JP2013245621A - Electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve economical advantages/productivity of an electric compressor, to make the electric compressor small-sized and to reduce noise.SOLUTION: Inside a body casing 410, there are provided: an electric motor 5 comprised of a stator 5a and a rotor 5b; and a compression mechanism section 4 driven by the electric motor 5. In the body casing 410, a partition wall section 450 including an accommodation support part 450a of a main bearing 42 is formed integrally by axially dividing the inside of the body casing 410 in a communicating space portion between the compression mechanism section 4 and the electric motor 5. Therefore, high-accuracy machining finish of an inner peripheral surface of the body casing, an outer peripheral surface of a main bearing member or the like and component assembly, such as fitting or press-fitting, requiring high assembly accuracy are not required and furthermore, thickness is not required for a fitting part which is set for fitting or press-fitting. Thus, there can be provided an electric compressor which is excellent in economical advantages/productivity, is small-sized and reduces noise.

Description

  The present invention relates to an electric compressor.

  Conventionally, an electric compressor is configured to compress a refrigerant by driving a compression unit such as a scroll type by an electric motor or the like, and the compression unit and the electric motor are housed in a cylindrical casing. (For example, see Patent Document 1).

  Hereinafter, an in-vehicle electric compressor which is one of such conventional electric compressors will be described with reference to the drawings.

  FIG. 2 is an axial cross-sectional view showing the configuration of the conventional electric compressor shown in Patent Document 1. As shown in FIG.

  As shown in FIG. 2, the electric compressor 1 incorporates an electric motor 5 in the main body casing 3, and drives a compression mechanism portion 4 that is fitted or press-fitted into the main body casing 3. The electric motor 5 is driven by an inverter device 101 incorporated in the inverter case 102.

  Further, a main bearing 42 for supporting the pump 13, the auxiliary bearing 41, the electric motor 5, and the driving shaft 14 from the electric motor 5 is provided in the main body casing 3 from one end wall 3 a side in the axial direction (right side in the figure). A main bearing member 51 is disposed.

  The electric motor 5 is configured such that the stator 5a is shrink-fitted and fixed to the main body casing 3, or is fixed by the annular member 17, and the drive shaft 14 can be rotationally driven by the rotor 5b fixed around the middle of the drive shaft 14. .

  The main bearing member 51 is fixed to the fixed spiral part 11 by a bolt (not shown) and the like, fitted into the opening end on the left side of the main body casing 3 in the drawing, and clamped by the inverter case 102 which is bolted to the opening end of the main body casing 3 Thus, it is fixed in the main casing 3. And the main bearing 42 which supports the compression mechanism part 4 side of the said drive shaft 14 is incorporated in the anti-fixed spiral part 11 side surface of the said main bearing member 51. As shown in FIG.

  Further, a scroll compressor is configured by sandwiching the swirl spiral portion 12 between the main bearing member 51 and the fixed spiral portion 11. Further, a rotation restraining portion for preventing the rotation of the swirl spiral portion 12 such as an Oldham ring 57 and making a circular motion is provided between the main bearing member 51 and the swirl spiral portion 12, and the drive shaft 14 is arranged as an eccentric bearing. The swirl spiral part 12 is connected to the swirl spiral part 12 through 43 so that the swirl spiral part 12 can be swung on a circular orbit.

  The compression mechanism section 4 is provided with a discharge hole 31 and a reed valve 31a, and is opened to a discharge chamber 62 composed of a fixed end plate 11a and a lid 65. The discharge chamber 62 is an electric motor having a discharge port 9 between the compression mechanism portion 4 and the end wall 3a through the fixed spiral portion 11 and the main bearing member 51 or a communication passage 63 formed between them and the main body casing 3. It is configured to communicate with the 5 side.

JP 2009-97503 A

  However, in the above-described conventional electric compressor, the gas compression force (compression reaction force) due to the compression motion of the fixed vortex portion 11 and the swirl spiral portion 12 and the centrifugal force due to the eccentric center of gravity of the swirl spiral portion 12 cause the eccentric bearing 43 to move. At the same time, the centrifugal force generated in the rotor 5b of the electric motor 5 directly acts on the drive shaft 14 and is supported by the main bearing 42 and the auxiliary bearing 41. The main bearing having the main bearing 42 is provided. Since the member 51 receives these working loads, its cylindrical outer peripheral surface is fixed to the inner peripheral surface of the main casing 3 by fitting or press-fitting.

  In particular, in the case of an electric compressor for vehicle air conditioning, the main casing 3 and the main bearing member 51 are made of an aluminum material in order to reduce the weight. Since the load on 42 is a large load of several hundred kgf, each fitting contact surface formed by the outer peripheral surface of the main bearing member 51 and the inner peripheral surface of the main body casing 3 needs to be set widely. Inevitable to become. The main bearing member 51 has an inner peripheral surface which is in contact with the main bearing 42 and an outer peripheral surface which is the other contact surface is in contact with the inner peripheral surface of the main casing 3 and is coaxial with the auxiliary bearing 41 on the right side in the figure. A high-precision machining finish is required to ensure a sufficient degree of accuracy, and high assembly accuracy is also required in fitting or press-fitting component assembly.

  Furthermore, in order to obtain the processing accuracy of the fitting contact surface and to obtain high fastening strength and rigidity after fitting or press-fitting, the fitting contact surface portion between the main body casing 3 and the main bearing member 51 has an appropriate accuracy and strength. Therefore, there is a problem that the electric compressor is further increased in size due to the thicknesses set for these two parts.

  The present invention solves the above-mentioned conventional problems, and there is no need for high-precision processing in the main body casing portion and the main bearing member, and there is no need for parts assembly such as insertion or press-fitting using the main body casing portion and the main bearing member. An object is to provide a noiseless electric compressor.

  In order to solve the above-described conventional problems, the present invention is an electric compressor that includes an electric motor and a compression mechanism portion inside a main body casing, and the compression mechanism portion is driven by a drive shaft from the electric motor. Is formed integrally with a partition wall portion having a housing support portion of a main bearing that axially partitions the inside of the main body casing and supports the drive shaft in a communication space portion between the compression mechanism portion and the electric motor. It is a thing.

  This eliminates the need for high-precision machine finishing, part assembly that requires high assembly accuracy, such as insertion or press-fitting, on the inner peripheral surface of the main casing or the outer surface of the main bearing member, and is also set for insertion or press-fitting. It is possible to provide an electric compressor that does not require a thickness in the fitting portion, is excellent in economy and productivity, and is small and low in noise.

  The electric compressor of the present invention does not require parts assembly that requires high-precision machining finish and high assembly accuracy, and can provide a small electric compressor excellent in economy and productivity.

A sectional view of an electric compressor according to Embodiment 1 of the present invention. A sectional view of a conventional electric compressor

A first invention is an electric compressor including an electric motor and a compression mechanism portion inside a main body casing, and configured to drive the compression mechanism portion by a drive shaft from the electric motor. In the communication space portion between the compression mechanism portion and the electric motor, a partition wall portion having a main bearing housing support portion that axially divides the main body casing and supports the drive shaft is integrally formed. is there.

  This eliminates the need for parts assembly that requires high precision machining finish, insertion or press-fitting on the inner peripheral surface of the main casing and the outer peripheral surface of the main bearing member, and is set for insertion or press-fitting. A wall thickness is unnecessary in the fitting portion, and it is possible to provide a small electric compressor that is excellent in economy and productivity.

  In the second invention, in particular, the electric motor of the first invention has a configuration in which the stator is fixed by bolting to the partition wall portion of the main body casing.

  Thereby, since the partition wall part formed integrally with the main body casing has high mechanical rigidity and vibration characteristics, the rotational vibration of the electric motor can be effectively suppressed and attenuated, and the noise of the electric compressor can be reduced. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking an in-vehicle electric compressor as an example. Note that the present invention is not limited to the following embodiments. In particular, in the present invention, a scroll compressor that compresses refrigerant by rotating a pair of scroll members as a compression unit will be described as an example, but it is easy to obtain the same effect even in other compression forms. Can be considered.

(Embodiment 1)
FIG. 1 shows an axial sectional view of an electric compressor according to an embodiment of the present invention. The same parts as those in the conventional example described with reference to FIG.

  In FIG. 1, a main body casing 410 includes an electric motor 5 including a stator 5 a and a rotor 5 b, a swirl spiral part 12 driven by the electric motor 5, a fixed spiral part 11, and an Oldham ring 57 as an example of a rotation restraining mechanism. The compression mechanism unit 4 is housed.

  The main body casing 410 is integrally formed with a partition wall portion 450 that divides the compression mechanism portion 4 and the electric motor 5 in the axial direction in addition to a substantially cylindrical casing that forms the outer shell wall of the electric compressor. Yes.

  The partition wall portion 450 of the main body casing 410 is formed with a storage support portion 450a of the main bearing 42 and a motion guide surface of an Oldham ring 57 as an example of a rotation restraint mechanism.

  The electric motor 5 is fixed by fastening the stator 5a to the partition wall 450 of the main body casing 410 with bolts 420 so that the drive shaft 14 can be rotationally driven by the rotor 5b fixed around the middle of the drive shaft 14. ing.

  The main body casing 410 is provided with an inverter case 102 at one end, which is the left side in the drawing, and a comp cover 430 at the other end, and is separated from the atmosphere.

  The operation of the electric compressor configured as described above will be described below.

Since the main body casing 410 is formed with the storage support portion 450a of the main bearing 42 and the motion guide surface of the Oldham ring 57 on the partition wall portion 450, which is a part of the main body casing 410, the main body casing 410 in the conventional electric compressor shown in FIG. There is no need for a special support component such as the main bearing member 51, and there is no need for high machining finishing accuracy and high-precision component assembly at the mating contact surface necessary to insert or press-fit such a member. It is excellent in economic efficiency and productivity. Further, it is possible to provide an electric compressor that does not require a thickness at the fitting portion and can be reduced in size.

  Further, in the present embodiment, the partition wall 450 of the main body casing 410 is integrally formed so as to close the cross section of the substantially cylindrical main body casing 410, and thus has high mechanical rigidity and vibration characteristics. The vibration caused by the fluctuating load loaded by the main bearing 42 can be effectively suppressed / damped, and the noise can be reduced.

  Furthermore, the electric motor 5 is fixed by bolting the stator 5a to the partition wall 450 formed integrally with the substantially cylindrical main body casing 410 and having high mechanical rigidity and vibration characteristics. With the configuration, the rotational vibration of the electric motor 5 can be effectively suppressed and attenuated, and the electric compressor can be reduced in noise.

  In the above embodiment, the description has been given of the on-vehicle electric compressor and the compression mechanism portion of the scroll compression type. However, the present invention is not limited to this, and for example, air conditioning for general households and business use. Needless to say, the present invention can be widely applied to various refrigeration apparatuses such as apparatuses and heat pump water heaters.

  As described above, the electric compressor according to the present invention eliminates the need for high-precision machining finish and parts assembly that requires high assembly accuracy, and provides a small-sized electric compressor excellent in economy and productivity. Therefore, it can be widely applied not only to a vehicle-mounted compressor but also to a machine having a mechanism portion driven by an electric motor.

4 Compression Mechanism 5 Electric Motor 5a Stator 5b Rotor 42 Main Bearing 57 Oldham Ring 410 Main Body Casing 420 Bolt 450 Partition Wall 450a Storage Support

Claims (2)

An electric compressor including an electric motor and a compression mechanism portion inside a main body casing, wherein the compression mechanism portion is configured to be driven by a drive shaft from the electric motor. The main body casing includes the compression mechanism portion and the electric motor. An electric compressor in which a partition wall portion having a housing support portion for a main bearing that divides the inside of the casing in the axial direction and supports the drive shaft is integrally formed in a communication space portion between them. The electric compressor according to claim 1, wherein the electric motor has its stator fixed to the partition wall by bolting.