JP3338568B2 - Scroll type fluid machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine suitable for use in, for example, an air compressor or a vacuum pump, and more particularly, to a seal between a tooth tip side of a lap portion and a tooth bottom surface of a counterpart. The present invention relates to a scroll-type fluid machine that hermetically seals.

[0002]

2. Description of the Related Art In general, a casing, a fixed scroll provided integrally with the casing and having a spiral wrap portion erected on the tooth bottom surface of a head plate, and revolving in the casing facing the fixed scroll. A revolving scroll in which a spiral wrap portion is provided upright so as to define a plurality of compression chambers between the wrap portion of the fixed scroll on the tooth bottom surface of the end plate, and the casing can be rotated. And a drive shaft connected to the orbiting scroll via a orbiting bearing at a tip end side, and at least one of the wrapping portions of the fixed scroll and the orbiting scroll has the wrapping portion. 2. Description of the Related Art A scroll-type fluid machine is known in which a groove is formed extending along the tooth tip of a scroll, and a seal member is provided in the groove so as to slidably contact the bottom surface of the other tooth.

In this type of scroll fluid machine according to the prior art, the base end of a drive shaft protruding out of the casing is rotationally driven by a drive source such as a motor, so that the rotation is transmitted from a crank of the drive shaft to a slewing bearing. To the orbiting scroll, and the orbiting scroll is orbited around the drive shaft with a constant orbital radius.

When used as a scroll-type air compressor, for example, a plurality of compression chambers defined between the wrap portions of the fixed scroll and the orbiting scroll are continuously reduced by the orbiting motion of the orbiting scroll. , While sequentially compressing the air sucked from the suction port in each compression chamber,
The compressed air is discharged from a discharge port toward an external air tank or the like.

In this case, a part of the compressed air intrudes from the compression chamber into the groove formed in the tooth tip of the lap portion between the seal member and the seal member, and the pressure of the compressed air acts on the seal member. Then, the sealing member is pressed toward the tooth bottom of the other party. As a result, the seal member floats in the concave groove to perform floating seal so as to slide on the mating tooth bottom surface, and hermetically seals between adjacent compression chambers via each wrap portion.

However, in the scroll type air compressor according to the prior art described above, the seal member is floated in the groove by utilizing the pressure of the compressed air which has entered the groove from each compression chamber, and a so-called floating seal is formed. Since the sealing is only performed, a gap is formed between the seal member and the side surface and the bottom surface of the concave groove when the seal member floats toward the tooth bottom surface of the partner. The gap communicates from the inner circumferential side of the wrap portion to the outer circumferential side of the wrap portion over the entire circumference in the spiral direction (circumferential direction). Compressed air leaks to the outer periphery through this gap, and the compression performance (compression efficiency)
Is reduced.

Therefore, in order to solve the above problem,
For example, Japanese Utility Model Laid-Open No. 2-147787, Japanese Utility Model Laid-Open No. 2-14
Patent No. 7888, JP-A-3-11101, etc. (hereinafter referred to as other prior art)
Then, a plurality of cuts are made in the side and bottom sides of the seal member in the longitudinal direction of the seal member, respectively, apart from each other in the longitudinal direction, so that a plurality of side lip portions and a plurality of bottom surfaces are formed on the side and bottom sides of the seal member. The side lip portion is formed integrally.

In another conventional technique, the side lip portion and the bottom side lip portion are elastically deformed by the pressure of compressed air which has entered the groove, and the leading end is formed on the side surface and the bottom side of the groove. , The gap formed in the circumferential direction between the side and bottom surfaces of the groove and the sealing member is blocked, and the gap is transmitted from the high-pressure side compression chamber to the low-pressure side through this gap. Compressed air is prevented from leaking to the outer peripheral side toward the compression chamber.

[0009]

In the other prior art described above, by making cuts at regular intervals on the side and bottom sides of the seal member made of an elastic resin material, the seal member is extended over the entire length. A plurality of side lip portions and a plurality of bottom lip portions are formed on the side surface and the bottom surface side of the seal member, respectively, and the tip side of each lip portion is opened by processing. There is a problem.

That is, when the sealing member is inserted into the concave groove formed at the tooth tip of the lap portion, each side lip portion comes into contact with the side surface of the concave groove so as to protrude, and sliding (friction) between the two lip portions.
Since the resistance increases, the sealing member is floated (floated) in the concave groove by using the pressure of the compressed air that has entered the concave groove from each compression chamber, and the gap between the sealing member and the tooth bottom surface of the partner is made by the seal member. When trying to seal, on the outer peripheral side of the wrap portion where the differential pressure between the compression chambers is small, it is difficult to float the sealing member from the inside of the concave groove, and the outer peripheral side compression chambers are not necessarily airtight. There is a problem that cannot be sealed.

When the width of the sealing member is made smaller than that of the groove or the width of the groove is increased so as to eliminate the tension of the side lip portions, the side surface of the groove is sealed with the sealing member. The gap between the members becomes large, the sealing action by each side lip is lost, and compressed air leaks from the high-pressure side compression chamber to the low-pressure side compression chamber to the outer peripheral side through this gap. There's a problem.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention utilizes the pressure that has entered the groove to ensure that the seal member floats in the groove. The seal member can effectively seal the gap between the tooth bottom surface of the counterpart and the seal member, and can effectively prevent the pressure from leaking from the compression chamber on the high pressure side to the compression chamber on the low pressure side. It is an object of the present invention to provide a scroll fluid machine which can be improved.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a fixed scroll in which a spiral wrap portion is provided upright on a tooth bottom surface of a head plate, and is provided to face the fixed scroll, A revolving scroll in which a spiral wrap portion is provided upright so as to define a plurality of compression chambers between the wrap portion of the fixed scroll and the wrap portion of the fixed scroll on the bottom surface of the end plate, and the wrap between the revolving scroll and the fixed scroll is provided. A scroll type fluid having at least one of the wrap portions formed with a concave groove extending along the tooth tip of the lap portion, and a seal member slidably in contact with a mating tooth bottom surface in the concave groove. Applied to machine.

A feature of the structure adopted by the first aspect of the present invention is that a plurality of seal members are formed apart from each other in a longitudinal direction of the seal member, and each of the plurality of seal members is in contact with a bottom surface of the concave groove. A bottom side lip portion and a plurality of side lip portions formed apart from each other in a length direction of the seal member and in contact with side surfaces of the concave groove are provided, and each side lip portion is provided on a side surface of the seal member. The configuration is such that the seal member is formed excluding a portion extending over a certain range from the outermost end.

In this case, the respective side lip portions are formed at predetermined intervals on the side surfaces of the seal member on the inner peripheral side along the spiral direction of the wrap portion. Is preferred.

Further, as in the third aspect of the present invention, each of the side lip portions is located at one end from the outermost peripheral end of the seal member.
It is good to form it in the place except the range before and after winding.

Furthermore, as in the invention according to claim 4,
Each of the side lip portions may be formed at a location excluding a range of 5/4 or less from the outermost end of the seal member.

[0018]

According to the first aspect of the present invention,
Since a side lip portion that contacts the side surface of the concave groove is not provided at a location that extends over a certain range from the outermost end of the seal member, at a location that extends over a certain range from the outermost end of the seal member, the sealing member A small gap can be secured between the groove and the side surface of the concave groove, and the sliding (friction) resistance between the two can be greatly reduced. Therefore, even at the outermost peripheral side of the wrap portion where the differential pressure between the compression chambers is small, the seal member can be reliably lifted (floated) from the inside of the groove by using the pressure penetrating into the groove from each compression chamber. Can be.

In this case, each side lip portion is formed at a predetermined interval on the side surface of the seal member on the inner peripheral side along the spiral direction of the wrap portion. Thereby, even if the seal member is pressed from the inner peripheral side in the spiral direction toward the outer peripheral side by the pressure from the compression chamber, even if a gap is formed between the side surface serving as the inner peripheral side of the seal member and the concave groove, This gap can be reliably blocked by each side lip.

According to the third aspect of the present invention, the range in which the side lip portions are not provided is a range extending one turn before and after the outermost peripheral end of the seal member, so that the seal member is recessed. In addition to being able to reliably float (float) from the inside of the groove and slidingly contact the tooth bottom surface of the counterpart, in a place exceeding approximately one turn from the outermost peripheral end of the seal member, each side lip portion is attached to the side surface of the groove. Contact can be made, and the gap between the groove and the seal member can be reliably sealed.

Further, as in the invention according to claim 4,
By setting the range in which the side lip portions are not provided to a range of 5/4 turn or less from the outermost peripheral end of the seal member, the seal member is reliably lifted (floated) from the inside of the concave groove, and the mating tooth is formed. In addition to being able to make sliding contact with the bottom surface, at a point exceeding, for example, 5/4 turn from the outermost peripheral end of the seal member, each side lip portion can be brought into contact with the side surface of the concave groove, and Can be reliably sealed.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A scroll type fluid machine according to an embodiment of the present invention will be described below with reference to FIGS.

In the drawing, reference numeral 1 denotes a fixed scroll which is a part of a casing of the scroll type air compressor,
The fixed scroll 1 covers an opening end side of a casing body (not shown) formed in a substantially closed cylindrical shape,
It is fixed to the opening end side. The center of the fixed scroll 1 has an axis O1−
A disk-shaped end plate 2 disposed so as to coincide with O1; and a spiral wrap portion 3 erected on a tooth bottom surface 2A of the end plate 2
And a support portion 4 which is located on the outer peripheral side of the end plate 2 and is formed in a cylindrical shape so as to surround the wrap portion 3.

As shown in FIGS. 2 and 3, the wrap portion 3 of the fixed scroll 1 has a winding start end at the innermost peripheral end and a winding end at the outermost peripheral end. It is formed in a spiral shape. And the tooth tip 3A of the wrap portion 3 is
The orbiting scroll 9 is separated from a tooth bottom surface 10A described later with a small clearance (gap).

Reference numeral 5 denotes a concave groove formed on the tooth tip 3A side of the wrap portion 3, and the concave groove 5 is located at an intermediate portion of the wrap portion 3 in the width direction so that the cross section thereof has a substantially U-shape. The bottom surface 5A and the left and right side surfaces 5B, 5C extend from the winding start end to the winding end along the spiral shape of the wrap portion 3. A sealing member 6 described later is mounted in the concave groove 5 so as to seal the space between the revolving scroll 9 and the tooth bottom surface 10A.

Reference numeral 6 denotes a sealing member mounted in the concave groove 5 of the wrap portion 3. The sealing member 6 is made of an elastic resin material excellent in abrasion resistance and slidability, for example, polytetrafluoroethylene (PTFE) or the like. Fluororesin, polyethersulfone (PES), polyphenylene sulfide (PP
S), is formed as a long chip seal having a rectangular cross section using polyetheretherketone (PEEK), liquid crystal polymer (LCP), polysulfone (PSF), or the like. Extend spirally along.

Here, the sealing member 6 slides on the lower surface 6A as a pressure receiving surface mounted on the bottom surface 5A of the concave groove 5, and the lower surface 6A in the up-down direction and on the other tooth bottom surface 10A. It is composed of an upper side surface 6B that is in contact with the inner side surface 6C and an outer side surface 6D that face the side surfaces 5B and 5C of the concave groove 5 and are located inside and outside in the radial direction of the spiral-shaped seal member 6. The inner surface 6C and the outer surface 6D of the sealing member 6 are inserted into the groove 5 with a slight gap so that the lower surface 6A is placed on the bottom surface 5A of the groove 5. It is possible to float from above 5A toward the tooth bottom surface 10A of the orbiting scroll 9 which is the other party.

Numerals 7, 7,... Denote bottom lip portions integrally formed on the lower surface 6A of the seal member 6, and each of the lip portions 7 on the lower surface 6A of the seal member 6 as shown in FIG.
It is formed as a thin-walled lip by making cuts at regular intervals along the length direction,
The tip side is a free end. The bottom side lip portions 7 are disposed at regular intervals over the entire length of the seal member 6 from the innermost peripheral end to the outermost peripheral end of the seal member 6, and the distal end thereof is elastically attached to the bottom surface 5 </ b> A of the concave groove 5. , A seal is provided between the bottom surface 5A of the concave groove 5 and the seal member 6.

Reference numerals 8, 8,... Denote side lip portions integrally formed on the inner surface 6C of the seal member 6, and the respective side lip portions 8 are formed on the inner surface 6A of the seal member 6 as shown in FIGS. ,
It is formed as a thin-walled lip by making cuts at regular intervals along the length direction,
The tip side is a free end. Here, the side lip portions 8 are arranged at regular intervals in the length direction of the seal member 6 from the innermost peripheral end of the seal member 6 toward the outer peripheral side. A certain range before and after one turn from the outermost end of the seal member 6 (for example, a range extending over 3/4 turn or more from the outermost end of the seal member 6,
Alternatively, the seal member 6 is formed only at a position excluding the outermost peripheral end of the seal member 6 (a range extending 5/4 or less).

Each of the side lip portions 8 is located at a position excluding a region approximately one turn before and after the outermost end of the seal member 6, as shown in FIG. By elastically contacting the side surface 5B of the groove 5, the groove 5
Is sealed between the side surface 5B and the seal member 6. Further, the inner side surface 6C extending from the outermost end of the seal member 6 approximately one turn before and after one turn forms a minute gap S with the side surface 5B of the concave groove 5 as shown in FIG. The gap S extends along the spiral direction of the wrap portion 3, for example, from the outermost end of the seal member 6 over a range of ／ to ／.

Reference numeral 9 denotes an orbiting scroll which is provided in the casing main body so as to be capable of orbiting in opposition to the fixed scroll 1. The orbiting scroll 9 has a disk-shaped end plate 10 having a tooth bottom surface 10A on the surface side. A wrap portion 11 erected from the tooth bottom surface 10A of the end plate 10 toward the end plate 2 of the fixed scroll 1 and formed in a spiral shape like the wrap portion 3 of the fixed scroll 1; A boss 12 is provided at the center, and the boss 12 is rotatably attached to a crank 15A of a drive shaft 15 described later.

Here, the wrap portion 1 of the orbiting scroll 9
4, is formed in a spiral shape, for example, before and after three turns, similarly to the wrap portion 3 of the fixed scroll 1, as shown in FIG.
A concave groove 13 having a U-shaped cross section is formed on the tooth tip 11A side similarly to the wrap portion 3 on the fixed scroll 1 side.

Reference numeral 14 denotes another sealing member mounted in the concave groove 13 on the orbiting scroll 9 side. The sealing member 14 is the same as the above-described sealing member 6 on the fixed scroll 1 side.
It is formed as a long chip seal having a rectangular cross section, and can float up from the concave groove 13 toward the tooth bottom surface 2A of the fixed scroll 1 which is the partner. Further, similarly to the seal member 6 on the fixed scroll 1 side, each side lip portion and each bottom side lip portion (both not shown) are formed on the seal member 14, and these lip portions are concave grooves. A seal is provided between the side and bottom sides of the seal 13 and the seal member 14.

Reference numeral 15 denotes a drive shaft rotatably provided on the casing main body. The drive shaft 15 is a crank 15A having a tip end extending into the casing main body, and the axis of the crank 15A is the axis of the drive shaft 15. O1-
It is eccentric by a predetermined dimension δ with respect to O1. The boss 12 of the orbiting scroll 9 is attached to the crank 15A of the drive shaft 15 via a orbiting bearing 16 so as to be able to orbit, and the orbiting scroll 9 is orbited through a rotation preventing mechanism (not shown) or the like. Is given.

Further, the fixed scroll 1 and the orbiting scroll 9 are arranged such that the axis O2-O2 is eccentric with respect to the axis O1-O1 by the dimension δ, and the wrap portion 1 of the orbiting scroll 9 is formed.
1 is disposed so as to overlap the wrap portion 3 of the fixed scroll 1. Thus, when the orbiting scroll 9 is turned with respect to the fixed scroll 1, a plurality of compression chambers 17, 17,... It has become so.

Reference numerals 18 and 19 denote a suction port and a discharge port formed in the fixed scroll 1. The suction port 18 is formed on the outer peripheral side of the end plate 2 so as to communicate with the compression chamber 17 on the compression chamber side. The port 19 is connected to the innermost compression chamber 17.
A hole is formed in the center of the end plate 2 so as to communicate with the end plate 2.

The scroll type air compressor according to the present embodiment has the above-described configuration, and its operation will be described below.

First, when the drive shaft 15 is driven to rotate by a drive source (not shown) such as a motor from the outside of the casing, this rotation is transmitted from the crank 15A of the drive shaft 15 to the orbiting scroll 9 via the orbit bearing 16. The orbiting scroll 9 makes a revolving motion having a revolving radius of dimension δ about the axis O1 -O1 of the drive shaft 15.

The compression chambers 17, 17,... Defined between the wrap portions 3, 11 by this swirling motion are continuously reduced toward the center side, and the air sucked from the suction port 18 is sequentially reduced. The compressed air is discharged from the discharge port 1 while being compressed.
9 to an external air tank (not shown) or the like.

Here, when the compression operation is started, a part of the compressed air enters from the high pressure side compression chamber 17 into the concave grooves 5 and 13 of the wrap portions 3 and 11, for example, the fixed scroll 1 side. The sealing member 6 receives the pressure of the compressed air at the lower side surface 6A serving as a pressure receiving surface, and thereby the end plate 1 serving as a counterpart is received.
Floating (floating) from the inside of the concave groove 5 so as to be in sliding contact with the tooth bottom surface 10A of 0, and hermetically seal between the adjacent compression chambers 17 via the wrap portions 3 and 11. The same applies to the seal member 14 on the orbiting scroll 9 side.

The bottom lip portion 7 and the side lip portion 8 formed on the seal member 6 (14) are formed with the concave grooves 5 (1).
3) It is elastically deformed by the pressure of the compressed air which has entered into the inside, and its tip side slides on the bottom surface 5A and the side surface 5B of the concave groove 5 (13), respectively.
A gap formed between the side surface 5B and the sealing member 6 (14) in the circumferential direction is blocked, and compressed air flows from the high-pressure side compression chamber 17 to the low-pressure side compression chamber 17 through this gap. Prevents leakage to the outer periphery.

When the side lips 8, 8,... Are formed over the entire length of the seal member 6 (14), when the seal member 6 (14) is inserted into the concave groove 5 (13), For example, the tip side of each side lip 8 is the side surface 5 of the concave groove 5.
B makes contact with it so that the sliding (friction) resistance between them becomes large. Then, the concave groove 5 (1
3) When the sealing member 6 (14) is floated by using the pressure of the compressed air that has entered into the interior, and when the seal member 6 (14) is to be sealed with the mating tooth bottom surface 10A (2A), each compression chamber is required. Lapping part 3 (11) with small differential pressure between 17
On the outer peripheral side of the seal member 6 (14), the concave groove 5 (13)
It becomes difficult to float from inside, and the compression performance cannot always be improved.

Therefore, the present inventors, for example,
The formation of the side lip portions 8, 8,... Only at locations other than the outermost peripheral side of the seal member 6 mounted in the concave groove 5 on the outer peripheral side was examined. Then, as shown in FIG. 6, the area where the side lip portion 8 and the like are not provided is gradually expanded from the outermost end of the seal member 6 to 1/4, 2/4,. The compression operation of the air compressor was actually performed, and the compression performance (compression efficiency) in each case was obtained as experimental data.

As a result, when the area where the side lip portion 8 and the like are not provided is set to 3/4 or more from the outermost end of the seal member 6 (14), the floating property of the seal member 6 (14) is improved. Sufficient compression performance (compression efficiency) can be obtained, the compression performance (compression efficiency) can be maximized when about one turn from the outermost end, and, for example, the outermost end of the seal member 6 (14). , The compression performance (compression efficiency) gradually decreases in the range exceeding 5/4 turns.

Therefore, in the present embodiment, the sealing member 6 (1
4) Each side lip portion only at a position excluding a certain range before and after one turn from the outermost end (for example, a range ranging from 3/4 to 5/4 turn from the outermost end of the seal member 6 (14)). 8 and so on, one turn before the outermost end of the seal member 6 (14),
At the subsequent portion, as illustrated in FIG.
A minute gap S extending continuously along the spiral direction of the wrap portion 3 is formed between B and the inner surface 6C.

As a result, when the seal member 6 (14) is inserted into the groove 5 (13), the seal member 6 (1)
4), at a position extending one turn before and after the outermost end, for example, a minute gap S continuously extending between the side surface 5B and the inner side surface 6C of the concave groove 5 can be secured, and each side lip portion 8 is concave. Groove 5
Will not elastically contact the side surface 5B of
The sliding (friction) resistance between the two can be greatly reduced.

Thus, according to the present embodiment, each compression chamber 1
7, the pressure of the compressed air that enters the groove 5 (13),
When the sealing member 6 (14) is floated (floated) from the inside of the concave groove 5 (13) to seal between the counterpart tooth bottom surface 10 </ b> A (2 </ b> A), the wrap portion 3 having a small differential pressure between the compression chambers 17. Also on the outer peripheral side of (11), the sealing member 6 (1
4) can be reliably floated from the inside of the concave groove 5 (13), and compressed air is supplied between the compression chambers 17 on the outer peripheral side, which is approximately one turn before and after the outermost peripheral end of the wrap portion 3 (11). Can be effectively prevented from leaking out.

Therefore, according to the present embodiment, the groove 5 (1
3) The seal member 6 (14) can be stably and surely levitated (floated) from the concave groove 5 (13) by utilizing the pressure of the compressed air entering the inside.
According to (14), it is possible to effectively seal the space between the tooth bottom surface 10A (2A) of the partner and to effectively prevent the compressed air from leaking from the compression chamber 17 on the high pressure side to the compression chamber 17 on the low pressure side. Thus, the compression performance can be reliably improved.

The inner surface 6C of the sealing member 6 (14)
For example, since it is not necessary to provide the side lip portion 8 or the like in a range extending from the outermost end to 3/4 to 5/4 turns, the number of lip portions to be processed can be reduced, and workability at the time of processing can be improved. Various effects such as improvement and cost reduction can be achieved.

In the above embodiment, the range in which the side lip portion 8 and the like are not provided is one turn before and after (for example, 3/4 to 5/4) from the outermost end of the seal member 6 (14). However, the present invention is not limited to this, and the present invention is not limited to this, and a certain range (for example, a range extending over 2/4 turns or more from the outermost end, or 6 mm from the outermost end) of the seal member 6 (14).
Except for / 4 (3/2) turns or less), each side lip 8 or the like may be formed on the inner surface of the seal member 6 (14).

In the above embodiment, the fixed scroll 1
The groove 5 and the groove 13 are formed in the wrap portion 3 and the wrap 11 of the orbiting scroll 9, respectively, and the sealing members 6 and 14 are mounted in the groove 5 and the groove 13, respectively. Alternatively, the seal member may be provided on only one of the wrap portion 3 of the fixed scroll 1 and the wrap portion 11 of the orbiting scroll 9.

Further, in the above embodiment, the case where the scroll type fluid machine is used as the scroll type air compressor has been described as an example. However, the present invention is not limited to this, and is applied to, for example, a vacuum pump, a refrigerant compressor and the like. It may be.

[0053]

As described above in detail, according to the present invention, as described in claim 1, each side lip portion contacting the side surface of the concave groove is formed at a position extending over a predetermined range from the outermost peripheral end of the seal member. Since it is formed by removing it, a small gap can be secured between the seal member and the side surface of the concave groove at a portion extending from the outermost end of the seal member to a certain range, and sliding (friction) between the two members can be ensured. Resistance can be greatly reduced. Therefore, even at the outermost peripheral side of the wrap portion where the differential pressure between the compression chambers is small, the sealing member is stably and reliably floated from the inside of the groove by utilizing the pressure that enters the groove from each compression chamber. ), The seal member can effectively seal the gap between the other tooth bottom and the compressed air can be effectively prevented from leaking from the high-pressure side compression chamber to the low-pressure side compression chamber, Compression performance can be reliably improved. Further, the number of lip portions to be processed can be reduced, workability during processing can be improved, and cost can be reduced.

In this case, according to the second aspect of the invention, the side lip portions are formed at predetermined intervals on the side surfaces of the seal member on the inner peripheral side along the spiral direction of the wrap portion. The seal member is pressed from the inner peripheral side in the spiral direction to the outer peripheral side by the pressure from the compression chamber,
Even when a gap is formed between the inner peripheral side surface of the seal member and the concave groove, the gap can be reliably blocked by each side lip portion, and the gap between the concave groove and the seal member is sealed and compressed. Performance can be effectively improved.

Further, according to the present invention, the range in which the side lip portions are not provided is a range extending one turn before and after the outermost peripheral end of the seal member, so that the seal member is recessed. In addition to being able to float more stably from the inside of the groove and to be in sliding contact with the tooth bottom surface of the mating member, each side lip portion is formed with a concave groove at a position exceeding approximately one turn from the outermost peripheral end of the seal member. By contacting the side surface, the gap between the concave groove and the seal member can be reliably sealed, and the compression performance can be further stabilized and improved.

Further, as in the invention according to claim 4,
By setting the range in which the side lip portions are not provided to a range extending from the outermost end of the seal member to 5/4 turn or less, the seal member can be stably floated from the inside of the concave groove. In addition to being able to make sliding contact with the tooth bottom surface of the seal member, at a point exceeding, for example, 5/4 turn from the outermost peripheral end of the seal member, each side lip portion is brought into contact with the side surface of the groove so that the groove and the seal member And the compression performance can be stabilized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a fixed scroll, an orbiting scroll, respective seal members and the like of a scroll type air compressor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a wrap portion and a seal member of the fixed scroll in an enlarged manner.

FIG. 3 is an enlarged sectional view taken in the direction of arrows III-III in FIG.

FIG. 4 is an enlarged view of a main part in FIG. 3 showing a side lip portion and the like of a seal member mounted in a concave groove at an intermediate portion side of the wrap portion.

5 is an enlarged view of a main part in FIG. 3 showing a seal member and the like mounted in a concave groove on the outermost peripheral side of a wrap portion.

FIG. 6 is a characteristic diagram illustrating a relationship between a range where a side lip is not provided and a compression efficiency.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed scroll 2,10 End plate 2A, 10A Tooth bottom surface 3,11 Lapping part 5,13 Concave groove 5A Bottom surface 5B, 5C Side surface 6,14 Seal member 6A Lower surface (pressure receiving surface) 6B Upper surface (sliding contact surface) 6C Side 6D Outer side 7 Bottom side lip 8 Side lip 9 Orbiting scroll 15 Drive shaft 17 Compression chamber 18 Suction port 19 Discharge port

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-11101 (JP, A) JP-A-3-172501 (JP, A) JP-A-63-6701 (JP, A) 147888 (JP, U) Hira 5-58886 (JP, U) Hira 2-147887 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F04C 18/02 311

Claims (4)

(57) [Claims] 1. A fixed scroll having a spiral wrap portion erected on the bottom surface of the end plate and a plurality of fixed scrolls provided opposite to the fixed scroll and provided on the bottom surface of the end plate. A spiral scroll wrap portion is provided upright so as to define a compression chamber, and at least one of the wrap portions of the orbiting scroll and the fixed scroll has a tooth of the wrap portion. In a scroll-type fluid machine having a concave groove extending along the tip and a seal member slidably in contact with a tooth bottom surface of a counterpart in the concave groove, the seal member has a longitudinal direction. A plurality of bottom lip portions formed separately from each other and in contact with the bottom surface of the concave groove, and a plurality of side lips formed separately in the longitudinal direction of the seal member and in contact with the side surface of the concave groove. Department The scroll-type fluid machine is characterized in that each of the side lip portions is formed on a side surface of the seal member except for a portion extending over a predetermined range from the outermost end of the seal member. 2. The scroll-type fluid machine according to claim 1, wherein each of the side lip portions is formed at a predetermined interval on a side surface of a seal member on an inner peripheral side along a spiral direction of the wrap portion. . 3. The scroll-type fluid machine according to claim 1, wherein each of the side lip portions is formed at a position excluding a range extending one turn before and after the outermost end of the seal member. 4. The scroll-type fluid machine according to claim 1, wherein each of the side lip portions is formed at a position excluding a range of 5/4 or less from an outermost end of the seal member.