JPH07174094A - Scroll type fluid machinery - Google Patents

Abstract

PURPOSE:To surely float up a sealing member toward the tooth land of the opponent and improve the sealing performance of a sealing member. CONSTITUTION:Each saw-toothed stage part 22 is formed on the bottom surface of a recessed groove 21 formed on the tooth crest 3A of a lap part 3, and on a sealing member 23 inserted into the recessed groove 21, each saw-toothed stage part 24 which is engaged with each saw-toothed stage part 22 of the recessed groove 21 is formed, on the lower side surface opposed to the bottom surface of the recessed groove 21, and a plurality of pressure spaces R are the recessed groove 21, and a plurality of pressure spaces R are formed between each saw-toothed stage part 22 of the recessed groove 21 and each saw-toothed stage part 24 of the sealing member 23. When the compressed air flows and each pressure space R is put into a high pressure, the sealing member 23 floats up toward the bottom land 8A of the opponent, and the sealing surface 23A of the sealing member 23 makes slide contact with the tooth land 8A of the opponent.

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.

[0002]

2. Description of the Related Art A scroll type air compressor will be described as an example of a scroll type fluid machine according to the prior art, and will be described with reference to FIGS.

In the figure, reference numeral 1 denotes a fixed scroll, and the fixed scroll 1 has an open end of a casing (not shown) formed in a generally cylindrical shape with a bottom so that the open end of the casing is covered. It is fixed to the side. The center of the fixed scroll 1 is the axis O1 of the drive shaft 13, which will be described later.
A disk-shaped fixed end plate 2 arranged so as to coincide with O1, a spiral wrap portion 3 standing on the tooth bottom surface 2A of the end plate 2, and a position on the outer peripheral side of the end plate 2 However, it is generally constituted by a supporting portion 4 formed in a tubular shape so as to surround the wrap portion 3.

Further, the tooth top surface 3A of the wrap portion 3 has
A concave groove 5 having a U-shaped cross-section that opens toward a tooth bottom surface 8A of an end plate 8 of an orbiting scroll 7 described later is formed.
Extends spirally along the length direction of the wrap portion 3. Then, a seal member 6 described later is inserted into the groove 5.

Reference numeral 6 denotes a seal member inserted into the concave groove 5 of the wrap portion 3. The seal member 6 is made of a resin material having a self-lubricating property such as polytetrafluoroethylene (PTFE) and carbon resin. It is formed in a quadrangular cross section and extends spirally along the length direction of the groove 5.
The upper surface of the sealing member 6 facing the tooth bottom surface 8A of the end plate 8 is a sealing surface 6A. Further, the seal member 6 is inserted in the concave groove 5 in a loosely fitted state so that it can be moved upward, downward, left, right and the like in the concave groove 5.

During the compression operation, when the compressed air in the compression chamber 15 which will be described later enters the groove 5 from the direction of arrow A in FIG.
It floats in the concave groove 5 so as to be in sliding contact with the tooth bottom surface 8A of the mirror plate 8 and hermetically seals between the tooth bottom surface 8A of the mirror plate 8 and the lap portion 3.

Reference numeral 7 denotes an orbiting scroll which is provided so as to be able to orbit in the casing so as to face the fixed scroll 1, and the orbiting scroll 7 is a disk-shaped end plate which is formed in a disc shape whose surface side is a tooth bottom surface 8A. 8 and the tooth bottom surface 8A of the end plate 8
To the end plate 2 of the fixed scroll 1, and a spiral wrap portion 9 formed in the same manner as the wrap portion 3 of the fixed scroll 1, and a boss portion 10 provided at the center of the back side of the end plate 8. The boss portion 10 is rotatably attached to a crank 13A of a drive shaft 13 described later.

Further, the tooth top surface 9A of the lap portion 9 has
Similar to the wrap portion 3 of the fixed scroll 1, the concave groove 1 having a U-shaped cross section that extends spirally along the length direction of the wrap portion 9.
1 is provided. A seal member 12 similar to the seal member 6 described above is loosely fitted in the groove 11.

During the compression operation, the compression chamber 15
When the compressed air therein enters the concave groove 11, the seal member 12 floats so as to be in sliding contact with the tooth bottom surface 2A of the end plate 2 of the fixed scroll 1, and the gap between the tooth bottom surface 2A of the end plate 2 and the wrap portion 9 is reached. It is an airtight seal.

Reference numeral 13 denotes a drive shaft rotatably provided in the casing. The drive shaft 13 is a crank 13A having a tip end side extending into the casing. The crank 13A has its axis O2-O2 which is the axis O1-of the drive shaft 13. It is eccentric by a predetermined dimension δ with respect to O1. Then, the crank 13A of the drive shaft 13 rotatably supports the boss portion 10 of the orbiting scroll 7 via the orbiting bearing 14, and causes the orbiting scroll 7 to orbit through the rotation preventing mechanism (not shown) or the like. To give.

Here, in the fixed scroll 1 and the orbiting scroll 7, the wrap portion 9 of the orbiting scroll 7 is the wrap of the fixed scroll 1 with the axis O2-O2 eccentric with respect to the axis O1-O1 by the dimension δ. It is arranged so as to be superposed on the portion 3 while being offset by a predetermined angle in the circumferential direction.
As a result, when the orbiting scroll 7 is orbited with respect to the fixed scroll 1, a plurality of crescent-shaped compression chambers 15 and 1 are continuously reduced in volume between the wrap portions 3 and 9.
5, ... are to be defined.

Reference numerals 16 and 17 denote a suction port and a discharge port formed in the fixed scroll 1. The suction port 16 is bored on the outer peripheral side of the end plate 2 so as to communicate with the compression chamber 15 on the outermost peripheral side, and discharge is performed. The port 17 is formed in the center of the end plate 2 so as to communicate with the innermost compression chamber 15.

The scroll type air compressor according to the prior art has the above-mentioned structure, and its operation will be described below.

First, when the drive shaft 13 is rotationally driven by a drive source (not shown) such as a motor from the outside of the casing, this rotation is transmitted from the crank 13A of the drive shaft 13 to the orbiting scroll 7 via the orbiting bearing 14. Thus, the orbiting scroll 7 makes an orbiting motion with an orbiting radius of dimension δ about the axis O1 -O1 of the drive shaft 13.

The compression chambers 15, 15, ... Defined between the lap portions 3, 9 by this swiveling motion are continuously reduced toward the center side, and the air sucked from the suction port 16 is sequentially compressed. While compressed, this compressed air is discharged from the discharge port 17
From an external air tank (not shown) or the like.

During this compression operation, the compressed air in the compression chamber 15 on the high pressure side enters the concave grooves 5 and 11,
The pressure of the compressed air presses the seal members 6, 12 toward the tooth bottom surfaces 8A, 2A of the facing end plates 8, 2. As a result, the seal members 6 and 12 move toward the tooth bottom surfaces 8A and 2A and come into sliding contact with the tooth bottom surfaces 8A and 2A, and the wrap portion 3
Each compression chamber 15 defined between 9 is hermetically sealed.

[0017]

By the way, in the above-mentioned prior art, the seal members 6 and 12 inserted into the recessed grooves 5 and 11 of the wrap portions 3 and 9 are provided with the pressure of the compressed air from each compression chamber 15. Therefore, the sealing action is merely obtained by sliding the surface of the mating face to the tooth bottom surfaces 8A and 2A of the other side.
In some cases, it may not be possible to reliably seal between the tooth bottom surfaces 8A and 2A and the wrap portions 3 and 9, and the sealing performance cannot always be improved.

That is, when the seal members 6 and 12 float to the tooth bottom surfaces 8A and 2A of the other party to some extent, the concave grooves 5 and 1 are formed.
A gap S is formed between the bottom surface of 1 and the seal members 6 and 12, and the gap S communicates in the concave grooves 5 and 11 from the center side of the wrap portions 3 and 9 toward the outer peripheral side. . For this reason, compressed air from each compression chamber 15 on the innermost peripheral side is separated by the gap S.
May leak toward the low-pressure side compression chamber 15 located on the outer peripheral side. Thereby, the seal member 6,
There is a case where 12 does not float so as to surely come into sliding contact with the tooth bottom surfaces 8A, 2A of the other party, and it is difficult to obtain stable sealing performance.

Further, there is a problem that the compression efficiency is significantly reduced due to the leakage of the compressed air through the gap S.

Therefore, in order to solve the above-mentioned problems, scroll compressors described in Japanese Utility Model Laid-Open No. 2-147887, Japanese Utility Model Laid-Open No. 2-147888 and Japanese Patent Laid-Open No. 3-11101 (hereinafter referred to as other prior arts). ), A plurality of thin lip-shaped projections are integrally formed on the seal member, and the lip-shaped projections are elastically deformed by compressed air during the compression operation, so that the innermost peripheral side to the outer peripheral side of the lap portion are inserted into the concave groove. The gap formed continuously over the course of time is blocked to improve the sealing property.

However, in such another conventional technique, unless high-pressure compressed air acts on the lip-shaped projection of the seal member, the lip-shaped projection is not elastically deformed. For this reason, when the compressed air in each compression chamber 15 is not compressed to a sufficiently high pressure, for example immediately after the start of the compression operation, the lip-shaped projections do not elastically deform, and the sealing action cannot be obtained. There is a problem.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a scroll type fluid machine in which the sealing member can be reliably floated toward the tooth bottom surface of the other party to improve the sealing performance of the sealing member. It is intended to be provided.

[0023]

In order to solve the above-mentioned problems, a scroll type fluid machine according to the present invention comprises a fixed scroll in which a spiral wrap portion is erected from a tooth bottom surface of a fixed side end plate, and the fixed scroll. A revolving scroll which is provided so as to face the scroll, and a spiral wrap portion is erected from the tooth bottom surface of the revolving-side end plate so as to define a plurality of compression chambers with the wrap portion of the fixed scroll. At least one of the wrap portions of the fixed scroll and the orbiting scroll is provided with a groove extending along the tooth top surface of the wrap portion, and the groove is slid on the tooth bottom surface of the other side. It employs a configuration in which a sealing member that comes into contact is mounted.

The features of the configuration adopted by the present invention are as follows.
A serrated step is provided on the bottom side of the groove, and another serrated step that engages with the serrated step is formed on the seal member to seal the serrated step on the groove side. The pressure space is formed when the compressed fluid flows in between the member and the serrated step.

[0025]

With the above configuration, for example, the compression operation is started,
When the pressure in each compression chamber begins to rise, the compressed fluid in each compression chamber on the high pressure side enters the groove and flows between the serrated step on the groove side and the serrated step on the seal member side. To do. As a result, the seal member floats toward the tooth bottom surface of the other side, and a pressure space is formed between the serrated step portion on the concave groove side and the serrated step portion on the seal member side. Furthermore, when compressed air flows into the pressure space, the pressure inside the pressure space becomes high, and the pressure in the pressure space allows the seal member to be surely brought into sliding contact with the tooth bottom surface of the other side, and the wrap portion It is possible to hermetically seal between the tooth bottom surface of the other party.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 7, taking as an example a case where a seal member is mounted in a concave groove on the fixed scroll side. In the embodiment, the same components as those of the conventional technique shown in FIGS. 8 to 10 are designated by the same reference numerals and the description thereof will be omitted.

First, FIGS. 1 to 5 show a first embodiment of the present invention.

In the figure, reference numeral 21 denotes a groove formed on the tooth top surface 3A of the wrap portion 3 according to the present embodiment. The groove 21 is substantially the same as the groove 5 according to the prior art, and is the end plate of the orbiting scroll 7. 8 is formed in a U-shaped cross section and opens toward the tooth bottom surface 8 </ b> A, and extends spirally along the length direction of the wrap portion 3.

However, as shown in FIG. 2, a plurality of saw-toothed step portions 22, 2 are continuously formed in the longitudinal direction on the bottom surface of the concave groove 21.
2, ... Are integrally formed of the same material as the wrap portion 3 of the fixed scroll 1. That is, each sawtooth step 22
Is a rising surface 22A extending substantially vertically upward from the bottom surface of the concave groove 21 toward the mating tooth bottom surface 8A side, and an inclined surface 22 that is gradually inclined downward from the upper end side of the rising surface 22A.
And B are formed in a sawtooth shape in a vertical cross section. Further, the rising surface 22A of each serrated step portion 22 faces the high pressure side (right side in FIG. 2) near the winding start end side of the wrap portion 3, and the inclined surface 22
B is formed so as to face the low pressure side (left side in FIG. 2) close to the winding end end side of the wrap portion 3.

Reference numeral 23 denotes a seal member inserted into the concave groove 21, and the seal member 23 is formed in a substantially rectangular cross section and is substantially the same as the seal member 6 according to the prior art.
1 extends spirally along the length direction. And
The seal member 23 has a seal surface 23A on the upper side surface facing the tooth bottom surface 8A of the end plate 8.

However, as shown in FIG. 2, the lower surface of the seal member 23 according to the present embodiment has saw teeth as a plurality of other saw tooth steps that engage with the respective saw tooth steps 22 of the concave groove 21. The step portions 24, 24, ... Are continuously formed in the length direction of the seal member 23. That is, each sawtooth step 24
Is a cut surface 24A cut substantially perpendicularly to the longitudinal direction of the seal member 23 so as to be in sliding contact with the rising surface 22A of each serrated step 22, and the inclined surface of each serrated step 22 facing each other. 22B and an inclined surface 24B that is inclined substantially parallel to each other and is formed in a sawtooth shape in a vertical cross section.

Here, during the compression operation, the compressed air in the compression chamber 15 on the high pressure side penetrates into the concave groove 21 and opposes the sawtooth step portions 24 of the seal member 23.
4, and the sealing member 23 is directed toward the mating tooth bottom surface 8A by this pressure.
As shown in FIG. 5, when levitated, the inclined surface 22 of each sawtooth step portion 22 faces the inclined surface 24B of each sawtooth step portion 24.
B is separated from each other, and a plurality of pressure spaces R, R,
... is formed.

The scroll type air compressor according to the present embodiment has the above-mentioned structure, and its basic operation is not different from that of the prior art.

However, in this embodiment, each saw-toothed step portion 22 is provided on the bottom side of the concave groove 21, and the seal member 23 inserted into the concave groove 21 has a lower surface facing the bottom surface of the concave groove 21. On the side,
Each serrated step 2 that engages with each serrated step 22 of the groove 21
4 is formed and a plurality of pressure spaces R are formed between the sawtooth step portions 22 of the concave groove 21 and the sawtooth step portions 24 of the seal member 23. Produce an effect.

That is, since the interior of each compression chamber 15 is in a state of substantially atmospheric pressure when the compression operation is stopped, the seal member 23 is shown in FIG.
As shown in FIG. 3, the sawtoothed stepped portion 24 of the seal member 23 is in a state of being sunk to the bottom side in the concave groove 21 and facing the concave groove 2.
One of the serrated steps 22 is engaged.

Next, the compression operation is started, and each compression chamber 15
When the air is gradually compressed inside, the compressed air in the compression chamber 15 on the high pressure side enters the concave groove 21 in the direction of arrow B in FIG. Step 24
And between the serrated steps 22 of the groove 21. As a result, the seal member 23 floats to some extent toward the tooth bottom surface 8A of the other side, and the inclined surface 22 of each serrated step 22 that faces the inclined surface 24B of each serrated step 24 of the seal member 23.
B is separated from each other, and each pressure space R is formed between them.

When the compressed air further flows into each of the pressure spaces R and the pressure in each of the pressure spaces R becomes high, this pressure presses the inclined surface 24B of each sawtooth step portion 24, and the sealing member 23. Is strongly pushed up toward the tooth bottom of the other party. As a result, the seal member 23 can be completely levitated toward the mating tooth bottom surface 8A as shown in FIGS. 4 and 5, and the sealing surface 23A of the seal member 23 can be reliably slid on the mating tooth bottom surface 8A. Can be contacted.

During the compression operation, the highest pressure from the compression chamber 15 located on the innermost peripheral side acts on the winding start end of the seal member 23 in the direction of arrow C in FIG. In the concave groove 21, it is pushed in the length direction (spiral direction) from the innermost peripheral side toward the outer peripheral side. As a result, the cut surface 24A of each serrated step portion 24 of the seal member 23 is pressed against the rising surface 22A of each serrated step portion 22. As a result, the compressed air that tends to flow from the pressure space R on the high pressure side (right side in FIG. 4) toward the pressure space R on the adjacent low pressure side can be interrupted between the cut surface 24A and the rising surface 22A. Therefore, each pressure space R can be maintained at a high pressure.

Thus, according to this embodiment, during the compression operation, the compressed fluid is generated in each pressure space R formed between each serrated step portion 24 of the seal member 23 and the serrated step portion 22 of the concave groove 21. Can be made to flow in, and each pressure space R can be made into a high pressure state. The pressure in each pressure space R presses the inclined surface 24B of each sawtooth step 24 of the seal member 23, and the seal member 23 can be completely floated up toward the mating tooth bottom surface 8A. Sealing surface 2 of member 23
3A can be surely brought into sliding contact with the tooth bottom surface 8A of the other party. As a result, the gap between the wrap portion 3 and the tooth bottom surface 8A of the end plate 8 can be hermetically sealed, and the compression efficiency can be significantly improved.

During the compression operation, the seal member 23 receives a pressure in the direction of arrow C in FIG. 4 and is pushed in the length direction (spiral direction) from the innermost peripheral side toward the outer peripheral side. The cut surface 24 of each sawtooth step 24 of the seal member 23
A and the rising surface 22A of each serrated step 22 can be brought into sliding contact with each other for sealing. As a result, the pressure space R on the low pressure side adjacent to the pressure space R on the high pressure side (the right side in FIG. 4).
It is possible to effectively prevent the compressed air from leaking toward the inside of the compression chamber 15 through the gap S between the bottom surface of the concave groove 5 and the seal member 6 as in the prior art. It is possible to reliably prevent the compressed air from leaking toward the compression chamber 15 on the outer peripheral side. Furthermore, since each pressure space R can be maintained in a high pressure state, the seal member 23 can be reliably floated toward the mating tooth bottom surface 8A, and stable sealing performance can always be obtained.

Further, even when the compression operation is stopped, the sawtooth step portion 24 of the seal member 23 and the sawtooth step portion 22 of the concave groove 21 are engaged with each other, so that the sawtooth step portion 24 is cut. The surface 24A and the rising surface 22A of the saw-toothed step portion 22 are in contact with each other, whereby the gap in the concave groove 21 is cut off in multiple layers. Therefore, when the compression operation is started, even if the pressure in each compression chamber 15 is not sufficiently increased as immediately after the start of the compression operation, the compressed air is made to flow into each pressure space R to seal the space. The member 23 is the tooth bottom surface 8
It can be reliably floated to A, and excellent sealing properties can be exhibited immediately after the start of compression operation.

Furthermore, since the seal member 23 can be surely floated so as to come into sliding contact with the tooth bottom surface 8A of the other party, the seal surface 23A of the seal member 23 will be removed by using the scroll type air compressor for a long period of time. Even if it wears due to frictional contact with the tooth bottom surface 8A of the other party, it is possible to prevent the deterioration of the sealing property and improve the durability.

Next, FIGS. 6 and 7 show a second embodiment of the present invention. The feature of this embodiment is that the bottom side of the groove is an engaging member which is a separate member from the wrap portion of the fixed scroll. Is provided
A serrated step is formed on the surface of the engaging member.

In the figure, 31 indicates a backup seal as an engaging member provided on the bottom side in the concave groove 5 formed on the tooth top surface of the wrap portion 3, and the backup seal 31 is
For example, a resin material having a self-lubricating property or a metal material similar to the wrap portion 3 of the fixed scroll 1 is formed as a strip-shaped material separate from the wrap portion 3. The backup seal 31 is arranged in a close-fitting state or a press-fitting state so as to come into contact with the bottom surface of the concave groove 5, and extends in a spiral shape along the length direction of the concave groove 5.

Further, the backup seal 31 is formed with a plurality of sawtooth step portions 32, 32, ... Consecutively in the length direction on the surface facing a floating seal 33 described later. Each of the sawtooth step portions 32 has a rising surface 32A extending substantially vertically upward from the bottom side of the concave groove 5 toward the other tooth bottom surface 8A side, and is gradually inclined downward from the upper end side of the rising surface 32A. Is formed in a sawtooth shape in a vertical cross section. In addition, each sawtooth step 32
32A of the wrap portion 3 faces the high-pressure side (right side in FIG. 2) close to the winding start end side, and the inclined surface 32B faces the low-pressure side (left side in FIG. 2) close to the winding end end side of the wrap portion 3. Is formed.

Reference numeral 33 denotes a floating seal which is located on the backup seal 31 and is mounted in the groove 5.
The floating seal 33 is formed in substantially the same manner as the sealing member 23 described in the first embodiment, and the floating seal 33 has a sealing surface 33A on the upper side surface facing the tooth bottom surface 8A of the end plate 8. Further, on the lower surface of the floating seal 33, there are a plurality of sawtooth step portions 34, 34, ... As a plurality of other sawtooth step portions which engage with the sawtooth step portions 32 of the backup seal 31 facing each other. Are continuously formed in the length direction of the.
Each of the sawtooth steps 34 is formed in a sawtooth shape in a vertical cross section, which includes a cut surface 34A and an inclined surface 34B.

Here, during the compression operation, the compressed air in the compression chamber 15 on the high pressure side penetrates into the concave groove 5, and the backup seal 31 facing the respective serrated steps 34 of the floating seal 33. When the floating seal 33 flows in between each serrated step 32 and the floating seal 33 floats toward the mating tooth bottom surface 8A as shown in FIGS. 6 and 7, the inclined surface 34B of each serrated step 34B. And the inclined surfaces 32B of the saw-toothed stepped portions 32 facing each other are separated from each other, and a plurality of pressure spaces R ', R', ... Are formed between them.
Then, when the compressed air flows into each pressure space R ', the pressure inside the pressure space R'becomes high, and this pressure causes the floating seal 33 to float so as to come into sliding contact with the mating tooth bottom surface 8A.

According to the present embodiment constructed as described above, substantially the same effects as those of the first embodiment can be obtained. In particular, in the present embodiment, the sawtooth step 32 is formed in the groove 5. The backup seal 31 having the above is provided separately from the wrap portion 3 of the fixed scroll 1, and the floating seal 3
The saw-toothed step portion 34 that engages with the saw-toothed step portion 32 of the backup seal 31 is formed in the third seal 3, so that the saw-tooth step portion 22 is formed on the bottom surface of the concave groove 21 as in the first embodiment.
It is not necessary to form the above, and even in the existing scroll air compressor, the backup tooth 31 is installed in the concave groove of the wrap portion of the fixed scroll, and the serrated step portion 32 is provided on the bottom side of the concave groove. Therefore, the present invention can be easily implemented.

In the first embodiment, the groove 2 having the serrated step portions 22 in the wrap portion 3 of the fixed scroll 1 is used.
1 is provided and the seal member 23 having the sawtooth step portions 24 is inserted into the concave groove 21, but the present invention is not limited to this, and for example, the wrap portion 9 of the orbiting scroll 7 is provided.
It is also possible to provide a concave groove having a sawtooth step portion and to provide a seal member having another sawtooth step portion in the concave groove.

Also in the second embodiment described above, the backup seal 31 and the floating seal 33 are provided in the concave groove 5 formed in the wrap portion 3 of the fixed scroll 1, but the present invention is not limited thereto. For example, the backup seal 31 and the floating seal 33 may be provided in the concave groove 11 formed in the wrap portion 9 of the orbiting scroll 7.

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

[0052]

As described above in detail, according to the present invention, a saw-toothed step portion is provided on the bottom side of the groove, and another saw-toothed step portion that engages with the sawtooth step portion is provided on the seal member. Since a plurality of pressure spaces are formed between the serrated step on the concave groove side and the serrated step on the seal member side, a plurality of pressure spaces are formed. With this, each pressure space can be brought to a high pressure state, and this pressure can reliably raise the seal member so as to make sliding contact with the tooth bottom surface of the other party. Therefore, it is possible to hermetically seal between the tooth top of the wrap portion and the tooth bottom surface of the other side, and it is possible to significantly improve the compression efficiency.

In particular, since the serrated step portion on the concave groove side and the serrated step portion on the seal member side are engaged with each other, as in the prior art, the serrated step portion is directed from the inner peripheral side to the outer peripheral side in the concave groove. It is possible to prevent the formation of a gap that communicates in the length direction (spiral direction), and it is possible to reliably prevent compressed air from leaking from the inner peripheral side toward the outer peripheral side along the gap. As a result, the airtightness of each compression chamber can be ensured, compressed air can be allowed to flow into each pressure space without leaking, and the seal member can be surely brought into sliding contact with the tooth bottom surface of the other party to improve the sealing performance.

[Brief description of drawings]

FIG. 1 is a lateral cross-sectional view showing, in an enlarged manner, a wrap portion, respective sealing members and the like of a scroll type air compressor according to a first embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view as seen from the direction of arrows II-II in FIG.

3 is a cross-sectional view as seen from the direction of arrows III-III in FIG.

FIG. 4 is a vertical cross-sectional view at the same position as in FIG. 2, showing a state in which a seal member has floated and slidably contacts the tooth bottom surface of the other party.

5 is a cross-sectional view as seen from the direction of arrows VV in FIG.

FIG. 6 is a longitudinal sectional view of the same position as in FIG. 2 showing a wrap portion, a floating seal, a backup seal and the like of a scroll type air compressor according to a second embodiment of the present invention.

7 is a cross-sectional view as seen from the direction of arrows VII-VII in FIG.

FIG. 8 is a vertical cross-sectional view showing a fixed scroll, an orbiting scroll, each seal member, and the like of a scroll air compressor according to a conventional technique.

9 is a cross-sectional view as seen from the direction of the arrow IX-IX in FIG.

FIG. 10 is an enlarged cross-sectional view showing a main part in FIG.

[Explanation of symbols]

 1 Fixed scroll 2,8 End plate 2A, 8A Teeth bottom surface 3,9 Lap part 7 Orbiting scroll 15 Compression chamber 21 Recessed groove 22, 24, 32, 34 Serrated step 23 Seal member 31 Backup seal 33 Floating seal

Claims (1)

[Claims] 1. A plurality of compression chambers are provided between a fixed scroll in which a spiral wrap portion is erected from the tooth bottom surface of the fixed-side end plate and a fixed scroll provided so as to face the fixed scroll. A swirl scroll in which a spiral wrap portion is erected from the tooth bottom surface of the swivel side end plate so as to define, and at least one of the wrap portions of the fixed scroll and the swivel scroll, In a scroll type fluid machine in which a groove extending along the tooth top surface of the wrap portion is formed, and a seal member which is in sliding contact with the tooth bottom surface of the other side is attached to the groove, a bottom side of the groove is provided. A serrated step is provided, another serrated step that engages with the serrated step is formed on the seal member, and the serrated step on the concave groove side and the serrated step on the seal member side are formed. A pressure space is formed when a compressed fluid flows in between A scroll type fluid machine having the above-mentioned configuration.