JPS61155683A - Rotary compressor - Google Patents

Abstract

PURPOSE:to improve wearing resistance of a sliding part and form a device in light weight, by forming a cylinder, rotary shaft and bearing with an iron system alloy, roller with an aluminum system alloy and a blade with ceramic while coating a sliding portion of the rotary shaft with ceramic. CONSTITUTION:A cylinder 6 of complicated shape and an integrally formed main rotary shaft 3, crankshaft 4 and a subrotary shaft 5 of complicated shape are formed by an iron system alloy of excellent workability. While a rotary unit 7 uses an aluminum system alloy for the purpose of light weight in a driving part, further a blade 9 is formed by ceramic. And a sliding portion of the main rotary shaft 3 and a subrotary shaft 5, corresponding to a main bearing 11 and a subbearing 12, applies ceramic coating. As a result, a compressor can place its respectively corresponding sliding part materials in a high load relation of seizure with good wearing resistance while form the driving part in light weight.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a rotary motor that compresses gas by utilizing the fact that the volume of a displacement chamber formed by a rotating body and the inner wall of a cylinder changes with the rotation of the rotating body. It is related to compressors.

[Technical background of the invention and its problems]

Conventionally, various types of compressors have been developed, and rotary compressors are particularly attracting attention as they are compact and highly efficient.

Figures 4 and 5 show the rotary compressor developed in this application. Figure 4 is a vertical cross-sectional view showing the schematic structure of the rotary compressor, and Figure 5 is a cross-sectional view showing the schematic structure of the compression mechanism of the compressor. It is a front view. On the right side of the figure, 101 is a motor ridge 102 is a compression mechanism part, 103 is a main shaft, 104 is a crankshaft, 105 is a subshaft, 106 is a cylinder, 107 is a rotating body eccentrically installed in the cylinder 106, and 08 is a cylinder. 106 is a groove formed in the wall; 109 is a blade that is fitted into the groove 108 and reciprocates following the eccentric rotation of the rotating body 107; 110 is a pressing body that presses the blade 109 against the outer periphery of the rotating body 107; 111 is the main bearing, 112 is the sub-bearing, 113 and 114 are the rotating body 107 and the blade 10'l, thus the cylinder 10.
A low pressure chamber and a high pressure chamber are formed in 6, 115 is a suction gas inlet, and 11G is a compressed gas outlet.

The materials that make up the compression mechanism of this type of rotary compressor are mainly cast iron, and lubricating oil is constantly supplied to these sliding surfaces to prevent seizure and abnormal wear. I'm in the middle of the day.

Moreover, in the refrigerant atmosphere, a chemical reaction occurs between, for example, cast iron and the fluorocarbon gas tank 22, and iron chloride is generated. This iron chloride is the main shaft 103. Crankshaft 104. Subshaft 105. Cylinder 1062 Rotating body 107° Blade 1
09. A solid lubricating film is formed on the cast iron surfaces of the main bearing 111 and the sub bearing 112, and the solid lubricating film is formed between each cast iron along with lubricating oil.
It plays the role of lubrication in the water.

Note that under normal conditions, lubricating oil enters between the sliding surfaces of each component, and this oil film f keeps the components at a small distance.

However, crankshaft 104 and roller 107'
Since the center of gravity of the crankshaft 104 and the rotating body 1 are shifted from the rotational axis, the crankshaft 104 and the rotating body 1
For example, the main shaft 103 is moved by the main bearing 11 due to the centrifugal force of the 07 itself.
1, and the sub-axis 105 is I? It is pressed against the g+@ receiver 112, increasing the chances that the two will come into contact with each other. For this reason, during overload operation or high speed operation, friction occurs between the sliding parts of each component, resulting in the following defects.

(1) The sliding surface pressure increases due to the centrifugal force of the crankshaft 104 and the rollers 107, and adhesive wear and cutting wear ( The phenomenon of seizure caused by abrasive wear (abrasive wear), etc., is more likely to occur.

(2) Occurrence of seizure caused by fusion between sliding parts due to increased frictional heat.

(3) Increased amount of adhesive wear on blades 109, etc., resulting in compressed gas leaks and increased input power due to damage to sliding parts.

(4) Compressed gas leaks due to wear of the sliding parts, resulting in a significant drop in volumetric efficiency.

(5) By forming the crankshaft 104 and rollers 107 from cast iron with high specific gravity and excellent self-lubricating properties, extremely large centrifugal force is generated during high-speed rotation.
Sliding surface pressure due to centrifugal force 1ζ increases and durability decreases significantly.

[Purpose of the invention]

This invention was made to solve the above problems, and provides a highly reliable rotary compressor that can provide stable rotation and compression performance with little wear on the sliding parts even under a wide range of operating conditions. The purpose is to provide.

[Summary of the invention]

In the c-type rm, the cylinder, rotating shaft, and bearing that constitute the compression mechanism of the rotary compressor are made of iron-based alloy, the rotating body is made of aluminum-based alloy, and the blades are made of ceramic, and the bearings and the corresponding parts are made of iron-based alloy. By forming the sliding parts of the rotating shaft with ceramic, the materials of the corresponding sliding parts have good wear resistance and a high seizure load level, and the driving part is lightweight. It is something to do.

〔Effect of the invention〕

According to this invention, by setting the materials between the sliding parts of each component constituting the compression mechanism part in a relationship between ceramic and iron-based alloy, compared to materials of the same type (cast iron → cast iron, ceramic-ceramic), Since it has excellent wear resistance and can obtain a high level of seizure load value, it is possible to reduce the wear of sliding parts and suppress the seizure phenomenon caused by adhesive wear, cutting wear, etc.

By coating the sliding portion of the rotating shaft with ceramic, the wear resistance between the rotating shaft and the bearing can be improved.

By forming the rotating body from an aluminum alloy to reduce the weight of the drive unit, the centrifugal force generated from the eccentric part can be reduced, reducing the load applied to the bearings and improving the wear resistance of the rotating shaft and bearings. can improve sex.

By making the blade, which swings violently, made of ceramic to reduce its weight, the inertial force of the blade can be reduced, and the wear resistance of the blade itself can be improved.

Furthermore, by reducing wear on sliding parts such as blades, leakage of compressed gas can be minimized and volumetric efficiency can be improved.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 and 2, 1 is the motor section, 2 is the compression mechanism section, 3 is the main rotating shaft connected to the motor section 1, and 4 is the main rotating shaft 3.
A crankshaft integrally provided at one end, 5 is the main rotating shaft 3
6 is a cylinder, and 7 is a rotating body that is fitted into the crankshaft 4 and housed in the cylinder 6 to rotate eccentrically. 8 is a cylinder. 6 is a groove formed in the wall; 9 is a flat blade that swings within the groove 8 following the eccentric rotation of the rotating body 7; 10 is a blade provided at the bottom of the groove 8 and attached to the surface of the rotating body 7; A pressing method 11 is provided to close the upper opening of the cylinder 6 and supports the main rotating shaft 3, and 12 is a main bearing that is provided to close the lower opening of the cylinder 6 and supports the auxiliary rotating shaft. A sub-bearing that rotatably supports the shaft 5; 13 and 14 a low-pressure chamber and a high-pressure chamber formed in the cylinder 6 by the rotating body 7 and the blades 9; 15 a refrigerant, such as fluorocarbon gas, compressed by the eccentric rotation of the rotating body 7; A compressed gas discharge port 16 that discharges R22 is a suction gas inlet that introduces the fluorocarbon gas tank 22 into the low pressure chamber 13.

In this embodiment, the complicatedly shaped cylinder 6 constituting the compression mechanism section 2 is made of an iron-based alloy that is low cost and has excellent workability.

Since the main rotating shaft 3, crankshaft 4, and sub rotating shaft 5 are integrally formed and have an extremely complicated shape, they are made of an iron-based alloy with excellent workability, and in particular, the main bearing 11. A main rotating shaft 3 corresponding to the secondary bearing 12. The sliding portion of the sub rotating shaft 5 is coated with a ceramic coating.

In addition, in order to reduce the weight of the drive unit, the rotating body 7 is made of an aluminum alloy (for example, impregnated with molybdenum disulfide + anodized), and the blade 9 has a simple shape so that the direction in which the load is applied is always on one side and the wear area is on the other. Since most of this is concentrated in one place, it is molded in one piece using ceramic.

This material composition is similar between materials of the same type (cast iron - cast iron).

It was constructed based on the results of a wear resistance test between ceramic (ceramic) and different materials (ceramic←cast iron).According to the results of the wear resistance test shown in Figure 3, the wear resistance of different materials is higher than that of materials of the same type. The material between the two materials had better wear resistance, and the seizure load was approximately twice as good as that of the materials of the same type.

Therefore, the material configuration ζ shown in this embodiment includes the main rotating shaft 3 and the main bearing 11. Sub rotating shaft 5 and sub bearing 12, blade 9 and main bearing 11. Since an iron-based alloy-ceramic relationship is established between each sliding portion of the blade 9 and the secondary bearing 12, a sliding portion with excellent wear resistance and a high seizing load level can be obtained.

Further, since the same can be said for the aluminum alloy-ceramic material, the same effect as described above can be achieved in the sliding portion of the rotating body 7 and the blade 9 that have this relationship.

Furthermore, by using an aluminum alloy with a low specific gravity for the rotating body 7 to reduce the weight of the drive section, the influence of centrifugal force generated at the eccentric section can be suppressed, and wear on each sliding section can be suppressed to a minimum. Further, by using ceramic with a small specific gravity for the blade 9, which swings violently, it is possible to reduce the load on the drive unit, reduce the force input, and reduce noise.

Furthermore, in the refrigerant atmosphere, a chemical reaction occurs between the iron-based metal and the fluorocarbon gas R22, producing iron chloride, as in the conventional case. This iron chloride forms a solid lubricating film on the surface of the iron-based alloy, which plays the role of lubrication between the ceramics and reduces the wear of each sliding part.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented with various modifications without changing the gist.

In the above embodiment, the sliding surfaces of the main rotating shaft and the sub rotating shaft were coated with ceramic to improve wear resistance.
A similar effect can be obtained by coating the sliding surfaces of the main bearing and sub-bearing with ceramic.

Furthermore, by using an aluminum-based alloy, which is a composite material of aluminum and carbon, for the rotating body I, it is possible to obtain a rotating body that is lightweight and has a coefficient of thermal expansion similar to that of iron-based metals.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing a schematic structure of an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a schematic structure of a compression mechanism section of the same embodiment, and FIG. 3 is for explanation of the same embodiment. - A graph showing the results of the abrasion resistance test used; FIG. 4 is a vertical cross-sectional view showing the schematic structure of a conventional rotary compressor; FIG. 5 is a cross-sectional view showing the schematic structure of the compression mechanism of the same compressor. 1, 101...Motor section 2,102...Compression mechanism section 3, 103...Main rotating shaft 4,104
... Crankshaft 5.105 ... Sub-rotating shaft 6
, 106...Cylinder 7.107...Rotating body
8,108... Groove 9.109... Blade
10,110... Pressing body 11.111... Main bearing 12,112... Sub bearing 13.113...
Low pressure chamber 14,114-・High pressure chamber 15.115・
... Compressed gas discharge force 16.116 ... Suction gas inlet Fig. 1 Fig. 2 15141: i 4r Fig. 4 Fig. 5

Claims (1)

[Claims] A rotating body rotatably provided within a cylinder, a blade that is constantly in pressure contact with this rotating body by an elastic means, and a rotating body that is integrally provided with a crankshaft built into the rotating body and led out of the cylinder. In a rotary compressor equipped with a shaft and a bearing that supports this rotating shaft,
The cylinder, the rotating shaft, and the bearing are made of iron-based alloy, the roller is made of aluminum-based alloy, the blade is made of ceramic, and the sliding portion of one of the rotating shaft or the bearing is coated with ceramic. A rotary compressor that is characterized by: