JP2008169743A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor enabling sure attachment of a stator core to a hermetic vessel while preventing deformation of the stator core due to attachment to the hermetic vessel, improving motor efficiency and reducing noise and vibration. <P>SOLUTION: An irregular structure 70 repeating irregularity in a circumference direction is provided on an inner circumference surface 15 of the hermetic vessel 1. The irregular structure 70 is formed with corresponding to a shape of an outer circumference surface 515 of the stator core 510 and is attached on the outer circumference surface 515 of the stator core 510. <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 Laid-Open No. 2001-304123: 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, and the stator core is attached to a smooth inner surface of the sealed container.
JP 2001-304123 A

  However, in the conventional compressor, since the stator core is attached to the smooth inner surface of the sealed container, an interference allowance is provided on the outer peripheral surface of the stator core, and the stator core is placed on the inner surface of the sealed container. It was necessary to fix by interference fitting such as shrink fitting.

  When the interference fit of the stator core is increased and the strength of the interference fit of the stator core is increased, distortion occurs in the stator core, the iron loss due to this distortion increases, and the motor efficiency decreases.

  On the other hand, when the interference fit of the stator core is reduced and the strength of the interference fit of the stator core is reduced, the stator core moves with respect to the sealed container, which affects the noise and vibration of the compressor.

  Accordingly, an object of the present invention is to make it possible to reliably attach the stator core to the sealed container while preventing the stator core from being deformed to the sealed container, thereby improving motor efficiency and reducing noise and vibration. Is to provide a machine.

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 inner peripheral surface of the closed container is provided with an uneven structure having at least one set of unevenness in the circumferential direction,
The uneven structure is formed corresponding to the shape of the outer peripheral surface of the stator core, and is characterized in that the outer peripheral surface of the stator core is attached.

  According to the compressor of the present invention, the inner peripheral surface of the sealed container is provided with an uneven structure that is formed corresponding to the shape of the outer peripheral surface of the stator core and to which the outer peripheral surface of the stator core is attached. The outer peripheral surface of the stator core is tightly fitted by an uneven structure on the inner peripheral surface of the sealed container.

  Therefore, even if the interference fit provided on the outer peripheral surface of the stator core is reduced, the stator core can be securely fixed to the sealed container, so that distortion of the stator core when the stator core is attached to the sealed container is suppressed. Thus, iron loss due to distortion can be reduced and motor efficiency can be improved. In addition, since the stator core can be securely fixed to the sealed container, movement of the stator core relative to the sealed container can be suppressed, and noise and vibration of the compressor can be reduced. Furthermore, it is not necessary to make all the unevenness interference fit constant, and by controlling the interference fit allowance of each unevenness, or by controlling within the interference fit of one unevenness, the noise is positively This makes it possible to control the frequency effective for reducing noise and vibration, and more effectively reduce noise and vibration of the compressor.

  Moreover, in the compressor of one Embodiment, the said airtight container is produced by deform | transforming the flat plate provided with the said uneven structure into a cross-sectional cylinder shape.

  According to the compressor of this embodiment, since the closed container is formed by deforming the flat plate provided with the uneven structure into a cylindrical cross section, the processing cost of the closed container can be reduced. That is, since it can process into the said uneven structure in the state of the said flat plate, a process becomes easy.

  Moreover, in the compressor of one Embodiment, the said uneven structure of the said airtight container positions the said stator core in at least one direction of an axial direction or the circumferential direction.

  According to the compressor of this embodiment, the concavo-convex structure of the sealed container positions the stator core in at least one direction of the axial direction or the circumferential direction, and therefore, at least one of the axial direction or the circumferential direction of the stator core. Directional movement can be reliably suppressed.

  Moreover, in the compressor of one Embodiment, the buffer member is pinched | interposed between the said airtight container and the said stator core.

  Here, as the buffer member, for example, a material having a higher attenuation coefficient than the material of the sealed container is used. Examples of the material of the buffer member include, besides metal and rubber, a resin mold material having an oligomer content of 1.5 wt or less, and a resin material such as polyester used for motor insulation.

  According to the compressor of this embodiment, since the buffer member is sandwiched between the sealed container and the stator core, the buffer member can absorb the vibration of the stator core, and the compressor vibration and noise can be absorbed. Can be more reliably reduced.

  According to the compressor of the present invention, the inner peripheral surface of the sealed container is provided with the concavo-convex structure formed corresponding to the shape of the outer peripheral surface of the stator core and attached to the outer peripheral surface of the stator core. Therefore, the stator core can be securely attached to the sealed container while preventing deformation of the stator core to the sealed container, and the motor efficiency can be improved and the noise and vibration of the compressor can be reduced.

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

(First embodiment)
FIG. 1 is a longitudinal sectional view showing a first embodiment of a compressor according to the present invention. The compressor includes a hermetic container 1, a compression element 2 disposed in the hermetic container 1, and a motor 3 disposed in the hermetic 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. The lubricating oil moves from the oil reservoir 9 through an oil passage (not shown) provided in the shaft 12 to the sliding portion of the compression element 2 to lubricate the sliding portion. This lubricating oil is, for example, a polyalkylene glycol oil (such as polyethylene glycol or polypropylene glycol), an alkylbenzene oil, 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 is fixed to the inner peripheral surface 15 of the sealed container 1 by an interference fit such as shrink fitting. The stator core 510 has an annular portion 511 and nine teeth 512 that protrude radially inward from the inner peripheral surface of the annular portion 511 and are arranged at equal intervals in the circumferential direction.

  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.

  The insulator 530 is sandwiched between the stator core 510 and the coil 520 to insulate the stator core 510 from the coil 520.

  As shown in FIGS. 3 and 4, the inner peripheral surface 15 of the sealed container 1 is provided with a concavo-convex structure 70 that repeats the concavo-convex in the circumferential direction. The uneven structure 70 is formed corresponding to the shape of the outer peripheral surface 515 of the stator core 510, and the outer peripheral surface 515 of the stator core 510 is attached thereto.

  The outer peripheral surface 515 of the stator core 510 has a protrusion 516 and a notch 517. The projecting portion 516 is a portion including the maximum diameter of the stator core 510 and corresponds to an interference fit allowance that is tightly fitted to the inner peripheral surface 15 of the sealed container 1. The notch 517 is a core cut and serves as a passage for refrigerant gas and lubricating oil.

  The concavo-convex structure 70 has a concave portion 71 and a convex portion 72. The protrusions 516 are fitted in the recesses 71 correspondingly. The depth of the recess 71 is, for example, 30 μm to 200 μm. The notches 517 are fitted into the convex portions 72 correspondingly. That is, the outer peripheral surface 515 of the stator core 510 is tightly fitted to the concave-convex structure 70 of the inner peripheral surface 15 of the sealed container 1.

  As shown in the developed view on the inner peripheral side of the sealed container in FIG. 5, the recesses 71 and the protrusions 72 are alternately arranged along the circumferential direction of the sealed container 1. By changing the shape of the recess 71 and the interval between the adjacent recesses 71, the contact point with the stator core 510 is changed, and the frequency generated by the vibration of the motor 3 is controlled to reduce the noise and vibration of the compressor. It can be further reduced. A length L of the recessed portion 71 in the axial direction of the sealed container coincides with a length of the stator core 510 in the direction of the axis 510a. And the said uneven structure 70 of the said airtight container 1 positions the said stator core 510 in the said shaft 510a direction and the circumferential direction.

  Next, a method for producing the sealed container 1 will be described.

  As shown in FIG. 6A, the concave-convex structure 70 is formed on one surface of the flat plate 16 by forming the concave portions 71 and the convex portions 72 corresponding to the shape of the outer peripheral surface 515 of the stator core 510. For example, the concave-convex structure 70 is formed by forming the concave portion 71 on one surface of the flat plate 16 by pressing.

  And the said flat plate 16 provided with the said uneven structure 70 is rounded so that one surface of the said flat plate 16 may be located in an inner surface side, is deform | transformed into a cross-sectional cylinder shape, and both ends of the said flat plate 16 are welded. As shown in FIG. 6B, the sealed container 1 is prepared.

  According to the compressor having the above configuration, since the uneven structure 70 is provided on the inner peripheral surface 15 of the sealed container 1, the outer peripheral surface 515 of the stator core 510 is the inner peripheral surface 15 of the sealed container 1. The concavo-convex structure 70 is fitted with an interference fit.

  Accordingly, even if the interference fit provided on the outer peripheral surface 515 of the stator core 510 is reduced, the stator core 510 can be securely fixed to the sealed container 1, so that when the stator core 510 is attached to the sealed container 1, The distortion of the stator core 510 can be suppressed, the iron loss due to the distortion can be reduced, and the motor efficiency can be improved. Further, since the stator core 510 can be reliably fixed to the sealed container 1, the movement of the stator core 510 relative to the sealed container 1 can be suppressed, and the noise and vibration of the compressor can be reduced. Furthermore, it is not necessary to make all the unevenness interference fit constant, and by controlling the interference fit allowance of each unevenness, or by controlling within the interference fit of one unevenness, the noise is positively This makes it possible to control the frequency effective for reducing noise and vibration, and more effectively reduce noise and vibration of the compressor.

  In short, the stator core 510 can be reliably attached to the sealed container 1 while preventing the stator core 510 from being deformed to the sealed container 1, thereby improving motor efficiency and reducing compressor noise and vibration. .

  Moreover, since the said airtight container 1 is produced by deform | transforming the said flat plate 16 in which the said uneven structure 70 was provided in a cross-sectional cylinder shape, the processing cost of the said airtight container 1 can be reduced. That is, the concavo-convex structure 70 can be processed in the state of the flat plate 16, and the processing becomes easy.

  Further, since the concave-convex structure 70 of the sealed container 1 positions the stator core 510 in the direction of the axis 510a and the circumferential direction, the movement of the stator core 510 in the direction of the axis 510a and the circumferential direction can be reliably suppressed.

(Second Embodiment)
FIG. 7 shows a second embodiment of the compressor of the present invention. The difference from the first embodiment shown in FIG. 4 will be described. In the second embodiment, the buffer member 8 is sandwiched between the sealed container 1 and the stator core 510.

  The buffer member 8 is made of a material having a higher attenuation coefficient than the material of the sealed container 1. As the material of the buffer member 8, for example, a resin such as polyester, rubber, metal, a resin mold material having an oligomer content of 1.5 wt or less, or a resin material such as polyester used for motor insulation or the like is used.

  Therefore, the vibration of the stator core 510 can be absorbed by the buffer member 8, and the vibration and noise of the compressor can be further reliably reduced.

  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.

  The concave-convex structure 70 of the hermetic container 1 only needs to position the stator core 510 in at least one direction of the axis 510a or the circumferential direction, and at least one of the stator core 510 in the axis 510a direction or the circumferential direction. Directional movement can be reliably suppressed.

  Moreover, you may make it produce the said airtight container 1 by providing the said uneven structure 70 in the state of a cross-sectional cylinder shape. Further, the shape and quantity of the concave portion 71 and the convex portion 72 may be provided corresponding to the shape of the outer peripheral surface 515 of the stator core 510. Further, the concavo-convex structure 70 may be formed by providing the convex portion 72 on the flat plate 16.

  The concavo-convex structure may be a concavo-convex structure having at least one set of concavo-convex in the circumferential direction. Further, the concavo-convex structure may be formed by fixing the stator core 510 to the sealed container 1 by shrinking or press fitting.

It is a longitudinal section showing a 1st embodiment of a 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 an enlarged view of the part A of FIG. It is an expanded view of the inner peripheral side of a sealed container. It is a 1st process drawing explaining the creation method of an airtight container. It is a 2nd process drawing explaining the creation method of an airtight container. It is a principal part expanded sectional view which shows 2nd Embodiment of the compressor of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing container 2 Compression element 3 Motor 5 Stator 510 Stator core 510a Shaft 511 Annular part 512 Teeth part 515 Outer peripheral surface 516 Protrusion part 517 Notch part 520 Coil 530 Insulator 6 Rotor 8 Buffer member 12 Shaft 12a Rotating shaft 15 16 Flat plate 21 Cylinder 50 Upper end plate member 60 Lower end plate member 70 Concave and convex structure 71 Concave portion 72 Convex portion

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) has a stator core (510) and a coil (520) wound around the stator core (510),
The inner peripheral surface (15) of the sealed container (1) is provided with an uneven structure (70) having at least one set of unevenness in the circumferential direction,
The concavo-convex structure (70) is formed corresponding to the shape of the outer peripheral surface (515) of the stator core (510), and the outer peripheral surface (515) of the stator core (510) is attached thereto. Compressor. The compressor according to claim 1,
The compressor, wherein the sealed container (1) is formed by deforming a flat plate (16) provided with the concavo-convex structure (70) into a cylindrical cross section. The compressor according to claim 1,
The compressor according to claim 1, wherein the concavo-convex structure (70) of the hermetic container (1) positions the stator core (510) in at least one direction of an axial (510a) direction or a circumferential direction. The compressor according to claim 1,
A compressor characterized in that a buffer member (8) is sandwiched between the hermetic container (1) and the stator core (510).

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