JP2627060B2 - Oil-free scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine for compressing, expanding and pumping a fluid, and more particularly to an oilless scroll compressor having a backup function for a tip seal mounted on a spiral body.

[0002]

2. Description of the Related Art In a conventional oilless scroll compressor, the volume of a compression chamber formed between a fixed scroll fixed to a casing and a revolving scroll rotatably supported opposite to the fixed scroll. Are sequentially reduced by the revolving motion of the orbiting scroll.

[0003] In the oilless scroll compressor, there is no air-tightness maintaining effect by the oil film, so that it is very important to improve the efficiency by reducing the leakage flowing in the circumferential direction on the low pressure side along the spiral body around the tip seal. Is important to
As a countermeasure against this, various methods have been conventionally proposed.

For example, it has heretofore been practiced to introduce the pressure of compressed air to the back surface of a tip seal and use it as a pressing force against a sliding surface of the tip seal. A specific example is shown in FIG. A description will be given with reference to a cross-sectional view of the seal portion.

FIG. 1 shows a state in which a tip seal is mounted in a seal groove at a tip end portion of a spiral body provided upright on a scroll. A cut 6 is formed obliquely in the tip seal 1 and a projection 5 is formed at one end thereof. The protrusion 5 contacts the bottom surface of the seal groove 2 to partition gas leakage along the spiral,
It is intended to reduce the sliding surface pressure and the leakage (see Japanese Patent Publication No. 6-81882).

[0006]

The above-mentioned conventional tip sealing method for a scroll requires special processing such as providing a projection on the bottom face of the tip seal or providing a notch. If the tip seal is specially processed, the cost will increase accordingly. Further, since the tip seal is usually made of a soft resin material, when exposed to a high temperature due to compression heat during operation, the tip seal is deteriorated and hardened. When the tip seal hardens, the spring action of the tip seal is lost due to wear of the projections, etc.
There has been a problem that a gap is formed between the bottom of the seal groove and the bottom of the seal groove, thereby increasing leakage, reducing efficiency, and prolonging life.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to perform a special processing on a chip seal, and to use a molded product having a rectangular cross section as it is. It is therefore an object of the present invention to provide an inexpensive and long-life oilless scroll compressor having a tip seal backup function.

[0008]

To achieve the above object, a first aspect of the present invention is to provide a fixed scroll fixed to a casing and a revolving scroll rotatably supported opposite to the fixed scroll. In an oilless scroll compressor in which the volume of a compression chamber formed therebetween is gradually reduced by the revolving motion of an orbiting scroll, a tip made of a self-lubricating material is provided in a seal groove at a tip end of a spiral body provided upright on the scroll. A seal is mounted, and a partition plate formed by bending a heat-resistant thin-film sheet material at a predetermined pitch is laid in a space between the bottom surface of the seal groove and the bottom of the chip seal.

[0009]

A partition plate obtained by bending a heat-resistant thin sheet material at a predetermined pitch is laid between a tip seal mounted on a seal groove at a tip end of a spiral body provided on a scroll and a bottom surface of the seal groove. Thus, the chip seal has a backup function and the bottom surface of the chip seal has no contact with a hard material, so that the life of the chip seal can be prevented from being shortened due to abrasion or the like.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of one embodiment of the present invention. As shown in the drawing, a seal groove 2 is provided at the tip of the spiral body of the scroll member. A chip seal 1 made of a self-lubricating resin having a rectangular cross section is directly mounted in the seal groove 2, and a heat-resistant thin film as shown in FIG. 2 is provided in a gap between the bottom surface of the seal groove 2 and the bottom surface of the chip seal 1. A spiral partition plate 4 having a bent portion 4a formed by bending a sheet material at an appropriate pitch is laid.

When the partition plate 4 having such a bent portion 4a is provided in the gap between the bottom surface of the seal groove 2 and the bottom surface of the chip seal 1, the pressure of the high-pressure fluid is introduced to the bottom surface of the seal, and the partition plate 4 When a pressure acts on the bent portion 4a of the chip seal 1, a sufficient pressing force against the sliding surface 3 of the tip seal 1 is obtained. The high-pressure fluid flows through the bent portion 4a of the partition plate 4 and gradually decreases its pressure toward the low-pressure side. Thereby, the leakage of the fluid to the low pressure side is also reduced.

Further, since the partition plate 4 can appropriately select the bending height, the partition plate 4 can sufficiently follow the wear on the sliding surface of the tip seal. Further, since the sheet material in the form of a thin film acts as a pocket for partitioning the introduction of the high-pressure fluid in the spiral direction, flexibility can be provided. In addition, the partition plate 4 is manufactured using, for example, a Kapton film used as an insulating material, and it is not necessary to perform special processing such as projections or cuts as in the related art, which leads to cost reduction. Tip seal 1
Can be formed with a rectangular cross section that is easy to mold and manufacture, and since there is no contact with a hard material on the bottom surface of the tip seal 1, there is no reduction in the life of the seal due to wear and the like.

As described above, according to the oil-supplying scroll compressor of this embodiment, since the tip seal having a simple structure having a backup function is provided, it is economical and extremely useful in industry.

[0014]

As described above, according to the present invention,
The chip seal can be provided with a backup function with a simple structure.The chip seal can be formed with a rectangular cross section that is easy to mold and manufacture. Further, the bottom of the chip seal does not come into contact with hard materials, so the chip seal is worn due to wear etc. It is possible to provide a non-lubricating scroll compressor which can prevent a reduction in the service life of the oil-cooled type, has a small leakage around the tip seal, and has a high volumetric efficiency.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of the present invention.

FIG. 2 is a perspective view of a partition plate of FIG.

FIG. 3 is a cross-sectional view of a tip seal portion of a conventional scroll compressor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Chip seal, 2 ... Seal groove, 3 ... Sliding surface, 4 ... Partition plate, 4a ... Bending part, 5 ... Protrusion, 6 ... Incision.

Claims (1)

(57) [Claims] The volume of a compression chamber formed between a fixed scroll fixed to a casing and a revolving scroll supported to be revolvably opposed to the fixed scroll is sequentially reduced by the revolving motion of the revolving scroll. In the oilless scroll compressor, a tip seal made of a self-lubricating material is attached to a seal groove at a tip end of a spiral body provided upright on the scroll, and a gap between a bottom surface of the seal groove and a bottom of the tip seal is provided. An oilless scroll compressor characterized in that a partition plate formed by bending a heat-resistant thin-film sheet material at a predetermined pitch is laid in a space.