JP4045125B2 - Electric compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric compressor used for refrigerant compression of a vehicle air conditioner or the like.
[0002]
[Prior art]
Conventionally, as this type of electric compressor, for example, as described in JP-A-9-287585, a hollow cylindrical compressor body for sucking and discharging a refrigerant, and a compressor body that has been sucked into the compressor body 2. Description of the Related Art A so-called scroll type compression unit that compresses a refrigerant and a motor that drives the compression unit are provided, and the motor is disposed at a predetermined position in the compressor body.
[0003]
By the way, in the electric compressor, the inner diameter of the housing of the compressor main body in which the motor is disposed is formed slightly smaller than the outer diameter of the motor, and the housing is thermally expanded at a high temperature to thereby expand the inner diameter of the housing. After the motor is housed, the motor is fixed to the compressor body by so-called shrink fitting, in which the motor is fastened and fixed by the housing when the housing reaches room temperature.
[0004]
[Problems to be solved by the invention]
However, in the fixing method by shrink fitting, when the temperature of the housing rises due to the heat of the motor or the heat of the high-temperature refrigerant during the operation of the compressor, the housing is formed of a material having a higher coefficient of thermal expansion than the motor ( For example, when the housing is made of an aluminum-based material and the main part of the motor is iron, there is a problem that the tightening force of the housing with respect to the motor is reduced, and the motor is displaced due to vibrations of the compressor.
[0005]
The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric compressor capable of reliably preventing displacement of a motor even when used under high temperature conditions. It is to provide.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in claim 1, a compressor main body formed in a hollow shape, a compression section that compresses fluid sucked into the compressor main body, a motor that drives the compression section, and the provided, in the electric compressor disposed motor in a predetermined position within the compressor body, it is fixed to the compressor body through a fixing member made of the motor from a high coefficient of thermal expansion material than the compressor body and motor An engaging portion that engages with at least one of the motor and the compressor main body is provided at a predetermined position in the circumferential direction of the fixing member .
[0007]
As a result, when the temperature of the compressor body rises, the compressor body, the motor, and the fixing member each cause thermal expansion, but even if the coefficient of thermal expansion of the compressor body is larger than that of the motor, Since the thermal expansion coefficient of the fixing member interposed therebetween is larger than that of the compressor body, the holding force of the motor by the fixing member does not decrease. In this case, when the engaging portion restricts the rotation of the fixing member in the circumferential direction with respect to the motor or the compressor main body, and the engaging portion that engages both the motor and the compressor main body is provided, the motor passes through the fixing member. And is positioned circumferentially with the compressor body.
[0008]
Further, in claim 2, in the electric compressor according to claim 1, is fixed in the axial direction by a predetermined portion of the compressor body of the motor, the predetermined portion of the compressor body and the axis Direction one end side of the motor The fixing member is interposed between the other axial end of the motor and the predetermined portion of the compressor main body, or between the both axial end ends of the motor and the predetermined portion of the compressor main body . .
[0009]
Thereby, in addition to the operation of the first aspect, since the motor is fixed from the axial direction of the compressor body, the stress due to the thermal expansion of the fixing member is generated in the axial direction of the compressor body.
[0010]
According to a third aspect of the present invention, in the electric compressor according to the first or second aspect, the fixing member is formed in an annular shape.
[0011]
Thereby, in addition to the effect | action of Claim 1 or 2, since the fixing member is formed cyclically | annularly, the thermal expansion of a fixing member generate | occur | produces uniformly in the circumferential direction.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a first embodiment of the present invention. FIG. 1 is a side sectional view of an electric compressor, and FIG. 2 is a front view of a fixing member.
[0013]
The electric compressor includes a compressor main body 10 that sucks and discharges refrigerant, a compressor 20 that compresses refrigerant sucked into the compressor main body 10, a motor 30 that drives the compressor 20, and a motor 30 that drives the motor 30. The inverter device 40 is provided.
[0014]
The compressor body 10 is formed in a cylindrical shape and includes a suction side housing 11, an intermediate housing 12, and a discharge side housing 13. The suction side housing 11 is connected to one end of the intermediate housing 12 by a bolt 14, and a refrigerant suction port 11a is provided on a side surface thereof. The inside of the suction side housing 11 is partitioned into one end side and the other end side by a partition wall 11b, and a housing portion 11c for housing the inverter device 40 is formed at one end side thereof. One end of the accommodating portion 11 c is closed by a closing plate 15, and the closing plate 15 is fixed to the suction side housing 11 by a bolt 16. A bearing 11d that supports one end of the motor 30 is provided at the center of the partition wall 11b. The intermediate housing 12 is connected to one end of the discharge side housing 13 by a bolt 17, and a bearing 12 a that supports the other end side of the motor 30 is provided therein. The discharge-side housing 13 communicates with the suction-side housing 11 through the intermediate housing 12, and a refrigerant discharge port 13a is provided on the other end surface.
[0015]
The compression unit 20 includes a fixed scroll member 21 disposed on the other end side in the discharge side housing 13 and a movable scroll member 22 disposed on one end side of the fixed scroll member 21, and the fixed scroll member 21 is a bolt 23. Is fixed to the discharge-side housing 13. A spiral body 21 a is provided on one end surface of the fixed scroll member 21, and a through hole 21 b communicating with the discharge port 13 a of the discharge side housing 13 is provided in the approximate center of the fixed scroll member 21. A spiral body 22a is provided on one end surface of the movable scroll member 22, and a boss portion 22b extending on the motor 30 side is provided on the other end surface. In addition, a rotation prevention mechanism 24 is provided between the movable scroll member 22 and the intermediate housing 12, and the rotation prevention mechanism 24 performs a predetermined turning motion in which the movable scroll member 22 is prevented from rotating. .
[0016]
The motor 30 is a well-known three-phase AC brushless motor, and is disposed in the compressor body 10. The motor 30 includes a rotating shaft 31 extending in the cylinder axis direction of the compressor body 10, a rotor 32 made of a permanent magnet attached to the rotating shaft 31, windings 33 arranged around the rotor 32, and each winding 33. It is comprised from the cylindrical stator 34 which hold | maintains. The windings 33 are arranged in the circumferential direction of the stator 34, and the rotor 32 is disposed inside the stator 34.
[0017]
One end of the rotating shaft 31 is rotatably supported by a bearing 11d of the suction side housing 11 via a roller bearing 31a, and the other end is rotatably supported by a bearing 12a of the intermediate housing 12 via a ball bearing 31b. Yes. An eccentric pin 31 c that is eccentric with respect to the rotation shaft 31 protrudes from the other end surface of the rotation shaft 31, and the eccentric pin 31 c is inserted into the eccentric bush 35. The eccentric bush 35 is rotatably supported by the boss portion 22b of the movable scroll member 22 via a roller bearing 35a.
[0018]
The motor 30 is disposed in the intermediate housing 12 of the compressor body 10 and is fixed to the intermediate housing 12 via a total of two fixing members 50 formed in an annular shape. Each fixing member 50 is disposed on one end side and the other end side in the axial direction of the motor 30, and the fixing member 50 on one end side is interposed between the end surface of the suction side housing 11 and the peripheral edge of the stator 34, and on the other end side. The fixing member 50 is interposed between the stepped portion 12 b provided on the inner peripheral surface of the intermediate housing 12 and the peripheral edge of the stator 34. That is, when the suction side housing 11 and the intermediate housing 12 are fastened by the bolts 14, the motor 30 is sandwiched and fixed in the axial direction by the housings 11 and 12 via the fixing members 50. In this case, each fixing member 50 is made of a material having a higher coefficient of thermal expansion than the intermediate housing 12 and the motor 30. For example, when the intermediate housing 12 is made of an aluminum material and the main part of the motor 30 is made of iron, each fixing member 50 is made of magnesium, polymer, or the like.
[0019]
The inverter device 40 is formed of a known circuit that variably controls the rotation speed of the motor 30, and is attached in the housing portion 11 c of the suction side housing 11 so as to be in close contact with the partition wall 11 b. The inverter device 40 is connected to each winding 33 of the motor 30 via a plurality of terminals 41 penetrating the partition wall 11b of the suction side housing 11, and each terminal 41 is connected to a hole of the partition wall 11b. It is attached to a fixed attachment plate 42. Further, the inverter device 40 is connected to an external power source via the connector 43.
[0020]
In the electric compressor configured as described above, when the motor 30 rotates, the movable scroll member 22 of the compression unit 20 performs a predetermined turning motion by the rotation of the eccentric bush 35. As a result, the refrigerant that has flowed into the suction-side housing 11 from the suction port 11a of the compressor body 10 circulates through the gap of the motor 30 (such as between the stator 34 and the rotor 32), and is fixed to the spiral body 22a of the movable scroll member 22. The air is sucked between the scroll member 21 and the spiral body 21a, compressed between the spiral bodies 21a and 22a, and discharged from the discharge port 13a of the compressor body 10. In addition, about the compression operation | movement of each spiral body 21a, 22a in the scroll compressor of this embodiment, since it is the same as that of a known structure, detailed description is abbreviate | omitted.
[0021]
Further, when the temperature of the intermediate housing 12 rises due to the heat generated by the motor 30, the heat of the high-temperature refrigerant, or the heat in the engine room during the operation of the compressor, the intermediate housing 12, the motor 30, and each fixing member 50 are thermally expanded. However, even when the thermal expansion coefficient of the intermediate housing 12 is larger than that of the motor 30, the fixing member 50 has a larger coefficient of thermal expansion than the intermediate housing 12 and the motor 30, so Will not drop.
[0022]
As described above, according to the electric compressor of the present embodiment, the motor 30 is fixed to the compressor main body 10 via the fixing member 50 made of a material having a higher thermal expansion coefficient than the intermediate housing 12 and the motor 30. Therefore, even when the thermal expansion coefficient of the intermediate housing 12 is larger than that of the motor 30, the holding force of the motor 30 by each fixing member 50 does not decrease, and even when the intermediate housing 12 is used under high temperature conditions, the compressor body The positional deviation of the motor 30 in the motor 10 can be reliably prevented. Further, since the process of heating the housing to a high temperature is not required unlike the conventional fixing method by shrink fitting, the assembling work can be easily performed and the productivity can be improved.
[0023]
In this case, since the motor 30 is fixed between the end surface of the suction side housing 11 and the stepped portion 12b of the intermediate housing 12 through the fixing members 50 from the axial direction, the stress due to the thermal expansion of each fixing member 50 Can be generated in the axial direction of the compressor body 10, which is advantageous in terms of the strength of the compressor body 10.
[0024]
Further, since each fixing member 50 is formed in an annular shape, thermal expansion can be uniformly generated in the circumferential direction of the fixing member 50, and the motor 30 can be reliably fixed to the compressor body 10.
[0025]
In the above embodiment, the motor 30 is fixed from the axial direction of the compressor body 10. However, the fixing member is interposed between the inner peripheral surface of the intermediate housing 12 and the outer peripheral surface of the motor 30. By doing so, the motor 30 may be fixed from the radial direction of the compressor body 10.
[0026]
3 to 5 show a second embodiment of the present invention. FIG. 3 is a side sectional view of an essential part of the electric compressor. FIG. 4 is a front view of a fixing member in the direction of arrows AA in FIG. 5 is a front view of the motor in the direction of arrows BB in FIG. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to the said embodiment.
[0027]
In the present embodiment, a fixing member 50 equivalent to that of the above-described embodiment is interposed between the other end side of the motor 30 and the stepped portion 12 b of the intermediate housing 12, and one end side of the motor 30 and the end face of the suction side housing 11. An annular fixing member 51 having another shape is interposed between the two.
[0028]
The fixing member 51 has a stepped portion 51 a that receives the peripheral portion of the stator 34 on one end surface thereof, and a protrusion 51 b that engages with the motor 30 side is provided at one place in the circumferential direction. The end surface is provided with a recess 34 a that engages the protrusion 51 b of the fixing member 51.
[0029]
That is, according to the present embodiment, by engaging the protrusion 51b of the fixing member 51 with the recess 34a on the motor 30 side, the rotation of the fixing member 51 in the circumferential direction can be restricted. The motor 30 can be securely assembled.
[0030]
6 and 7 show a third embodiment of the present invention. FIG. 6 is a side sectional view of an essential part of the electric compressor, and FIG. 7 is a front view of a fixing member in the direction of arrows CC in FIG. FIG. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to the said embodiment.
[0031]
In the present embodiment, an annular fixing member 53 having a shape different from that of the embodiment is interposed only between one end side of the motor 30 and the end surface of the suction side housing 11.
[0032]
As in the second embodiment, the fixing member 52 has a stepped portion 52a that receives the peripheral portion of the stator 34 on one end surface, and a protrusion that engages with the concave portion 34a of the motor 30 at one circumferential position. A part 52b is provided. In addition, a recess 52c that engages with the suction-side housing 11 is provided at one circumferential position on the other end surface of the fixing member 52, and a protrusion 11e that engages the recess 52c of the fixing member 52 on the end surface of the suction-side housing 11. Is provided.
[0033]
That is, according to the present embodiment, by engaging the protrusion 52b of the fixing member 52 with the recess 34a on the motor 30 side, the rotation of the fixing member 52 in the circumferential direction is restricted as in the second embodiment. The fixing member 52 can be reliably assembled to the motor 30, and the protrusion 11 e of the suction side housing 11 is engaged with the recess 52 c of the fixing member 52, so that the fixing member 51 in the circumferential direction of the suction side housing 11 is engaged. Rotation can be regulated. Thereby, the motor 30 can be positioned in the circumferential direction with the suction-side housing 11 via the fixing member 52, and the motor 30 can be always assembled in a predetermined direction.
[0034]
In the third embodiment, the projection 52b and the recess 34a for engaging the fixing member 52 and the motor 30 are shown. However, the recess 52c for engaging the fixing member 52 and the suction side housing 11 is shown. And only the protrusion 11e may be provided.
[0035]
【The invention's effect】
As described above, according to the electric compressor of the first aspect, even when the coefficient of thermal expansion of the compressor body is larger than that of the motor, the holding force of the motor by the fixing member does not decrease. Even if it is used, it is possible to reliably prevent displacement of the motor in the compressor body. Further, since a process of heating the compressor body to a high temperature is not required unlike the conventional fixing method by shrink fitting, assembly work can be easily performed, and productivity can be improved. Furthermore, since the rotation of the fixing member in the circumferential direction relative to the motor or the compressor main body can be restricted by the engaging portion, the fixing member can be reliably assembled to the motor or the compressor main body. In addition, when the engaging portion that engages both the motor and the compressor main body is provided, the motor can be positioned circumferentially with the compressor main body via the fixing member, so that the motor is always in a predetermined direction. Can be assembled to the compressor body.
[0036]
In addition, according to the electric compressor of claim 2, in addition to the effect of claim 1, stress due to thermal expansion of the fixing member can be generated in the axial direction of the compressor body. Is also advantageous.
[0037]
According to the electric compressor of the third aspect, in addition to the effect of the first or second aspect, the thermal expansion can be uniformly generated in the circumferential direction of the fixing member, so that the motor is securely fixed to the compressor body. can do.
[Brief description of the drawings]
FIG. 1 is a side sectional view of an electric compressor showing a first embodiment of the present invention. FIG. 2 is a front view of a fixing member. FIG. 3 is a main portion of an electric compressor showing a second embodiment of the invention. FIG. 4 is a side sectional view of the fixing member in the direction of arrows AA in FIG. 3. FIG. 5 is a front view of the motor in the direction of arrows BB in FIG. Side surface sectional drawing of the principal part of the electric compressor which shows Embodiment 3 [FIG. 7] The front view of the fixing member in the CC arrow direction of FIG.
DESCRIPTION OF SYMBOLS 10 ... Compressor main body, 11e ... Projection part, 20 ... Compression part, 30 ... Motor, 34a ... Recessed part, 50, 51 ... Fixing member, 51b ... Projection part, 52 ... Fixation member, 51b ... Projection part.

Claims (3)

An electric motor comprising a compressor body formed in a hollow shape, a compression section that compresses fluid sucked into the compressor body, and a motor that drives the compression section, and the motor is disposed at a predetermined position in the compressor body. In the compressor,
While fixing the motor to the compressor main body through a fixing member made of a material having a higher coefficient of thermal expansion than the compressor main body and the motor ,
An electric compressor characterized in that an engaging portion that engages with at least one of a motor and a compressor main body is provided at a predetermined circumferential position of the fixing member . While fixing the motor from the axial direction by a predetermined portion of the compressor body,
Between the axis Direction one end side of the motor between the predetermined portion of the compressor body, and the other axial end of the motor and the predetermined portion of the compressor body or the axial direction end side of the compressor body of the motor, The electric compressor according to claim 1, wherein the fixing member is interposed between the predetermined portion of the electric compressor. The electric compressor according to claim 1, wherein the fixing member is formed in an annular shape.

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