JPS62147075A - Rotary compressor - Google Patents

Abstract

PURPOSE:To obtain a rotary compressor which does not suffer from corrosion and damage even if a refrigerant of R13B1 (CBrF3) is used by forming a ceramic film on the surface of a rotor of said rotary compressor for compressing a mixed refrigerant including said R13B1. CONSTITUTION:In the captioned rotary compressor, a rotor 4 driven by a crank shaft 3 is housed in a cylinder 5 while a vane 7 which is elastically in contact with the rotor 4 is provided on the cylinder 5. Since a ceramic film 16 is formed on the outer peripheral face of the rotor 4, even if a refrigerant of R13B1 (CBrF3), etc. which is decomposed due to rise in temp. generating a hydrogen bromide is used, corrosion and damage due to the hydrogen bromide will not occur, fully making the most of advantages of using the refrigerant of R13B1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary compressor for refrigeration and air conditioners such as refrigerators and room air conditioners that uses a mixed refrigerant containing R13B1. It was measured.

Conventional technology Conventionally, R12 (cc12F
2), fluorocarbon-based refrigerants containing chlorine elements such as R22 (C(J?F2H)) have been mainly used.

On the other hand, R13B 1 (CBrF3) was also known to have many advantages as a refrigerant, such as a low boiling point and a large refrigerating capacity.

However, the bromine element (Br) contained in R13B1 has a weaker bonding force with the carbon element (C) than the chlorine element <ce), and decomposes at a relatively low temperature, producing hydrogen bromide (HBr) etc. do.

This corroded the metal materials, organic materials, etc. of the parts used in the compressor, causing increased wear, and reaction products were generated, resulting in fatal damage to the compressor.

Problems to be Solved by the Invention For this reason, R13B1 has a low usable temperature range and its compressor is limited to a reciprocating compressor.

In particular, when R13Bj is mixed with another refrigerant with a higher boiling point and used in a rotary compressor, the discharge temperature increases due to the influence of the heat of compression of the other refrigerant. etc., the heat from sliding is added, resulting in high temperatures and chills.

As a result, the refrigerant decomposes and generates hydrogen bromide, causing wear and tear.

In the past, iron-based materials have been used for rotor materials, but their high coefficient of friction and high reactivity with hydrogen bromide further accelerate the decomposition of the refrigerant.

The decomposed refrigerant soaked the insulating wave membrane and insulating paper in the motor section, causing the motor to burn out.

In view of these drawbacks, the present invention aims to improve the sliding parts of a small and highly efficient rotary compressor, suppress the decomposition of the refrigerant, and make it possible to use R13B1 mixed with the refrigerant in the pond. That is.

Means for Solving the Problems In order to solve the above problems, a ceramic thin film is coated on the surface of the rotor of a rotary compressor that compresses a mixture of R13B1 and a pond refrigerant with a boiling point higher than this.

Function The present invention has a structure in which the surface of the rotor is coated with a ceramic thin film, and in the contact area between the vane and the rotor part where the sliding conditions are the most severe,
Ceramic thin film increases wear resistance and corrosion resistance by m1,
Abrasion of sliding parts can be suppressed.

EXAMPLE A rotary compressor according to an example of the present invention will be described below.

FIG. 1 is a longitudinal cross-sectional view of the rotary compressor, FIG. 2 is a cross-sectional view of the compressor, and FIG. 3 is an explanatory diagram of the rotor in the compressor.

1 and 2, reference numeral 1 denotes a closed container, and inside the container there is an electric motor 2, a crankshaft 3 driven by the electric motor 2, a rotor 4 rotatably fitted to the crankshaft, and a rotor 4 rotatably fitted to the crankshaft. A cylindrical cylinder 5 that houses the rotor 4, a vane 7 whose tip is in contact with the rotor 4 and reciprocates in the cylinder groove 6 to partition the inside of the cylinder into high and low pressures, and a spring 8 that biases the vane 7. , and a compression mechanism section 11 consisting of an upper bearing 9 and a lower bearing 10 that close the upper and lower openings of the cylinder 5 and support the crankshaft 3, and refrigerating machine oil 12.

The compression mechanism section 11 includes a suction pipe 13 and a discharge pipe 14.
connected to the outside of the airtight container 1).

FIG. 3 shows the material structure of the rotor 4, with reference numeral 15 showing an iron-based material part and 16 showing a ceramic thin film part.

The operation of the rotary compressor configured as above will be described.

A crankshaft 3 is driven by the electric motor 2, and a rotor 4 fitted to the crankshaft 3 rotates inside a cylindrical cylinder 5 along its inner circumference. As the rotor 4 rotates, the vane 7
Since it is biased by the spring 8, it reciprocates within the cylinder groove 6 while contacting the outer periphery of the rotor 4.

Due to this movement, the bromine-based refrigerant sucked from the suction pipe 13 is compressed inside the silicator 5, its pressure and temperature rise by 1, and the brominated refrigerant is discharged through the discharge pipe 14.

Due to the gas pressure inside and discharged from the cylinder, the vane 7 is pressed against the rotor 4 and the cylinder groove 6 with a large force and slides.

Refrigerating machine oil 12 seeps into this sliding portion from the cylinder groove 6 and provides a slight lubricating effect.

Although the contact area between the tip of the vane 7 and the rotor 4 is under very severe lubrication, the rotor surface is coated with a ceramic thin film, so even if the oil film is broken, it will not be severely worn or corroded.

Therefore, the reliability of the compressor can be ensured.

Effects of the Invention As described above, the present invention is a rotary compressor that compresses refrigerant containing the bromine element, and the rotor surface of the rotor is coated with a ceramic thin film to improve wear resistance and corrosion resistance.
It is possible to prevent wear of the sliding parts and ensure the reliability of the compressor.

As a result, it is possible to mix R13B1, which has a low boiling point and high capacity, with a refrigerant with a high dl) point in a small and efficient rotary compressor, and configure refrigeration and air conditioning equipment that combines the characteristics of both. Various effects such as these can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a rotary compressor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the rotary compressor, and FIG. 3 is a surface cross-sectional view of a rotor in the rotary compressor. 4... Rotor, 5... Cylinder, 7...
... Vane, 16 ... Ceramic thin film. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 4-m = Rotor δ --- Schilling

Claims (1)

[Claims] Rotary compression uses a cylindrical cylinder, a rotor that rotates eccentrically inside the cylinder, and vanes that partition high and low pressures as compression elements, a ceramic thin film is applied to the surface of the rotor, and a mixture of R13B1 and a refrigerant with a higher boiling point is compressed. Machine.