JPH02112686A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To make the abatement of working loss and the promotion of lightweightiness achievable by forming a scroll part solidly with a resin composition using a carbon fiber and carbon powder as an indispensable ingredient by means of injection molding, compression molding or the like. CONSTITUTION:As an indispensable ingredient for a resin composition forming a fixed scroll 1 and a rocking scroll 2, a carbon fiber, which enhances the extent of mechanical strength while makes a linear expansion coefficient smaller, and carbon powder which improves abrasion resistance as a self- lubricant both are used. With this, it comes to such one as fully resistible to high temperature at a compression part and, what is more, both these scrolls 1, 2 are made up of resin so that a coefficient of thermal expansion can be made into sameness. In addition, abrasion resistance in a sliding part with a drive shaft 2 and another sliding part between both scroll parts is excellent, and lightweightiness is promoted. Moreover, solid forming for these scroll parts can be done by normal injection molding and compression molding, thus cutting work becomes disused.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is one of the compressors used in various fields such as refrigeration and air conditioning. The present invention relates to a scroll type compressor for compressing a medium.

<Prior Art> The configuration of a fixed scroll, which is the compression part of a commonly used scroll compressor that compresses media such as gas and liquid, and an oscillating scroll that swings in opposition to the fixed scroll by the rotation of a drive shaft is as follows. Both are made of cast iron material, aluminum material, or a combination thereof.

A disadvantage of these materials is that they lead to high processing costs for the scroll portion. Furthermore, regarding the efficiency of the compressor, the weight of the oscillating scroll causes energy loss, and the high weight of the oscillating scroll causes large stress on the drive shaft and bearings, making it unreliable for long-term stable operation. Become something.

<Problems to be Solved by the Invention> In other words, in the conventional technology, it cannot be said that sufficient reliability is ensured for increasing the efficiency of the compressor and for operation at high speed and high load. In addition, there are other problems such as the high cost of processing the scroll portion, which remains to be solved.

In view of the above-mentioned circumstances, the present invention aims to provide a high-quality scroll compressor by reducing processing loss and weight reduction of fixed scrolls and oscillating scrolls.

Means for Solving the Problems> The present invention provides a fixed scroll and an oscillating scroll part constituting the compression part of a scroll compressor, which contain carbon fiber and carbon powder as essential components, and which are determined by test method ASTM-D648. In this method, the scroll portion is integrally formed by injection molding, compression molding, etc. using a resin composition having a heat deformation temperature of 200° C. or higher.

<Function> As an essential component of the resin composition that forms the fixed scroll and the orbiting scroll as described above, carbon fiber and self-lubricating agent that increase the mechanical strength of the resin and reduce the coefficient of linear expansion improve the wear resistance of the resin. Uses carbon powder that improves properties.

This allows it to withstand high temperatures in the compression section.
Since the scroll that swings in opposition to the fixed scroll is both made of resin, the coefficient of thermal expansion is the same, and the abrasion resistance of the sliding part with the drive shaft and the sliding part of the opposing scroll part is improved. Excellent and lightweight. In addition, the scroll portion of this scroll can be integrally molded by ordinary injection molding or compression molding, eliminating the need for cutting work required for metal-based materials.

In this case, regarding the resin composition used in the present invention, the resin matrix is preferably 1) polyetheretherketone, 2) polyimide, 2) polyamideimide, 2) polyphenylene sulfide, 2) aromatic polyester, 2) polyether sulfone, and 3) polyetherimide.

Further, the carbon fiber which is an essential component in the present invention is preferably one made of acrylic fiber, pitch, etc. and having a fiber length of about 0.1 to 10. The carbon fibers are preferably surface-treated with epoxy resin, polyamide resin, etc. in order to improve adhesion to the resin matrix, but the carbon fibers are not particularly limited thereto. On the other hand, the carbon powder, which is another essential component in the present invention, can be used even if it has a complete graphite structure or is amorphous carbon. In the case of graphite, it can be either natural graphite or artificial graphite. . Also, amorphous carbon is coke.

Any carbon-like substance such as gas carbon or carbon black can be used, and the average particle size is 2.
~100 μm is preferred. In addition, in the resin composition,
Molybdenum disulfide and fluororesin within a range that does not impede the main purpose of the invention.

Reinforcing materials such as glass fiber, boron fiber, silicon carbide fiber, and glass cloth may also be blended.

<Example> The present invention will be described below based on the drawings of the example.

First, FIGS. 1A and 1B are cross-sectional views showing the compression section of a scroll compressor and explanatory views of the combination of scroll teeth of a fixed scroll and an oscillating scroll, and 1 is a predetermined position facing a high pressure chamber (not shown). A fixed scroll having a spiral-shaped scroll tooth portion 1a projecting downwardly is fitted to the fixed scroll 1, and an oscillating scroll 2 having a similar spiral-shaped scroll tooth portion 2a projecting upwardly is fitted to the fixed scroll 1 to form a compression section. 3
is a crankshaft for eccentrically rotating the oscillating scroll 2.

Table 1 shows examples and comparative examples of resin compositions constituting the fixed scroll 1 and the orbiting scroll 2.

In Examples 1 and 2 in the same table, the fixed scroll and the oscillating scroll were manufactured using a composition in which the resin matrix was made of polyetheretherketone, and a composition in which the resin matrix was made of polyimide, respectively. Moreover, Comparative Examples 1 and 2 are cast iron-based materials and heat-treated aluminum materials, respectively.

The test method will now be described. Density is measured by the underwater displacement method. In addition, the sliding characteristics are as follows: load 65kg, rotation speed 7
Confirmation was performed using an Amsler type wear tester under the conditions of lubrication (Suniso 4GSD 10% + Freon 90%) using 4 Orp* and a sliding time of 2 hours. A schematic diagram of the measurement principle of this Amsler type abrasion tester is shown in Fig. 2. Regarding the degree of wear when the shaft 4 is rotated in the direction of the arrow with a load applied to the bearing 5 that slides on the shaft 4 and lubricant is dripped at the oil dripping position P, there is almost no wear as shown in the table below. , 0 mark), slight wear (△ mark), and abnormal wear or locking phenomenon (x mark).

Thermal properties were measured using the TMA method (
Using a thermomechanical analyzer, the coefficient of linear expansion was determined by the 11P1 method of determining the amount of expansion of a sample between room temperature and 150°C. Further, the heat distortion temperature was determined under a load of 18.5 kg/C- according to ASTM-D648.

As is clear from Table 1, both Examples 1 and 2 have lower densities than Comparative Examples 1 and 2, leading to weight reduction. Also,
It can be seen that it has excellent properties as well.

<Effects of the Invention> As described above, the compression section of the scroll compressor of the present invention is
By forming it from a resin composition containing carbon fiber and carbon powder as essential components, it is possible to improve efficiency by reducing weight, reduce vibration, and improve reliability. In addition, integral molding eliminates the need for processing, achieving the initial objective.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1A is a schematic cross-sectional view of the compression section of a scroll compressor, and FIG. 1B is an explanatory diagram of the combination of the fixed scroll and the scroll teeth of the oscillating scroll. , FIG. 2 is an explanatory diagram of a test using an Amsler type abrasion tester. 1... Fixed scroll, 2... Oscillating scroll, 4
...shaft, 5...bearing. Figure 1 (A) Figure 1 (B)

Claims (1)

[Claims] 1. The fixed scroll and the oscillating scroll part that constitute the compression part of a scroll compressor are made of a resin composition containing carbon fiber and carbon-based powder as essential components and having a heat distortion temperature of 200°C or higher as determined by test method ASTM-D648. A scroll type compressor characterized by the following: