JP2000161258A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure actuation (floating) of chip seals, to improve reliability, and to improve sealing performance by arranging a through hole between a bottom surface of seal grooves of a winding start part of laps and an inner wall surface of the laps. SOLUTION: A fixed scroll having a lap 3a erected on an end plate and a turning scroll having a lap 4b erected on an end plate are arranged by meshing the laps, and seal grooves 3a, 4a are respectively arranged in tip parts in the laps 3b, 4b, and a chip seal 12 for the fixed scroll and chip seal 13 for a turning scroll are respectively housed in the seal grooves to seal the mutual opposed end plates. The laps 3b, 4b are constituted of an involute curve, and the chip seals 12, 13 are respectively fitted in the seal grooves 3d, 4d. A through hole 14 is arranged between a bottom surface of the seal grooves 3d, 4d of a winding start part of the laps 3b, 4b and an inner wall surface of the laps 3b, 4b to easily introduce high pressure gas into a back face of the chip seals 12, 13 to be constituted so as to assist actuation (floating) of the chip seals 12, 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor, and more particularly, to a structure of a wrap for improving a sealing property by a tip seal between the wrap and a head plate.

[0002]

2. Description of the Related Art As a scroll type compressor, for example, FIG.
And those shown in FIG. In the compressor, a fixed scroll 3 in which a spiral wrap 3b is erected on a head plate 3a and a discharge hole 3c is formed substantially at the center is fixed in a sealed container 1 having a high-pressure chamber 2 inside. A spiral scroll 4b having a spiral wrap 4b provided on one surface of the end plate 4a and a rotary scroll shaft 4c provided on the other surface is eccentrically arranged by meshing the laps thereunder. A suction chamber 6 and a discharge chamber 7 are provided at the outer periphery and the center of the formed compression chamber 5, respectively. on the other hand,
A drive bearing 9 is provided at the center of a frame 8 fixed to the fixed scroll 3 at an outer peripheral portion and is supported by the bearing 9 (not shown). An eccentric bearing 11 is provided at an upper end of a crankshaft 10 driven by an electric motor, and the orbiting scroll shaft 4c is inserted into the eccentric bearing 11.

[0003] Since there is a minute gap between the wraps 3b and 4b of the two scrolls and the end plates facing each other, the compressed gas leaks and the performance is reduced. As a countermeasure, a tip seal is attached to the tip of the wrap, high-pressure gas is introduced to the back of the tip seal, and a gap in the axial direction is sealed by a differential pressure from the low-pressure side.

FIG. 2 is a partially enlarged view of the relationship between the fixed scroll 3 and the orbiting scroll 4 in FIG. 1. The fixed scroll 3 has a wrap 3b erected on a head plate 3a and the wrap 4b is erected on a mirror plate 4a. The orbiting scroll 4 is disposed with the wraps meshing with each other, and the wraps 3b and 4b are provided with seal grooves 3d and 4d respectively at the tip ends thereof.
And the tip seal 13 for the orbiting scroll 4 is accommodated, respectively, to seal the space between the tip plate 13 and the facing end plate.

FIG. 9A is an enlarged view of the form of the seal. The high-pressure gas on the high pressure side of the lap is guided to the back of the tip seals 12 and 13 to seal the gap 17 in the axial direction by the differential pressure. I have.

[0006]

However, as shown in FIG. 9 (B), since the seal grooves 3d and 4d on the rear surfaces of the chip seals 12 and 13 are flat,
3 sticks to the seal grooves 3d, 4d, so that high-pressure gas cannot be guided to the back surface of the chip seals 12, 13, the tip seals 12, 13 do not operate (float), and the gap 18 as shown by the dashed arrow. Higher pressure gas may lead to leakage compressor performance degradation. Therefore, in the present invention, the operation (floating) of the tip seal is ensured,
It is an object of the present invention to provide a scroll compressor capable of improving reliability and improving sealing performance.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a fixed scroll having a spiral wrap standing on a mirror plate is fixed in a closed container. The spiral wrap is provided upright on the surface of the fixed scroll, and the orbiting scroll provided with the orbiting scroll shaft on the other surface is eccentrically opposed to the wrap of the fixed scroll, and is provided at the tip of the wrap. In a scroll compressor in which a tip seal is provided in a seal groove, a through hole is provided between a bottom surface of the seal groove at a winding start portion of the wrap and an inner wall surface of the wrap.

In addition, the through hole is provided with a step, the diameter on the seal groove side is increased, and the diameter on the inner wall surface side of the wrap is reduced. Further, a stepped recess is provided on the bottom surface of the seal groove at the winding start portion of the lap, and the through hole is provided between the bottom surface of the stepped recess and the inner wall surface of the wrap. Further, a concave portion is provided on the back surface of the winding start portion of the tip seal facing the bottom surface of the seal groove. Further, the opening of the through-hole opening on the inner wall surface of the wrap is opened closer to the winding start side of the wrap where the pressure becomes higher than the opening on the seal groove side.

[0009]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a sectional view of a main part of a scroll compressor according to the present invention, in which a fixed scroll 3 in which a spiral wrap 3b is erected on a head plate 3a is fixed in a sealed container 1 having a high-pressure chamber 2 inside. Similarly, a spiral wrap 4b is provided upright on one surface of the end plate 4a, and a revolving scroll 4 provided with a revolving scroll shaft 4c on the other surface is eccentrically opposed to each other by engaging the wraps, and is formed between the two wraps. A suction chamber 6 and a discharge chamber 7 are provided at the outer periphery and the center of the compression chamber 5, respectively, and a suction pipe 6a is connected to the suction chamber 6, and a discharge hole 3c is formed substantially at the center of the fixed scroll 3 to form a discharge chamber. 7 communicates with the high-pressure chamber 2, and further, a discharge pipe 1 a is provided in the sealed container 1, and a flow from the suction pipe 6 a to the discharge pipe 1 a via the suction chamber 6, the compression chamber 5, the discharge chamber 7, and the high-pressure chamber 2. Form a road.

On the other hand, a drive bearing 9 is located below the orbiting scroll 4 and receives a thrust load therefrom.
An eccentric bearing 11 is provided at an upper end of a crankshaft 10 driven by an electric motor (not shown) supported by the bearing 9, and the orbiting scroll shaft 4 c is inserted into the eccentric bearing 11. An Oldham ring (not shown) is provided between the frame 8 and the end plate 4a of the orbiting scroll 4.

FIG. 2 is an enlarged view of a main part of FIG. 1. A fixed scroll 3 having a wrap 3b standing on a head plate 3a and a revolving scroll 4 having a wrap 4b standing on a head plate 4a are arranged by meshing the wraps. The wraps 3b and 4b are provided with seal grooves 3d and 4d at the tips, respectively, and accommodate the fixed scroll tip seal 12 and the orbiting scroll tip seal 13 in the seal grooves, respectively. The space between them is sealed.

FIG. 3 is an exploded perspective view of the spiral wrap and the tip seal, wherein the wraps 3b and 4b are formed by involute curves, and the tip seal 1 is inserted into the seal grooves 3d and 4d.
2 and 13 are fitted respectively.

FIG. 4A shows the first embodiment of the present invention, and FIG. 4B is a cross-sectional view of a main part of the wrap, and shows the main part of the wrap 3b, 4b. A through hole 14 is provided between the bottom surfaces of the seal grooves 3d, 4d and the inner wall surfaces of the wraps 3b, 4b to facilitate introduction of high-pressure gas to the back surfaces of the chip seals 12, 13.
It is configured to assist the operation (floating) of No. 13.

FIG. 5A is a sectional view showing a second embodiment of the present invention, and FIG. 5B is a sectional view of a main part of the wrap. A step is provided at an intermediate portion of a through hole 14 provided between the bottom surfaces of the seal grooves 3d, 4d and the inner wall surfaces of the wraps 3b, 4b. ,
The diameter of the inner wall surface side (high-pressure side) of 4b is reduced.

FIG. 6A shows a third embodiment of the present invention, in which the wrap is wound, and FIG. 6B is a cross-sectional view of a main part of the wrap. Step recesses 15 are provided on the bottom surfaces of the seal grooves 3d and 4d of
5 and the inner wall surface (high pressure side) of the wraps 3b, 4b are provided with through holes 14.

FIG. 7A is a sectional view showing the relationship between the tip seal and the wrap, and FIG. 7B is a sectional view showing the relationship between the tip seal and the wrap according to a fourth embodiment of the present invention.
b, the bottom of the seal grooves 3d, 4d at the beginning of winding of 4b;
A through hole 14 is provided between the inner surfaces (high pressure side) of the wraps 3b and 4b, and a concave portion 1 is formed on the back surface of the beginning of winding of the tip seals 12 and 13 facing the bottom surfaces of the seal grooves 3d and 4d.
6 is provided.

FIG. 8 shows the positional relationship between the discharge chamber 7 formed by the meshing of the wraps 3b and 4b and the opening 14a of the through-hole 14. The through-hole opening on the inner wall surface of the wrap 4b (3b). Since the opening 14a of the discharge chamber 7 is opened closer to the winding start side of the wrap 4b (3b) where the pressure is higher than the opening on the seal groove side, the high-pressure gas in the discharge chamber 7 is chipped through the through-hole 14. The tip seals 12 and 13 are reliably actuated (floated) by the pressure difference between the low pressure side and the tip of the wraps 3b and 4b. Can be sealed.

The above-described through holes 14 are all provided straight from the bottom surfaces of the seal grooves 3d, 4d to the inner wall surfaces (high pressure side) of the wraps 3b, 4b, but the present invention is not limited to this. For example, a hole having a desired depth is provided in the vertical direction from the bottom surface of the seal grooves 3d and 4d, while the wrap 3
A through hole having an L-shaped cross section may be provided by providing another horizontal hole from the inner wall surfaces (high pressure side) of b and 4b toward the hole.

[0019]

As described above, in the present invention,
By forming a through-hole for introducing high-pressure gas between the bottom surface of the seal groove at the start of winding of the wrap and the inner wall surface (high-pressure side) of the wrap, the operation of the tip seal is ensured, and the reliability is improved. A scroll compressor capable of improving the sealing performance is obtained.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a scroll compressor according to the present invention and a conventional example.

FIG. 2 is an enlarged sectional view of a main part of a scroll compressor according to the present invention and a conventional example.

FIG. 3 is an exploded perspective view of a wrap and a tip seal of the scroll compressor.

FIG. 4 is an enlarged perspective view (A) and a cross-sectional view (B) of a main part of the wrap showing the first embodiment of the present invention.

FIG. 5 is an enlarged perspective view (A) and a cross-sectional view (B) of a main part of a wrap showing a second embodiment of the present invention.

FIG. 6 is an enlarged perspective view (A) and a sectional view (B) of a main part of a wrap according to a third embodiment of the present invention.

FIG. 7 is an enlarged perspective view of a main part of a tip seal according to a fourth embodiment of the present invention (A) and a cross-sectional view (B) showing a relationship between the tip seal and a wrap.

FIG. 8 is an enlarged perspective view of a main part showing a positional relationship between a discharge chamber and an opening of a through hole in the present invention.

FIG. 9 is an enlarged sectional view of a main part showing a conventional example, in which (A) shows a state in which the tip seal is operated, and (B) shows a state in which the tip seal is not operated.

DESCRIPTION OF SYMBOLS 1 Closed container 2 High pressure chamber 3 Fixed scroll 3a End plate 3b Wrap 3d Seal groove 4 Orbiting scroll 4a End plate 4b Wrap 4c Orbiting scroll shaft 4d Seal groove 12, 13 Tip seal 14 Through hole 15 Step recess 16 Recess

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[Procedure amendment]

[Submission date] December 18, 1998 (1998.12.
18)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

FIG. 5

Claims (5)

[Claims] 1. A fixed scroll in which a spiral wrap is erected on a head plate is fixed in an airtight container, and a spiral wrap is erected on one surface of the head plate and a revolving scroll shaft is provided on the other surface. The orbiting scroll provided is eccentrically opposed to the wrap of the fixed scroll by meshing the wrap with the wrap of the fixed scroll,
And in a scroll type compressor provided with a tip seal in a seal groove provided at the tip of the wrap, a through hole is provided between the bottom surface of the seal groove at the winding start portion of the wrap and the inner wall surface of the wrap. A scroll compressor characterized by comprising: 2. The scroll compressor according to claim 1, wherein a step is formed in the through-hole, the diameter on the seal groove side is increased, and the diameter on the inner wall surface side of the wrap is reduced. 3. The scroll according to claim 1, wherein a stepped recess is provided in a bottom surface of the seal groove at a winding start portion of the wrap, and the through hole is provided between a bottom surface of the stepped recess and an inner wall surface of the wrap. Type compressor. 4. The scroll compressor according to claim 1, wherein a concave portion is provided on a back surface of a winding start portion of the tip seal facing a bottom surface of the seal groove. 5. The scroll according to claim 1, wherein the opening of the through-hole opening in the inner wall surface of the wrap is opened closer to the winding start side of the wrap where the pressure is higher than the opening on the seal groove side. Type compressor.