view of the compressor of the second embodiment.

[0059] Figure 7 It is a view of a part of the stator of the motor constituting the second embodiment enlarged.

[0060] Figure 8 It is a perspective view of the stator of the motor constituting the second embodiment.

[0061] Figure 9 It is a perspective view of the stator of the motor constituting the second embodiment.

[0062] Figure 10 It is observed from the X-X line direction Figure 9 and obtained cross-sectional view.

[0063] Description of Reference Numerals

[0064] 100, 500, compressor;

[0065] 110, 510, closed container;

[0066] 111, 511, inner peripheral surface of the closed container;

[0067] 112, 512, suction port;

[0068] 113, 513, discharge port;

[0069] 120, 520, compression mechanism part;

[0070] 121, 521, cylinder block;

[0071] 122, 522, eccentric rotor;

[0072] 123, 523, compression chamber;

[0073] 124, 125, 524, 525, bearing;

[0074] 126, 526, oil storage part;

[0075] 130, 530, pressure accumulator;

[0076] 131, 531, Suction pipe;

[0077] 200, 600, Electric motor;

[0078] 300, 700, Stator;

[0079] 310, 710, Stator core;

[0080] 310A, 310B, 710A, 710B, Stator core end face;

[0081] 310a, 710a, Inner space of stator core;

[0082] 311, 711, Outer peripheral surface of stator core;

[0083] 312, 712, Yoke;

[0084] 313, 713, Tooth;

[0085] 314, 714, Tooth base;

[0086] 315, 715, Tooth tip;

[0087] 316, 716, Tooth tip face;

[0088] 317, 717, Slot;

[0089] 340, 740, Stator coil;

[0090] 340A, 340B, 740A, 740B, Protruding part;

[0091] 340U1, 340V1, 340W1, 740U1, 740V1, 740W1, Power connection terminal;

[0092] 341, 741, Space;

[0093] 350, 360, 750, 760, Enclosing wall;

[0094] 350a, 360a, 750a, 760a, Inner space of annular member;

[0095] 351, 361, 751, 761, Annular member;

[0096] 351a, 361a, 751a, 761a, Inner peripheral surface of annular member;

[0097] 351b, 361b, 751b, 761b, Outer peripheral surface of annular member;

[0098] 400, Rotor;

[0099] 410. Rotor core;

[0100] 420. End plate;

[0101] 430. Riveting pin;

[0102] 440. Rotating shaft;

[0103] 720, 730. Electrical insulator assembly;

[0104] 721. Outer wall part;

[0105] 721a. Outer peripheral surface of the outer wall part;

[0106] 721b. Inner peripheral surface of the outer wall part;

[0107] 722. Inner wall part;

[0108] 723. Main body part;

[0109] 721A, 721B, 721C. Groove;

[0110] 731D. Notch. Detailed implementation mode

[0111] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0112] In this specification, the extending direction of the axis P is referred to as the "axis direction". When the rotor is rotatably disposed in the stator, the axis P corresponds to the rotation center line of the rotor (rotating shaft).

[0113] In addition, the circumferential direction centered on the axis P is referred to as the "circumferential direction".

[0114] In addition, when viewed from the side of the extending direction of the axis, the extending direction of the line passing through the axis P is referred to as the "radial direction". The description such as "radial inner side" indicates the side of the axis P in the radial direction, and the description such as "radial outer side" indicates the side opposite to the axis P in the radial direction.

[0115] In addition, for the electrical insulator assembly (the first electrical insulator assembly, the second electrical insulator assembly) and the surrounding wall (the first surrounding wall, the second surrounding wall), the descriptions of "axis direction", "circumferential direction" and "radial direction" indicate the "axis direction", "circumferential direction" and "radial direction" in the state of being disposed in the stator core.

[0116] First, refer to Figure 1 The first embodiment of the compressor of the present disclosure will be described. Figure 1 It is a cross-sectional view of the compressor 100 of the first embodiment.

[0117] In addition, the motor 200 that constitutes the compressor 100 of the first embodiment is the first embodiment of the motor of the present disclosure.

[0118] The compressor 100 is composed of a hermetic container 110, a compression mechanism section 120, a pressure accumulator 130, a motor 200, and the like.

[0119] The hermetic container 110 has an inner peripheral surface 111 of the hermetic container. An inner space of the hermetic container is formed by the inner peripheral surface 111 of the hermetic container.

[0120] The compression mechanism section 120 and the motor 200 are housed in the inner space of the hermetic container. The compressor 100 of the present embodiment is configured as a vertical compressor in which the motor 200 and the compression mechanism section 120 are arranged in the vertical direction. Further, it is configured as a vertical compressor in which the motor 200 is disposed at a position above the compression mechanism section 120. In addition, it can also be configured as a vertical compressor in which the motor 200 is disposed below the compression mechanism section 120.

[0121] In the hermetic container 110, a suction port 112 is provided below the motor 200, and a discharge port 113 is provided above the motor 200. Further, an oil storage section 126 is provided at the bottom of the hermetic container (below the compression mechanism section 120), and lubricating oil supplied to the sliding sections (for example, bearing sections 124, 125) of the compression mechanism section 120 is stored in the oil storage section 126.

[0122] The compression mechanism section 120 compresses a refrigerant that transfers heat energy. In the present embodiment, as the refrigerant, a natural refrigerant having a small global warming potential (GWP: Grobal Warming Potential) is used, and in particular, carbon dioxide that is non-toxic and non-flammable is used. Of course, various refrigerants other than carbon dioxide can also be used. In addition, when carbon dioxide is used as the refrigerant, the inside of the hermetic container 110 becomes high temperature and high pressure compared to the case of using a refrigerant such as a chlorofluorocarbon refrigerant. Therefore, a lubricating oil having a high viscosity is used as the lubricating oil.

[0123] In the present embodiment, a rotary type compression mechanism section is used as the compression mechanism section 120. Of course, compression mechanism sections having various other structures can also be used.

[0124] The compression mechanism section 120 is composed of a cylinder block 121, an eccentric rotor 122 that rotates through a rotating shaft 440, and a compression chamber 123. The rotating shaft 440 is supported by a bearing section 124 and a bearing section 125 so as to be rotatable.

[0125] When the eccentric rotor 122 of the compression mechanism section 120 rotates through the rotation of the rotating shaft 440, the refrigerant sucked from the suction port 112 is compressed (pressurized) in the compression chamber 123.

[0126] The refrigerant compressed by the compression mechanism unit 120 is mixed with particulate lubricating oil. Then, the mixed gas containing the compressed refrigerant and particulate lubricating oil flows in the gap 210 between the stator 300 and the rotor 400 and is discharged from the discharge port 113.

[0127] The accumulator 130 separates the refrigerant and the lubricating oil contained in the mixed gas discharged from the discharge port 113. The refrigerant separated from the mixed gas in the accumulator 130 returns to the compression mechanism unit 120 via the suction pipe 131 and the suction port 112. In addition, the lubricating oil separated from the mixed gas in the accumulator 130 returns to the oil storage unit 126.

[0128] In addition, by the rotation of the rotating shaft 440, the lubricating oil stored in the oil storage unit 126 is supplied to the sliding portion etc. of the compression mechanism unit 120. The lubricating oil that has lubricated the sliding portion etc. of the compression mechanism unit 120 returns to the oil storage unit 126.

[0129] The mixed gas flowing upward through the gap 210 of the motor 200 is cooled when it comes into contact with the inner peripheral surface 111 of the closed container etc. When the mixed gas is cooled, the lubricating oil contained in the mixed gas is separated. A part of the separated lubricating oil flows downward (falls) through the gap 210 of the motor 200 and returns to the oil storage unit 126. The remaining part of the separated lubricating oil adheres to the inner peripheral surface 111 of the closed container etc.

[0130] Next, refer to Figures 2 to 5 Explain the structure of the motor 200. Figure 2 It is a diagram showing a partial enlargement of the stator 300 constituting the motor 200. Figure 3 It is a perspective view of the stator 300 in a state where the first surrounding wall 350 and the second surrounding wall 360 are not arranged. Figure 4 It is a perspective view of the first surrounding wall 350 and the second surrounding wall 360. Figure 5 It is a perspective view of the stator 300 in a state where the first surrounding wall 350 and the second surrounding wall 360 are arranged.

[0131] As the motor 200 of the present embodiment, a permanent magnet motor in which a permanent magnet is inserted into a magnet insertion hole formed in a rotor is used.

[0132] The motor 200 is composed of a stator 300, a rotor 400, etc.

[0133] The stator 300 includes a stator core 310 and a stator coil 340.

[0134] The stator core 310 is composed of a stack formed by laminating a plurality of plate-shaped electromagnetic steel sheets. The stator core 310 is formed in a cylindrical shape extending in the axial direction (X direction), and has a stator core outer peripheral surface 311 and a stator core inner peripheral surface 316. The stator core inner peripheral surface 316 forms a stator core inner space with the axis P as the center line. A rotor 400 (rotor core 410) is rotatably disposed within the stator core inner space. In the present embodiment, the stator core 310 is disposed such that the axial direction (X direction) is parallel (including "substantially parallel") to the vertical direction.

[0135] In addition, the stator core 310 has a stator core end face 310A on the first side (X1 side) (upper side in the present embodiment) along the axial direction, and a stator core end face 310B on the second side (X2 side) (lower side in the present embodiment) along the axial direction.

[0136] As Figure 2 shown, when viewed from one side in the axial direction, the stator core 310 has a yoke 312 and a plurality of teeth 313.

[0137] The yoke 312 extends in the circumferential direction. The plurality of teeth 313 are arranged at circumferentially separated positions and extend radially inward (toward the axis P side) from the yoke 312. The tooth 313 has a tooth base 314 and a tooth tip 315. The tooth base 314 extends radially inward from the yoke 312. The tooth tip 315 is provided at the tip portion on the radially inner side (axis P side) of the tooth base 314 and extends in the circumferential direction. A tooth tip surface 316 is formed on the radially inner side of the tooth tip 315. The stator core inner space for disposing the rotor 400 (rotor core 410) is formed by the tooth tip surface 316. That is, the stator core inner peripheral surface is formed by the tooth tip surface 316.

[0138] A slot 317 is formed by the teeth 313 adjacent in the circumferential direction.

[0139] In the present embodiment, the stator core 310 is disposed within the inner space of the sealed container in a state where the stator core outer peripheral surface 311 abuts against the inner peripheral surface 111 of the sealed container.

[0140] The stator coil 340 is wound around each tooth 313. In the present embodiment, the stator coil 340 is wound around each tooth 313 in a distributed winding manner.

[0141] The stator coil 340 includes an insertion portion inserted into the slot 317, a first protruding portion 340A protruding from the stator core 310, and a second protruding portion 340B. The first protruding portion 340A protrudes from the stator core 310 toward the first side (arrow X1 side: upper side) along the axial direction. The second protruding portion 340B protrudes from the stator core 310 toward the second side (arrow X2 side: lower side) along the axial direction.

[0142] In addition, the ends of the wires of the stator coils constituting each phase are led out as power connection terminals. For example, the ends of the wires of the U-phase stator coil, V-phase stator coil, and W-phase stator coil are led out as power connection terminals 340U1, 340V1, and 340W1.

[0143] The rotor 400 includes a rotor core 410 and a rotating shaft 440.

[0144] The rotor core 410 is formed of a laminate obtained by laminating a plurality of plate-shaped electromagnetic steel sheets. The rotor core 410 is formed in a cylindrical shape extending in the axial direction (X direction), and has a rotor core outer peripheral surface 411 and a rotor core inner peripheral surface 412. The rotor core inner space is formed by the rotor core inner peripheral surface 412.

[0145] The rotating shaft 440 is inserted into the rotor core inner space by press-fitting or the like.

[0146] The rotor core 410 is rotatably disposed in the stator core inner space such that the center line of the rotating shaft 440 coincides with the axis P (including "substantially coincides").

[0147] By disposing the rotor core 410 in the stator core inner space, a gap 210 is formed between the stator core inner peripheral surface (tooth tip surface) 316 and the rotor core outer peripheral surface 411.

[0148] In addition, end plates 420 are disposed on both sides in the axial direction in a state where a plurality of electromagnetic steel sheets are laminated. And by inserting riveting pins 430 into the riveting pin insertion holes formed in each electromagnetic steel sheet and the end plates 420, a laminate is formed in a state where the electromagnetic steel sheets are aligned.

[0149] In addition, a plurality of magnet insertion holes for inserting permanent magnets are formed in the rotor core 410, and illustration thereof is omitted. The number and shape of the magnet insertion holes and the permanent magnets are appropriately set.

[0150] Here, as Figure 3 shown, the first protruding portion 340A and the second protruding portion 340B of the stator coil 340 include a space 341 communicating in the radial direction at appropriate positions along the circumferential direction. This space 341 is defined as a space where the wires constituting the stator coil 340 do not exist. That is, when the stator coil 340 (specifically, the wires constituting the stator coil 340) is wound around each tooth 313, spaces 341 communicating in the radial direction and without wires are formed on the first side and the second side along the axial direction of the stator core 310.

[0151] Due to the space 341 included in the first protruding portion 340A and the second protruding portion 340B, the flow of the mixed gas through the clearance 210 of the motor 200 is disturbed. For example, a part of the mixed gas flows into the space 341 included in the second protruding portion 340B, whereby the amount of the mixed gas flowing through the clearance 210 of the motor 200 (the amount of lubricating oil included in the mixed gas) is reduced. In addition, a part of the mixed gas that has passed through the clearance 210 of the motor 200 flows into the space 341 included in the first protruding portion 340A, whereby the amount of the mixed gas discharged from the discharge port 113 (the amount of lubricating oil included in the mixed gas) is reduced.

[0152] In the present embodiment, in order to suppress the influence (the disturbance of the flow of the mixed gas) caused by the space 341 included in the first protruding portion 340A and the second protruding portion 340B, a first surrounding wall 350 is disposed outside the first protruding portion 340A, and a second surrounding wall 360 is disposed outside the second protruding portion 340B.

[0153] Refer to Figure 4 The structure of the first surrounding wall 350 will be described.

[0154] The first surrounding wall 350 is constituted by an annular member 351 that can surround the outside of the first protruding portion 340A.

[0155] The annular member 351 extends without a gap in the axial direction and in the circumferential direction centered on the center point 350a, and has an annular member inner peripheral surface 351a and an annular member outer peripheral surface 351b.

[0156] The annular member 351 is formed of a material having insulating properties. As the material having insulating properties, various known materials can be used. As a method of disposing the annular member 351 outside the first protruding portion 340A, various methods can be used.

[0157] In the present embodiment, the annular member 351 is formed of a resin that shrinks by heating into a resin-made annular member. As the resin that shrinks by heating, various known resins can be used. The thickness of the annular member 351 is set within the range of 0.07 mm to 0.5 mm.

[0158] Moreover, in the present embodiment, the annular member 351 is heated in a state where the annular member 351 is disposed outside the first protruding portion 340A. The annular member 351 is heated and shrinks. By the shrinkage of the annular member 351, the annular member 351 closely adheres to the entire outside of the first protruding portion 340A. Thereby, the annular member 351 (the first surrounding wall 350) can be easily and firmly disposed outside the first protruding portion 340A.

[0159] By the annular member 351 closely adhering to the entire outer side of the first protruding portion 340A, the radially outer side of the space 341 included in the first protruding portion 340A is blocked.

[0160] By the space 341 included in the first protruding portion 340A being blocked, it is possible to prevent the axial flow of the mixed gas passing through the gap 210 of the motor 200 from being disturbed by the space 341 included in the first protruding portion 340A. That is, it is possible to suppress the decrease in the amount of the mixed gas flowing from the gap 210 of the motor 200 to the discharge port 113. Thereby, it is possible to suppress the decrease in the amount of lubricating oil included in the mixed gas discharged from the discharge port 113.

[0161] As Figure 4 shown, the second surrounding wall 360 is formed of an annular member 361 in the same manner as the first surrounding wall 350. The annular member 361 is formed of the same material as the annular member 351.

[0162] In addition, the shape and size of the annular member 361 constituting the second surrounding wall 360 may be the same as or different from the shape and size of the annular member 351 constituting the first surrounding wall 350.

[0163] By disposing the annular member 361 on the outer side of the second protruding portion 340B, the radially outer side of the space 341 included in the second protruding portion 340B is blocked.

[0164] Thereby, it is possible to prevent the axial flow of the mixed gas toward the gap 210 of the motor 200 from being disturbed by the space 341 included in the second protruding portion 340B. That is, it is possible to suppress the decrease in the amount of lubricating oil included in the mixed gas flowing through the gap 210 of the motor 200.

[0165] In the present embodiment, the first surrounding wall 350 is provided on the outer side of the first protruding portion 340A, and the second surrounding wall 360 is provided on the outer side of the second protruding portion 340B.

[0166] Thereby, it is possible to prevent the axial flow of the mixed gas containing the refrigerant and the lubricating oil from being disturbed by the space 341 included in the first protruding portion 340A and the space 341 included in the second protruding portion 340B. It is possible to increase the amount of lubricating oil included in the mixed gas discharged from the discharge port, and thereby increase the return amount of the lubricating oil from the accumulator 130.

[0167] In addition, it is possible to prevent the first protruding portion 340A and the second protruding portion 340B from coming into contact with other electrical components via the space 341 and causing insulation failure.

[0168] In addition, surrounding walls are respectively provided on the outer sides of the first protruding portion 340A and the second protruding portion 340B, but the surrounding walls can also be provided on the outer sides of at least one of the protruding portions. In this case, it is preferable to provide the surrounding walls on the protruding portions on the side where the power connection terminals of each phase are led out. In the present embodiment, it is preferable to provide the surrounding wall on the outer side of the first protruding portion 340A.

[0169] Next, Figure 6 a second embodiment of the compressor according to the present disclosure will be described. Figure 6 is a cross-sectional view of the compressor 500 according to the second embodiment.

[0170] In addition, the motor 600 constituting the compressor 500 according to the second embodiment is a second embodiment of the motor according to the present disclosure.

[0171] Similar to the compressor 100 according to the first embodiment, the compressor 500 according to the second embodiment includes a hermetic container 510, a compression mechanism portion 520, a motor 600, and a pressure accumulator 530.

[0172] Since the hermetic container 510, the compression mechanism portion 520, and the pressure accumulator 530 of the compressor 500 according to the second embodiment have the same structures as the hermetic container 110, the compression mechanism portion 120, and the pressure accumulator 130 of the compressor 100 according to the first embodiment, the description thereof will be omitted.

[0173] The motor 600 is different from the above-described motor 200 in that the stator 700 includes a first electrical insulator assembly 720 and a second electrical insulator assembly 730.

[0174] Refer to Figures 7 to 10 to describe the structure of the motor 600. Figure 7 is a diagram showing a partial enlargement of the stator 700 constituting the motor 600. Figure 8 is a perspective view of the stator 700 in a state where the first surrounding wall 750 and the second surrounding wall 760 are not provided. Figure 9 is a perspective view of the stator 700 in a state where the first surrounding wall 750 and the second surrounding wall 760 are provided. Figure 10 is a cross-sectional view obtained by observing in the direction of the arrow X-X line Figure 9

[0175] In the present embodiment, a permanent magnet motor is used as the motor 600.

[0176] The motor 600 includes a stator 700, a rotor 800, and the like.

[0177] Since the rotor 800 has the same structure as the rotor 400 of the above-described motor 200, the description thereof will be omitted.

[0178] ​The stator 700 includes a stator core 710, a first electrical insulator assembly 720, a second electrical insulator assembly 730, and a stator coil 740.

[0179] The stator core 710 is configured in the same manner as the above-described stator core 310.

[0180] The stator core 710 is formed in a cylindrical shape extending in the axial direction, and has a stator core outer peripheral surface 711 and a stator core inner peripheral surface 716.

[0181] In addition, the stator core 710 has a stator core end face 710A on the first side (upper side) in the axial direction and a stator core end face 710B on the second side (lower side).

[0182] In addition, as Figure 7 shown, the stator core 710 has a yoke 712 and a plurality of teeth 713. The teeth 713 have tooth bases 714 and tooth tip portions 715. A tooth tip face 716 is formed at the tooth tip portion 715. The stator core inner space is formed by the tooth tip face 716.

[0183] The stator core 710 is disposed in the inner space of the sealed container in a state where the stator core outer peripheral surface 711 abuts against the inner peripheral surface 511 of the sealed container.

[0184] The first electrical insulator assembly 720 is formed of a resin having insulating properties. As Figure 8 shown, the first electrical insulator assembly 720 has a first outer wall portion 721, a plurality of first inner wall portions 722, and a plurality of first main body portions 723.

[0185] The first outer wall portion 721 extends in the axial direction and the circumferential direction. The plurality of first inner wall portions 722 are disposed at positions radially inside (on the side of the axis P) of the first outer wall portion 721 at circumferentially separated positions, and extend in the axial direction and the circumferential direction. The plurality of first main body portions 723 are provided between the first outer wall portion 721 and the plurality of first inner wall portions 722, and extend in the radial direction.

[0186] The first outer wall portion 721 has a first outer wall portion outer peripheral surface 721a and a first outer wall portion inner peripheral surface 721b.

[0187] Grooves 721A to 721C extending in the circumferential direction are formed in the first outer wall portion outer peripheral surface 721a (refer to Figure 10 ). Conductors 740u, 740v, 740w (referred to as "jumper wires") that form the coils of the U-phase, V-phase, and W-phase and are wound around the first outer wall portion outer peripheral surface 721a are inserted into the grooves 721A to 721C. The grooves 721A to 732C prevent the conductors 740u, 740v, 740w from contacting each other.

[0188] In addition, a notch 721D is formed in the first outer wall portion 721 and opens at the outer peripheral surface 721a and the inner peripheral surface 721b of the first outer wall portion. The notch 721D is used when the wires 740u, 740v, and 740w are lapped across the first outer wall portion 721 from the radially inner side to the radially outer side or from the radially outer side to the radially inner side.

[0189] The first electrical insulator assembly 720 is arranged on the first side (the side of the stator core end face 710A) along the axis direction of the stator core 710 in such a manner that the first outer wall portion 721, each first main body portion 723, and each first inner wall portion 722 face the yoke 712, each tooth base portion 714, and each tooth tip portion 715 respectively (see Figure 7 ). In addition, there is also a case where the first outer wall portion 721 and each first main body portion 723 are arranged opposite to the yoke 712 and each tooth 713 respectively.

[0190] The second electrical insulator assembly 730 has a second outer wall portion 731, a plurality of second inner wall portions 732, and a plurality of second main body portions 733 in the same manner as the first electrical insulator assembly 720.

[0191] The second electrical insulator assembly 730 is arranged on the second side (the side of the stator core end face 710B) along the axis direction of the stator core 710 in such a manner that the second outer wall portion 731, each second main body portion 733, and each second inner wall portion 732 face the yoke 712, each tooth base portion 714, and each tooth tip portion 715 respectively. In addition, there is also a case where the second outer wall portion 731 and each second main body portion 733 are arranged corresponding to the yoke 712 and each tooth 713 respectively.

[0192] As the second electrical insulator assembly 730, the first electrical insulator assembly 720 can also be used (doubly used).

[0193] In addition, on the second side of the stator core 710 along the axis direction, when the wire is not wound around the outer peripheral surface 731a of the second outer wall portion, the groove on the outer peripheral surface 731a of the second outer wall portion and the notch of the second outer wall portion 731 can be omitted.

[0194] The stator coil 740 is wound around each tooth 713 of the first main body portion 723 on which the first electrical insulator assembly 720 is arranged on the first side in the axis direction and the second main body portion 733 on which the second electrical insulator assembly 730 is arranged on the second side in the axis direction.

[0195] In the present embodiment, the stator coil 740 is wound around each tooth 713 in a concentrated winding manner.

[0196] In the present embodiment, similar to the first embodiment, as Figure 8As shown, the first protruding portion 740A and the second protruding portion 740B of the stator coil 740 include a space 741 that communicates radially at appropriate positions along the circumferential direction.

[0197] In addition, a notch 721D is formed in the outer wall portion 721 of the first electrical insulator assembly 720. A notch 731D (not shown) is formed in the outer wall portion 731 of the second electrical insulator assembly 730.

[0198] Therefore, the space 741 included in the first protruding portion 740A communicates radially with the notch 721D formed in the outer wall portion 721 of the first electrical insulator assembly 720. In addition, the space 741 included in the second protruding portion 740B communicates radially with the notch 731D formed in the outer wall portion 731 of the second electrical insulator assembly 730.

[0199] In this case, as described above, due to the space 741 included in the first protruding portion 740A and the notch 721D formed in the outer wall portion 721 of the first electrical insulator assembly 720, and the space 741 included in the second protruding portion 740B and the notch 731D formed in the outer wall portion 731 of the second electrical insulator assembly 730, the flow of the mixed gas along the axial direction is disturbed.

[0200] In the present embodiment, a first surrounding wall 750 is disposed outside the first outer wall portion 721 of the first electrical insulator assembly 720, which is disposed outside the first protruding portion 740A. In addition, a second surrounding wall 760 is disposed outside the second outer wall portion 731 of the second electrical insulator assembly 730, which is disposed outside the second protruding portion 740B.

[0201] The first surrounding wall 750 and the second surrounding wall 760 are composed of annular members 751 and 761, similarly to the first surrounding wall 350. The annular members 751 and 761 are formed of the same material as the annular member 351.

[0202] By disposing the annular member 751 outside the first outer wall portion 721 of the first electrical insulator assembly 720, the space 741 included in the first protruding portion 740A is blocked.

[0203] Thereby, it is possible to prevent the flow of the mixed gas along the axial direction passing through the gap 610 of the motor 600 from being disturbed by the space 741 included in the first protruding portion 740A. That is, it is possible to suppress a decrease in the amount of lubricating oil contained in the mixed gas discharged from the discharge port 513.

[0204] In addition, by disposing the annular member 761 outside the second outer wall portion 731 of the second electrical insulator assembly 730, the space 741 included in the second protruding portion 740B is blocked.

[0205] Thus, it is possible to prevent the axial flow of the mixed gas toward the gap 610 of the electric motor 600 from being disturbed by the space 741 included in the second protruding portion 740B. That is, it is possible to suppress a decrease in the amount of lubricating oil contained in the mixed gas flowing through the gap 610 of the electric motor 600.

[0206] Figure 10 The state where the first surrounding wall 750 is disposed outside the first outer wall portion 721 of the first electrical insulator assembly 720 is shown.

[0207] As Figure 10 shown, the first surrounding wall 750 is disposed radially outside the wires 740u to 740w inserted into the grooves 721A to 721C formed in the outer peripheral surface 721a of the first outer wall portion of the first electrical insulator assembly 720. Thus, it is possible to prevent the wires 740u to 740w from coming into contact with other electrical components.

[0208] Similarly, a second surrounding wall 760 is disposed radially outside the wires inserted into the grooves formed in the outer peripheral surface of the second outer wall portion of the second electrical insulator assembly 730.

[0209] In the present embodiment, the first surrounding wall 750 is provided outside the first outer wall portion 721 of the first electrical insulator assembly 720, and the second surrounding wall 760 is provided outside the second outer wall portion 731 of the second electrical insulator assembly 730.

[0210] Thus, it is possible to prevent the axial flow of the mixed gas containing the refrigerant and the lubricating oil from being disturbed by the space 741 included in the first protruding portion 740A and the space 741 included in the second protruding portion 740B.

[0211] In addition, it is possible to prevent insulation failure from occurring due to contact between the wires inserted into the grooves formed in the outer peripheral surface 721a of the first outer wall portion of the first electrical insulator assembly 720 and the wires inserted into the grooves formed in the outer peripheral surface 731a of the second outer wall portion of the second electrical insulator assembly 730 and other electrical components.

[0212] In addition, although the surrounding walls are respectively provided outside the first outer wall portion 721 of the first electrical insulator assembly 720 and outside the second outer wall portion 731 of the second electrical insulator assembly 730, it is also possible to provide a surrounding wall outside at least one outer wall portion. In this case, it is preferable to provide a surrounding wall at the protruding portion on the side where the power connection terminals of each phase are led out. In the present embodiment, it is preferable to provide a surrounding wall outside the first outer wall portion 721 of the first electrical insulator assembly 720.

[0213] The compressor of the present disclosure can be used for various purposes.

[0214] For example, it can be used as a compressor for an air conditioner. The air conditioner includes household air conditioners, commercial air conditioners, vehicle-mounted air conditioners, etc.

[0215] Household air conditioners are used in ordinary residences, collective housing, etc.

[0216] Commercial air conditioners are used in offices, stores, etc.

[0217] Vehicle-mounted air conditioners are used in automobiles. For example, they are used in environmentally friendly cars (Ecologically-Friendly Car) such as electric vehicles (EV), hybrid vehicles (HV), and fuel cell vehicles (FCV) with low exhaust gas emissions.

[0218] The present disclosure can also be configured as follows.

[0219] (Mode 1) A motor including a stator and a rotor,

[0220] The stator includes a stator core and a stator coil,

[0221] The stator core is formed in a cylindrical shape extending along the axial direction, and has a yoke extending along the circumferential direction and a plurality of teeth arranged separately along the circumferential direction and extending radially inward from the yoke,

[0222] The stator coils are respectively wound around the plurality of teeth,

[0223] The feature of this motor is that,

[0224] The stator coil includes a first protruding portion protruding toward the first side along the axial direction more than the stator core and a second protruding portion protruding toward the second side,

[0225] On the outer side of at least one of the first protruding portion and the second protruding portion, there is a surrounding wall extending without a gap along the axial direction and the circumferential direction.

[0226] (Mode 2) The motor according to Mode 1, characterized in that,

[0227] The stator includes a first electrical insulator assembly and a second electrical insulator assembly,

[0228] The first electrical insulator assembly has a first outer wall portion extending along the axial direction and the circumferential direction, and a plurality of first main portions arranged at circumferentially separated positions and extending radially inward from the first outer wall portion. In addition, on the first side of the stator core along the axial direction, the first outer wall portion is opposed to the yoke and the plurality of first main portions are respectively opposed to the plurality of teeth,

[0229] The second electrical insulator assembly has a second outer wall portion extending along the axial direction and the circumferential direction, and a plurality of second main portions arranged at positions separated along the circumferential direction and extending radially inward from the second outer wall portion. Further, on the second side of the stator core along the axial direction, the second outer wall portion faces the yoke and the plurality of second main portions face the plurality of teeth respectively.

[0230] The stator coils are respectively wound around the plurality of teeth on which the first main portions and the second main portions are arranged on the first side and the second side along the axial direction.

[0231] At least one notch that opens on the outer peripheral surface and the inner peripheral surface of the outer wall portion is formed in at least one of the first outer wall portion of the first electrical insulator assembly and the second outer wall portion of the second electrical insulator assembly.

[0232] The surrounding wall is provided outside the at least one outer wall portion.

[0233] (Mode 3) The motor according to Mode 1 or 2, characterized in that

[0234] The surrounding wall is formed of a resin-made annular member that shrinks by heating.

[0235] (Mode 4) A compressor includes a compression mechanism portion, a motor that drives the compression mechanism portion, and a hermetic container. The compression mechanism portion and the motor are housed in the hermetic container. The hermetic container includes a suction port and a discharge port. An oil storage portion for storing lubricating oil is provided in the hermetic container. The refrigerant sucked from the suction port is compressed by the compression mechanism portion and discharged from the discharge port.

[0236] The compressor is characterized in that

[0237] As the motor, the motor according to any one of Modes 1 to 3 is used.

[0238] (Mode 5) The compressor according to Mode 4, characterized in that

[0239] The motor is arranged such that the axial direction is parallel to the vertical direction.

[0240] The motor and the compression mechanism portion are arranged side by side along the vertical direction.

[0241] The oil storage portion is provided at a position lower than the compression mechanism portion.

[0242] (Mode 6) The compressor according to Mode 5, characterized in that

[0243] The motor is disposed at a position above the compression mechanism section.

[0244] The first protruding portion protrudes upward from the stator core.

[0245] The second protruding portion protrudes downward from the stator core.

[0246] The surrounding wall is provided on the outer side of at least the first protruding portion among the first protruding portion and the second protruding portion.

[0247] (Mode 7) An air conditioner includes a compressor.

[0248] This air conditioner is characterized in that

[0249] As the compressor, the compressor described in any one of Modes 4 to 6 is used.

[0250] The structure of the present disclosure is not limited to the structure described in the embodiments, but various changes, additions, and deletions can be made.

[0251] In the embodiments, a vertical compressor in which the motor is disposed above the compression mechanism section is described, but the compressor of the present disclosure can also be configured as a vertical compressor in which the motor is disposed below the compression mechanism section.

[0252] In the embodiments, a vertical compressor is described, but the present disclosure can also be configured as a horizontal compressor in which the compression mechanism section and the motor are arranged and disposed in the horizontal direction (including "substantially horizontal direction").

[0253] As the compression mechanism section, a compression mechanism section having various structures can be used.

[0254] As the motor for driving the compression mechanism section, a motor having various structures including a stator and a rotor can be used.

[0255] In the embodiments, a stator core having teeth including a tooth base portion and a tooth tip portion is used, but a stator core having teeth including only the tooth base portion can also be used. In this case, a first electrical insulator assembly (second electrical insulator assembly) having an outer wall portion and a plurality of main body portions can be used.

[0256] The shape of the surrounding wall and the material forming the surrounding wall can be appropriately changed.

[0257] Each structure described in the embodiments can be used alone or a plurality of appropriately selected structures can be used in combination.

Claims

1. An electric motor comprising a stator and a rotor, The stator comprises a stator core and a stator coil. The stator core is formed in a cylindrical shape extending in the axial direction, and has a yoke extending in the circumferential direction and a plurality of teeth arranged separately in the circumferential direction and extending radially inward from the yoke. The stator coils are respectively wound around the plurality of teeth. The electric motor is characterized in that The stator coil includes a first protruding portion protruding toward a first side and a second protruding portion protruding toward a second side along the axial direction relative to the stator core. A surrounding wall extending without a gap in the axial direction and the circumferential direction is provided on the outer side of at least one of the first protruding portion and the second protruding portion.

2. The electric motor according to claim 1, characterized in that The stator comprises a first electrical insulator component and a second electrical insulator component, The first electrical insulator assembly includes a first outer wall portion extending along the axial direction and the circumferential direction, and a plurality of first main body portions arranged at positions separated along the circumferential direction and extending radially inward from the first outer wall portion, and further, the first side of the stator core along the axial direction is arranged such that the first outer wall portion is opposite to the yoke and the plurality of first main body portions are respectively opposite to the plurality of teeth. The second electrical insulator assembly has a second outer wall portion extending along the axial direction and the circumferential direction, and a plurality of second main body portions arranged at positions separated along the circumferential direction and extending radially inward from the second outer wall portion, and is arranged on the second side of the stator core along the axial direction so that the second outer wall portion is opposite to the yoke and the plurality of second main body portions are respectively opposite to the plurality of teeth. The stator coil is wound around the plurality of teeth on which the first body portion and the second body portion are arranged on the first side and the second side along the axial direction, respectively. At least one outer wall portion of the first outer wall portion of the first electrical insulator assembly and the second outer wall portion of the second electrical insulator assembly is formed with at least one notch opening on an outer peripheral surface of the outer wall portion and an inner peripheral surface of the outer wall portion, The surrounding wall is arranged outside the at least one outer wall portion.

3. The electric motor according to claim 1 or 2, characterized in that: The surrounding wall is formed of a resin annular member that shrinks when heated.

4. A compressor comprising a compression mechanism, a motor for driving the compression mechanism, and a sealed container, wherein the compression mechanism and the motor are accommodated in the sealed container, the sealed container comprises a suction port and a discharge port, an oil storage portion for storing lubricating oil is provided in the sealed container, and the refrigerant sucked from the suction port is compressed by the compression mechanism and discharged from the discharge port, The compressor is characterized in that As the electric motor, the electric motor according to claim 1 or 2 is used.

5. The compressor according to claim 4, characterized in that The motor is arranged in such a manner that the axial direction is parallel to the vertical direction. The motor and the compression mechanism are arranged side by side along the vertical direction. The oil storage portion is provided below the compression mechanism portion.

6. The compressor according to claim 5, characterized in that The electric motor is arranged above the compression mechanism. The first protruding portion protrudes upward from the stator core, The second protruding portion protrudes downward from the stator core, The surrounding wall is provided on the outer side of at least the first protruding portion of the first protruding portion and the second protruding portion.

7. The compressor according to claim 4, characterized in that The surrounding wall is formed of a resin annular member that shrinks when heated.

8. An air conditioner comprising a compressor, The air conditioner is characterized in that As the compressor, the compressor according to claim 4 is used.

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