JP2003129970A - Scroll fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing structure of multistep compression type scroll fluid machinery capable of preventing a leakage of high pressure compressed fluid from a rear step compression part into a front step compression part. SOLUTION: Spiral lap grooves 27, 28 are formed on a fluid take-in end side of an initial step compression part from the vicinity of a discharge port of compressed fluid in a final step compression part. A land part 9a provided with a discharge port 2e provided at a terminal on a front step compression part side and a suction port 2f for absorbing compressed fluid from the discharge port into a rear step compression part side is provided between the final step compression part and the initial step compression part of the lap groove. A seal member 25 for preventing a leakage of compressed fluid into a discharge port opening side of the front step compression part from the rear step compression part side is arranged on a land face of the land part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine for compressing, expanding, and pumping a fluid, and more particularly to cooling a fluid compressed by a pre-compression section and further compressing it by a post-compression section. The present invention relates to a seal structure for a scroll fluid machine including a multi-stage fluid compression section in which a seal member for preventing leakage of compressed fluid from the rear compression section side is arranged.

[0002]

2. Description of the Related Art Conventionally, in scroll fluid machines, in order to normally generate high heat due to compression, orbiting scrolls and solid scrolls are cooled by cooling air or a cooling fluid, and high heat generated by compression of the fluid is cooled.
The compression ratio can be made higher than usual by increasing the number of turns of the scroll wrap. However, if the compression ratio is made larger than usual, not only the structure becomes large, but also the heat higher than usual generated by the compression of the fluid causes a problem of shortening the life of the bearing and the seal member.

Therefore, since it is necessary to cool the orbiting scroll and the solid scroll by increasing the amount of cold heat of the cooling device more than usual, it is necessary to enlarge the structure of the cooling device. Then, the scroll fluid mechanism takes in fluid from the outer peripheral side of the orbiting scroll end plate, reduces the compression space taking in the fluid toward the center side, and performs fluid compression,
Since the liquid is discharged from the discharge port on the center side, advanced technology is required to efficiently cool the center portion.

For this reason, a cooler is arranged close to the scroll fluid mechanism, the compression section of the scroll fluid machine is divided into two stages, and the compressed fluid is passed through the cooler from the previous stage to be cooled and introduced into the latter stage. There is a demand for a multistage compression scroll fluid machine that performs compression again. The multi-stage compression type scroll fluid machine suppresses the temperature to a level that the scroll fluid mechanism can endure by compression up to the previous stage, and after cooling, compresses in the latter stage up to the compressed fluid discharge temperature of the first stage so that the desired compression ratio can be achieved without becoming higher than usual. Can be obtained.

As the above-mentioned multi-stage compression type scroll fluid machine, the scroll part of the scroll fluid machine is divided into two stages, and the compressed fluid is passed through the cooler from the preceding stage to be cooled and introduced to the latter stage to perform compression again. Fluid machinery is disclosed in JP-A-5
No. 4,59,608.

[0006]

However, such a conventional technique has the following problems.
This will be described with reference to FIGS. 10 to 12. The discharge port 2e in the vicinity of the final compression chamber of the former compression unit and the suction port 2f communicating with the working space of the latter compression unit are connected by piping via a cooler (not shown) to form an intermediate path.

Now, after the compression space S3 of the pre-stage compression section communicates with the discharge port 2e of the pre-stage compression section, as shown in FIG.
The compression spaces S6 and T6 of the latter compression unit are in communication with the compression space S5 of the former compression unit. Orbiting scroll wrap 10b
By the swiveling drive of the compression space S6, the compressed fluid as the compression space S6 is compressed as the compression space S8, and the compression fluid as the compression space T6 is compressed as the compression space T8. Therefore, the compression space S8 or T8 has a higher pressure than the compression space S6 or T6.

Now, a sectional view taken along the line AA in FIG.
(A)), BB sectional view (FIG. 11 (b)), and CC sectional view (FIG. 12), as shown in FIG.
The tip seal 53 is inserted in the groove 41 at the top of b and the groove 40 at the top of the fixed scroll wrap 9c.
Since the tip seal 53 is formed to be narrower than the width of the grooves 40 and 41, the tip seals 53 and 53 receive the pressure of the compressed fluid on the lower surface and press against the opposite mirror surface when the compression space is compressing the fluid. At the same time, it is pressed against the groove wall surface on the low pressure side from the high pressure side.

Therefore, from the compression space T6, FIG.
The passages 30 and 31 are formed to communicate with each other as shown in (a),
It is possible to leak into the space T6 where the pressure is low. Further, from the compression space S8, as shown in FIG.
1 is formed in communication with each other and can leak into the space S6 having a low pressure. Although the chip seal is pressed against the groove wall surface from the high pressure side to the low pressure side, the chip seal surface and the chip seal groove surface cannot be completely adhered to each other due to the flatness of each other, and the sectional view taken along the line CC in FIG. As shown in FIG. 12A, the high-pressure fluid can leak into the space 80 between the tip seals 14 and 53 as indicated by the arrow 76.

A gap exists between the bottom surface of the orbiting scroll lap groove and the tip seal 53, and the passage 41b (FIGS. 11 (b) and 12 (b)) due to the gap is compressed by the high-pressure compressed fluid to a low pressure. Can be leaked to the side. That is, in the end portion 10d of the orbiting scroll wrap 10b, there is a gap between the end portion 41a of the wrap groove 41 and the end portion 53a of the tip seal 53, and the leakage of the compressed fluid as indicated by the arrow 78 does not occur from the gap. It is possible, and the compressed fluid can leak from the passage 51 as indicated by the arrow 77 even in the middle thereof. Therefore, as shown in FIGS. 10 and 12 (a), the high-pressure fluid such as the arrows 29 and 76 leaks into the gap 80 between the tip seals 14 and 53 from the rear compression section to the front compression section,
There is a problem that they are taken into the pre-stage compression unit and re-compressed, so that high heat is generated and the compression load is increased, and compression power is required.

The present invention has been made to solve the above problems, and the present invention provides a seal structure for a multi-stage compression type scroll fluid machine which prevents leakage of high-pressure compressed fluid from a post-compression unit to a pre-compression unit. The purpose is to do.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a scroll fluid machine including a multi-stage fluid compression section for further compressing a fluid compressed by a preceding compression section by a subsequent compression section. A spiral wrap groove is formed from the vicinity of the discharge port of the compressed fluid of the stage compression section to the fluid intake end side of the first stage compression section, and the former stage is provided between the final stage compression section and the first stage compression section of the wrap groove. A land portion provided with a discharge port provided at a terminal end on the compression portion side and a suction port for sucking a compressed fluid from the discharge portion to the latter-stage compression portion side is provided, and the land portion facing the opposite scroll end plate. A seal member for preventing the compressed fluid from leaking from the rear stage compression unit side to the discharge port opening side of the front stage compression unit is disposed on the land surface.

In this case, according to the present invention, a scroll wrap having a tip seal arranged at the top for sliding in contact with the opposite scroll end plate is provided in a spiral shape from the vicinity of the compressed fluid discharge port of the final stage compression section to the first stage compression section. A wrap groove is formed by the scroll wraps arranged adjacent to the fluid intake end side, and the wrap groove is formed between the final stage compression section and the first stage compression section of the wrap groove. There is provided a land portion provided with a discharge port provided at the end on the side and a suction port for sucking the compressed fluid from the discharge port toward the latter-stage compression section side. Therefore,
The land portion may be provided in the fixed scroll wrap groove or the orbiting scroll wrap groove.

Further, since the tip seal which is brought into contact with and slides on the counter scroll end plate is disposed on the top of the scroll wrap, the land surface of the land portion facing the counter scroll end plate and the counter scroll end plate are arranged. A space corresponding to the amount of the tip seal is formed between them, and the discharge opening and the suction opening formed on the land surface communicate with each other. Therefore, for example, the compressed fluid passing through the passages 30, 31 or the passages 32, 51 as shown in FIG. 11 or the compressed fluid as described in FIG. 12 leaks into the space S6 or T6 shown in FIG. According to the present invention, even if there is a compressed fluid such as the arrow 29 due to the fluid, the opposite scroll end plate surface is provided between the discharge opening and the suction opening formed in the land surface of the land portion. Since the seal member that comes into pressure contact is provided, it is possible to prevent the compressed fluid from leaking from the side of the latter stage compression section to the side of the discharge port opening of the front stage compression section.

The seal member includes a tip seal, which is spirally arranged on the tops of the lap walls on both sides forming the lap groove, and the discharge port opening and the suction port opening. And an intermediate seal member disposed in the.

That is, for example, as shown in FIG. 2, it can be composed of a rear-stage compression portion side sealing member (chip seal) 26, a front-stage compression portion side sealing member (chip seal) 14, and an intermediate sealing member 25.

Further, it is also an effective means of the present invention that the intermediate seal member is composed of an annular seal member that divides the latter-stage compression portion into an annular shape.

According to this technical means, for example, as shown in FIG. 6, since the intermediate seal member is formed in an annular shape, one annular seal member or at least the discharge port opening and the suction port opening is used. It can be configured as an annular seal member having a contact portion at a sufficiently separated position, and since there is no contact portion with another tip seal between the discharge port opening and the suction port opening, A compressed fluid does not leak, and an intermediate seal member is arranged between the discharge port opening and the suction port opening of the land surface, and the both ends and the tip seals on both sides are provided by the intermediate seal member. It is possible to prevent the leakage of the compressed fluid from the side compression section side to the discharge port opening side of the front stage compression section without making contact.

Further, the sealing member is arranged in a spiral shape from the fluid intake side of the front stage compression section toward the final discharge port side of the rear stage compression section, and the land surface of the seal member is provided on the way. A first seal member arranged so as to partition the discharge opening and the suction opening, and the first seal member on the opposite side of the land surface in the vicinity of the discharge opening from the suction opening. An end portion of the first seal member that abuts the surface of the first sealing member, extends from the vicinity of the discharge port opening to the vicinity of the discharge port opening by surrounding the latter-stage compression portion, and contacts the surface of the first seal member opposite to the discharge port opening. It is also an effective means of the present invention to construct it with two sealing members.

The tip seal groove spirally arranged from the fluid intake side of the first stage compression section toward the compressed fluid discharge port side of the final stage compression section, and the discharge port opening and There is an intermediate groove continuous with the chip seal groove that is arranged with the suction port opening interposed, and the groove and the chip seal groove are fitted and arranged with the seal member composed of a plurality of chip seals. The seal member includes a first tip seal that extends from the compressed fluid discharge port side of the final stage compression section through the intermediate groove toward the first stage compression section, and the final stage compression section along with the first tip seal. A second tip seal which is disposed in the tip seal groove from the compressed fluid discharge port side and separates from the first tip seal near the suction port opening of the land portion and contacts the first tip seal near the discharge port opening. And a second chip seal near the suction port and arranged in the chip seal groove, and a first chip seal from the intermediate groove near the discharge port toward the first-stage compression section. It is also an effective means of the present invention to construct it with a three-tip seal.

According to such a technical means, the leakage of the compressed fluid is prevented by the one tip seal between the discharge opening and the suction opening, so that the end contact with the tip seals on both sides is performed. The sealing property is improved because there is no

In particular, according to the above technical means using three tip seals, as shown in FIG. 8, a third tip seal 69 is provided on the outer peripheral side of the second tip seal 69 which contacts the first tip seal 67 in the vicinity of the opening of the discharge port. Since the tip seal 68 is arranged, the first tip seal 67 and the second tip seal 69 are provided.
The contact portion with is further covered by the third tip seal 68, and leakage of the compressed fluid is further prevented.

The tip seal groove is spirally arranged from the fluid intake side of the first stage compression section toward the compressed fluid discharge port side of the final stage compression section, and the discharge port opening and The seal member has an intermediate groove continuous with the chip seal groove arranged with the suction port opening interposed therebetween, and the seal member is configured by one chip seal communicating the chip seal groove and the intermediate groove. Is also an effective means of the present invention. According to such a technical means, it is possible to prevent the compressed fluid from leaking by one tip seal, so that the number of parts is reduced.

In particular, by inserting a chip seal portion corresponding to the intermediate groove in the land portion into the intermediate groove, it is possible to assemble with reference to the intermediate groove, so that one tip seal end portion is the tip seal groove end. If you insert it beyond the end, you do not have to shift it again and insert it again.If you insert the part corresponding to the middle groove into the middle groove, the part will be moved from that part to the end of the tip seal. Simply insert the tip seal into the groove to assemble and the assembly is easy.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative positions, etc., of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples unless otherwise specified. Not too much.

FIG. 1 is a sectional view of a scroll fluid machine according to an embodiment of the present invention, FIG. 2 is a perspective view of a fixed scroll housing, FIG. 3 is a perspective view of an orbiting scroll, and FIG.
Is an explanatory view for explaining a fluid compression state when the fluid is taken in by the orbiting scroll, and FIG.
6 is an explanatory view illustrating a fluid compression state when the orbiting scroll wrap is rotated, FIG. 6 is an explanatory view showing a second embodiment of the seal structure according to the present invention, and FIG. 7 is a seal structure according to the present invention. 8 is an explanatory view showing the third embodiment of FIG.
FIG. 9 is an explanatory view showing a seal structure according to a fourth embodiment of the present invention, and FIG. 9 is an explanatory view showing a seal structure according to a fifth embodiment of the present invention.

In FIG. 1, a multi-stage scroll fluid mechanism body 1 comprises a fixed scroll housing 2 to which a housing cover 4 is attached, and a drive shaft housing 3 to which the fixed scroll housing 2 is attached. A cooling chamber 24 is provided between the discharge pipe 6 attached to the discharge port of the former compression unit of the fixed scroll housing described later and the suction pipe 7 attached to the suction port of the latter compression unit. The cooling chamber 24, the discharge pipe 6, and the suction pipe 7 are connected by a pipe to form an intermediate path.

This intermediate path has the total volume of the front-stage discharge port 2e and the rear-stage suction port 2f shown in FIG. 2 and the pipes that pass through the inside of the cooling chamber 24 interposed between them. It is set to N (integer) times the final compression chamber volume of the compression section. Then, after N times of discharge from the final compression chamber of the preceding compression unit, the first stage intake of the latter compression unit is taken in by a volume equal to the final compression chamber volume of the former compression unit.

However, during the initial operation, the scroll fluid machine is in a stopped state, and the final compression chamber of the latter stage compression section of the fluid compression space formed by the fixed scroll wrap and the orbiting scroll wrap has a discharge port of the latter stage compression section. Two
Since the fluid exists at a pressure equal to or lower than the external pressure of d (FIG. 1), and the fluid in the initial intake space of the latter-stage compression section communicates with the intermediate path, the former-stage compression section takes in the fluid. May fall to pressure.

When the initial operation is started in this state, the residual fluid in the latter-stage compression section is compressed until it becomes higher than the external pressure. That is, when the pressure of the final compression chamber of the latter-stage compression unit is combined with the compressed fluid of the compression chamber in front of it and becomes higher than the external pressure, it is discharged to the outside. The fluid is taken in, combined with the fluid on the discharge port side, and compressed.

At the end of the initial operation, after the discharge from the final compression chamber of the preceding compression unit N times, the first stage intake of the latter compression unit is equal to the volume of the last compression chamber of the former compression unit. The operating state is such that it is taken in. Now,
As shown in FIG. 2, the fixed scroll housing 2 is formed in the shape of a circular tray, and mounting portions 2i, 2j, 2k for coupling with a drive shaft housing 3 described later at a coupling surface 2m are provided at three locations on the outer peripheral surface in the circumferential direction. The mirror surface 2c is provided in the recess, and the mirror surface 2c communicates with the suction port 2a provided inside the mounting portion 2i.

The coupling surface 2m is provided with a groove inside the portion which is not connected to the drive shaft housing 3 and in which a dust seal 12 having a self-lubricating property such as a fluorine resin is disposed. ing.

The mirror surface 2c is provided with a front-stage discharge port 2e (FIGS. 4 and 5) connected to the discharge pipe 6 shown in FIG. 1 and a rear-stage suction port 2f (FIGS. 4 and 5) connected to the suction pipe 7. And a fixed scroll wrap 9b that forms a front-stage compression portion in a counterclockwise direction from the land portion 9a in which these holes are formed.
However, a fixed scroll wrap 9c that forms the latter-stage compression portion in a clockwise direction is spirally planted. A groove is provided at the upper end of these laps, and a chip seal 14 having a self-lubricating property such as a fluorine resin is fitted in the groove.

An intermediate seal member 25 having a self-lubricating property, such as a fluorine resin, is disposed between the chip seals 14, 14 disposed on the side surface of the land 9a. The intermediate seal member 25 prevents the high-pressure compressed fluid from leaking and being trapped from the latter-stage compression section side to the former-stage compression section side and being again pumped to the latter-stage compression section side.

As shown in FIG. 1, a cooling fin 2b is planted on the back side of the mirror surface 2c of the fixed scroll housing 2, and a housing cover 4 is attached to the top of the cooling fin 2b to form a cooling passage 2n. ing. Therefore, FIG.
The fixed scroll is configured to be cooled by the cooling air flowing in the direction of penetrating the sheet. A pipe 5 is attached to the suction port 2a so that the fluid can be taken in.

The orbiting scroll 11 has a mirror surface 10c,
As shown in FIG. 1, the mirror surface 10c is arranged in contact with a dust seal 12 provided on the coupling surface of the fixed scroll housing 2 so as to face the mirror surface 10c. 10a, and the orbiting scroll wrap 10b which is planted on the center side and constitutes the latter-stage compression section. A groove is provided at the upper end of these laps, and a chip seal 13 having a self-lubricating property such as a fluorine resin is fitted in the groove.

And, these orbiting scroll wraps 1
In 0a and 10b, the fixed scroll wraps 9b and 9c and the wall surfaces are arranged to face each other. A cooling fin 11a is planted on the back side of the mirror surface 10c as shown in FIG. 1, and an auxiliary cover 15 is attached to the top of the cooling fin 11a to form a cooling passage 11n. Therefore, the orbiting scroll can be cooled by the cooling air flowing in the direction passing through the plane of the drawing of FIG.

The auxiliary cover 15 is provided with a bearing bearing 18 on the center side thereof, into which a tip eccentric portion 16a of a rotary drive shaft 16 which will be described later is rotatably fitted, and on the outer peripheral side thereof is divided into three equal parts in the circumferential direction. A bearing bearing 19 for receiving a crank member for preventing rotation of the orbiting scroll is arranged at the position.

This crank member is composed of a shaft 22 fitted to the bearing bearing 19 on one surface of the plate member 21 and a shaft 23 having an axial position eccentric to the shaft 22 on the other surface. The shaft 23 is configured to be fitted and positioned with a bearing bearing 20 provided in the drive shaft housing 3. Therefore, the orbiting scroll 11 is revolvable with respect to the fixed scroll by the eccentric rotation of the tip eccentric portion 16a of the rotary drive shaft 16.

The drive shaft housing 3 has an opening in a direction that penetrates the plane of the drawing of FIG. 1, and is configured to be able to cool the cooling fin 11a portion of the orbiting scroll by the flowing cooling air. And, by the bearing bearing 17 in the central portion,
A rotary drive shaft 1 connected to a rotary shaft of a drive motor (not shown)
6 is rotatably held.

Scroll body 1 having such a configuration
As shown in FIG. 1, rotation of the rotary drive shaft 16 causes the eccentric shaft portion 16a to rotate about the shaft center 16b, causing the orbiting scroll 11 to revolve, and as shown in FIG. The compressed fluid sucked from the suction port 2a is taken in by the orbiting scroll wrap 10a and taken in by the closed spaces S1 and T1 formed by this wrap and the fixed scroll wrap 9b.

These working spaces are shifted by 180 °, but at the same time, they are taken in by an approximately equal volume. As shown in FIGS. 4 and 5, this closed space is sequentially compressed as S1 in FIG. 4, S1 → S2 → S3 → S4, and from S5, the front discharge port 2e → the intermediate path → the rear suction. Mouth 2
The compression is f → S6 → S7 → S8 → S9, and in FIG.
The enclosed space taken in as 1 is T1 → T2 → T3 in order
And compressed from T4 to the front discharge port 2e → intermediate path → back suction port 2f → T5 → T6 → T7 → T8 → T9 and sent to the central part, where S9 and T9 merge and exit discharge port 2d. Is discharged from the pipe 8.

As shown in FIG. 4, the enclosed spaces S8 and T
Since 9 has the same volume, the fluid of the same pressure is discharged. In this fluid compression process, as shown in FIG.
An intermediate seal member 25 having a self-lubricating property, such as a fluorine resin, is disposed between the chip seals 14 disposed on the side surface of the land 9a. Therefore, even if there is a high-pressure compressed fluid leaking from the latter-stage compression section side as indicated by the arrow 29, it is blocked by the intermediate seal member 25, the leaked high-pressure compressed fluid is trapped on the front-stage compression section side, and the latter-stage compression section is again compressed. It is possible to prevent the pressure from being fed to the part side.

FIG. 6 shows a second embodiment of the seal structure. Instead of the tip seal 14 shown in the first embodiment, a tip seal is used as the tip seal 63 on the front compression section side.
And the tip seal 65A on the rear-stage compression section side, and the intermediate seal 64 separates the discharge port 2e of the front-stage compression section from the suction port 2f of the rear-stage compression section and surrounds the rear-stage compression section in an annular shape. . It is possible to prevent the high-pressure fluid from leaking to the pre-stage compression section side as shown by the arrow. FIG. 7 shows a third embodiment of the seal structure. The present embodiment is provided with a tip seal 65B in which tip seals are continuously provided from the former compression section to the latter compression section, and a tip seal 66 that surrounds the outer side of the latter compression section. 2e and the suction port 2f of the latter-stage compression section are arranged separately. It is possible to prevent the high-pressure fluid from leaking to the pre-stage compression section side as shown by the arrow.

FIG. 8 shows a fourth embodiment of the seal structure. In this embodiment, three tip seals 67, 68, and 69 are used, that is, the tip seal 67 continuously provided from the pre-stage compression section to the post-stage compression section and the post-stage compression together with the tip seal 67. From the discharge port of the part
a is arranged up to the suction port 2f of the latter stage compression unit, and thereafter,
A tip seal 69 that surrounds the outside of the latter-stage compression section together with the tip seal 68 and is arranged up to the discharge port 2e of the former-stage compression section.
And the tip seal 69 together with the discharge port 2 of the former compression unit.
The outer side of the latter-stage compression portion is surrounded up to e, and thereafter, the tip seal 67 and the tip seal 68 fitted and arranged in the wrap of the former-stage compression portion are formed. It is possible to prevent the high-pressure fluid from leaking to the pre-stage compression section side as shown by the arrow.

FIG. 9 shows a seal structure according to a fifth embodiment. In this embodiment, one tip seal 70 is connected to the groove at the top of the wrap from the front-stage compression section to the rear-stage compression section. The chip seal 70 is provided with a void 71 in the land portion 9a, and all the cross-sectional areas are made substantially equal to prevent distortion. Since it is configured as a single tip seal, it is possible to well prevent leakage of the high-pressure fluid to the pre-stage compression section side as shown by the arrow.

Therefore, according to the present embodiment, between the discharge port opening and the suction port opening formed in the land surface of the land portion, a seal member that is in pressure contact with the opposite scroll end plate surface is provided. Since it is provided, it is possible to prevent the compressed fluid from leaking from the latter-stage compression section side to the discharge port opening side of the former-stage compression section.

[0048]

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll fluid machine according to an embodiment of the present invention.

FIG. 2 is a perspective view of a fixed scroll housing.

FIG. 3 is a perspective view of an orbiting scroll.

FIG. 4 is an explanatory diagram illustrating a fluid compression state when fluid is taken in by an orbiting scroll wrap.

FIG. 5 is an explanatory diagram illustrating a fluid compression state when the 180 ° orbiting scroll wrap is rotated from FIG. 4;

FIG. 6 is an explanatory view showing a second embodiment of the seal structure according to the present invention.

FIG. 7 is an explanatory view showing a third embodiment of the seal structure according to the present invention.

FIG. 8 is an explanatory view showing a fourth embodiment of the seal structure according to the present invention.

FIG. 9 is an explanatory view showing a fifth embodiment of the seal structure according to the present invention.

FIG. 10 is an explanatory diagram illustrating a compressed fluid intake operation of the latter-stage compression section according to the conventional technique.

11 is a sectional view taken along the line AA and a sectional view taken along the line BB in FIG.

12 is a sectional view taken along line CC of FIG. 10 and a sectional view taken along line DD of FIG.

[Explanation of symbols]

1 Scroll fluid machine body, 2 fixed scroll housing, 2e outlet, 2f suction port, 3 drive shaft housing, 9a Land part, 11 orbiting scroll 24 Cooling room 25 Intermediate seal member (seal member) 27, 28 Fixed scroll wrap groove

Continued front page    F-term (reference) 3H029 AA02 AA17 AB01 BB16 CC19                       CC24 CC25                 3H039 AA01 AA14 BB07 BB15 CC02                       CC03 CC04 CC06 CC07 CC28                       CC29 CC31

Claims (6)

[Claims] 1. A scroll fluid machine comprising a multi-stage fluid compression section for further compressing a fluid compressed by a front-stage compression section by a rear-stage compression section, from a discharge port for compressed fluid of a final-stage compression section to a first-stage compression section. A spiral wrap groove is formed on the fluid intake end side, and between the final stage compression section and the first stage compression section of the wrap groove, the discharge port provided at the end on the front stage compression section side and the discharge port A land part provided with a suction port for sucking the compressed fluid of the second stage compression part side, and a land surface of the land part facing the opposite scroll end plate from the second stage compression part side to the first stage compression part. A scroll fluid machine provided with a multi-stage fluid compression section, characterized in that a seal member for preventing leakage of the compressed fluid to the discharge port opening side is disposed. 2. The seal member is arranged between a tip seal spirally arranged on the tops of the lap walls on both sides forming the lap groove, and the discharge port opening and the suction port opening. It is comprised with an intermediate | middle seal member, It is characterized by the above-mentioned.
A scroll fluid machine provided with the described multi-stage fluid compression unit. 3. The scroll fluid machine according to claim 2, wherein the intermediate seal member is an annular seal member that divides the latter-stage compression section into an annular shape. 4. The seal member is arranged in a spiral shape from the fluid intake side of the front stage compression section toward the final discharge port side of the rear stage compression section, and the land surface of the land surface is provided in the middle thereof. A first seal member arranged so as to partition the discharge port opening and the suction port opening; and the first seal member on the opposite side of the land surface in the vicinity of the discharge port opening from the suction port opening. An end portion of the first seal member that abuts the surface of the first sealing member, extends from the vicinity of the discharge port opening to the vicinity of the discharge port opening by surrounding the latter-stage compression portion, and contacts the surface of the first seal member opposite to the discharge port opening. The scroll fluid machine according to claim 1, wherein the scroll fluid machine comprises two seal members. 5. A tip seal groove spirally arranged from the fluid intake side of the first stage compression section toward the compressed fluid discharge port side of the final stage compression section, and the discharge port opening and the discharge port opening in the land section. There is an intermediate groove continuous with the chip seal groove that is arranged with the suction port opening interposed, and the seal member configured by a plurality of chip seals is fitted and arranged in the intermediate groove and the chip seal groove. The seal member is a first member that extends from the compressed fluid discharge port side of the final stage compression section through the intermediate groove toward the first stage compression section side.
A tip seal, which is arranged in the tip seal groove along with the first tip seal from the compressed fluid discharge port side of the final stage compression section, and is separated from the first tip seal in the vicinity of the suction port opening of the land section. A second tip seal that is in contact with the first tip seal near the outlet opening and a second tip seal that is arranged near the suction opening along with the second tip seal in the tip seal groove to partition the latter-stage compression portion into an annular shape. At the same time, the multi-stage fluid compression unit according to claim 1, wherein the multi-stage fluid compression unit includes a first tip seal from the intermediate groove in the vicinity of the discharge port opening, and a third tip seal that faces the first-stage compression unit side. Scroll fluid machine equipped with. 6. A tip seal groove spirally arranged from the fluid intake side of the first stage compression section toward the compressed fluid discharge port side of the final stage compression section, and the discharge port opening and the discharge port opening in the land section. The seal member has an intermediate groove continuous with the chip seal groove arranged with the suction port opening interposed therebetween, and the seal member is configured by one chip seal communicating the chip seal groove and the intermediate groove. A scroll fluid machine comprising a multi-stage fluid compression unit according to claim 1.