JP2011055576A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor which can suppress the deformation of the inside portion of a stator caused by welding, and can suppress a sound and vibration resulting form the deformation. <P>SOLUTION: The compressor 1 has a cylindrical body casing 2 and an electric motor 3. The electric motor 3 has the stator 8 fixed to the inside of the body casing 2, and a rotor 9 which is rotatably arranged with respect to the stator 8. The stator 8 has a protrusion 41 which is partially thickened, and outwardly protrudes in the radial direction at its external peripheral face. The internal wall of the body casing 2 and the protrusion 41 at the external peripheral face of the stator 8 are welded. <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, there are various methods for fixing a stator which is a stator of an electric motor inside a compressor casing. For example, the stator is fixed to the pipe of the casing body and the inner wall of the stator by shrink fitting or welding. Yes.

  In addition, as described in Japanese Patent Application Laid-Open No. 2007-318876, there is a structure in which a gap is fitted by fitting a rib on the outer peripheral surface of an annular yoke portion of a stator and a concave portion of a casing. Since the structure is not a weld-fixed but a connection by internal irregularities, the structure is complicated, and the fixed state of the stator is weaker than the above-described shrink fitting or welding.

  Here, when shrink fitting is performed as a method for fixing the pipe of the casing body and the stator, there is a problem that a large compressive stress is applied to the outer periphery of the stator in contact with the pipe, and the inner diameter of the stator is deformed.

  Therefore, in order to suppress the influence of external compressive stress on the stator, it has been proposed that spot-shaped tag (TAG) welding is performed at a plurality of welding locations on the outer peripheral surface of the yoke portion and the pipe (casing body). Has been.

  However, as a method of fixing the pipe and the stator, when tag welding is performed with a gap fit, tensile stress from the welded portion to the outside (pipe side) is applied to the stator, and the stator inner diameter may be deformed. . As a result, the shape of the stator becomes non-uniform, and there is a possibility that a tooth portion that is easy to flow magnetic flux and a tooth portion that is difficult to flow are generated, which may increase noise and vibration of the compressor.

  The subject of this invention is providing the compressor which can suppress a deformation | transformation of the inner part of a stator by welding, and can suppress a sound and a vibration by it.

  The compressor of the 1st invention is provided with the cylindrical main part casing and the electric motor. The electric motor has a stator fixed inside the main casing and a rotor arranged to be rotatable with respect to the stator. The stator has a protruding portion that protrudes radially outward on the outer peripheral surface thereof and is partially thickened. In addition, the space between the inner wall of the main body casing and the protruding portion of the outer peripheral surface of the stator is welded.

  Here, the stator of the electric motor has a protruding portion that protrudes radially outward on the outer peripheral surface thereof and is partially thickened, and the gap between the inner wall of the main body casing and the protruding portion of the outer peripheral surface of the stator is between. Since it is welded, it is possible to suppress deformation of the inner part of the stator due to welding, and it is possible to reduce noise and vibration during operation of the compressor.

  The compressor of the second invention is the compressor of the first invention, and the compressed refrigerant uses CO2.

  Here, CO2 is used as the compressed refrigerant. However, even when lubricating oil having a high viscosity is used together with the CO2 refrigerant, the oil return passage is widened by the protrusions on the outer periphery of the stator, so that the effect of suppressing a decrease in the flow of oil is suppressed. Is big.

  The compressor of the third invention is the compressor of the first invention, wherein the ratio of the radial thickness of the portion of the stator where the protruding portion protrudes to the average radial thickness of the other portion is 1.2: 1 or more.

  Here, since the ratio of the radial thickness of the protruding portion to the radial average thickness of the other portion is 1.2: 1 or more, the rigidity of the protruding portion is increased and the stator is welded. It is possible to suppress deformation of the inner portion of the. The “other portion (of the portion where the protruding portion protrudes)” here is a portion of the stator that does not include the tooth portion. For example, the stator outer diameter of the slot without the protruding portion is R ( It means the average thickness of the curved part.

  A compressor according to a fourth aspect of the present invention is the compressor according to the first aspect of the present invention, and a space is formed inside the protruding portion corresponding to the position to be welded.

  Here, since a space is formed inside the protrusion corresponding to the position to be welded, the deformation of the inner part of the stator can be suppressed by facilitating deformation of only the protrusion by welding. Is possible.

  A compressor according to a fifth aspect is the compressor according to the fourth aspect, wherein the space portion is at least one groove formed on a surface different from the surface to be welded in the protrusion portion. By making only the portion easily deformable by welding, it is possible to suppress deformation of the inner portion of the stator. Moreover, since the grooves are exposed to the outside, the grooves can be easily processed.

  A compressor according to a sixth aspect of the present invention is the compressor according to any one of the first to fifth aspects of the present invention, wherein the protruding portion is formed of a material having a Young's modulus lower than that of the portion other than the protruding portion in the stator.

  Here, the protrusion is made of a material having a lower Young's modulus than the portion other than the protrusion in the stator, so that deformation of the inner portion of the stator can be suppressed, and noise and vibration during operation of the compressor are reduced. Is possible.

  A compressor according to a seventh aspect is the compressor according to any one of the first to sixth aspects, wherein the stator is manufactured by caulking a plurality of laminated steel plates at the positions of the protrusions.

  Here, since the stator is manufactured by caulking a plurality of laminated steel plates at the position of the protruding portion, it is possible to suppress the caulking portion from interfering with the magnetic flux inside the stator, and to improve efficiency. It becomes possible to provide a good electric motor.

  The compressor according to an eighth aspect of the present invention is the compressor according to any one of the first to seventh aspects of the present invention, wherein the stator has a recess formed between two adjacent protrusions on the outer peripheral surface thereof.

  Here, since the concave portion is formed between the two protruding portions adjacent to each other on the outer peripheral surface of the stator, it is possible to reduce the thick portion of the stator and balance the whole, and the sound and vibration Can be further reduced.

  According to the first invention, it is possible to suppress deformation of the inner portion of the stator due to welding, and it is possible to reduce noise and vibration during operation of the compressor.

  According to the second invention, even when lubricating oil having a high viscosity is used together with the CO2 refrigerant, the oil return passage is widened by the protrusions on the outer periphery of the stator, so that the effect of suppressing the oil flow reduction is great.

  According to the third invention, it is possible to increase the rigidity of the protruding portion and suppress deformation of the inner portion of the stator due to welding.

  According to the fourth invention, deformation of the inner portion of the stator can be suppressed.

  According to the fifth aspect of the present invention, the deformation of the inner portion of the stator can be suppressed by facilitating deformation of only the protruding portion by welding with the groove. In addition, the grooves can be easily processed.

  According to the sixth aspect, deformation of the inner portion of the stator can be suppressed, and noise and vibration during operation of the compressor can be reduced.

  According to the seventh invention, it is possible to suppress the caulking portion from interfering with the magnetic flux inside the stator, and it is possible to provide an efficient electric motor.

  According to the eighth aspect of the invention, the thick portion of the stator can be reduced to balance the whole, and sound and vibration can be further reduced.

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 of the stator of FIG. The horizontal sectional view which shows the inside of the compression mechanism of FIG. The enlarged plan view of the protrusion part of the outer peripheral surface of the stator of FIG. The enlarged plan view of the protrusion part which has a through-hole which is a modification of this invention. The enlarged plan view of the protrusion part which has a groove | channel on the both sides | surfaces which are the other modifications of this invention. The enlarged plan view of the protrusion part which a groove | channel extends from the side surface of the one side which is another modification of this invention to a center. The enlarged plan view of the protrusion part with a low Young's modulus which is another modification of this invention. The enlarged plan view of the protrusion part in which the crimping part which is the further another modification of this invention was formed.

  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 the CO2 refrigerant of the hot water heater, 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.

<Configuration of hermetic compressor 1>
The hermetic compressor 1 includes a casing 2, an electric motor 3 and a compression mechanism 4 disposed in the casing 2, and an accumulator 5 disposed on the side of the casing 2. The compressor 1 is a so-called high-pressure dome type compressor and uses a CO2 refrigerant. In the compressor 1, the compression mechanism 4 is disposed below the electric motor 3 in the casing 2. In addition, lubricating oil supplied to each sliding portion of the compression mechanism 4 is stored in the lower portion of the casing 2.

<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. . The electric motor 3 is stored in the casing 2 in a state where the stator 8 is fixed to the inner wall of the casing 2.
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 and fixed in a plurality of (for example, six) slots 9 a extending in the axial direction of the rotor 9, and is disposed so as to face the magnetic field generated from the coil 38. ing.

<Description of stator>
The stator 8 shown in FIGS. 1 to 3 and FIG. 5 includes an annular yoke portion 40, a plurality of (for example, nine) teeth 37 extending inward from the inner peripheral surface of the yoke portion 40, and a plurality of protruding portions 41. have.

  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 formed by caulking or welding a plurality of laminated steel plates (for example, a thin silicon steel sheet having a thickness of 0.5 mm or less) so that the yoke portion 40, the teeth 37, and a protruding portion 41 described later are integrated. It is manufactured. In the stator 8 shown in FIG. 3, a caulking portion 42 is formed near the root (back portion) of each tooth 37.

  Further, as shown in FIGS. 3 and 5, three protrusions 41 are formed at equal intervals in the circumferential direction of the stator 8 by protruding radially outward on the outer peripheral surface of the stator 8 and partially thickening. ing.

  The projecting portion 41 is a solid substantially rectangular parallelepiped having a substantially fan-shaped or substantially rectangular horizontal cross section.

  The stator 8 is tag-welded between the inner wall of the cylindrical portion 10 of the casing 2 and the protruding portion 41 on the outer peripheral surface of the stator 8, so that the gap 13 (FIG. 1 to FIG. 1) is formed between the stator 8 and the cylindrical portion 10. 2) is secured. Thereby, it is possible to suppress the deformation | transformation of the inner part of the stator by welding.

  In the present embodiment, as shown in FIG. 1, since there are two welded portions 7 by upper and lower tag welding in each of the three projecting portions 41, the stator 8 is tag welded at a total of six locations.

  Further, as shown in FIGS. 3 and 5, the protrusion 41 in the stator 8 protrudes so that the rigidity of the protrusion 41 can be increased and the deformation of the inner portion of the stator 8 due to welding can be surely suppressed. The ratio between the radial thickness δ1 of the portion and the average radial thickness δ2 of the other portion is set to δ1 / δ2 ≧ 1.2. Here, the portion other than that (the portion from which the protruding portion 41 protrudes) is a portion of the stator 8 that does not include the teeth 37. For example, the stator outer diameter of the slot without the protruding portion 41 is R (curved surface). ) Means the average thickness δ2 (see FIG. 3).

  The practicable range is about 1.5 ≧ δ1 / δ2 ≧ 1.2, but if δ1 / δ2 is about 1.4, the effect of suppressing deformation of the stator 8 is high, and the performance of the electric motor 3 is degraded. This is most preferable in terms of implementation.

  Further, if δ1 / δ2 ≧ 1.2, a refrigerant passage can be secured between the stator 8 and the casing 2, and there is no influence on deterioration of the iron loss of the stator 8 due to welding with a pipe. A high-performance compressor can be provided.

  Further, the stator 8 is formed with a groove 43 extending in the axial direction of the stator 8 as a recess between two adjacent protruding portions 41 on the outer peripheral surface thereof. An insulator (not shown) sandwiched between the stator 8 and the casing 2 can be fixed to the groove 43.

<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 oscillating piston 21, a bush hole 25 into which the bush 23 is rotatably inserted, and an oil supply communication hole 26 that communicates with the bush hole 25.

  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 according to the embodiment, as shown in FIGS. 1 to 3 and FIG. Have. Moreover, the stator 8 is fixed by tag welding between the inner wall of the tubular portion 10 of the casing 2 and the protruding portion 41 on the outer peripheral surface of the stator 8.

  Thereby, it is possible to suppress the deformation | transformation of the inner part of the stator 8 by welding. Therefore, the shape of the stator 8 becomes uniform, there is no possibility that the teeth 37 that are easy to flow magnetic flux and the teeth 37 that are difficult to flow are generated, and it is possible to reduce noise and vibration during operation of the compressor.

(2)
Further, in the hermetic compressor 1 of the embodiment, as shown in FIGS. 3 and 5, the radial thickness δ1 of the portion of the stator 8 where the protruding portion 41 protrudes and the average of the other portions in the radial direction. Since the ratio with respect to the thickness δ2 is 1.2: 1 or more, the rigidity of the protrusion 41 can be increased, and deformation of the inner portion of the stator 8 due to welding can be reliably suppressed.

(3)
Further, the hermetic compressor 1 according to the embodiment has a groove 43 formed on the outer peripheral surface of the stator 8 so as to extend in the axial direction of the stator 8 as a recess between two adjacent protruding portions 41. Therefore, it is possible to balance the whole by slightly shaving the thick portion of the annular yoke portion 40, and the effect of reducing sound and vibration is further enhanced.

(4)
Moreover, in the hermetic compressor 1 of the embodiment, CO2 is used as a compressed refrigerant. The CO2 refrigerant is usually used together with a high-viscosity lubricating oil. When the viscosity increases, the lubricating oil tends to hardly flow. However, in the hermetic compressor 1 of the present embodiment, the protrusion 41 is provided on the outer peripheral surface of the stator 8. As a result, the oil return passage is widened, so that even a highly viscous lubricating oil has a great effect of suppressing a decrease in flow.

<Modification>
(A)
In the said embodiment, although the protrusion part 41 has shown the example which consists of a solid block with high rigidity, this invention is not limited to this, As shown in FIGS. A space (through hole 45, grooves 46, 47) may be formed in the interior of each of the spaces corresponding to the welded portions 7 that are welding positions. In these cases, by deforming only the projecting portion 41 by welding, deformation of the inner portion of the stator 8 can be suppressed, and noise and vibration during operation of the compressor can be reduced.

(B)
In particular, as shown in FIGS. 7 to 8, when forming one or two grooves 46, 47 formed on a surface different from the surface 41 a to be welded in the protrusion 41, these grooves 46, 47 are Since it is exposed to the outside, processing is easy. Further, since the grooves 46 and 47 are separated from the welded portion 7, the groove width can be set without considering interference with the welded portion 7.

  On the other hand, when the through hole 45 extending in the axial direction of the stator 8 is formed inside the protrusion 41 as shown in FIG. 6, the wall 41 b is supported stably at both ends of the through hole 45. It is possible to hold.

(C)
Furthermore, as another modification of the present invention, as shown in FIG. 9, even if the protruding portion 48 is formed of a material having a Young's modulus lower than that of the portion other than the protruding portion 48 in the stator 8, Deformation can be suppressed, and noise and vibration during operation of the compressor can be reduced.

  For example, the yoke portion 40 and the teeth 37 of the stator 8 may be manufactured from a steel plate, and only the protrusion 48 may be manufactured from a material having a Young's modulus lower than that of the steel plate (for example, an aluminum material).

(D)
As still another modification of the present invention, as shown in FIG. 10, the stator 8 includes a plurality of laminated steel plates in the position of the protrusion 41 so that the caulking portion does not hinder the magnetic flux inside the stator 8. It may be produced by caulking. In FIG. 10, a caulking portion 49 is formed near the center of the protruding portion 41.

  In this case, by setting the position of the caulking portion 49 to a thick position on the outer peripheral side of the yoke portion 40 (so-called back yoke), it is possible to suppress the caulking portion 49 from obstructing the magnetic flux inside the stator 8. It becomes possible to provide the electric motor 3 with good efficiency.

  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 8 Stator 9 Rotor 35 Magnet 38 Coil 41, 48 Projection part 45 Through-hole 46, 47 Groove 49 Caulking part

JP 2007-318876 A

Claims (8)

A cylindrical body casing (2);
Compressor comprising a stator (8) fixed inside the main casing (2) and an electric motor (3) having a rotor (9) arranged to be rotatable with respect to the stator (8). In (1),
The stator (8) has protrusions (41, 48) that protrude radially outward on the outer peripheral surface thereof and are partially thickened.
The inner wall of the main casing (2) and the protrusions (41, 48) on the outer peripheral surface of the stator (8) are welded.
Compressor (1).   The compressor according to claim 1, wherein the compressed refrigerant uses CO2. The ratio of the radial thickness of the portion of the stator (8) where the protruding portions (41, 48) protrude to the average radial thickness of the other portions is 1.2: 1 or more.
The compressor according to claim 1. Inside the protrusion (41), spaces (45, 46, 47) are formed corresponding to the positions to be welded.
The compressor according to claim 1. The space portion is at least one groove (46, 47) formed on a surface different from the surface to be welded in the protrusion (41).
The compressor according to claim 4. The protrusion (48) is formed of a material having a Young's modulus lower than that of the stator (8) other than the protrusion (48).
The compressor according to any one of claims 1 to 5. The stator (8) is manufactured by caulking a plurality of laminated steel plates at the positions of the protrusions (41, 48).
The compressor according to any one of claims 1 to 6. The stator (8) has a recess (43) formed between two adjacent protrusions (41, 48) on the outer peripheral surface thereof.
The compressor according to any one of claims 1 to 7.

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