JPH1113668A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve abrasion resistance performance by forming a vane as specified powder iron having a specified component, carrying out hole sealing treatment after hardening, carrying out softly nitrifying on the vane after work is completed, and assembling alloy cast iron including Cr, Mo, B or P with the roller. SOLUTION: The material of a vane 32 is formed of iron sinter material, tool steel powder whose component is C of 0.6 to 1.3%, Cr of 3.4 to 4.8%, Mo of 3.6 to 5.5%, V of 1.4 to 3.0%, and W of 5.2 to 7.0%, and sintered density is set to 6.0 to 7.4 g/cm<3> . Quench-and-temper is carried out, steam treatment is carried out at 560 to 570 deg.C at the time of secondary tempering as the hole sealing treatment, and working is completed. And then, gas softly nitrifying is carried out at 550 to 560 deg.C. An embrittlement of the vane 32 is prevented by the steam treatment, and an abrasion resistance performance is held for a long times on a tip end part of the vane 32 by hardening the gas softly nitrifying to some extent. It is thus possible to improve a reliability having a good abrasion resistance performance in R22 refrigerant or in R22 substitution refrigerant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor, and more particularly to a compressor suitable for an HFC refrigerant as an R22 refrigerant, an R134a refrigerant, or an R22 substitute refrigerant.

[0002]

2. Description of the Related Art FIG. 3 shows a conventionally known rotary compressor.
A roller 13 eccentrically rotating within the cylinder 1 and the cylinder 1
The rotary compressor comprises a vane 14 which is inserted into a through groove 24 formed in a radial direction at 0 and which comes into and out of contact with the roller 13. Conventionally, the vane 14 is generally used by heat-treating a special iron-based material having excellent wear resistance.

[0003]

However, in recent years, the sliding conditions of vanes, rollers, and cylinders have become severe, and
As a substitute for the R22 alternative refrigerant, a combination of materials having better wear resistance has been required. Abrasion resistance is insufficient when used alone such as a special steel (including SKH51) such as a conventional vane, a special casting, and an iron-based sintered material. Further, the wear resistance is insufficient even by using a special casting such as a conventional roller or an iron-based sintered material alone. Further, wear resistance is insufficient even by using eutectic graphite cast iron, gray cast iron, or sintered iron alone as in a conventional cylinder. The present invention
An object of the present invention is to provide a rotary compressor in which vanes, rollers and cylinders are combined and have extremely excellent wear resistance.

[0004]

In order to solve the above-mentioned problems, a roller which is eccentrically rotated in the cylinder by a cylinder and a shaft, and a roller which is inserted in a groove formed in the cylinder in a radial direction so as to be able to protrude and retract, is provided. In a rotary compressor provided with a vane that slides, the vane is quenched with special powdered iron, and thereafter, in a tempering process,
After the completion of the working, the vane is soft-nitrided, and the rollers are Cr, Mo, B
Alternatively, wear resistance of the vane, the roller, and the cylinder is improved by combining an alloy cast iron containing P.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is characterized in that the vane is made of a high-speed tool steel having abrasion resistance and is a sintered material subjected to steam treatment and nitrocarburizing. Since the nitride layer is formed in a short time to the depth, the vane is a material having high wear resistance to the required depth.
The roller is also a material having high wear resistance.

[0006] According to a second aspect of the present invention, the steam treatment comprises:
A tempering process and a sealing process were performed.

According to a third aspect of the present invention, there is provided a material in which abrasion resistance is enhanced by gas nitrocarburizing after completion of the processing of the vane.

The invention according to claim 4 is a material having improved wear resistance by performing gas soft nitriding after completion of the processing of the vane.

A fifth aspect of the present invention is a cast iron material in which P is added to a roller to improve wear resistance.

The invention according to claim 6 is a cast iron material in which B is added to the roller to improve the wear resistance.

The invention according to claim 7 is a cast iron material in which pearlite is precipitated in a cylinder in an amount of 10% to 80% or more to improve wear resistance.

An eighth aspect of the present invention is a cast iron material having improved wear resistance by impregnating a vane with copper.

The ninth aspect of the present invention provides a highly reliable compressor in which the refrigerant of the present invention is HFC and the refrigerating machine oil is an ester oil.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below.

(Embodiment 1) FIG. 1 is a longitudinal sectional view of an embodiment of a compressor according to the present invention, and FIG. 2 is a transverse sectional view thereof. The motor unit 2 and the compression mechanism unit 3 are arranged inside the closed container 1, and the shaft 8 directly connected to the motor unit 2 includes a main bearing 9 and a sub-bearing 1.
1 supported. A roller 31 is disposed in the cylinder 30 and penetrates into the shaft 8 and the eccentric portion to perform a planetary motion.

The vane 32 inserted into the through groove 24 of the cylinder 30 divides the cylinder 30 pressed against the roller 31 by the spring 15 and the back pressure (discharge pressure) into the suction chamber 16 and the compression chamber 17.

The cylinder 30 is provided with a suction hole 5 and is connected to an accumulator (not shown) via the suction pipe 4.

The operation of this configuration will be described. The shaft 8 is driven by the motor unit 2, and the planetary motion of the roller 31 (left rotation in FIG. 2) passes through the suction pipe 4 through the suction hole 5,
Refrigerant gas such as HFC is sucked into the suction chamber 16, pressure is increased in the compression chamber 17, and is discharged from the discharge hole 6 into the closed container 1 through the discharge notch 19. At this time, the suction chamber 16
The vane 32 separating the compression chamber 17 is pressed against the outer periphery of the roller 31 by the pressure applied to the spring 15 and the back of the vane, and moves while sliding at the contact point. The lubricating oil at the sliding point is mainly lubricated by the oil mixed into the suction gas. The suction gas entering the suction pipe 4 circulates in the refrigerant cycle together with the refrigerant gas. Although the refrigerating machine oil 23 is contained in a small amount, a level of this level results in a boundary lubrication state close to metal contact, and severe sliding conditions are particularly required for HFCs in which refrigerant cannot be expected to have sliding properties.

As the material of the vane 32, the vane 32 is made of an iron-based sintered material and has a composition of C-0.6% to 1.3% and Cr of 3.4%.
-4.8%, Mo 3.6-5.5%, V1.4-3.0
%, W5.2-7.0%, using tool steel powder, quenching and tempering, and 560-57 at the time of the second tempering.
A steam treatment is performed at 0 ° C. to complete the processing, and then gas soft nitriding is performed at 550-560 ° C. The purpose of the steam treatment is to prevent the embrittlement when the gas nitrocarburizing is performed without the steam treatment, so that the vane becomes very brittle, and to insert the gas nitrocarburized to a certain depth. Thus, in particular, the tip of the vane 32 has long wear resistance. Further, a white layer having abrasion resistance due to nitriding can be formed not only on the surface portion of the vane 32 but also to a certain depth. The roller 31 is made of alloy cast iron in which components of 0.6% of Cr, 0.2% of Ni, and 0.2% of Mo are added and quenched and tempered. The cylinder 30 is made of a mold eutectic graphite cast iron. A description will be given of those containing 20-50% of pearlite. In the above-described operation state, the vane 32 reciprocates in the through groove 24 of the cylinder 30 while receiving pressure. Because of the reciprocating motion, an oil film hardly occurs on the through groove 24 of the cylinder 30 and the side of the vane, and severe sliding conditions are obtained. Further, as described above, the sliding condition between the tip of the vane 32 and the outer peripheral surface 33 of the roller 31 is close to metal contact with little oil. Since the vane portion 32 contains a large amount of W and V components having good wear resistance and includes a nitrocarburized layer having good wear resistance, even under severe sliding conditions, the vane 32 has This has the effect of reducing adhesive wear on the outer sliding surface 33 of the roller 31. The components Cr and Mo of the roller 31 are extremely excellent in wear resistance,
Is extremely excellent in hardenability, so that the combination of the vane 32 and the roller 31 results in a material combination having extremely excellent wear resistance. When the base of the cylinder 30 contains 10% or more of pearlite, the wear resistance of the vane 32 and the cylinder 30 is significantly improved. From the above, a highly reliable compressor can be realized.

(Embodiment 2) The vane 32 is impregnated with copper as a sealing treatment and is gas nitrocarburized. The nitrocarburization does not enter deeply because there are no vacancies. A hard layer and a soft layer of copper can be formed, an oil reservoir can be formed, and the heat conductivity of the vane can be improved, the vane temperature can be suppressed, and wear can be suppressed. The components of the roller are Cr 0.7%, B 0.04%, Ni 0.2%, Mo
0.2% alloy cast iron, heat treated, quenched and tempered. The cylinder 30 is made of sand type eutectic graphite cast iron containing about 20% of pearlite, and the wear resistance is very good. . From the above, a highly reliable compressor can be realized.

(Embodiment 3) The vane 32 is quenched and subjected to a steam treatment including a tempering effect.
The vane 32 which has been tempered, processed and gas nitrocarburized is applied to the roller 31 with Cr 0.7%, B 0.0
4%, Ni 0.2%, Mo 0.2% alloy cast iron to which the vane 32 and the outer peripheral portion 3 of the roller 31 are added.
The wear amount of No. 3 decreases.

[0022]

According to the vane of the present invention, the component of the iron-based sintered material is C-0.6-1.3%, Cr 3.4-4.8%, Mo3.
6-5.5%, V1.4-3.0%, W5.2-7.0
% Of tool steel, and the sintered density of the vane is 6.0-7.
4 g / cm ³ , a quenching heat treatment was performed, a sealing treatment was performed, the sealing treatment step was one of the tempering steps, and after the processing was completed, a soft nitriding treatment was performed. When a rotary compressor characterized by being quenched and tempered with an alloy cast iron containing at least Cr and Mo is operated, even in the R22 refrigerant,
(2) Even in the alternative refrigerant, the refrigerant has excellent wear resistance and high reliability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention.

FIG. 2 is a cross-sectional view of one embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional example.

[Explanation of symbols]

 31 rollers 32 vanes

Claims (9)

[Claims] 1. A rotary compressor comprising: a cylinder; a roller eccentrically rotating within the cylinder by a shaft; and a vane inserted removably into a groove formed in the cylinder in a radial direction and slidably in contact with the roller. , The vane contains 0.6-1.3% of component C, and Cr 3.4-4.8.
%, Mo 3.6-5.5%, V 1.4-3.0%, W
5.2-7.0% as a sintered material of tool steel, the sintering density of the vane is 6.0-7.4 g / cm ³ , quenching heat treatment is performed, and then sealing treatment is performed. The sealing process was one of the tempering processes, and after the completion of the processing, nitrocarburizing was performed. The roller was quenched and tempered with at least an alloy cast iron containing Cr and Mo. A rotary compressor. 2. The rotary compressor according to claim 1, wherein said sealing process is a steam process, and is a step of tempering. 3. The rotary compressor according to claim 1, wherein said nitrocarburizing treatment is gas nitrocarburizing. 4. The rotary compressor according to claim 1, wherein said soft nitriding treatment is a salt bath nitriding. 5. The rotary compressor according to claim 1, wherein said roller is made of alloy cast iron in which P is added to the components of said roller. 6. A rotary compressor according to claim 1, wherein said roller is made of alloy cast iron in which B is added to the components of said roller. 7. The cylinder is made of eutectic graphite iron, D-type or E-type, gray cast iron containing 10% or more of pearlite, or graphite is A-type graphite, and pearlite is 8%.
2. A gray cast iron or sintered iron containing 0% or more, and a pearlite content of 80% or more.
7. The rotary compressor according to any one of items 1 to 6, above. 8. The rotary compressor according to claim 1, wherein copper is impregnated as said sealing treatment of said vane. 9. The rotary compressor according to claim 1, wherein the refrigerant is HFC and the refrigerating machine oil is ester oil.