JP2006077743A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor, capable of preventing deformation at a bearing boss part of a compression machine part, and achieving high reliability. <P>SOLUTION: This electric compressor is provided with a motor stator 41 comprising a winding 41b of concentrated winding at a tooth part 41a1 disposed radially from a center, and fixed to a bearing 31 of the compression machine part 3, and a permanent magnet rotor 42 disposed on the outer circumferential side of the stator 41. A stator core 41a is press-fitted to the bearing boss part 31a through a press-fit hole 41a3 provided in the stator core 41a, and a punched hole 41a4 is provided around the press-fit hole 41a3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric compressor, and more particularly to an electric compressor having an improved press-fit structure for a stator core and a compression mechanism bearing boss.

  Conventionally, as an external rotator type electric compressor, there is a structure shown in Patent Document 1, for example.

  This type of externally rotating rotor type electric compressor has a motor stator attached to the bearing of the compression mechanism section, an umbrella-shaped rotor is arranged on the outer peripheral side of the stator, and the inner periphery of the motor stator is the compression mechanism section. The bearing boss is fixed by press fitting.

However, in the conventional electric compressor, when the stator core is press-fitted into the bearing boss portion of the compression mechanism portion, the bearing boss portion 12a is deformed by the press-fitting stress, and the inner peripheral surface of the bearing boss portion that slides with the rotating shaft is deformed. Due to the deformation, the clearance between the rotating shaft and the bearing is changed, and the slidability becomes unstable and the reliability is lowered. In addition, the deformation can be reduced by adjusting the press-fitting allowance, but the press-fitting holding force becomes weak, and there is a risk of dropout or idling. Furthermore, the above-mentioned problem can be avoided by reducing the tolerance of the diameters of both, but there is room for improvement such as the need for high-precision machining.
JP 2001-268832 A

  The present invention has been made in consideration of the above-described circumstances, and an object thereof is to provide a highly reliable electric compressor that prevents deformation of a bearing boss portion of a compression mechanism portion.

  In order to achieve the above-described object, an electric compressor according to the present invention includes an electric motor stator that is wound and fixed to a bearing of a compression mechanism portion, and a permanent magnet rotation that is disposed on the outer peripheral side of the stator. In an electric compressor including a stator, the stator is press-fitted into a bearing boss portion of the bearing through a press-fitting hole provided in a stator core, and a punching hole is formed in the vicinity of the press-fitting hole. It is provided.

  According to the electric compressor according to the present invention, it is possible to prevent the deformation of the compression mechanism portion bearing boss portion and to provide a highly reliable electric compressor.

  Hereinafter, an embodiment of an electric compressor according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view of an electric compressor according to an embodiment of the present invention.

  As shown in FIG. 1, the electric compressor 1 according to the present embodiment is a two-cylinder rotary compressor, and has a hermetic container 2, and a cylinder 3 a and the cylinder are provided at the bottom of the hermetic container 2. The roller 3b which rotates eccentrically in the inside of 3a is provided, and the compression mechanism part 3 which compresses fluid is provided. The compression mechanism section 3 is provided with a rotation shaft 32 that is pivotally supported by the main bearing 31 and the sub-bearing 33 and to which a roller 3b is attached. The rotation shaft 32 is for operating the compression mechanism section 3. In this case, the airtight container 2 is disposed so as to extend in the axial direction. The main bearing 31 projects in a cylindrical shape in the axial direction along the outer periphery of the rotary shaft 32 to form a bearing boss portion 31a. On the outer periphery of the bearing boss portion 31a, a cylindrical stator 41 constituting a part of the electric motor 4 to be described later is fixed by fitting the inner periphery thereof.

  On the other hand, an umbrella-shaped rotor 42 is fixed to the upper end portion of the rotating shaft 32 that protrudes upward through the bearing boss portion 31a. The umbrella-shaped rotor 42 includes a flange portion 42a that extends radially outward from the tip portion of the rotating shaft 32, and a cylindrical portion that extends downward from the outer periphery of the flange portion 42a along the outer peripheral surface of the stator 41. A frame member 42d composed of 42b, an annular rotor core 42e provided on the inner peripheral surface of the cylindrical portion 42b of the frame member 42d and formed by laminating a number of electromagnetic steel plates, and an inner surface of the rotor core 42e. A permanent magnet 42c is provided on the peripheral surface and has a permanent magnet 42c made of a resin bonded magnet or the like. The electric motor 4 is configured such that the power is supplied through the terminal 43 and the umbrella-shaped rotor 42 rotates around the stator 41.

As shown in FIGS. 2 and 3, the stator 41 has a large number of electromagnetic steel plates are formed by stacking, the yoke portion 41e of the central portion, and a magnetic pole tooth portion 41a ₁ which is disposed radially from the yoke portion 41e having a stator iron core 41a, made up of a stator coil 41b, which is concentrated winding from the slot opening 41a ₂ to each magnetic pole teeth 41a ₁ through the bobbin (insulator member) of the stator core 41a, the stator coil 41b Is connected to the cluster 41d through a lead wire 41c.

In addition, the stator core 41a, in the vicinity of the inner circumference near i.e. bearing boss portion press-fitting hole 41a ₃ of the yoke portion 41e, arcuate punched holes 41a ₄ along the periphery of the bearing boss portion press-fitting hole 41a ₃ is 3 It is provided at equal intervals. This occurs when the yoke portion 41e positioned on the inner peripheral side of the punched hole 41a ₄ opposite to the punching hole 41a ₄ is easily deformed becomes thin, press-fitting the stator core 41a in the bearing boss section 31a The press-fitting stress is relieved by the deformation of the thin portion of the yoke portion 41e. As a result, a large press-fitting stress to the bearing boss section 31a ₂ is prevented from acting, it is possible to improve the reliability by preventing the bearing boss section 31a ₂ deformation.

As shown in FIG. 4, notches 41a ₅ may be provided around bearing boss portion press-fitting holes 41a ₃ that face portions where the punching holes 41a ₄ of the stator core 41a are not provided. Further, as shown in FIG. 5 may be provided each notch 31a ₁ on the outer periphery of the bearing boss portion 31a which faces the site of punching holes 41a ₄ is not provided. Thus, deformation of the bearing boss section 31a ₂ is further reduced.

  Reference numeral 5 denotes an inner peripheral flange of the bobbin, and reference numeral 6 denotes an insulating bobbin outer flange.

Since the electric compressor of this embodiment having the above structure, when assembling the electric compressor 4 will be press fit the bearing boss portion 31a of the main bearing portion 31 to the bearing boss portion fitting hole 41a ₁ of the stator core 41a, the bearing since arcuate punched hole 41a ₄ in the vicinity of the boss portion press-fitting hole 41a ₁ along the periphery of the bearing boss portion fitting hole 41a ₁ is provided, the outer periphery of the bearing boss portion press-fitting hole 41a ₃ and punching holes 41a narrow portion between ₄ tends to deform as the arrows in FIG. 1, it is possible to prevent the deformation of the bearing boss portion 31a, the sliding of the bearing 31 stable and reliable electric compressor realized, further, it is possible to reduce the variation in the press-fitting retaining force resulting from the dimensional accuracy of the bearing boss portion fitting hole 41a ₁ and the bearing boss portion 31a.

  As described above, according to the electric compressor of the present embodiment, even if the stator iron core is press-fitted into the bearing boss portion through the press-fitting hole, the punching hole is provided in the vicinity of the press-fitting hole. The deformation of the boss portion is prevented, and a highly reliable electric compressor with stable slidability of the bearing can be provided.

The longitudinal cross-sectional view of the electric compressor which concerns on one Embodiment of this invention. The top view of the stator of the electric compressor which concerns on one Embodiment of this invention. The top view of the stator core of the electric compressor which concerns on one Embodiment of this invention. The top view of the stator of the electric compressor which concerns on other embodiment of this invention. The top view of the stator of the electric compressor which concerns on other embodiment of this invention. The top view of the bearing of the electric compressor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric compressor, 2 ... Sealed container, 3 ... Compression mechanism part, 31 ... Bearing, 31a ... Bearing boss part, 31a ₁ ... Notch, 32 ... Rotating shaft, 4 ... Electric motor, 41 ... Electric motor stator, 41a ... Stator iron core, 41a ₂ ... coil groove, 41a ₄ ... punching hole, 41a ₁ ... tooth part, 41a ₃ ... bearing boss part press-fitting hole, 41b ... fixed coil, 42 ... umbrella rotor, 42a ... flange part, 42b ... cylindrical part, 42c ... permanent magnet.

Claims (2)

An electric compressor comprising a motor stator that is wound and fixed to a bearing of a compression mechanism section, and a permanent magnet rotor disposed on an outer peripheral side of the motor stator. An electric compressor characterized in that the stator is press-fitted into a bearing boss portion of the bearing through a press-fitting hole provided in the stator core, and a punching hole is provided in the vicinity of the press-fitting hole. . 2. The electric compressor according to claim 1, wherein a notch is provided around the press-fitting hole facing a portion where the punching hole of the stator core is not provided or on the outer periphery of the bearing boss portion.

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