JP2008141805A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor which can uniformize the stress imposed on the outer peripheral surface of a stator core to reduce noises and vibration. <P>SOLUTION: The stator core 510 has an annular portion 511 and a plurality of teeth parts 512, projecting inside in the radial direction from the inner circumferential surface of the annular portion 511 and arranged in the circumferential direction at specified intervals. The outer circumferential surface 511a of the annular portion 511 is formed into a cylindrical surface, and the annular portion 511 is provided with a hole part 513 located outside in the radial direction of the teeth parts 512. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a compressor used in, for example, an air conditioner or a refrigerator.

  2. Description of the Related Art Conventionally, a compressor includes a sealed container, a compression element disposed in the sealed container, and a motor disposed in the sealed container and driving the compression element via a shaft. (See Japanese Patent No. 3586145: Patent Document 1).

The motor has a rotor and a stator disposed on the outer side in the radial direction of the rotor. The stator includes a stator core and a coil wound around the stator core. The outer peripheral surface of the stator core has a core cut as a passage through which refrigerant gas and lubricating oil are passed. The core cut is constituted by a recess formed by cutting out the outer peripheral surface of the stator core from one end surface to the other end surface of the stator core.
Japanese Patent No. 3586145

  However, since the conventional compressor has a core cut on the outer peripheral surface of the stator core, the contact surface pressure between the outer peripheral surface of the stator core and the inner peripheral surface of the sealed container becomes non-uniform. For this reason, the stress on the outer peripheral surface of the stator core becomes non-uniform, affecting the noise and vibration of the compressor.

  Accordingly, an object of the present invention is to provide a compressor capable of reducing noise and vibration by making the stress on the outer peripheral surface of the stator core uniform.

In order to solve the above problems, the compressor of the present invention is:
An airtight container, a compression element disposed in the airtight container, and a motor disposed in the airtight container and driving the compression element via a shaft,
The motor has a rotor and a stator arranged on the outer side in the radial direction of the rotor,
The stator has a stator core and a coil wound around the stator core,
The stator core includes an annular portion, and a plurality of teeth portions that protrude radially inward from the inner peripheral surface of the annular portion and are arranged at predetermined intervals in the circumferential direction,
The outer peripheral surface of the annular portion is formed in a cylindrical surface,
The annular portion is characterized by being provided with a hole located on the radially outer side of the tooth portion.

  According to the compressor of the present invention, since the outer peripheral surface of the annular portion is formed in a cylindrical surface, the outer peripheral surface of the stator core does not have a core cut as in the prior art, and the outer peripheral surface of the stator core The contact surface pressure with the inner peripheral surface of the sealed container becomes uniform, and the stress on the outer peripheral surface of the stator core can be made uniform. Moreover, the rigidity of the part which contacts the said airtight container in the outer peripheral surface of the said stator core can be improved. Therefore, noise and vibration of the compressor can be reduced.

  Further, since the contact surface of the stator core with the inner peripheral surface of the sealed container can be increased on the outer peripheral surface of the stator core, the stator core can absorb the distortion at the time of shrink fitting with a larger area than conventional, and the iron loss is reduced. The motor efficiency can be improved.

  Moreover, since the hole located in the radial direction outer side of the said teeth part is provided in the said annular part, this hole can be made into the channel | path which lets refrigerant gas and lubricating oil pass instead of the conventional core cut.

  In one embodiment of the compressor, the stator core includes a plurality of steel plates that are stacked and crimped together by a crimping portion, and the crimping portion is located in the vicinity of the hole.

  According to the compressor of this embodiment, the caulking part is located in the vicinity of the hole, so the caulking part can be located in a part having a low magnetic flux density, and iron loss is reduced. Motor efficiency does not decrease.

  Moreover, in the compressor of one Embodiment, the said crimping | crimped part is located on the said cyclic | annular part and the radial inside of the said hole.

  According to the compressor of this embodiment, the caulking portion is located on the annular portion and on the radially inner side of the hole portion, so that the caulking portion is at a portion having a lower magnetic flux density. It can be positioned, iron loss is reduced, and motor efficiency does not decrease.

  Moreover, in the compressor of one Embodiment, the refrigerant | coolant in the said airtight container is a carbon dioxide.

  According to the compressor of this embodiment, when carbon dioxide is used as the refrigerant in the sealed container, the design pressure of the compressor is higher than when other refrigerants are used. In consideration of this, it is necessary to increase the shrinkage allowance of the stator core, but on the other hand, the distortion at the time of shrinkage fitting of the stator core also increases. Therefore, for a compressor using carbon dioxide as a refrigerant, forming the outer peripheral surface of the annular portion of the stator core in a cylindrical surface is particularly effective for absorbing distortion during shrink fitting of the stator core. It becomes.

  According to the compressor of the present invention, since the outer peripheral surface of the annular portion of the stator core is formed in a cylindrical surface, the stress on the outer peripheral surface of the stator core can be made uniform to reduce noise and vibration.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a longitudinal sectional view showing an embodiment of the compressor of the present invention. The compressor includes a sealed container 1, a compression element 2 disposed in the sealed container 1, and a motor 3 disposed in the sealed container 1 and driving the compression element 2 via a shaft 12. ing.

  This compressor is a so-called vertical high-pressure dome type rotary compressor, in which the compression element 2 is placed down and the motor 3 is placed up in the sealed container 1. The rotor 6 of the motor 3 drives the compression element 2 via the shaft 12.

  The compression element 2 sucks refrigerant gas from the accumulator 10 through the suction pipe 11. The refrigerant gas is obtained by controlling a condenser, an expansion mechanism, and an evaporator (not shown) that constitute an air conditioner as an example of a refrigeration system together with the compressor. This refrigerant is, for example, carbon dioxide, HFC such as HC or R410A, or HCFC such as R22.

  The compressor discharges the compressed high-temperature and high-pressure refrigerant gas from the compression element 2 to fill the inside of the hermetic container 1, and passes the gap between the stator 5 and the rotor 6 of the motor 3 through the motor. 3 is cooled, and then discharged from the discharge pipe 13 provided on the upper side of the motor 3 to the outside.

  An oil reservoir 9 in which lubricating oil is stored is formed in the lower portion of the high-pressure region in the closed container 1. This lubricating oil moves from the oil reservoir portion 9 through an oil passage (not shown) provided in the shaft 12 to a sliding portion such as the bearing of the compression element 2 or the motor 3. Lubricate the sliding part. This lubricating oil is, for example, a polyalkylene glycol oil (such as polyethylene glycol or polypropylene glycol), an ether oil, an ester oil, or a mineral oil.

  The compression element 2 includes a cylinder 21 that is attached to the inner surface of the sealed container 1, and an upper end plate member 50 and a lower end plate member 60 that are attached to upper and lower open ends of the cylinder 21. Prepare. A cylinder chamber 22 is formed by the cylinder 21, the upper end plate member 50, and the lower end plate member 60.

  The upper end plate member 50 includes a disk-shaped main body 51 and a boss 52 provided upward in the center of the main body 51. The main body 51 and the boss 52 are inserted through the shaft 12.

  The main body 51 is provided with a discharge port 51 a communicating with the cylinder chamber 22. A discharge valve 31 is attached to the main body 51 so as to be located on the opposite side of the main body 51 from the cylinder 21. The discharge valve 31 is, for example, a reed valve, and opens and closes the discharge port 51a.

  A cup-type muffler cover 40 is attached to the main body 51 so as to cover the discharge valve 31 on the side opposite to the cylinder 21. The muffler cover 40 is fixed to the main body 51 by a fixing member 35 (such as a bolt). The muffler cover 40 is inserted through the boss portion 52.

  A muffler chamber 42 is formed by the muffler cover 40 and the upper end plate member 50. The muffler chamber 42 and the cylinder chamber 22 communicate with each other via the discharge port 51a.

  The muffler cover 40 has a hole 43. The hole 43 communicates the muffler chamber 42 with the outside of the muffler cover 40.

  The lower end plate member 60 includes a disc-shaped main body portion 61 and a boss portion 62 provided downward in the center of the main body portion 61. The main body 61 and the boss 62 are inserted through the shaft 12.

  In short, one end of the shaft 12 is supported by the upper end plate member 50 and the lower end plate member 60. That is, the shaft 12 is cantilevered. One end portion (support end side) of the shaft 12 enters the cylinder chamber 22.

  An eccentric pin 26 is provided on the support end side of the shaft 12 so as to be positioned in the cylinder chamber 22 on the compression element 2 side. The eccentric pin 26 is fitted to the roller 27. The roller 27 is disposed so as to be able to revolve in the cylinder chamber 22, and performs a compression action by the revolving motion of the roller 27.

  In other words, one end of the shaft 12 is supported by the housing 7 of the compression element 2 on both sides of the eccentric pin 26. The housing 7 includes the upper end plate member 50 and the lower end plate member 60.

  Next, the compression action of the cylinder chamber 22 will be described.

  As shown in FIG. 2, the cylinder chamber 22 is partitioned by a blade 28 provided integrally with the roller 27. That is, the chamber on the right side of the blade 28 has the suction pipe 11 opened on the inner surface of the cylinder chamber 22 to form a suction chamber (low pressure chamber) 22a. On the other hand, in the chamber on the left side of the blade 28, the discharge port 51a (shown in FIG. 1) opens on the inner surface of the cylinder chamber 22 to form a discharge chamber (high pressure chamber) 22b.

  Semi-cylindrical bushes 25, 25 are in close contact with both surfaces of the blade 28 for sealing. The blade 28 and the bushes 25, 25 are lubricated with the lubricating oil.

  Then, the eccentric pin 26 rotates eccentrically with the shaft 12, and the roller 27 fitted to the eccentric pin 26 contacts the outer peripheral surface of the roller 27 with the inner peripheral surface of the cylinder chamber 22, Revolve.

  As the roller 27 revolves in the cylinder chamber 22, the blade 28 advances and retreats with both side surfaces of the blade 28 being held by the bushes 25, 25. Then, a low-pressure refrigerant gas is sucked into the suction chamber 22a from the suction pipe 11, compressed in the discharge chamber 22b to a high pressure, and then a high-pressure refrigerant gas is supplied from the discharge port 51a (shown in FIG. 1). Discharge.

  Thereafter, as shown in FIG. 1, the refrigerant gas discharged from the discharge port 51 a is discharged to the outside of the muffler cover 40 via the muffler chamber 42.

  As shown in FIGS. 1 and 3, the motor 3 includes the rotor 6 and the stator 5 disposed on the radially outer side of the rotor 6 via an air gap.

  The rotor 6 includes a rotor body 610 and a magnet 620 embedded in the rotor body 610. The rotor body 610 has a cylindrical shape, and is made of, for example, laminated electromagnetic steel plates. The shaft 12 is attached to the central hole of the rotor body 610. The magnet 620 is a flat permanent magnet. The six magnets 620 are arranged at center angles at equal intervals in the circumferential direction of the rotor body 610.

  The stator 5 includes a stator core 510, insulators 530 disposed on both end surfaces of the stator core 510 in the axis 510a direction, and a coil 520 wound around the stator core 510 and the insulator 530 together. In FIG. 3, the coil 520 is partially omitted, and the insulator 530 is omitted.

  The stator core 510 is composed of a plurality of laminated steel plates. The stator core 510 includes an annular portion 511 and nine teeth portions 512 that protrude radially inward from the inner circumferential surface of the annular portion 511 and that are arranged at equal intervals (as an example of a predetermined interval) in the circumferential direction. Have.

  The coil 520 is a so-called concentrated winding that is wound around each of the tooth portions 512 and is not wound around the plurality of tooth portions 512. The motor 3 has a so-called 6 pole 9 slot. The rotor 6 is rotated together with the shaft 12 by an electromagnetic force generated in the stator 5 by passing a current through the coil 520.

  As shown in FIGS. 3 and 4, the outer peripheral surface 511a of the annular portion 511 of the stator core 510 is formed in a cylindrical surface. The outer peripheral surface 511a of the annular portion 511 is in contact with the inner peripheral surface of the sealed container 1 over the entire periphery. The stator core 510 is attached to the sealed container 1 by, for example, shrink fitting.

  The annular portion 511 is provided with a hole portion 513 located on the radially outer side of the tooth portion 512. The hole portion 513 is provided so as to correspond to at least one of the tooth portions 512.

  The hole 513 is formed to penetrate from one end surface of the stator core 510 to the other end surface. The hole 513 is formed long in the circumferential direction when viewed from the axis 510 a direction of the stator core 510. The hole 513 is used as a passage through which refrigerant gas or lubricating oil passes.

  As shown in FIG. 4, the plurality of steel plates constituting the stator core 510 are caulked to each other by a caulking portion 514. The caulking portion 514 is located in the vicinity of the hole portion 513.

  Specifically, the caulking portion 514 is located on the annular portion 511 and on the radially inner side of the hole portion 513. The caulking portion 514 is provided on the radially outer side of each of the tooth portions 512.

  According to the compressor having the above-described configuration, the outer peripheral surface 511a of the annular portion 511 is formed in a cylindrical surface. Therefore, the outer peripheral surface 511a of the stator core 510 does not have a core cut as in the related art, and the stator core 510 The contact surface pressure with the inner peripheral surface of the closed container 1 becomes uniform on the outer peripheral surface 511a, and the stress on the outer peripheral surface 511a of the stator core 510 can be made uniform. In addition, the rigidity of the portion of the outer peripheral surface 511a of the stator core 510 that contacts the sealed container 1 can be improved. Therefore, noise and vibration of the compressor can be reduced.

  Further, since the contact surface of the outer peripheral surface 511a of the stator core 510 with the inner peripheral surface of the hermetic container 1 can be increased, the stator core 510 can absorb distortion during shrink fitting with a larger area than conventional ones, and iron Loss is reduced and motor efficiency can be improved.

  In particular, when carbon dioxide is used as the refrigerant in the sealed container 1, the design pressure of the compressor becomes higher than when other refrigerants are used. Although it is necessary to increase the shrinkage allowance of 510, on the other hand, the distortion at the time of shrink fitting of the stator core 510 is also increased. Therefore, for the compressor using carbon dioxide as the refrigerant, forming the outer peripheral surface 511a of the annular portion 511 of the stator core 510 on the cylindrical surface is to absorb distortion during shrink fitting of the stator core 510. On the other hand, it is particularly effective.

  Further, since the annular portion 511 is provided with a hole 513 located on the radially outer side of the tooth portion 512, the refrigerant gas or lubricating oil is passed through the hole 513 instead of the conventional core cut. Can be a passage.

  Further, since the hole portion 513 is located on the radially outer side of the tooth portion 512, the hole portion 513 obstructs the magnetic path as compared with the case where the hole portion 513 is provided between the adjacent tooth portions 512. Therefore, the iron loss is reduced and the motor efficiency is not lowered.

  Moreover, since the said crimping | crimped part 514 is located in the vicinity of the said hole part 513, the said crimping | crimped part 514 can be located in a part with a low magnetic flux density, an iron loss is reduced, and motor efficiency does not fall. .

  In addition, since the crimping portion 514 is located on the annular portion 511 and on the radially inner side of the hole portion 513, the crimping portion 514 can be located in a portion having a lower magnetic flux density. Iron loss is reduced and motor efficiency does not decrease.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the compression element 2 may be a rotary type in which a roller and a blade are separate bodies. As the compression element 2, a scroll type or a reciprocating type may be used in addition to the rotary type. Further, the compression element 2 may be a two-cylinder type having two cylinder chambers. The compression element 2 may be arranged on the upper side and the motor 3 may be arranged on the lower side.

  Further, the hole portion 513 may be provided corresponding to all the tooth portions 512. The shape and quantity of the hole 513 can be freely changed. The caulking portion 514 may be provided in the circumferential direction of the hole portion 513 or in the tooth portion 512.

It is a longitudinal section showing one embodiment of the compressor of the present invention. It is a top view of the principal part of a compressor. It is a cross-sectional view near the motor of the compressor. It is a principal part enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression element 3 Motor 5 Stator 510 Stator core 510a Shaft 511 Annular part 511a Outer peripheral surface 512 Teeth part 513 Hole part 514 Caulking part 520 Coil 530 Insulator 6 Rotor 12 Shaft 21 Cylinder 50 Upper end plate member 60 Lower end plate member 60 Plate member

Claims (4)

An airtight container (1), a compression element (2) disposed in the airtight container (1), and the compression element (2) disposed in the airtight container (1) through the shaft (12). And a motor (3) for driving
The motor (3) includes a rotor (6) and a stator (5) disposed on the outer side in the radial direction of the rotor (6).
The stator (5) includes a stator core (510) and a coil (520) wound around the stator core (510).
The stator core (510) includes an annular portion (511) and a plurality of teeth portions (512) protruding radially inward from the inner peripheral surface of the annular portion (511) and arranged at predetermined intervals in the circumferential direction. Have
The outer peripheral surface (511a) of the annular portion (511) is formed in a cylindrical surface,
The compressor characterized in that the annular part (511) is provided with a hole part (513) located on the radially outer side of the tooth part (512). The compressor according to claim 1,
The stator core (510) has a plurality of steel plates that are stacked and crimped to each other by a crimping portion (514), and the crimping portion (514) is located in the vicinity of the hole (513). Compressor characterized by. The compressor according to claim 2, wherein
The compressor characterized in that the crimping part (514) is located on the annular part (511) and on the radially inner side of the hole part (513). The compressor according to any one of claims 1 to 3,
The compressor characterized in that the refrigerant in the sealed container (1) is carbon dioxide.

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