JP5912950B2 - Electric compressor - Google Patents

Description

  The present invention relates to an electric compressor that includes an electric motor unit and a compressor, and the compressor compresses refrigerant by driving the electric motor unit.

  The electric compressor includes an electric motor unit and a compressor in a cylindrical housing, and the electric motor unit operates to drive the compressor so that the compressor compresses the refrigerant. The housing is made of aluminum for weight reduction. The electric motor unit includes a stator in which a coil is wound around a stator core, and a rotor that is arranged inside the stator and rotates by a magnetic force generated by the stator.

  The stator is fixed to the inner peripheral wall of the housing, and is fixed to the cylindrical housing by shrink fitting as described in Patent Document 1. This is because the linear expansion coefficient is different between the stator and the housing, and therefore it is necessary to set a large tightening allowance in consideration of a temperature rise during use of the electric compressor. In such shrink fitting, the stator is fixed to the housing by heating the housing, inserting and positioning the stator core inside the housing, and then cooling and contracting the housing.

JP 2009-228546 A

  When the stator is fixed to the housing by shrink fitting as in Patent Document 1, there is a problem that the number of steps increases and the cost increases because the housing needs to be heated. Further, in shrink fitting, it is necessary to adjust the temperature so that the temperature of the resin parts such as the insulating plate incorporated in the stator and the O-ring incorporated in the rotating body is equal to or lower than the heat resistance temperature, and the work is complicated. It becomes. Moreover, there is a problem that it is difficult to secure a sufficient allowance.

  Therefore, the present invention can use press-fitting that does not require a complicated shrink-fitting process as a fixing method, and can be reliably performed in a state in which the generation of burrs (shaving powder) is suppressed during press-fitting. An object of the present invention is to provide an electric compressor capable of securing a tightening allowance and a method for assembling the electric compressor.

The invention according to claim 1 is a cylindrical housing, an electric motor portion fixed in the housing, and a compressor that is disposed in the housing and is driven by the rotational driving force of the electric motor portion to compress the refrigerant. And the electric motor unit is an electric compressor formed of a stator and a rotor, and the stator is fixed to an inner peripheral wall of the housing in the housing, and The stator is configured to generate a magnetic force when energized, and the rotor is rotatably disposed inside the stator and configured to rotate by the magnetic force generated by the stator. A guide member made of a thin plate material is provided on the outer periphery of the stator, and the stator is interposed between the guide member and the inner peripheral wall of the housing. Are constant, the guide member is characterized by comprising a guide curved surface for guiding the insertion into the housing of the stator.

  Invention of Claim 2 is the electric compressor of Claim 1, Comprising: The said guide curved surface part is a curved surface which goes to the center side of a stator from the insertion side edge part to the said housing inner side of the said stator. It is characterized by that.

The invention according to claim 3 is the electric compressor according to claim 1 or claim 2, wherein the guide member is inserted in the axial direction of the guide member when the stator is inserted into the housing. A shift prevention portion for preventing the shift is provided extending from the guide curved surface portion .

A fourth aspect of the present invention is the electric compressor according to any one of the first to third aspects, wherein the guide member includes a tightening margin portion, the guide curved surface portion, and a latch holding portion. The fastening margin is formed in an elongated shape along the axial direction of the stator, and the fastening margin is fixed to the inner peripheral wall of the housing in the housing. The guide curved surface portion extends from an insertion side end of the fastening margin portion, and the locking holding portion is opposite to the guide curved surface portion in order to attach the guide member to the stator. It is characterized by being provided at the end of the tightening margin .

  A fifth aspect of the present invention is the electric compressor according to any one of the first to fourth aspects, wherein the guide members are attached at equal intervals along a circumferential direction of the stator. It is characterized by being.

  A sixth aspect of the present invention is the electric compressor according to any one of the first to fifth aspects, wherein the housing faces the non-mounting outer periphery of the stator not provided with the guide member. The inner peripheral wall bulges to the outer peripheral side of the housing, and a gap is formed between the stator and the non-attached outer periphery of the stator.

  According to a seventh aspect of the present invention, there is provided a method for assembling an electric compressor, comprising a cylindrical housing, an electric motor portion fixed in the housing, and a rotational driving force of the electric motor portion disposed in the housing. And a compressor for compressing the refrigerant, wherein the electric motor unit is fixed to the housing by press-fitting into the inner peripheral wall of the housing and generates a magnetic force by energization, and is rotatable inside the stator. A method of assembling an electric compressor formed by a rotor that is arranged and rotated by a magnetic force generated by the stator, wherein the guide member is made of a thin plate material when the stator is press-fitted into the inner peripheral wall of the housing. Are provided in at least three places on the outer periphery of the stator, and the press-fitting of the stator into the inner peripheral wall of the housing is guided by the guide curved surface of the guide member.

  According to the first aspect of the present invention, the guide member provided with the guide curved surface portion is attached to the outer periphery of the stator, and the stator is press-fitted into the housing in this attached state, so that the corner portion of the stator hits the inner peripheral wall of the housing. It is possible to prevent the occurrence of burrs (shaving powder) that cause failure. Moreover, since it is possible to fix by press-fitting, a complicated shrink-fitting process can be eliminated. Furthermore, since the guide member is formed of a thin plate material, an increase in weight due to the attachment of the guide member can be reduced, and a high cost can be suppressed.

  According to the second aspect of the present invention, since the guide curved surface portion is a curved surface toward the center side of the stator, it is possible to reliably perform the guide when the stator is press-fitted into the housing.

  According to the third aspect of the present invention, since the guide member deviation preventing portion is provided, the guide member is not displaced when the stator is press-fitted into the housing, and the stator can be reliably press-fitted. .

  According to the fourth aspect of the present invention, the guide member is formed by the tightening margin, the guide curved surface portion, and the latch holding portion, and the tightening margin sufficiently secures the tightening margin when the stator is press-fitted. Securing, and the latch holding part secures the attachment state to the stator. For this reason, the press-fitting of the stator into the housing can be stabilized, and the guide member can be stably attached to the stator.

  According to the fifth aspect of the present invention, since the guide members are attached at equal intervals in the circumferential direction of the stator, it is possible to prevent the stator from being inclined and pressed into the housing.

  According to the sixth aspect of the present invention, a gap can be formed between the non-attached portion of the guide member in the stator and the housing, and the non-attached portion of the guide member does not contact the housing. Even in the non-attached portion, the shavings (burrs) of the housing 2 due to contact do not occur.

  According to the seventh aspect of the present invention, the guide member is attached to the outer periphery of the stator, and the press-fitting of the stator into the housing is guided by the guide curved surface of the guide member, so that the stator can be smoothly pressed into the housing. . For this reason, a complicated shrink fitting process can be made unnecessary.

It is a partial fracture perspective view showing the electric compressor of one embodiment of the present invention. It is sectional drawing which shows the press injection state of the stator to a housing. It is a perspective view which shows a stator. It is a perspective view which shows a guide member. It is sectional drawing and the partial expanded sectional view which show the press injection initial state of the stator to a housing. It is sectional drawing which shows the press injection completion state of the stator to a housing. It is an expanded sectional view which shows the press fit state of the stator to a housing. It is sectional drawing which shows the state which attached six guide members with respect to the stator, and was press-fit in the housing. It is sectional drawing which shows the modification of a guide member. It is sectional drawing which shows another modification of a guide member.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  1 to 7 show an electric compressor 1 according to an embodiment of the present invention, and FIG. 1 is a partially broken perspective view of the electric compressor 1 as a whole. As shown in FIG. 1, the electric compressor 1 includes a housing 2, an electric motor unit 3, a compressor 4, and a drive circuit unit 5.

  The housing 2 includes a front housing 2a, a middle housing 2b, and a rear housing 2c, and is entirely formed of aluminum in a cylindrical shape. These housings 2a, 2b, and 2c are connected to each other by bolts so that the entire housing 2 is hollow, and the electric motor unit 3, the compressor 4, and the drive circuit unit 5 are accommodated therein. .

  The drive circuit unit 5 controls the rotational speed of the electric motor unit 3 in accordance with a change in the thermal load of the compressor 4 and is accommodated in the front housing 2a. The electric motor unit 3 drives the compressor 4 and is accommodated in the middle housing 2b and the rear housing 2c. The compressor 4 is driven by the rotational driving force of the electric motor unit 3 to compress the refrigerant, and is accommodated in the rear housing 2c.

  The compressor 4 extends from an electric motor unit 3, a cylinder block 42 in which a cylinder chamber 41 having an elliptical inner wall surface is formed, a front side block 43 and a rear side block 44 that hold the cylinder block 42 in between. The rotor 45 is attached to the rotary drive shaft 31 and is rotatably accommodated in the center of the cylinder chamber 41. The rotary drive shaft 31 extends left and right within the housing 2, and both end portions thereof are supported by the middle housing 2 b and the rear side block 44 so as to be rotatable within the housing 2.

  A plurality of vane grooves 47 are formed on the outer periphery of the rotor 45 at equal intervals in the circumferential direction, and the vanes 46 are housed in the respective vane grooves 47 so as to be able to appear and retract. When the rotor 45 rotates, the vane 46 is subjected to centrifugal force and oil back pressure supplied to the bottom of the vane groove 47 and moves forward and backward with respect to the vane groove 47, and the top part slides on the inner wall surface of the cylinder chamber 41 by advancement. Move. The cylinder chamber 41 is divided into a plurality of compression chambers by the vanes 46. The volume of each compression chamber increases / decreases as the rotor 45 rotates and the vane 46 advances / retreats, and the refrigerant suction stroke, compression stroke, and discharge stroke are repeated according to the volume increase / decrease. In the stroke, the refrigerant compressed in the compression step is discharged from the discharge port.

  The electric motor unit 3 is formed by a stator 32 fixed to the housing 2 by being press-fitted into a rear housing 2c (hereinafter referred to as the housing 2), and a rotor 33 rotatably disposed inside the stator 32. Yes.

  As shown in FIGS. 1 to 3, the stator 32 has a plurality of coils 35 wound around a stator core 34 having a cylindrical outer shape. The coil 35 is wound around the stator core 34 through a thin insulator 36 made of an insulating material, and a magnetic force is generated by energizing the coil 35 from the drive circuit unit 5.

  The rotor 33 is attached to the rotation drive shaft 31. The rotor 33 is provided with a plurality of permanent magnets corresponding to the coils 35 of the stator 32 on the outer peripheral side, and rotates by receiving the magnetic force from the stator 32. The rotation drive shaft 31 is rotated by this rotation, and the rotor 45 of the compressor 4 is rotated by the rotation of the rotation drive shaft 31.

  The stator core 34 of the stator 32 is formed of a laminated steel plate obtained by laminating thin ring-shaped steel plates, and the stator 32 is fixed to the housing 2 by being press-fitted into the inner peripheral wall 2d of the housing 2 made of aluminum. The guide member 11 is attached to the stator 32 for press-fitting into the inner peripheral wall 2d of the housing 2.

  As shown in FIGS. 2 and 3, the guide member 11 is attached to a plurality of locations (three locations in this embodiment) at equal intervals in the circumferential direction with respect to the outer periphery of the stator 32 (stator core 34). The guide member 11 performs guidance when the stator 32 is press-fitted into the housing 2.

  As shown in FIG. 4, the guide member 11 is formed by a plurality of (four) guide pieces 12 extending along the press-fitting direction (vertical direction), and a connecting piece 13 provided integrally with the guide piece 12. ing. The connecting piece 13 is provided at a plurality of places (two places) along the length direction of the guide piece 12 and connects adjacent guide pieces 12 at a plurality of places in the length direction. By connecting the plurality of guide pieces 12 by the connecting pieces 13 in this way, the entire guide member 11 has a bowl shape. Since such a guide member 11 can be formed in an arc shape along the outer peripheral wall of the arc-shaped stator 32, it can be attached along the outer surface of the stator 32.

  The guide member 11 is created by pressing a thin steel plate. Thereby, the weight increase at the time of providing the guide member 11 can be reduced, and a cost increase can be suppressed.

  As shown in FIGS. 4 to 7, the guide piece 12 of the guide member 11 is formed to have substantially the same length as the axial length of the stator 32 (stator core 34) made of laminated steel plates. Each guide piece 12 has a fastening margin 14 formed in a long shape along the axial direction of the stator 32, and a guide curved surface portion extending from the insertion side end (lower end) of the fastening margin 14. 15, and a locking holding portion 16 provided at an end portion (upper end portion) of the tightening margin portion 14 on the opposite side to the guide curved surface portion 15.

  The fastening margin 14 has a flat plate shape and is press-fitted into the inner peripheral wall 2 d of the housing 2 when the stator 32 is press-fitted into the housing 2. Accordingly, the stator 32 can be pressed into the inner peripheral wall 2 d of the housing 2 without the outer peripheral wall of the stator 32 contacting the inner peripheral wall 2 d of the housing 2.

  The guide curved surface portion 15 is formed by a curved surface that is curved and extended from the lower end portion of the fastening margin portion 14 toward the center side of the stator 32. A tapered portion 17 is formed on the curved surface portion of the guide curved surface portion 15. The tapered portion 17 is linearly inclined from the inner peripheral wall 2 d of the housing 2 toward the axial direction of the stator 32, and acts to guide when the stator 32 is press-fitted into the housing 2. By providing such a guide curved surface portion 15, the corner portion of the stator 32 does not directly contact the inner peripheral wall 2 d of the housing 2 when the stator 32 is press-fitted into the inner peripheral wall 2 d of the housing 2. Cutting powder is not generated. Thereby, the failure resulting from the generation of shavings can be prevented.

  The extended end portion of the guide curved surface portion 15 serves as a displacement prevention portion 18 that comes into contact with and is locked to the insertion side end portion (lower end portion) of the stator 32. The deviation preventing portion 18 abuts against the insertion side end portion of the stator 32 to prevent the guide member 11 from being displaced in the axial direction when being pressed into the inner peripheral wall 2d of the housing 2.

  The locking holding portion 16 is integrally formed with the fastening margin portion 14 so as to be directed to the center side of the stator 32 at the end opposite to the guide curved surface portion 15. The locking holding portion 16 is curved in a U shape from the end of the tightening margin 14, thereby providing springiness, and the end (upper end) of the stator 32 opposite to the insertion side end by the spring force. Part). Thereby, the guide member 11 is not detached from the stator 32, and the guide member 11 can be attached to the stator 32.

  As shown in FIG. 2, the inner peripheral wall 2 d of the housing 2 facing the outer peripheral portion of the stator 32 to which the guide member 11 is not attached is formed to bulge to the outer peripheral side (outside) of the housing 2. Thus, by forming the bulging portion 2f bulging outward on the inner peripheral wall 2d of the housing 2 corresponding to the non-attached portion of the guide member 11, the bulging portion 2f has the inner peripheral wall 2d of the housing 2 and the stator 32. A gap can be formed between the two. For this reason, the non-attached portion of the guide member 11 in the stator 32 does not come into contact with the inner peripheral wall 2d of the housing 2, and shavings of the housing 2 due to the contact may be generated also in the non-attached portion of the guide member 11. Absent.

  5 and 6 show the operation of press-fitting the stator 32 into the inner peripheral wall 2d of the housing 2. FIG.

  Prior to press-fitting, the guide member 11 is attached to the outer periphery of the stator 32 at three equal intervals. By attaching the guide member 11 to at least three places, the stator 32 can be press-fitted without tilting. The guide member 11 is attached by locking the locking holding portion 16 to the upper end portion of the stator 32. In this attached state, as shown in FIG. 5, the guide curved surface portion 15 of the guide member 11 extends from the insertion side end portion of the stator 32 toward the center side to cover the insertion side end portion.

  With the guide member 11 attached, the stator 32 is press-fitted into the inner peripheral wall 2 d of the housing 2. When press-fitting, since the tapered portion 17 formed on the guide curved surface portion 15 guides the press-fitting along the inner peripheral wall 2d of the housing 2, the press-fitting can be smoothly performed. Further, since the guide curved surface portion 15 prevents the corner portion of the stator 32 from directly contacting the inner peripheral wall 2d of the housing 2, it is possible to prevent generation of shaving powder from the housing 2. At the time of this press-fitting, the shift prevention unit 18 prevents the guide member 11 from shifting in the axial direction, so that the guide member 11 does not shift from the stator 32.

  Further, as shown in FIG. 5, a boss portion for increasing the strength of the guide curved surface portion 15 is formed on the outer peripheral surface side of the guide curved surface portion 15, and a portion protruding to the inner peripheral surface side of the guide curved surface portion 15 is formed. Has been. The protruding portion is engaged with the lower end portion of the stator 32 to form a displacement prevention portion 18a that prevents the guide member 11 from being displaced from the stator 32.

  FIG. 7 shows the press-fit completion state of the stator 32. A tapered step portion 2e is formed on the inner peripheral wall 2d of the housing 2, and the guide curved surface portion 15 of the guide member 11 contacts the step portion 2e. Due to this contact, the press-fitting of the stator 32 is stopped, and the stator 32 is fixed at a predetermined position on the inner peripheral wall 2 d of the housing 2. In this fixed state, the long fastening margin 14 of the guide member 11 is press-fitted into the inner peripheral wall 2d of the housing 2, so that a sufficient fastening margin can be secured and the stator 32 is stably fixed to the housing 2. be able to.

  In such an embodiment, the guide member 11 is attached to three locations on the outer periphery of the stator 32 and the stator 32 is press-fitted into the inner peripheral wall 2d of the housing 2, so that the corners of the stator 32 are the inner peripheral wall 2d of the housing 2. Therefore, it is possible to prevent generation of shavings that cause failure. Moreover, since it is possible to fix by press-fitting, a complicated shrink-fitting process can be eliminated.

  In this embodiment, the guide member 11 has a bowl shape in which a plurality of guide pieces 12 are connected by connecting pieces 13. However, the guide member 11 may be used alone as the guide member 11. May be in the shape of a curved plate curved along the outer periphery of the stator 32.

  FIG. 8 shows a modification in which the hook-shaped guide member 11 shown in FIG. 4 is attached to the outer periphery of the stator 32 at six locations. Six guide members 11 are attached to the outer periphery of the stator 32 at equal intervals. In this case, the stator 32 can be press-fitted in a state in which the inclination of the stator 32 with respect to the housing 2 is further reliably prevented.

  9 and 10 show modifications of the guide member 11, respectively.

  In the guide member 11 of FIG. 9, the guide curved surface portion 15 is folded back in an arc shape, and a shift prevention portion 18 is integrally formed at the folded end portion. The slip prevention part 18 extends in a planar shape from the folded end part of the guide curved surface part 15 toward the center of the stator 32. Since such a planar displacement prevention portion 18 contacts the insertion side end portion of the stator 32 with a large area, the displacement of the guide member 11 in the axial direction during press-fitting can be further reliably prevented. .

  Moreover, in the guide member 11 of FIG. 9, the latch holding | maintenance part 16 is not formed in the edge part on the opposite side to the guide curved surface part 15 in the allowance part 14. As shown in FIG. Even in this case, when the stator 32 is press-fitted into the inner peripheral wall 2d of the housing 2, the guide member 11 can reliably guide the stator 32.

  In the guide member 11 of FIG. 10, the shift preventing portion 18 is connected to the end portion of the guide curved surface portion 15 in an oblique manner. The shift preventing portion 18 prevents the shift of the guide member 11 in the axial direction when the stator 32 is press-fitted when the corner portion abuts against the insertion side end (lower end) of the stator 32. As a result of the action, the deviation preventing portion 18 can be expanded and deformed toward the center side of the stator 32. Thereby, the shift | offset | difference of the guide member 11 can be prevented reliably.

  As shown in FIG. 10, a boss portion for increasing the strength of the guide curved surface portion 15 is formed on the outer peripheral surface side of the guide curved surface portion 15, and a portion protruding to the inner peripheral surface side of the guide curved surface portion 15 is formed. Has been. The protruding portion is engaged with the lower end portion of the stator 32 to form a displacement prevention portion 18a that prevents the guide member 11 from being displaced from the stator 32.

  In the guide member 11 of FIG. 10 as well, the latch holding portion 16 is not formed at the end portion of the tightening margin portion 14 opposite to the guide curved surface portion 15. The guide member 11 can reliably perform the guide when the inner peripheral wall 2d is press-fitted.

  Moreover, although the example which provided the guide member 11 in 3 places and 6 places of the outer periphery of the stator 32 was shown in the said embodiment, the guide member 11 may be formed over the perimeter of the stator 32. FIG. .

DESCRIPTION OF SYMBOLS 1 Electric compressor 2 Housing 2d Inner peripheral wall 2f Swelling part 3 Electric motor part 4 Compressor 11 Guide member 14 Tightening margin part 15 Guide curved surface part 16 Locking holding part 17 Taper part 18 Deviation prevention part 32 Stator 33 Rotor

Claims (7)

A cylindrical housing (2), an electric motor part (3) fixed in the housing (2), and a drive force provided by the electric motor part (3) disposed in the housing (2). A compressor (1) for compressing refrigerant, and the electric motor section (3) is an electric compressor (1) formed by a stator (32) and a rotor (33) ,
The stator (32) is fixed to the inner peripheral wall (2d) of the housing (2) in the housing (2), and the stator (32) generates a magnetic force when energized. Configured,
The rotor (33) is rotatably arranged inside the stator (32), and is configured to rotate by the magnetic force generated by the stator (32).
A guide member (11) made of a thin plate material is provided on the outer periphery of the stator (32), and the stator (32) is interposed between the housing (2) and the guide member (11). And is fixed to the inner peripheral wall (2d) of the housing (2),
The electric compressor (1), wherein the guide member (11) includes a guide curved surface portion (15) for guiding insertion of the stator (32) into the housing (2 ). . An electric compressor (1) according to claim 1,
The electric compressor characterized in that the guide curved surface portion (15) is a curved surface directed from the insertion side end portion of the stator (32) to the inside of the housing (2) toward the center side of the stator (32). (1). The electric compressor (1) according to claim 1 or 2,
The guide member (11) includes a slip prevention portion (18) for preventing the guide member (11) from slipping in the axial direction when the stator (32) is inserted into the housing (2). However, the electric compressor (1) is provided so as to extend from the guide curved surface portion (15 ). The electric compressor (1) according to any one of claims 1 to 3,
The guide member (11) is composed of a tightening margin portion (14), the guide curved surface portion (15), and a latch holding portion (16).
The fastening margin (14) is formed in a long shape along the axial direction of the stator (32), and the fastening margin (14) is formed in the housing (2) within the housing. It is fixed to the inner peripheral wall (2d) of (2),
The guide curved surface portion (15) extends from an insertion side end portion of the fastening margin portion (14),
The locking holding portion (16) is provided at the end of the tightening margin (14) opposite to the guide curved surface portion (15) in order to attach the guide member (11) to the stator (32). The electric compressor (1) characterized by the above-mentioned. An electric compressor (1) according to any one of claims 1 to 4,
The electric compressor (1), wherein the guide members (11) are attached at equal intervals along a circumferential direction of the stator (32). The electric compressor (1) according to any one of claims 1 to 5,
The inner peripheral wall (2d) of the housing (2) facing the non-attached outer periphery of the stator (32) not provided with the guide member (11) bulges toward the outer peripheral side of the housing (2) and is fixed. An electric compressor (1), wherein a gap is formed between the non-attached outer periphery of the child (2). A cylindrical housing (2), an electric motor part (3) fixed in the housing (2) , and a rotational driving force of the electric motor part (3) disposed in the housing (2) are activated. A compressor (4) for compressing the refrigerant, and the electric motor portion (3) is fixed to the housing (2) by press-fitting into the inner peripheral wall (2d) of the housing (2) and generates a magnetic force by energization. And an electric compressor (rotor (33), which is rotatably arranged inside the stator (32) and is rotated by the magnetic force generated by the stator (32)). 1) assembly method,
When the stator (32) is press-fitted into the inner peripheral wall (2d) of the housing (2), guide members (11) made of a thin plate material are provided at at least three locations on the outer periphery of the stator (32), and the guide A method of assembling the electric compressor (1), wherein the guide curved surface of the member (11) guides the press-fitting of the stator (32) into the inner peripheral wall (2d) of the housing (2).

Images