JPH1122677A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding material superior in the abrasion resistance in a rotary compressor for R134a coolant, R22 coolant and R22 alternate coolant. SOLUTION: A cylinder 30, a roller 31 eccentrically rotated in the cylinder 30 by a shaft 8, and a vane 32 stored in a compression part formed on an inner wall face of the cylinder 30, moved forward and backward to the inner wall face of the cylinder 30, and slided in a condition that one edge thereof is kept into contact with an outer peripheral face 33 of the roller 31, are formed by the high speed steel or martensitic stainless steel. Further the roller 31 is formed by a component made of bearing steels, and the cylinder 30 is formed by a component made of eutectic graphite cast iron of more than 10% of pearlite amount, or flake graphite cast iron of more than 80% of pearlite amount.

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. 1 shows a conventional 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, the wear resistance is insufficient even with eutectic graphite cast iron, gray cast iron, or sintered iron alone as in a conventional cylinder. The present invention has been made to solve such a problem,
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. A rotary compressor having a sliding contact vane, wherein the vane performs quenching and tempering with high-speed steel or stainless steel,
And the roller is bearing steel, and the cylinder is
The vane is formed by combining a mold eutectic graphite iron or a sand eutectic graphite cast iron with a pearlite amount of 10% or more, or an A-shaped flaky graphite cast iron or a sintered iron with a pearlite amount of 80% or more. , And the wear resistance of the roller and the cylinder is improved.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 is a material made of bearing steel in which a roller has a tempering temperature of 200 ° C. or higher.

According to a second aspect of the present invention, the vane material is S
KH51 and a bearing steel with a tempering temperature of 200 ° C. or higher.

According to the third aspect of the present invention, the vane material is S
US440C and a bearing steel with a tempering temperature of 200 ° C. or higher.

The invention according to claim 4 provides a bearing steel SUJ2 in which the roller is tempered at a temperature of 200 ° C. or higher and 400 ° C.
Material.

According to a fifth aspect of the present invention, there is provided a bearing steel SUJ2 having a tempering temperature of 300 ° C. or higher and 500 ° C.
It is a material having a temperature of 300 ° C. or more and 450 ° C. or less after low-temperature nitriding or low-temperature nitrocarburizing after grinding finish.

According to the invention described in claim 6, the cylinder is made of Ti.
The material is a mold eutectic graphite cast iron with an amount of 0.1% or more and 0.13% or less, or a sand eutectic graphite cast iron with a Ti amount of 0.13% or more and 0.20% or less.

According to a seventh aspect of the present invention, the compressor of the present invention is a highly reliable compressor in which the refrigerant is HFC and the refrigerating machine oil is an ester oil.

[0012]

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

(Embodiment 1) FIG. 2 is a longitudinal sectional view of an embodiment of the compressor of the present invention, and FIG. 3 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.

FIG. 3 shows an example of the vane 32 according to the present invention.
SKH51 is used as the material of the first member, and reciprocating motion is performed in the through groove 24. Because of the reciprocating motion, the cylinder 30
An oil film is unlikely to be formed on the through groove 24 and the side of the vane, and severe sliding conditions are obtained. Further, the front end of the vane 32 and the outer peripheral surface 33 of the roller 31 are in a boundary lubricating state with little oil as described above. Under such circumstances, the roller 31 quenched and tempered at a tempering temperature of 350 ° C. is made of material SUJ2, contains a large amount of fine cementite, and operates under the severe sliding condition even under severe sliding conditions.
Has the effect of reducing adhesive wear on the outer sliding surface 33 of the roller 31. The component Cr of the roller 31 is
Cr compound carbide is formed, and the compound carbide is extremely excellent in wear resistance.
The combination of 1 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 made of SUS4
The material quenched and tempered in 40
Is a material SUJ2 quenched and tempered at a tempering temperature of 400 ° C., and the roller 31 is nitrided at 350 ° C. to form a nitrided white layer 34 on an outer peripheral surface 33 of the roller 31. Since a tens of microns of a nitrogen diffusion layer is formed under the nitrided white layer 34, the roller 31
Of the nitrided white layer 34 and the nitrogen diffusion layer 3
5. Due to the presence of fine cementite and double carbides of Cr, the wear resistance of the vane 32 and the roller 31 is very good. When the cylinder is sand-type eutectic graphite cast iron and contains about 20% of pearlite, the wear resistance with the vane 32 is extremely improved. From the above, a highly reliable compressor can be realized. Further, since the roller 31 is nitrided at a low temperature, the finish dimensional accuracy of the roller is good (the roller 31 is quenched and tempered, then ground to obtain dimensional accuracy, and then nitridated). Usually, the nitriding temperature is around 570 ° C.
In normal nitriding, dimensional accuracy is difficult. Thus, when the roller is treated by the low-temperature nitriding, a roller having good dimensional accuracy and good wear resistance can be obtained.

(Embodiment 3) The vane 32 is made of SKH5
1, the roller 31 is made of SUJ2, the roller 31 is made of a nitrided material, and the cylinder has a Ti content of 0.16.
% Of eutectic graphite cast iron containing about 20% of pearlite, the size of the eutectic shell is large, and pearlite is distributed in a mesh on the eutectic cell boundary, and the vane 32 is formed at the pearlite portion. , The wear resistance is very good. From the above, a highly reliable compressor can be realized.

[0020]

The vane is an ingot or sintered material of high speed steel or martensitic stainless steel,
The roller is quenched and tempered with a tempering temperature of 20.
A bearing steel of 0 ° C. or more, and the cylinder is made of eutectic graphite cast iron or sand type eutectic graphite cast iron with a pearlite amount of 10% or more, or an A-shaped flaky graphite cast iron or sintered iron with a pearlite amount of 80% When operating a rotary compressor characterized by comprising the above components, the roller has excellent wear resistance, fine cementite and double carbides of Cr are present, and the roller has excellent wear resistance. By nitriding the roller, and further forming a nitriding white layer and a nitrogen diffusion layer, it becomes a combination of a vane and a roller with extremely excellent wear resistance, and a highly reliable rotary compressor. Become. Also, cylinders of mold eutectic graphite cast iron and sand eutectic graphite cast iron having a pearlite amount of 10% or more, or
Even with a combination of A-type flaky graphite cast iron and sintered iron cylinders and vanes with a pearlite content of 80% or more, the distribution of eutectic graphite cast iron pearlite mesh, flake graphite cast iron pearlite and sintered iron The pearlite greatly improves the wear resistance. For the reasons described above, a highly reliable rotary compressor having excellent wear resistance even in 22 alternative refrigerants can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a conventional example.

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

FIG. 3 is a cross-sectional view of one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 30 Cylinder of the present invention 31 Roller of the present invention 32 Vane of the present invention

Claims (7)

[Claims] 1. A rotary compressor comprising: a cylinder; a roller eccentrically rotating in the cylinder by a shaft; and a vane inserted in a groove formed in the cylinder in a radial direction so as to be able to protrude and retract, and slidably contact with the roller. The vane is an ingot or sintered material of high-speed steel, or martensitic stainless steel, the roller is a quenching and tempering material, a bearing steel having a tempering temperature of 200 ° C. or higher, and the cylinder is Molded eutectic graphite iron or sand eutectic graphite cast iron with a pearlite amount of 10% or more, or A-shaped flaky graphite cast iron or sintered iron with a pearlite amount of 80% or more Rotary compressor. 2. The rotary compressor according to claim 1, wherein the vane is made of an ingot or sintered material of SKH51 and is made of a quenched and tempered material. 3. The rotary compressor according to claim 1, wherein the vane is a SUS440C ingot and is made of a quenched and tempered material. 4. The roller is made of an ingot of SUJ2, and is made of a quenched and tempered material.
2. The method according to claim 1, wherein the material is made of a material having a temperature of 0.degree.
The rotary compressor as described in the above. 5. A rotary compressor comprising: a cylinder; a roller eccentrically rotating within the cylinder by means of a shaft; and a vane inserted removably into a groove formed in the cylinder in a radial direction and slidingly in contact with the roller. The vane is an ingot or sintered material of high speed steel or martensitic stainless steel, and the roller is SU
J2 ingot material, quenched and tempered material with a tempering temperature of 300 ° C or more and 500 ° C or less, after completion of grinding, low-temperature nitriding or low-temperature nitrocarburizing material of 300 ° C or more and 450 ° C or less, the cylinder Is a eutectic graphite cast iron or sand eutectic graphite cast iron with a pearlite amount of 10% or more, or
A-type flake graphite cast iron or sintered iron with pearlite amount of 80
%. A rotary compressor comprising: 6. The cylinder of eutectic graphite cast iron having a Ti content of 0.1% or more and 0.13% or less or a sand eutectic graphite cast iron having a Ti content of 0.13% or more and 0.20% or less. The rotary compressor according to any one of claims 1 to 5, wherein the rotary compressor is made of a material. 7. The rotary compressor according to claim 1, wherein the refrigerant is HFC, and the refrigerating machine oil is an ester oil.