Electric compressor and method for assembling electric compressor

Abstract

To inhibit increase of manufacturing costs even if an entire length of a stator is increased to improve the output of a motor.SOLUTION: A motor compressor 100 includes: a housing 10; an end housing 20 which seals an opening 11 of the housing 10; fastening bolts 21 which generate fastening force for locating the housing 10 and the end housing 20 close to each other; a compressor 30 disposed at the opening 11 side of the housing 10; a motor 40 disposed at the bottom part 12 side of the housing 10; and a holding part 80 disposed between the compressor 30 and the motor 40. The motor 40 includes a stator 41 and a rotor 42. The stator 41 is fixed to the housing 10 by the fastening force generated by the fastening bolts 21 in a state that a first end surface 41a at the bottom part 12 contacts with the housing 10 and a second end surface 41b at the opening 11 side contacts with the holding part 80.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an electric compressor and a method for assembling an electric compressor. [Background technology]

[0002] In an electric compressor, a motor for driving a compression mechanism is built into a housing having a sealed structure together with the compression mechanism (see, for example, Patent Document 1). Patent Document 1 discloses a structure in which an insertion hole for inserting a fastening bolt is formed in a stator, and the tip of the fastening bolt inserted into the insertion hole is fastened to a fastening hole formed in the housing to fix the stator to the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-92889 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the electric compressor disclosed in Patent Document 1, the length of the insertion hole formed in the stator to fix the stator to the housing is set to be the same as the overall length of the stator in the drive shaft direction of the motor (the motor stacking thickness). Therefore, if the overall length of the stator is increased to improve the output of the motor, the overall lengths of the insertion hole and the fastening bolts inserted into the insertion hole will also increase accordingly.

[0005] In this case, the contact position between the stator and the housing is the end of the stator in the drive shaft direction, so the distance from the opening of the housing to the fastening hole for fastening the fastening bolt becomes longer by the amount of the overall length of the stator. Therefore, the workability when inserting a tool through the opening of the housing to form the fastening hole in the housing deteriorates, and the manufacturing cost increases. In addition, since the fastening bolt is required to have a length according to the overall length of the stator, the fastening bolt cannot be shared with other electric compressors having different overall lengths of the stator, and the manufacturing cost increases.

[0006] The present disclosure has been made in consideration of the above circumstances, and aims to provide an electric compressor that can suppress increases in manufacturing costs even when the overall length of the stator is increased to improve motor output. [Means for solving the problem]

[0007] According to one aspect of the present disclosure, there is provided an electric compressor comprising: a housing formed in a cylindrical shape extending along an axis, the housing having an opening formed at one end along the axis and a bottom formed at the other end along the axis; a sealing member that seals the opening; a fastening member that generates a fastening force that brings the housing and the sealing member closer together along the axis; a compressor that is disposed on the opening side of the housing and rotates about the axis to compress a fluid; a motor that is disposed on the bottom side of the housing and drives the compressor to rotate about the axis; and an intermediate member that is disposed between the compressor and the motor along the axis, the motor comprising: a stator formed in a cylindrical shape along the axis; and a rotor that is disposed on an inner peripheral side of the stator, the stator being configured to rotate a fluid by the fastening member when a first end face on the bottom side is in contact with the housing and a second end face on the opening side is in contact with the intermediate member. and is transmitted from the sealing member through the compressor and the intermediate member. It is fixed to the housing by a fastening force.

[0008] A method for assembling an electric compressor according to one aspect of the present disclosure is a method for assembling an electric compressor, the electric compressor comprising: a housing formed in a cylindrical shape extending along an axis, the housing having an opening formed on one end side along the axis and a bottom portion formed on the other end side along the axis, a sealing member that seals the opening, a fastening member that generates a fastening force that brings the housing and the sealing member closer along the axis, a compressor that is disposed on the opening side of the housing and rotates about the axis to compress a fluid, a motor that is disposed on the bottom side of the housing and drives the compressor to rotate about the axis, and an intermediate member that is disposed between the compressor and the motor along the axis, the motor comprising: a stator formed in a cylindrical shape along the axis, and a fastening member that generates a fastening force that brings the housing and the sealing member closer along the axis, the fastening member generating a fastening force that brings the housing and the sealing member closer along the axis, a compressor that is disposed on the opening side of the housing and rotates about the axis to compress a fluid, a motor that is disposed on the bottom side of the housing and drives the compressor to rotate about the axis, and an intermediate member that is disposed between the compressor and the motor along the axis, and a rotor disposed on an inner circumferential side of a stator, the motor insertion process comprising: a motor insertion step of inserting the motor from the opening of the housing toward the bottom; an intermediate member insertion step of inserting the intermediate member from the opening of the housing into which the motor is inserted toward the bottom; a compressor insertion step of inserting the compressor from the opening of the housing into which the intermediate member is inserted toward the bottom; and a fastening step of fastening the housing into which the compressor is inserted and the sealing member with the fastening member to generate a fastening force that brings the housing and the sealing member close to each other along the axis, the fastening step being performed by generating a fastening force generated by the fastening member in a state in which a first end face of the stator on the bottom side is in contact with the housing and a second end face of the stator on the opening side is in contact with the intermediate member. and is transmitted from the sealing member through the compressor and the intermediate member. A clamping force secures the stator to the housing. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide an electric compressor capable of suppressing an increase in manufacturing costs even when the overall length of the stator is increased in order to improve the output of the motor. [Brief description of the drawings]

[0010] [Figure 1] 1 is a partial vertical cross-sectional view showing an electric compressor according to a first embodiment of the present disclosure. [Diagram 2] 2 is a cross-sectional view taken along the line AA of the electric compressor shown in FIG. [Diagram 3] 4 is a flowchart showing a method of assembling the electric compressor according to the first embodiment of the present disclosure. [Figure 4] FIG. 6 is a partial vertical cross-sectional view showing an electric compressor according to a second embodiment of the present disclosure. [Diagram 5] 5 is a cross-sectional view taken along the arrow BB of the electric compressor shown in FIG. 4. [Figure 6] 5 is a cross-sectional view taken along the line CC of the electric compressor shown in FIG. 4. [Figure 7] FIG. 11 is a partial vertical cross-sectional view showing an electric compressor according to a third embodiment of the present disclosure. [Figure 8] FIG. 8 is a cross-sectional view taken along the line DD of the electric compressor shown in FIG. [Figure 9] 8 is a cross-sectional view taken along line EE of the electric compressor shown in FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] [First embodiment] Hereinafter, an electric compressor 100 according to a first embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a partial vertical cross-sectional view showing the electric compressor according to the present embodiment. Fig. 2 is a cross-sectional view taken along the line AA of the electric compressor 100 shown in Fig. 1.

[0012] The electric compressor 100 of this embodiment is a device that compresses a refrigerant (fluid) sucked through a suction port P1 and discharges the refrigerant from a discharge port P2 to the outside. As shown in Fig. 1, the electric compressor 100 of this embodiment includes a housing 10, an end housing (sealing member) 20, a fastening bolt (fastening member) 21, a compressor 30, a motor 40, a first bearing 60, a second bearing 70, a retaining portion (intermediate member) 80, and an inverter 90.

[0013] The housing 10 is a member formed in a substantially cylindrical shape extending along the axis X, and accommodates the compressor 30 and the motor 40 therein. The housing 10 is formed of a metal material such as an aluminum alloy. The housing 10 has an opening 11 formed on the end housing 20 side along the axis X, and a bottom 12 formed on the inverter 90 side along the axis X.

[0014] 1, a suction port P1 is provided on the outer peripheral surface of the housing 10 near the bottom 12. The refrigerant supplied from the outside is introduced into the housing 10 from the suction port P1. The refrigerant introduced into the housing 10 flows along the axis X from the bottom 12 toward the opening 11.

[0015] The end housing 20 is a member that seals the opening 11 of the housing 10 when the compressor 30 and the motor 40 are inserted into the housing 10 through the opening 11. The end housing 20 is fixed to the housing 10 by fastening fastening bolts 21 into fastening holes (not shown) formed in the opening 11 of the housing 10. The opening 11, which is located at the end of the housing 10 on the compressor 30 side along the axis X, is sealed by the end housing 20.

[0016] The fastening bolt 21 is a member that generates a fastening force that brings the housing 10 and the end housing 20 closer together along the axis X. The fastening bolt 21 has a shaft portion that extends along the axis X, and is inserted into insertion holes (not shown) that are provided at multiple locations in the circumferential direction about the axis X of the end housing 20. A male thread is formed on the outer circumferential surface of the fastening bolt 21.

[0017] A fastening hole (not shown) extending along the axis X is formed in the housing 10 at a position facing the insertion hole of the end housing 20. A female thread is formed on the inner peripheral surface of the fastening hole, and is adapted to engage with a male thread of the fastening bolt 21. The fastening bolt 21 is inserted into the insertion hole of the end housing 20 and fastened to the fastening hole of the housing 10, thereby generating a fastening force that brings the housing 10 and the end housing 20 closer together along the axis X.

[0018] The compressor 30 is a device disposed on the opening 11 side inside the housing 10 and rotates about the axis X to compress a fluid. The compressor 30 includes a scroll compression mechanism that compresses a refrigerant by causing an orbiting scroll 32, which is combined with a fixed scroll 31, to perform an orbital motion about the axis X. The fixed scroll 31 is sandwiched and fixed between the end housing 20 and the retaining portion 80 with the opening 11 sealed by the end housing 20.

[0019] The compressor 30 sucks in and compresses the refrigerant introduced into the housing 10 from the suction port P1, and guides the compressed refrigerant to a discharge port P2 provided in the end housing 20. The refrigerant guided to the discharge port P2 is supplied to the outside via a pipe (not shown) connected to the discharge port P2.

[0020] The motor 40 is a device disposed on the bottom 12 side of the housing 10 and drives the compressor 30 to rotate about the axis X. The motor 40 has a stator 41, a rotor 42, a drive shaft 43, and a bobbin 44 and a bobbin 45.

[0021] Stator 41 is a member formed in a cylindrical shape along axis X, and is configured by laminating a predetermined number of electromagnetic steel sheets that are stamped and formed into an annular shape. Stator 41 has a coil winding (not shown) wound around each of a plurality of teeth (not shown) via bobbins 44 and 45.

[0022] The rotor 42 is disposed with a predetermined gap provided on the inner peripheral side of the stator 41. The rotor 42 is formed by laminating a predetermined number of electromagnetic steel sheets that are punched and formed into an annular shape.

[0023] The drive shaft 43 is inserted into a through hole formed in the center of the rotor 42, connected to the rotor 42, and is a member disposed on the axis X. The drive shaft 43 rotates integrally with the rotor 42 about the axis X, and transmits a driving force for rotating about the axis X to the compressor 30. An end of the drive shaft 43 on the opening 11 side is supported by a first bearing 60 so as to be rotatable about the axis X. An end of the drive shaft 43 on the bottom 12 side is supported by a second bearing 70 so as to be rotatable about the axis X.

[0024] The retaining portion 80 is a member formed in an annular shape around the axis X and configured to retain the first bearing 60. The retaining portion 80 is disposed between the compressor 30 and the motor 40 along the axis X. As shown in FIG. 1, the retaining portion 80 has a protruding portion 80a that abuts against the second end face 41b of the stator 41. As shown in FIG. 2, the protruding portions 80a are provided at a plurality of locations spaced apart from one another in the circumferential direction CD around the axis X.

[0025] 2, the protrusions 80a are provided at six locations at 60 degree intervals in the circumferential direction CD about the axis X, but other configurations are also possible. For example, they may be provided at angular intervals other than 60 degrees (30 degrees, 120 degrees, etc.). In addition, the intervals at which the multiple protrusions 80a are arranged along the circumferential direction CD do not have to be equal.

[0026] 1, with the opening 11 of the housing 10 sealed by the end housing 20, the retaining portion 80 has the multiple protrusions 80a in contact with the second end face 41b of the stator 41 and an end face on the opening 11 side in contact with the fixed scroll 31 of the compressor 30. By fixing the end housing 20 to the housing 10, the retaining portion 80 is sandwiched between the stator 41 and the fixed scroll 31, and its position in the direction of the axis X is fixed.

[0027] The inverter 90 is a device that converts DC power supplied from an external power source into AC power and applies the AC power to the motor 40 to rotate the motor 40. The inverter 90 is disposed in a space isolated from the sealed space formed inside the housing 10.

[0028] Next, a method for assembling the electric compressor 100 according to this embodiment will be described with reference to Fig. 3. Fig. 3 is a flowchart showing the method for assembling the electric compressor 100 according to this embodiment.

[0029] In step S101 (motor insertion step), an operator inserts the motor 40 from the opening 11 of the housing 10 toward the bottom 12. In step S102 (holding portion inserting step; intermediate member inserting step), the worker inserts the holding portion 80 from the opening 11 of the housing 10 toward the bottom portion 12.

[0030] In step S103 (compressor insertion step), the worker inserts the compressor 30 from the opening 11 of the housing 10 toward the bottom 12. In step S104 (fastening step), the worker inserts the end housing toward the holding portion 80, and brings the end face 20a of the end housing 20 on the housing 10 side and the end face 10a of the housing 10 on the end housing 20 side into close proximity.

[0031] The worker also inserts the fastening bolt 21 into the insertion hole of the end housing 20 and fastens the male thread of the fastening bolt 21 into the female thread of the fastening hole provided in the housing 10. By fastening the fastening bolt 21 and bringing the end face 20a of the end housing 20 into contact with the end face 10a of the housing 10, an annular seal area extending around the axis X is formed. By forming the annular seal area, a sealed state is created in which the internal space of the housing 10 does not communicate with the external space.

[0032] In the electric compressor 100 of this embodiment, in a sealed state, the stator 41, the retaining portion 80, and the fixed scroll 31 are fixed with a predetermined surface pressure applied between the housing 10 and the end housing 20. That is, as the fastening bolt 21 is rotated to shorten the distance between the end housing 20 and the housing 10, the fixed scroll 31 comes into contact with the retaining portion 80, the protruding portion 80a of the retaining portion 80 comes into contact with the second end face 41b of the stator 41, and the first end face 41a of the stator 41 comes into contact with the housing 10.

[0033] In this contact state, the first end face 41a of the stator 41 on the bottom 12 side of the housing 10 contacts the housing 10, and the second end face 41b on the opening 11 side of the housing 10 contacts the retaining portion 80. The stator 41 is fixed to the housing 10 by the fastening force generated by the fastening bolts 21. The stator 41 is fixed to the housing 10 because the fastening force generated by the fastening bolts 21 is transmitted to the stator 41 via the fixed scroll 31 and the retaining portion 80.

[0034] In this manner, in the fastening process (S104), the stator 41 is fixed to the housing 10 by the fastening force generated by the fastening bolt 21 with the first end face 41a on the bottom 12 side of the stator 41 in contact with the housing 10 and the second end face 41b on the opening 11 side of the stator 41 in contact with the retaining portion 80.

[0035] The electric compressor 100 of the present embodiment described above provides the following functions and effects. According to the electric compressor 100 of this embodiment, in order to fix the stator 41 to the housing 10, it is not necessary to form an insertion hole in the stator 41, to use a fastening bolt longer than the insertion hole, or to form a fastening hole in the housing 10 for fastening the fastening bolt. Therefore, it is possible to suppress a decrease in magnetic flux density in the iron core caused by forming an insertion hole in the stator 41 and an associated decrease in output of the motor 40. Also, since it is not necessary to prepare a fastening bolt with a length corresponding to the overall length of the stator 41, an increase in manufacturing costs can be suppressed.

[0036] Furthermore, since there is no need to form fastening holes in the housing 10, even if the overall length of the stator 41 is increased, the workability is not deteriorated, and an increase in manufacturing costs can be suppressed. Therefore, it is possible to provide the electric compressor 100 that can suppress an increase in manufacturing costs even if the overall length of the stator 41 is increased to improve the output of the motor 40.

[0037] According to the electric compressor 100 of this embodiment, the first bearing 60, which supports the drive shaft 43 connected to the rotor 42, is held by the holding portion 80. The stator 41 of the motor 40 is fixed to the housing 10 by a fastening force generated by the fastening bolts 21, with the first end face 41a on the bottom 12 side being in contact with the housing 10 and the second end face 41b on the opening 11 side being in contact with the holding portion 80. Since the stator 41 is fixed via the holding portion 80 which holds the first bearing 60, it is possible to prevent the device from becoming larger in size, compared to the case where a member other than the holding portion 80 is interposed.

[0038] Second Embodiment Next, an electric compressor 100A according to a second embodiment of the present disclosure will be described with reference to the drawings. Fig. 4 is a partial vertical cross-sectional view showing the electric compressor 100A according to this embodiment. Fig. 5 is a cross-sectional view taken along line BB of the electric compressor 100A shown in Fig. 4. Fig. 6 is a cross-sectional view taken along line CC of the electric compressor 100A shown in Fig. 4. This embodiment is a modified example of the first embodiment, and is the same as the first embodiment except as otherwise described below, and therefore further description will be omitted.

[0039] In the electric compressor 100 of the first embodiment, the holding portion 80 serving as an intermediate member disposed between the stator 41 and the compressor 30 is formed of a single member. In contrast, the holding portion 80A of the present embodiment is configured of two members, a first holding member 81 and a second holding member 82.

[0040] 4, the retaining portion 80A of the present embodiment includes a first retaining member 81 that retains the first bearing 60 and is disposed closer to the opening 11 than the second retaining member 82, and a second retaining member 82 that is disposed between the stator 41 and the first retaining member 81 along the axis X. The second retaining member 82 has a function of transmitting the fastening force generated by the fastening bolt 21 from the first retaining member 81 to the stator 41.

[0041] 5, the second holding member 82 is a member formed in an annular shape along the circumferential direction about the axis X. As shown in FIG. 4, an end face of the second holding member 82 on the bottom 12 side contacts the second end face 41b of the stator 41, and an end face of the second holding member 82 on the opening 11 side contacts the protruding portion 81a of the first holding member 81.

[0042] As shown in Fig. 4, the first holding member 81 has a protrusion 81a that abuts against the second holding member 82. As shown in Fig. 6, the protrusions 81a are provided at multiple locations spaced apart in the circumferential direction CD about the axis X.

[0043] 6, the protrusions 81a are provided at six locations at 60 degree intervals in the circumferential direction CD about the axis X, but other configurations are also possible. For example, the protrusions 81a may be provided at intervals of angles other than 60 degrees (30 degrees, 120 degrees, etc.). In addition, the intervals at which the multiple protrusions 81a are arranged along the circumferential direction CD do not have to be equal.

[0044] As shown in Figure 4, when the opening 11 of the housing 10 is sealed by the end housing 20, the multiple protrusions 81a of the first retaining member 81 contact the end face of the second retaining member 82 on the opening 11 side, and the end face of the first retaining member 81 on the opening 11 side contacts the fixed scroll 31 of the compressor 30.

[0045] Additionally, an end face of the second retaining member 82 on the bottom 12 side contacts the second end face 41b of the stator 41, and an end face of the second retaining member 82 on the opening 11 side contacts the protruding portion 81a of the first retaining member 81. By fixing the end housing 20 to the housing 10, the position of the retaining portion 80A in the direction of the axis X is fixed while being sandwiched between the stator 41 and the fixed scroll 31.

[0046] In the electric compressor 100A of the present embodiment, in a sealed state, the stator 41, the retaining portion 80A, and the fixed scroll 31 are fixed with a predetermined surface pressure applied between the housing 10 and the end housing 20. That is, as the fastening bolt 21 is rotated to shorten the distance between the end housing 20 and the housing 10, the fixed scroll 31 comes into contact with the retaining portion 80A, the protruding portion 81a of the first retaining member 81 comes into contact with the second retaining member 82, the second retaining member 82 comes into contact with the second end face 41b of the stator 41, and the first end face 41a of the stator 41 comes into contact with the housing 10.

[0047] In this contact state, the first end face 41a of the stator 41 on the bottom 12 side of the housing 10 contacts the housing 10, and the second end face 41b on the opening 11 side of the housing 10 contacts the retaining portion 80A. The stator 41 is fixed to the housing 10 by the fastening force generated by the fastening bolts 21. The stator 41 is fixed to the housing 10 because the fastening force generated by the fastening bolts 21 is transmitted to the stator 41 via the fixed scroll 31 and the retaining portion 80A.

[0048] According to the electric compressor 100A of the present embodiment, since the second holding member 82 is a member different from the first holding member 81, the first holding member 81 can be made common when manufacturing a plurality of models having different lengths of the stator 41. In other words, when the first holding member 81 having the same length in the axial direction X is to be common among a plurality of models, it is sufficient to prepare a second holding member 82 having a length in the axial direction X that matches the overall length of the stator 41.

[0049] Third Embodiment Next, an electric compressor 100B according to a third embodiment of the present disclosure will be described with reference to the drawings. Fig. 7 is a partial vertical cross-sectional view showing the electric compressor 100B according to this embodiment. Fig. 8 is a cross-sectional view taken along the line DD of the electric compressor 100B shown in Fig. 7. Fig. 9 is a cross-sectional view taken along the line EE of the electric compressor 100B shown in Fig. 7. This embodiment is a modification of the first and second embodiments, and is similar to the first and second embodiments except as otherwise described below, and therefore further description will be omitted.

[0050] The holding portion 80A of the electric compressor 100A in the second embodiment is configured by two members, the first holding member 81 and the second holding member 82. In addition, the second holding member 82 is formed in an annular shape and is not attached to another member by a mounting member or the like.

[0051] In contrast, the holding portion 80B of the electric compressor 100B of the present embodiment is configured by two members, a first holding member 83 and a second holding member 84. Moreover, the second holding member 84 is not formed in an annular shape but is a member separated into multiple parts, and is attached to the housing 10 by fastening bolts (attachment members) 50.

[0052] As shown in FIG. 7, the retaining portion 80B of the present embodiment includes a first retaining member 83 that holds the first bearing 60 and is positioned closer to the opening 11 than the second retaining member 84, and a second retaining member 84 that is positioned between the stator 41 and the first retaining member 83 along the axis X.

[0053] 8, the second holding member 84 is disposed at a plurality of locations spaced apart from one another in the circumferential direction about the axis X. As shown in FIG. 7, an end face of the second holding member 84 on the bottom 12 side contacts the second end face 41b of the stator 41, and an end face of the second holding member 84 on the opening 11 side contacts the protruding portion 83a of the first holding member 83.

[0054] 7, the second retaining member 84 has a through hole 84a extending along the axis X. A fastening hole 51 having a female thread formed on the inner circumferential surface is formed in the end face of the housing 10 facing the through hole 84a. The second retaining member 84 is attached to the housing 10 by fastening a fastening bolt 50 inserted into the through hole 84a to the fastening hole 51.

[0055] 7, the first holding member 83 has a protrusion 83a that abuts against the second holding member 84. As shown in Fig. 9, the protrusions 83a are provided at multiple locations spaced apart in the circumferential direction CD about the axis X.

[0056] 9, the protrusions 83a are provided at six locations at 60 degree intervals in the circumferential direction CD about the axis X, but other configurations are also possible. For example, the protrusions may be provided at angular intervals other than 60 degrees (30 degrees, 120 degrees, etc.). The multiple protrusions 83a do not have to be arranged at equal intervals along the circumferential direction CD. However, the multiple protrusions 83a are arranged at the same positions as the second holding member 84 in the circumferential direction CD.

[0057] As shown in Figure 7, when the opening 11 of the housing 10 is sealed by the end housing 20, the multiple protrusions 83a of the first retaining member 83 contact the end face of the second retaining member 84 on the opening 11 side, and the end face of the first retaining member 83 on the opening 11 side contacts the fixed scroll 31 of the compressor 30.

[0058] Additionally, an end face of the second retaining member 84 on the bottom 12 side contacts the second end face 41b of the stator 41, and an end face of the second retaining member 84 on the opening 11 side contacts the protrusion 83a of the first retaining member 83. By fixing the end housing 20 to the housing 10, the position of the retaining portion 80B in the direction of the axis X is fixed while being sandwiched between the second retaining member 84 and the fixed scroll 31.

[0059] In the electric compressor 100B of this embodiment, in a sealed state, the first retaining member 83 and the fixed scroll 31 are fixed with a predetermined surface pressure being applied between the second retaining member 84 and the end housing 20. That is, as the fastening bolt 21 is rotated to shorten the distance between the end housing 20 and the housing 10, the fixed scroll 31 comes into contact with the retaining portion 80B, and the protruding portion 83a of the first retaining member 83 comes into contact with the second retaining member 84.

[0060] In this contact state, the first end face 41a of the stator 41 on the bottom 12 side of the housing 10 contacts the housing 10, and the second end face 41b on the opening 11 side of the housing 10 contacts the second holding member 84. The stator 41 is fixed to the housing 10 by the fastening force generated by the fastening bolts 50. The stator 41 is fixed to the housing 10 because the fastening force generated by the fastening bolts 50 is transmitted to the stator 41 via the second holding member 84.

[0061] According to the electric compressor 100B of the present embodiment, since the second holding member 84 is a member different from the first holding member 83, the first holding member 83 can be made common when manufacturing a plurality of models having different lengths of the stator 41. In other words, when the first holding member 83 having the same length in the axial direction X is to be common among a plurality of models, it is sufficient to prepare a second holding member 84 having a length in the axial direction X that matches the overall length of the stator 41.

[0062] According to the electric compressor 100B of this embodiment, the second retaining member 84 is attached to the housing 10 by the fastening bolts 50, and therefore the effect of variation in the length of the stator 41 on the fixed position of the second retaining member 84 in the direction of the axis X is reduced compared to the case where the end face of the second retaining member 84 on the bottom 12 side is in contact with only the second end face 41b of the stator 41 (electric compressor 100A of the second embodiment). Therefore, variation in the fixed positions of the first retaining member 83 and the fixed scroll in the direction of the axis X is also reduced, and the contact pressure and fixing force applied to the second retaining member 84 and the fixed scroll between the housing 10 and the end housing 20 by the fastening force of the fastening bolts 21 are stabilized, making it possible to prevent leakage of refrigerant gas and abnormal vibration of the compressor 30 due to insufficient contact pressure.

[0063] The electric compressor according to the present embodiment described above can be understood, for example, as follows. The electric compressor (100) according to the present disclosure includes a housing (10) formed in a cylindrical shape extending along an axis (X) and having an opening (11) formed on one end side along the axis and a bottom portion (12) formed on the other end side along the axis, a sealing member (20) that seals the opening, a fastening member (21) that generates a fastening force that brings the housing and the sealing member close to each other along the axis, a compressor (30) that is disposed on the opening side of the housing and rotates about the axis to compress a fluid, and a fastening member (22) that fastens the housing and the sealing member to the bottom of the housing. the motor includes a stator (41) formed in a cylindrical shape along the axis, and a rotor (42) arranged on the inner peripheral side of the stator, and the stator is fixed to the housing by a fastening force generated by the fastening member with a first end face on the bottom side in contact with the housing and a second end face on the opening side in contact with the intermediate member.

[0064] In the electric compressor according to the present disclosure, the housing has a motor disposed on the bottom side, a compressor disposed on the opening side, an intermediate member disposed between the compressor and the motor, and the opening sealed by a sealing member. The fastening member generates a fastening force that brings the housing and the sealing member closer together along the axis. The stator of the motor is fixed to the housing by the fastening force generated by the fastening member with a first end face on the bottom side in contact with the housing and a second end face on the opening side in contact with the intermediate member.

[0065] According to the electric compressor of the present disclosure, in order to fix the stator to the housing, it is not necessary to form an insertion hole in the stator, to use a fastening bolt longer than the insertion hole, or to form a fastening hole in the housing for fastening the fastening bolt. Therefore, it is possible to suppress a decrease in magnetic flux density in the iron core caused by forming an insertion hole in the stator and an associated decrease in motor output. In addition, since it is not necessary to prepare a fastening bolt with a length corresponding to the entire length of the stator, an increase in manufacturing costs can be suppressed.

[0066] Furthermore, since there is no need to form fastening holes in the housing, even if the overall length of the stator is increased, workability is not deteriorated, and an increase in manufacturing costs can be suppressed. Therefore, it is possible to provide an electric compressor that can suppress an increase in manufacturing costs even if the overall length of the stator is increased to improve the output of the motor.

[0067] In the electric compressor according to the present disclosure, the motor may have a drive shaft (43) connected to the rotor and arranged on the axis, and a bearing (60) that rotatably supports the drive shaft, and the intermediate member may be a retaining portion (80) that retains the bearing.

[0068] In the electric compressor having this configuration, the bearing that supports the drive shaft connected to the rotor is held by the holding part. The stator of the motor is fixed to the housing by fastening force generated by the fastening member with a first end face on the bottom side in contact with the housing and a second end face on the opening side in contact with the holding part. Since the stator is fixed via the holding part that holds the bearing, it is possible to prevent the device from becoming large in size compared to a case in which a member other than the holding part is interposed.

[0069] In the electric compressor having the above configuration, the retaining portion (80) may be configured to include a first retaining member (81) that retains the bearing (60) and is arranged on the opening (11) side, and a second retaining member (82) that is arranged between the stator (41) and the first retaining member (81) along the axis (X).

[0070] According to the electric compressor having this configuration, since the second holding member is a member different from the first holding member, when manufacturing a plurality of models with different stator lengths, the first holding member can be made common. In other words, when a first holding member having the same axial length is to be common among a plurality of models, it is sufficient to prepare a second holding member having an axial length that matches the overall length of the stator.

[0071] In the electric compressor having the above configuration, the second holding member (82) may be attached to the housing (10) by a mounting member (50). According to the electric compressor of this configuration, the second holding member is attached to the housing by the mounting member, so that when the compressor, etc. is housed in the housing and sealed by the sealing member, the fastening force of the fastening bolts 21 can stabilize the surface pressure and fixing force applied to the compressor, etc., thereby preventing refrigerant gas leakage and abnormal vibration. There is no need for an operator to position the second holding member. This makes it easier to assemble the electric compressor.

[0072] The method of assembling the electric compressor according to the present embodiment described above can be understood, for example, as follows. An assembly method for an electric compressor according to the present disclosure is a method for assembling an electric compressor, the electric compressor comprising: a housing formed in a cylindrical shape extending along an axis, and having an opening formed at one end along the axis and a bottom formed at the other end along the axis, a sealing member that seals the opening, a fastening member that generates a fastening force that brings the housing and the sealing member closer along the axis, a compressor that is disposed on the opening side of the housing and rotates about the axis to compress a fluid, a motor that is disposed on the bottom side of the housing and rotates the compressor about the axis, and an intermediate member that is disposed between the compressor and the motor along the axis, the motor comprises a stator formed in a cylindrical shape along the axis, and a rotor that is disposed on an inner circumferential side of the stator, the housing having the motor inserted therein from the opening toward the bottom; an intermediate member inserting process (S102) of inserting the intermediate member from the opening of the housing into which the motor has been inserted toward the bottom; a compressor inserting process (S103) of inserting the compressor from the opening of the housing into which the intermediate member has been inserted toward the bottom; and a fastening process (S104) of fastening the housing into which the compressor has been inserted and the sealing member with the fastening member to generate a fastening force that brings the housing and the sealing member close to each other along the axis, wherein the fastening process fixes the stator to the housing by the fastening force generated by the fastening member with a state in which a first end face of the stator on the bottom side is in contact with the housing and a second end face of the stator on the opening side is in contact with the intermediate member.

[0073] According to the method of assembling an electric compressor disclosed herein, a motor is disposed on the bottom side of a housing, a compressor is disposed on the opening side, an intermediate member is disposed between the compressor and the motor, and the opening is sealed by a sealing member. In a fastening step, the fastening member generates a fastening force that brings the housing and the sealing member closer together along the axis. Through the fastening step, a stator of the motor is fixed to the housing by the fastening force generated by the fastening member with a first end face on the bottom side in contact with the housing and a second end face on the opening side in contact with the intermediate member.

[0074] According to the method for assembling an electric compressor according to the present disclosure, in order to fix the stator to the housing, it is not necessary to form an insertion hole in the stator, to use a fastening bolt longer than the insertion hole, or to form a fastening hole in the housing for fastening the fastening bolt. Therefore, it is possible to suppress a decrease in magnetic flux density in the iron core caused by forming an insertion hole in the stator and an associated decrease in motor output. In addition, since it is not necessary to prepare a fastening bolt with a length corresponding to the entire length of the stator, it is possible to suppress an increase in manufacturing costs.

[0075] Furthermore, since there is no need to form fastening holes in the housing, even if the overall length of the stator is increased, the workability is not deteriorated, and an increase in manufacturing costs can be suppressed. Therefore, it is possible to provide a method for assembling an electric compressor that can suppress an increase in manufacturing costs even if the overall length of the stator is increased to improve the output of the motor. [Explanation of symbols]

[0076] 10. Housing 11 Opening 12 Bottom 20 End housing (sealing member) 21 Fastening bolt (fastening member) 30 Compressor 40 Motor 41 Stator 41a 1st end surface 41b 2nd end face 42 Rotor 43 Drive shaft 50 Fastening bolt 51 Fastening holes 60 No. 1 bearing 70 No. 2 bearing 80,80A,80B Holding part 80a,81a,83a protrusion 81, 83 First holding member 82, 84 Second retaining member 100, 100A, 100B Electric Compressor CD circumferential direction X axis

Claims

1. a housing formed in a cylindrical shape extending along an axis and having an opening formed on one end side along the axis and a bottom portion formed on the other end side along the axis; a sealing member that seals the opening; a fastening member that generates a fastening force that brings the housing and the sealing member closer together along the axis; a compressor that is disposed on the opening side of the housing and rotates about the axis to compress a fluid; a motor disposed on the bottom side of the housing and configured to rotate the compressor about the axis; an intermediate member disposed between the compressor and the motor along the axis, The motor includes a stator formed in a cylindrical shape along the axis and a rotor disposed on an inner peripheral side of the stator, The stator is an electric compressor in which a first end face on the bottom side is in contact with the housing and a second end face on the opening side is in contact with the intermediate member, and the stator is fixed to the housing by a fastening force generated by the fastening member and transmitted from the sealing member through the compressor and the intermediate member.

2. a housing formed in a cylindrical shape extending along an axis and having an opening formed on one end side along the axis and a bottom portion formed on the other end side along the axis; a sealing member that seals the opening; a fastening member that generates a fastening force that brings the housing and the sealing member closer together along the axis; a compressor that is disposed on the opening side of the housing and rotates about the axis to compress a fluid; a motor disposed on the bottom side of the housing, for driving the compressor to rotate about the axis, the motor including a stator formed in a cylindrical shape along the axis, a rotor disposed on the inner periphery of the stator, and a drive shaft connected to the rotor and disposed on the axis; an intermediate member disposed between the compressor and the motor along the axis; a bearing that rotatably supports the drive shaft, the stator is fixed to the housing by a fastening force generated by the fastening member in a state in which a first end surface on the bottom side is in contact with the housing and a second end surface on the opening side is in contact with the intermediate member, The intermediate member is a holding portion that holds the bearing.

3. 3. The electric compressor according to claim 2, wherein the retaining portion includes a first retaining member that holds the bearing and is arranged on the opening side, and a second retaining member that is arranged between the stator and the first retaining member along the axis.

4. The electric compressor according to claim 3 , wherein the second holding member is attached to the housing by a mounting member.

5. A method for assembling an electric compressor, comprising the steps of: The electric compressor includes: a housing formed in a cylindrical shape extending along an axis and having an opening formed on one end side along the axis and a bottom portion formed on the other end side along the axis; a sealing member that seals the opening; a fastening member that generates a fastening force that brings the housing and the sealing member closer together along the axis; a compressor that is disposed on the opening side of the housing and rotates about the axis to compress a fluid; a motor disposed on the bottom side of the housing and configured to rotate the compressor about the axis; an intermediate member disposed between the compressor and the motor along the axis, The motor includes a stator formed in a cylindrical shape along the axis and a rotor disposed on an inner peripheral side of the stator, a motor insertion step of inserting the motor from the opening of the housing toward the bottom; an intermediate member inserting step of inserting the intermediate member from the opening of the housing into which the motor is inserted toward the bottom; a compressor inserting step of inserting the compressor from the opening of the housing into which the intermediate member has been inserted toward the bottom; a fastening step of fastening the housing, into which the compressor is inserted, and the sealing member with the fastening member to generate a fastening force that brings the housing and the sealing member closer to each other along the axis, The fastening process is a method for assembling an electric compressor, in which a first end face on the bottom side of the stator is in contact with the housing and a second end face on the opening side of the stator is in contact with the intermediate member, and the stator is fixed to the housing by a fastening force generated by the fastening member and transmitted from the sealing member through the compressor and the intermediate member.

Images