JP2007100544A - Compressor for storing motor-driven element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable compressor stably operable over a long period by preventing failure of shrinkage fit of a stator and failure of a gap between the stator and a rotor while restraining vibration and noise even if carbon dioxide is used as a refrigerant. <P>SOLUTION: This compressor 10 is constituted so that a compression element 18 and a motor-driven element 14 for driving the compression element 18 are stored in a sealed vessel 12, and the introduced refrigerant is compressed by the compression element 18, and the compressed refrigerant is delivered in the sealed vessel 12, or the refrigerant delivered in the sealed vessel 12 is also compressed by the compression element 18, and is delivered outside the sealed vessel 12; and solves the problem by fixing the motor-driven element 14 inside an installed motor-driven element fixing part 1 by installing the motor-driven element fixing part 1 having an outer diameter smaller than an inner diameter of the sealed vessel 12 and having an inner diameter capable of fixing the motor-driven element 14 inside, in a supporting fixing member 54 for supporting and fixing the compression element 18 in the sealed vessel 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a compressor that houses an electric element, and more particularly to a compressor that houses an electric element that has low noise and vibration, and that has high reliability, even among natural refrigerants. .

Conventionally, chlorofluorocarbon (R11, R12, R134a, etc.) is generally used as a refrigerant in the refrigeration cycle. However, when CFCs are released into the atmosphere, they have problems such as a large warming effect and ozone layer destruction. For this reason, in recent years, other natural refrigerants having little influence on the environment, such as oxygen (O ₂ ), carbon dioxide (CO ₂ ), hydrocarbon (HC), ammonia (NH ₃ ), and water (H ₂ O), are used. Research on use as a refrigerant has been conducted. Among these natural refrigerants, oxygen and water are low in pressure and difficult to use as refrigerants in the refrigeration cycle, and ammonia and hydrocarbons are flammable, and therefore have a problem that they are difficult to handle. For this reason, an apparatus using a transcritical refrigerant cycle that uses carbon dioxide and operates on the high pressure side as a supercritical pressure has been proposed (see Patent Document 1).

Conventionally, this type of compressor has a stator that is tightly fitted tightly in an annular shape by shrink fitting along an inner peripheral surface of a predetermined position in an upper space in a sealed container made of a cylindrical iron-based material, An electric element as a drive element having a rotor inserted and installed at a slight interval inside the stator and a compression element that is driven by this electric element to compress the refrigerant are accommodated to start the electric element Then, the compression element is driven, and the refrigerant introduced into the compression element is compressed and discharged.
Japanese Patent Laid-Open No. 10-19401

However, the stator of the electric element is directly shrink fitted or spot welded along the inner peripheral surface of the sealed container, or the stator of the electric element is tightly attached. If it is housed in a suspended manner, vibrations of the electric elements and the like are easily transmitted to the sealed container, and noise is generated.
Then, especially in the case of using carbon dioxide as the refrigerant, the refrigerant pressure reaches even about 150 kg / cm ² G on the high pressure side, the low-pressure side of about 30-40 kg / cm ² G, and the like temperature reaches about 130 ° C., The refrigeration cycle that uses carbon dioxide as the refrigerant has a higher refrigerant pressure and temperature than chlorofluorocarbon, and as described above, the stator is directly shrink-fitted into the sealed container or spot welded. If this is done, vibration and noise will increase, and shrinkage shrinkage of the stator will occur and gaps between the stator and rotor will become nonuniform, resulting in compressor malfunction. Or a serious problem such as loss of reliability.

  The object of the present invention is to solve the conventional problems and to suppress vibrations and noises even when carbon dioxide is used as a refrigerant, and to prevent a shrink fit of the stator and a gap between the stator and the rotor. Thus, a highly reliable compressor capable of stable operation over a long period of time is provided.

In order to solve the above-mentioned problems, a compressor storing an electric element according to claim 1 of the present invention stores a compression element and an electric element for driving the compression element in a hermetic container, and introduces the introduced refrigerant. In the compressor that compresses with the compression element and discharges the compressed refrigerant into the sealed container, or further compresses the refrigerant discharged into the sealed container with the compression element and discharges it outside the sealed container.
An electric element fixing component having an outer diameter smaller than an inner diameter of the hermetic container and having an inner diameter capable of fixing the electric element inside is attached to a support fixing member that supports and fixes the compression element in the hermetic container. Furthermore, the electric element is fixed inside the electric element fixing part.

  The compressor containing the electric element according to claim 2 of the present invention is characterized in that, in the compressor according to claim 1, the electric element fixing component is attached to the support fixing member via a cushioning material. .

  According to a third aspect of the present invention, there is provided a compressor storing the electric element according to the first or second aspect, wherein the refrigerant is carbon dioxide.

A compressor storing the electric element according to claim 1 of the present invention stores the compression element and the electric element for driving the compression element in a sealed container, and compresses the introduced refrigerant with the compression element. In the compressor that discharges the compressed refrigerant into the sealed container, or further compresses the refrigerant discharged into the sealed container with the compression element and discharges it outside the sealed container.
An electric element fixing component having an outer diameter smaller than an inner diameter of the hermetic container and having an inner diameter capable of fixing the electric element inside is attached to a support fixing member that supports and fixes the compression element in the hermetic container. In addition, the electric element is configured to be fixed inside the electric element fixing part,
Without directly shrink fitting or spot welding the electric element in the sealed container, the electric element fixing part is attached to the support fixing member such as a cylinder or a main frame, and the electric element fixing part is shrink-fitted inside the attached electric element fixing part. Or because the electric element is fixed by spot welding or the like, vibration of the electric element or the like is not directly transmitted to the sealed container, and as a result, even if carbon dioxide is used as a refrigerant, vibration and noise can be suppressed, Since no excessive force is applied to the stator stack and stator coil, the stack does not deform or collapse, and the insulation of the winding of the stator coil is not impaired. The proper spacing is maintained, and it is possible to improve the motor efficiency by suppressing the shrink fit of the stator and the gap between the stator and the rotor. It exhibits the remarkable effect that.

According to a second aspect of the present invention, there is provided a compressor storing the electric element according to the first aspect, wherein the electric element fixing component is attached to the support fixing member via a cushioning material. Is,
Since the electric element fixing component is attached to the support fixing member through a cushioning material such as a synthetic rubber or a spring, vibration and noise can be further suppressed, and the shrinkage fitting failure of the stator and the gap between the stator and the rotor can be suppressed. Defects can be prevented, stable operation can be performed for a longer period of time, and a further remarkable effect of higher reliability can be achieved.

A compressor containing the electric element according to claim 3 of the present invention is characterized in that, in the compressor according to claim 1 or 2, the refrigerant is carbon dioxide,
When the refrigerant is carbon dioxide, a higher refrigerant pressure and temperature are exhibited during operation than conventional fluorocarbon refrigerants. However, even if carbon dioxide, which is a natural refrigerant, is used, vibration and noise can be suppressed, and the stator shrinkage failure and the step can be suppressed. -Suppresses the gap defect between the rotor and rotor, provides stable operation over a long period of time, and has the further remarkable effect that reliability is not impaired.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional explanatory view illustrating an embodiment of a compressor of the present invention.
In FIG. 1, reference numeral 10 denotes an internal intermediate pressure multistage compression rotary compressor that uses carbon dioxide (CO ₂ ) as a refrigerant. The compressor 10 includes a cylindrical sealed container 12 and an upper side of the internal space of the sealed container 12. And the lower rotary compression element 32 (first stage) and the upper rotary compression element 34 (the first stage) driven by the rotating shaft 16 of the electric element 14. The compression element 18 is composed of a second stage).

The hermetic container 12 has an oil reservoir at the bottom, and is composed of a container body 12A that houses the electric element 14 and the compression element 18, and a substantially bowl-shaped end cap (lid body) 12B that closes the upper opening of the container body 12A. ing.
A circular mounting hole 12D is formed in the center of the upper surface of the end cap 12B. A terminal (wiring is omitted) 20 for supplying power to the electric element 14 is fixedly mounted in the mounting hole 12D. ing. Then, an internal / external wiring (not shown) communicating with the inside and outside of the sealed container 12 is connected via the terminal 20 to supply power to the electric element 14.

  An intermediate partition plate 36 is sandwiched between the lower rotary compression element 32 and the upper rotary compression element 34. That is, the lower rotary compression element 32 and the upper rotary compression element 34 include an intermediate partition plate 36, an upper cylinder 38 and a lower cylinder 40 disposed above and below the intermediate partition plate 36, and the upper and lower cylinders 38, 40. The upper and lower rollers 46 and 48 are rotated omnidirectionally by upper and lower omnidirectional portions 42 and 44 provided on the rotating shaft 16 with a phase difference of 180 degrees, and the upper and lower cylinders are in contact with the upper and lower rollers 46 and 48. 38 and 40 are divided into a low pressure chamber side and a high pressure chamber side, respectively, and the upper opening surface of the upper cylinder 38 and the lower opening surface of the lower cylinder 40 are closed to support the bearing of the rotary shaft 16. The upper support fixing member 54 and the lower support fixing member 56 are also used as the supporting members.

On the other hand, the upper support fixing member 54 and the lower support fixing member 56 are partially provided with a suction passage 60 (the upper suction passage is not shown) that communicates with the inside of the upper and lower cylinders 38 and 40 through a suction port (not shown). Are provided, and discharge silencing chambers 62 and 64 formed by closing the recessed portion with an upper cover 66 and a lower cover 68 are provided.
The discharge silencer chamber 64 and the inside of the sealed container 12 are communicated with each other through a communication passage that penetrates the upper and lower cylinders 38 and 40 and the intermediate partition plate 36, and an intermediate discharge pipe 121 is provided upright at the upper end of the communication passage. The intermediate pressure refrigerant gas compressed by the lower rotary compression element 32 is discharged from the intermediate discharge pipe 121 into the sealed container 12.

A suction passage 60 (upper side is not shown) of the upper support fixing member 54 and the lower support fixing member 56, a discharge silencer chamber 62, and an upper side of the upper cover 66 (on the electric element 14) Sleeves 142 and 143 are fixed by welding at positions corresponding to the positions substantially corresponding to the lower ends.
In addition, one end of a refrigerant introduction pipe 94 for introducing refrigerant gas into the lower cylinder 40 is inserted and connected in the sleeve 142, and one end of the refrigerant introduction pipe 94 communicates with the suction passage 60 of the lower cylinder 40. Further, one end of a refrigerant discharge pipe 96 is inserted and connected into the sleeve 143, and one end of the refrigerant discharge pipe 96 communicates with the discharge silencer chamber 62.

  The upper support fixing member 54 that supports and fixes the compression element 18 in the hermetic container 12 has an outer diameter smaller than the inner diameter of the hermetic container 12A, and the stator 22 of the electric element 14 is fixed inside. An electric element fixing part 1 having an inner diameter that can be fixed is fixed by a fixing means such as soldering, welding, or bolting via a cushioning material 2 such as a synthetic rubber or a spring. A step 3 for supporting the stator 22 is provided at an intermediate portion of the electric element fixing component 1.

  Then, a stator 22 of the electric element 14 is shrink-fitted at a predetermined position along the inner peripheral surface of the electric element fixing component 1 and fixed in an annular shape by means such as spot welding.

  The electric element 14 is a so-called magnetic pole concentrated winding type DC motor, and includes a stator 22 attached in an annular shape and a rotor 24 inserted and installed with a slight gap (gap) inside the stator 22. Become. The rotor 24 is fixed to a rotating shaft 16 that passes through the center and extends in the vertical direction.

  The stator 22 has a laminated body 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method. Further, the rotor 24 is formed of a laminated body 30 of electromagnetic steel sheets, like the stator 22, and is formed by inserting a permanent magnet MG into the laminated body 30.

Carbon dioxide (CO ₂ ) is used as the refrigerant, and the oil as the lubricating oil is, for example, an existing oil such as mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, PAG (polyalkyl glycol), or the like. used.

When the stator coil 28 of the electric element 14 of the compressor 10 is energized via the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. By this rotation, the upper and lower rollers 46 and 48 fitted to the upper and lower eccentric portions 42 and 44 provided integrally with the rotary shaft 16 rotate eccentrically in the upper and lower cylinders 38 and 40.
Thereby, the low-pressure refrigerant gas sucked into the low-pressure chamber side of the cylinder 40 from the suction port (not shown) via the suction passage 60 formed in the refrigerant introduction pipe 94 and the lower support member 56 is transferred between the roller 48 and the vane 52. It is compressed by the operation to become an intermediate pressure, and is discharged from the intermediate discharge pipe 121 into the sealed container 12 through a communication path (not shown) from the high pressure chamber side of the lower cylinder 40. Thereby, the inside of the sealed container 12 becomes an intermediate pressure.
The refrigerant discharged into the sealed container 12 is cooled by removing heat from the sealed container 12.

  The intermediate-pressure refrigerant gas is sucked into a low pressure chamber side of the upper cylinder 38 of the upper rotary compression element 34 from a suction port (not shown) via a suction passage (not shown) formed in the upper support fixing member 54, The second stage compression is performed by the operation of 46 and the vane 50 to form high-pressure and high-temperature refrigerant gas, and the refrigerant is discharged from the high-pressure chamber side through the discharge silencer chamber 62 formed in the upper support fixing member 54 through a discharge port (not shown). It is discharged from the pipe 96 to the outside.

  In the present invention, the stator 22 of the electric element 14 is not directly shrink-fitted or spot welded in the sealed container 12, and the stator 22 is predetermined along the inner peripheral surface of the electric element fixing component 1. Therefore, the vibration of the electric element 14 is not directly transmitted to the sealed container 12, and as a result, even if carbon dioxide is used as a refrigerant, vibration and noise can be suppressed. Since no excessive force is applied to the laminated body 26 and the stator coil 28 of the stator 22, the laminated body 26 is not deformed or broken, and the insulation of the winding of the stator coil 28 is not impaired. -An appropriate distance between the stator 22 and the rotor 24 is maintained, and it is possible to prevent improper shrinkage of the stator 22 and a gap between the stator 22 and the rotor 24, improve the motor efficiency, and stably operate over a long period of time. Reliability Kunar.

  The description of the above embodiment is for explaining the present invention, and does not limit the invention described in the claims or reduce the scope thereof. Moreover, each part structure of this invention is not restricted to the said embodiment, For example, the following various deformation | transformation are possible within the technical scope as described in a claim.

  In the above description, the two-stage compression rotary compressor has been described. However, the present invention is not particularly limited in the form of the compressor, and specifically, a reciprocating compressor, a vibration compressor, and a multi-vane rotary compressor. A scroll compressor or the like may be used, and the number of compression stages may be at least one stage of compression.

  The compressor of the present invention includes a home air conditioner, a commercial air conditioner (package air conditioner), an automotive air conditioner, a home refrigerator, a commercial refrigerator, a commercial freezer, a commercial freezer refrigerator, a showcase, a vending machine, a water heater, etc. It can be used for.

In the above description, the two-stage compression type rotary compressor using the cushioning material 2 has been described. However, the cushioning material 2 is preferably used, but is used when vibration and noise can be suppressed without using the cushioning material 2. You don't have to.
Further, the two-stage compression type rotary compressor in which the electric element fixing component 1 is attached at a predetermined position of the upper support fixing member 54 has been described. As another example, the electric element fixing component 1 is buffered at a predetermined position of the upper cylinder 38. Examples of attaching through the material 2 or attaching directly without using the buffer material 2 can be given.
Moreover, although the example which provided the level | step difference 3 for supporting the stator 22 in the intermediate part of the electrically-driven element fixing component 1 was demonstrated, the position, shape, dimension, etc. of the level | step difference 3 can be determined suitably. The step 3 is preferably provided, but may not be provided.
In the above description, the case where the electric element fixing component 1 has a cylindrical shape has been described. However, the electric element fixing component 1 is not limited to the cylindrical shape, and the stator 22 of the electric element 14 can be fixed inside. For example, if the stator 22 is a polygon, the electric element fixing part 1 may be a similar polygon.

  The compressor containing the electric element of the present invention does not directly shrink fit or spot weld the electric element in the sealed container, and attach the electric element fixing part to the support fixing member such as the cylinder or the main frame. Since the electric element is fixed by shrink fitting or spot welding inside the electric element fixing part, vibration of the electric element or the like is not directly transmitted to the sealed container, and as a result, carbon dioxide is used as a refrigerant. However, vibration and noise can be suppressed, and no excessive force is applied to the stack of stators and the stator coil, so that the stack is not deformed or broken, and the insulation of the windings of the stator coil is impaired. The stator and the rotor are kept at a proper distance from each other, and the stator shrinkage failure and the gap between the stator and the rotor can be prevented. Ri can be stable operation, because the increased reliability, high utility value on the industry.

It is a section explanatory view explaining one embodiment of the compressor of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric element fixing component 2 Buffer material 3 Level | step difference 10 Rotary compressor 12 Airtight container 14 Electric element 18 Compression element 22 Stator 24 Rotor 28 Stator coil 32 Lower rotation compression element 34 Upper rotation compression element 54 Upper support fixing member 94 Refrigerant Introduction pipe 96 Refrigerant discharge pipe

Claims (3)

A compression element and an electric element for driving the compression element are housed in a sealed container, the introduced refrigerant is compressed by the compression element, and the compressed refrigerant is discharged into the sealed container, or further, the sealed container In the compressor that compresses the refrigerant discharged into the compression element with the compression element and discharges the refrigerant outside the sealed container,
An electric element fixing component having an outer diameter smaller than an inner diameter of the hermetic container and having an inner diameter capable of fixing the electric element inside is attached to a support fixing member that supports and fixes the compression element in the hermetic container. In addition, a compressor storing an electric element, wherein the electric element is fixed inside the electric element fixing part.   The compressor according to claim 1, wherein the electric element fixing component is attached to the support fixing member via a cushioning material.   The compressor according to claim 1 or 2, wherein the refrigerant is carbon dioxide.

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