JP2010024911A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor capable of improving compression performance by constantly contacting a chip seal to an orbiting scroll and an end plate of a fixed scroll of a counterpart side, and preventing leaking of compressed air from between the chip seal and the end plate. <P>SOLUTION: In the scroll compressor disposed with the chip seal 21, the chip seal 21 is composed of two seal members 22, 23 with large and small widths, the large and small seal members 22, 23 are overlapped such that the small seal member 23 is positioned in a bottom face side of chip seal grooves 2d, 3d with respect to the large seal member 22 in the chip seal grooves 2d, 3d, and a space S is formed for flowing in the compressed air A between the large seal member 22 and bottom faces of the chip seal grooves 2d, 3d. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a scroll compressor having a fixed scroll having a spiral wrap and a turning scroll, and more particularly to a scroll compressor having improved sealing performance of a tip seal provided at the tip of the wrap.

Examples of conventional scroll compressors include those shown in FIGS. 4 to 6 (see Patent Document 1). The scroll compressor includes a fixed scroll 2 and a revolving scroll 3 that are disposed in a sealed container 1. The end plates 2a and 3a of the fixed scroll 2 and the orbiting scroll 3 are respectively provided with spiral wraps 2b and 3b, and the wraps are engaged with each other between the wraps 2b and 3b. Thus, the compression chamber 4 is formed. A suction chamber 5 and a discharge chamber 6 are formed on the outer peripheral side and the central portion of the compression chamber 4, respectively.
On the other hand, a high pressure chamber 7 is provided in the sealed container 1 located above the fixed scroll 2, and the high pressure chamber 7 communicates with the discharge chamber 6 through a discharge hole 2 c formed in the fixed scroll 2. The discharge pipe 1a provided on the side wall of the hermetic container 1 communicates with the discharge pipe 1a. The suction chamber 5 communicates with a suction pipe 1 b provided on the side wall of the sealed container 1.

  A frame 8 is provided in the sealed container 1 located below the orbiting scroll 3, and a drive bearing 9 is provided at the center of the frame 8. A crankshaft 10 that is driven by a non-driven motor is supported. An eccentric bearing 11 is provided at the upper end of the crankshaft 10, and a rotating shaft 3 c for rotating the orbiting scroll 3 is inserted into the eccentric bearing 11.

In addition, a minute gap is always generated between the tips of the wraps 2b and 3b of the fixed scroll 2 and the orbiting scroll 3 and the end plates 2a and 3a opposed to the wraps 2b and 3b. There was a risk of lowering. Conventionally, as shown in FIG. 5 and FIG. 6, tip seal grooves 2d and 3d are provided on the front end surfaces of the wraps 2b and 3b, respectively. The tip seals 12 and 13 that are brought into sliding contact with the end plates 3a and 2a of the orbiting scroll 3 and the fixed scroll 2 are accommodated, and the tip seals 12 and 13 close the gap between the end plates 2a and 3a. It comes to seal.
For this reason, the tip seals 12 and 13 need to be in contact with the end plates 3a and 2a of the opposing orbiting scroll 3 and fixed scroll 2, so that the tip seals 12 and 13 themselves have elasticity, or An elastic body is laid under the chip seals 12 and 13 (see Patent Document 2), and the chip seals 12 and 13 are configured to be biased toward the end plates 3a and 2a. .

JP 2000-161258 A JP-A-6-207588

  However, in the conventional scroll compressor, the tip portions of the tip seals 12 and 13 are pressed against the surfaces of the end plates 3a and 2a by an urging force of an elastic body or the like and are always in contact with each other. The tip portions of the tip seals 12 and 13 are worn or deformed over time by the pivoting drive. As a result, the tip seals 12 and 13 cannot come into contact with the end plates 3a and 2a of the opposing orbiting scroll 3 and fixed scroll 2, and a gap is generated between the end plates 2a and 3a. The high pressure (high stage) side compressed air leaks into the low pressure (low stage) compression space, leading to a reduction in compression performance.

  The present invention has been made in view of such a situation, and an object of the present invention is to always bring the tip seal into contact with the end plate of the other orbiting scroll and the fixed scroll, and between the tip seal and the end plate. An object of the present invention is to provide a scroll compressor capable of preventing compressed air from leaking and improving compression performance.

  In order to solve the above-described problems of the prior art, the present invention includes a fixed scroll and a orbiting scroll that form a compression space by meshing spiral wraps with each other, and at least one of the fixed scroll and the orbiting scroll. In a scroll type compressor in which a tip seal groove is provided in the tip end face and a tip seal is disposed in the tip seal groove to be brought into sliding contact with the end plate of the mating scroll, the tip seal is divided into two seals having different sizes. The large and small seal members are arranged so that the small seal member is positioned on the bottom surface side of the chip seal groove with respect to the large seal member in the chip seal groove, and the large seal member and A space into which the compressed air flows is formed between the bottom surface of the chip seal groove.

Specifically, in the present invention, the following configuration is preferable.
(1) The tip wall of the wrap is provided with a through hole that penetrates into the tip seal groove, and the compressed air is sent from the through hole in the longitudinal direction of the tip seal groove.
(2) The through hole is provided at a position where the compressed air enters the bottom surface of the large seal member in the tip seal groove.

In the present invention, the following configuration is preferable.
(1) The large and small seal members are integrally formed in a strip shape arranged along the chip seal groove.
(2) The large seal member is integrally formed in a strip shape arranged along the chip seal groove, and the small seal member is a plurality of strips arranged at intervals along the chip seal groove. Is formed.

  As described above, the scroll compressor according to the present invention includes the fixed scroll and the orbiting scroll that form a compression space by meshing the spiral wraps with each other, and the tip of at least one of the fixed scroll and the orbiting scroll. A chip seal groove is provided on the surface, and a chip seal is disposed in the chip seal groove so as to be slidably contacted with an end plate of the other scroll, and the chip seal is composed of two seal members having different sizes. The large seal member and the chip seal are arranged so that the small seal member is positioned on the bottom surface side of the chip seal groove with respect to the large seal member in the chip seal groove. Since a space for compressed air to flow is formed between the bottom surface of the groove, the large seal member constituting the chip seal is compressed air. By it is possible to float the end plate side of the mating scroll, even tip seal is worn it can always contact the tips of the large seal member. Therefore, in the scroll type compressor of the present invention, it is possible to reliably prevent the compressed air from leaking between the tip seal and the end plate, and to improve the compression performance.

  In the scroll compressor according to the present invention, the tip wall of the wrap is provided with a through hole penetrating into the tip seal groove, and the compressed air is fed into the longitudinal direction of the tip seal groove from the through hole. Further, since the compressed air is provided at a position where the compressed air enters the bottom surface of the large seal member in the chip seal groove, the compressed air is forcibly fed to a necessary place. The large seal member can be stably levitated to the end plate side of the other scroll, and the sealing performance of the chip seal can be further enhanced.

  Further, in the scroll compressor according to the present invention, the large and small seal members are integrally formed in a strip shape disposed along the chip seal groove, or the large seal member is formed along the chip seal groove. Since the small seal member is formed in a plurality of strips arranged at intervals along the chip seal groove, the large and small seal members can be easily manufactured. Can do.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First embodiment]
FIG. 1 is a partial perspective view of a tip seal applied to a scroll compressor according to a first embodiment of the present invention, and FIGS. 2A to 2E are scrolls in which the tip seal of the present embodiment is a mating side. It is sectional drawing which shows the process slidably contacted with the end plate. In addition, the same code | symbol is attached | subjected to the site | part same as the prior art example shown in FIG. 4, and description is abbreviate | omitted.
The tip seal 21 of this embodiment shown in FIG. 1 is composed of two seal members 22 and 23 having different widths. These large and small seal members 22 and 23 are wraps 2b and 3b of the fixed scroll 2 and the orbiting scroll 3. Are disposed in chip seal grooves 2d and 3d having a substantially U-shaped cross section provided on the front end surface. Moreover, the large and small seal members 22 and 23 are positioned so that the small seal member 23 is positioned on the bottom surface side (lower side in the drawing) of the chip seal grooves 2d and 3d with respect to the large seal member 22 in the chip seal grooves 2d and 3d. Are arranged in layers.

  The relationship between the width dimension of the large and small seal members 22 and 23 and the width dimension of the chip seal grooves 2d and 3d is that the width of the large seal member 22 is slightly smaller than the width of the chip seal grooves 2d and 3d. Is set so that compressed air A from the higher stage can pass between the side surface of the large seal member 22 and the inner wall surface of the seal grooves 2d, 3d. Has been. Further, the width of the small seal member 23 is smaller than the width of the large seal member 22, and the small seal member 23 serves as a spacer, and a space S is formed between the bottom surface of the large seal member 22 and the bottom surfaces of the chip seal grooves 2d and 3d. Compressed air A from the high stage side flows into the space S, and the large seal member 22 is set to float toward the end plate of the mating scroll.

  On the other hand, the large and small seal members 22 and 23 of the present embodiment are integrally formed in a strip shape arranged along the spiral chip seal grooves 2d and 3d in plan view. Further, the thickness in the vertical direction of the large and small seal members 22 and 23 is substantially the same as the depth of the chip seal grooves 2d and 3d in a state in which both the seal members are arranged in the chip seal grooves 2d and 3d. The upper surface of the seal member 22 and the upper surfaces of the chip seal grooves 2d and 3d are formed to be flush with each other.

  In the scroll compressor according to the first embodiment of the present invention configured as described above, as shown in FIG. 2 (A), the fixed scroll 2 and the orbiting scroll 3 showing only a part are in a sealed container (not shown). The wrap 2b of the fixed scroll 2 and the end plate 3a of the orbiting scroll 3 are arranged to face each other with a gap (see FIGS. 4 and 5). When the scroll compressor of this embodiment is operated in this state, as shown in FIG. 2 (B), the compressed air A crosses the wrap 2b and the lateral direction (chip seal) from the high stage side to the low stage side as indicated by the arrow. It flows in the direction orthogonal to the extending direction of the groove 2d) and tries to leak through the tip of the wrap 2b. Along with this, as shown by an arrow F in FIG. 2C, the large seal member 22 of the tip seal 2 in the tip seal groove 2d is floated by the compressed air A.

  When the large seal member 22 floats, a space S is formed between the bottom surface of the large seal member 22 and the bottom surface of the chip seal groove 2d, as shown in FIG. For this reason, the compressed air A from the high stage side flows into the space S, and the large seal member 22 further floats toward the end plate 3a of the orbiting scroll 3 on the counterpart side. The compressed air A flowing into the space S presses the bottom surface of the large seal member 22 in the direction of arrow F (see FIG. 2C) as shown in FIG. The front end surface is pressed against the end plate 3a of the orbiting scroll 3, and the gap between the wrap 2b of the fixed scroll 2 and the end plate 3a of the orbiting scroll 3 is closed to prevent the front end leakage of the compressed air A to the lower stage side. It will be. The large seal member 22 of the tip seal 21 arranged in the tip seal groove 3d of the orbiting scroll 3 performs the same operation and action.

  As described above, according to the scroll compressor of the first embodiment of the present invention, the chip seal 21 is configured by the two seal members 22 and 23 having different widths, and the small seal member is disposed in the chip seal grooves 2d and 3d. The large and small seal members 22 and 23 are arranged so that 23 is positioned on the bottom surface side of the chip seal grooves 2d and 3d with respect to the large seal member 22, and the bottom surface of the large seal member 22 and the bottom surfaces of the chip seal grooves 2d and 3d Since the space S into which the compressed air A flows is formed between the large-seal member 22 in the tip seal groove 2d of the fixed scroll 2, for example, the opposite-side orbiting scroll facing the high-stage compressed air A 3 can be levitated to the end plate 3a side. Therefore, even if the tip seal 21 is worn over time due to the operation of the scroll compressor, the tip of the large seal member 22 can always be pressed against and contacted with the end plate 3a of the other orbiting scroll 3. It is possible to reliably prevent the compressed air A from leaking from the end of the large seal member 22 of the seal 21 and the end plates 2a and 3a to the low stage side, and to improve the compression performance of the scroll compressor.

[Second Embodiment]
FIG. 3 is a partial perspective view of a tip seal applied to a scroll compressor according to the second embodiment of the present invention.
In the second embodiment, a through hole 24 is added to the configuration of the first embodiment. That is, through holes 24 penetrating into the tip seal grooves 2d and 3d are provided in the tip walls of the wraps 2b and 3b of the fixed scroll 2 and the orbiting scroll 3, and compressed air at a higher stage than the through holes 24 is provided. A is configured to be fed through the space S in the longitudinal direction (extending direction) of the chip seal grooves 2d and 3d. In addition, the through hole 24 is provided at a position where the compressed air A enters the bottom surface of the large seal member 22 in the chip seal grooves 2d and 3d. Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

  According to the scroll type compressor of the second embodiment, since the compressed air A is forcibly sent to a necessary portion in the longitudinal direction of the tip seal 21, the transverse direction (perpendicular to the extending direction of the tip seal groove 2d) is used. The large seal member 22 can be stably floated together with the compressed air A that has flowed into the space S from the direction in which the end of the scrolls 2 and 3 on the mating side. It can be firmly pressed against the plates 2a and 3a, and the sealing performance of the chip seal 21 can be further enhanced.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

  For example, in the first and second embodiments, the large and small seal members 22 and 23 of the chip seal 21 are formed in a band shape, but the large seal member 22 is disposed along the chip seal grooves 2d and 3d. The small seal member 23 may be formed in a plurality of strips arranged at intervals along the chip seal grooves 2d and 3d. Further, in the first embodiment and the second embodiment, a through-hole penetrating into the chip seal grooves 2d and 3d may be provided on the side wall surface facing the higher stage of the wraps 2b and 3b.

1 is a perspective view showing a part of a chip seal applied to a scroll compressor according to a first embodiment of the present invention. (A)-(E) is sectional drawing which shows the process in which the chip seal of the said 1st Embodiment slidably contacts with the end plate of the other party's scroll. It is a perspective view which shows a part of chip | tip seal | sticker vicinity of the lap | tip tip applied to the scroll type compressor which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows a part of conventional scroll type compressor. It is sectional drawing which expands and shows the principal part of the conventional scroll compressor. It is a disassembled perspective view which shows the wrap and wrap seal of the conventional scroll type compressor.

Explanation of symbols

2 fixed scroll 3 orbiting scroll 2a, 3a end plate 2b, 3b wrap 2d, 3d tip seal groove 21 tip seal 22 large seal member 23 small seal member 24 through hole A compressed air S space

Claims (5)

  The fixed scroll and the orbiting scroll that form a compression space by meshing the spiral wraps with each other are provided, and a tip seal groove is provided on a tip surface of at least one of the fixed scroll and the orbiting scroll, and the tip seal groove is provided in the tip seal groove. In the scroll type compressor in which the tip seal that is brought into sliding contact with the end plate of the other side scroll is arranged, the tip seal is constituted by two seal members having different sizes, and the small seal member is disposed in the tip seal groove. The large and small seal members are arranged so as to be positioned on the bottom surface side of the chip seal groove with respect to the large seal member, and a space where compressed air flows between the large seal member and the bottom surface of the chip seal groove A scroll compressor characterized by being formed.   The tip wall of the wrap is provided with a through-hole penetrating into the tip seal groove, and the compressed air is sent from the through-hole to the longitudinal direction of the tip seal groove. The scroll compressor according to claim 1.   The scroll compressor according to claim 2, wherein the through hole is provided at a position where the compressed air enters a bottom surface of the large seal member in the tip seal groove.   The scroll compressor according to any one of claims 1 to 3, wherein the large and small seal members are integrally formed in a band shape disposed along the chip seal groove.   The large seal member is integrally formed in a strip shape arranged along the chip seal groove, and the small seal member is formed in a plurality of strips arranged at intervals along the chip seal groove. The scroll compressor according to any one of claims 1 to 3, wherein the scroll compressor is provided.

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