JP2934556B2 - Scroll type fluid machine - 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 type fluid machine used as a compressor or an expander.

[0002]

2. Description of the Related Art FIG. 5 is a longitudinal sectional view of a conventional scroll compressor, and FIG. 6 is a perspective view of a scroll used in the compressor. The closed housing 1 comprises a cup-shaped main body 2 and a front end plate 4 fastened to the main body by bolts 3. The rotating shaft 7 passes through the front end plate 4 and is rotatably supported by the front end plate 4 via bearings 8 and 9. Sealed housing 1
The fixed scroll 10 and the orbiting scroll 14 are provided inside.

[0003] The fixed scroll 10 has an end plate 11 and a spiral wrap 12 erected on the inner surface thereof.
1 is fastened to the cup-shaped main body 2 by bolts 13. Then, a concave groove 41 shown in FIG. 6 is formed along the spiral on the distal end surface of the spiral wrap 12.
A spiral tip seal 17 is fitted and disposed therein.

The orbiting scroll 14 has an end plate 15 and a spiral wrap 16 erected on the inner surface thereof. The spiral wrap 16 has substantially the same shape as the spiral wrap 12, and has a tip end. The surface has a concave groove 42 along the spiral.
A spiral tip seal 18 is fitted and disposed in the concave groove 42.

[0005] Orbiting scroll 14 and fixed scroll 10
Are eccentric to each other by twice the revolving radius, and 18
The tip seal 17 is in close contact with the inner surface of the end plate 15, the tip seal 18 is in close contact with the inner surface of the end plate 11, and the spiral wrap 12
And 16 have line contact with each other at a plurality of points. In this way, the plurality of compression chambers 19a and 19b that are substantially point-symmetric with respect to the center of the spiral are limited.

A drive bush 21 is rotatably accommodated in a cylindrical boss 20 formed at the center of the outer surface of the end plate 15 via a slewing bearing 23. The drive bush 21 has an eccentric hole formed therein. An eccentric pin 25 projecting from the inner end of the rotating shaft 7 is rotatably fitted in the hole 24.
A balance weight 27 is fixed to the drive bush 21. Between the outer peripheral edge of the outer surface of the end plate 15 and the inner surface of the front end plate 4, a rotation preventing mechanism 40 also serving as a thrust bearing is disposed. Rotating shaft 7
The sub balance weight 5 is fastened to the boss 7a by a plurality of bolts 6.

In this apparatus, when the rotating shaft 7 is rotated, the eccentric pin 25, the drive bush 21, and the swing bearing 2
3. The orbiting scroll 14 is driven via the boss 20,
The orbiting scroll 14 revolves in a circular orbit having a revolving orbital radius while being prevented from rotating by the rotation preventing mechanism 40.

On the other hand, when the orbiting scroll 14 revolves orbitally, the line contact portion between the spiral wraps 12 and 16 gradually moves toward the center of the spiral.
9a and 19b move toward the center of the spiral while reducing the volume. Along with this, the gas flowing into the suction chamber 28 through the suction port (not shown) is taken into the compression chambers 19a and 19b from the outer terminal openings of the spiral wraps 12 and 16 and is compressed and becomes the central chamber 22. From here, the discharge valve 30 is pushed and opened through a discharge port 29 formed in the end plate 11 of the fixed scroll 10, and discharged to a discharge cavity 31 limited by the end plate 11 and the housing 1. Exit via exit.

[0009]

In the conventional scroll type fluid machine described above, the fixed scroll 10 and the orbiting scroll 14 are arranged such that the end surfaces of the spiral wraps 12, 16 are opposite to each other as shown in FIG. The center seal 22 is mounted so as to have a gap c with the inner surfaces of the plates 15, 11, and the tip seals 17, 18 fitted in the concave grooves 41, 42 on the high pressure side under the orbital movement of the orbiting scroll 14.
Rises from the grooves 41 and 42 by the gas pressure of
The compression chambers 19a,
19b is sealed.

However, when the tip seals 17 and 18 float, a passage 43 is formed between the back surface and the bottom surfaces of the concave grooves 41 and 42, and the high-pressure gas in the center chamber 22 passes through the passage 43 and passes through the arrow X. Suction chamber 28 on the low pressure side along
Leaked out, and the compression performance deteriorated.

On the other hand, as shown in FIG. 8, the back sides of the tip seals 17 and 18 are formed in a saw shape, and
Although the end of a, 18a is always in contact with the bottom of the groove 41, 42 by elasticity so as to block the passage 43, the effect of preventing leakage is not sufficient. There was a problem that the production was difficult and the cost increased.

The present invention solves the above-mentioned drawbacks of the prior art and provides a scroll type fluid machine in which gas on the high pressure side does not leak to the low pressure side through the passage even if the tip seal floats out of the groove. It is assumed that.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a spiral wrap in which a tip seal is fitted in a concave groove formed in a front end surface thereof. In a scroll-type fluid machine configured by interlocking a fixed scroll and an orbiting scroll that are erected on the inner surface of a tip seal, a circular cross section or a track-shaped cross section whose diameter is the width is formed on the back surface of the tip seal. The present invention relates to a scroll-type fluid machine characterized in that at least one projection is provided, and a recess is formed at the bottom of the groove corresponding to the projection, into which the projection is fitted.

[0014]

Since the present invention has the above-mentioned structure, it has the following effects. That is, even when the tip seal floats from the concave groove under the orbital movement of the orbiting scroll, the outer surface of the projection formed on the back surface of the chip seal is pressed against the side wall of the concave portion by the gas on the high pressure side and comes into close contact therewith. Therefore, the passage formed between the back surface of the chip seal and the bottom surface of the groove can be blocked, and the gas on the high pressure side does not leak to the low pressure side through the passage.

[0015]

1 is a two-sided view of a tip seal according to one embodiment of the present invention, (a) is a rear view, (b) is a front view,
53 is a chip seal, and 54 is a projection provided on the chip seal. FIG. 2 is a partial cross-sectional view of the spiral wrap showing the mounted state of the tip seal of the embodiment.
50 is a spiral wrap, 51 is a concave groove, and 52 is a concave portion provided on the spiral wrap. FIG. 3 is a rear view of a tip seal according to another embodiment of the present invention. The other parts are the same as in the prior art.

In this embodiment, the fixed scroll 10
Alternatively, a tip seal 53 is fitted and disposed in a concave groove 51 formed in the distal end surface of the spiral wrap 50 of the orbiting scroll 14. At least one protrusion 54 is formed on the back surface of the chip seal 53. The protrusion 54 has a circular cross section having a diameter equal to the width of the chip seal 53 or FIG.
As shown in FIG. 7, two semicircles having a diameter equal to the width of the tip seal 53 are opposed to each other, and their side edges are connected by a straight line. This projection 5
The chip seal 53 formed with 4 can be easily manufactured by an injection molding method. The chip seal 5 is provided in the concave groove 51.
A concave portion 52 into which the projection 54 is fitted is formed at a position corresponding to the third projection 54. The recess 52 is formed slightly larger so that the projection 54 can be fitted with a margin.
In addition, the concave portion 52 can be easily machined by making a deep cut with an end mill tool used for drilling the concave groove 51.

In the present apparatus, the tip seal 53 floats from the groove 51 under the orbital movement of the orbiting scroll 14, but the outer surface of the projection 54 of the tip seal 53 is formed by the gas pressure of the high-pressure side central chamber 22. The back surface of the tip seal 53 and the concave groove 5
The passage 43 formed between the first and bottom surfaces is blocked. Therefore, the high-pressure gas in the center chamber 22 does not leak through the passage 43 to the suction chamber 28 on the low-pressure side. FIG. 4 is a partial cross-sectional view of the spiral wrap showing the action of the tip seal 53 when pressure is applied. Y is a close contact portion between the tip seal and the concave portion, and a portion that blocks the passage 43.

According to the present embodiment, even when the tip seal floats from the groove, the gas on the high pressure side causes the protrusion to be in close contact with the side wall of the recess, and the passage formed between the back surface and the bottom surface of the groove is formed. Since it can be shut off, gas on the high pressure side does not leak to the low pressure side through the passage. In addition, the tip seal with projections can be easily manufactured by the injection molding method, and the recess can be easily processed simply by cutting deeply with an end mill tool that processes the groove. A compressor with improved performance can be provided.

[0019]

According to the scroll type fluid machine of the present invention, at least one projection having a circular cross section or a track-shaped cross section whose diameter is the width is provided on the back surface of the tip seal. Since the recess is formed at the bottom of the groove, the gas on the high pressure side does not leak to the low pressure side through the passage at the bottom of the groove even if the tip seal floats out of the groove. .

[Brief description of the drawings]

FIG. 1 is a two-sided view of a tip seal according to one embodiment of the present invention.
(A) is a rear view, (b) is a front view.

FIG. 2 is a partial cross-sectional view of the spiral wrap showing a mounted state of the tip seal of the embodiment.

FIG. 3 is a rear view of a tip seal according to another embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a spiral wrap showing the action of the tip seal when pressure is applied.

FIG. 5 is a vertical sectional view of a conventional scroll compressor.

FIG. 6 is a perspective view of a scroll used in the compressor.

FIG. 7 is a partial sectional view of a spiral wrap of the scroll.

FIG. 8 is a partial cross-sectional view of another example of the spiral wrap of the scroll.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fixed scroll 11 End plate 14 Orbiting scroll 43 Passage 50 Spiral wrap 51 Depression groove 52 Depression 53 Tip seal 54 Projection

Claims (1)

(57) [Claims] 1. A spiral wrap having a tip seal fitted in a concave groove formed in a front end surface thereof is provided between a fixed scroll and an orbiting scroll provided on the inner surface of each end plate. In the scroll-type fluid machine configured to be meshed, at least one projection having a circular cross section or a track-shaped cross section whose diameter is the diameter is provided on the back surface of the tip seal, and the concave groove bottom corresponding to the projection is provided. A scroll-type fluid machine characterized by forming a recess into which the projection is fitted.