JPH02112685A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To make improvements in workability and abrasion resistance by forming a rocking scroll from a resin composition in use of a glass fiber and an abrasion resisting additive agent as an indispensable. CONSTITUTION:A fixed scroll 1 is made up of such an aluminum material that is lighter in weight and ease of working, while a rocking scroll 2 is formed from a resin composition which is ease of forming and excellent in abrasion resistance. In this case, a glass fiber, polyamide-imide and an abrasion resisting compounding agent serving as this resin composition are mixed at a specified ratio. The rocking scroll 2 formed like this is effective in terms of abrasion resistance as compared with cast iron material and aluminum material.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is one of the compressors used for refrigeration and air conditioning, and has a fixed scroll and a scroll that swings by the rotation of a drive shaft. This invention relates to a scroll compressor that performs compression.

<Prior Art> Conventionally, the fixed scroll that constitutes the compression section of a commonly used scroll compressor and the oscillating scroll that swings relative to it as the drive shaft rotates are made of iron-based or aluminum-based materials. , or a combination of iron-based materials and aluminum-based materials.

A disadvantage of these materials is that the required processing accuracy of the scroll portion leads to high processing costs.

Furthermore, the weight of the oscillating scroll causes energy loss in terms of compressor efficiency, and the high weight of the oscillating scroll also causes large stress on the drive shaft and bearings, which affects the reliability of stable operation over a long period of time. Missing.

<Problems to be Solved by the Invention> As described above, in the conventional technology, it is not possible to achieve high efficiency of the compressor and stable reliability when operating at high speed and high load. , 6 In addition, there are problems such as the high cost of processing the scroll portion, which is a difficult problem to solve.

In view of the above circumstances, the present invention uses aluminum as the material for forming the fixed scroll and the oscillating scroll.

The purpose of this invention is to provide a scroll-type compressor with good workability, wear resistance, etc. that solves the above problems by using a special resin composition mainly made of cast iron and glass fiber.

<Means for Solving the Problems> One aspect of the present invention is that in a fixed scroll and an oscillating scroll part that constitute a compression section of a scroll compressor, the fixed scroll is formed from an aluminum-based material, and the oscillating scroll is made of an aluminum-based material. Heat deflection temperature determined by test method ASTM-D648 with essential glass fibers and anti-wear additives is 200
Another invention is to form a fixed scroll constituting a compression section of a scroll compressor and a fixed scroll of an oscillating scroll section from a cast iron material, and The scroll was tested using test method AS, with the same glass fibers and wear-resistant additives as described above.
It is formed from a resin composition having a heat distortion temperature of 200° C. or higher as determined by TM-D64g.

That is, the fixed scroll is made of an aluminum-based material or a cast iron-based material that can be processed with precision, and the entire oscillating scroll, which is an essential part of the structure of both inventions, is made of glass fiber and wear-resistant additives as essential components. A polyamide-imide resin composition is used. This polyamideimide is a high temperature resistant engineering plastic containing repeating units. Furthermore, in this invention, by filling the polyamideimide with glass fibers, it was possible to improve the strength and achieve a small coefficient of thermal expansion. Furthermore, to improve wear resistance,
graphite powder.

Add carbon fiber, Teflon powder, etc.

In addition, this resin can be used as polyether ether ketone resin,
(2) It may be a resin composition based on polyimide resin and containing glass fiber and an anti-wear additive as essential components. This polyetheretherkent is a crystalline thermoplastic engineering plastic containing repeating units. In addition, polyimide is a type of non-quality high-performance engineering plastic that contains a repeating unit shown by the following formula in its molecule.

Furthermore, in this invention, the high-performance engineering plastics described in (1) and (4) are filled with glass fiber to improve strength, and graphite powder, carbon fiber, Teflon powder, etc. are added to improve wear resistance. do.

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

Embodiment 1 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 faces a high pressure chamber (not shown). A fixed scroll having a scroll tooth portion 1a having a predetermined spiral shape and projecting downward is fitted to the fixed scroll 1, and an oscillating scroll 2 having a scroll tooth portion 2a having a similar spiral shape and 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. In this case, the fixed scroll 1 is made of an aluminum-based material that is lightweight and easy to process, and the oscillating scroll 2 is made of a resin composition that is easy to mold and has wear resistance.

In this case, Table 1 shows the blending ratios of the glass fiber, polyamideimide, and wear-resistant compounding agent constituting the resin composition.

Table 1 For the test pieces obtained in Table 1, the bending strength (kg/c) based on ASTM-D790 was measured as mechanical properties, and the load was 65 kg as sliding properties.

Rotation speed: 740 rpm, lubricant (90% Freon).

Wear resistance was confirmed using an Amsler type abrasion tester under the conditions that Suniso 4GSD 10%) was dropped onto the friction surface, an aluminum material was used as the mating material, and the sliding time was 2 hours. Here, in the Amsler type wear tester, as shown in Fig. 2, a load was applied to the bearing 5 that was in sliding contact with the shaft 4, lubricant was dripped at the oil dripping position P, and the shaft was rotated in the direction of the arrow. In Table 2, the degree of wear is shown in Table 2: No wear (marked ◎), Almost no wear (marked O), Slight wear (marked O),
(Δ mark), and abnormal wear or locking phenomenon (x mark)
It was evaluated in four stages. In addition, as for thermal properties, prismatic test force (vertical 2 nus, In 2 mII, length 10 m
+*) as a sample, the TMA method (manufactured by Shimadzu Corporation: A method of measuring the expansion amount of the sample from room temperature to 150 °C when the heating rate is 5 °C per minute using a thermomechanical analyzer TM-30 ), the linear expansion coefficient was determined.

Further, the density was determined by the underwater substitution method according to JIS 7112.

These measured values are summarized in Table 2.

As is clear from Table 2, Table 3, and Table 2, the examples are more effective in terms of wear resistance than cast iron-based materials and aluminum-based materials.

Example 2 When the resin is a high-performance engineering plastic and is blended with glass fiber and an anti-wear additive, Table 3 shows the blending ratio.

For the test pieces obtained in Table 3, the mechanical properties were AS
Bending strength (kg/cd) based on TM-D790, and a load of 65 kg as sliding characteristics.

Rotation speed: 740 rpm, lubricant (90% Freon).

Under conditions in which Suniso 4GSD 10%) was dropped onto the friction surface, the mating material FC-25. Wear resistance was confirmed using an Amsler type abrasion tester with a sliding time of 2 hours. Here, the Amsler type abrasion tester uses a device similar to the above example (see Figure 2), and measures the degree of wear when rotating the shaft in the direction of the arrow. No wear (Q mark), slight wear (Δ mark).

and abnormal wear or locking phenomenon (marked with an X).

In addition, as for the thermal properties, TM
The linear expansion coefficient was determined by method A.

Moreover, the density was determined by the underwater substitution method according to JIS 7112.

As is clear from Table 4, both Examples 1 and 2 have better wear resistance than cast iron and aluminum materials.

Table 4 Also, as shown in FIG. 3, the linear expansion coefficient can be changed by changing the amount of filler.

<Effects of the Invention> As described above, the scroll type compressor of the present invention is filled with glass fibers and is blended with polyamide-imide resin, polyether ether ketone resin, polyimide resin, etc. to which a compounding agent for wear resistance is added. When a sliding member made of this material is used in an oscillating scroll, even if it is diluted with a fluorocarbon-based refrigerant and has insufficient lubricity, the self-lubricating property of the material itself will not reduce wear resistance. , it can be expected to maintain its performance as a compressor even under the severe conditions that have been strongly desired recently, and to provide stable long-term operation.

In addition, conventional oscillating scrolls are expensive in terms of cutting, but the present invention can eliminate machining and reduce costs. Furthermore, polyamide-imide filled with glass fibers has a low specific gravity and can suppress noise and vibration. Of course, since the fixed scroll is made of aluminum-based material, it is easy to process, which also leads to improved processing accuracy. Further, even if the fixed scroll is formed from a cast iron material, the machining accuracy is improved.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1A is a longitudinal sectional side view of the main part of the compression section of a scroll compressor, and FIG. 1B is a combination of the scroll teeth of a fixed scroll and an oscillating scroll. An explanatory diagram, FIG. 2 is an explanatory diagram of a test using an Amsler type abrasion tester, and FIG. 3 is a graph showing changes in linear expansion depending on the amount of glass fiber filled. 1... Fixed scroll, 1a... Scroll tooth portion,
2... Oscillating scroll, 2a... Scroll tooth portion. Figure 1 (A) Figure 1 (B) Patent applicant Yukio Mata, representative of Sanyo Electric Co., Ltd.

Claims (2)

[Claims] 1. The fixed scroll constituting the compression section of the scroll compressor and the fixed scroll of the oscillating scroll section are made of aluminum-based materials, and the oscillating scroll is made of glass fiber and a wear-resistant additive as required by the test method ASTM-D648.
A scroll type compressor, characterized in that it is formed from a resin composition having a heat deformation temperature determined by 200° C. or higher. 2. The fixed scroll constituting the compression section of the scroll compressor and the fixed scroll of the oscillating scroll section are made of cast iron-based materials, and the oscillating scroll is made of glass fiber and wear-resistant additives in accordance with test method ASTM-D648.
A scroll type compressor, characterized in that it is formed from a resin composition having a heat deformation temperature determined by 200° C. or higher.