JP4548411B2 - Compressor - Google Patents

Description

The present invention relates to compressors for example that have used motors Sutetako authors used in air conditioners and refrigerators compressor or the like.

  2. Description of the Related Art Conventionally, a motor used in a compressor includes a rotor and a stator disposed on the outer side in the radial direction of the rotor. The stator core of the stator bonds a plurality of stacked steel plates and the adjacent steel plates to each other. (See JP 2003-324869 A: Patent Document 1).

The varnish is composed of a main agent and a solvent. As the varnish, a varnish having a high concentration equivalent to that of the winding varnish is generally used. Specifically, the concentration of the main ingredient of the varnish is 20% to 25%.
JP 2003-324869 A

  However, in the stator core of the conventional motor, since the concentration of the main ingredient of the varnish is 20% to 25%, the amount of adhesion of the varnish to the steel plate increases, and it is necessary to wipe off the excess varnish. At the same time, waste dust used for wiping may adhere to the steel sheet.

  Further, the amount of the varnish adhering to the steel plate increases, and the adhesion of the varnish affects the inner and outer diameters of the stator core, so that the stator using the stator core needs to be resized or cut. became.

Then, the subject of this invention is providing the compressor which uses the stator core which can reduce the adhesion amount to the said steel plate of the said varnish, maintaining the mutual adhesion of the said adjacent steel plate.

In order to solve the above problems, the compressor of the present invention is:
A sealed container;
A compression element disposed in the sealed container;
A motor disposed in the sealed container and driving the compression element via a shaft;
With
The refrigerant in the sealed container is carbon dioxide,
The motor
A rotor,
A stator disposed radially outside the rotor;
Have
The stator is
A stator core;
A coil wound around the stator core;
Have
The stator core is
A plurality of laminated steel plates;
A varnish for adhering the steel plates adjacent to each other;
The concentration of the main ingredient of the varnish is 1% to 5%.

  Here, the said varnish consists of a main ingredient and a solvent. The main agent is, for example, an epoxy resin, and the solvent is, for example, xylene, butyl cellosolve, styrene, toluene, ethylbenzene, or the like. The density | concentration of the main ingredient of the said varnish is the weight% of the main ingredient with respect to a main ingredient and a solvent.

According to the compressor of the present invention, even if the concentration of the main ingredient of the varnish is lowered, the adjacent steel plates can be bonded securely and the rigidity of the stator core is maintained if the concentration of the main ingredient of the varnish is 1% or more. it can.

  And since the concentration of the main ingredient of the varnish is low, the amount of the varnish adhering to the steel sheet is reduced, and unnecessary wiping of the varnish becomes unnecessary, and waste of waste cloth used for wiping adheres to the steel sheet. Can be prevented.

  Further, since the amount of adhesion of the varnish to the steel plate is small, there is no influence on the inner diameter and outer diameter of the stator core due to the adhesion of the varnish, and the dimensional change or cutting of the stator using the stator core becomes unnecessary.

  Therefore, the adhesion amount of the varnish to the steel sheet can be reduced while maintaining the mutual adhesion of the adjacent steel sheets.

In addition , since the stator having the stator core is provided, there is no influence on the diameter of the stator due to varnish adhesion, and there is no need to change the dimensions of the stator. In addition, the dimensions of the rotor combined with the stator are changed. Is no longer necessary. Therefore, it is possible to combine a common rotor with a stator core that has undergone core varnishing and a stator core that has not undergone core varnishing.

  Further, the rigidity of the stator core can be maintained, and the vibration of the motor when the motor is operated can be reduced.

Further , since the motor is provided, there is no influence on the diameter of the stator due to adhesion of varnish, and it becomes unnecessary to change the dimensions of the stator and the rotor. Therefore, it is possible to combine a common rotor with a stator core that has undergone core varnishing and a stator core that has not undergone core varnishing.

  Moreover, the amount of extraction of the varnish into the refrigerant gas in the sealed container can be reduced, and clogging in the refrigeration system due to elution of the varnish can be prevented. In particular, when carbon dioxide is used as the refrigerant of the compressor, the high-low pressure difference and the temperature difference in the refrigeration system are larger than when other refrigerants are used. In the expansion process in the refrigeration system, when the degree of pressure or temperature decrease increases, the extract tends to precipitate. Therefore, the concentration of the varnish base agent is 1-5% with respect to the compressor using carbon dioxide as the refrigerant. Such a low concentration is particularly effective.

  Further, the rigidity of the stator core can be maintained, and the compressor vibration during the operation of the motor can be reduced.

According to the compressor of the present invention, since the concentration of the main agent of the varnish is 1% to 5%, the adhesion amount of the varnish to the steel plate is reduced while maintaining the mutual adhesion of the adjacent steel plates. it can.

Further, since being provided with the above-mentioned stator having an upper Symbol stator core, with size change of the stator and the rotor due to the varnish adhered is not necessary, it is possible to reduce the vibration of the motor can hold the rigidity of the stator core .

Further, is provided with the above SL motor, the stator by varnish deposition, along with the size change of the rotor and the closed container is not necessary, it is possible to reduce the vibration of the compressor can hold the rigidity of the stator core it can.

  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 disk-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 and a coil 520 wound around the stator core 510. In FIG. 3, the coil 520 is partially omitted.

  The stator core 510 is fitted into the closed container 1 by shrink fitting or the like. 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.

  As shown in FIG. 4, the stator core 510 has a plurality of stacked steel plates 15 and a varnish 16 that bonds the adjacent steel plates 15 together. All the steel plates 15 are fixed integrally by caulking, for example. The varnish 16 is at least between the adjacent steel plates 15. Specifically, the varnish 16 covers the entire surface of each steel plate 15.

  The varnish 16 is composed of a main agent and a solvent. The main agent is, for example, an epoxy resin. The solvent is, for example, xylene and butyl cellosolve, and the weight ratio of xylene and butyl cellosolve is 3: 1. The concentration of the main agent of the varnish 16, that is, the weight percent of the main agent relative to the main agent and the solvent is 1% to 5%.

  The manufacturing method of the stator core 510 will be described. The plurality of steel plates 15 are laminated, and the adjacent steel plates 15 are bonded to each other with the varnish 16. In addition, when laminating | stacking the said several steel plate 15, you may integrate the said adjacent steel plate 15 by crimping, for example. Further, when the adjacent steel plates 15 are bonded to each other with the varnish 16, for example, the plurality of stacked steel plates 15 are doubly attached to the varnish 16.

  FIG. 5 shows the relationship between the varnish concentration and the amount of change in the diameter dimension of the stator core. In FIG. 5, the horizontal axis represents the concentration [%] of the main agent of the varnish 16, and the vertical axis represents the amount of change [μm] in the diameter of the stator core 510.

  As can be seen from FIG. 5, as the varnish concentration increases, the amount of change in the diameter dimension of the stator core increases. When the varnish concentration is 5% or less, the amount of change in the diameter dimension of the stator core is within an allowable range to such an extent that the dimensional change or cutting of the stator core is not required. That is, since the varnish concentration is low, the adhesion amount of the varnish 16 to the steel plate 15 is reduced, and the diameter dimension of the stator core 510 due to the adhesion of the varnish 16 is not affected.

  Further, when the varnish concentration is 1% or more, noise due to vibration during operation of the motor 3 is well suppressed. That is, when the varnish concentration is 1% and when the varnish concentration is 20%, an equivalent noise suppression effect can be obtained. This is because when the varnish concentration is 1% or more, the adjacent steel plates 15 can be bonded to such an extent that they cannot be moved relative to each other, the rigidity of the stator core 510 can be maintained, and the vibration during the operation of the motor 3 can be reduced. is there.

  In the stator core 510 having the above-described configuration, even if the concentration of the main agent of the varnish 16 is reduced, the adjacent steel plates 15 can be reliably bonded if the concentration of the main agent of the varnish 16 is 1% or more. Can maintain rigidity.

  And since the density | concentration of the main ingredient of the said varnish 16 is low, while the adhesion amount to the said steel plate 15 of the said varnish 16 decreases, the wiping of the excess varnish 16 becomes unnecessary, and the waste of the waste used for wiping off, Adhering to the steel plate 15 can be prevented.

  Further, since the amount of adhesion of the varnish 16 to the steel plate 15 is small, there is no influence on the inner diameter and outer diameter of the stator core 510 due to the adhesion of the varnish 16, and the dimensional change or cutting of the stator 5 using the stator core 510 is not caused. No processing is required.

  Therefore, the adhesion amount of the varnish 16 to the steel plate 15 can be reduced while maintaining the mutual adhesion of the adjacent steel plates 15.

  On the other hand, if the concentration of the main agent of the varnish 16 is less than 1%, the adhesion of the adjacent steel plates 15 cannot be maintained, and the steel plates 15 are in an unstable state in which the steel plates 15 can be relatively moved. When the motor is operated, there is a problem that vibration and noise are generated in the motor 3 and the compressor in which the motor 3 is incorporated. On the other hand, when the concentration of the main agent of the varnish 16 exceeds 5%, the amount of the varnish 16 attached to the steel plate 15 increases, and the inner and outer diameters of the stator core 510 due to the attachment of the varnish 16 are affected. Therefore, it is necessary to change the dimensions of the stator 5 or to cut it.

  In addition, since the motor 3 having the above-described configuration includes the stator 5 having the stator core 510, there is no influence on the diameter of the stator 5 due to varnish adhesion, and there is no need to change the size of the stator 5 or to perform cutting. In addition, it is not necessary to change the dimensions of the rotor 6 combined with the stator 5. Further, the rigidity of the stator core 510 can be maintained, and the vibration of the motor 3 during the operation of the motor 3 can be reduced.

  Moreover, according to the compressor of the said structure, since the said motor 3 is provided, there is no influence on the diameter dimension of the said stator 5 by varnish adhesion, and the dimension change of the said stator 5 and the said rotor 6 becomes unnecessary. In addition, it is not necessary to change the dimensions of the sealed container 1. Moreover, the extraction amount of the varnish 16 into the refrigerant gas in the sealed container 1 can be reduced, and clogging in the refrigeration system due to the elution of the varnish 16 can be prevented. In particular, when carbon dioxide is used as the refrigerant of the compressor, the high-low pressure difference and the temperature difference in the refrigeration system are larger than when other refrigerants are used. In the expansion process in the refrigeration system, if the degree of decrease in pressure or temperature increases, the extract is likely to precipitate. Therefore, the concentration of the main agent of the varnish 16 is set to 1 to 5 with respect to the compressor using carbon dioxide as the refrigerant. It is particularly effective to make the concentration as low as%. Further, the rigidity of the stator core 510 can be maintained, and the compressor vibration during the operation of the motor 3 can be 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. Moreover, you may use the said motor 3 for fans other than a compressor.

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 an expanded sectional view of a stator core. It is a graph which shows the relationship between a varnish density | concentration and the variation | change_quantity of the diameter dimension of a stator core.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression element 3 Motor 5 Stator 510 Stator core 520 Coil 6 Rotor 12 Shaft 15 Steel plate 16 Varnish 21 Cylinder

Claims (1)

A sealed container (1);
A compression element (2) arranged in the sealed container (1);
A motor (3) disposed in the sealed container (1) and driving the compression element (2) via a shaft (12);
With
The refrigerant in the sealed container (1) is carbon dioxide,
The motor (3)
A rotor (6);
A stator (5) disposed radially outward of the rotor (6);
Have
The stator (5)
A stator core (510);
A coil (520) wound around the stator core (510);
Have
The stator core (510)
A plurality of laminated steel plates (15);
A varnish (16) for adhering the steel plates (15) adjacent to each other;
The compressor characterized in that the concentration of the main agent of the varnish (16) is 1% to 5%.

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