JPH09158854A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a clearance between a chip seal and a scroll bottom surface so as to reduce leakage of compressed air by providing a step difference shorter than the bank part of the groove of the teeth tip of a lap on the bottom surface of a scroll, and heightening the height of the step difference to the extent which is not brought in contact with the teeth tip of the lap. SOLUTION: In a scroll compressor formed in such a constitution that a compression space is formed by the lap of a slewing scroll and a fixed scroll, compression is continuously carried out by slewing-operating the slewing scroll, and a fluid is discharged, a chip seal 6 is arranged in a groove 12 arranged on the tip of one scroll lap 7, and it is brought in contact with the bottom surface 11 of the other scroll. A step difference 9 is arranged on the root part of the scroll lap 10 of the other scroll at a few clearance between the bank part 8 of the groove 12 and the side surface of the chip seal 6. It is thus possible to reduce a clearance so as to prevent leakage of compressed air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swirl type positive displacement compressor for compressing gas while reducing the volume of a compression working chamber, and in particular, a crescent-shaped compression chamber is provided by a scroll member formed in a spiral shape. The present invention relates to a scroll compressor that forms a compression chamber by using a tip seal on a tooth tip of a scroll wrap among scroll compressors that are formed.

[0002]

2. Description of the Related Art As a scroll compressor is conventionally known, the basic operation principle will be described. In this compressor, two scroll members provided with upright spiral wraps on an end plate are meshed with each other, and one scroll member is relatively rotated with respect to the other scroll member while being restrained from rotating. Then, the gas is compressed from the outer peripheral portion of the scroll member toward the central portion. At this time, a crescent-shaped compression chamber is formed.The compression chamber is partitioned between the side surfaces of the two scroll wraps and between the tooth tops and the bottom surfaces of the two scroll wraps. Prevention plays a major role in the performance of scroll compressors. In particular, it is difficult to maintain the sealing property between the tooth top and the bottom surface.

As disclosed in Japanese Patent Application Laid-Open No. 63-136284, many proposals have been made for the structure of the tip seal in the prior art, but no proposal has been made for the groove on the bottom surface.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a seal structure of a scroll compressor using a seal material,
In addition to the shape of the sealing material, the shape of the groove on the bottom surface was also examined.

An object of the present invention is to provide a scroll compressor using a tip seal, for example, an oil-free scroll compressor having a better seal structure and excellent performance.

[0006]

The technical means of the present invention will be described.

In the scroll compressor, a compression chamber is formed by a wrap of an orbiting scroll and a fixed scroll, and the orbiting scroll makes an orbiting motion to progress compression. In a scroll compressor having a structure using a tip seal, a seal material is provided on the wrap addendum to seal between the tooth bottom and the wrap addendum to prevent leakage of the compression space. At this time, since the sealing material is fitted in the groove provided at the tip of the wrap tooth, a gap is formed between the bank portion of the groove and the side surface of the tip seal, and the compressed air is more likely to leak from here. Therefore, a step slightly shorter than the bank portion of the groove of the scroll wrap tooth tip is provided on the bottom surface of the scroll, and the height of the step is made high enough not to contact the wrap tooth tip.

By making the width of the step provided on the bottom surface of the wrap slightly larger than the width of the bank of the groove into which the sealing material is inserted, the side surface of the step is brought into contact with the sealing material, thereby pressing the sealing material against the side surface of the groove on the bottom surface. The structure.

By making the width of the step provided on the bottom surface of the lap slightly larger than the width of the bank of the groove into which the sealing material is fitted, the side surface of the step is brought into contact with the sealing material, thereby pressing the sealing material against the side surface of the groove on the bottom surface. The sealing material moves to the bottom surface of the wrap due to the pressing force, and comes into contact with it.

A peelable layer made of a solid lubricant or the like is provided on the bottom surface, and a step is naturally formed by contact with the sealing material.

In the scroll compressor, a compression chamber is formed by a wrap of the orbiting scroll and the fixed scroll, and the orbiting scroll orbits to perform compression. In a scroll compressor having a structure using a tip seal, a seal material is provided on the wrap addendum to seal between the tooth bottom and the lap addendum to prevent compressed air from leaking. At this time, since the sealing material is fitted in the groove provided at the tip of the lap tooth, a gap is formed between the bank portion of the groove and the side surface of the tip seal, and the compressed air is more likely to leak from here. Therefore, a step slightly shorter than the bank portion of the groove of the scroll wrap tooth tip is provided on the bottom surface of the scroll, and the height of the step is increased to such an extent that it does not contact the wrap tooth tip to reduce the gap and prevent leakage.

Further, the width of the step provided on the bottom surface of the lap is made slightly larger than the width of the bank of the groove for inserting the sealing material, so that the side surface of the step is brought into contact with the sealing material, and thereby the sealing material is attached to the side surface of the groove on the bottom surface. The structure that presses against the side surface of the step and the sealing material prevents leakage of compressed air.

Further, by making the width of the step provided on the bottom surface of the wrap slightly larger than the width of the bank of the groove for inserting the sealing material, the side surface of the step is brought into contact with the sealing material, whereby the sealing material is attached to the side surface of the groove on the bottom surface. The sealing material moves to the bottom surface of the wrap due to the pressing force, and by making it contact, the compressed air leakage between the side surface of the step and the sealing material and the leakage between the bottom surface and the sealing material are prevented. Since the force that is constantly pressed toward the bottom surface acts, the entire sealing material easily contacts the bottom surface.

Further, a peelable layer made of solid lubricant or the like is provided on the bottom surface, and a step is naturally formed by the contact of the sealing material to reduce the gap and prevent leakage.

[0015]

Embodiments of the present invention will be described in order below.

FIG. 1 shows the relationship between the seal structure of the scroll compressor and leakage.

The scroll compressor is arranged with the orbiting scroll 1 and the fixed scroll 2 fitted together to form a crescent-shaped compression chamber. At this time, between the compressors A, B, and C, compression leakage occurs between the compression chambers A3 and B4 in the tangential direction of the scroll wrap curve, and between the compression chambers A3 and C5 in the normal direction. Occurs.

FIG. 2 shows an embodiment.

In FIG. 2, the tip seal 6 is arranged in the groove 12 provided at the tip of the scroll wrap 7, and the bottom surface 1
Is in contact with 1. A step 9 is formed at the base of the scroll wrap 10 with respect to the bank 8 of the groove and the side surface of the tip seal 6.
It is provided with a slight gap. This reduces the gap and prevents compressed air from leaking.

FIG. 3 shows a second embodiment.

In FIG. 3, the tip seal 13 is arranged in the groove 19 provided at the tip of the scroll wrap 14 and is in contact with the bottom surface 18. A step 16 is provided at the base of the scroll wrap 17 so as to be slightly in contact with the side surface of the tip seal 13 with a slight gap from the bank portion 15 of the groove. This can further prevent leakage of compressed air between the side surface of the step 16 and the tip seal 13.

FIG. 4 shows a third embodiment.

In FIG. 4, the tip seal 20 is disposed in the groove 27 provided at the tip of the scroll wrap 21 and is in contact with the bottom surface 20. A step 23 is provided at the base of the scroll wrap 25 so as to make a slight gap with respect to the bank portion 24 of the groove and to contact the side surface of the tip seal 20. The groove 27 is provided with a tapered portion 22 on its bottom surface. The tip seal 20 has a step 23
When contacted with, the bottom surface of the tip seal 20 contacts the tapered portion 22 and is pressed against the bottom surface 26. This causes the step 23
Of compressed air between the side and the side and the tip seal 20, bottom 2
6 and the tip seal 20 are prevented from leaking, and a force that is constantly pressed against the tip seal 20 toward the bottom surface 26 acts, so that the entire tip seal 20 easily contacts the bottom surface 26, and leakage of compressed air can be prevented. .

FIG. 5 shows a fourth embodiment.

In FIG. 5, the tip seal 28 is disposed in the groove 34 provided at the tip of the scroll wrap 29 and is in contact with the bottom surface 33. A film is formed on the root of the scroll wrap 32 with a solid lubricant such as MoS2. When the tip seal 28 makes repeated contact, the coating film peels off, and a step 31 having a minute gap is formed between the bank portion 30 of the groove and the side surface of the tip seal 28, so that leakage of the compression space can be prevented.

[0026]

According to the present invention, in a scroll compressor which uses a tip seal on the tip of the scroll wrap to seal the compression chamber, the gap between the tip seal and the bottom of the scroll is reduced to reduce the leakage of compressed air. Therefore, it is possible to prevent the discharge temperature from rising and the load from increasing due to the re-pressure heating. Thereby, the life of the member is prevented from being shortened, and the performance as the scroll compressor is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a seal structure.

FIG. 2 is an explanatory diagram of an example of a seal structure.

FIG. 3 is an explanatory view of a second embodiment of the seal structure.

FIG. 4 is an explanatory view of a third embodiment of the seal structure.

FIG. 5 is an explanatory view of a fourth embodiment of the seal structure.

[Explanation of symbols]

6 ... Tip seal, 7 ... Scroll wrap, 8 ... Bank part, 9 ... Step, 10 ... Scroll wrap, 11 ... Bottom surface,
12 ... Groove.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Machida 502 Kintatemachi, Tsuchiura, Ibaraki Prefecture

Claims (1)

[Claims] 1. An orbiting scroll and a fixed scroll are arranged in a fitted state, and when the orbiting scroll orbits, a compression working chamber is formed between the respective wraps to compress gas, and the orbiting scroll and the orbiting scroll are provided. In a scroll compressor in which a sealing material having elasticity of a polymeric material is fitted into a groove provided in the tip portion of the wrap of the fixed scroll, the bottom surface of the scroll is slightly more than the bank portion of the groove of the tip of the wrap. A scroll compressor, wherein a short step is provided, and the height of the step is increased to such an extent that it does not come into contact with the tip of the wrap.