JP2011102543A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor improving the rigidity of a casing and inhibiting noise of the compressor. <P>SOLUTION: The compressor 1 includes the body casing 2 and an electric motor 3 and the electric motor 3 has a stator 8 and a rotor 9. The stator 8 has an annular yoke part 40 and a plurality of teeth 37. The teeth 37 extend inward from the inner peripheral face of the yoke part 40. The rotor 9 is arranged rotatably to the stator 8. The body casing 2 and the outer peripheral face of the stator 8 are welded with a predetermined clearance provided between them. A plurality of welding pints 7 larger than the number of the teeth 37 are provided on the outer peripheral face of the yoke part 40, in a planar view at the stator 8. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a compressor in which a stator of an electric motor is fixed to a main body casing by welding.

  Conventionally, with respect to a stator (stator) of an electric motor used for a compressor, a method of attaching the casing body to a pipe has been shrink-fitted. The shrink-fit holding force is determined so as to have a sufficient holding force against the rotational torque of the motor and the impact load at the time of dropping.

  On the other hand, the stator core, which is the main body portion of the stator, has the property of increasing iron loss under compressive stress, and there is a risk that motor efficiency may be reduced due to increased loss due to compressive stress during shrink fitting.

  Therefore, in order to prevent external compressive stress from affecting the stator, the outer peripheral surface of the annular yoke portion of the stator and the pipe of the casing body portion are connected at a plurality of welding points by tag (TAG) welding or the like at about three points. There is a spot welded structure.

  For example, in Patent Document 1 (Japanese Patent No. 3960347) and Patent Document 2 (Japanese Patent No. 4241849), an annular yoke portion of a stator and a mechanical portion such as a compression mechanism are respectively attached to a pipe of a casing body portion. It is welded at about 3 welding points.

  However, when spot welding is performed on the stator and the pipe of the casing body at a conventional welding location, the pipe of the casing body is fixed between the stator and the stator as compared with the case of shrink fitting. Since it becomes weak, the rigidity of the pipe tends to be lowered, which may make it difficult to suppress the noise of the compressor.

  In particular, in the case of a compressor that uses CFC refrigerant R410A, which is mainly used for air conditioning, the design pressure is lower than that of carbon dioxide (CO2) refrigerant. The rigidity of the casing body pipe itself is low. Therefore, the vibration mode is easily generated in the high frequency range due to the deformation of the pipe of the casing body. Further, due to deformation of the stator due to stress applied during welding, there is a possibility that the gap between the stator and the rotor, that is, the inner peripheral surface of the teeth forming the air gap is deformed unevenly and the air gap is biased.

  The subject of this invention is providing the compressor which can improve the rigidity of a casing and can suppress the noise of a compressor.

  The compressor of the first invention includes a main body casing and an electric motor, and the electric motor has a stator and a rotor. The stator has an annular yoke portion and a plurality of teeth. The teeth extend inward from the inner peripheral surface of the yoke portion. The rotor is rotatably arranged with respect to the stator. The main casing and the outer peripheral surface of the stator are welded with a predetermined gap. In plan view of the stator, a plurality of welding points equal to or greater than the number of teeth are provided on the outer peripheral surface of the yoke portion.

  Here, in a plan view of the stator, since a plurality of welding points equal to or more than the number of teeth are provided on the outer peripheral surface of the yoke portion, the restraining force of the main body casing is increased by welding to suppress vibration and noise. Is possible.

  The compressor of the second invention is the compressor of the first invention, and the welding points are arranged at substantially equal pitches on the outer peripheral surface of the yoke portion in plan view of the stator.

  Here, since the welding points are arranged at substantially equal pitches on the outer peripheral surface of the yoke portion in plan view in the stator, it becomes possible to increase the binding force of the main body casing evenly over the entire circumference by welding, Noise can be suppressed more effectively.

  The compressor of the third invention is the compressor of the first invention or the second invention, and at least one welding point is provided between two adjacent teeth in a plan view of the stator.

  Here, since at least one welding point is provided between two adjacent teeth in a plan view of the stator, an air gap in which the tensile stress caused by welding is a gap between the inner peripheral surface of the teeth and the rotor. Does not affect the gap.

  The compressor according to a fourth aspect is the compressor according to any one of the first to third aspects, wherein a plurality of welding points are provided so that two adjacent welding points have different heights. ing.

  Here, since a plurality of welding points are provided so that two adjacent welding points have different heights, it becomes possible to increase the binding force of the main body casing over the height direction by welding, It is possible to more effectively suppress vibration and noise.

  A compressor according to a fifth aspect is the compressor according to any one of the first to fourth aspects, wherein the stator is manufactured by laminating a plurality of steel plates and caulking between two adjacent welding points. Has been.

  Here, since the stator is manufactured by laminating a plurality of steel plates and caulking between two adjacent welding points, it is possible to make it difficult to transmit the tensile stress due to welding to the inner peripheral surface of the teeth. It is. Further, it is possible to suppress vibrations in the high frequency region of the stator.

  According to the first invention, it is possible to suppress vibration and noise by increasing the restraining force of the main casing by welding.

  According to the second aspect of the invention, the restraining force of the main casing can be uniformly increased over the entire circumference by welding, whereby vibration and noise can be more effectively suppressed.

  According to the third aspect of the invention, the tensile stress due to welding does not affect the air gap gap that is the gap between the inner peripheral surface of the teeth and the rotor.

  According to the fourth aspect of the invention, the restraining force of the main casing can be increased over the height direction by welding, whereby vibration and noise can be more effectively suppressed.

  According to the fifth aspect of the invention, it is possible to make it difficult for the tensile stress due to welding to be transmitted to the inner peripheral surface of the tooth. Further, vibrations in the high frequency region of the stator can be suppressed.

1 is a longitudinal sectional view of a hermetic compressor according to an embodiment of a compressor of the present invention. II-II sectional view taken on the line of the hermetic compressor of FIG. The top view which shows the stator and welding point of FIG. The horizontal sectional view which shows the inside of the compression mechanism of FIG.

  Next, an embodiment of the compressor of the present invention will be described with reference to the drawings.

Embodiment
The hermetic compressor 1 shown in FIGS. 1 and 2 is used for compressing a refrigerant of an air conditioner, and includes a casing 2, an electric motor 3, a compression mechanism 4, an accumulator 5, and a shaft 6. I have. The electric motor 3, the compression mechanism 4 and the shaft 6 are accommodated in the casing 2.

  The sealed cylindrical casing 2 includes a cylindrical portion 10 and a pair of end plates 11 and 12 that close upper and lower opening ends of the cylindrical portion 10. The cylindrical portion 10 of the casing 2 houses a stator 8 and a rotor 9 of the electric motor 3 described later. In the cylindrical casing 2, either the cylindrical portion 10 and the end plates 11 and 12 that close the upper and lower opening ends may be integrated (that is, whether the cylindrical portion and the upper end plate are integrated). The cylindrical portion and the lower end plate may be integrated, and the casing 2 may be composed of two parts).

<Configuration of electric motor 3>
The electric motor 3 includes an annular stator 8 (stator), a rotor 9 (rotor) rotatably disposed in the internal space 8a of the stator 8, a plurality of coils 38, and a plurality of magnets 35. . For example, the electric motor 3 is a concentrated winding type electric motor in which the stator 8 is provided with a coil 38 via insulators 50a and 50b.

  The rotor 9 is connected to the shaft 6, can rotate with the shaft 6, and is disposed so as to be rotatable with respect to the stator 8.

  As shown in FIGS. 1 and 2, the magnet 35 is inserted into a plurality of (for example, six) slots 9 a extending in the axial direction of the rotor 9, and disposed so as to face the magnetic field generated from the coil 38. Yes.

<Description of stator>
The stator 8 shown in FIGS. 1 to 3 includes an annular yoke portion 40 and a plurality of (for example, nine) teeth 37 extending inward from the inner peripheral surface of the yoke portion 40. The plurality of coils 38 are wound and fixed around a plurality of (for example, nine) teeth 37 extending inwardly from the yoke portion 40 of the stator 8. When a plurality of coils 38 are energized, a magnetic field is generated.

  The stator 8 is manufactured so that the yoke portion 40 and the teeth 37 are integrated by caulking in a state where a plurality of steel plates are laminated. In the stator 8 shown in FIG. 3, a caulking portion 42 is formed near the root (back portion) of each tooth 37.

  The casing 2 and the outer peripheral surface of the stator 8 are welded in a state where a predetermined gap is provided (so-called gap fitting state).

  In plan view of the stator 8 shown in FIG. 3, a plurality of welding points 7 (9 places in FIG. 3) equal to or more than the number of teeth 37 (9 pieces in FIG. 3) are provided on the outer peripheral surface of the yoke portion 40. That is, as shown in FIGS. 2 to 3, the electric motor 3 of the present embodiment is a so-called 6-pole 9-slot electric motor having six magnets 35 and nine teeth 37, and the number of teeth 37 is nine. Correspondingly, nine welding points 7 are provided. Thereby, it is possible to increase the binding force of the casing 2 and suppress vibration and noise.

  Further, the welding points 7 are arranged on the outer peripheral surface of the yoke portion 40 at substantially equal pitches (approximately 40 degrees at substantially equal intervals) in a plan view of the stator 8 in FIG.

  Further, one welding point 7 in FIGS. 1 to 3 is provided at the same height between two adjacent teeth 37 in a plan view of the stator 8.

  Moreover, a plurality of welding points 7 are provided so that two adjacent welding points 7 have different heights.

  That is, the welding point 7 shown in FIG. 1 is provided in two upper and lower stages between two adjacent teeth 37. Note that three or more welding points 7 may be provided. For example, when there are three welding points, one of the welding points is provided at the center of the stator height, and the remaining two stages are provided at symmetrical height positions with respect to the stator height center.

  Here, when a plurality of welding points 7 are arranged at different heights, for example, the neighboring welding points 7 may be arranged in a staggered manner by shifting the welding points 7 adjacent in the vertical direction so as to form a triangle.

  The stator 8 is manufactured by laminating a plurality of steel plates and caulking between two adjacent welding points 7. Thus, by providing the caulking portion 42 on the back portion of the tooth 37, it is possible to make it difficult for the tensile stress due to welding to be transmitted to the inner peripheral surface of the tooth 37.

<Configuration of compression mechanism 4>
As shown in FIGS. 1 and 4, the compression mechanism 4 includes a swinging piston 21 having a blade 22, a bush 23 that supports the blade 22 so as to be swingable, and a cylinder 27. The cylinder 27 has a cylinder chamber 24 that houses the swing piston 21 and a bush hole 25 into which the bush 23 is rotatably inserted.

  The oscillating piston 21 receives the rotational driving force of the electric motor 3, and the eccentric portion 6 a of the shaft 6 rotates eccentrically, thereby oscillating inside the cylinder chamber 24, and thereby the refrigerant sucked from the suction pipe 28. Is compressed inside the cylinder chamber 24. The compressed refrigerant rises through the inside of the casing 2 and is discharged from the discharge pipe 29.

  The cylinder 27 has a lower block 27a and an upper block 27b. The cylinder 27 is screwed to the mounting plate 30. The mounting plate 30 is fixed to the cylindrical portion 10 of the casing 2 by a mounting plate joining portion 31. The mounting plate joint 31 is formed by spot welding.

<Features>
(1)
In the hermetic compressor 1 of the present embodiment, in the plan view of the stator 8 shown in FIG. 3, a plurality of welding points 7 (9 places in FIG. 3) equal to or more than the number of teeth 37 (9 places in FIG. 3) are yokes. Since it is provided on the outer peripheral surface of the portion 40, it is possible to suppress vibration and noise by increasing the restraining force of the casing 2 by welding.

  In particular, the thin casing 2 compatible with chlorofluorocarbon refrigerant (R410A, etc.) is prone to vibration, but by providing nine welding points 7, it is possible to improve the rigidity of the casing and achieve suppression of vibration and noise. It is.

(2)
That is, in the present embodiment, the stator 8 and the cylindrical portion 10 of the trunk portion of the casing 2 between two adjacent teeth 37 at nine welding points 7 equal to or more than the number of teeth 37 (9). As a result of the welding between the nine stators 8 and the cylindrical part 10, there are joined parts at substantially equal pitches in the circumferential direction. Since the cylindrical portion 10 is constrained by the stator 8 by these joint portions, it is possible to suppress the generation of vibration modes in a high frequency range due to deformation of the cylindrical portion 10 and realize a low noise compressor. Is possible.

  Moreover, since the laminated steel plates constituting the stator 8 are also constrained by the cylindrical portion 10 by these joint portions, generation of vibration modes in a high frequency range due to deformation of each steel plate (and the entire stator 8) is suppressed. It is also possible.

(3)
Further, in the hermetic compressor 1 of the present embodiment, since the welding points 7 are arranged on the outer peripheral surface of the yoke portion 40 in a plan view of the stator 8 at a substantially equal pitch (approximately every 40 degrees at regular intervals), welding is performed. Thus, the restraining force of the casing 2 can be increased uniformly over the entire circumference, and vibration and noise can be more effectively suppressed.

(4)
Further, in the hermetic compressor 1 according to the present embodiment, the welding points 7 in FIGS. 1 to 3 are provided one by one at the same height between two adjacent teeth 37 in a plan view of the stator 8. Therefore, the tensile stress caused by welding does not affect the air gap gap 44 that is the gap between the inner peripheral surface of the teeth 37 and the rotor 9.

(5)
Further, in the hermetic compressor 1 according to the present embodiment, a plurality of welding points 7 are provided so that two adjacent welding points 7 have different heights. The force can be increased in the height direction (axial direction of the shaft 6), and vibration and noise can be more effectively suppressed.

(6)
Furthermore, in the hermetic compressor 1 of the present embodiment, the stator 8 is manufactured by laminating a plurality of steel plates and caulking between two adjacent welding points 7, so that tensile stress due to welding is increased. It is possible to make it difficult to convey to the inner peripheral surface of the teeth 37. Further, it is possible to suppress vibration in the high frequency region of the stator 8.

  Further, by providing the caulking portion 42 on the back portion of the tooth 37 and performing welding between the teeth 37, a portion having a low rigidity in the vertical direction of the stator 8 can be compensated by welding fixation. Thereby, it is possible to suppress the occurrence of the deformation mode of the stator 8 in a high frequency region that occurs in a portion where the vertical rigidity of the stator 8 is weak.

  The present invention can be variously applied to a compressor in which a stator of an electric motor is fixed to a main body casing by welding.

DESCRIPTION OF SYMBOLS 1 Hermetic compressor 2 Casing 3 Electric motor 6 Shaft 7 Welding point 8 Stator 9 Rotor 35 Magnet 37 Teeth 38 Coil 40 Yoke 42 Caulking part 43 Grooves 50a and 50b Insulator

Japanese Patent No. 3960347 Japanese Patent No. 4241849

Claims (5)

A body casing (2);
A stator (8) having an annular yoke portion (40) and a plurality of teeth (37) extending inwardly from an inner peripheral surface of the yoke portion (40), and rotatable with respect to the stator (8) An electric motor (3) having a rotor (9) arranged;
With
In the compressor (1) welded in a state where a predetermined gap is provided between the main casing (2) and the outer peripheral surface of the stator (8),
In plan view of the stator (8), a plurality of welding points (7) equal to or more than the number of the teeth (37) are provided on the outer peripheral surface of the yoke part (40).
Compressor (1). The welding points (7) are arranged at a substantially equal pitch on the outer peripheral surface of the yoke part (40) in a plan view of the stator (8).
The compressor (1) according to claim 1. At least one welding point (7) is provided between two adjacent teeth (37) in a plan view of the stator (8).
The compressor (1) according to claim 1 or 2. A plurality of the welding points (7) are provided so that two adjacent welding points (7) have different heights.
The compressor (1) according to any one of claims 1 to 3. The stator (8) is manufactured by laminating a plurality of steel plates and caulking between two adjacent welding points (7).
The compressor (1) according to any one of claims 1 to 4.

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