JP3602270B2 - Rotary compressor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotary compressor, and more particularly to a rotary compressor having improved vane wear resistance.
[0002]
[Prior art]
In recent years, there has been an increasing demand for NON-CFCs for rotary compressors.
[0003]
In recent years, a rotary compressor described in Japanese Patent Application Laid-Open No. 64-63692 has been known.
[0004]
FIG. 4 shows a structure of a conventional rotary compressor, and FIG. 5 shows a sectional state of a vane of the conventional rotary compressor. 1 is a closed container, 2 is a motor part, 3 is a compressor part. 4 is a vane, 5 is a roller, 6 is a cylinder, and 7 is a shaft.
[0005]
The surface layer of the vane 4 has a nitride layer 8 in order to reduce the hardness difference between the base material and the coating layer 9 formed by the ion plating process, and further has a nitride of a metal such as Cr or the like thereon. The diffused coating layer 9 is formed by ion plating. Usually, in the process of performing an ion plating process, a preliminarily nitrided base material is preliminarily cleaned, and then an ion bombardment process is performed.
[0006]
The ion bombardment process is to put the pre-cleaned base material in a vacuum vessel, suck the vacuum to a predetermined degree of vacuum, and then perform ion etching to etch the base material surface and heat the material to be coated. . The base material whose surface is cleaned and heated in this way is subjected to ion plating.
[0007]
In the ion plating process, usually, a metal to be evaporated is set as a target in a vacuum vessel, and a positive voltage is applied to the inside of the vacuum vessel and a negative voltage is applied to the target, and an arc discharge is generated on the target surface. Melts and evaporates metal.
[0008]
Furthermore, the vaporized metal is ionized by colliding with electrons and the like due to arc discharge, is attracted to the vacuum container applied with negative energy with a large energy, and collides with a product fixed to a jig in the vacuum container to coat. The coating layer usually has a Vickers hardness of Hv 1500 to 2000.
[0009]
In the rotary compressor configured as described above, when the compressor unit 3 is driven by the electric motor unit 2, the roller 5 attached to the eccentric portion of the shaft 7 is eccentric along the inner wall of the cylinder 6. The vane 4 which rotates and contacts the outer peripheral surface of the roller 5 partitions the compression chamber into a high-pressure chamber and a low-pressure chamber, and performs compression. At this time, particularly, the tip of the vane in contact with the outer periphery of the roller is in a severe sliding contact state of line contact. However, the vane is prevented from being worn by applying ion plating to the vane and increasing the hardness of the coating layer 9. .
[0010]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, in the ion bombardment process, when the vane is heated to a certain temperature or higher, nitrogen in the nitrided layer shown in FIG. The hardness difference from the coating layer formed by the coating process is increased. At this time, even if the hardness of the coating layer is high and the hardness of the nitrided layer is low, the tip of the vane is microscopically distorted at the contact surface between the vane and the roller, and the wear resistance is reduced due to repeated fatigue. Had.
[0011]
An object of the present invention is to solve the above-mentioned conventional problems and to improve the wear resistance of the vane.
[0012]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is to prevent a decrease in hardness of a nitride layer. Thereby, the wear resistance of the vane itself can be improved.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention is intended to prevent a decrease in the hardness of the nitride layer by suppressing the heating of the vane by controlling the temperature of the nitride layer so as not to exceed the nitriding temperature when performing ion bombardment treatment on the vane. This has the effect of reducing the occurrence of microscopic distortion of the tip of the vane.
[0014]
【Example】
An embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the conventional example are denoted by the same reference numerals, and detailed description will be omitted.
[0015]
FIG. 1 shows a structure of a rotary compressor according to an embodiment of the present invention, and FIG. 2 shows a sectional view of a vane of the compressor. Reference numeral 10 denotes a vane on which a nitriding layer 11 having a hardness of Hv 1050 or more is provided in advance, and a coating layer 9 formed by ion plating after performing ion bombardment. When performing ion bombardment treatment, by controlling the temperature of the nitrided layer so that the temperature of the vane does not exceed the nitriding treatment temperature, the method of suppressing the heating of the vane prevents the nitrided layer from becoming porous, This prevents a decrease in the hardness of the nitrided layer. FIG. 3 shows the relationship between the hardness of the nitrided layer of the vane and the amount of wear. There is a correlation between the hardness of the nitride layer and the amount of wear in FIG. 3, and it can be said that as the hardness of the nitride layer decreases, the amount of wear increases.
[0016]
As described above, when performing ion bombardment treatment, by controlling the temperature of the nitrided layer, it is possible to prevent a decrease in the hardness of the nitrided layer, thereby reducing the microscopic distortion at the tip of the vane, and thereby reducing the contact area. And the wear resistance of the vane itself is improved.
[0017]
Further, at this time, by reducing the difference in hardness between the nitrided layer and the coating layer, there is also an effect that distortion is reduced and peeling is difficult.
[0018]
【The invention's effect】
ADVANTAGE OF THE INVENTION As mentioned above, according to this invention, the abrasion resistance of a vane itself is improved by controlling a nitride layer temperature at the time of performing an ion bombardment treatment, and setting a nitride layer hardness to Hv1050 or more in Vickers hardness. Effects can be obtained.
[Brief description of the drawings]
1 is a cross-sectional view of a rotary compressor according to an embodiment of the present invention; FIG. 2 is a cross-sectional view of a vane of the rotary compressor; Characteristic diagram shown in FIG. 4 is a sectional view of a conventional rotary compressor. FIG. 5 is a sectional view of a vane of a conventional rotary compressor.
DESCRIPTION OF SYMBOLS 1 Closed container 2 Electric motor part 3 Compressor part 5 Roller 6 Cylinder 7 Shaft 9 Coating layer 10 Vane 11 Nitride layer

Claims (1)

A shaft, a roller attached to an eccentric portion of the shaft, a cylinder accommodating the roller, and a vane accommodated in a groove of the cylinder and having a tip end slidably in contact with the outer periphery of the roller, the vane A nitride layer is provided on the surface of the substrate, and an ion plating process is further performed thereon. Before the ion plating process, the temperature of the nitride layer is adjusted so that the temperature of the vane does not exceed the nitriding temperature. by ion bombardment to manage, rotary compressor Vickers hardness of the nitride layer after said ion bombardment process is characterized in that at Hv1050 or more.

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