JPS61205383A - Compressor - Google Patents

Abstract

PURPOSE:To make it unnecessary to heat a rotary shaft to high temperature, so as to prevent this shaft from being deformed, and make it unnecessary to repair this shaft through such as grinding, by forming a coating layer from a material which can be coating-processed at low temperature, on the rotary shaft which has a crank part. CONSTITUTION:An electric motor in a sealed casing and a compressor which is connected with this electric motor directly, are set. A rotary shaft 20 of this compressor, which has a crank part 21, is formed of such as a plastically processed mold of a steel tube. Then, a coating layer 22 made from amorphous silicone nitride or amorphous boron nitride, is formed on the surface of said rotary shaft 20. This coating layer 32 is formed through coating-processing by a plasma CVD method, in an atmosphere at about 200 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a compressor that is incorporated into, for example, a room cooler.

[Technical background of the invention and its problems]

This kind of compressed tuna (e.g. 〇-tari compressa)
As shown in FIG. 3, the motor is comprised of an electric motor 2 in a sealed casing 1 and a compression bag N3 directly connected to the electric motor. One end of a shaft 7 having a diameter 6 is inserted and fixed. The shaft 7 is a main bearing 8 and a sub-bearing 8 of the compression device 3.
is supported by

That is, the compression device 3 includes a main bearing 8 and a sub-bearing 9 arranged to sandwich the crank part 6, and a cylinder 10 located between these. Blade 12 that comes into elastic contact with this roller 11
A compression chamber is formed within the cylinder 10 by the cooperation of the two.

On the other hand, the shaft 7 having the crank part 6 is supported by a main bearing 8 and a sub-bearing 9, and since the sliding contact parts are subject to wear, a ceramic coating such as alumina (Al2O2) is applied to improve wear resistance. It is being considered to install this on the sliding contact area.

However, in order to apply the above-mentioned ceramic coating to the sliding contact portion of the shaft 7, the shaft 7 must be heated in an extremely high temperature atmosphere. Therefore, as shown in Fig. 4, the solid line when heated and the broken line when cooled. It transforms like this.

When such deformation occurs, the axes of the shaft and the bearing no longer match, so the shaft must be ground to correct it, and if such grinding is performed, the ceramic coating becomes meaningless.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide a compressor that prevents the occurrence of deformation of a shaft having a crank portion, and in which a strong coating is provided on the surface of the shaft.

[Summary of the invention]

The present invention improves the wear resistance of the shaft by providing a coating layer of amorphous silicon or amorphous boron nitride on the surface of the shaft having the crank part, which is supported by the main bearing and the sub-bearing of the compression device. This is a compressor designed to improve performance.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 20 denotes a shaft having a crank portion 21 supported by the main bearing 8 and the sub-bearing 9 of the device 3,
This shaft 20 is integrally formed with a crank portion 21 by plastically working a copper tube by bulging. A coating layer 22 of amorphous silicon or amorphous boron nitride is provided on the surface of this shaft 20.

The coating layer 22 is formed by coating the shaft 20 in an atmosphere of about 200° C. using a plasma CVD method. The time required for this coating process is about 30 minutes.

Thus, the shaft 20 provided with the coating layer 2I2 on its surface is assembled so as to be pivotally supported by the main bearing 8 and the sub-bearing 9 of the compression device 3 in the usual manner. Because there is no deformation in @20, and
Since the wear resistance of m is high, the amount of wear is small, and therefore the service life of the shaft is long, and the operating time required until the device is replaced can be extended.

FIG. 2 shows another embodiment of the present invention, in which the crank part 30 and the shaft part 31 are formed separately, and the shaft part 31 is fitted into a hole 32 provided in the crank part 30. This forms an axis. In this case, the amorphous silicon or amorphous boron nitride film may be formed separately and then combined.
Furthermore, it goes without saying that a coating layer may be provided after the crank part 30 and the shaft part 31 are assembled together.

〔Effect of the invention〕

As described above, according to the present invention, there is no need to heat the shaft to a temperature when providing a coating layer on the surface of the shaft, so there is no deformation of the shaft, and therefore there is no need to modify the shaft during assembly. Moreover, since the Wi layer has excellent durability, the useful life of the device is considerably longer than that of conventional devices.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a shaft supported by a compression device provided in a rotary compressor according to the present invention, Fig. 2 is an exploded perspective view showing another embodiment of the invention, and Fig. 3 is a sectional view of the rotary compressor. , FIG. 4 is a diagram showing thermal deformation of a shaft supported by a compression device. 1... Sealed casing, 3... Compression @ placement, 8...
Main bearing, 9... Sub-bearing, 20... Shaft, 21... Clank portion, 22... Covering layer. Applicant's agent Setsu Ino No. 1 Figure 2 Figure 3 Procedural amendment November 9, 1985

Claims (1)

[Claims] 1. In a compressor having an electric motor in a sealed casing and a compression device directly connected to the electric motor, a coating layer of amorphous silicon or amorphous boron nitride is provided on the surface of a shaft having a crank portion of the compression device. A compressor characterized by being provided with. 2. The compressor according to claim 1, wherein the shaft having the crank portion is formed of a plastically worked molded copper tube.