JP2000170673A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the operation (floating) of a tip seal and to improve reliability and sealing ability by forming an extension groove communicated with a sealing groove and longer than a tip seal at the seal groove tip of the first part of lapping. SOLUTION: In a scroll compressor comprising a fixed scroll comprising a spiral lap 3b erected on a panel board fixed in a closed container, a spiral lap 4b erected on one face of the panel board, a rotary scroll comprising a rotary scroll shaft provided on the other face of the panel board opposed to the laps 3b and 4b meshed and made eccentric with each other, tip seals 13 provided in the seal grooves 4d provided at the tip sections of both laps 3b and 4b, and a discharge port 3c provided in the center part of the fixed scroll, an extension groove, which is communicated with the seal groove 4d and is longer than the tip seals 13, is formed at the tip of the seal groove 4d of the first part of lapping of the lap section 4b.

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 of a seal and a seal groove provided at a leading end of a scroll wrap for guiding high-pressure gas.

[0002]

2. Description of the Related Art As a conventional scroll compressor, there is, for example, one shown in FIGS. In the figure, a fixed scroll 3 in which a spiral wrap 3b is erected on a head plate 3a and a discharge port 3c is formed substantially at the center in a closed container 1 having a high-pressure chamber 2 inside.
The orbiting scroll 4 provided with a spiral wrap 4b on one surface of the end plate 4a and an orbiting scroll shaft 4c on the other surface is eccentrically arranged by meshing the wraps. A suction chamber 6 and a discharge chamber 7 are provided at the outer periphery and the center of the compression chamber 5 formed between the wraps, respectively. On the other hand, it is located below the orbiting scroll 4 and receives its thrust load, and the fixed scroll 3
A drive bearing 9 is provided at a central portion of a frame 8 fixed to the eccentric shaft, and 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. The orbiting scroll shaft 4c is mounted on the bearing 11
Is inserted.

Since there is a minute gap between the scroll wraps 3b and 4b 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 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 tip ends thereof, and the fixed seal tip seal 12 and the orbiting scroll tip seal 13 are accommodated in the seal grooves, respectively. The space between them is sealed.

FIG. 7 shows the tip seals 12 and 13 and the seal grooves 3d and 4d at the tips of the scroll wraps 3b and 4b.
In the perspective view showing the relationship, the width of the tip seals 12 and 13 has a small gap with the seal grooves 3d and 4d to prevent gas leakage. In the above-described configuration, as shown in FIG.
The gap 16 in the axial direction is sealed by the differential pressure which is guided to the back surfaces of the second and the 13th. However, as shown in FIG.
Since the seal grooves 3d and 4d on the back surface of the chip seals 12 and 13 are flat, the chip seals 12 and 13 are
d, the high-pressure gas cannot be guided to the rear surfaces of the tip seals 12, 13, the tip seals 12, 13 do not operate (float), and the high-pressure gas leaks from the gap 16 as shown by the dashed arrow. There is a risk that performance will be degraded.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an extended groove longer than the tip seal formed at the leading end of the seal groove at the wrap winding start portion. Ensuring the seal operates (floating),
It is an object of the present invention to provide a scroll compressor capable of improving reliability and 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. A spiral scroll provided with a spiral scroll shaft provided on the other surface is eccentrically opposed to the orbiting scroll provided with a orbiting scroll shaft on the other surface, and a tip seal is provided in a seal groove provided at the tip portions of the both wraps. In the scroll compressor provided with a discharge port at the center of the fixed scroll, an extended groove longer than the tip seal is formed at the tip of the seal groove at the beginning of winding of the wrap, at the tip of the seal groove. A scroll compressor, comprising:

Further, the extension groove intersects the discharge port.

[0009] Further, the extension groove is formed deeper than the seal groove.

[0010] Further, the extension groove is configured to be narrower in width than the seal groove.

Further, the tip seal is arranged so as not to intersect with the discharge port.

Further, a pressure introducing hole intersecting with the extension groove of the fixed scroll is provided on the bottom surface of the orbiting scroll wrap.

Further, the pressure introducing hole is formed in a circular shape smaller than the diameter of the discharge port.

Further, the pressure introducing hole is arranged so as not to intersect with the tip seal.

Further, a fixed scroll in which a spiral wrap is erected on a head plate is fixed in a closed 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. A scroll compressor having the orbiting scrolls eccentrically opposed to each other by meshing the wraps, providing a tip seal in a seal groove provided at a tip portion of each of the wraps, and having a discharge port at a central portion of the fixed scroll. , The scroll wrap is formed of an involute curve, and the inside of the winding start portion of the tip seal is formed inside the involute curve.

Further, a fixed scroll in which a spiral wrap is erected on a head plate is fixed in a closed container. Similarly, a spiral wrap is erected on one surface of the head plate and a rotary scroll shaft is provided on the other surface. A scroll compressor having the orbiting scrolls eccentrically opposed to each other by meshing the wraps, providing a tip seal in a seal groove provided at a tip portion of each of the wraps, and having a discharge port at a central portion of the fixed scroll. , The scroll wrap is formed of an involute curve, and the inside of the winding start portion of the seal groove is formed outside the involute curve.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a scroll compressor according to the present invention will be described below with reference to FIGS. 1, 2, 3 and 4. FIG. FIG. 1 is a partial cross-sectional view of the apparatus, in which a spiral wrap 3
(b) is fixed, and a spiral wrap (4b) is similarly erected on one surface of the end plate (4a), and the orbiting scroll (4) provided with a orbiting scroll shaft (4c) on the other surface is engaged with the wrap. The suction chamber 6 and the discharge chamber 7 are respectively provided at the outer periphery and the center of the compression chamber 5 formed between the two wraps.
a, and a discharge port 3 c is provided substantially at the center of the fixed scroll 3.
The discharge chamber 7 is communicated with the high-pressure chamber 2 by providing a discharge pipe 1a in the closed vessel 1. The suction pipe 6a is passed through the suction chamber 6, the compression chamber 5, the discharge chamber 7, and the high-pressure chamber 2. A flow path reaching the discharge pipe 1a is formed.

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 tips, respectively.
The tip seal 12 for the fixed scroll and the tip seal 13 for the orbiting scroll are accommodated in the space d, respectively, to seal the space between the facing end plates.

FIG. 3 is an exploded perspective view of the spiral wrap and the tip seal. 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.

4A and 4B show a first embodiment of the present invention. FIG. 4A is an enlarged view of a main portion of a wrap winding start portion, and FIG. 4B is a sectional view thereof. In the figure, the orbiting scroll wrap 4b
At the leading end of the seal groove 4d at the winding start portion, an extension groove 14 which is communicated with the seal groove 4d and is longer than the tip seal 13 is formed. The depth of the extension groove 14 is formed deeper than the seal groove 4d. This facilitates the introduction of pressure to the back of the tip seal 13.

Further, the width of the extension groove 14 is made narrower than that of the seal groove 4d, thereby suppressing gas leakage at this portion. Further, the extension groove 14 is disposed so as to intersect the discharge port 3c, and furthermore, it is easy to introduce pressure to the back surface of the chip seal 13. The tip seal 13 does not cross the outlet 3c. If they intersect, the tip seal 13 may be caught by the discharge port 3c and may be damaged.

In the above construction, the high pressure gas on the high pressure side of the lap is guided to the back surface of the tip seal 13 from the extension groove 14, and the tip seal 13 is reliably actuated (floated) by the pressure difference from the low pressure side to improve reliability. And a scroll compressor capable of improving the sealing performance.

FIG. 5 shows a second embodiment of the present invention. The tip end of the seal groove 3d at the winding start portion of the fixed scroll wrap 3b is communicated with the seal groove 3d to form the tip seal 12a. The configuration is such that a longer extension groove 14 is formed. Further, a pressure introducing hole 14a intersecting with the extension groove 14 of the fixed scroll wrap 3b is provided on the bottom surface of the orbiting scroll wrap 4b.
In addition, the diameter of the pressure introducing hole 14a is formed in a circular shape smaller than the diameter of the discharge port 3c, so that the effect of the fixed scroll wrap 3b in the sealability is increased. In the above configuration, the high-pressure gas on the wrap high-pressure side is guided from the pressure introduction hole 14a to the back surface of the tip seal 12 via the extension groove 14,
Similarly to the first embodiment, a scroll compressor that can reliably operate (float) the tip seal 12 by the differential pressure from the low pressure side to improve reliability and seal performance. Become.

FIGS. 6 (A) and 6 (B) show a third embodiment of the present invention. In FIG. 6 (A), the scroll wraps 3b and 4b are formed by involute curves and The gaps 12a and 13a are formed so that the inside of the winding start portion of the seals 12 and 13 is inside the involute curve. Also,
In FIG. 6B, gaps 3e and 4e are formed such that the inside of the winding start portion of the seal grooves 3d and 4d is outside the involute curve. In the above configuration, the high-pressure gas on the high-pressure side of the lap is
a, 13a or 3e, 4e from the tip seal 1
2 and 13, the tip seal 12 and the tip seal 12, due to the pressure difference from the low pressure side, as in the first and second embodiments.
Thus, the scroll compressor can reliably operate (float), improve the reliability, and improve the sealing performance.

[0026]

As described above, according to the present invention, an extension groove and a pressure introduction hole for introducing high-pressure gas are formed at the end of the seal groove at the beginning of the wrap winding, thereby ensuring the operation (floating) of the tip seal and ensuring reliability. The scroll compressor can improve the sealing performance and improve the sealing performance.

[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 according to the present invention.

4 (A) is an enlarged view of a main part of a wrap winding start portion, and FIG. 4 (B) is a sectional view of the first embodiment according to the present invention.

5 (A) is an enlarged view of a main part of a wrap winding start portion, and FIG. 5 (B) is a sectional view of the second embodiment according to the present invention.

FIG. 6 shows a third embodiment according to the present invention, wherein (A) shows the tip seal tip inside the involute curve,
(B) shows the tip of the seal groove outside the involute curve.

FIG. 7 is a perspective view of a main part of a tip seal and a tip of a seal groove according to a conventional example.

8A and 8B are enlarged sectional views of a main part according to a conventional example, in which FIG. 8A shows a state in which a tip seal is activated, and FIG. 8B shows a state in which the tip seal is not activated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 High-pressure chamber 3 Fixed scroll 3a End plate 3b Lap 3d Seal groove 3e, 4e gap 4 Orbiting scroll 4a End plate 4b Lap 4c Orbiting scroll shaft 4d Seal groove 12, 13 Tip seal 14 Extension groove 14a Pressure introduction hole

Claims (10)

[Claims] 1. A fixed scroll in which a spiral wrap is erected on a head plate is fixed in a closed 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. A scroll compressor having the orbiting scrolls eccentrically opposed to each other by meshing the wraps, providing a tip seal in a seal groove provided at a tip portion of each of the wraps, and having a discharge port at a central portion of the fixed scroll. 3. The scroll compressor according to claim 1, wherein an extension groove communicating with the seal groove and being longer than the tip seal is formed at a tip end of the seal groove at a winding start portion of the wrap. 2. The scroll compressor according to claim 1, wherein the extension groove intersects the discharge port. 3. The scroll compressor according to claim 1, wherein said extension groove is formed deeper than said seal groove. 4. The scroll compressor according to claim 1, wherein the width of the extension groove is smaller than that of the seal groove. 5. The scroll compressor according to claim 1, wherein the tip seal is arranged so as not to intersect with the discharge port. 6. The scroll compressor according to claim 1, wherein a pressure introducing hole intersecting with an extension groove of the fixed scroll is provided on a bottom surface of the orbiting scroll wrap. 7. The scroll compressor according to claim 1, wherein the pressure introduction hole is formed in a circular shape smaller than a diameter of the discharge port. 8. The device according to claim 1, wherein the pressure introducing hole is arranged so as not to intersect with the tip seal.
Or the scroll compressor according to 7. 9. 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 compressor having the orbiting scrolls eccentrically opposed to each other by meshing the wraps, providing a tip seal in a seal groove provided at a tip portion of each of the wraps, and having a discharge port at a central portion of the fixed scroll. 5. The scroll compressor according to claim 1, wherein the scroll wrap is formed of an involute curve, and the inside of the winding start portion of the tip seal is formed inside the involute curve. 10. 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. A scroll compressor having the orbiting scrolls eccentrically opposed to each other by meshing the wraps, providing a tip seal in a seal groove provided at a tip portion of each of the wraps, and having a discharge port at a central portion of the fixed scroll. 5. The scroll compressor according to claim 1, wherein the scroll wrap is formed of an involute curve, and the inside of the winding start portion of the seal groove is formed outside the involute curve.