JP2000130367A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the operation (floating) of a tip seal and improve the reliability and sealability by forming a void between a bottom surface of a seal groove of a wind starting part of a lap and a back surface of a tip seal opposite to the bottom surface of the seal groove. SOLUTION: A fixed scroll 3 erectly setting a spiral lap 3b on an end plate 3a is fixed in a sealed container comprising a high pressure chamber inside thereof, and a spiral lap 4b is also erected on one surface of a end plate 4a. The laps 3b, 4b are respectively provided with the seal grooves 3d, 4d on their point parts, and a tip seal 12 for fixed scroll and a tip seal 13 for revolving scroll are respectively accomodated in the seal grooves to seal the end plates opposite to one another. The bottom surfaces of the seal grooves 3d, 4d of the wind starting parts of the laps 3b, 4b are inclined, and the voids are formed between the bottom surfaces and the back surfaces of the tip seals 12, 13 for easily guiding the high pressure gas to the back surfaces of the tip 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 compressor, and more particularly, to a structure such as a seal groove at a tip end of a wrap.

[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. 6 is a partially enlarged view of the relationship between the fixed scroll 3 and the orbiting scroll 4 shown in FIG. 1. The fixed scroll 3 has a wrap 3b erected on an end plate 3a and the wrap 4b is erected on an end 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, and the fixed scroll 3 is provided in the seal grooves 3d 'and 4d'. The tip seal 12 and the tip seal 13 for the orbiting scroll 4 are accommodated, respectively, to seal between the facing end plates.

FIG. 7A is an enlarged view of the form of the seal. The high-pressure gas on the wrap high pressure side is guided to the back of the chip seals 12 and 13 to seal the gap 16 in the axial direction by the differential pressure. I have.

[0006]

However, as shown in FIG. 7B, since the seal grooves 3d 'and 4d' on the back surfaces of the chip seals 12 and 13 are flat, the chip seal 1
2 and 13 are stuck to the seal grooves 3d 'and 4d', and high-pressure gas cannot be guided to the back surface of the chip seals 12 and 13. Therefore, the chip seals 12 and 13 do not operate (float) and become broken arrows. As shown, the high-pressure gas leaks from the gap 19, which may cause a decrease in the performance of the compressor. Therefore,
SUMMARY OF THE INVENTION It is an object of the present invention to provide a scroll-type compressor capable of ensuring the operation (floating) of a tip seal, 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 type compressor having a seal groove provided with a chip seal, a gap is provided between the bottom surface of the seal groove at the winding start portion of the wrap and the back surface of the chip seal facing the bottom surface of the seal groove. .

The gap is formed by providing a slope on the bottom surface of the seal groove. Further, the gap is formed by providing a stepped recess on the bottom surface of the seal groove. In addition, the gap is formed by providing an inclination on the back surface of the tip end of the tip seal facing the bottom surface of the seal groove. Further, the gap is formed by providing a step on the back surface of the tip portion of the tip seal facing the bottom surface of the seal groove.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.
A description will be given based on FIG. FIG. 1 is a sectional view of a main part of a scroll-type 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 closed vessel 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. 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. 4 is an enlarged view of the winding start portion of the wrap, and the sealing groove 3 at the winding start portion of the wraps 3b and 4b is shown.
An inclined surface 14 is provided on the bottom surface of each of d and 4d, and a space to be described later is provided between the back surface of each of the tip seals 12 and 13 as shown in FIG. And the tip seals 12 and 13 are assisted (floating).

FIGS. 5A, 5B, 5C and 5D show the winding start portions of the wraps 3b and 4b and the tip seal 1 respectively.
In the first embodiment shown in FIG. 4A, a gap 15 is provided between the tip seals 12 and 13 by providing an inclination 14 on the bottom surfaces of the seal grooves 3d and 4d.
Is formed. In the second embodiment shown in (B), a gap 15 is formed between the chip seals 12 and 13 by providing a stepped recess 16 on the bottom surfaces of the seal grooves 3d and 4d. In the third embodiment shown in FIG. 4C, the tip seals 12 and 13 are provided with an inclination 17 on the back surface of the tip seals facing the bottom surfaces of the seal grooves 3d and 4d, so that a gap is formed between the tip seals 12 and 13. 15 is formed. In the fourth embodiment shown in FIG. 4D, a gap 18 is provided between the tip seals 12 and 13 by providing a step 18 on the back surface of the tip end of the tip seals 12 and 13 facing the bottom surfaces of the seal grooves 3d and 4d. Is formed.

With the structure described above, the high-pressure gas on the high-pressure side of the wraps 3b, 4b is led to the back of the chip seals 12, 13 through the gap 15, and the pressure difference between the low-pressure side and the tip seals 12, 13 causes 13 is reliably actuated (floating), and the end plates 3a, 4a facing the ends of the wraps 3b, 4b
The axial gap 19 between them is reliably sealed.

[0016]

As described above, in the present invention,
By forming a gap to guide high pressure gas between the bottom of the seal groove at the beginning of winding of the wrap and the back of the chip seal,
A scroll type compressor that ensures the operation of the tip seal, improves reliability, and improves sealability.

[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.

FIG. 3 is an exploded perspective view of a wrap and a tip seal according to the present invention.

FIG. 4 is an enlarged perspective view of a main part of the wrap showing the embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a main part showing an embodiment of the present invention;
(A) is an example in which a slope is provided on the bottom surface of the seal groove, (B) is an example in which a stepped recess is provided in the bottom surface of the seal groove, (C) is an example in which a slope is provided on the back surface of the chip seal, and (D) is an example. This is an example in which a step is provided on the back surface of the chip seal.

FIG. 6 is a sectional view of a main part of a scroll type compressor showing a conventional example.

FIG. 7 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.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 High-pressure chamber 3 Fixed scroll 3a End plate 3b Lapping 3d Seal groove 4 Orbiting scroll 4a End plate 4b Lapping 4c Orbiting scroll shaft 4d Seal groove 12, 13 Chip seal 14 Slope 15 Void 16 Step recess 17 Slope 18 Step 19 Gap

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 compressor in which a tip seal is provided in a seal groove provided at a tip end portion of the wrap, the bottom surface of the seal groove at the winding start portion of the wrap and the tip seal facing the bottom surface of the seal groove. A scroll compressor characterized by providing a gap between the back surfaces. 2. The scroll-type compressor according to claim 1, wherein the gap is formed by providing a slope on a bottom surface of the seal groove. 3. The scroll compressor according to claim 1, wherein the gap is formed by providing a stepped recess on the bottom surface of the seal groove. 4. The scroll-type compressor according to claim 1, wherein the gap is formed by providing an inclination on the back surface of the tip end of the tip seal facing the bottom surface of the seal groove. 5. The scroll compressor according to claim 1, wherein the gap is formed by providing a step on the back surface of the tip end of the tip seal facing the bottom surface of the seal groove.