JP2005291004A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor, of such structure that housings for a compressor main body are fixed to each other by bolts, in which the compressor main body is not diametrically large-sized, and in which gas tightness between the adjoining housings can be sufficiently secured by simple structure. <P>SOLUTION: In this electric compressor, a plurality of bolts 14 disposed on the circumferential edge side of the housings 11, 12, and 13 are inserted from one axial end surface of the third housing 13 through the third housing 13 and the second housing 12 to be engaged with the first housing 11, so that the housings 11, 12, and 13 are fixed to each other. Need of providing flange parts for fastening bolts on the outer circumferential surface side of the housings 11, 12, and 13 is thus eliminated. In this case, since distance between a seat surface of the bolt 14 and an engagement part can be long, fastening force of each bolt 14 can be dispersed in the circumferential direction of the housings 11, 12, and 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric compressor used for refrigerant compression of a vehicle air conditioner or the like.

  Conventionally, this type of electric compressor includes a hollow cylindrical compressor body that sucks and discharges refrigerant, a so-called scroll-type compression section that compresses the refrigerant sucked into the compressor body, and a compression section. There is known a motor including a driving motor, the compressor body is formed by a plurality of housings arranged in the axial direction, and the housings are fixed to each other by bolts (see, for example, Patent Document 1). ).

Moreover, in the said electric compressor, the flange part which protrudes to a radial direction outer side is provided in the outer peripheral surface side of each housing, and each housing is fixed by fastening each flange part with a volt | bolt.
Japanese Patent Laid-Open No. 5-113188

  However, in the electric compressor, each housing is provided with a flange portion for fastening bolts projecting radially outward, so that the compressor main body is increased in size in the radial direction, for example, the limitation of the installation space in the engine room of the vehicle. There was a problem that it was easy to receive. Moreover, in the structure which fastens the flange part of each housing with a volt | bolt, since fastening force concentrates on the fastening part of a volt | bolt, the end surfaces of each housing cannot be made to contact | abut with uniform surface pressure. For this reason, there is a problem that a complicated sealing structure such as fitting a sealing member such as an O-ring into a groove provided on the end face of each housing is required, resulting in an increase in manufacturing cost.

  The present invention has been made in view of the above problems, and the purpose of the present invention is to increase the size of the compressor body in the radial direction even in a structure in which the housings of the compressor body are fixed with bolts. It is another object of the present invention to provide an electric compressor capable of sufficiently ensuring the airtightness between the housings with a simple structure.

  In order to achieve the above object, the present invention comprises a compressor main body formed in a hollow shape, a compressor for compressing fluid sucked into the compressor main body, and a motor for driving the compressor. An electric compressor in which a main body is formed by a plurality of housings arranged in an axial direction, and the housings are fixed to each other by bolts. The housings are fixed to each other by being inserted into the housing from one end face thereof and screwed into the housing on the other axial end side.

  Thereby, each housing is fixed by the bolt which penetrates the inside of a housing from the axial direction one end surface of a housing, Therefore It is not necessary to project the flange part for bolt fastening on the outer peripheral surface side of each housing. In this case, one end side of the bolt is located on one end side in the axial direction of the housing, and the other end side is screwed into the housing on the other end side in the axial direction. The fastening force of the bolt is dispersed in the circumferential direction of each housing.

  According to the electric compressor of the present invention, since it is not necessary to project a bolt fastening flange portion on the outer peripheral surface side of each housing, the compressor main body can be reduced in the radial direction, and the mounting space is small. This is advantageous when installed in an engine room or the like. Moreover, since the fastening force of each bolt can be distributed in the circumferential direction of each housing, the surface pressure between the end surfaces of each housing can be made uniform. Therefore, for example, a simple sealing structure using a flat gasket can sufficiently secure the airtightness between the housings, and the manufacturing cost can be reduced.

  1 to 4 show an embodiment of the present invention. FIG. 1 is a side sectional view of an electric compressor, FIG. 2 is a front view thereof, FIG. 3 is an exploded side view of a housing, and FIG. It is AA arrow direction sectional drawing.

  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.

  The compressor body 10 includes cylindrical first, second, and third housings 11, 12, and 13 that are axially divided from each other. The housings 11, 12, and 13 are fixed to each other by a plurality of bolts 14. Yes. In this case, the bolts 14 are arranged on the peripheral sides of the housings 11, 12, 13 at intervals in the circumferential direction of the housings 11, 12, 13.

  One end of the first housing 11 is connected to one end of the second housing 12, and a refrigerant suction port 11a is provided on the peripheral surface thereof. Further, a screw hole 11 b into which the bolt 14 is screwed is provided on one end surface of the first housing 11. The inside of the first housing 11 is partitioned into one end side and the other end side by a partition wall 11c, and an accommodation portion 11d for accommodating the inverter device 40 is formed at the other end side. One end of the accommodating portion 11 d is closed by a closing plate 15, and the closing plate 15 is fixed to the first housing 11 by a bolt 16. A bearing 11e that supports one end of the motor 30 is provided at the center of the partition wall 11c.

  The second housing 12 has one end connected to one end of the first housing 11 and the other end connected to the third housing 13. A bearing 12 a that supports the other end of the motor 30 is provided inside the second housing 12, and a through hole 12 b through which the bolt 14 is inserted is provided on the other end surface of the second housing 12.

  The third housing 13 has a refrigerant discharge port 13 a on one end surface, and the other end is connected to the other end of the second housing 12. Further, a through hole 13b through which the bolt 14 is inserted is provided on one end surface of the third housing 13.

  The compression unit 20 includes a fixed scroll member 21 disposed on the other end side in the third 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. It is fixed to the third housing 13 by 23. A spiral body 21 a is provided at one end surface of the fixed scroll member 21, and a through hole 21 b communicating with the discharge port 13 a of the third housing 13 is provided at substantially the 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. Further, a rotation prevention mechanism 24 is provided between the movable scroll member 22 and the second housing 12, and the rotation prevention mechanism 24 performs a predetermined turning motion in which the movable scroll member 22 is prevented from rotating. ing.

  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. The stator 34 is fixed to the second housing 12 by shrink fitting. The windings 33 are arranged in the circumferential direction of the stator 34, and the rotor 32 is disposed inside the stator 34. One end of the rotating shaft 31 is rotatably supported by the bearing 11e of the first housing 11 via the roller bearing 31a, and the other end is rotatably supported by the bearing 12a of the second housing 12 via the ball bearing 31b. It is supported. 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. The stator 34 has a total of nine slots 34 a arranged in the circumferential direction, and the number of slots 34 a is the same as the number of poles of the stator 34. Further, a total of six notches 34b extending in the axial direction are provided on the outer peripheral surface of the stator 34, and the bolts 14 are arranged in the notches 34b. In this case, each notch 34b is arranged at the center in the circumferential direction of a total of six slots 34a, and is formed so as to have a gap with the outer peripheral surface of the bolt 14, respectively.

  The inverter device 40 is formed of a known circuit that variably controls the rotation speed of the motor 30 and is mounted in the housing portion 11d of the first housing 11 so as to be in close contact with the partition wall 11c. The inverter device 40 is connected to each winding 33 of the motor 30 via a plurality of terminals 41 penetrating the partition wall 11c of the first housing 11, and each terminal 41 is a hole in the partition wall 11c. It is attached to the attachment plate 42 fixed to the. Further, the inverter device 40 is connected to an external power source via the connector 43.

  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 first housing 11 from the suction port 11a of the compressor body 10 circulates in the gap of the motor 30 (such as between the stator 34 and the rotor 32), and the spiral body 22a of the movable scroll member 22 It is sucked between the spiral body 21 a of the fixed scroll member 21, compressed between the spiral bodies 21 a and 22 a, and discharged from the discharge port 13 a 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.

  The compressor main body 10 of the electric compressor is formed by fastening the housings 11, 12, and 13 with bolts 14 as shown in FIG. That is, the bolt 14 is inserted through the third housing 13 through the through hole 13b of the third housing 13, and is inserted through the second housing 12 through the through hole 12b of the second housing 12. The screw 11 is screwed into the screw hole 11b of the housing 11. At that time, the bolt 14 is disposed on the outer peripheral surface side of the stator 34 by being inserted through the notch 34 b of the stator 34 in the second housing 12. Further, flat gaskets 17 and 18 are interposed between the first housing 11 and the second housing 12 and between the second housing 12 and the third housing 13, respectively.

  As described above, according to the electric compressor of the present embodiment, the plurality of bolts 14 arranged on the peripheral sides of the respective housings 11, 12, 13 are connected to the third housing 13 and the third housing 13 from the one end surface in the axial direction of the third housing 13. The housings 11, 12, 13 are fixed to each other by being inserted into the second housing 12 and screwed into the first housing 11. There is no need to project a bolt fastening flange, and the compressor body 10 can be reduced in size in the radial direction. In this case, one end side of each bolt is positioned at one end side in the axial direction of the third housing 13 and the other end side is screwed into the first housing 11 at the other end side in the axial direction. The distance to the mating portion can be increased, and the fastening force of each bolt 14 can be dispersed in the circumferential direction of each housing 11, 12, 13. As a result, the surface pressure between the end faces of the housings 11, 12, 13 can be made uniform, so that the airtightness between the housings 11, 12, 13 is achieved by a simple sealing structure using the flat gaskets 17, 18. Therefore, the manufacturing cost can be reduced.

  In addition, since each bolt 14 is inserted through a plurality of notches 34 b provided on the outer peripheral surface of the stator 34 of the motor 30, the stator 34 in the second housing 12 does not interfere with each bolt 14. Can be arranged. Even when the stator 34 is loosened in the circumferential direction with respect to the second housing 12 at a high temperature or a high load, the engagement of the notch 34b of the stator 34 and each bolt 14 causes the circumferential direction of the stator 34 to be increased. Misalignment can be reliably prevented.

  Further, since the notch 34b of the stator 34 is formed so as to have a gap between the outer peripheral surface of the bolt 14, the refrigerant in the compressor body 10 is allowed to flow between the notch 34b of the stator 34 and the bolt 14. The pressure loss of the refrigerant flowing from the suction side to the discharge side can be reduced.

  Further, since the number of notches 34b through which the bolts 14 are inserted is equal to or less than the number of poles of the stator 34, the number of notches 34b can be reduced to one or less with respect to one slot 34a. There is an advantage that the notch 34b is formed over 34a or the number of the notches 34b is increased and the output of the motor 30 is not lowered.

  In the above-described embodiment, the stator 34 is fixed to the second housing 12 by shrink fitting. However, as shown in FIGS. 5 and 6, the stator 34 is attached to the outer peripheral surface of the stator 34. Notch portions 34 c of a plurality of bolts 17 to be fixed to the housing 12 may be provided, and the stator 34 may be fixed to the second housing 12 by each bolt 17. In this case, the total of the number of notches 34b for the bolts 14 that fix the housings 11, 12, and 13 and the number of notches 34c for the bolts 17 that fix the stator 34 to the second housing 12 is included. By setting the number to be equal to or less than the number of poles of the stator 34, the notches 34b and 34c are formed over the adjacent slots 34a or the number of the notches 34b and 34c is increased as described above. There is an advantage that the output of the motor 30 does not decrease. 5 and 6, the total number of the notches 34b and 34c for the bolts 14 and 17 is the same as the number of poles of the stator 34, but the number is smaller than the number of poles of the stator 34. May be.

Side surface sectional drawing of the electric compressor which shows one Embodiment of this invention Front view of electric compressor Disassembled side view of housing AA arrow direction sectional view of FIG. Side surface sectional drawing of the electric compressor which shows other embodiment of this invention. BB sectional view taken along line BB in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Compressor main body, 11 ... 1st housing, 12 ... 2nd housing, 13 ... 3rd housing, 14 ... Bolt, 20 ... Compression part, 30 ... Motor, 34b, 34c ... Notch part.

Claims (5)

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 a plurality of compressor bodies that are arranged in the axial direction with respect to each other. In an electric compressor formed by housings and fixed to each other by bolts,
A plurality of bolts arranged on the peripheral edge side of the housing are inserted into the housing from one end surface of the housing on one axial end side and screwed into the housing on the other axial end side to fix each housing. A featured electric compressor. 2. The electric compressor according to claim 1, wherein a plurality of notch portions through which the respective bolts are inserted are provided on an outer peripheral surface of a motor disposed in the housing. The electric compressor according to claim 2, wherein the notch is formed so as to have a gap between the outer peripheral surface of the bolt. 4. The electric compressor according to claim 1, wherein the number of the cutout portions is equal to or less than the number of poles of the stator of the motor. While providing a notch portion of the bolt for fixing the stator to the housing on the outer peripheral surface of the motor,
The total number of bolt notches for fixing the housings to each other and the number of bolt notches for fixing the stator to the housing is the number equal to or less than the number of poles of the stator of the motor. The electric compressor according to claim 1, 2, 3, or 4.

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