JP2000329081A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealing performance by making the operation (floating) of a seal member secure, so as to improve reliability. SOLUTION: A scroll type compressor is composed by fixing a fixed scroll in which a scroll form lap is erected on an end plate 3a, and a scroll form lap 4b is erected on one side surface of the end plate 3a in the same way, while a rotary scroll with a rotary scroll shaft is opposed eccentrically by engaging to the lap of the fixed scroll, on the other side surface, and furthermore, by providing a seal member 13 to a seal groove 4d provided at the front the of the lap 4b, in a sealed container. In such a scroll type compressor, the seal member 13 is composed of a main seal part 13a with the rectangular cross section at the end plate side, and a leg part 13b projecting to the bottom face of the seal groove 4d at the rear surface of the main seal part 13b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a structure for improving the sealing property of a seal member between a 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 in the center is fixed in a closed vessel 1 having a high-pressure chamber 2 inside. A swirling scroll 4 having a spiral wrap 4b erected on one surface of the end plate 4a and an orbiting 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 seal member is attached to the tip of the wrap, high-pressure gas is guided to the back surface of the seal member, 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 seal grooves 3d and 4d are provided at the tips of the wraps 3b and 4b, respectively. The seal member 12 for the fixed scroll 3 is provided in the seal grooves 3d and 4d. The seal member 13 for the orbiting scroll 4 is accommodated, respectively, to seal between the end plate and the facing end plate.

In the above configuration, it is a point that the pressure difference between the high-pressure gas on the back surface of the seal member and the periphery of the seal member is reliably generated, whereby the seal member is pressed in the direction of the end plate to prevent leakage of the refrigerant gas. In order to reliably generate this pressure difference, the radial gap between the seal member and the seal groove needs to be sealed. However, as shown in FIG. 8, when a gap is formed between the side surface of the seal member and the seal groove, gas leaks from the gap in the direction of the arrow, and the seal member does not operate (float) or is difficult to operate. This may cause the high-pressure gas in the compression chamber to leak, leading to a decrease in the performance of the compressor.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is possible to ensure the operation (floating) of a seal member, improve reliability, and improve sealability. It aims at providing a scroll type compressor.

[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. A spiral scroll provided with a spiral scroll shaft on the other surface, and a rotating scroll shaft provided on the other surface is eccentrically opposed to the fixed scroll by engaging the wrap with the wrap of the fixed scroll, and provided at the tip of the wrap. In a scroll type compressor in which a sealing member is provided in a provided sealing groove, the sealing member has a main sealing portion having a rectangular cross section on the end plate side, and a leg projecting toward the bottom surface of the sealing groove on the back surface of the main sealing portion. And a part.

Further, the leg portion is formed by a leg having a bifurcated cross section.

Further, each leg of the leg portion is formed in a triangular shape.

A heat-resistant and sliding-resistant material such as polysenilensulfur (PPS) is used for the main seal portion, and a thermal expansion coefficient such as polytetrafluoroethylene (PTFE) is used for the legs. It is configured to use an elastic material having a large diameter.

Further, the main seal portion and the leg portion are integrally joined by welding or a chemical resistant adhesive.

Further, a gap for introducing high-pressure gas is provided between the winding start end of the sealing member and the winding start end of the seal groove.

The bifurcated leg portion is formed in a circular arc shape between both legs.

The bifurcated leg has a trapezoidal shape or an inverted trapezoidal shape between the two legs.

The trapezoidal or inverted trapezoidal legs have notches provided at the outer ends of both legs.

Further, the leg of the leg portion is constituted by only one side.

[0017]

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 meshing the laps, 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 the 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 upright on a head plate 3a and a revolving scroll 4 having a wrap 4b standing upright 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 tip portions, respectively, in which the fixed scroll seal member 12 and the orbiting scroll seal member 13 are accommodated, respectively. The space between them is sealed.

FIG. 3 is an exploded perspective view of the spiral wrap and the seal member. The wraps 3b and 4b are formed by involute curves, and the seal members 12 and 13 are fitted into the seal grooves 3d and 4d, respectively. ing.

FIG. 4 shows a first embodiment of the present invention. FIG. 4A shows a cross section of a seal member, and FIG. 4B shows a relationship between a seal groove and a seal member. . Less than,
The orbiting scroll seal member 13 will be described.
The sealing member 13 is a main sealing portion having a rectangular cross section on the end plate side.
13a, and a leg portion 13b having a bifurcated cross section projecting toward the bottom surface of the seal groove 4d on the back surface of the main seal portion 13a.

The legs 13b1 and 13b2 of the bifurcated leg 13b are formed in a triangular shape, and the main seal 13
A heat-resistant and sliding-resistant material such as PPS is used for a, and an elastic material having a large coefficient of thermal expansion such as polytetrafluoroethylene (PTFE) is used for the legs 13b. The legs 13b and the legs 13b are integrally connected by welding or a chemical resistant adhesive.

A gap A (FIG. 3) for introducing high-pressure gas is provided between the winding start end of the seal member 13 and the winding start end of the seal groove 4d.

In the above configuration, when the compression operation is started and compression heat is generated in each compression chamber, the leg 13b of the seal member 13 is thermally expanded by the compression heat, and at the same time, the high-pressure gas is sealed with the back surface of the seal member 13. It is introduced into the gap B between the grooves 4d, and the high-pressure gas pushes and spreads the legs 13b1 and 13b2.
A radial gap between the seal member 13 and the seal groove 4d is sealed. When the radial gap is sealed, the sealing member 1
3 can be reliably actuated (floating) by the high-pressure gas, and the gap between the fixed scroll end plate 3a and the seal member 13 of the orbiting scroll 4 can be reliably sealed.

FIG. 5 shows another embodiment of the present invention. When the differential pressure between the high-pressure gas in the gap B and the surrounding gas pressure of the seal member 13A is small, as shown in FIG. Each of the legs 13b1 and 13b2 is previously formed so as to be spread outward, and as shown in FIG. 5B, even when the sealing member 13A is pressed against, for example, one side of the sealing groove 4d, the radial gap is sealed. The lengths of the legs 13b1 and 13b2 are ensured so that they can be made.

FIG. 6 shows another embodiment between the two legs of the seal member according to the present invention. FIG. 6 (A) shows an arc-shaped portion 13B1 formed between the two legs, and FIG. Shape 13C1
(C) is formed in an inverted trapezoidal shape 13D1, and in any case, the gap in the radial direction can be reliably sealed in the same manner as in the above embodiment. The trapezoidal shape and the inverted trapezoidal shape may be cut out at the outer ends of the legs to seal the wall of the seal groove 4d with a surface.

FIG. 7 shows still another embodiment of the present invention, in which the pressure difference between the inner wall surface (high pressure side) and the outer wall surface (low pressure side) of the wrap 4b is applied to one side (low pressure side) of the sealing member 13E. When approaching, the leg 13E1 may be configured as only one side to seal a radial gap.

[0028]

As described above, in the present invention,
When the compression operation is started and compression heat is generated in each compression chamber,
At the same time as the legs of the seal member thermally expand due to this heat of compression,
High-pressure gas is introduced into the gap between the back surface of the seal member and the seal groove, and the high-pressure gas pushes and spreads the legs, thereby sealing the radial gap between the seal member and the seal groove. When the radial gap is sealed, the seal member is reliably actuated (floats) by the high-pressure gas, and the gap between the fixed scroll head and the orbiting scroll seal member can be reliably sealed. A scroll type compressor that can be used.

[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 seal member of the scroll compressor.

FIG. 4 is an enlarged sectional view (A) and an assembled sectional view (B) of a main part of a seal member showing an embodiment of the present invention.

FIG. 5 is an enlarged sectional view (A) and an assembled sectional view (B) of a main part of a seal member showing another embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part showing another embodiment of the seal member of the present invention, wherein (A) is formed in an arc shape between both legs, (B) is trapezoidal, and (C) is It is an inverted trapezoidal shape.

FIG. 7 is an enlarged sectional view of a main part showing still another embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a main part showing a conventional example.

[Explanation of symbols]

 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 Seal member 13a Main seal 13b Leg 13b1, 13b2 Leg

Claims (10)

[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 also erected on one surface of the head plate, and a revolving scroll shaft is provided on the other surface. A scroll type compressor having a wrap meshed with a wrap of the fixed scroll, eccentrically opposed to the wrap, and a seal member provided in a seal groove provided at a tip end of the wrap. The member is a main seal portion having a rectangular cross section on the end plate side,
A scroll compressor comprising: a back surface of the main seal portion; and a leg portion protruding toward a bottom surface of the seal groove. 2. The scroll compressor according to claim 1, wherein said leg is formed by a leg having a bifurcated cross section. 3. The scroll type compressor according to claim 1, wherein each of said forked legs is formed in a triangular shape. 4. A heat-resistant and sliding-resistant material such as polysenilensulfur (PPS) is used for the main seal portion, and polytetrafluoroethylene (P) is used for the legs.
2. The scroll compressor according to claim 1, wherein an elastic material having a high coefficient of thermal expansion such as TFE) is used. 5. The scroll compressor according to claim 1, wherein said main seal portion and said leg portion are integrally joined by welding or a chemical resistant adhesive. 6. The scroll-type compressor according to claim 1, wherein a gap for introducing high-pressure gas is provided between a winding start end of the seal member and a winding start end of the seal groove. 7. The scroll-type compressor according to claim 1, wherein a space between both legs of said bifurcated leg is formed in an arc shape. 8. The trapezoidal or inverted trapezoidal shape formed between the two legs of the bifurcated leg.
The scroll-type compressor as described. 9. The scroll-type compressor according to claim 8, wherein notches are provided at outer ends of both legs of the trapezoidal or inverted trapezoidal leg. 10. The scroll-type compressor according to claim 1, wherein the leg has only one leg.