Electric compressor

Abstract

The present invention relates to an electric compressor comprising: a motor for generating power; a compression mechanism for receiving power from the motor and compressing a refrigerant; an inverter for controlling the motor; and a cover for covering an inverter accommodation space in which the inverter is accommodated, wherein the inverter includes a substrate, a sleeve mounted on the substrate, and a connector inserted into the sleeve and connected to an external device, the cover includes an outer cover exposed to the outside and an inner cover facing the inverter accommodation space, and the inner cover includes a sleeve fixing part for fixing the sleeve, and thus can prevent short circuits.

Description

electric compressor

[0001] The present invention relates to an electric compressor, and more specifically, to an electric compressor capable of compressing a refrigerant using the driving force of a motor controlled by an inverter.

[0002] Generally, a compressor is a device that compresses fluids such as refrigerant gas, and is applied in building air conditioning systems, vehicle air conditioning systems, and the like.

[0003] The above compressor is classified according to the compression method into a reciprocating compressor that compresses the refrigerant through the reciprocating motion of a piston and a rotary compressor that performs compression while rotating. The above reciprocating compressor is classified according to the power transmission method into a crank-type compressor that transmits power to multiple pistons using a crank, a swashplate-type compressor that transmits power to a drive shaft equipped with a swashplate, etc. The above rotary compressor can be classified into a vane rotary compressor that uses a rotating rotary shaft and vanes, and a scroll compressor that uses a slewing scroll and a fixed scroll.

[0004] In addition, the above compressor may be classified into a mechanical compressor using an engine and an electric compressor using a motor (hereinafter referred to as an electric compressor) depending on the driving method.

[0005] Here, a conventional electric compressor includes a motor that generates power, a compression mechanism that receives power from the motor and compresses the refrigerant, an inverter that controls the motor, and a metal cover that covers an inverter housing space in which the inverter is housed.

[0006] And, as illustrated in FIG. 1, the inverter comprises a substrate (21), a sleeve (22) mounted on the substrate (21), and a connector (23) inserted into the sleeve (22) and connected to an external device, and the sleeve (22) comprises a first sleeve (22a) into which a first pole pin (23a) of the connector (23) is inserted, and a second sleeve (22b) into which a second pole pin (23b) of the connector (23) is inserted, and for insulation between the first sleeve (22a) and the second sleeve (22b), the first sleeve (22a) and the second sleeve (22b) are spaced apart from each other, and the cover (10) is spaced apart from the first sleeve (22a) and the second sleeve (22b).

[0007] However, in such conventional electric compressors, there was a problem in that the substrate (21) would bend due to vibration or sagging, and the first sleeve (22a) and the second sleeve (22b) would come into contact with the cover (10), causing a short circuit.

[0008] Accordingly, the present invention aims to provide an electric compressor capable of preventing short circuits.

[0009] To achieve the above-mentioned purpose, the present invention provides an electric compressor comprising: a motor that generates power; a compression mechanism that receives power from the motor and compresses a refrigerant; an inverter that controls the motor; and a cover that covers an inverter housing space in which the inverter is accommodated; wherein the inverter comprises a substrate, a sleeve mounted on the substrate, and a connector inserted into the sleeve and connected to an external device; the cover comprises an outer cover exposed to the outside and an inner cover facing the inverter housing space; and the inner cover comprises a sleeve fixing part that fixes the sleeve.

[0010] The above-mentioned exterior cover is formed of a metal material, and the above-mentioned interior cover is formed of a resin material, and the above-mentioned exterior cover and the above-mentioned interior cover can be formed by double injection molding.

[0011] The above internal cover may further include a heat-fusion fixing part that is heat-fused to the substrate.

[0012] The sleeve fixing portion includes a post protruding toward the substrate and a recess formed in a recess on the leading edge of the post, and the sleeve may include a protrusion that penetrates the substrate and is inserted into the recess.

[0013] The leading edge of the above post may be formed to support the substrate.

[0014] The sleeve fixing portion may further include an inner rib protruding from the inner circumferential surface of the recess.

[0015] The above inner ribs are formed in plurality, and the plurality of inner ribs may be formed spaced apart from each other along the circumferential direction of the recess.

[0016] At least one of the plurality of inner ribs may be formed such that the distance to the center axis of the recess decreases as it moves away from the leading edge of the post along the axial direction of the recess.

[0017] Each of the plurality of inner ribs includes a gripping point along the axial direction of the recess, which is a point spaced apart from the front end surface of the post by a value equal to the distance between the front end surface of the protrusion and the substrate, and the diameter of a virtual circle perpendicular to the central axis of the recess and tangent to the gripping points of the plurality of inner ribs may be formed to be smaller than or equal to the outer diameter of the front end surface of the protrusion.

[0018] Each of the plurality of inner ribs further includes a guide portion located between the gripping point and the front end surface of the post along the axial direction of the recess, and the diameter of the smallest circle among the virtual circles perpendicular to the central axis of the recess and in contact with the guide portions of the plurality of inner ribs may be formed to be larger than the outer diameter of the front end surface of the protrusion.

[0019] The sleeve fixing portion may further include an outer rib protruding from the outer surface of the post.

[0020] The above outer rib may be formed such that the distance protruding from the outer surface of the post increases as it moves away from the leading edge of the post along the axial direction of the post.

[0021] The above outer ribs are formed in multiple numbers, and the multiple outer ribs may be formed spaced apart from each other along the circumferential direction of the post.

[0022] The sleeve fixing portion further includes an inner rib protruding from the inner surface of the recess, wherein the inner ribs are formed in plurality, the plurality of inner ribs are formed spaced apart from each other along the circumferential direction of the recess, and any one of the plurality of outer ribs may be formed to overlap with one of the plurality of inner ribs in the radial direction of the recess.

[0023] The sleeve is formed in two parts, and the recess includes a first recess into which a protrusion of one of the two sleeves is inserted and a second recess into which a protrusion of the other of the two sleeves is inserted, and the post may include a first recess forming part in which the first recess is formed, a second recess forming part in which the second recess is formed, and a connecting part connecting the first recess forming part and the second recess forming part.

[0024] The substrate includes a substrate hole into which the sleeve is inserted, and the base of the protrusion is formed to have an outer diameter larger than the inner diameter of the substrate hole, and the recess may include an outer portion that receives the base of the protrusion and is formed in a recess on the leading edge of the post, and an inner portion that receives the leading edge of the protrusion and is formed in a recess on the outer portion.

[0025] The inner diameter of the outer portion may be formed larger than the outer diameter of the base portion, and the depth of the outer portion may be formed larger than the height of the base portion.

[0026] An electric compressor according to the present invention comprises: a motor that generates power; a compression mechanism that receives power from the motor and compresses a refrigerant; an inverter that controls the motor; and a cover that covers an inverter housing space in which the inverter is accommodated. The inverter comprises a substrate, a sleeve mounted on the substrate, and a connector inserted into the sleeve and connected to an external device. The cover comprises an outer cover exposed to the outside and an inner cover facing the inverter housing space. The inner cover includes a sleeve fixing part that fixes the sleeve, thereby preventing a short circuit.

[0027] FIG. 1 is a perspective view showing an inverter and a cover in a conventional electric compressor.

[0028] FIG. 2 is a cross-sectional view illustrating an inverter and a cover in an electric compressor according to an embodiment of the present invention.

[0029] FIG. 3 is a front view illustrating the cover of FIG. 2,

[0030] FIG. 4 is a cross-sectional view along line AA of FIG. 3,

[0031] FIG. 5 is a perspective view showing the sleeve fixing part in the cover of FIG. 3.

[0032] FIG. 6 is an enlarged perspective view of the sleeve fixing part of FIG. 5.

[0033] FIG. 7 is a perspective view showing a cutaway sleeve fixing portion of an internal cover in an electric compressor according to another embodiment of the present invention.

[0034] FIG. 8 is an exploded perspective view showing a sleeve and a substrate supported by the sleeve fixing part of FIG. 7.

[0035] FIG. 9 is a cross-sectional view showing a sleeve inserted into the sleeve fixing part of FIG. 8.

[0036] FIG. 10 is a perspective view illustrating a sleeve supported by the sleeve fixing part of FIG. 7 to 9 and a connector connected to a substrate.

[0037] Hereinafter, the electric compressor according to the present invention will be described in detail.

[0038] An electric compressor according to one embodiment of the present invention may include a motor that generates power, a compression mechanism that receives power from the motor and compresses a refrigerant, an inverter that controls the motor, and a cover that covers an inverter housing space in which the inverter is accommodated.

[0039] Here, FIG. 2 is a cross-sectional view showing an inverter and a cover in an electric compressor according to an embodiment of the present invention, FIG. 3 is a front view showing the cover of FIG. 2, FIG. 4 is a cross-sectional view along line AA of FIG. 3, FIG. 5 is a perspective view showing a sleeve fixing part in the cover of FIG. 3, and FIG. 6 is an enlarged perspective view showing the sleeve fixing part of FIG. 5.

[0040] Referring to FIGS. 2 to 6, a cover (100) according to one embodiment of the present invention may include an outer cover (110) made of a metal material that is exposed to the outside and an inner cover (120) made of a resin material that is formed by double injection molding on the inner surface of the outer cover (110).

[0041] And, the inverter includes a substrate (210), an annular sleeve (220) mounted on the substrate (210), and a connector (230) inserted into the sleeve (220) and connected to an external device, and the internal cover (120) facing the inverter receiving space may include a sleeve fixing part (122, 124) for fixing the sleeve (220).

[0042] Specifically, the substrate (210) may include a first surface (212) of the substrate facing the connector (230), a second surface (214) of the substrate forming the back surface of the first surface (212), and a substrate hole (216) penetrating the substrate (210) from the first surface (212) to the second surface (214).

[0043] Furthermore, the sleeve (220) may be inserted into the substrate hole (216), and both ends of the sleeve (220) may be formed to protrude outside the substrate hole (216). That is, the sleeve (220) may include a connector-side protrusion (222) that penetrates the substrate hole (216) and protrudes toward the connector (230) side rather than the first surface (212) of the substrate, and a cover-side protrusion (224) that protrudes toward the cover (100) side rather than the second surface (214) of the substrate.

[0044] And, the sleeve fixing portion (122, 124) may include a post (122) protruding toward the substrate (210) from the surface facing the second surface (214) of the substrate of the internal cover (120), and a recess (124) formed in a recessed manner on the portion of the front surface (F122) of the post (122) facing the sleeve (220) into which the cover side protrusion (224) is inserted.

[0045] Here, the sleeve (220) includes a first sleeve (220a) into which the first pole pin (232) of the connector (230) is inserted and a second sleeve (220b) into which the second pole pin (234) of the connector (230) is inserted, and the recess (124) includes a first recess (124a) into which the cover-side protrusion (224) of the first sleeve (220a) is inserted and a second recess (124b) into which the cover-side protrusion (224) of the second sleeve (220b) is inserted, and the post (122) includes a first recess forming part (122a) into which the first recess (124a) is formed, a second recess forming part (122b) into which the second recess (124b) is formed and a connecting part between the first recess forming part (122a) and the second recess forming part (122b). It may include a connecting part (122c).

[0046] And, the sleeve fixing portion (122, 124) may be formed so that the front end surface (F122) of the post (122) supports the sleeve periphery of the second surface (214) of the substrate. That is, the internal cover (120) further includes a cover bolt assembly (126) through which a cover bolt passes and a heat-fusion fixing part (128) that is heat-fused to the substrate (210), and the cover bolt assembly (126) and the heat-fusion fixing part (128) are each formed to support the outer periphery of the second surface (214) of the substrate, and when the cover bolt assembly (126) and the heat-fusion fixing part (128) support the outer periphery of the second surface (214) of the substrate, the post (122) may be formed such that the front end surface (F122) of the post (122) supports the sleeve periphery of the second surface (214) of the substrate, and the front end surface (F126) of the cover bolt assembly (126) and the front end surface (F128) of the heat-fusion fixing part (128) may be arranged on the same plane.

[0047] And, the sleeve fixing portion (122, 124) further includes an inner rib (123) protruding from the inner surface of the recess (124), and the inner rib (123) is formed in a plurality, and the plurality of inner ribs (123) can be formed spaced apart from each other along the circumferential direction of the recess (124).

[0048] And, at least one of the plurality of inner ribs (123) may be formed such that the distance to the center axis of the recess (124) decreases as it moves away from the leading edge (F122) of the post (122) along the axial direction of the recess (124).

[0049] And, each of the plurality of inner ribs (123) includes a gripping point (A123) that is spaced apart from the front end surface (F122) of the post (122) along the axial direction of the recess (124) by a value equal to the distance between the front end surface (F224) of the cover side protrusion (224) and the second surface (214) of the substrate, and the diameter of a virtual circle perpendicular to the central axis of the recess (124) and touching the gripping points (A123) of the plurality of inner ribs (123) can be formed to be smaller than or equal to the outer diameter of the front end surface (F224) of the cover side protrusion (224).

[0050] Additionally, each of the plurality of inner ribs (123) further includes a guide portion (B123) located between the gripping point (A123) and the front end surface (F122) of the post (122) in the axial direction of the recess (124), and the diameter of the smallest circle among the virtual circles perpendicular to the central axis of the recess (124) and in contact with the guide portion (B123) of the plurality of inner ribs (123) can be formed to be larger than the outer diameter of the front end surface (F224) of the cover side protrusion (224).

[0051] And, the sleeve fixing portion (122, 124) further includes an outer rib (125) protruding from the outer surface of the post (122), and the outer rib (125) is formed in a plurality, and the plurality of outer ribs (125) can be formed spaced apart from each other along the circumferential direction of the post (122).

[0052] Additionally, any of the plurality of outer ribs (125) may be formed to overlap with one of the plurality of inner ribs (123) in the radial direction of the recess (124).

[0053] Additionally, each of the plurality of outer ribs (125) may be formed such that the distance protruding from the outer surface of the post (122) increases as it moves away from the front end surface (F122) of the post (122) along the axial direction of the post (122).

[0054] The effects of the electric compressor according to the present embodiment will be explained below.

[0055] That is, the electric compressor according to the present embodiment includes an outer cover (110) to which the cover (100) is exposed to the outside and an inner cover (120) facing the inverter receiving space, wherein the outer cover (110) may be formed of a metal material and the inner cover (120) may be formed of a resin material. Accordingly, the rigidity of the cover (100) is secured by the outer cover (110), and insulation can be secured by the inner cover (120).

[0056] Here, as the inner cover (120) made of resin material includes the sleeve fixing part (122, 124) that fixes the first sleeve (220a) and the second sleeve (220b), not only is a short circuit between the first sleeve (220a) and the second sleeve (220b) through the cover (100) suppressed, but vibration, sagging, and bending of the substrate (210) can also be suppressed.

[0057] In addition, as the sleeve fixing part (122, 124) is formed to support the substrate (210), that is, as the front end surface (F122) of the post (122) is formed to support the second surface (214) of the substrate, vibration, sagging, and bending of the substrate (210) can be further suppressed.

[0058] And, as the sleeve fixing part (122, 124) includes the plurality of inner ribs (123), when the cover side protrusion (224) is inserted into the recess (124), the air inside the recess (124) can be discharged through the spaces between the plurality of inner ribs (123), so that the cover side protrusion (224) can be smoothly inserted into the recess (124).

[0059] And, as each of the plurality of inner ribs (123) is formed such that the distance to the center axis of the recess (124) decreases as it moves away from the front end surface (F122) of the post (122) along the axial direction of the recess (124), the cover side protrusion (224) can be guided to the center of the recess (124) when inserted into the recess (124).

[0060] And, as the diameter of a virtual circle perpendicular to the central axis of the recess (124) and in contact with the gripping points (A123) of the plurality of inner ribs (123) is formed to be smaller than or equal to the outer diameter of the front end surface (F224) of the cover-side protrusion (224), and the diameter of the smallest circle among the virtual circles perpendicular to the central axis of the recess (124) and in contact with the guide portion (B123) of the plurality of inner ribs (123) is formed to be larger than the outer diameter of the front end surface (F224) of the cover-side protrusion (224), the cover-side protrusion (224) is not subjected to force by the plurality of inner ribs (123) until the second surface (214) of the substrate is seated on the front end surface (F122) of the post (122), and can be easily inserted into the recess (124), and the second surface (214) of the substrate Only when the cover-side protrusion (224) is seated on the front surface (F122) of the post (122) can it be stably fixed by receiving force from the plurality of inner ribs (123).

[0061] And, as the sleeve fixing part (122, 124) includes the plurality of outer ribs (125), when the cover side protrusion (224) is fixed by the plurality of inner ribs (123), the post (122) may be prevented from spreading outward in the radial direction of the recess (124) by the reaction force that the cover (100) protrusion applies to the plurality of inner ribs (123).

[0062] And, as any one of the plurality of outer ribs (125) is formed to overlap with one of the plurality of inner ribs (123) in the radial direction of the recess (124), deformation of the post (122) can be effectively suppressed.

[0063] Here, in the present embodiment, the outer ribs (125) are formed in multiple numbers and are spaced apart from each other along the circumferential direction of the post (122), but are not limited thereto. That is, unlike the present embodiment, the outer ribs (125) may be formed in an annular shape extending along the circumferential direction of the post (122). However, in this case, the deformation suppression effect of the post (122), material, weight, and cost may increase significantly more than necessary. Therefore, it may be preferable for the outer ribs (125) to be formed as in the present embodiment.

[0064] In addition, considering the shape characteristics of the plurality of inner ribs (123) that receive greater force as they approach the cover (100), each of the plurality of outer ribs (125) is formed such that the distance protruding from the outer surface of the post (122) increases as it moves away from the front end surface (F122) of the post (122) along the axial direction of the post (122), thereby minimizing the increase in material, weight, and cost caused by the outer ribs (125) and more effectively suppressing the deformation of the post (122).

[0065] And, the sleeve fixing part (122, 124) includes the connecting part (122c), and since the connecting part (122c) is also formed to overlap with some of the plurality of inner ribs (123) in the radial direction of the recess (124), the deformation of the post (122) can be further suppressed.

[0066] Meanwhile, to facilitate assembly between the sleeve (220) and the substrate (210), the base (B224) of the cover-side protrusion (224) may be formed to have an outer diameter larger than the inner diameter of the substrate hole (216) so as not to pass through the substrate hole (216). The recess (124) may be formed such that when the cover-side protrusion (224) is inserted into the recess (124), the base (B224) of the cover-side protrusion (224) protrudes outside the recess (124), and the substrate (210) does not lift or bend.

[0067] Specifically, as illustrated in FIGS. 7 to 10, the recess (124) may include an outer portion (O124) that is formed in a recessed manner on the front end surface (F122) of the post (122) and accommodates the base portion (B224) of the cover side protrusion (224), and an inner portion (I124) that is formed in a recessed manner on the outer portion (O124) and accommodates the front end portion (A224) of the cover side protrusion (224).

[0068] And, the outer part (O124) of the recess (124) may be formed such that the inner diameter of the outer part (O124) is greater than or equal to the outer diameter of the base part (B224) and the depth of the outer part (O124) is greater than or equal to the height of the base part (B224), so that the base part (B224) of the cover-side protrusion (224) is fully accommodated in the outer part (O124) of the recess (124), that is, so that a part of the base part (B224) of the cover-side protrusion (224) does not protrude outside the outer part (O124) of the recess (124).

[0069] Here, the base portion (B224) of the cover-side protrusion (224) is soldered to the substrate (210) so that the sleeve (220) does not detach from the substrate (210). In order for the solder to be fully accommodated in the outer portion (O124) of the recess (124), that is, so that a part of the solder does not protrude outside the outer portion (O124) of the recess (124), it may be preferable for the inner diameter of the outer portion (O124) to be formed larger than the outer diameter of the base portion (B224) and the depth of the outer portion (O124) to be formed larger than the height of the base portion (B224).

[0070] For reference, in the embodiment illustrated in FIGS. 7 to 10, the sleeve (220) is inserted into the substrate hole (216) on the side of the second surface (214) of the substrate, so the base (B224) of the cover side protrusion (224) is formed to have an outer diameter larger than the inner diameter of the substrate hole (216), and the recess (124) includes the outer part (O124) which is larger than the inner part (I124) to accommodate the base (B224) of the cover side protrusion (224), but is not limited thereto. That is, the sleeve (220) may be inserted into the substrate hole (216) on the side of the first surface (212) of the substrate, in which case the base of the connector side protrusion (222) is formed to have an outer diameter larger than the inner diameter of the substrate hole (216), and at this time, the recess (124) may not be formed such that the outer part (O124) is larger than the inner part (I124).

Claims

1. A motor that generates power; A compression mechanism that receives power from the above motor and compresses the refrigerant; An inverter that controls the above motor; and It includes a cover that covers an inverter receiving space in which the above-mentioned inverter is accommodated; and The above inverter includes a substrate, a sleeve mounted on the substrate, and a connector inserted into the sleeve and connected to an external device. The above cover includes an outer cover exposed to the outside and an inner cover facing the inverter receiving space, and The above internal cover is an electric compressor comprising a sleeve fixing part that fixes the sleeve.

2. In Paragraph 1, An electric compressor in which the outer cover is formed of a metal material, the inner cover is formed of a resin material, and the outer cover and the inner cover are formed by double injection molding.

3. In Paragraph 2, The above internal cover further includes a heat-fusion fixing part that is heat-fused to the substrate.

4. In Paragraph 1, The sleeve fixing portion includes a post protruding toward the substrate and a recess formed in a recess on the leading edge of the post. The above sleeve is an electric compressor comprising a protrusion that penetrates the substrate and is inserted into the recess.

5. In Paragraph 4, The front end surface of the above post is formed to support the substrate, an electric compressor.

6. In Paragraph 4, The above-described sleeve fixing portion further includes an inner rib protruding from the inner circumferential surface of the recess in an electric compressor.

7. In Paragraph 6, An electric compressor in which the inner ribs are formed in plurality, and the plurality of inner ribs are formed spaced apart from each other along the circumferential direction of the recess.

8. In Paragraph 7, An electric compressor in which at least one of the plurality of inner ribs is formed such that the distance to the center axis of the recess decreases as it moves away from the leading edge of the post along the axial direction of the recess.

9. In Paragraph 8, Each of the plurality of inner ribs includes a gripping point along the axial direction of the recess, which is a point spaced apart from the leading surface of the post by a value equal to the distance between the leading surface of the protrusion and the substrate. An electric compressor in which the diameter of a virtual circle perpendicular to the central axis of the recess and tangential to the gripping points of the plurality of inner ribs is formed to be smaller than or equal to the outer diameter of the leading edge of the protrusion.

10. In Paragraph 9, Each of the plurality of inner ribs further includes a guide portion located between the gripping point and the front end surface of the post in the axial direction of the recess, and An electric compressor in which the diameter of the smallest circle among the virtual circles perpendicular to the central axis of the recess and in contact with the guide portions of the plurality of inner ribs is formed to be larger than the outer diameter of the front end surface of the protrusion.

11. In Paragraph 4, The above-mentioned sleeve fixing portion further includes an outer rib protruding from the outer surface of the post, in an electric compressor.

12. In Paragraph 11, An electric compressor in which the above-mentioned outer rib is formed such that the distance protruding from the outer surface of the post increases as it moves away from the leading surface of the post along the axial direction of the post.

13. In Paragraph 11, An electric compressor in which the above-mentioned outer ribs are formed in plurality, and the plurality of outer ribs are formed spaced apart from each other along the circumferential direction of the post.

14. In Paragraph 13, The sleeve fixing portion further includes an inner rib protruding from the inner circumferential surface of the recess, and The above inner ribs are formed in multiple numbers, and A plurality of inner ribs are formed spaced apart from each other along the circumferential direction of the recess, and An electric compressor in which any of the plurality of outer ribs is formed to overlap with one of the plurality of inner ribs in the radial direction of the recess.

15. In Paragraph 4, The sleeve and the recess are each formed in multiple numbers, and The above post is an electric compressor comprising a plurality of recess forming parts in which a plurality of recesses are formed.

16. In Paragraph 15, The above post is an electric compressor comprising a connecting part that connects the plurality of recess forming parts.

17. In Paragraph 16, An electric compressor in which the front end surface of the above-mentioned connecting part is formed on the same plane as the front end surface of the above-mentioned multiple recess forming parts.

18. In Paragraph 17, The above sleeve is formed of two parts, and The above recess includes a first recess into which a protrusion of one of the two sleeves is inserted, and a second recess into which a protrusion of the other of the two sleeves is inserted. The above post is an electric compressor comprising a first recess forming part in which the first recess is formed, a second recess forming part in which the second recess is formed, and a connecting part connecting the first recess forming part and the second recess forming part.

19. In Paragraph 4, The above substrate includes a substrate hole into which the sleeve is inserted, and The base of the above-mentioned protrusion is formed to have an outer diameter larger than the inner diameter of the substrate hole, and An electric compressor comprising an outer portion that is formed in a recess in a recess on the leading edge of the post and accommodates the base of the protrusion, and an inner portion that is formed in a recess in the outer portion and accommodates the leading edge of the protrusion.

20. In Paragraph 19, An electric compressor in which the inner diameter of the outer portion is formed larger than the outer diameter of the base portion and the depth of the outer portion is formed larger than the height of the base portion.

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