JPH11280676A - Scroll type fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the post-processing of the seal member while improving the reliability and the abrasion resistance thereof. SOLUTION: A plurality of oval fitting holes 32 are formed in a bottom surface 31A of a groove 31 formed on a lap 3. On the other hand, a plurality of cylindrical projections 34 which can be inserted in the fitting holes 32 are formed on the 33A of a sealing member 33. Moreover, a protruding portion 35 for sealing that extends downward on the inside surface 33C of the sealing member 33 is provided is provided at the position which corresponds to the projection 34. The projection 34 is inserted in the fitting hole 32 with the sealing member 33 installed in the groove 31 of the lap 3. Simultaneously, the protruding portion 35 for sealing is slidably come into contact with the inside surface 31B of the groove 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scroll type fluid machine suitable for use in, for example, an air compressor or a vacuum pump.

[0002]

2. Description of the Related Art As a prior art, for example, Japanese Unexamined Patent Publication No.
A scroll type fluid machine described in Japanese Patent Publication No. 101 is known. Here, an air compressor as a scroll type fluid machine will be described as an example with reference to FIGS.

In the drawing, reference numeral 1 denotes a fixed scroll fixed to a casing (not shown) of the scroll-type air compressor. The fixed scroll 1 is formed of a casing (not shown) formed in a substantially closed cylindrical shape. It is fixed to the opening end side so as to cover the opening end side. The center of the fixed scroll 1 has an axis O of a drive shaft 17 described later.
1-O1 a disc-shaped end plate 2 arranged to match
A spiral wrap portion 3 erected on the tooth bottom surface 2A of the end plate 2; and a cylindrical support portion 4 located on the outer peripheral side of the end plate 2 and surrounding the wrap portion 3. Approximately.

The wrap portion 3 of the fixed scroll 1
As shown in FIG. 16, the inner peripheral side is an inner end and the outer peripheral side (not shown) is an outer end. And the tooth tip 3A of the wrap portion 3 is
As shown in FIG. 17, the orbiting scroll 9 is spaced apart from a tooth bottom surface 10A, which will be described later, with a small clearance ε.

[0005] 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, as shown in FIG.
Is formed at a middle portion in the width direction so that the cross section thereof has a substantially U-shape, and has a bottom surface 5A, an inner side surface 5B, and an outer side surface 5A.
C extends from the inner end to the outer end along the spiral shape of the wrap portion 3. A sealing member 6 to be described later is mounted in the concave groove 5, and a revolving scroll 9 serving as a counterpart is mounted.
Is sealed with 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 formed in a long string shape having a rectangular cross section, and the longitudinal direction of the concave groove 5. Extend spirally along. The seal member 6 is formed using an elastic resin material having excellent wear resistance and slidability, for example, a composite material of polytetrafluoroethylene (PTFE) containing carbon fiber or the like.

As shown in FIG. 17, the seal member 6 has a bottom surface 6A as a pressure receiving surface mounted on the bottom surface 5A of the concave groove 5, and a bottom surface 6A vertically opposed to the bottom surface 6A. It has a sliding contact surface 6B slidingly contacting 10A, an inner surface 6C located radially inside the spiral seal member 6, and an outer surface 6D located radially outside the seal member 6. A bottom lip portion 7 and an inner lip portion 8 described later are integrally formed on the bottom surface 6A and the inner side surface 6C, respectively. The inner surface 6C and the outer surface 6D of the sealing member 6 are inserted into the groove 5 with a small gap so that the bottom surface 6A is placed on the bottom surface 5A of the groove 5.
It is possible to levitate from above toward the tooth bottom surface 10A of the orbiting scroll 9 which is the other party.

Are bottom lip portions formed on the bottom surface 6A of the seal member 6, and the bottom lip portion 7
As shown in the figure, the seal members 6 are provided at predetermined intervals in the longitudinal direction, and are formed by making a cut obliquely on the bottom surface 6A of the seal member 6. Each of the bottom side lip portions 7 is integrated with the seal member 6, and the front end side thereof is a free end and expands from the bottom surface 6 </ b> A of the seal member 6.

Are inner lip portions formed on the inner side surface 6C of the seal member 6, and the inner lip portions 8 are disposed at predetermined intervals in the longitudinal direction of the seal member 6, and In substantially the same manner as the side lip portion 7, the inner surface 6C of the seal member 6 is formed integrally with the seal member 6 by making an oblique cut. The distal end side of the inner lip portion 8 is a free end and expands from the inner side surface 6C of the seal member 6.

Reference numeral 9 denotes an orbiting scroll which is provided to be rotatable in the casing main body so as to face the fixed scroll 1, and the orbiting scroll 9 has a disk-shaped end plate 10 having a tooth bottom 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; And a boss portion 12 provided at the center.
Is rotatably attached to a crank 17A of a drive shaft 17 described later.

Here, the wrap portion 1 of the orbiting scroll 9
As shown in FIG. 16, the spiral 1 is formed in a spiral shape, for example, three and a half turns before and after the same as the wrap portion 3 of the fixed scroll 1, and has a bottom surface 13A and an inner side surface 13B on its tooth tip 11A side.
And a groove 13 having a U-shaped cross section from the outer surface 13C.
Are formed.

Reference numeral 14 denotes another sealing member mounted in the concave groove 13. The sealing member 14 includes the bottom surface 6A, the sliding contact surface 6B, the inner side surface 6C of the sealing member 6 on the fixed scroll 1 side, and the outer surface. Bottom surface 14A substantially similar to side surface 6D, sliding contact surface 1
4B, an inner surface 14C, and an outer surface 14D. In addition, a sealing member 6 is provided on the bottom surface 14A of the sealing member 14.
Similarly, a plurality of bottom lip portions 15, 15,... Are integrally formed, and a plurality of inner lip portions 16, 1,.
Are integrally formed.

Reference numeral 17 denotes a drive shaft rotatably provided on the casing main body. The drive shaft 17 is a crank 17A whose tip end extends into the casing main body, and the axis of the crank 17A is the axis of the drive shaft 17. 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 17A of the drive shaft 17 via a orbiting bearing 18 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.

Here, the wrap portion 11 of the orbiting scroll 9
Is disposed so as to overlap with the wrap portion 3 of the fixed scroll 1 by being shifted by a predetermined angle in the circumferential direction.
As shown in FIG. 6, a plurality of crescent-shaped compression chambers R, R,... When the orbiting scroll 9 is turned with respect to the fixed scroll 1, the volume of each of the compression chambers R is continuously reduced from the outer peripheral side toward the inner peripheral side, and is sucked from a suction port 19 described later. It is designed to compress air.

Reference numerals 19 and 20 denote a suction port and a discharge port formed in the fixed scroll 1. The suction port 19 is formed on the outer peripheral side of the end plate 2 so as to communicate with the outermost low pressure compression chamber R. The discharge port 20 is bored at the center of the end plate 2 so as to communicate with the innermost high-pressure compression chamber R.

In the conventional scroll-type air compressor constructed as described above, first, when the drive shaft 17 is driven to rotate by a drive source (not shown) such as a motor from the outside of the casing, this rotation is performed by the drive shaft. 17 is transmitted to the orbiting scroll 9 via the orbiting bearing 18 from the crank 17A,
The orbiting scroll 9 makes a revolving motion having a revolving radius of a predetermined dimension δ around the axis O1-O1 of the drive shaft 17.

The compression chambers R, R,... Defined between the wrap portions 3, 11 by this swirling motion are continuously reduced toward the inner peripheral side, and the air sucked from the suction port 19 is released. The compressed air is discharged from the discharge port 20 to an external air tank (not shown) or the like while being sequentially compressed.

Here, when the compression operation is started, the compressed air R from the high pressure side compression chamber R in the concave grooves 5, 13 of the wrap portions 3, 11 in the direction of arrow A shown in FIG. Portion enters, and the sealing members 6 and 14 are attached to the bottom surfaces 6A and 1 serving as pressure receiving surfaces.
At 4A, the pressure of the compressed air is received. For this reason, the sealing members 6 and 14 float from the bottom surfaces 5A and 13A of the concave grooves 5 and 13, and the tooth bottom surfaces 2A and 10A of the facing end plates 2 and 10 respectively.
Pressed toward. Thereby, the sealing members 6 and 1
Reference numeral 4 indicates that the sliding contact surfaces 6B and 14B are opposite tooth bottom surfaces 10A and 2B.
A and slidably contact each other to hermetically seal each compression chamber R defined between the wrap portions 3 and 11.

Each of the bottom lip portions 7 (15) extends from the inner compression chamber R to the outer compression chamber R in the direction indicated by the arrow B in FIG. It expands due to the compressed air that has invaded. For this reason, each bottom lip 7 (15)
Is the bottom surface 5A (13A) of the concave groove 5 (13)
And the bottom surface 5A (13A) of the concave groove 5 (13).
And the sealing member 6 (14) is hermetically sealed.

Similarly, each of the inner lip portions 8 (16) is expanded by the compressed air which has entered the concave groove 5 (13). For this reason, the tip side of each inner lip 8 (16) is pressed against one inner surface 5B (13B) of the groove 5 (13), and the inner surface 5B (13B) of the groove 5 (13).
And the sealing member 6 (14) is hermetically sealed, and the outer surface 6D (14D) of the sealing member 6 (14) is pressed against the other outer surface 5C (13C) to hermetically seal the two. Let it.

[0021]

By the way, in the above-mentioned prior art, it is necessary to form a plurality of lips 7, 8 (15, 16) along the length direction of the seal member 6 (14). For this reason, after molding the sealing member 6 (14) from the resin material, the bottom surface 6A (1) of the sealing member 6 (14) is formed.
4A) is cut diagonally at a predetermined interval, and an inner surface 6C (14C) of the seal member 6 (14) is cut diagonally at a predetermined interval. This allows
Each bottom lip 7 (15) is formed on the bottom surface 6A (14A) of the seal member 6 (14), and the inner side surface 6C (14) is formed.
C), each inner lip 8 (16) is formed.

For this reason, in the prior art, the sealing member 6
The post-cutting of (14) requires post-processing, which increases the number of man-hours for manufacturing the seal member 6 (14). Therefore, there is a problem that workability is poor and cost is increased.

The tip of each inner lip 8 (16) is formed very thin because it is expanded by compressed air. Therefore, the sealing member 6 (14) is inserted into the concave groove 5 (13).
When mounted inside, there is a problem that the tip of each inner lip portion 8 (16) comes into contact with the opening end of the concave groove 5 (13) and breakage or other breakage occurs.

Further, in the prior art, the sealing member 6 (1
The lip portions 7, 8 are formed by making cuts in two surfaces of the bottom surface 6A (14A) and the inner side surface 6C (14C) of 4).
(15, 16) are formed. Therefore, when the pressure of the compressed air is received by the lip portions 7, 8 (15, 16), a maximum stress is applied to the base end sides of the lip portions 7, 8 (15, 16), and the sealing member 6 (14) has a problem that it is easily broken and has low reliability.

In order to improve the sealing performance of the lip parts 7, 8 (15, 16), the lip parts 7, 8
(15, 16) needs to be easily expanded. For this reason, it is necessary to form the seal member 6 (14) with a soft resin material, and it is not possible to use a hard material, a resin material having wear resistance at high temperatures, or the like.
4) has a problem that it is easily worn.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a scroll type fluid machine which can eliminate post-processing of a seal member and is excellent in reliability and wear resistance. And

[0027]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a casing, a fixed scroll provided on the casing and having a spiral wrap portion erected on a tooth bottom surface of a head plate, A drive shaft rotatably provided at the distal end thereof and extending into the casing; and a swirl formed on the tooth bottom surface of the end plate facing the fixed scroll and rotatably provided at the distal end of the drive shaft located in the casing. The orbiting scroll in which the wrap portion is erected, and a plurality of compression chambers formed between the orbiting scroll and the fixed scroll and having a low pressure on the outer peripheral side and a high pressure on the inner peripheral side, the orbiting scroll and the fixed scroll At least one of the lap portions has a groove extending along the tooth tip of the lap portion, and a seal portion slidably in contact with the tooth bottom surface of the mating portion in the groove. The applies to a scroll fluid machine comprising wearing.

A feature of the structure adopted by the first aspect of the present invention is that a plurality of fitting holes are provided on the bottom surface of the concave groove so as to be spaced apart in the longitudinal direction of the concave groove, and the bottom surface of the sealing member is provided on the bottom surface of the sealing member. A plurality of projections that fit into the fitting holes are provided at positions facing the fitting holes, and a seal member protruding radially inward at a position corresponding to the projections on the inner surface of the seal member. That is, a projection is provided.

[0029] With this configuration, a plurality of projections provided on the bottom surface of the seal member are fitted into a plurality of fitting holes provided on the bottom surface of the groove, so that the bottom surface of the groove and the bottom surface of the groove are fitted. The flow of the compressed fluid flowing between the high-pressure side compression chamber and the low-pressure side compression chamber through the space between the bottom surface of the seal member can be blocked. In addition, the sealing protrusion provided on the inner surface of the sealing member slides on the inner surface of the concave groove,
The flow of the compressed fluid flowing from the high-pressure side compression chamber to the low-pressure side compression chamber passing between the inner surface of the seal member and the inner surface of the concave groove can be blocked.

According to a second aspect of the present invention, the seal member is constituted by connecting a plurality of seal divided bodies provided with the projections and the seal projections so as to be separable from each other, and the seal divisions adjacent to each other are formed. The space between the bodies is formed to absorb the thermal expansion and contraction of each of the seal divided bodies.

Thus, the flow of the compressed fluid flowing from the high-pressure side compression chamber to the low-pressure side compression chamber can be blocked by the projection of each seal divided body and the sealing projection. In addition, the projections of each of the seal divided bodies are engaged with the fitting holes of the concave groove, whereby each seal divided body can be positioned in the concave groove. Further, the thermal expansion and thermal contraction of each seal divided body can be absorbed by the space formed between the seal divided bodies adjacent to each other.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an air compressor will be described as an example of a scroll fluid machine according to an embodiment of the present invention with reference to FIG.
This will be described in detail with reference to FIG.

FIGS. 1 to 7 show a first embodiment of the present invention. In the present embodiment, the same components as those of the above-described prior art are denoted by the same reference numerals, and the description thereof will be omitted. Omitted.

In the drawing, reference numeral 31 denotes a groove formed on the tooth tip 3A of the wrap portion 3 provided on the fixed scroll 1.
1 is formed at a middle portion in the width direction of the wrap portion 3 so as to have a substantially U-shaped cross section, and the bottom surface 31A, the inner side surface 31B, and the outer side surface 31C follow the spiral shape of the wrap portion 3 It extends from its inner end to its outer end. A seal member 33 to be described later is mounted in the concave groove 31 so as to seal the gap between the counter surface and the tooth bottom surface 10A of the revolving scroll 9.

These points are the same as those of the concave groove 5 according to the prior art, but the bottom 31A of the concave groove 31 according to the present embodiment has a plurality of bottomed and oblong fitting holes 32,
32,... Are different from the concave grooves 5 according to the prior art.

As shown in FIG. 3, the fitting holes 32 are arranged apart from each other in the longitudinal direction of the concave groove 31. Each fitting hole 32 extends over a length L in the longitudinal direction of the groove 31 and has a width substantially equal to the width W1 of the groove 31. For this reason, when the concave groove 31 is formed by cutting using an end mill or the like, each fitting hole 32 is formed simultaneously with the processing of the concave groove 31 by processing the depth dimension deeper than the concave groove 31. Is what is done.

As shown in FIG. 5, the fitting hole 32 has arcuate surfaces 32A, 32A which are arcuate surfaces having a radius r1 at both ends in the length direction, and the radius r1 of the arcuate surface 32A.
Is about half the width W1 of the groove 31. The dimension L of the fitting hole 32 is, for example,
Is approximately twice as large as the width W1.

Reference numeral 33 denotes a seal member mounted in the concave groove 31. The seal member 33 is formed in a long string shape having a rectangular cross section. The seal member 33 has a width W2 as shown in FIG. 4, and extends spirally along the length direction of the concave groove 31.

The sealing member 33 has a bottom surface 33 as a pressure receiving surface, similarly to the sealing member 6 described in the related art.
A and a sliding contact surface 33B that is in sliding contact with the counterpart tooth bottom surface 10A.
And an inner surface 33C and an outer surface 33D,
The reciprocating scroll 9 is mounted in the concave groove 31 so as to be able to float toward the tooth bottom surface 10A of the revolving scroll 9.

A projection 34 described later is provided on the bottom surface 33A of the seal member 33, and a seal extending from the projection 34 to the sliding contact surface 33B of the seal member 33 is formed on the inner surface 33C of the seal member 33. The projections 35 are formed integrally with each other.

The seal member 33 is formed by injection molding. Therefore, the seal member 33 is made of, for example, polytetrafluoroethylene (PTFE) containing carbon fiber or the like as an elastic resin material having excellent wear resistance and slidability.
In addition to fluorine-based resins such as composite materials, as materials having higher rigidity, for example, ethylene tetrafluoride perfluoroalkoxyethylene resin (PFA), polyether sulfone (PE)
S), polyphenylene sulfide (PPS), polyimide (PI) and the like.

Are the bottom surface 3 of the sealing member 33.
3A, each of the protrusions 34 is disposed at a position facing each of the fitting holes 32 of the concave groove 31, and is spaced apart in the length direction of the seal member 33. Has been established. As a result, each protrusion 34 is
Is fitted in the groove 31, the fitting hole 32 of the groove 31 is
And fitted into each fitting hole 32.

The projection 34 has a circular bottom surface 34A as shown in FIG. 4, and its radius r2 is set to a value substantially equal to the radius r1 of the arcuate surface 32A of the concave groove 31. The diameter (2 × r2) of the projection 34 is
The width W1 is set to a value slightly larger than the width W1 and to a value larger than the width W2 of the seal member 33. Further, as shown in FIG. 6, the protrusion 34 has a protrusion dimension H2 set to a value smaller than the depth dimension H1 of the fitting hole 32. Then, the outer peripheral surface 34B of each protrusion 34
Are in surface contact with the arcuate surface 32A of the fitting hole 32 with the seal member 33 mounted in the concave groove 31.

Are projections provided radially inward from the inner side surface 33C of the sealing member 33 at positions corresponding to the projections 34. The sealing projections 35
The seal member 33 has an arcuate surface at its distal end 35A.
Extending upward and downward, and from the bottom surface 34 </ b> A of the protrusion 34 of the seal member 33, the sliding contact surface 3 of the seal member 33.
It is formed continuously over 3B. For this reason, FIG.
As shown in the figure, the width W3 of the portion where the sealing projection 35 is provided in the width of the sealing member 33 is substantially equal to the diameter (2.times.r2) of the projection 34.

Then, the tip 35A of the sealing projection 35 is formed.
When the seal member 33 is mounted in the concave groove 31, the sliding member comes into sliding contact with the inner surface 31B of the concave groove 31. Thereby, the seal member 33 is pressed against the outer surface 31 </ b> C side of the concave groove 31. Further, between the sealing projections 35, the inner surface 31B of the concave groove 31 and the inner surface 33C of the sealing member 33 are separated from each other. Thereby, between the sealing projections 35, the inner surface 31B of the concave groove 31 and the inner surface 33C of the sealing member 33 are provided.
Thus, a space S is formed.

The projections 34 and the sealing projections 3 described above are also provided in the grooves 13 of the wrap 11 of the orbiting scroll 9.
The seal member similar to the seal member 33 having the seal member 5 is attached.
The description is omitted here.

The scroll-type air compressor according to the present embodiment has the above-described configuration, and there is no particular difference in the basic compression operation from that of the prior art.

In this embodiment, however, the sealing member 3
3, a protrusion 34 is formed on the bottom surface 33A, and a sliding contact surface 33B of the seal member 33 is formed from the bottom surface 34A of the protrusion 34.
, A sealing projection 35 is formed, and the projection 34 is inserted into the fitting hole 32 of the concave groove 31. For this reason, the following effects can be obtained.

That is, when the operation of the scroll type air compressor is started to compress the air in each compression chamber R, the space between the inner surface 33C of the seal member 33 and the inner surface 31B of the groove 31 is formed. Part of the compressed air enters S in the direction indicated by the arrow C in FIGS. Then, the compressed air that has entered the concave groove 31 flows in the direction indicated by the arrow D in FIG. That is, the compressed air is supplied to the bottom surface 33A of the seal member 33 and the concave groove 3A.
1, and flows along the groove 31 from the compression chamber R on the high pressure side to the compression chamber R on the low pressure side, and enters the fitting hole 32 of the groove 31.

At this time, the compressed air which has entered the fitting hole 32 of the concave groove 31 flows into the fitting hole 32, and its flow is distributed by the projection 34 in surface contact with the arcuate surface 32 A of the fitting hole 32. Will be shut off. Thereby, the bottom surface 34A of the protrusion 34
Receives the pressure of the compressed air, and floats the seal member 33 from the inside of the concave groove 31 toward the mating tooth bottom surface 10A. As a result, the sealing member 33 is
3B is in sliding contact with the other tooth bottom surface 10A to seal between the compression chambers R, and the compressed air flows between the wrap portion 3 and the tooth bottom surface 10A.
A prevents the compressed air from leaking from the area A.

The compressed air which has entered the space S between the inner surface 33C of the seal member 33 and the inner surface 31B of the concave groove 31 flows from the high pressure side compression chamber R along the inner surface 31B of the concave groove 31. It flows toward the compression chamber R on the low pressure side. At this time,
Sealing projection 3 provided on inner surface 33C of sealing member 33
Since the distal end 35A of the fifth member 5 is in sliding contact with the inner surface 31B of the concave groove 31, the flow of the compressed air can be shut off by the sealing projection 35. Thereby, the leakage of the compressed air can be prevented, and the compression efficiency can be improved.

Here, the seal member 3 according to the present embodiment is used.
Table 1 shows the measurement results of the discharge air amount and discharge pressure when the seal member 3 and the sealing member 6 according to the prior art were used, respectively. However, the measurement results shown in Table 1 indicate that each seal member 3
The scroll-type air compressors 3 and 6 were mounted for 5000 hours of operation. As shown in Table 1, when the seal member 33 according to the present embodiment is used, the discharged air amount is larger and the discharged air pressure is higher than when the conventional seal member 6 is used. Become
It was confirmed that the compression efficiency was high.

[0053]

[Table 1]

Further, since the fitting hole 32 of the concave groove 31 is formed in an elliptical shape and the projection 34 of the seal member 33 is formed in a circular shape, the projection 34 can be easily mounted when the seal member 33 is mounted in the groove 31. Can be inserted into the fitting hole 32.

Further, when the inside of the high-pressure side compression chamber R becomes high temperature with the operation of the scroll type air compressor, the seal member 33, the wrap portion 3 and the like thermally expand. At this time, the sealing member 33 made of a resin material or the like has a larger coefficient of thermal expansion than the wrap portion 3 made of a metal material or the like. The distance between the portions 34 also increases.

For example, when the protrusion 34 cannot be displaced in the length direction in the fitting hole 32, the seal member 33 is moved from the concave groove 31 to the mating tooth bottom surface 10A by thermal expansion of the seal member 33. Therefore, the seal member 33 tends to be worn out. But,
In the present embodiment, the fitting hole 32 has an elliptical shape, and the projection 34 can be displaced in the length direction in the fitting hole 32. Therefore, the fitting hole 32 absorbs the thermal expansion of the seal member 33. can do. Thereby, the deformation of the seal member 33 can be prevented, and the durability of the seal member 33 can be improved.

On the other hand, the projection 3 provided on the seal member 33
4. Since the sealing projection 35 is formed integrally when the sealing member 33 is formed, it is not necessary to perform a special post-processing unlike the conventional lip portion. For this reason, the sealing member 3
3 can be improved in workability.

Also, the tip 35A of each sealing projection 35 is formed.
Has an arcuate surface, it is possible to prevent the distal end portion 35A from contacting the open end of the concave groove 31 when being mounted in the concave groove 31, and to prevent breakage. Further, since no cut or the like is provided in the seal member 33, the seal member 33 is not broken unlike the seal member according to the related art, and the reliability of the seal member 33 can be improved.

Thus, according to the present embodiment, the projection 34 and the sealing projection 35 are formed on the seal member 33, and the projection 34 is fitted into the fitting hole 32 of the concave groove 31. Therefore, the flow of the compressed air flowing in the longitudinal direction of the concave groove 31 passing between the bottom surface 33A of the seal member 33 and the bottom surface 31A of the concave groove 31 is blocked by the projection 34 inserted into the fitting hole 32. can do.

Further, the sealing member 33 is brought into contact with the inner surface 31B of the groove 31 by the sealing projection 35.
And the space S can be formed between the inner surface 33C of the seal member 33 and the inner surface 31B of the concave groove 31. This allows compressed air to enter the fitting hole 32 through the space S, and allows the seal member 33 to float toward the mating tooth bottom surface 10A by the compressed air entering the fitting hole 32. . For this reason, the space between the compression chambers R can be reliably sealed by the seal member 33.

Further, the groove 31 is formed by the sealing projection 35.
The flow of the compressed air flowing along the inner side surface 31B can be blocked. Thereby, it is possible to prevent the compressed air from leaking through the concave groove 31, and it is possible to improve the compression efficiency of the scroll air compressor.

Further, the projection 3 provided on the seal member 33
4. Since the sealing projection 35 has a simple shape and is integrally formed when the sealing member 33 is formed, it is not necessary to perform a special post-processing unlike the conventional lip portion. For this reason, workability at the time of manufacturing the seal member 33 can be improved. Further, since it is not necessary to provide a cut or the like in the seal member 33 unlike the seal member according to the related art,
The reliability of the seal member 33 can be improved. Since a material having relatively high rigidity can be used for the seal member 33, the wear resistance of the seal member 33 can be improved.

In the first embodiment, the projection 34 has been described as projecting from the bottom surface 33A of the sealing member 33 in a cylindrical shape. However, the present invention is not limited to this, and the first embodiment shown in FIG. The protrusion 34 'formed in the shape of a semicircular column as in the modification of (1) may be used. At this time, although the sealing projection 35 'also has a shape in which half of the arc surface is notched, the tip 3
The point at which 5A 'slides on the inner surface 31A of the groove 31 is the same as that of the sealing projection 35 according to the first embodiment.

Further, as in a second modification shown in FIG. 9, a substantially circular notch 36 may be provided from the columnar projection 34 "to the entire upper and lower parts of the sealing member 33". . At this time, the sealing projection 35 ″ also has a substantially circular cutout shape, but the distal end 35A ″ has the concave groove 3A.
The point of sliding contact with the inner surface 31 </ b> B is the same as that of the sealing projection 35 according to the first embodiment.

Next, FIGS. 10 to 14 show the second embodiment of the present invention.
This embodiment is characterized in that the seal member is constituted by a plurality of seal divided bodies. In the present embodiment, the same components as those in the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 41 denotes a groove formed on the tooth tip 3A of the wrap portion 3 provided on the fixed scroll 1, and the groove 41 is formed on the wrap portion 3 in the same manner as the groove 5 according to the prior art. The bottom surface 41A, the inner side surface 41B, and the outer side surface 41C are formed at a middle portion in the width direction so as to have a substantially U-shaped cross section. Extending to

Are the bottom surfaces 41A of the concave grooves 41.
Each of the fitting holes 42 is formed in a bottomed and circular shape, and the fitting holes 42 are separated from each other in the longitudinal direction of the concave groove 41 as shown in FIG. It is arranged. Each fitting hole 42 has substantially the same size as the width W4 of the concave groove 41 shown in FIG. The fitting hole 42 is formed in a circular shape with a radius r3 as shown in FIG. 13, and the radius r3 is approximately half the width W4 of the concave groove 41.

Reference numerals 43, 43,... Denote seal divisions mounted in the grooves 41. The seal divisions 43 have a width W5 as shown in FIG. It is formed in a long string shape. Then, these seal divided bodies 43 are connected to each other and mounted in the concave groove 41,
The sealing member extends spirally along the longitudinal direction of the concave groove 41.

The seal divided body 43 has a bottom surface 43 as a pressure receiving surface, similarly to the seal member 6 described in the related art.
A and a sliding contact surface 43B that is in sliding contact with the other tooth bottom surface 10A.
And an inner side surface 43C and an outer side surface 43D,
The reciprocating scroll 9 is mounted in the concave groove 41 so as to be able to float toward the tooth bottom surface 10A of the revolving scroll 9.

Then, the base end side 43E of the seal divided body 43
On the bottom surface 43A side, a projection 44 described later is provided, and on the inner side surface 43C side, a sealing projection 45 extending from the projection 44 to the sliding contact surface 43B of the seal divided body 43 is provided. . In addition, the base end side 43 of the seal divided body 43
E is provided with a notch portion 46 in which the outer surface 43D side is cut out on the sliding contact surface 43B side. Further, the seal divided body 43
A connecting step portion 47 protruding in the length direction of the seal divided body 43 is provided on the front end side 43F of the sealing member 43.

The seal divided body 43 is made of an elastic resin material having excellent abrasion resistance and slidability, for example, a fluorine-based resin such as polytetrafluoroethylene (PTFE), polyether sulfone (PES), polyphenylene sulfide. (PPS), polyetheretherketone (PE
EK), liquid crystal polymer (LCP), polysulfone (P
SF) or the like.

Reference numerals 44, 44,... Denote projections formed on the base end side 43E of each seal divided body 43, respectively.
Reference numeral 4 is provided to project in a columnar shape from the bottom surface 43A of the seal divided body 43.

The projection 44 has a columnar shape with a radius r4 substantially equal to the radius r3 of the fitting hole 42, as shown in FIG. The diameter of the projection 44 (2 × r4
) Is slightly larger than the width W4 of the groove 41 shown in FIG.
It is set to a value greater than 5. Also, the protrusion 44
As shown in FIG. 14, the protrusion dimension H4 is
Is set to a value smaller than the depth dimension H3. Then, each of the protrusions 44 is inserted into the fitting hole 42 of the concave groove 41 so as to be displaceable upward and downward in a state where the seal divided body 43 is mounted in the concave groove 41. Face to face.

Reference numerals 45, 45,... Denote sealing projections provided on the base end side 43E of each of the seal divided bodies 43. Each of the sealing projections 45 is located at a position corresponding to the projection 44 at the inner side surface 43C.
And is provided so as to protrude radially inward from the center. The tip 45A of the sealing projection 45 has an arcuate surface,
While extending toward the upper and lower directions of the seal divided body 43,
The seal divided body 43 is formed continuously from the bottom surface 44A of the projection 44 to the sliding contact surface 43B of the seal divided body 43. For this reason, the width dimension W6 of the portion where the sealing projection 45 is provided in the width dimension of the seal divided body 43 is determined as shown in FIG.
As shown in the figure, the diameter is substantially equal to the diameter (2 × r4) of the projection 44.

Then, the tip portion 45A of the sealing projection 45 is formed.
When the seal divided body 43 is mounted in the concave groove 41,
It comes into sliding contact with the inner side surface 41B of the concave groove 41. Thereby, the seal divided body 43 is pressed against the outer surface 41 </ b> C side of the concave groove 41. Further, between the sealing protrusions 45, the inner surface 41B of the concave groove 41 and the inner surface 43C of the seal divided body 43 are separated from each other. Thereby, a space S is defined between the sealing projections 45 by the inner surface 41B of the concave groove 41 and the inner surface 43C of the seal divided body 43.

Are cutouts formed by cutting out the outer surface 43D at the base end side 43E of each seal split 43, and the cutout 46 has a width dimension W7.
Is attached to the groove 41, the outer surface 41 of the groove 41
A substantially prismatic space is formed between C and C.

Are connecting steps provided on the distal end side 43E of each seal split 43. The connecting step 47 has a substantially angled outer surface 43D of each seal split 43 in the longitudinal direction. It protrudes in a columnar shape. Each connecting step 47 has a width substantially equal to the width W7 of the notch 46 shown in FIG. It comes into contact with the notch 46 of the divided body 43. Therefore, each connecting step 47 and each notch 46 overlap each other over a dimension L1 in the longitudinal direction of the concave groove 41 as shown in FIG. When the connecting step 47 is inserted into the notch 46, the width of the sealing projection 45 and the connecting step 47 is equal to the width W4 of the groove 41.
The width dimension is almost equal to

, 48, 48,...
The space 48 is formed between the notch 46 of one seal split 43 and the other seal split 4.
3 and has a dimension L2 in the longitudinal direction of the concave groove 41. Thereby, the space 4
Numeral 8 absorbs the thermal expansion and contraction of the seal divided body 43 when the seal divided body 43 thermally expands and contracts.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those of the first embodiment can be obtained. In the present embodiment, in particular, in the present embodiment, the seal member is divided into a plurality of seals. It is constituted by a body 43. Therefore, the protrusion 44 inserted into the fitting hole 42 of the concave groove 41
The flow of the compressed air flowing on the bottom surface 41A side of the concave groove 41 can be shut off, and the sealing protrusion 45 slidingly contacting the inner surface 41B of the concave groove 41 circulates on the inner surface 41B side of the concave groove 41. The flow of the compressed air can be shut off. Thereby, it is possible to prevent the compressed air from leaking through the inside of the concave groove 41.

Further, the connecting step 47 of the other seal divided body 43 is brought into contact with the notch 46 of the seal divided body 43,
6 and the connecting step 47 are overlapped in the lengthwise direction over the dimension L1, so that it is possible to prevent the compressed air from leaking radially outward between the seal splits 43.

Further, when the inside of the high-pressure side compression chamber R is brought to a high temperature state with the operation of the scroll type air compressor, the seal divided body 43, the wrap portion 3 and the like thermally expand. At this time, the seal divided body 43 made of a resin material or the like has a larger coefficient of thermal expansion than the wrap portion 3 made of a metal material or the like.

However, in the present embodiment, since the space 48 is formed between the seal divided bodies 43, the space 48 can absorb the thermal expansion of the seal divided body 43. Thereby, the deformation of the seal divided body 43 can be prevented, and the durability of the seal divided body 43 can be improved. Further, even when thermal expansion or the like occurs in the seal divided body 43,
The projection 44 can be held in a state of being inserted into the fitting hole 42. For this reason, even when thermal expansion or the like occurs in the seal divided body 43, it is possible to reliably prevent the compressed air from leaking through the concave groove 41, and it is possible to further increase the compression efficiency.

In the second embodiment, it is not necessary to form all the seal divided bodies 43 with the same material.
For example, the seal divided body 43 in the vicinity of the discharge port 20, which is in a high temperature state, can be formed of a material having higher heat resistance.

In the second embodiment, the grooves 4
Although one fitting hole 42 is formed in a circular shape, it may be formed in an elliptical shape like the fitting hole 32 according to the first embodiment. Further, the fitting holes 32 and 42 according to each embodiment may have other shapes as long as the fitting holes 32 and 42 have a circular arc surface portion 32A like the fitting hole 32.

In the second embodiment, the projections 44 are formed in a columnar shape.
The shape may be a semicircular columnar shape as in the modification of the above, or a shape provided with a circular notch as in the second modification as shown in FIG.

In each of the above-described embodiments, the seal member 33 and the seal divided body 43 are mounted in the concave grooves 31 and 41 on the fixed scroll 1 side, and the same seal member is mounted on the wrap portion on the orbiting scroll 9 side. However, the present invention is not limited to this. For example, a concave groove is formed in one of the wrap portions on the fixed scroll 1 side or the orbiting scroll 9 side, and a seal member is mounted in the concave groove. It is good also as a structure which performs.

Further, in each of the above embodiments, the scroll type fluid machine has been described by taking the scroll type air compressor as an example, but it can be widely applied to, for example, a vacuum pump, a refrigerant compressor and the like.

[0088]

As described above in detail, according to the first aspect of the present invention, a projection and a sealing projection are formed on the seal member, and the projection is fitted into the fitting hole of the concave groove. . For this reason, the flow of the compressed air flowing between the bottom surface of the sealing member and the bottom surface of the concave groove and flowing in the longitudinal direction of the concave groove can be blocked by the protrusion inserted into the fitting hole.

Further, the flow of the compressed air flowing along the inner surface of the groove can be blocked by the sealing projection. Thereby, it is possible to prevent the compressed air from leaking through the concave groove, and it is possible to improve the compression efficiency of the scroll air compressor.

Further, since the projections and sealing projections provided on the seal member have simple shapes and are integrally formed at the time of molding the seal member, special post-processing is performed as in the conventional lip portion. No need. For this reason, workability at the time of manufacturing the seal member can be improved. Moreover, since it is not necessary to provide a cut or the like in the seal member as in the seal member according to the related art, the reliability of the seal member can be improved. In addition, since a relatively rigid material can be used for the seal member, the wear resistance of the seal member can be improved.

According to the second aspect of the present invention, the seal member is constituted by a plurality of seal divided bodies and a space is formed between the adjacent seal divided bodies. It can absorb thermal expansion and thermal shrinkage. Thereby, the deformation of the seal divided body can be prevented, and the durability of the seal divided body can be improved.

Further, even when thermal expansion or the like occurs in the seal divided body, the projection can be held in a state of being inserted into the fitting hole. For this reason, even when thermal expansion or the like occurs in the seal divided body, it is possible to reliably prevent the compressed air from leaking through the concave groove, and it is possible to further increase the compression efficiency.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a wrap portion and a seal member of a scroll-type air compressor according to a first embodiment of the present invention in an exploded manner.

FIG. 2 is an enlarged perspective view of a main part showing a state in which a seal member according to the first embodiment is mounted on a wrap portion.

FIG. 3 is an enlarged perspective view of a main part showing a concave groove and a fitting hole of a wrap portion according to the first embodiment.

FIG. 4 is an enlarged perspective view of a main part of the seal member according to the first embodiment as viewed from a bottom surface side.

FIG. 5 is an enlarged plan view of a main part showing a seal member and a wrap portion according to the first embodiment.

6 is a seal member viewed from a direction indicated by arrows VI-VI in FIG. 5,
It is sectional drawing which shows a wrap part etc.

FIG. 7 is a cross-sectional view showing a seal member, a wrap portion, and the like as viewed from the direction of arrows VII-VII in FIG.

FIG. 8 is an enlarged perspective view of a main part of a seal member according to a first modification, viewed from a position similar to FIG.

FIG. 9 is an enlarged perspective view of a main part of a seal member according to a second modified example, viewed from a position similar to FIG.

FIG. 10 is an exploded perspective view showing an exploded lap portion and a seal split body of a scroll-type air compressor according to a second embodiment of the present invention.

FIG. 11 is an enlarged perspective view of a main part showing a state in which the seal divided body according to the second embodiment is mounted on a wrap portion.

FIG. 12 is an enlarged perspective view of a main part showing a concave groove and a fitting hole of a wrap portion according to a second embodiment.

FIG. 13 is an enlarged plan view of a main part showing a seal divided body and a wrap portion according to a second embodiment.

14 is a cross-sectional view showing a seal divided body, a wrap portion, and the like, as viewed from the direction of arrows XIV-XIV in FIG.

FIG. 15 is a longitudinal sectional view showing a fixed scroll, an orbiting scroll, a seal member, and the like of a scroll-type air compressor according to the related art.

FIG. 16 is an enlarged cross-sectional view as viewed from the direction indicated by arrows XVI-XVI in FIG. 15;

FIG. 17 is an enlarged cross-sectional view as seen from the direction of arrows XVII-XVII in FIG. 16;

FIG. 18 is an enlarged perspective view showing a conventional sealing member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed scroll 2,10 End plate 2A, 10A Tooth bottom surface 3,11 Lapping part 9 Orbiting scroll 31,41 Depression groove 32,42 Fitting hole 33 Seal member 34,44 Projection 35,45 Seal projection 43 Seal division body 48 space

Claims (2)

[Claims] 1. A casing, a fixed scroll provided on the casing and having a spiral wrap portion erected on a tooth bottom surface of a head plate, and a drive shaft rotatably provided on the casing and having a tip end extending into the casing. A orbiting scroll which is provided in the casing and is rotatably provided at a tip end side of the drive shaft, and a spiral wrap portion is provided upright on a tooth bottom surface of the head plate facing the fixed scroll; and A plurality of compression chambers formed between the fixed scroll and the outer peripheral side at a low pressure and the inner peripheral side at a high pressure. A scroll type fluid machine comprising a concave groove extending along the tooth tip of A plurality of fitting holes are provided on the bottom surface of the sealing member so as to be spaced apart from each other in the length direction of the concave groove. A scroll-type fluid machine, wherein a seal protrusion protruding radially inward is provided at a position corresponding to the protrusion on the inner surface of the seal member. 2. The seal member is constituted by connecting a plurality of seal divided bodies provided with the protrusions and the seal protrusions so as to be separable from each other, and each of the seal divided bodies is disposed between adjacent seal divided bodies. The scroll type fluid machine according to claim 1, wherein a space portion for absorbing thermal expansion and thermal contraction of the seal divided body is formed.