JP7501413B2 - Electric Compressor - Google Patents

Description

The present invention relates to an electric compressor.

The electric compressor includes a compression section that compresses the fluid, an electric motor that drives the compression section, and an inverter that drives the electric motor. The housing of the electric compressor accommodates the compression section and the electric motor. The electric compressor also includes an inverter cover that, together with the housing, defines an inverter chamber that accommodates the inverter. An annular seal member is interposed between the housing and the inverter cover.

Incidentally, a sealing member may be used that is formed by integrating an annular packing portion that seals between the housing and the inverter cover with a grommet portion that has an insertion hole through which the wiring that is electrically connected to the inverter is inserted. An example of such a sealing member is disclosed in Patent Document 1.

JP 2000-244142 A

When using such a sealing member, it is desirable to improve the sealing performance between the housing and the inverter cover. Furthermore, the shorter the axial seal length of the insertion hole in the grommet, the more difficult it is to maintain a tight seal between the grommet portion and the wiring, which may result in a deterioration in the sealing performance between the wiring and the insertion hole. However, if the overall size of the sealing member is increased in order to increase the axial seal length of the insertion hole, the electric compressor will become larger. Therefore, it is desirable to improve the sealing performance of the sealing member while preventing the electric compressor from becoming larger.

The electric compressor that solves the above problem includes a compression section that compresses a fluid, an electric motor that drives the compression section, an inverter that drives the electric motor, a housing that houses the compression section and the electric motor, an inverter cover that defines an inverter chamber that houses the inverter together with the housing, and an annular seal member that is interposed between the housing and the inverter cover, the seal member being an electric compressor that is formed by integrating a packing section that seals between the housing and the inverter cover, and a grommet section that seals between the housing and the inverter cover together with the packing section and has an insertion hole through which wiring electrically connected to the inverter is inserted, the grommet section being located in a direction parallel to the axis of the insertion hole, and being spaced apart from the packing section in the direction parallel to the axis of the insertion hole. The seal member has an extension that extends from the packing portion and the grommet portion and forms a part of the insertion hole, and the seal member has a first annular seal protrusion that is formed to extend continuously in an annular manner around the packing portion and the grommet portion and that serves as a crushing allowance when the packing portion and the grommet portion are in close contact with the housing, a first extended seal protrusion that is formed on the extended portion so as to extend along the first annular seal protrusion and that serves as a crushing allowance when the extended portion is in close contact with the housing, a second annular seal protrusion that is formed to extend continuously in an annular manner around the packing portion and the grommet portion and that serves as a crushing allowance when the packing portion and the grommet portion are in close contact with the inverter cover, and a second extended seal protrusion that is formed on the extended portion so as to extend along the second annular seal protrusion and that serves as a crushing allowance when the extended portion is in close contact with the inverter cover.

As a result, the crushing allowance when the packing portion and the grommet portion are in close contact with the housing is easily ensured by the first annular seal protrusion, and even if the grommet portion has an extension portion, the crushing allowance when the extension portion is in close contact with the housing is easily ensured by the first extended seal protrusion. Also, the crushing allowance when the packing portion and the grommet portion are in close contact with the inverter cover is easily ensured by the second annular seal protrusion, and even if the grommet portion has an extension portion, the crushing allowance when the extension portion is in close contact with the inverter cover is easily ensured by the second extended seal protrusion. Therefore, the sealing performance between the housing and the inverter cover in the seal member is improved.

Furthermore, compared to a configuration in which the grommet portion does not have an extension portion, the seal length in the axial direction of the insertion hole in the grommet portion is longer. In addition, in the grommet portion, the first annular seal protrusion, the second annular seal protrusion, the first extended seal protrusion, and the second extended seal protrusion are each crushed and the restoring force that attempts to return them to their original shapes makes it easier for the entire insertion hole to adhere to the wiring. Therefore, the surface pressure of the insertion hole against the wiring is easily ensured, and the sealability between the wiring and the insertion hole can be improved. Here, in order to increase the seal length in the axial direction of the insertion hole, only the grommet portion has an extension portion in the seal member, so the entire seal member is prevented from becoming larger. Therefore, the sealability of the seal member can be improved while preventing the electric compressor from becoming larger.

In the above electric compressor, the sealing member is integrally formed with a core material having higher rigidity than the sealing member, and the core material extends along the packing portion, except for at least the periphery of the insertion hole in the grommet portion.

According to this, the seal member is integrally provided with a core material having a higher rigidity than the seal member, and the core material extends along the packing portion, so that the shape of the packing portion in the seal member is easily determined by the core material. Therefore, the sealing property of the packing portion can be further improved. And, since the core material extends along the packing portion, except for at least the periphery of the insertion hole in the grommet portion, the seal member around the insertion hole in the grommet portion is more easily crushed than when the core material is arranged around the insertion hole in the grommet portion. Therefore, in the grommet portion, the first annular seal protrusion, the second annular seal protrusion, the first extended seal protrusion, and the second extended seal protrusion are each crushed and the restoring force that tries to return them to their original shape makes it easier for the entire insertion hole to adhere to the wiring. Therefore, the surface pressure of the insertion hole against the wiring is easily secured, and the sealing property between the wiring and the insertion hole can be further improved.

In the above electric compressor, the inner peripheral surface of the insertion hole before the wiring is inserted into the insertion hole is an arcuate surface that is uneven in an arc shape in the axial direction of the insertion hole, the first annular seal protrusion before it is in close contact with the housing is a square prism shape, the first extended seal protrusion before it is in close contact with the housing is a square prism shape extending along the first annular seal protrusion, the second annular seal protrusion before it is in close contact with the inverter cover is a square prism shape, and the second extended seal protrusion before it is in close contact with the inverter cover is a square prism shape extending along the second annular seal protrusion.

A configuration in which the inner peripheral surface of the insertion hole is an arcuate surface that is uneven in an arc shape in the axial direction of the insertion hole is suitable for improving the seal between the wiring and the insertion hole, and is also suitable for forming a grommet portion having an insertion hole. In addition, a configuration in which the first annular seal protrusion, the second annular seal protrusion, the first extended seal protrusion, and the second extended seal protrusion are each in the shape of a rectangular prism is suitable for improving the seal between the housing and the inverter cover in the seal member.

In the above electric compressor, the thickness of the grommet portion is thicker than the thickness of the packing portion, the outer surface of the first annular seal projection has a first packing seal surface located in the packing portion and a first grommet seal surface located in the grommet portion, the first grommet seal surface has a first flat surface and a first connecting surface that connects the first flat surface and the first packing seal surface and extends in an arc such that the thickness of the grommet portion gradually decreases from the first flat surface toward the first packing seal surface, and the outer surface of the first extended seal projection has a first extended flat surface that extends along the first flat surface and a first connecting surface that connects the first flat surface and the first packing seal surface. The outer surface of the second annular seal projection has a second packing seal surface located at the packing portion and a second grommet seal surface located at the grommet portion, the second grommet seal surface has a second flat surface and a second connecting surface that connects the second flat surface and the second packing seal surface and extends in an arc so that the thickness of the grommet portion gradually decreases from the second flat surface toward the second packing seal surface, and the outer surface of the second extended seal projection has a second extended flat surface that extends along the second flat surface and a second extended surface that extends along the second connecting surface.

As a result, for example, compared to a case in which the first connection surface, the first extension surface, the second connection surface, and the second extension surface each extend in the thickness direction of the grommet portion, the first connection surface and the first extension surface each easily adhere to the housing, and the second connection surface and the second extension surface each easily adhere to the inverter cover. Therefore, the sealing performance between the housing and the inverter cover in the seal member can be further improved.

This invention makes it possible to improve the sealing performance of the sealing member while preventing the electric compressor from becoming too large.

1 is a cross-sectional view showing an electric compressor according to an embodiment. FIG. 4 is a partially cutaway plan view of the motor housing as viewed from above. FIG. 4 is a partially cutaway plan view of the inverter cover; 5A and 5B are enlarged perspective views showing the periphery of a grommet portion. FIG. FIG. FIG. 4 is an enlarged front view of the sealing member showing the periphery of the grommet portion.

An embodiment of an electric compressor will now be described with reference to Figures 1 to 7. The electric compressor of the present embodiment is used, for example, in a vehicle air conditioner.
(Overall configuration of electric compressor 10)
As shown in Fig. 1, the electric compressor 10 includes a compression unit 11, an electric motor 12, an inverter 13, a housing 14, and an inverter cover 15. The compression unit 11 compresses a refrigerant as a fluid. The compression unit 11 is, for example, of a scroll type. The electric motor 12 drives the compression unit 11. The inverter 13 drives the electric motor 12. The housing 14 accommodates the compression unit 11 and the electric motor 12. The inverter cover 15 is connected to the housing 14.

(Configuration of the housing 14)
The housing 14 has a motor housing 16 and a discharge housing 17. The motor housing 16 and the discharge housing 17 are made of metal, for example, aluminum. Therefore, the housing 14 is made of metal, for example, aluminum.

The motor housing 16 is in the shape of a rectangular block. The motor housing 16 has a circular hole-shaped first chamber forming recess 16a. The first chamber forming recess 16a extends from a first end face 16b located on one side of the longitudinal direction of the motor housing 16 to a second end face 16c located on the other side of the longitudinal direction. The first chamber forming recess 16a opens to the first end face 16b. The first end face 16b is in the shape of a flat surface. The discharge housing 17 is in the shape of a rectangular block. The discharge housing 17 has a circular hole-shaped first chamber forming recess 17a. The first chamber forming recess 17a opens to a first end face 17b of the discharge housing 17. The first end face 17b is in the shape of a flat surface.

The motor housing 16 and the discharge housing 17 are connected to each other with the first end surface 16b of the motor housing 16 facing the first end surface 17b of the discharge housing 17. The inside of the first chamber forming recess 16a of the motor housing 16 and the inside of the first chamber forming recess 17a of the discharge housing 17 are connected to each other. The first chamber forming recess 16a of the motor housing 16 and the first chamber forming recess 17a of the discharge housing 17 define a first chamber 18. A gasket 19 is interposed between the first end surface 16b of the motor housing 16 and the first end surface 17b of the discharge housing 17. The gasket 19 seals between the first end surface 16b of the motor housing 16 and the first end surface 17b of the discharge housing 17. The electric motor 12 is accommodated inside the first chamber forming recess 16a of the motor housing 16 in the first chamber 18. The compression section 11 is housed in the first chamber 18, closer to the discharge housing 17 than the electric motor 12.

The motor housing 16 has a second chamber forming recess 20. The second chamber forming recess 20 is formed in the first outer surface 16d, which is the outer surface extending in the longitudinal direction of the motor housing 16. The second chamber forming recess 20 is a square hole in plan view. Therefore, the first outer surface 16d is a square ring in plan view. The first outer surface 16d is a flat surface. The first outer surface 16d of the motor housing 16 has a hole forming recess 21.

(Configuration of inverter cover 15)
The inverter cover 15 has a plate-shaped end wall 22 and a peripheral wall 23 that protrudes cylindrically from the outer periphery of the end wall 22. The peripheral wall 23 is rectangular cylindrical. An end face 23a of the peripheral wall 23 extends along the first outer surface 16d of the motor housing 16. The end face 23a of the peripheral wall 23 is flat. The end face 23a of the peripheral wall 23 has a hole-forming recess 24. The inverter cover 15 is connected to the first outer surface 16d of the motor housing 16 with the end face 23a of the peripheral wall 23 facing the first outer surface 16d of the motor housing 16. The hole-forming recess 21 of the motor housing 16 and the hole-forming recess 24 of the inverter cover 15 face each other. The inverter cover 15 closes the opening of the second chamber-forming recess 20. The second chamber-forming recess 20 and the inverter cover 15 define an inverter chamber 25. Therefore, the inverter cover 15 defines an inverter chamber 25 together with the motor housing 16. The inverter chamber 25 accommodates the inverter 13 therein.

(Configuration of Seal Member 30)
The electric compressor 10 includes an annular seal member 30. The seal member 30 is made of rubber. The seal member 30 is an elastic material. The seal member 30 is interposed between the first outer surface 16d of the motor housing 16 and the end surface 23a of the peripheral wall 23 of the inverter cover 15. The seal member 30 provides a seal between the first outer surface 16d of the motor housing 16 and the end surface 23a of the peripheral wall 23 of the inverter cover 15.

As shown in Figures 2 and 3, the seal member 30 is formed by integrating a packing portion 31 and a grommet portion 32. The packing portion 31 seals between the portion of the first outer surface 16d of the motor housing 16 excluding the hole-forming recess 21 and the portion of the end surface 23a of the peripheral wall 23 of the inverter cover 15 excluding the hole-forming recess 24. The grommet portion 32 seals between the hole-forming recess 21 of the motor housing 16 and the hole-forming recess 24 of the inverter cover 15. Therefore, the grommet portion 32, together with the packing portion 31, seals between the motor housing 16 and the inverter cover 15.

Here, the direction in which the line segment connecting the inner peripheral surface and the outer peripheral surface of the seal member 30 at the shortest distance extends when the seal member 30 is viewed from the axial direction of the seal member 30 is defined as the "width direction of the seal member 30." The thickness direction of the seal member 30 is the axial direction of the seal member 30. The length of the seal member 30 in the width direction at the packing portion 31 is constant.

As shown in Figures 4(a) and 4(b), the thickness of the grommet portion 32 is thicker than the thickness of the packing portion 31. The grommet portion 32 has an extension portion 33. The extension portion 33 extends further in the width direction of the seal member 30 than the packing portion 31. Therefore, the width direction length of the seal member 30 at the grommet portion 32 is longer than the width direction length of the seal member 30 at the packing portion 31.

(Configuration of the first annular seal projection 41 and the first extended seal projection 42)
As shown in Figures 3, 4(b) and 5, the seal member 30 has three first annular seal projections 41. Each first annular seal projection 41 protrudes from a first seal outer surface 30a located on one side in the thickness direction of the seal member 30. In Figure 3, the first seal outer surface 30a is indicated by dot hatching. The amount of protrusion of each first annular seal projection 41 from the first seal outer surface 30a is constant in the circumferential direction of the seal member 30. The outer surface of each first annular seal projection 41 extends along the first seal outer surface 30a.

Each first annular seal protrusion 41 is formed to extend annularly in continuation with the packing portion 31 and the grommet portion 32. The three first annular seal protrusions 41 extend annularly in a line in the width direction of the seal member 30. The distance between adjacent first annular seal protrusions 41 in the width direction of the seal member 30 is constant. Each first annular seal protrusion 41 becomes a crushing margin when the packing portion 31 and the grommet portion 32 are in close contact with the first end face 16b of the motor housing 16. Each first annular seal protrusion 41 before being in close contact with the first end face 16b of the motor housing 16 is in the shape of a square pillar.

The seal member 30 has four first extended seal protrusions 42. Each first extended seal protrusion 42 protrudes from the first seal outer surface 30a of the seal member 30. Each first extended seal protrusion 42 is formed in the extension portion 33 so as to extend along the first annular seal protrusion 41. The amount of protrusion of each first extended seal protrusion 42 from the first seal outer surface 30a is the same as the amount of protrusion of the first annular seal protrusion 41 from the first seal outer surface 30a. The outer surface of each first extended seal protrusion 42 extends along the first seal outer surface 30a. The four first extended seal protrusions 42 extend along the first annular seal protrusion 41 while being aligned in the width direction of the seal member 30. The interval between adjacent first extended seal protrusions 42 in the width direction of the seal member 30 is constant. Each first extended seal protrusion 42 becomes a crushing margin when the extension portion 33 is in close contact with the first end surface 16b of the motor housing 16. Before being in contact with the first end face 16b of the motor housing 16, each first extended seal projection 42 has a square column shape that extends along the first annular seal projection 41.

As shown in FIG. 4B, the outer surface of each first annular seal projection 41 has a first packing seal surface 43 located in the packing portion 31 and a first grommet seal surface 44 located in the grommet portion 32. Each first grommet seal surface 44 has a first flat surface 45 and a pair of first connection surfaces 46. Each first flat surface 45 extends in a direction perpendicular to the thickness direction of the seal member 30. Each first connection surface 46 connects the first flat surface 45 and the first packing seal surface 43. Specifically, one of the pair of first connection surfaces 46 connects a first edge 451 located on one side of the circumferential direction of the seal member 30 at the first flat surface 45 and a first edge 431 located on one side of the circumferential direction of the seal member 30 at the first packing seal surface 43. The other of the pair of first connection surfaces 46 connects a second edge 452 located on the other side of the circumferential direction of the seal member 30 at the first flat surface 45 to a second edge 432 located on the other side of the circumferential direction of the seal member 30 at the first packing seal surface 43. Each first connection surface 46 extends in an arc so that the thickness of the grommet portion 32 gradually decreases from the first flat surface 45 toward the first packing seal surface 43.

The outer surface of each first extended seal projection 42 has a first extended flat surface 47 and a pair of first extending surfaces 48. Each first extended flat surface 47 extends along each first flat surface 45. Each first extended flat surface 47 is located on the same plane as each first flat surface 45. Each first extending surface 48 extends along each first connecting surface 46. Specifically, one of the pair of first extending surfaces 48 extends along one of the pair of first connecting surfaces 46. The other of the pair of first extending surfaces 48 extends along the other of the pair of first connecting surfaces 46.

(Configuration of the second annular seal projection 51 and the second extended seal projection 52)
As shown in Figures 2, 4(a) and 5, the seal member 30 has three second annular seal projections 51. Each second annular seal projection 51 protrudes from the second seal outer surface 30b located on the other side in the thickness direction of the seal member 30. In Figure 2, the second seal outer surface 30b is indicated by dot hatching. The amount of protrusion of each second annular seal projection 51 from the second seal outer surface 30b is constant in the circumferential direction of the seal member 30. The outer surface of each second annular seal projection 51 extends along the second seal outer surface 30b.

Each second annular seal protrusion 51 is formed to extend annularly in continuation with the packing portion 31 and the grommet portion 32. The three second annular seal protrusions 51 extend annularly in a line in the width direction of the seal member 30. The distance between adjacent second annular seal protrusions 51 in the width direction of the seal member 30 is constant. Each second annular seal protrusion 51 becomes a crushing margin when the packing portion 31 and the grommet portion 32 are in close contact with the end face 23a of the peripheral wall 23 of the inverter cover 15. Each second annular seal protrusion 51 is in the shape of a square pillar before being in close contact with the end face 23a of the peripheral wall 23 of the inverter cover 15.

The seal member 30 has four second extended seal protrusions 52. Each second extended seal protrusion 52 protrudes from the second seal outer surface 30b of the seal member 30. Each second extended seal protrusion 52 is formed in the extension portion 33 so as to extend along the second annular seal protrusion 51. The amount of protrusion of each second extended seal protrusion 52 from the second seal outer surface 30b is the same as the amount of protrusion of the second annular seal protrusion 51 from the second seal outer surface 30b. The outer surface of each second extended seal protrusion 52 extends along the second seal outer surface 30b. The four second extended seal protrusions 52 extend along the second annular seal protrusion 51 while being aligned in the width direction of the seal member 30. The interval between adjacent second extended seal protrusions 52 in the width direction of the seal member 30 is constant. Each second extended seal protrusion 52 becomes a crushing margin when the extension portion 33 is in close contact with the end surface 23a of the peripheral wall 23 of the inverter cover 15. Before being in close contact with the end surface 23a of the peripheral wall 23 of the inverter cover 15, each second extended seal protrusion 52 has a square column shape that extends along the second annular seal protrusion 51.

As shown in FIG. 4(a), the outer surface of each second annular seal projection 51 has a second packing seal surface 53 located in the packing portion 31 and a second grommet seal surface 54 located in the grommet portion 32. Each second grommet seal surface 54 has a second flat surface 55 and a pair of second connection surfaces 56. Each second flat surface 55 extends in a direction perpendicular to the thickness direction of the seal member 30. Each second connection surface 56 connects the second flat surface 55 and the second packing seal surface 53. Specifically, one of the pair of second connection surfaces 56 connects a first edge 551 located on one side of the circumferential direction of the seal member 30 at the second flat surface 55 to a first edge 531 located on one side of the circumferential direction of the seal member 30 at the second packing seal surface 53. The other of the pair of second connection surfaces 56 connects a second edge 552 located on the other side of the circumference of the seal member 30 at the second flat surface 55 and a second edge 532 located on the other side of the circumference of the seal member 30 at the second packing seal surface 53. Each second connection surface 56 extends in an arc so that the thickness of the grommet portion 32 gradually decreases from the second flat surface 55 toward the second packing seal surface 53.

The outer surface of each second extended seal projection 52 has a second extended flat surface 57 and a pair of second extending surfaces 58. Each second extended flat surface 57 extends along each second flat surface 55. Each second extended flat surface 57 is located on the same plane as each second flat surface 55. Each second extending surface 58 extends along each second connecting surface 56. Specifically, one of the pair of second extending surfaces 58 extends along one of the pair of second connecting surfaces 56. The other of the pair of second extending surfaces 58 extends along the other of the pair of second connecting surfaces 56.

(Configuration of the insertion hole 60)
As shown in Figures 4(a) and 4(b), the grommet portion 32 has two insertion holes 60. The axial directions of the insertion holes 60 are aligned with each other. The axial direction of the insertion holes 60 is aligned with the width direction of the seal member 30. The extension portion 33 forms a part of each insertion hole 60. Thus, the extension portion 33 extends in the axial direction of each insertion hole 60 further than the packing portion 31. The seal length in the axial direction of each insertion hole 60 in the grommet portion 32 is longer than the length of the seal member 30 in the width direction of the packing portion 31. Wiring 70 electrically connected to the inverter 13 is inserted into each insertion hole 60.

The two insertion holes 60 are formed in the grommet portion 32 with the axes of the insertion holes 60 aligned in the circumferential direction of the seal member 30. One of the two insertion holes 60 is located in the grommet portion 32, closer to the first edge 431 of the first packing seal surface 43 and the first edge 531 of the second packing seal surface 53. The other of the two insertion holes 60 is located in the grommet portion 32, closer to the second edge 432 of the first packing seal surface 43 and the second edge 532 of the second packing seal surface 53.

As shown in FIG. 5, before the wiring 70 is inserted into the insertion hole 60, the inner peripheral surface of each insertion hole 60 is an arcuate surface that is uneven in an arc shape in the axial direction of each insertion hole 60. The inner peripheral surface of each insertion hole 60 is uneven such that there are three convex portions and two concave portions in the axial direction of each insertion hole 60. The inner peripheral surface of each insertion hole 60 is formed such that convex portions and concave portions in the axial direction of each insertion hole 60 are alternately and continuously formed.

(Configuration of the core material 65)
As shown in Fig. 6, the seal member 30 is integrally formed with a metal core material 65. The core material 65 is made of, for example, stainless steel. The core material 65 has a higher rigidity than the seal member 30. The core material 65 is in the form of a thin flat plate. The core material 65 is in the form of a non-annular strip. The seal member 30 and the core material 65 are integrally formed by, for example, insert molding. The core material 65 extends along the packing portion 31, except for at least the periphery of the insertion hole 60 in the grommet portion 32.

As shown in FIG. 7, the first end 651, which is one end of the core material 65 in the circumferential direction of the seal member 30, protrudes slightly toward the grommet portion 32 beyond the first edge 431 of the first packing seal surface 43 and the first edge 531 of the second packing seal surface 53, and is embedded inside the grommet portion 32. The first end 651 of the core material 65 is located inside an imaginary circle C1 that is centered on the axis of one of the two insertion holes 60 and passes through a portion of the first seal outer surface 30a that extends along one of the pair of first connection surfaces 46 and a portion of the first seal outer surface 30a that extends along one of the pair of second connection surfaces 56.

The second end 652, which is the other end of the core material 65 in the circumferential direction of the seal member 30, protrudes slightly toward the grommet portion 32 beyond the second edge 432 of the first packing seal surface 43 and the second edge 532 of the second packing seal surface 53, and is embedded inside the grommet portion 32. The second end 652 of the core material 65 is located inside an imaginary circle C2 that is centered on the other axis of the two insertion holes 60 and passes through the portion of the first seal outer surface 30a that extends along the other of the pair of first connection surfaces 46 and the portion that extends along the other of the pair of second connection surfaces 56.

(Action)
Next, the operation of this embodiment will be described.
The crushing allowance when the packing portion 31 and the grommet portion 32 are in close contact with the first end face 16b of the motor housing 16 is easily secured by the first annular seal protrusions 41, and furthermore, the crushing allowance when the extension portion 33 is in close contact with the first end face 16b of the motor housing 16 is easily secured by the first extended seal protrusions 42. In addition, the crushing allowance when the packing portion 31 and the grommet portion 32 are in close contact with the end face 23a of the peripheral wall 23 of the inverter cover 15 is easily secured by the second annular seal protrusions 51, and furthermore, the crushing allowance when the extension portion 33 is in close contact with the end face 23a of the peripheral wall 23 of the inverter cover 15 is easily secured by the second extended seal protrusions 52. Therefore, the sealing property between the motor housing 16 and the inverter cover 15 in the seal member 30 is improved.

Furthermore, compared to a configuration in which the grommet portion 32 does not have the extension portion 33, the axial seal length of each insertion hole 60 in the grommet portion 32 is longer. In the grommet portion 32, the first annular seal protrusion 41, the second annular seal protrusion 51, the first extended seal protrusion 42, and the second extended seal protrusion 52 are crushed and the restoring force that attempts to return them to their original shape makes it easier for the entire insertion hole 60 to adhere to each wiring 70. Therefore, the surface pressure of each insertion hole 60 against each wiring 70 is easily ensured, and the sealability between each wiring 70 and each insertion hole 60 is improved.

(effect)
The above embodiment can provide the following advantageous effects.
(1) The grommet portion 32 has an extension portion 33. The seal member 30 has a first annular seal projection 41, a first extended seal projection 42, a second annular seal projection 51, and a second extended seal projection 52. With this, the first annular seal projection 41 can easily ensure a crushing allowance when the packing portion 31 and the grommet portion 32 are in close contact with the motor housing 16, and even if the grommet portion 32 has the extended portion 33, the first extended seal projection 42 can easily ensure a crushing allowance when the extended portion 33 is in close contact with the motor housing 16. Also, the second annular seal projection 51 can easily ensure a crushing allowance when the packing portion 31 and the grommet portion 32 are in close contact with the inverter cover 15, and even if the grommet portion 32 has the extended portion 33, the second extended seal projection 52 can easily ensure a crushing allowance when the extended portion 33 is in close contact with the inverter cover 15. Therefore, the sealing performance between the motor housing 16 and the inverter cover 15 in the seal member 30 is improved.

Furthermore, the axial seal length of the insertion hole 60 in the grommet portion 32 is longer than when the grommet portion 32 does not have the extension portion 33. In the grommet portion 32, the first annular seal protrusion 41, the second annular seal protrusion 51, the first extension seal protrusion 42, and the second extension seal protrusion 52 are crushed and the restoring force of the first annular seal protrusion 41, the second annular seal protrusion 51, the first extension seal protrusion 42, and the second extension seal protrusion 52 are crushed and the restoring force of the second extension seal protrusion 52 is caused to return to the original shape, so that the entire insertion hole 60 is easily attached to the wiring 70. Therefore, the surface pressure of the insertion hole 60 against the wiring 70 is easily secured, so that the sealing property between the wiring 70 and the insertion hole 60 can be improved. Here, in order to increase the axial seal length of the insertion hole 60, only the grommet portion 32 has the extension portion 33 in the seal member 30, so that the entire seal member 30 is prevented from becoming large. Therefore, the sealing property of the seal member 30 can be improved while preventing the electric compressor 10 from becoming large.

(2) The seal member 30 is integrally provided with the core material 65, which has a higher rigidity than the seal member 30, and the core material 65 extends along the packing portion 31, so that the shape of the packing portion 31 in the seal member 30 is easily determined by the core material 65. Therefore, the sealing property of the packing portion 31 can be further improved. And, since the core material 65 extends along the packing portion 31, except for at least the periphery of the insertion hole 60 in the grommet portion 32, the seal member 30 around the insertion hole 60 in the grommet portion 32 is easily crushed compared to the case where the core material 65 is arranged around the insertion hole 60 in the grommet portion 32. Therefore, in the grommet portion 32, the first annular seal protrusion 41, the second annular seal protrusion 51, the first extended seal protrusion 42, and the second extended seal protrusion 52 are crushed and the entire insertion hole 60 is easily attached to the wiring 70 due to the restoring force that tries to return to the original shape. This makes it easier to ensure the surface pressure of the insertion hole 60 against the wiring 70, further improving the sealing between the wiring 70 and the insertion hole 60.

(3) The configuration in which the inner peripheral surface of the insertion hole 60 is an arcuate surface that is uneven in an arc shape in the axial direction of the insertion hole 60 is suitable for improving the sealing between the wiring 70 and the insertion hole 60, and is also suitable for forming the grommet portion 32 having the insertion hole 60. In addition, the configuration in which the first annular seal projection 41, the second annular seal projection 51, the first extended seal projection 42, and the second extended seal projection 52 are each a rectangular prism is suitable for improving the sealing between the motor housing 16 and the inverter cover 15 in the seal member 30.

(4) The first grommet seal surface 44 has a first connection surface 46 that extends in an arc such that the thickness of the grommet portion 32 gradually decreases from the first flat surface 45 toward the first packing seal surface 43. The outer surface of the first extended seal projection 42 has a first extension surface 48 that extends along the first connection surface 46. The second grommet seal surface 54 has a second connection surface 56 that extends in an arc such that the thickness of the grommet portion 32 gradually decreases from the second flat surface 55 toward the second packing seal surface 53. The outer surface of the second extended seal projection 52 has a second extension surface 58 that extends along the second connection surface 56. With this, for example, compared to when the first connection surface 46, the first extension surface 48, the second connection surface 56, and the second extension surface 58 each extend in the thickness direction of the grommet portion 32, the first connection surface 46 and the first extension surface 48 are more likely to adhere to the motor housing 16, and the second connection surface 56 and the second extension surface 58 are more likely to adhere to the inverter cover 15. Therefore, the sealing performance between the motor housing 16 and the inverter cover 15 in the seal member 30 can be further improved.

(5) The amount of protrusion of each first extended seal protrusion 42 from the first seal outer surface 30a is the same as the amount of protrusion of the first annular seal protrusion 41 from the first seal outer surface 30a. Also, the amount of protrusion of each second extended seal protrusion 52 from the second seal outer surface 30b is the same as the amount of protrusion of the second annular seal protrusion 51 from the second seal outer surface 30b. As a result, in the grommet portion 32, the first annular seal protrusion 41, the second annular seal protrusion 51, the first extended seal protrusion 42, and the second extended seal protrusion 52 are crushed and the restoring force that tries to return them to their original shapes makes it easier for the entire insertion hole 60 to be in close contact with the wiring 70 with uniform surface pressure. Therefore, the sealing property between the wiring 70 and the insertion hole 60 can be further improved.

(Example of change)
The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

In the above embodiment, the core material 65 may be provided integrally with the seal member 30 so as to extend around each insertion hole 60 in the grommet portion 32 .
In the above embodiment, the first end 651 of the core 65 may be located outside the imaginary circle C1.

In the embodiment, the second end 652 of the core 65 may be located outside the imaginary circle C2.
In the embodiment, the core material 65 does not have to be made of metal and may be made of, for example, resin. For example, if the core material 65 is made of resin, the core material 65 needs to be formed of a resin having higher rigidity than the seal member 30. In short, as long as the core material 65 has higher rigidity than the seal member 30, the material of the core material 65 is not particularly limited.

In the above-mentioned embodiment, the seal member 30 does not have to be provided integrally with the core material 65. In other words, the electric compressor 10 may have a configuration in which the core material 65 is omitted.
In the embodiment, the inner peripheral surface of the insertion hole 60 may be uneven such that there are two convex portions and one concave portion in the axial direction of each insertion hole 60. Even in this case, the inner peripheral surface of the insertion hole 60 is formed such that convex portions and concave portions are alternately continuous in the axial direction of each insertion hole 60. In short, the number of convex portions in the axial direction of each insertion hole 60 is not particularly limited.

In the above embodiment, the inner circumferential surface of the insertion hole 60 may be, for example, a surface that has projections and recesses in a labyrinth shape in the axial direction of the insertion hole 60 .
In the embodiment, the inner circumferential surface of the insertion hole 60 does not have to be an arcuate surface that is uneven in an arc shape in the axial direction of the insertion hole 60. For example, the inner circumferential surface of the insertion hole 60 may be a cylinder that extends straight around the axis of the insertion hole 60.

In the above-mentioned embodiment, the number of the first annular seal projections 41 is not particularly limited and may be, for example, two.
In the above-mentioned embodiment, the number of the second annular seal projections 51 is not particularly limited and may be, for example, two.

In the above-described embodiment, the number of the first extended seal projections 42 is not limited to a specific number. For example, the number may be two or three.
In the above-described embodiment, the number of the second extended seal projections 52 is not limited to a specific number. For example, the number may be two or three.

In the embodiment, the amount of protrusion of each first extended seal protrusion 42 from the first seal outer surface 30a may be different from the amount of protrusion of the first annular seal protrusion 41 from the first seal outer surface 30a.

In the embodiment, the amount of protrusion of each second extended seal protrusion 52 from the second seal outer surface 30b may be different from the amount of protrusion of the second annular seal protrusion 51 from the second seal outer surface 30b.

In the embodiment, the intervals between adjacent first annular seal projections 41 in the width direction of the seal member 30 do not need to be constant.
In the embodiment, the intervals between adjacent first extended seal projections 42 in the width direction of the seal member 30 do not need to be constant.

In the embodiment, the intervals between adjacent second annular seal projections 51 in the width direction of the seal member 30 do not need to be constant.
In the embodiment, the intervals between adjacent second extended seal projections 52 in the width direction of the seal member 30 do not need to be constant.

○ In the embodiment, each of the first annular seal protrusion 41, the second annular seal protrusion 51, the first extended seal protrusion 42, and the second extended seal protrusion 52 does not have to be rectangular prism-shaped. For example, each of the first annular seal protrusion 41, the second annular seal protrusion 51, the first extended seal protrusion 42, and the second extended seal protrusion 52 may be, for example, semi-cylindrical. In short, each of the shapes of the first annular seal protrusion 41, the second annular seal protrusion 51, the first extended seal protrusion 42, and the second extended seal protrusion 52 is not particularly limited.

In the embodiment, the number of insertion holes 60 formed in the grommet portion 32 is not limited to two and may be, for example, three. In short, the number of insertion holes 60 formed in the grommet portion 32 is not particularly limited.

In the embodiment, for example, the first connecting surface 46 , the first extending surface 48 , the second connecting surface 56 , and the second extending surface 58 may each extend in the thickness direction of the grommet portion 32 .
In the above-mentioned embodiment, the compression section 11 is not limited to a scroll type, and may be, for example, a piston type or a vane type.

In the embodiment, the electric compressor 10 is used in a vehicle air conditioning system, but the present invention is not limited to this. For example, the electric compressor 10 may be mounted on a fuel cell vehicle, and the compression unit 11 may compress air as a fluid to be supplied to the fuel cell.

10...electric compressor, 11...compression section, 12...electric motor, 13...inverter, 14...housing, 15...inverter cover, 25...inverter chamber, 30...sealing member, 31...packing section, 32...grommet section, 33...extension section, 41...first annular seal projection, 42...first extended seal projection, 43...first packing seal surface, 44...first grommet seal surface, 45...first flat surface, 46...first connection surface, 47...first extended flat surface, 48...first extension surface, 51...second annular seal projection, 52...second extended seal projection, 53...second packing seal surface, 54...second grommet seal surface, 55...second flat surface, 56...second connection surface, 57...second extended flat surface, 58...second extension surface, 60...through hole, 65...core material, 70...wiring.

Claims (5)

A compression section that compresses the fluid;
an electric motor that drives the compression unit;
an inverter that drives the electric motor;
a housing that accommodates the compression unit and the electric motor;
an inverter cover that defines, together with the housing, an inverter chamber that houses the inverter;
an annular seal member interposed between the housing and the inverter cover,
The sealing member is
a packing portion that seals between the housing and the inverter cover;
a grommet portion which seals between the housing and the inverter cover together with the packing portion and has an insertion hole through which a wiring electrically connected to the inverter is inserted,
the grommet portion has an extension portion that extends in an axial direction of the insertion hole further than the packing portion and forms a part of the insertion hole,
the seal member has a first seal outer surface located on one side in a thickness direction of the seal member and a second seal outer surface located on the other side in the thickness direction,
a first annular seal protrusion that protrudes from an outer surface of the first seal and is formed so as to extend annularly continuously to the packing portion and the grommet portion, and that serves as a crushing margin when the packing portion and the grommet portion are in close contact with the housing;
a first extended seal protrusion formed on the extension portion so as to protrude from the outer surface of the first seal and extend along the first annular seal protrusion, the first extended seal protrusion being a crushing margin when the extension portion is in close contact with the housing;
a second annular seal protrusion that protrudes from an outer surface of the second seal and is formed to extend annularly continuously to the packing portion and the grommet portion, and that serves as a crushing margin when the packing portion and the grommet portion are in close contact with the inverter cover;
a second extended seal protrusion formed on the extended portion so as to protrude from the second seal outer surface and extend along the second annular seal protrusion, the second extended seal protrusion being a crushing margin when the extended portion is in close contact with the inverter cover ,
a protruding amount of the first extended seal projection from the first seal outer surface is the same as a protruding amount of the first annular seal projection from the first seal outer surface,
2. The electric compressor according to claim 1, wherein a protruding amount of the second extended seal projection from the outer surface of the second seal is the same as a protruding amount of the second annular seal projection from the outer surface of the second seal . the sealing member is integrally provided with a core material having a higher rigidity than the sealing member,
The electric compressor according to claim 1, wherein the core member extends along the packing portion except for at least a portion of the grommet portion around the insertion hole. an inner circumferential surface of the insertion hole before the wiring is inserted into the insertion hole is an arcuate surface that is arcuately concave and convex in an axial direction of the insertion hole,
The first annular seal projection has a rectangular prism shape before being brought into close contact with the housing,
The first extended seal projection before being in close contact with the housing has a rectangular prism shape extending along the first annular seal projection,
The second annular seal projection has a rectangular prism shape before being in close contact with the inverter cover,
3. The electric compressor according to claim 1, wherein the second extended seal projection has a rectangular prism shape extending along the second annular seal projection before being brought into close contact with the inverter cover. The thickness of the grommet portion is greater than the thickness of the packing portion,
an outer surface of the first annular seal projection has a first packing seal surface located at the packing portion and a first grommet seal surface located at the grommet portion,
the first grommet seal surface has a first flat surface and a first connection surface that connects the first flat surface and the first packing seal surface and extends in an arc such that a thickness of the grommet portion gradually decreases from the first flat surface toward the first packing seal surface,
The first connection surfaces are provided as a pair with the first flat surface therebetween,
The outer surface of the first extended seal projection has a first extended flat surface extending along the first flat surface and a pair of first extending surfaces extending along the pair of first connecting surfaces,
an outer surface of the second annular seal projection has a second packing seal surface located at the packing portion and a second grommet seal surface located at the grommet portion,
the second grommet seal surface has a second flat surface and a second connection surface that connects the second flat surface and the second packing seal surface and extends in an arc such that a thickness of the grommet portion gradually decreases from the second flat surface toward the second packing seal surface,
The second connection surfaces are provided as a pair with the second flat surface therebetween,
The outer surface of the second extended seal projection has a second extended flat surface extending along the second flat surface and a pair of second extending surfaces extending along the pair of second connecting surfaces ,
The electric compressor according to any one of claims 1 to 3, characterized in that the first flat surface and the second flat surface are parallel to each other, and each of the first connection surfaces and each of the second connection surfaces arranged to sandwich the wiring therebetween have a shape that passes through a virtual circle centered on an axis of the insertion hole in the grommet portion . the sealing member is integrally provided with a core material having a higher rigidity than the sealing member,
The core member extends along the packing portion between the first extended seal projection and the second extended seal projection,
5. The electric compressor according to claim 4, wherein a circumferential end portion of the core member is disposed inside the imaginary circle.