JP2000291545A - Compressor and pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent corrosion without exposing aluminum alloy to refrigerant directly, and suppress generation of sludge and the like by uniformly dispersing aluminum nitride on a surface of a sliding parts of a sintered alloy comprising aluminum powder as a main component. SOLUTION: A vibration type compressor is composed of a motor 3, cylinder 5, bearing 6, piston 13, resonance spring 11, and cylinder head 10, refrigerant gas led from a suction hole in the piston 13 into a compression chamber is compressed by the reciprocating motion of the piston 13. In this case, the piston 13 is made of an sintered alloy comprising aluminum powder as a main component, and particles of aluminum nitride are dispersed uniformly on the surface of a sliding part of the piston 13. In a condition, in which feeding of oil is few at start of initial phase in the particles of the aluminum nitride which is uniformly dispersed on the sliding surface, since its hardness is at a high level and its abrasion resistance property is improved reduce an abrasion quantity can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor and a pump used for a refrigerator or an air conditioner.

[0002]

2. Description of the Related Art Compressors used in refrigerating cycles and the like have conventionally used CFC-12 (dichlorodifluorofluorocarbon) as a refrigerant.
Methane, CCl2F2) and HCFC-22 (monochlorodifluoromethane, CHClF2) have been mainly used, but chlorine (Cl2) is contained in the molecule from the viewpoint of the influence on the human body and biological systems due to the destruction of the ozone layer and global warming. A) HFC-based refrigerant that does not contain atoms, for example, HFC-134a
(1,1,1, -tetrafluoroethane, CHF2C
F3) and other natural refrigerants (hydrocarbon, carbon dioxide, ammonia, hydrogen, helium, etc.) have been used.

[0003] In a compressor used for a refrigeration cycle or the like, a sliding portion has conventionally been lubricated with refrigerant and oil. However, from the viewpoint of environmental destruction, an oil-free compressor in which oil is not sealed in the compressor. The development of is desired.

However, the refrigerant is changed from CFC-12 to HFC-
By changing to 134a, an iron chloride (FeClx) film having excellent wear resistance is no longer formed, and the oil-free state deteriorates the sliding state, so that the friction coefficient increases and the efficiency deteriorates. The amount of wear also increases.

In such a situation, it is necessary to develop a material with a low coefficient of friction and to improve the wear resistance of the sliding material in order to improve the efficiency and reliability of the compressor.

As a conventional compressor, there is, for example, one disclosed in Japanese Utility Model Laid-Open No. 58-116784 as a vibration type compressor.

An example of the conventional compressor will be described below with reference to the drawings.

FIG. 8 is a sectional view of a conventional compressor.

The main body 1 includes a motor 3, a cylinder 5, a bearing 6, a piston 8, a resonance spring 11, and a cylinder head 10, and is elastically supported in a closed casing 2 by a suspension spring (not shown). ing. The motor 3 includes a stator 4 formed by coil windings and a mover 7 formed by an iron core. The mover 7 is fixed to a piston 8.

The cylinder 5 and the bearing 6 support the piston 8 so as to be movable in the axial direction. One end of the resonance spring 11 is fixed to the mover 7 of the motor 3, the other end is fixed to the bearing 6, and a part is immersed in the lubricating oil 12 stored in the closed casing 2.

Reference numeral 8a denotes a compression chamber constituted by a cylinder 5 and a piston 8. The refrigerant gas introduced from the suction hole 8b in the piston 8 into the compression chamber 8a is compressed by the reciprocating motion of the piston 8.

The lubricating oil 12 accumulated in the lower portion of the closed casing 2 is agitated by the expansion and contraction of the resonance spring 11 accompanying the reciprocation of the piston 8 in the axial direction. The sliding part between the piston 8 and the bearing 6 and the sliding part between the piston 8 and the bearing 6 are lubricated.

Conventionally, a sliding member constituting a sliding portion of the compressor 1 has been formed of a cast iron material or an aluminum alloy. In particular, aluminum alloys have been used from the viewpoint of efficiency.

[0014]

However, in the above-mentioned conventional aluminum alloy, there is a possibility that abrasion may increase in a state where the supply of oil is small, such as at the beginning of startup.

The present invention solves the conventional problems and provides a highly reliable compressor and pump with improved lubrication characteristics of a sliding material and improved wear resistance even when the supply of oil is small. The purpose is to: Another object of the present invention is to provide a highly reliable compressor and pump even when oil is not sealed in the compressor and pump.

In the conventional aluminum alloy, the coefficient of friction is reduced and the efficiency is improved, but the strength is weak,
When the load increased due to oil compression or the like, there was a possibility of causing breakage.

An object of the present invention is to solve the conventional problems, and an object of the present invention is to provide a compressor and a pump that prevent breakage by improving the strength of an aluminum-based material.

In the conventional aluminum alloy, the coefficient of friction is reduced and the efficiency is improved as compared with the cast iron material. However, when the liquid refrigerant enters the sliding portion, the oil dissolves in the refrigerant. This causes the oil on the sliding part to be washed off,
As the wear increased, the coefficient of friction increased and the efficiency could be reduced.

SUMMARY OF THE INVENTION The present invention solves the conventional problems. A compressor and a pump for improving the wear resistance and preventing a decrease in efficiency by improving the strength of an aluminum-based material and modifying its surface. For the purpose of providing. Also,
An object of the present invention is to provide a highly reliable compressor and pump even when oil is not sealed in the compressor and the pump.

In the conventional aluminum alloy, when carbon dioxide is used as a refrigerant, the reaction between water and carbon dioxide contained in the system corrodes the aluminum alloy, generates sludge and the like, and roughens the surface. Therefore, the coefficient of friction may increase and the efficiency may decrease.

The present invention solves the conventional problems. By coating the surface of an aluminum-based alloy so that the aluminum-based alloy is not directly exposed to a refrigerant, it prevents corrosion, suppresses the generation of sludge and the like, and improves the efficiency. It is an object of the present invention to provide a compressor or a pump that prevents a decrease in pressure. Another object of the present invention is to provide a highly reliable compressor and pump even when oil is not sealed in the compressor and pump.

[0022]

In order to achieve this object, a compressor and a pump according to the present invention provide a sliding part made of a sintered alloy whose main component is aluminum powder in which aluminum nitride (AlN) is uniformly dispersed on the surface. Characterized by the following.

Thus, a highly reliable compressor or pump having improved wear resistance by uniformly dispersing aluminum nitride (AlN) having excellent wear resistance in the sliding portion can be obtained.

The compressor and the pump according to the present invention are characterized in that they are made of a sliding part of a sintered alloy whose main component is aluminum powder having a particle size of 100 nm to 300 nm.

As a result, the high strength of the material prevents breakage and the fine particle size reduces the voids between the particles and improves the surface roughness, thereby improving the efficiency and improving the reliability. Compressors and pumps are obtained.

The compressor and the pump according to the present invention are characterized in that they are made of a sliding part obtained by nitriding the surface of a sintered alloy whose main component is aluminum powder having a particle diameter of 100 nm to 300 nm. .

Thus, the surface is modified into aluminum nitride (AlN) having excellent wear resistance to improve the wear resistance and suppress the surface roughness, thereby preventing the efficiency from decreasing and the material strength. As a result, a compressor and a pump with high reliability in which breakage is prevented can be obtained.

The compressor and the pump according to the present invention are characterized in that they are made of a sliding part in which the surface of an aluminum alloy is coated with tetrafluoroethylene to which carbon is added.

This prevents corrosion of the aluminum-based alloy by not directly exposing the aluminum-based alloy to the refrigerant, suppresses the generation of sludge and the like, and improves the efficiency because the coefficient of friction of ethylene tetrafluoride is low. High compressors and pumps are obtained.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is characterized in that a sliding part of a sintered alloy whose main component is aluminum powder in which aluminum nitride (AlN) is uniformly dispersed on the surface is provided. The sintered alloy according to the present invention has an effect of improving wear resistance by uniformly dispersing aluminum nitride (AlN) having excellent wear resistance in a sliding portion.

The invention according to claim 2 of the present invention is characterized in that it is made of a sliding part made of a sintered alloy whose main component is aluminum powder having a particle size of 100 nm to 300 nm. Sintered alloys have the effect of preventing breakage by increasing the material strength. Further, since the particle size is fine, the pores between the particles are reduced and the surface roughness is improved, so that there is an effect that the efficiency is improved.

According to a third aspect of the present invention, there is provided a sliding component comprising a sintered alloy whose main component is aluminum powder having a particle diameter of 100 nm to 300 nm, the surface of which is nitrided. The sintered alloy according to the present invention comprises:
By modifying the surface to aluminum nitride (AlN) having excellent wear resistance, it has an effect of improving wear resistance, suppressing surface roughness, and preventing a decrease in efficiency. Further, as in the case of the second aspect, there is an effect that the damage can be prevented by increasing the material strength.

The invention according to a fourth aspect of the present invention is characterized by comprising a sliding part in which the surface of an aluminum alloy is coated with ethylene tetrafluoride to which carbon is added. The aluminum-based alloy has an effect that the surface is made of a material having excellent wear resistance, thereby preventing corrosion and suppressing generation of sludge or the like. Further, it has the effect of preventing surface roughness due to corrosion and improving efficiency because ethylene tetrafluoride is a low friction coefficient material.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a compressor according to the present invention will be described below with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) FIG. 1 is a sectional view of a compressor according to Embodiment 1 of the present invention. FIG. 2 is an enlarged view of a portion A of the piston of the embodiment.

In FIGS. 1 and 2, reference numeral 13 denotes a piston of a sintered alloy mainly composed of aluminum powder, and reference numeral 14 denotes particles of aluminum nitride (AlN).

Aluminum nitride (AlN) is applied on the sliding surface of the piston 13 made of a sintered alloy containing aluminum powder as a main component.
Of the aluminum nitride (AlN) uniformly dispersed on the sliding surface even in a state where the supply of oil is small at the initial stage of starting or the like, by uniformly dispersing the particles 14 of the aluminum alloy and the casting material. Compared with the conventional example using the piston 8, the hardness is high and the wear resistance is excellent, so that the wear amount is reduced.

As described above, the compressor of this embodiment is constituted by the sintered alloy piston 13 whose main component is aluminum powder in which aluminum nitride (AlN) is uniformly dispersed on the surface. Bonded gold piston 1
3. Aluminum nitride (AlN) particles 1 on the sliding surface
4 is uniformly dispersed, so that the wear resistance is improved.

In this embodiment, the piston 13 made of a sintered alloy whose main component is aluminum powder of the vibrating compressor is used.
However, the same effect can be obtained with other sliding parts or sliding parts of a compression system other than the vibration type compressor. Further, regardless of the refrigerant used, for example, HFC
Similar effects can be obtained in the case of a compressor using a natural refrigerant such as -134a refrigerant or hydrocarbon, or in the case of a pump or the like not using a refrigerant. Furthermore, an oilless compressor that does not enclose refrigerating machine oil in the compressor is also possible.

(Embodiment 2) FIG. 3 is a sectional view of a compressor according to Embodiment 2 of the present invention.

In FIG. 3, reference numeral 15 denotes a piston for sintering aluminum powder.

The particle diameter of the aluminum powder forming the piston 15 for sintering the aluminum powder is from 100 nm to 30 nm.
Tensile strength of 600MPa by miniaturization to 0nm
As described above, since the material strength is increased as compared with the conventional example using the aluminum alloy piston 8 having a tensile strength of 500 Mpa or less, even if the load increases due to oil compression or the like, breakage can be prevented. . Further, since the particles are fine, pores between the particles are small, the surface roughness is improved, and the efficiency is improved due to a low friction coefficient.

As described above, the compressor of the present embodiment is constituted by the sintered alloy piston 15 whose main component is aluminum powder having a particle diameter of 100 nm to 300 nm. Since the particle size of the powder is reduced from 100 nm to 300 nm, the material strength is increased, so that damage can be prevented. In addition, since the particle size is small, pores between the particles are reduced and the surface roughness is improved, so that efficiency is improved. improves.

In this embodiment, the piston 15 of aluminum powder sintered with the particle size of the vibrating compressor reduced from 100 nm to 300 nm is taken as an example, but other sliding parts and vibrating compressors are used. The same effect can be obtained with a sliding part of a compression system other than the above. Furthermore, in the present embodiment, a sintered material of aluminum powder whose particle size is reduced from 100 nm to 300 nm is taken as an example, but an element having a low specific gravity such as silicon (Si) may be added to reduce the weight. Similar effects can be obtained. Further, the same effect can be obtained regardless of the refrigerant used, for example, in the case of a compressor using a natural refrigerant such as an HFC-134a-based refrigerant or hydrocarbon, or in the case of a pump or the like that does not use a refrigerant.

(Embodiment 3) FIG. 4 is a sectional view of a compressor according to Embodiment 3 of the present invention. FIG. 5 is an enlarged view of a portion B of the piston of the embodiment.

In FIGS. 4 and 5, reference numeral 16 denotes a piston for sintering a nitrided aluminum powder, reference numeral 17 denotes an aluminum powder, and reference numeral 18 denotes a nitride layer.

The particle size forming the piston 16 is 100 nm
The nitrided layer 18 is formed on the surface by nitriding a sintered material of aluminum powder 17 having a thickness of 300 nm to 300 nm. Further, since the main component of the nitrided layer 18 formed on the surface is aluminum nitride (AlN) having excellent wear resistance, when the liquid refrigerant mixes into the sliding portion, the oil is mixed into the refrigerant by sliding into the refrigerant. Even in the case where the oil of the moving part is washed out, it is possible to prevent abrasion, suppress surface roughness, and prevent a decrease in efficiency. Further, similarly to the invention of claim 2, the aluminum powder 17 having a particle diameter of 100 nm to 300 nm has a tensile strength of 600 MPa or more, which is higher than that of an aluminum alloy having a tensile strength of 500 Mpa or less. Accordingly, breakage can be prevented even when the load increases due to oil compression or the like.

As described above, the compressor of this embodiment has a particle size of 1
The piston 16 is formed by nitriding the surface of a sintered alloy mainly composed of aluminum powder of 00 to 300 nm. The nitrided layer 18 is formed on the surface by nitriding a sintered material of aluminum powder 17 having a particle diameter of 100 to 300 nm. Is generated, so that abrasion resistance is improved and surface roughness is suppressed, so that a high rate of reduction can be prevented, and breakage can be prevented by increasing the material strength.

In this embodiment, the piston 16 for sintering the nitrided aluminum powder of the vibrating compressor is used.
However, the same effect can be obtained with other sliding parts or sliding parts of a compression system other than the vibration type compressor. Further, in the present embodiment, the sintered material of the aluminum powder 17 whose particle diameter is reduced from 100 nm to 300 nm is taken as an example. However, in order to reduce the weight, an element having a low specific gravity such as silicon (Si) is added. Has the same effect. Further, regardless of the refrigerant used, for example, HFC-134
Similar effects can be obtained in the case of a compressor using a natural refrigerant such as a-based refrigerant or hydrocarbon, or in the case of a pump or the like that does not use a refrigerant. Furthermore, an oilless compressor that does not enclose refrigerating machine oil in the compressor is also possible.

(Embodiment 4) FIG. 6 is a sectional view of a compressor according to Embodiment 4 of the present invention. FIG. 7 is an enlarged view of a portion C of the piston of the embodiment.

In FIGS. 6 and 7, reference numeral 19 denotes a piston of a coated aluminum alloy, reference numeral 20 denotes an aluminum alloy, and reference numeral 21 denotes a carbon tetrafluoride ethylene layer.

Aluminum alloy 2 as base material of piston 19
Zero-tetrafluoroethylene layer 21 with carbon added
The aluminum alloy 20 is not directly exposed to the refrigerant by coating the carbon dioxide, and when carbon dioxide is used as the refrigerant as compared with the conventional example using the aluminum alloy piston 8, the water contained in the system and the carbon dioxide are reduced. Corrosion due to reaction with carbon can be prevented, and generation of sludge and the like can be suppressed. Further, by adding carbon to ethylene tetrafluoride, elution of ethylene tetrafluoride by carbon dioxide can be prevented. Furthermore, by coating the surface with a carbon tetrafluoroethylene layer 21 to which carbon is added, the surface roughness is prevented, so that the increase in the coefficient of friction is suppressed, and the coefficient of friction of the tetrafluoroethylene is lower than that of the aluminum alloy. More efficiency is improved.

As described above, the compressor of this embodiment is constituted by the piston 19 in which the surface of an aluminum alloy is coated with ethylene tetrafluoride to which carbon is added. And the generation of sludge can be suppressed. Further, the surface roughness due to corrosion is prevented, and the efficiency is improved because ethylene tetrafluoride is a low coefficient of friction material.

In this embodiment, the piston 19 of the aluminum alloy coated with the vibration type compressor is described as an example, but other sliding parts and other types of compression type slides other than the vibration type compressor are used. Similar effects can be obtained even with parts. Furthermore, an oilless compressor that does not enclose refrigerating machine oil in the compressor is also possible.

[0055]

As described above, according to the first aspect of the present invention, the sliding component is made of a sintered alloy sliding component whose main component is aluminum powder in which aluminum nitride (AlN) is uniformly dispersed on the surface. Since aluminum nitride (AlN) having excellent wear resistance is uniformly dispersed in the moving part, wear resistance is improved.

Further, the invention according to claim 2 has a particle diameter of 1
Since the sliding parts are made of a sintered alloy whose main component is aluminum powder of 00 nm to 300 nm, the strength of the material is increased, so that breakage can be prevented. Since the roughness is improved, the efficiency is improved.

Further, according to the third aspect of the present invention, the particle size is 1
Aluminum nitride (Al) having excellent wear resistance on the surface because it is made of a sliding part having a surface of a sintered alloy whose main component is aluminum powder of 00 nm to 300 nm is nitrided.
By being modified to N), abrasion resistance is improved and surface roughness is suppressed, so that a high rate of reduction can be prevented, and breakage can be prevented since the material strength is increased.

Further, the invention according to claim 4 comprises a sliding part in which the surface of an aluminum alloy is coated with tetrafluoroethylene to which carbon is added, so that the aluminum alloy is not directly exposed to the refrigerant. Corrosion can be prevented and the generation of sludge and the like can be suppressed. Further, the surface roughness due to corrosion is prevented, and the efficiency is improved because ethylene tetrafluoride is a low coefficient of friction material.

[Brief description of the drawings]

FIG. 1 is a sectional view of a compressor according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a compressor according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a compressor according to a third embodiment of the present invention.

FIG. 5 is an enlarged view of a portion B according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a compressor according to a fourth embodiment of the present invention.

FIG. 7 is an enlarged view of a portion C according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view of a conventional compressor.

[Explanation of symbols]

 13 piston of a sintered alloy mainly composed of aluminum powder 14 particles of aluminum nitride 15 piston of sintering of aluminum powder 16 piston of sintering of aluminum powder after nitriding 17 aluminum powder 18 nitrided layer 19 coating of aluminum alloy Piston 20 Aluminum alloy 21 Carbon tetrafluoride ethylene

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H003 AA01 AB00 AC00 AD01 BD09 BD10 CA02 CE04 CE05 3H071 AA15 BB01 CC11 CC15 CC26 CC31 CC44 CC47 DD01 DD06 DD46 EE01 EE02 EE03 EE04 EE05 EE06 EE07 EE08 EE09 EE11 EE12 EE11 CC27 CC34

Claims (4)

[Claims] 1. A compressor and a pump comprising a sliding part of a sintered alloy whose main component is aluminum powder in which aluminum nitride (AlN) is uniformly dispersed on the surface. 2. A compressor and a pump comprising a sliding part of a sintered alloy whose main component is aluminum powder having a particle size of 100 nm to 300 nm. 3. A compressor and a pump comprising a sliding part obtained by nitriding the surface of a sintered alloy whose main component is aluminum powder having a particle size of 100 nm to 300 nm. 4. A compressor and a pump comprising sliding parts in which the surface of an aluminum-based alloy is coated with ethylene tetrafluoride to which carbon is added.