JPH02125987A - Dry scroll compressor - Google Patents

Abstract

PURPOSE:To restrain grease from degradation due to compression heat by interposing an insulating member between a turning scroll and a turning bearing for supporting the turning scroll and using an engineering plastic material having extremely small coefficient of heat transfer for the insulating member. CONSTITUTION:A suction chamber 8 and a compression chamber 9 are formed between a fixed scroll 1 fixed to a casing 7 and a turning scroll 2 supported by the casing 7 through a self-rotation preventing device 6 or the like. Fluid is sucked and compressed by the turning scroll 2 turned by a shaft 4 with a predetermined eccentricity (e). Thus, an insulating collar 10 of an insulating member is interposed between the turning scroll 2 and a turning bearing 3. An engineering plastic material having extremely low coefficient of heat transfer compared with iron, aluminum, etc., is used for the insulating collar 10 to be formed into a tubular form closed on the upper portion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dry scroll compressor that compresses fluid such as air or gas through relative motion between an orbiting scroll and a fixed scroll.

[Prior Art] A conventional compressor is configured as shown in FIG. 2, for example. In FIG. 0, a dry scroll compressor includes a casing 7, a fixed scroll 1 fixed to the casing 7, Bearing and anti-rotation device 6 in casing 7
An orbiting scroll 2 supported through the orbiting scroll 2, a shaft 4 for orbiting the orbiting scroll 2 with an eccentric amount, that is, a revolution radius e, with respect to the fixed scroll 1, and an orbiting shaft interposed between the shaft 4 and the orbiting scroll 2. It consists of 3 bearings. In addition, the code|symbol 5 in a figure is a balance weight.

In such a configuration, a suction chamber 8 and a compression chamber 9 are formed between the fixed scroll 1 and the orbiting scroll 2,
Fluid is sucked into the suction chamber 8 through the suction port A, and fluid compressed in the compression chamber 9 is discharged from the discharge port B.

[Problem to be Solved by the Invention] In such a compressor, unlike an oil-cooled compressor, the compression heat due to internal compression of the suction fluid is not cooled by injection of cooling oil, so the temperature of the discharge fluid is lower than that of the oil-cooled compressor. The temperature is comparatively high. Therefore, when the internal temperature of the discharge part of the orbiting scroll 2 increases, the heat is transmitted from the orbiting scroll 2 to the orbiting bearing 3 as shown by arrow C, and the temperature of the grease sealed in the bearing 3 rises. The lifespan will be shortened and the reliability of the compressor will be reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dry scroll compressor that prevents the lifespan of grease sealed in a swing bearing from being shortened due to heat of compression.

[Means for Solving the Problems] According to the present invention, in a dry scroll compressor that compresses fluid, a heat insulating member is interposed between an orbiting scroll and an orbiting bearing that supports the orbiting scroll.

Further, according to the present invention, the heat insulating member is made of an engineering plastic material having an extremely small coefficient of thermal conductivity.

The heat insulating member is preferably formed into a cylindrical heat insulating collar closed at the top and covering the outer periphery of the swing bearing and the top surface of the shaft with a gap provided.

[Operation] In the dry scroll compressor configured as described above, the heat of compression generated inside the orbiting scroll is blocked by the heat insulating collar. Therefore, the temperature of the slewing bearing does not rise, and the life of the sealed grease is extended.

[Example] The present invention will be described in detail below with reference to the drawings.

Note that parts in FIG. 1 that correspond to those in FIG. 2 are given the same reference numerals and redundant explanation will be omitted.

In FIG. 1, a heat insulating collar 10, which is a heat insulating member, is interposed between the orbiting scroll 2 and the orbiting bearing 3.

The heat insulating collar 10 is formed into a cylindrical shape with a closed top and made of an engineering plastic material whose coefficient of thermal conductivity is extremely small compared to iron, aluminum, or the like. The collar 10 is fitted into the boss hole 2a of the orbiting scroll 2, the orbiting bearing 3 is fitted into the inner hole, and a gap f is formed between the top surface of the inner hole and the top surface of the shaft 4. ing.

Therefore, the compression heat generated inside the orbiting scroll 2 is prevented from being transmitted to the orbiting bearing 3 as shown by the arrow by the heat insulating collar 10.

[Effects of the invention] Since the present invention is configured as described above, the heat insulating collar prevents the compression heat generated inside the orbiting scroll from being transmitted to the orbiting bearing, suppresses the temperature rise of the orbiting bearing, and It is possible to extend the life of the grease and improve the reliability of the compressor.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIG. 2 is a side sectional view showing a conventional compressor. 1...Fixed scroll 2...Orbiting scroll
3...Swivel bearing 10...Insulating collar patent applicant Ebara Corporation Representative Patent attorney Satoshi Takahashi Toshikuni Tadashi Takahashi

Claims (2)

[Claims] (1) A dry scroll compressor for compressing fluid, characterized in that a heat insulating member is interposed between an orbiting scroll and an orbiting bearing that supports the orbiting scroll. (2) The dry scroll compressor according to claim 1, wherein the heat insulating member is made of an engineering plastic material having an extremely small thermal conductivity coefficient.