JP2007211674A - Compressor - Google Patents

Abstract

A highly efficient compressor capable of effectively reducing a rotor of a motor is provided.
A sealed container 40, a compression unit disposed in the sealed container 40, and an outer rotor motor disposed in the sealed container 40 and driving the compression unit are provided. The outer rotor motor has a stator 4 and a substantially cylindrical rotor 6 disposed on the outer peripheral side of the stator 4. And the surface treatment which gives lipophilicity to the area | region which opposes the outer peripheral surface of the rotor 6 at least of the internal peripheral surface of the said airtight container 40 is given. Further, the outer peripheral surface of the rotor (6) is subjected to a surface treatment for imparting oil repellency.
[Selection] Figure 4

Description

  The present invention relates to a compressor, and more particularly, to a compressor using an outer rotor type motor.

  Conventionally, as a compressor, there is one in which an outer rotor type motor that drives a compression unit is disposed in a sealed container (for example, Japanese Utility Model Laid-Open No. 60-31172 (Patent Document 1), Japanese Patent Application Laid-Open No. 2004-84653). (See Patent Document 2) and JP-A-2004-301038 (Patent Document 3)). An outer rotor type motor of the compressor includes a stator supported by components of a compression unit, and a cylindrical rotor disposed outside the stator.

  The outer rotor type motor is small and can output high power, but the moving surface (outer peripheral surface of the rotor) other than the clearance between the stator and the rotor is significantly increased in the outer rotor type motor compared to the inner rotor type motor. When such an outer rotor type motor is used in an airtight container in which refrigerant and refrigerating machine oil having a higher atmospheric gas density than air is used, the windage loss associated with the rotation of the rotor increases.

  Further, in the compressor using the outer rotor type motor, the refrigerating machine oil for lubrication becomes oil droplets and is scattered around the inner wall of the sealed container, particularly by the centrifugal force generated by the rotation of the motor. The oil droplets near the outer wall of the rotor repeatedly collide with other oil droplets, and the oil droplet diameter grows, and between the inner wall of the sealed container and the outer peripheral surface of the rotor, the increased oil droplet shear failure occurs. Accompanying viscosity loss occurs.

As described above, in the compressor using the conventional outer rotor type motor, the windage loss and the stirring loss of the rotor are increased, so that the efficiency of the compressor is lowered.
Japanese Utility Model Publication No. 60-31172 JP 2004-84653 A JP 2004-301038 A

  Accordingly, an object of the present invention is to provide a highly efficient compressor that can effectively reduce windage loss and stirring loss of a rotor of a motor.

In order to solve the above problems, the compressor of the first invention is
A sealed container;
A compression section disposed in the sealed container;
An outer rotor type motor disposed in the sealed container and driving the compression unit;
The outer rotor type motor has a stator and a substantially cylindrical rotor arranged on the outer peripheral side of the stator,
A region facing at least the outer peripheral surface of the rotor on the inner peripheral surface of the sealed container is oleophilic.

  According to the compressor having the above-described configuration, the refrigerating machine oil for lubrication becomes oil droplets and scatters in the vicinity of the inner wall of the sealed container by the centrifugal force generated by the rotation of the rotor. At this time, at least a region of the inner peripheral surface of the sealed container facing the outer peripheral surface of the rotor has lipophilicity, so that an oil film is formed on the inner peripheral surface of the sealed container having lipophilicity, and oil droplets are formed on the oil film. Is absorbed and flows downward. As a result, oil droplets are prevented from crossing between the inner peripheral surface of the hermetic container and the outer peripheral surface of the rotor, and viscosity loss due to shear failure of the oil droplets during this period is also reduced. Therefore, the oil return characteristics at the outermost periphery where a large amount of oil droplets are present in the sealed container are improved, oil accumulation at the top of the outer rotor type motor is prevented, and windage damage and stirring of the rotor caused by oil droplets are prevented. Loss can be effectively reduced and efficiency can be improved.

  Moreover, the compressor of one Embodiment is given the surface treatment which gives lipophilicity to the area | region which opposes the outer peripheral surface of the said rotor at least of the internal peripheral surface of the said airtight container.

  Moreover, the compressor of one Embodiment consists of a material which has at least the area | region which opposes the outer peripheral surface of the said rotor of the inner peripheral surface of the said airtight container.

Moreover, the compressor of one embodiment is as follows.
The compression part is arranged on the upper side in the sealed container,
The outer rotor type motor is arranged in a low-pressure region below the compression part in the sealed container and filled with a low-pressure refrigerant to be sucked into the compression part.

  According to the compressor of the above-described embodiment, in the configuration in which the low-pressure refrigerant is sucked into the upper compression portion from the low-pressure region where the outer rotor type motor is arranged, for example, the lower flow is provided in the flow path provided in the stator in the axial direction. Even if a large amount of oil droplets are scattered from the upper part of the outer rotor type motor to the outermost peripheral part of the sealed container, the refrigerant flows from the upper side to the upper side of the outer rotor type motor. Thus, the oil droplets easily return from the upper side to the lower side.

The compressor of the second invention is
A sealed container;
A compression section disposed in the sealed container;
An outer rotor type motor disposed in the sealed container and driving the compression unit;
The outer rotor type motor has a stator and a substantially cylindrical rotor arranged on the outer peripheral side of the stator,
The outer peripheral surface of the rotor has oil repellency.

  According to the compressor having the above-described configuration, the refrigerating machine oil for lubrication becomes oil droplets and scatters in the vicinity of the inner wall of the sealed container by the centrifugal force generated by the rotation of the rotor. At this time, since the outer peripheral surface of the rotor has oil repellency, oil droplets do not adhere to the outer peripheral surface of the rotor having oil repellency. As a result, oil droplets are prevented from crossing between the inner peripheral surface of the hermetic container and the outer peripheral surface of the rotor, and viscosity loss due to shear failure of the oil droplets during this period is also reduced. Therefore, the oil return characteristics at the outermost periphery where a large amount of oil droplets are present in the sealed container are improved, oil accumulation at the top of the outer rotor type motor is prevented, and windage damage and stirring of the rotor caused by oil droplets are prevented. Loss can be effectively reduced and efficiency can be improved.

  Moreover, the compressor of one Embodiment is given the surface treatment which gives oil repellency to the outer peripheral surface of the said rotor.

  Moreover, the compressor of one Embodiment consists of material in which the outer peripheral part of the said rotor has oil repellency.

Moreover, the compressor of one embodiment is as follows.
The compression part is arranged on the upper side in the sealed container,
The outer rotor type motor is arranged in a low-pressure region below the compression part in the sealed container and filled with a low-pressure refrigerant to be sucked into the compression part.

  According to the compressor of the above-described embodiment, in the configuration in which the low-pressure refrigerant is sucked into the upper compression portion from the low-pressure region where the outer rotor type motor is arranged, for example, the lower flow is provided in the flow path provided in the stator in the axial direction. Even if a large amount of oil droplets are scattered from the upper part of the outer rotor type motor to the outermost peripheral part of the sealed container, the refrigerant flows from the upper side to the upper side of the outer rotor type motor. Thus, the oil droplets easily return from the upper side to the lower side.

The compressor of the present invention is
A sealed container;
A compression section disposed in the sealed container;
An outer rotor type motor disposed in the sealed container and driving the compression unit;
The outer rotor type motor has a stator and a substantially cylindrical rotor arranged on the outer peripheral side of the stator,
A region facing at least the outer peripheral surface of the rotor on the inner peripheral surface of the sealed container has lipophilicity,
The outer peripheral surface of the rotor may have oil repellency.

  According to the compressor having the above-described configuration, the refrigerating machine oil for lubrication becomes oil droplets and scatters in the vicinity of the inner wall of the sealed container by the centrifugal force generated by the rotation of the rotor. At this time, at least a region of the inner peripheral surface of the sealed container facing the outer peripheral surface of the rotor has lipophilicity, and the outer peripheral surface of the rotor has oil repellency, so that the inner periphery of the sealed container having the lipophilic property is obtained. An oil film is formed on the surface, and the oil droplets are absorbed by the oil film and flow downward. On the other hand, the oil droplets do not adhere to the outer peripheral surface of the rotor having oil repellency. This effectively suppresses oil droplets from passing between the inner peripheral surface of the hermetic container and the outer peripheral surface of the rotor, and the viscosity loss due to shear fracture of the oil droplets during this period is greatly reduced. Therefore, the oil return characteristics at the outermost periphery where a large amount of oil droplets are present in the sealed container are improved, oil accumulation at the top of the outer rotor type motor is prevented, and windage damage and stirring of the rotor caused by oil droplets are prevented. The loss can be reduced more effectively and the efficiency can be improved.

  As is clear from the above, according to the compressors of the first and second inventions, it is possible to realize a highly efficient compressor that can effectively reduce the windage loss and stirring loss of the rotor of the motor.

  Further, according to the compressor of one embodiment, the inner surface of the sealed container is subjected to a simple process of applying a lipophilic surface treatment to at least a region of the inner peripheral surface of the sealed container facing the outer peripheral surface of the rotor. It is possible to easily suppress oil droplets from passing between the peripheral surface and the outer peripheral surface of the rotor.

  Moreover, according to the compressor of one embodiment, the region facing at least the outer peripheral surface of the rotor on the inner peripheral surface of the sealed container is made of a lipophilic material, so that the inner peripheral surface of the sealed container and the rotor It is possible to easily suppress oil droplets from crossing with the outer peripheral surface.

  In addition, according to the compressor of an embodiment, the outer peripheral surface of the rotor is subjected to a surface treatment for imparting oil repellency to the outer peripheral surface of the sealed container and the outer peripheral surface of the rotor by a simple process. It is possible to easily suppress the oil droplets from crossing.

  Further, according to the compressor of one embodiment, the outer peripheral portion of the rotor is made of an oil-repellent material, so that oil droplets pass between the inner peripheral surface of the sealed container and the outer peripheral surface of the rotor. Can be easily suppressed.

  Moreover, according to the compressor of one Embodiment, in the structure by which a low pressure refrigerant | coolant is suck | inhaled by the upper compression part from the low voltage | pressure area | region where the outer rotor type motor is arrange | positioned, there exists an effect of this invention especially.

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

  FIG. 1 shows a longitudinal sectional view of a main part of a scroll compressor according to an embodiment of the present invention.

  As shown in FIG. 1, the scroll compressor includes a main body 1, a cylindrical support 2 extending from the main body 1, a main shaft 3 fitted in the support 2, and the support 2. The stator 4 is fixed to the outer periphery of the stator 4 and is fixed to the front end side of the main shaft 3 protruding from the support portion 2 via the rotor support portion 5 as an example of a rotor support member. A cylindrical rotor 6 as a rotor arranged so as to surround the side is provided in the sealed container 40. In this scroll compressor, the main body 1 and the support 2 are integrally formed. The main shaft 3 is rotatably supported by a main bearing (not shown) and a sub-bearing (not shown) provided inside the support portion 2 and at a predetermined interval from the main body portion 1 side.

  The main shaft 3, the stator 4 and the rotor 6 constitute an outer rotor type motor M. A plurality of plate-like permanent magnets 14 are embedded in the rotor 6 at predetermined intervals in the circumferential direction inside a rotor core made of a high permeability material such as iron.

  The compression unit 10 is disposed in the sealed container 40 and above the main body unit 1. The compression unit 10 includes a fixed scroll 11 fixed on the upper side of the main body 1 and a turning scroll 12 that is overlapped with the fixed scroll 11 and supported by the main body 1 so as to be revolved. The orbiting scroll 12 has an end plate 12a and a spiral wrap (not shown) provided on the end plate 12a. The spiral wrap of the orbiting scroll 12 is meshed with the spiral wrap provided on the fixed scroll 11 to form a plurality of compression chambers between the fixed scroll 11 and the orbiting scroll 12. Further, a boss 13 is erected on the lower side of the end plate 12 a of the orbiting scroll 12, and an eccentric shaft (not shown) fitted inside the boss 13 is provided on the upper end side of the main shaft 3.

  Further, a suction port (not shown) for sucking low-pressure refrigerant is provided in the side wall of the sealed container 40 below the compression unit 10, and high-pressure refrigerant is discharged to the top plate of the sealed container 40 above the compression unit 10. A discharge port (not shown) is provided.

  FIG. 2 shows an enlarged cross-sectional view of the main part of the scroll compressor.

  As shown in FIG. 2, a plurality of first flow paths 21 are formed along the axial direction inside the stator 4 that is externally fitted to the support portion 2 and in the vicinity of the support portion 2. Further, a second flow path 22 (air gap portion) formed between the outer periphery of the stator 4 and the inner periphery of the rotor 6 is formed, and a third between the outer periphery of the rotor 6 and the inner wall of the sealed container 40 is formed. A flow path 23 is formed.

  Further, the inner wall of the sealed container 40 is subjected to a surface treatment for imparting lipophilicity, and the outer peripheral surface of the rotor 6 is subjected to a surface treatment for imparting oil repellency.

  Here, as an example of the coating agent used for the surface treatment for imparting lipophilicity, a terminal group or a side chain of a methyl group or an ethyl group such as TPX (registered trademark; manufactured by Mitsui Chemicals) using a methylpentene copolymer or an olefin is used. The materials that are included in

  Examples of the coating agent used for the surface treatment for imparting oil repellency include Teflon (registered trademark; DuPont, USA) based on PTFE (polytetrafluoroethylene) and silicon materials.

  Next, FIG. 3 shows an enlarged cross-sectional view of the main part of the compressor as a comparative example during operation. The compressor of this comparative example is for comparison with the compressor of the embodiment of the present invention, and is not the present invention. The compressor as a comparative example shown in FIG. 3 has the same configuration as the compressor shown in FIGS. 1 and 2 of the present invention, except that the inner wall of the sealed container and the outer peripheral surface of the rotor are not subjected to surface treatment. ing.

  As shown in FIG. 3, since the outer rotor type motor M is disposed in the hermetic container 40 and in the low pressure region below the compression unit 10 (shown in FIG. 1), the low pressure refrigerant is sucked into the compression unit 10. As a result, refrigerant flows from the lower side to the upper side in the first and second flow paths 21 and 22. Note that a suction port (not shown) of the compression unit 10 is provided on the lower side of the main body unit 1 so as to open to a low pressure region where the outer rotor type motor M is disposed. Further, the discharge port (not shown) of the compression unit 10 is provided on the upper side of the fixed scroll 11 so as to open to the high pressure region of the compression unit 10.

  As shown in FIG. 3, due to the centrifugal force generated by the rotation of the rotor 6, the oil droplets are scattered radially outward near the inner wall of the sealed container 40. In this compressor, the oil droplets in the third flow path 23 between the inner wall of the sealed container 40 and the outer peripheral surface of the rotor 6 repeatedly collide with other oil droplets, and the oil droplet diameter grows. The oil droplet 31 extends between the inner wall 40 and the outer peripheral surface of the rotor 6. Viscosity loss accompanying shear failure of these oil droplets 31 reduces the efficiency of the compressor.

  On the other hand, in the compressor shown in FIGS. 1 and 2 according to the embodiment of the present invention, the lipophilicity of the sealed container 40 as shown in FIG. The oil film 20 is formed on the inner wall that has been surface-treated so that the oil film 32 absorbs oil droplets and flows downward. On the other hand, oil droplets do not adhere to the outer peripheral surface of the rotor 6 that has been subjected to a surface treatment that provides oil repellency. Thereby, it is suppressed that an oil droplet crosses between the inner wall of the airtight container 40, and the outer peripheral surface of the rotor 6, and the viscous loss by the shear fracture | rupture of an oil droplet in the meantime is also reduced.

  Therefore, the oil return characteristic at the outermost peripheral portion where a large amount of oil droplets in the sealed container 40 are present is improved, oil accumulation at the upper portion of the outer rotor type motor M is prevented, and the motor rotor caused by the oil droplets is prevented. Wind loss and stirring loss can be effectively reduced, and efficiency can be improved.

  In the above embodiment, the outer rotor type motor used for the scroll compressor has been described. However, the present invention may be applied to a compressor having another configuration such as a rotary compressor.

  Moreover, in the said embodiment, although the compressor which performed the surface treatment which gives lipophilic property to the inner wall of the airtight container 40 was demonstrated, you may provide the cover which consists of a lipophilic material which covers the inner wall of an airtight container separately. Alternatively, at least a region of the inner peripheral surface of the sealed container facing the outer peripheral surface of the rotor may be made of a lipophilic material.

  Further, in the above-described embodiment, the compressor in which the outer peripheral surface of the rotor 6 is subjected to the surface treatment for imparting oil repellency has been described, but the outer peripheral surface of the rotor may be separately provided with a cover made of a member having oil repellency. Or the outer peripheral part of a rotor may consist of a member which has oil repellency.

  Furthermore, in the above embodiment, the inner wall of the sealed container 40 is subjected to a surface treatment for imparting lipophilicity and the outer peripheral surface of the rotor 6 is subjected to a surface treatment for imparting oil repellency. The surface treatment that imparts oil or the surface treatment that imparts oil repellency to the outer peripheral surface of the rotor may be performed. Further, instead of surface treatment, a cover made of a lipophilic material may be provided so as to cover the inner wall of the sealed container, or only a cover made of a member having oil repellency is covered on the outer peripheral surface of the rotor. It may be provided.

FIG. 1 is a longitudinal sectional view of a compressor according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the main part of the compressor. FIG. 3 is an enlarged cross-sectional view of a main part of a compressor as a comparative example during operation. FIG. 4 is an enlarged cross-sectional view of the main part of the compressor of the above embodiment during operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main-body part 2 ... Support part 3 ... Main shaft 4 ... Stator 5 ... Rotor support part 6 ... Rotor 7 ... Boss 10 ... Compression part 11 ... Fixed scroll 12 ... Orbiting scroll 12a ... End plate 13 ... Boss 14 ... Permanent magnet 21 ... First DESCRIPTION OF SYMBOLS 1 flow path 22 ... 2nd flow path 23 ... 3rd flow path 31 ... Oil droplet 32 ... Oil film 40 ... Sealed container M ... Outer rotor type motor

Claims (8)

A sealed container (40);
A compression section (10) disposed in the sealed container (40);
An outer rotor type motor (M) disposed in the sealed container (40) and driving the compression section (10);
The outer rotor type motor (M) has a stator (4) and a substantially cylindrical rotor (6) disposed on the outer peripheral side of the stator (4).
The compressor characterized in that at least a region of the inner peripheral surface of the sealed container (40) facing the outer peripheral surface of the rotor (6) has lipophilicity. The compressor according to claim 1,
At least a region of the inner peripheral surface of the sealed container (40) facing the outer peripheral surface of the rotor (6) is subjected to a surface treatment for imparting lipophilicity or includes at least a material having lipophilicity. A compressor characterized in that a lipophilic member is formed. The compressor according to claim 1,
The compressor characterized in that at least a region of the inner peripheral surface of the sealed container (40) facing the outer peripheral surface of the rotor (6) is made of a lipophilic material. The compressor according to any one of claims 1 to 3,
The compression part (10) is arranged on the upper side in the sealed container (40),
The outer rotor type motor (M) is disposed in a low pressure region filled with a low pressure refrigerant to be sucked into the compression section (10) below the compression section (10) in the sealed container (40). The compressor characterized by having. A sealed container (40);
A compression section (10) disposed in the sealed container (40);
An outer rotor type motor (M) disposed in the sealed container (40) and driving the compression section (10);
The outer rotor type motor (M) has a stator (4) and a substantially cylindrical rotor (6) disposed on the outer peripheral side of the stator (4).
The compressor characterized in that the outer peripheral surface of the rotor (6) has oil repellency. The compressor according to claim 5, wherein
A compressor characterized in that the outer peripheral surface of the rotor (6) is subjected to a surface treatment for imparting oil repellency. The compressor according to claim 5, wherein
A compressor characterized in that the outer peripheral portion of the rotor (6) is made of a material having oil repellency. The compressor according to any one of claims 5 to 7,
The compression part (10) is arranged on the upper side in the sealed container (40),
The outer rotor type motor (M) is disposed in a low pressure region filled with a low pressure refrigerant to be sucked into the compression section (10) below the compression section (10) in the sealed container (40). The compressor characterized by having.

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