JP2002005042A - Swing compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a swing compressor to be easily manufactured and having a fully lubricating performance on a sliding face. SOLUTION: A piston 4 integrated with a roller 2 and a blade 3 is formed by sintering. The piston 4 made of sintering material is easily made g because working man-hour for cutting can be reduced comparing with the one by casting. It retains lubricant in the many pores of the piston because a sintered material is porous to avoid seizing on the sliding face of the piston and to stably retain a performance of the swing compressor. And a breakage can be avoided at a stress concentration of the joint with a roller 2 and a blade 3 on starting of the swing compressor 1 because the joint with the roller 2 and the blade 3 is mechanically heightened with liquid metal infiltration of Cu.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing compressor used in, for example, an air conditioner.

[0002]

2. Description of the Related Art Conventionally, as a swing compressor of this kind, a piston formed by integrally forming a roller and a blade is provided in a cylinder chamber formed in a cylinder, and a suction chamber and a discharge chamber are formed in the cylinder chamber. And a substantially semi-cylindrical 2 in the bush fitting hole provided in the cylinder.
There is one in which two swinging bushes are fitted, and both sides of the blade are sandwiched between flat portions of the two swinging bushes.

The piston is manufactured by casting.
Further, since the entire surface of the roller and the blade of the piston is a sliding surface, the piston is cast, and then substantially the entire surface of the piston is cut and further polished.

[0004]

However, in the above-mentioned conventional swing compressor, since the roller and blade of the piston are integrally formed and have a complicated shape, the cutting of the piston is very troublesome. There's a problem.

[0005] In the above polishing of the piston, it is very troublesome to grind the piston in which the roller and the blade are integrally formed.

In addition, the conventional swing compressor has a large number of sliding surfaces of the piston, so that, for example, when the swing compressor is restarted after a while after being stopped, the piston is liable to burn. is there. This problem has recently been raised as a refrigerant for refrigeration
HF instead of chloro-fluoro-carbon-based refrigerant
C (hydro-fluoro-carbon) -based refrigerants are frequently used, and are particularly likely to occur. because,
Synthetic oils used with HFC refrigerants as lubricating oils are:
This is because lubricity is inferior to that of the mineral oil used with the conventional HCFC-based refrigerant. Further, since the HFC-based refrigerant does not contain a chlorine component, a chlorine film is not formed on the sliding surface as in the case of using the conventional HCFC-based refrigerant. Therefore, the problem of burning of the sliding surface is more likely to occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a swing compressor which can be easily manufactured and has a sufficient lubrication performance for a sliding surface.

[0008]

According to a first aspect of the present invention, there is provided a swing compressor, comprising: a piston formed of a roller and a blade integrally formed with the roller; In the swing compressor, which is partitioned into a discharge chamber and both side surfaces of the blade are sandwiched by bushes of a substantially semi-cylindrical shape, the piston is
It is characterized by being formed by sintering.

According to the swing compressor of the first aspect, since the piston is formed by sintering, the piston can be formed accurately and the number of processing steps such as cutting can be reduced as compared with the conventional casting. , Making the swing compressor easier.

Further, since the sintered material is porous, lubricating oil is held in the porosity of the piston formed by sintering. Therefore, for example, even if the swing compressor is stopped for a long time, the lubricating oil does not run out from the sliding surface of the piston. As a result, seizure on the sliding surface of the piston is avoided, and the performance of the swing compressor is maintained. In addition, even when the swing compressor is used for a refrigerator using HFC refrigerant, for example, and synthetic oil having lubrication performance inferior to mineral oil is used corresponding to the HFC refrigerant, the porosity of the piston holds the synthetic oil. Therefore, the lubricating oil does not disappear from the sliding surface. Therefore, the swing compressor having the piston has the same reliability as the conventional swing compressor of the HCFC refrigerant even when used in a refrigerator using an HFC-based refrigerant.

A swing compressor according to a second aspect of the present invention is the swing compressor according to the first aspect, wherein Cu (copper) is infiltrated into a connecting portion between the roller and the blade of the piston.

According to the second aspect of the present invention, since the connecting portion between the roller and the blade is infiltrated with Cu, the mechanical strength of the connecting portion is large. Therefore, even if stress concentrates on the connecting portion between the roller and the blade when driving the piston, damage to the piston is avoided and the reliability of the swing compressor is maintained.

According to a third aspect of the present invention, in the swing compressor according to the first or second aspect, a connecting portion between the roller and the blade of the piston has a higher sintering density than other portions of the piston. It is characterized by.

According to the third aspect of the present invention, since the sintering density of the connecting portion between the roller and the blade is high,
The mechanical strength of this connection part is large. Therefore, even if stress concentrates on the connecting portion between the roller and the blade when driving the piston, damage to the piston is avoided and the reliability of the swing compressor is maintained.

According to a fourth aspect of the present invention, there is provided the swing compressor according to any one of the first to third aspects, wherein at least a side surface of the blade of the piston is infiltrated with resin or Cu. I have.

According to the fourth aspect of the present invention, when there is a possibility that the compressed fluid leaks from the discharge side to the suction side via the blade, resin or Cu is infiltrated into at least a side surface of the blade of the piston. As a result, the high-pressure compressed fluid is prevented from penetrating through the blade and leaking to the low-pressure side when the compressor performs a compression operation. Therefore, this swing compressor has high compression efficiency despite having a piston made of a sintered material.

According to a fifth aspect of the present invention, in the swing compressor according to the fourth aspect, the side of the blade of the piston is spaced apart from the end face of the bush and the portion protruding into the cylinder chamber. The resin or Cu is infiltrated into a small area.

According to the swing compressor of the fifth aspect, in the blade, the area where the resin and Cu are infiltrated is made smaller than the area where the blade is exposed to the compressed fluid. The function of preventing the leakage of the compressed fluid and the function of retaining the lubricating oil by the holes of the sintered material are obtained. As a result, in the blade, the leakage of the compressed fluid is appropriately prevented, and the sliding friction with the bush is appropriately reduced, so that the efficiency and reliability of the swing compressor are compatible.

According to a sixth aspect of the present invention, in the swing compressor according to any one of the first to fifth aspects, the blade of the piston has a higher sintered density than other portions of the piston. It is characterized by.

According to the sixth aspect of the present invention, the sintering density of the piston blade is increased to reduce the number of holes in the sintered material. As a result, when the compressor performs the compression operation, the compressed fluid that has been compressed to a high pressure is prevented from penetrating the blade and leaking to the low pressure side. Therefore,
This swing compressor has a high compression efficiency despite having a piston made of a sintered material.

According to a seventh aspect of the present invention, there is provided the swing compressor according to the sixth aspect, wherein a portion of the piston blade is smaller than a portion of the piston protruding farthest from the end face of the bush into the cylinder chamber. Is characterized by having a higher sintering density than other parts of the piston.

According to the swing compressor of the seventh aspect, in the blade, the area where the sintering density is increased is made smaller than the area where the blade is exposed to the compressed fluid.
The function of preventing the leakage of the compressed fluid and the function of retaining the lubricating oil are obtained. As a result, in the blade, the leakage of the compressed fluid is appropriately prevented, and the sliding friction with the bush is appropriately reduced, so that the efficiency and reliability of the swing compressor are compatible.

The swing compressor according to the invention of claim 8 is:
The swing compressor according to any one of claims 1 to 7, wherein the piston is made of an iron-based sintered material.

According to the swing compressor of claim 8, the piston is formed of an iron-based sintered material, and the expansion coefficient of the piston is the same as the expansion coefficient of other parts made of iron sliding on the piston. I have to. Therefore, even if the temperature of the swing compressor changes, between the piston and other parts,
The occurrence of gaps and kinks due to differences in the expansion rates is prevented.

The swing compressor according to the ninth aspect of the present invention
The swing compressor according to any one of claims 1 to 7, wherein the piston is made of an Al (aluminum) -based sintered material and Si (silicon).

According to the swing compressor of the ninth aspect, the piston is formed by sintering the Al-based sintered material and Si at a predetermined ratio, so that the expansion rate of the piston is reduced to the expansion rate of iron. Make them almost the same. Then, the expansion coefficient of the piston is substantially the same as the expansion coefficient of the other parts made of iron by sliding with the piston. There is no gap or twist between them.

The piston made of the Al-based sintered material and Si is lighter in weight than the iron-based material. Therefore, the balance weight provided corresponding to the eccentrically driven piston is also reduced in weight, and the total weight of the eccentrically rotating piston and the balance weight is reduced. as a result,
A swing compressor provided with a piston made of an Al-based sintered material and Si has less vibration than a swing compressor provided with a piston made of an iron-based material.

A swing compressor according to a tenth aspect of the present invention is the swing compressor according to any one of the first to ninth aspects, wherein Ni-P (nickel phosphorus) and PTFE (poly tetra・ Fluoro ・
(Ethylene) coating.

According to the swing compressor of the tenth aspect, after the piston is formed by sintering, the surface is coated with Ni-P and PTFE to enhance the mechanical strength and lubricity of the piston. That is, the piston does not require machining such as cutting when the conventional piston is manufactured by casting, and the manufacture is relatively easy. As a result, the labor and man-hours for manufacturing the piston are saved, and the manufacturing cost of the swing compressor is reduced.

According to the eleventh aspect of the present invention, the cylinder chamber is divided into a suction chamber and a discharge chamber by a piston comprising a roller and a blade integrally formed with the roller, and both side surfaces of the blade are provided. Is sandwiched between substantially semi-cylindrical bushes, wherein the bushes are formed by sintering.

According to the swing compressor of the eleventh aspect, since the bush is formed by sintering, the bush can be manufactured accurately, and the number of processing steps such as cutting can be reduced as compared with the conventional casting. Manufacturing of the compressor is facilitated.
Further, since the sintered material is porous, the lubricating oil is held in the porosity of the bush formed by sintering. Therefore, burning on the sliding surface between the bush and the blade is avoided, and the performance of the swing compressor is maintained.

According to a twelfth aspect of the present invention, in the swing compressor according to the eleventh aspect, Cu is infiltrated into the bush.

According to the swing compressor of the twelfth aspect, since the bush is infiltrated with Cu, the mechanical strength of the bush is large. Therefore, even if stress concentrates on the end of the bush, for example, cracking or chipping of the bush is prevented, and the reliability of the swing compressor is maintained.

Further, since the bush seals the holes of the sintered material by infiltrating Cu, the high-pressure compressed fluid does not leak to the low-pressure side through the bush. Therefore, the compression efficiency of the swing compressor having the bush is improved.

According to a thirteenth aspect of the present invention, in the swing compressor according to the eleventh or twelfth aspect, the bush is made of an iron-based sintered material.

According to the thirteenth aspect of the present invention, the bush is formed by sintering an iron-based sintered material, so that the expansion coefficient of the bush is adjusted by fitting or sliding with the bush. The expansion coefficient of the component consisting of Therefore, even if the temperature of the swing compressor changes,
Since there is no gap or kinking between the bush and the component due to the difference in the expansion coefficient, the performance of the swing compressor is stabilized.

According to a fourteenth aspect of the present invention, in the swing compressor according to the eleventh or twelfth aspect, the bush is made of an Al-based sintered material and Si.

According to a fourteenth aspect of the present invention, the bush is formed by mixing an Al-based sintered material and Si at a predetermined ratio and sintering the bush. And almost the same. Therefore, the expansion coefficient of the bush is the same as the expansion coefficient of the part made of iron that is fitted or slid with the bush. Therefore, even if the temperature of the swing compressor changes, the bush and the part are not changed. There is no gap or twist between them. As a result, the performance of the swing compressor is stabilized.

According to a fifteenth aspect of the present invention, the cylinder chamber is divided into a suction chamber and a discharge chamber by a piston comprising a roller and a blade formed integrally with the roller, and both side surfaces of the blade are provided. Wherein the piston is formed by sintering, and the surface of the piston is provided with a composite electroless nickel plating layer containing a self-lubricating material. .

According to the swing compressor of claim 15, the piston is formed by sintering, and the surface of the piston contains a self-lubricating material such as boron fluoride, boron nitride, molybdenum disulfide, and PTFE. Apply a composite electroless nickel plating layer. The composite electroless nickel plating layer can be formed with a uniform layer thickness even in a piston having a complicated shape. Furthermore, when the swing compressor is operated, the composite electroless nickel plating layer slides on the sliding surface in the cylinder chamber, and only the portion to be worn is worn and removed. Here, even if the composite electroless nickel plating layer is slightly worn, since the self-lubricating material is dispersed in fine particles, the lubricating function of the sliding surface is maintained by the self-lubricating material. In addition, the sliding portion of the composite electroless nickel plating layer wears, while the non-sliding portion remains to seal the gap between the inner surface of the cylinder and the compression efficiency and reliability of the swing compressor. improves.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 is a plan view showing a swing compressor according to the present invention. The swing compressor 1 is used, for example, as a compressor of a refrigerator using an HFC-based refrigerant. The swing compressor 1 includes a roller 2 having a substantially circular cross section.
And a blade 4 formed integrally with a blade 3 protruding radially outward of the roller 2. This piston roller 2 has an eccentric shaft 5b connected to a drive shaft 5a.
Is fitted. The piston 4 is housed in a cylinder chamber 8 formed in a cylinder 6 and having a substantially circular cross section. A bush fitting hole 7 is formed in the cylinder 6 in contact with the cylinder chamber 8, and bushings 9, 9 having a substantially semi-cylindrical shape are fitted into the bush fitting hole 7. The bushes 9, 9 have flat surfaces of the bushes 9, 9 opposed to each other, and slidably sandwich both side surfaces of the blade 3 of the piston between the flat surfaces. The cylinder chamber 8 is formed by the roller 2 and the blade 3
The chamber on the right side in FIG. 1 of the blade 3 has a suction port 11 opened to the inner peripheral surface of the cylinder chamber 8 to form a suction chamber 12. On the other hand, in the chamber on the left side of the blade 3 in FIG. 1, a discharge port (not shown) is opened on the inner peripheral surface of the cylinder chamber 8 to form a discharge chamber 13.

The piston 4 of the swing compressor 1 is made of an iron-based sintered material, and Cu is infiltrated into the connection between the roller 2 and the blade 3. Further, on both sides of the blade 3 of the piston 4, when the blade 3 slides between the bushes 9, 9, a hole 15 of the sintered material is formed in a portion 15 where the blade 3 projects most from the bush 9, 9. Is infiltrated with PTFE as a resin for closing the space. The bushes 9, 9 are also formed of an iron-based sintered material.

The operation of the swing compressor 1 having the above configuration will be described. The eccentric shaft 5b rotates eccentrically around the drive shaft 5a, and the outer circumferential surface of the roller 2 fitted to the eccentric shaft 5b Revolves in contact with the inner peripheral surface. As the roller 2 revolves in the cylinder chamber 8, the blade 3 moves forward and backward while being held on both sides by bushes 9, 9. Then, the low pressure HFC
After the system refrigerant is sucked into the suction chamber 12 and compressed in the discharge chamber 13 to a high pressure, a high-pressure HFC
The system refrigerant is discharged. The HFC-based refrigerant is mixed with a synthetic oil as a lubricating oil. When the swing compressor 1 performs a compression operation, a sliding surface inside the swing compressor 1, for example, an outer peripheral surface of the roller 2 and a cylinder chamber 8 are formed. The inner peripheral surface and the like are lubricated by the lubricating oil mixed with the refrigerant.

When a refrigerating machine including the swing compressor 1 is stopped and a long time has elapsed, lubricating oil flows down from a sliding surface inside the compressor 1, for example, an inner surface of a cylinder chamber 8 on which an outer surface of a piston slides. There are cases. However, in the swing compressor 1, since the piston 4 is made of a porous sintered material, lubricating oil is held in holes formed on the surface and inside of the piston 4. Therefore, even if the swing compressor 1 is started in a state where the lubricating oil has run out from the inner surface of the cylinder chamber 8, the lubricating oil held in the hole flows out due to the revolving motion of the piston 4, and the lubricating oil is Since the space between the roller 2 and the cylinder chamber 8 is lubricated,
Does not cause burning. The bushes 9, 9 fitted in the bush fitting holes 7 of the cylinder 6 are also made of a sintered material. Therefore, since the bushing 9, 9 also holds the lubricating oil in a porous manner, the lubricating oil is provided between the bushing 9, 9 and both side surfaces of the blade 3 and between the bushing 9 and the inner surface of the bush fitting hole 7. Oil is supplied and baking does not occur. In addition to the above-described sliding surfaces, the sliding surface on which the seizure is avoided is the end surface of the piston 4 in the drive shaft 5a direction and the cylinder chamber 8.
, The fitting portion between the roller 2 of the piston 4 and the eccentric shaft 5b, the space between the end surface of the bushes 9, 9 in the direction of the drive shaft 5a and the inner surface of the cylinder chamber 8, and the like. That is, although this swing compressor uses a synthetic oil that is inferior in lubricity as compared with mineral oil, and is used in a refrigerator using an HFC-based refrigerant that does not form a lubricating film with a chlorine film on a sliding surface, It has the same lubricating performance as a compressor of a refrigerator using a conventional HCFC-based refrigerant.

Since the component made of the sintered material is porous, there is a possibility that the surface and the internal hole communicate with each other, and the fluid permeates. In such a case, the blade 3 of the piston is provided on both sides of the blade 3 with a portion 15 where the blade 3 projects most from the bushes 9, 9.
FE is infiltrated to close the holes on the surface of the blade 3. Therefore, in the compression process of the swing compressor, the high-pressure refrigerant in the discharge chamber 13 does not leak through the blade 3 to the low-pressure suction chamber 12. As a result, the swing compressor 1 has high compression efficiency.

When the swing compressor 1 is started or when the rotation speed of the piston 4 of the swing compressor 1 is increased, the refrigerant in the cylinder becomes a resistance, and the roller 2 of the piston 4 and the blade The stress concentration occurs at the connection portion with No. 3. However, the connecting portion between the roller 2 and the blade 3 is infiltrated with Cu to increase the mechanical strength, so that it is not damaged by the stress concentration. Therefore, the swing compressor 1 has high reliability.

The piston 4 of the swing compressor 1
Is formed by sintering, so that the piston can be formed accurately, and there is almost no need for cutting work and polishing of the roller peripheral surface and both side surfaces of the sliding surface as in the piston by the conventional casting. Therefore, the number of manufacturing steps for the piston 4 can be reduced, and the manufacturing of the swing compressor 1 is easy and inexpensive.

In the above embodiment, the connecting portion between the roller 2 and the blade 3 of the piston 4 is infiltrated with Cu to increase the mechanical strength, but the sintered density of the connecting portion between the roller 2 and the blade 3 is reduced. The mechanical strength may be increased to increase the mechanical strength. Further, Cu may be infiltrated while increasing the sintering density.

In the above embodiment, the blade 3 is provided on both sides of the blade 3 of the piston 4 with the bush 9,
PTFE was infiltrated into the portion 15 most protruding from the blade 9 to prevent the coolant from penetrating the blade 3.
Other resins stable to heat and refrigerant other than the above may be infiltrated. In addition, not only resin but also Cu may be infiltrated into the portion 15 of the blade 3 that protrudes from the bushes 9, 9. May be reduced to prevent the coolant from penetrating through the blade 3. The side where the resin and Cu are infiltrated may be one side instead of both sides of the blade 3, or the resin and Cu may be infiltrated into the end face of the blade.

In the above embodiment, the region where the PTFE is infiltrated on both sides of the blade 3 of the piston 4 is the portion 15 where the blade 3 projects most from the bushes 9, 9, but the PTFE is infiltrated. The area may be smaller than the most protruding part 15. Blade 3 above
If the region where the PTFE is infiltrated is smaller than the protruding portion 15, the portion where the surface of the sintered material of the blade 3 is exposed becomes large. Therefore, in blade 3,
The coolant is prevented from penetrating through the blade 3 and the lubricating oil is held in the exposed portion of the sintered material, so that the efficiency and reliability of the swing compressor 1 can be compatible. Further, the blade 3 is not limited to only the infiltration of PTFE, and may prevent penetration of the refrigerant by increasing infiltration of Cu and sintering density.

In the above embodiment, the blade 3 and the bushes 9, 9 are made of an iron-based sintered material.
A sintered material composed of a system-based sintered material and Si may be used. When the piston 4 is formed of a sintered material composed of the Al-based sintered material and Si, the weight of the piston 4 can be reduced. Therefore, the piston 4 is provided on the drive shaft of the piston 4 in accordance with the eccentricity of the piston 4. Some balance weights can also be reduced. As a result, the eccentric weight around the drive shaft is reduced, so that the vibration of the swing compressor can be reduced.
Further, the sintered material composed of the Al-based sintered material and Si,
Since the coefficient of expansion is substantially the same as the coefficient of expansion of iron, the coefficient of expansion of the piston 4 and the bushes 9, 9 is adjusted by the sliding or fitting of the piston 4 and the bushes 9, 9 to other parts made of iron. The expansion rate can be matched. as a result,
Even if the temperature of the swing compressor 1 changes, the piston 4
Also, there is no gap or twist between the bushes 9 and 9 and the above components. Therefore, the reliability of the swing compressor 1 can be increased.

In the above embodiment, the piston 4 and the bushes 9, 9 are formed by sintering to reduce the number of processing steps, and the lubricating performance of the sliding surface is maintained by holding the lubricating oil in the pores, which is a characteristic of sintering. However, the surface of the sintered material may be coated with Ni-P and PTFE. That is, after the piston 4 and the bushes 9, 9 are easily formed by sintering, Ni-P and PTFE coatings are applied in order to increase the mechanical strength and improve the surface lubrication performance. By doing so, it is possible to save the time and labor for cutting and polishing after casting as in the related art.

On the surface of the piston 4, for example, boron fluoride, boron nitride, molybdenum disulfide, PTFE
Or a composite electroless nickel plating layer containing a self-lubricating material such as Then, the nickel plating layer can be formed with a uniform thickness even for a piston having a complicated shape. Further, by operating the swing compressor, only the portion of the composite electroless nickel plating layer that should be worn due to friction with the sliding surface in the cylinder chamber is worn and removed. At this time,
Even if the composite electroless nickel plating layer is slightly worn, since the self-lubricating material is dispersed with fine particles, the lubricating function of the sliding surface can be maintained by the self-lubricating material. This self-lubricating material is one of the materials described above.
PTFE is particularly preferred from the viewpoint of excellent stability. In addition, the sliding portion of the composite electroless nickel plating layer is worn away and removed, while the non-sliding portion remains to seal the gap between the piston and the cylinder inner surface. Therefore, since the composite electroless nickel plating layer has a lubricating function and a sealing function, the compression efficiency and reliability of the swing compressor can be efficiently improved.

[0055]

As is apparent from the above description, in the swing compressor according to the first aspect of the present invention, since the piston is formed by sintering, the piston can be accurately formed, and compared with the case where the piston is manufactured by conventional casting. Since the number of processing steps such as cutting can be reduced, a swing compressor can be easily manufactured.

Further, since the lubricating oil is held in the pores of the piston formed by sintering, seizure on the sliding surface of the piston can be avoided, and the performance of the swing compressor can be stably maintained.

According to a second aspect of the present invention, in the swing compressor according to the first aspect, Cu is infiltrated into a connecting portion between the roller and the blade of the piston to increase the mechanical strength of the connecting portion. In addition, the piston can be prevented from being damaged when the swing compressor is started, and the reliability of the swing compressor can be maintained.

In the swing compressor according to the third aspect of the present invention, the sintering density of the connecting portion between the roller and the blade of the piston is higher than that of the other portion of the piston, and the mechanical strength of the connecting portion is increased. In addition, the piston can be prevented from being damaged when the swing compressor is started, and the reliability of the swing compressor can be maintained.

According to a fourth aspect of the present invention, there is provided the swing compressor, wherein the resin or Cu
To infiltrate the pores of the sintered material, so that high-pressure compressed fluid is prevented from penetrating through the blade and leaking to the low-pressure side, and the compression efficiency of the swing compressor can be increased.

In the swing compressor according to a fifth aspect of the present invention, the resin or Cu is infiltrated in a region where the blade is separated from the end face of the bush and less than a portion most protruding into the cylinder chamber. While preventing leakage of the compressed fluid with the above resin or Cu,
Since the lubricating oil can be held by the holes of the sintered material, both efficiency and reliability of the swing compressor can be achieved.

In the swing compressor according to the sixth aspect of the present invention, since the sintering density of the piston blade is made higher than the sintering density of the other part of the piston to reduce the number of holes in the sintered material, Since the compressed fluid can be prevented from leaking to the low pressure side through the blade, the compression efficiency of the swing compressor can be increased.

According to a seventh aspect of the present invention, in the swing compressor, the sintering density of a portion of the piston blade that is smaller than a portion of the piston that is farthest from the end face of the bush and protrudes into the cylinder chamber is reduced. Since the sintering density is higher than the sintering density, leakage of compressed fluid in the blade can be prevented and lubricating oil can be retained, so that both efficiency and reliability of the swing compressor can be achieved.

In the swing compressor according to the eighth aspect of the present invention, since the piston is formed of an iron-based sintered material, the expansion coefficient of this piston can be made substantially the same as the expansion coefficient of other parts made of iron. When the temperature of the machine changes, it is possible to prevent the occurrence of a gap or kinking between the piston and other parts.

In the swing compressor according to the ninth aspect of the present invention, the piston is formed by sintering the Al-based sintered material and Si at a predetermined ratio. Since the expansion coefficient can be made substantially the same, it is possible to prevent the occurrence of a gap or kinking between the piston and other parts when the temperature of the swing compressor changes.

Since the piston made of the Al-based sintered material and Si is lighter in weight than the iron-based material, the balance weight provided corresponding to the piston driven eccentrically can be reduced in weight. In addition, the weight of the eccentrically rotating piston and the balance weight is reduced, and the vibration of the swing compressor can be reduced.

According to a tenth aspect of the present invention, after the piston is formed by sintering, Ni-P and PT
Since the mechanical strength and lubricity of the piston are improved by coating with FE, the number of processing steps such as cutting when manufacturing the conventional piston by casting is reduced, and a piston having strength and lubricity relatively easily can be obtained. Can be manufactured.

In the swing compressor according to the eleventh aspect of the present invention, since the bush is formed by sintering, the number of processing steps such as cutting can be reduced as compared with the conventional casting, and the manufacture of the swing compressor can be facilitated. . In addition, since the sintered material is porous, the sliding oil of the bush can be prevented from burning by retaining the lubricating oil in the porous material, so that the reliability of the swing compressor can be improved.

According to the twelfth aspect of the present invention, since the mechanical strength is increased by infiltrating Cu into the bush, the bush can be prevented from cracking or chipping, and the reliability of the swing compressor can be maintained.

Further, since the bush is infiltrated with Cu to seal the holes of the sintered material, it is possible to prevent the high-pressure compressed fluid from leaking to the low-pressure side through the bush, thereby reducing the compression efficiency of the swing compressor. Can be improved.

In the swing compressor according to the thirteenth aspect, since the bush is formed of an iron-based sintered material, the bush is slid and has the same expansion coefficient as other parts made of iron.
It is possible to prevent a gap or twisting between the bush and the other components due to a temperature change of the swing compressor.

In the swing compressor according to the fourteenth aspect of the present invention, since the sintered material of the bush is formed of an Al-based sintered material and Si, the expansion coefficient of the bush is slid with the bush so that another component made of iron is formed. By making the expansion coefficient almost the same as that of the above, it is possible to prevent a gap or kinking between the bush and the other components due to a temperature change of the swing compressor.

According to a fifteenth aspect of the present invention, a piston formed by sintering is provided with a composite electroless nickel plating layer containing a self-lubricating material such as boron fluoride, boron nitride, molybdenum disulfide, or PTFE. As a result, a uniform layer thickness can be formed even in a piston having a complicated shape. Moreover, since the self-lubricating material is dispersed in fine particles in the composite electroless nickel plating layer, the lubricating function of the sliding surface can be maintained. Further, the composite electroless nickel plating layer slides on the sliding surface in the cylinder chamber, and only the portion to be worn away is worn away and removed, while the non-sliding portion remains to remove the piston and the cylinder chamber inner surface. , The compression efficiency and reliability of the swing compressor can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a swing compressor according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Swing compressor 2 Roller 3 Blade 4 Piston 5a Drive shaft 5b Eccentric shaft 6 Cylinder 7 Bush fitting hole 8 Cylinder chamber 9 Bush 11 Suction port 12 Suction chamber 13 Discharge chamber 15 Portion where blade 3 projects most from bush 9,9

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B22F 7/08 B22F 7/08 F C23C 26/00 C23C 26/00 K 30/00 30/00 AZ F04C 29/00 F04C 29/00 U // C23C 18/52 C23C 18/52 A (72) Inventor Koji Nakano 1000-2 Oya, Okamotocho, Kusatsu-shi, Shiga Prefecture Daikin Industries, Ltd. Shiga Works (72) Inventor Masanori Masuda 3-12 Chikushinmachi, Sakai-shi, Osaka Daikin Industries Co., Ltd.Sakai Factory Rinkai Factory F-term (reference) DA01 4K044 AA02 AA06 AB08 BA06 BA21 BB01 BC01 BC06 CA53

Claims (15)

[Claims] 1. A piston (4) comprising a roller (2) and a blade (3) integrally formed with the roller (2).
Thereby, the inside of the cylinder chamber (8) is divided into a suction chamber (12) and a discharge chamber (13), and both sides of the blade (3) are sandwiched between bushes (9, 9) having a substantially semi-cylindrical shape. A swing compressor according to claim 1, wherein said piston (4) is formed by sintering. 2. The swing compressor according to claim 1, wherein Cu is infiltrated into a connection portion between the roller (2) and the blade (3) of the piston (4). 3. The swing compressor according to claim 1, wherein a connection portion of the piston (4) between the roller (2) and the blade (3) has a higher sintered density than other portions of the piston (4). Swing compressor characterized by high performance. 4. The swing compressor according to claim 1, wherein at least a side surface of the blade (3) of the piston (4) is infiltrated with resin or Cu. Machine. 5. The swing compressor according to claim 4, wherein on the side of the blade (3) of the piston (4),
The part (1) where the blade (3) projects farthest into the cylinder chamber (8) away from the end face of the bush (9, 9)
5) A swing compressor characterized in that the resin or Cu is infiltrated in a smaller area than in the case of 5). 6. The swing compressor according to claim 1, wherein the blade (3) of the piston (4) has a higher sintering density than the other part of the piston (4). A swing compressor. 7. The swing compressor according to claim 6, wherein, in the blade (3) of the piston (4), the blade (3) is separated from an end face of the bush (9, 9) and in the cylinder chamber (8). A swing compressor characterized in that a portion less than a portion (15) most protruding from the piston has a higher sintering density than other portions of the piston (4). 8. The swing compressor according to claim 1, wherein said piston (4) is made of an iron-based sintered material. 9. The swing compressor according to claim 1, wherein the piston (4) is made of an Al-based sintered material and Si. 10. The swing compressor according to claim 1, wherein Ni-P and PTFE are provided on a surface of the piston (4).
A swing compressor characterized by having been coated with a. 11. A suction chamber (12) in a cylinder chamber (8) by a piston (4) comprising a roller (2) and a blade (3) formed integrally with the roller (2).
And a discharge chamber (13), wherein both sides of the blade (3) are sandwiched by bushes (9, 9) having a substantially semi-cylindrical shape. Formed by sintering. 12. The swing compressor according to claim 11, wherein said bush (9, 9) is infiltrated with Cu. 13. The swing compressor according to claim 11, wherein the bush (9, 9) is made of an iron-based sintered material. 14. The swing compressor according to claim 11, wherein the bush (9, 9) is made of an Al-based sintered material and Si. 15. A suction chamber (12) in a cylinder chamber (8) by a piston (4) comprising a roller (2) and a blade (3) formed integrally with the roller (2).
And a discharge chamber (13), and the piston (4) is sintered in a swing compressor (1) in which both side surfaces of the blade (3) are sandwiched by bushes (9, 9) having a substantially semi-cylindrical shape. A swing compressor formed by sintering and applying a composite electroless nickel plating layer containing a self-lubricating material to the surface of the piston (4).