JPH11230064A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a leakage of gas without requiring to narrow the width of a tip seal even when a fixed scroll and the spiral lap of a rotary scroll are made thin in thickness by forming the sidewall of a seal groove on the outside only. SOLUTION: A seal groove 42 for burying a tip seal 18 is bored on the tip face 41 of the spiral lap 16 of a rotary scroll 14. The seal groove 42 has a sidewall 43 only on the outside, i.e., on the radial direction side of the spiral, and a sidewall on the inside is eliminated. The pressure in a compression chamber on the center side of the spiral is made higher than the pressure in the compression chamber on the outside during the operation of a scroll compressor, and the tip seal 18 is pressed to the outside in the seal groove 42, i.e., in the radial direction, into close contact with the sidewall 43 to prevent the high- pressure gas in the compression chamber on the center side from leaking into the outside compression chamber. Even when a fixed scroll and the spiral lap 16 of the rotary scroll 14 are made thin in thickness, the width of the tip seal 18 is not required to be narrowed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a scroll compressor.

[0002]

2. Description of the Related Art An example of a conventional scroll compressor is shown in FIG. Reference numeral 1 denotes a housing, which comprises a cup-shaped main body 2 and a front housing 6 fastened to the main body by bolts (not shown). The rotating shaft 7 penetrating the front housing 6 is rotatably supported by the front housing 6 via bearings 8 and 9.

A fixed scroll 10 is provided inside a housing 1.
And an orbiting scroll 14 are provided. The fixed scroll 10 includes an end plate 11 and a spiral wrap 12 erected on the inner surface of the end plate 11, and the end plate 11 is fastened to the cup-shaped main body 2 by bolts 13. The housing 1 is partitioned by bringing the outer peripheral surface of the end plate 11 into close contact with the inner peripheral surface of the cup-shaped main body 2, the discharge cavity 31 is limited outside the end plate 11, and the suction chamber 28 is formed inside the end plate 11. Limited.

A discharge port 29 is formed in the center of the end plate 11, and the discharge port 29 is opened and closed by a discharge valve 30. The lift of the discharge valve 30 is regulated by a valve retainer 32, and one end of each of the discharge valve 30 and the valve retainer 32 is
11 has been concluded.

The orbiting scroll 14 has an end plate 15 and a spiral wrap 16 erected on its inner surface. A drive bush 21 is rotatably fitted to the inside of a cylindrical boss 20 protruding from the center of the outer surface of the end plate 15 via a swivel bearing 23, and a slide groove 24 formed in the drive bush 21.
An eccentric drive pin 25 projecting eccentrically from the inner end of the rotary shaft 7 is slidably fitted therein.

The orbiting scroll 14 and the fixed scroll 10 are eccentric with each other by a predetermined distance, and are engaged with each other at an angle of 180 ° as shown in the figure. Thus, the tip seal 17 buried at the distal end surface of the spiral wrap 12 is in close contact with the inner surface of the end plate 15, and the chip seal 18 buried at the distal end surface of the spiral wrap 16 is in close contact with the inner surface of the end plate 11. The side surfaces of the spiral wraps 12 and 16 are in line contact with each other at a plurality of locations and are substantially point-symmetric with respect to the center of the spiral.
Is formed.

[0007] An Oldham link 26 is interposed between the outer peripheral edge of the outer surface of the end plate 15 and the inner end surface of the front housing 6.
A thrust bearing 36 fixed to the inner end surface of the front housing 6 is in sliding contact with the outer peripheral edge of the outer surface of the end plate 15.

The drive bush 21 is used to balance the dynamic imbalance caused by the orbiting movement of the orbiting scroll 14.
, A balance weight 27 is fixed, and a balance weight 37 is fixed to the rotating shaft 7.

When the rotary shaft 7 is rotated, the orbiting scroll 14 is driven via the eccentric drive pin 25, the slide groove 24, the drive bush 21, the orbit bearing 23, and the boss 20.
The orbiting scroll 14 revolves orbiting while its rotation is prevented by the Oldham link 26.

Then, the line contact portions on the side surfaces of the spiral wraps 12 and 16 gradually move toward the center of the spiral, and as a result,
The compression chambers 19a and 19b move toward the center of the spiral while reducing their volumes.

Accordingly, gas flowing into the suction chamber 28 through a suction port (not shown) is taken into the compression chambers 19a and 19b from the openings limited by the outer ends of the spiral wraps 12 and 16. While gradually being compressed, it reaches the central chamber 22, from which it is discharged to the discharge cavity 31 by pushing and opening the discharge valve 30 through the discharge port 29, and then discharged to the outside via a discharge port (not shown).

[0012]

In the above-mentioned conventional scroll compressor, the tip seal 1 is provided on the tip end surfaces of the spiral wraps 12, 16 of the fixed scroll 10 and the orbiting scroll 14.
7 and 18 are buried, but when the thickness of the spiral wraps 12 and 16 is reduced, the width of the chip seals 17 and 18 and the seal groove in which these are fitted becomes narrower. However, there is a problem that the performance is deteriorated due to leakage.

Further, since the end mill for processing the seal groove must have a small diameter, there is a problem that the processing becomes difficult and the end mill is easily broken.

[0014]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its gist is that it is provided on a tip surface of a spiral wrap of a fixed scroll and an orbiting scroll. In a scroll compressor having a chip seal embedded in a sealed groove formed therein, a side wall of the seal groove is formed only on an outer side.

[0015]

FIG. 1 shows an embodiment of the present invention. FIG. 1 (A) is an exploded perspective view of an orbiting scroll, and FIG. 1 (B) is a partial cross-sectional view showing a state in which a tip seal is embedded.

The tip surface 41 of the spiral wrap 16 of the orbiting scroll 14 has a seal groove 42 for embedding the tip seal 18 therein.
Are drilled. The seal groove 42 has a side wall 43 only on the outer side, that is, only on the radial side of the spiral, and the inner side wall is omitted.

Although not shown, the fixed scroll 1 is similar to the above. The other configuration is the same as that of the conventional one shown in FIG. 2, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

During operation of the scroll compressor, the pressure in the compression chamber 44 on the center side of the spiral is increased by the pressure in the outer compression chamber 45.
Due to this pressure difference, the tip seal 18 is pressed outward in the seal groove 42, that is, is pressed radially and comes into close contact with the side wall 43, so that the high-pressure gas in the compression chamber 44 on the center side is discharged outside. From leaking into the compression chamber 45.

Thus, even if the spiral wraps 12 and 16 of the fixed scroll 1 and the orbiting scroll 2 become thin, it is not necessary to make the width of the tip seals 17 and 18 narrow, so that gas leakage can be prevented. Further, since it is not necessary to process the seal groove 42 with a small-diameter end mill, the processing of the seal groove 42 becomes easy, and breakage of the cutting tool is also eliminated.

[0020]

In the present invention, since the side wall of the seal groove is formed only on the outside, it is not necessary to reduce the width of the tip seal even if the thickness of the spiral wrap of the fixed scroll and the orbiting scroll is reduced. Gas leakage can be prevented.

In addition, since it is not necessary to process the seal groove with a small-diameter end mill, the processing of the seal groove is facilitated, and breakage of the cutting tool is eliminated.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, in which (A) is an exploded perspective view of an orbiting scroll, and (B) is a partial cross-sectional view showing a state in which a tip seal is embedded.

FIG. 2 is a longitudinal sectional view of a conventional scroll compressor.

[Explanation of symbols]

 14 Orbiting scroll 16 Spiral wrap 18 Tip seal 41 Tip surface 42 Seal groove 43 Side wall 44, 45 Compression chamber

Claims (1)

[Claims] 1. A scroll compressor in which a tip seal is buried in a seal groove formed in a tip end surface of a spiral wrap of a fixed scroll and an orbiting scroll, wherein a side wall of the seal groove is only outside. A scroll compressor characterized by the above-mentioned.