JP2002130155A - Scroll fluid machine having multistage type fluid compressing part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multistage compression type scroll fluid machine for efficiently taking in a compressed fluid in a rear stage compressing part in a multistage scroll fluid machine having an intermediate passage between a front stage compressing part and the rear stage compressing part. SOLUTION: In this scroll fluid machine having a multistage type fluid compressing part for cooling the fluid compressed by the front stage compressing part and also compressing the fluid by the rear stage compressing part, the scroll fluid machine is characterized by forming an inlet 29 width of a rear stage compressing part side fixed scroll lap groove 28 supplied with the front stage compressed fluid from a supply passage communicating with the front stage compressing part side in a width narrower than a width of the fixed scroll lap groove.

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 a multistage compressor for cooling a fluid compressed by a preceding compression unit and further compressing the fluid by a subsequent compression unit. The present invention relates to a scroll fluid machine having a fluid compression unit.

[0002]

2. Description of the Related Art Conventionally, in a scroll fluid machine, orbiting scrolls and solid scrolls are usually cooled by cooling air or a cooling fluid to generate high heat, and high heat generated by compression of the fluid is cooled. The compression ratio can be made larger than usual by increasing the number of turns of the scroll wrap. However, when the compression ratio is made larger than usual, not only the structure becomes larger, but also the life of bearings and seal members is reduced due to higher heat generated by the compression of the fluid.

Therefore, 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, and thus it is necessary to increase the size of the structure of the cooling device. Then, the scroll fluid mechanism takes in the fluid from the outer peripheral side of the orbiting scroll end plate, reduces the compression space in which the fluid is taken in toward the center side, and performs fluid compression,
Since the liquid is discharged from the discharge hole on the center side, advanced technology is required to efficiently cool the central portion.

[0004] For this reason, a cooler is arranged in close proximity to the scroll fluid mechanism, the compression section of the scroll fluid machine is divided into two stages, and the compressed fluid is cooled through the cooler from the preceding stage and introduced into the latter stage. And a multi-stage compression scroll fluid machine that performs compression again. The multi-stage compression scroll fluid machine suppresses the temperature at which the scroll fluid mechanism can withstand the compression up to the previous stage, and obtains a desired compression ratio without being heated to a higher temperature than usual by compressing the compressed fluid of the previous stage at the subsequent stage after cooling. be able to.

As the multistage compression scroll fluid machine described above, the scroll portion of the scroll fluid machine is divided into two stages, and the compressed fluid is cooled from the preceding stage by passing through the cooler, introduced into the latter stage, and compressed again by the subsequent stage. Fluid machinery is disclosed in
It is known from JP 4-59608.

[0006]

However, according to the conventional technique, there are the following problems.
This will be described with reference to FIGS. The discharge hole 2e in the vicinity of the final compression chamber of the first compression unit is connected to the suction hole 2f communicating with the working space of the second compression unit by a pipe via a cooler to form an intermediate path.

Now, after the final compression space S3 of the first compression unit communicates with the discharge port 2e of the first compression unit, as shown in FIG. 9, the compression spaces S4 and T4 of the second compression unit are in communication with the compression space S3. Becomes As the compression space S3 is reduced by the orbital driving of the orbiting scroll wrap 10a, the final compression space T3 of the preceding compression section starts to open and the final compression space T3 communicates with the discharge hole 2e. The compressed fluid in the space T3 flows together with the compressed fluid in the compression space S3 into the suction hole 2f side of the subsequent compression section, and the intermediate path between the discharge hole 2e and the suction hole 2f depends on the volume of the intermediate path, There will be more compressed fluid than the volume of compressed fluid in one final compression space S3 or T3.

FIG. 9 shows an instantaneous state in which the final compression space S3 communicates with the spaces S4 and T4 on the subsequent compression section side, and FIG. 10 shows the final compression space T3 and the space S4 on the downstream compression section side.
And T4 communicate with each other for a moment, and when the orbiting scroll wrap 10b is driven to rotate, in the case of FIG.
g, the tip of the orbiting scroll wrap 10c in the case of FIG.
Is for contacting the fixed scroll wrap wall surface 2h to form the compression space S4 or T4 of the rear compression section.

However, in the state shown in FIGS. 9 and 10, the end portion 10c of the orbiting scroll wrap on the side of the rear compression section.
For a long period of time during which no compressed space is formed due to contact with the fixed scroll wrap wall surface 2g or 2h, the compressed fluid flows in from the intermediate path and becomes in a state of overpressure intake, exceeding a predetermined compression ratio, and generating heat. The amount will increase,
The desired specifications will not be satisfied.

In the multistage compression scroll fluid machine, if there is a difference between the volume taken in by one surface of the orbiting scroll wrap and the volume taken up by the other surface when the fluid is taken in by the precompression section, the precompression may be performed. A difference occurs in the fluid compression capacity of the final compression space of the section, and the volume discharged from the predetermined intermediate path and taken into the rear compression section, that is, the volume taken into the orbiting scroll wrap of the rear compression section is equal to both sides of the wrap. , The pressure fluctuates in the intermediate path due to the difference in the fluid compression capacity of the final compression space of the pre-compression unit for each surface of the orbiting scroll, and a difference occurs in the final discharge pressure at the discharge port.

In view of the above-mentioned circumstances, the present invention provides a multi-stage scroll type fluid machine having an intermediate path between a front stage compression unit and a rear stage compression unit, which efficiently takes in the compressed fluid in the rear stage compression unit. It is an object to provide a scroll fluid machine. Another object of the present invention is to
An object of the present invention is to provide a multi-stage compression scroll fluid machine having an intake passage narrower than the width of a scroll wrap groove of a rear-stage compression section. Another object of the present invention is to provide a multi-stage compression scroll fluid machine having a take-in passage narrower than the width of a scroll wrap groove of a rear-stage compression section, wherein the take-in passage and the scroll wrap wall surface are connected by a curved surface. That is.

[0012]

According to a first aspect of the present invention, there is provided a scroll fluid machine including a multi-stage fluid compression section for cooling a fluid compressed by a preceding compression section and further compressing the fluid by a subsequent compression section. The inlet width of the fixed scroll wrap groove on the side of the latter compression section to which the first compression fluid is supplied from the supply passage communicating with the first compression section is formed to be smaller than the width of the fixed scroll wrap groove. .

In the first aspect of the present invention, the fluid compressed by the first-stage compression section is cooled and conveyed to the second-stage compression section. A cooling means is interposed between the two compression sections. This cooling means may be a cooler connected by a pipe, or a means for arranging the pipe in a cooling atmosphere and cooling the pipe by forced air blowing.

The supply passage communicating with the first-stage compression section and the second-stage compression section supplies the cooled compressed fluid to the second-stage compression section. At the outlet side of the first-stage compression section, high heat generated is left on the fixed scroll side. It is desirable to discharge without
Therefore, it is preferable to arrange a heat insulating pipe on the outlet side. When the discharge port of the first compression section and the suction port of the second compression section are not insulated, the heat of the second compression section is prevented from being heated again by the high heat generated in the first compression section. It is good to arrange a heat insulating pipe in the area.

According to the first aspect of the present invention, the inlet width of the fixed scroll wrap groove on the side of the rear compression section to which the first-stage compressed fluid is supplied is formed to be narrower than the width of the fixed scroll wrap groove. The time during which the fluid intake end of the orbiting scroll wrap disposed in the inlet opens the inlet is shorter than when the entire width of the fixed scroll wrap groove is set as the inlet width, and excess fluid is removed from the supply passage. There is no overloading, no overloading occurs, the compression ratio exceeds the predetermined compression ratio, the calorific value increases, and the desired specifications are not satisfied. Therefore, it is possible to provide a multi-stage compression scroll fluid machine that efficiently takes in the compressed fluid in the rear compression section.

At the entrance of the fixed scroll wrap groove, a projection having a circular surface extending from the fixed scroll wrap groove is disposed on one side of the fixed scroll wrap groove forming the fixed scroll wrap groove. It is also an effective means of the first invention that the orbiting scroll end of the portion contacts the circular surface to take in the pre-stage compressed fluid.

According to this technical means, at the entrance of the fixed scroll wrap groove, on one fixed scroll wrap wall surface forming the fixed scroll wrap groove,
Since the projection having a circular surface extending from the wall surface is provided, the end of the orbiting scroll of the rear compression portion comes into contact with the circular surface, and the timing of taking in the front compression fluid is equal to that of the fixed scroll wrap groove. This is faster than when the entire width is set as the inlet width, and no extra fluid is taken in from the supply passage.

It is desirable that the projections be disposed on the wrap wall surfaces on both sides of the fixed scroll wrap groove. With such technical means, a multistage compression type scroll fluid which efficiently takes in the compressed fluid in the subsequent compression section is also provided. Machine can be provided.

The volume of the fluid intake space formed by the fixed scroll wrap and the orbiting scroll wrap on the front compression section side is substantially equal between the one wall side space and the other wall side space of the orbiting scroll wrap. In addition, it is also preferable that the closed-side space on the one wall side and the closed-side space on the other wall side of the orbiting scroll wrap in the final closed space on the side of the rear compression section formed by the fixed scroll wrap and the orbiting scroll wrap are substantially equal. This is an effective means of the invention.

According to the above-mentioned technical means, the volume of the fluid intake space on the pre-stage compression section side is substantially equal to each other on the both side wall spaces of the orbiting scroll wrap. The fluid intake is substantially equal on both sides of the wrap, so that the discharge amount of the compressed fluid at the discharge port of the former compression part is equally discharged in the compression spaces on both sides of the orbiting scroll wrap and discharged to the latter compression part side, and the fluid at the latter compression part side The intake is also performed stably without taking excess fluid from the supply passage, and is formed substantially equal to each other in the closed space on both side wall surfaces of the orbiting scroll wrap in the final sealed space on the side of the rear compression unit. Since the final sealed space communicates with the discharge holes, the same amount of compressed fluid is discharged from the final compression spaces on both sides, and an efficient multistage compression scroller is provided. It is possible to provide a fluid machine.

According to a second aspect of the present invention, there is provided a scroll fluid machine provided with a multistage fluid compression section for cooling a fluid compressed by a preceding compression section and further compressing the fluid by a subsequent compression section. Are provided spirally from the outer peripheral side of the fixed scroll toward the discharge hole on the center side, and the wrap groove is compressed in the former stage from the outer peripheral side to the discharge hole. A suction / discharge unit provided with a front-stage discharge port for discharging the compressed fluid compressed by the part, and a rear-stage suction port for receiving a compressed fluid from the front-stage discharge port via an intermediate path; Of the hole, the front-stage outlet, and the rear-stage inlet,
A heat insulating pipe is arranged at least in the discharge port at the front stage.

According to the second aspect of the present invention, a wrap groove, which is arranged so that the wall surface of the orbiting scroll wrap faces, is provided spirally from the outer peripheral side of the fixed scroll toward the discharge hole on the center side, and the wrap groove is provided in the wrap groove. Between the outer peripheral side and the discharge hole, a front-stage discharge port for discharging the compressed fluid compressed in the front-stage compression section, and a rear-stage suction port for the rear-stage compression section that receives the compressed fluid from the front-stage discharge port via an intermediate path. Provided with a suction / discharge section provided with, the fluid compressed by the pre-compression section,
The present invention relates to a scroll fluid machine including a multi-stage fluid compression unit having two or more stages that is cooled and further compressed by a subsequent-stage compression unit.

According to the second aspect of the present invention, the discharge hole on the center side,
A heat-insulating pipe is arranged at least in the front-stage discharge port of the front-stage discharge port and the rear-stage suction port of the suction / discharge unit. The high heat generated up to the final compression space of the first-stage compression section is transferred to the fixed scroll also from the first-stage discharge port, and in particular, since the second-stage suction port is arranged alongside the first-stage discharge port, Heat is also transferred to the fixed scroll wrap in the rear compression section. Therefore, by arranging the heat insulating pipe in the front discharge port, heat transfer to the fixed scroll wrap of the rear compression unit can be suppressed.

The rear suction port of the suction / discharge section is for sucking a fluid cooled by a cooler or the like. However, since the rear suction port is arranged alongside the front discharge port, Heat is transferred from the non-insulated portion to the downstream suction port side, and the heat is transferred to the cooled fluid. Therefore, heat transfer to the cooled fluid can be suppressed by disposing the heat-insulating pipe in the rear-stage suction port.

The discharge port discharges the compressed fluid compressed by the second-stage compression section. The discharge port transfers heat to another wrap through an end plate on which a fixed scroll wrap is implanted. It is. Therefore, by arranging the heat insulating pipe in the discharge port, heat transfer to other wraps can be suppressed.

In the second aspect of the present invention, the inlet of the fixed scroll wrap groove on the side of the rear compression section communicating with the rear suction port q is formed to have a width smaller than the width of the fixed scroll wrap groove. The same function and effect as the first aspect of the invention can be obtained.

In the second aspect of the present invention, at the entrance of the fixed scroll wrap groove, a projection having a circular surface extending from the wall surface is disposed on one fixed scroll wrap wall surface forming the fixed scroll wrap groove. The same operational effect as the technical means in claim 2 can be obtained by providing the rear-stage compression section so that the orbiting scroll end of the rear-stage compression section comes into contact with the circular surface to take in the front-stage compressed fluid.

According to the second aspect of the present invention, the same operation and effect as the technical means in the third aspect can be obtained by arranging the projections on the wrap wall surfaces on both sides of the fixed scroll wrap groove.

In the second aspect of the present invention, the volume of the fluid intake space formed by the fixed scroll wrap and the orbiting scroll wrap on the pre-compressor section side is changed to the one wall side space and the other wall side space of the orbiting scroll wrap. And substantially the same as the one-side wall-side sealed space and the other-side wall-side closed space of the orbiting scroll wrap of the final closed space formed by the fixed scroll wrap and the orbiting scroll wrap on the rear compression section side. By forming them equally, the same operation and effect as the technical means in claim 4 can be obtained.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the invention thereto, but are merely illustrative examples unless otherwise specified. Not just.

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.
FIG. 5 is an explanatory view for explaining a fluid compression state when a fluid is taken in by the orbiting scroll wrap. FIG. 5 is an explanatory view for explaining a fluid compression state when the orbiting scroll wrap rotates from FIG. FIG. 7 is an explanatory view for explaining a compressed fluid intake operation of a subsequent compression section according to an embodiment of the present invention, FIG. 7 is a sectional view of a suction port and a discharge port of a compressed fluid, and FIG. It is a lineblock diagram showing the combination of the fixed scroll shown in FIG.

In FIG. 1, the multi-stage scroll fluid mechanism main body 1 includes 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 a discharge pipe 6 attached to a discharge port of a former compression section of a fixed scroll housing to be described later and a suction pipe 7 attached to a suction port of a latter compression section. The cooling chamber 24, the discharge pipe 6, and the suction pipe 7 are connected by a pipe to form an intermediate path.

The intermediate path has a total volume of a front-stage discharge hole 2e and a rear-stage suction hole 2f shown in FIG. 2 and a pipe passing through the cooling chamber 24 interposed therebetween. 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 first-stage compression section, the first-stage capture of the second-stage compression section is configured to be captured by a volume equal to the final compression chamber volume of the first-stage compression section.

However, during the initial operation, the scroll fluid machine is in a stopped state, and the final compression chamber of the subsequent compression section of the fluid compression space formed by the fixed scroll wrap and the orbiting scroll wrap has a discharge hole of the latter compression section. 2
d (FIG. 1), the fluid exists at a pressure equal to or lower than the external pressure, and the fluid that was in the initial intake space of the subsequent compression unit communicates with the intermediate path. May drop to pressure.

In this state, when the initial operation is started, the residual fluid in the subsequent compression section is compressed until it becomes higher than the external pressure. That is, when the pressure of the final compression chamber of the subsequent compression unit is combined with the compressed fluid of the compression chamber before it and becomes higher than the external pressure, it is discharged to the outside, but if it is still lower than the external pressure, it is discharged from the intermediate path. The fluid is taken in and is combined with the fluid on the discharge port side and compressed. Then, at the end of the initial operation, after the N times of discharge from the last compression chamber of the first-stage compression section, the first-stage intake of the second-stage compression section is taken in by a volume equal to the final compression chamber volume of the first-stage compression section. Operating state.

Now, the fixed scroll housing 2 is shown in FIG.
As shown in the figure, the drive shaft housing 3 and the coupling surface 2 are formed in a circular tray shape at three locations on the outer peripheral surface in the circumferential direction.
Mounting portions 2i, 2j, and 2k that are connected by m are provided, and a mirror surface 2c is provided in the concave portion. The mirror surface 2c communicates with a passage 2a provided inside the mounting portion 2i. A groove is provided on the coupling surface 2m outside the portion coupled with the drive shaft housing 3, and a groove is provided inside the groove, and a self-lubricating dust seal 12 made of a fluorine resin or the like is provided in the groove.

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. The fixed scroll wrap 9b that forms a front compression section in a counterclockwise direction from the land 9a where these holes are formed.
However, a fixed scroll wrap 9c that forms a rear compression section in a clockwise direction is spirally implanted. A groove is provided at the upper end of these wraps, and a chip seal 14 having a self-lubricating property such as a fluorine resin is fitted into the groove.

As shown in FIG. 1, cooling fins 2b are implanted on the rear 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 fins 2b to form a cooling passage 2n. ing. Therefore, FIG.
The fixed scroll can be cooled by cooling air flowing in a direction penetrating the paper surface of FIG. Further, a pipe 5 is attached so that fluid can be taken into the passage 2a.

The orbiting scroll 11 has a mirror surface 10c,
As shown in FIG. 1, the mirror surface 10c comes in contact with a dust seal 12 provided on the coupling surface of the fixed scroll housing 2, and is arranged facing the mirror surface 10c. 10a, and a revolving scroll wrap 10b that constitutes a rear compression section implanted on the center side. A groove is provided at the upper end of these wraps, and a chip seal 13 having a self-lubricating property such as a fluorine resin is fitted into the groove. These orbiting scroll wraps 10a and 10b are arranged such that the wall surfaces thereof face the fixed scroll wraps 9b and 9c.

On the back side of the mirror surface 10c, cooling fins 11a are implanted as shown in FIG.
The auxiliary cover 15 is attached to the top of the cooling passage 11a.
n. Therefore, the orbiting scroll can be cooled by the cooling air flowing in the direction penetrating the paper surface of FIG.

The auxiliary cover 15 is provided at its center with a bearing 18 to which a tip eccentric portion 16a of a rotary drive shaft 16 to be described later is rotatably fitted. A bearing 19 that receives a crank member for preventing rotation of the orbiting scroll is disposed at the location. This crank member has a shaft 22 fitted on one surface of the plate member 21 and the bearing bearing 19 and a second surface.
The shaft 22 is composed of a shaft 23 having an eccentric shaft position, and the shaft 23 is configured to be fitted and positioned with a bearing 20 provided on the drive shaft housing 3. Therefore, by the eccentric rotation of the tip eccentric portion 16a of the rotary drive shaft 16, the orbiting scroll 11 is configured to be able to revolve with respect to the fixed scroll.

The drive shaft housing 3 has an opening in a direction passing through the plane of FIG. 1, and is configured to be able to cool the fins 11a of the orbiting scroll by flowing cooling air. A rotary drive shaft 16 connected to a rotary shaft of a drive motor (not shown) by a central bearing 17.
Is rotatably held.

The scroll main body 1 constructed as described above
As shown in FIG. 1, the rotation of the rotation drive shaft 16
As the eccentric shaft portion 16a rotates about the shaft center 16b, the orbiting scroll 11 revolves, and as shown in FIG. 4, the compressed fluid sucked from the suction port 2a of the fixed scroll housing 9 becomes the wrap 10a of the orbiting scroll. And is taken in by the closed spaces S1 and T1 formed by this wrap and the fixed scroll wrap 9b. These working spaces are offset by 180 ° but at the same time are taken up by approximately equal volumes.

As shown in FIGS. 4 and 5, the closed space taken in as S1 in FIG.
→ S2 → S3 → S4, and then from S5 to the front outlet 2e
→ Intermediate route → Second stage suction port 2f → S6 → S7 → S8 → S9
The closed space taken in as T1 in FIG. 4 is compressed in order as T1 → T2 → T3, and from T4, the front-stage discharge port 2e → intermediate path → the rear-stage suction port 2f → T5 → T6 → T7.
→ T8 → T9 compressed and sent to the center, S9 and T9
Are merged and discharged from the pipe 8 through the discharge port 2d.
As shown in FIG. 4, since the sealed spaces S8 and T9 have the same volume, the fluid of the same pressure is discharged.

Next, a description will be given of the structure of the compressed fluid intake port of the subsequent compression section in the fluid compression process. FIG. 6 shows a first embodiment of the compressed fluid intake port structure of the rear compression section.
As shown in (a), between the suction port 2f of the rear compression unit and the tip 10c of the orbiting scroll 10b of the rear compression unit,
A projection 9e having a circumferential surface 9g protrudes from the inner wall surface of the fixed scroll wrap 9c.
0c is in contact with the circumferential surface 9g, and
It is configured to revolve on a.

Since the present embodiment is configured as described above, even when the spaces S5 and S6 are electrically connected, the orbiting scroll wrap 10 is engaged in the space T6.
The edge 30 of the front end 10c of the b is a fixed scroll wrap 9c.
Before turning to the position of the point P1 on the inner wall, the edge 30 and the circumferential surface 9g come into contact with each other to form an engaging space T6. Therefore, since the approach space T6 is formed before reaching the point P1, the intake of the compressed fluid from the intermediate path is not delayed and the overpressure is avoided.

Further, as a second embodiment of the compressed fluid intake port structure of the rear compression section, as shown in FIG.
When a projection 9f having a circumferential surface 9h on the outer wall surface of the fixed scroll wrap 9d protrudes between the suction port 2f of the rear compression section and the tip 10c of the orbiting scroll 10b of the rear compression section, Edge 31 of tip 10c of 10b
Is configured to revolve on the circumferential trajectory 31a in contact with the circumferential surface 2h.

Since the present embodiment is configured as described above, even when the spaces T4 and T5 are electrically connected, the orbiting scroll wrap 10 is engaged in the space S5.
The edge 31 of the front end 10c of the fixed scroll wrap 9d
Before turning to the position of point P2 on the outer wall, the edge 31 comes into contact with the circumferential surface 9h to form a working space S5. Therefore, the approach space S5 is formed before the point P2 is reached, so that the intake of the compressed fluid from the intermediate path is delayed and the overpressure is avoided.

By arranging the projections 9f and 9e, the amount of intake by the working space of the subsequent compression section can be taken in stably, and a stable compression ratio can be obtained.

In the above-described fluid compression process, high heat is generated by the compressed fluid in the final compression chamber of the former compression section. Therefore, as shown in FIG. 7, in order to reduce the amount of heat conducted by the high heat to the solid scroll wrap, a heat insulating pipe 25 made of resin is provided in the passage connected to the pipe 6 from the upstream discharge hole 2 e and the inside of the pipe 6. Is arranged. In addition, in order to reduce the amount of the cooling fluid from the cooling chamber 24 that is transferred from the base land 9a, a heat-insulating pipe 26 made of resin is disposed inside the suction port 2f of the second-stage compression section.
Also, high heat is generated by the compressed fluid in the final compression chamber of the subsequent compression section. Therefore, in order to reduce the amount of heat conducted by the high heat to the solid scroll wrap, a heat-insulating pipe 24 made of resin is disposed inside the pipe 8 and the passage extending from the latter discharge hole 2d to the pipe 8. With this configuration, the heat conduction of the high heat compression fluid is suppressed, and the scroll wrap is prevented from being deformed due to the thermal expansion of the fixed scroll member and coming into contact with the counterpart member.

Next, another embodiment of a multi-stage scroll fluid machine having a four-stage compression section will be described with reference to FIG.
In the figure, the fixed scroll 40 is provided with a number of wrap grooves in which the orbiting scroll wrap of the other party is arranged such that the wall surfaces thereof face each other. The lap groove is provided spirally from the outer peripheral side to the center side, and is provided with a first-stage discharge port 40a for discharging the compressed fluid compressed by the first-stage compression section;
A first lap groove 44 formed in a spiral shape from 0a to a first suction / discharge portion 41 having a second stage suction port 40b of a second stage compression portion for sucking a compressed fluid through an intermediate path (not shown). A second-stage discharge port 40c for discharging the compressed fluid compressed by the second-stage compression section, and a third-stage suction port of the third-stage compression section for sucking the compressed fluid from the discharge port 40c via an intermediate path (not shown). A second wrap groove 45 spirally formed between the second suction / discharge unit 42 provided with the second suction / discharge unit 40d and a third-stage discharge port 40e for discharging the compressed fluid compressed by the third-stage compression unit.
And a third suction / discharge unit 43 having a fourth-stage suction port 40f of a fourth-stage compression unit that sucks the compressed fluid from the discharge port 40e through an intermediate path (not shown). It comprises a third wrap groove 46 and a fourth wrap groove 47 formed spirally up to a discharge port 40g for discharging the compressed fluid compressed by the fourth-stage compression section.

On the other hand, the orbiting scroll wrap is
A first turning wrap 48 disposed in the lap groove 44, a second turning wrap 49 disposed in the second lap groove 45, a third turning wrap 50 disposed in the third lap groove 46, the fourth lap groove 47.

The four-stage compression scroll fluid machine configured as described above has the first orbiting wrap 48 disposed in the first wrap groove 44 formed outside and inside the fixed scroll.
The first orbiting wrap 48 compresses the fluid taken into the sealed space formed by the solid scroll wrap forming the first wrap groove 44 by the first orbiting wrap 48, and the first suction wrap 48 compresses the fluid.
In the discharge part 41, the compressed fluid discharged from the first-stage discharge port 40a to a cooler (not shown) is cooled, and is cooled by the second-stage suction port 40a.
From b, the second orbiting wrap 49 takes in the closed space formed by the solid scroll wrap forming the second wrap groove 45, and compresses the fluid to the second suction / discharge unit 42.

In the second suction / discharge section 42, the compressed fluid is discharged from the second-stage discharge port 40c to a cooler (not shown), and the cooled compressed fluid is discharged from the third-stage suction port 40d to the third turning wrap 50. The fluid is taken into a sealed space formed by the solid scroll wrap forming the third wrap groove 46, and the fluid is compressed to the third suction / discharge unit 43.

In the third suction / discharge section 43, the compressed fluid is discharged from the third-stage discharge port 40e to a cooler (not shown), and the cooled compressed fluid is discharged from the fourth-stage suction port 40f to the fourth turning wrap 51. The fluid is taken into the closed space formed by the solid scroll wrap forming the fourth wrap groove 47, and the fluid is discharged from the discharge port 40g.

The present embodiment is configured as described above, so that it is possible to provide a scroll fluid machine that suppresses the generation of high heat of the compressed fluid and has a high compression ratio.

In this embodiment, the case of two-stage compression and four-stage compression has been described. However, the present invention is not limited to this case. That is.

[0058]

As described above, according to the first aspect of the present invention, the inlet width of the fixed scroll wrap groove on the side of the latter compression section to which the first-stage compressed fluid is supplied is made smaller than the width of the fixed scroll wrap groove. As a result, the time during which the fluid intake end of the orbiting scroll wrap disposed in the fixed scroll wrap groove opens the inlet is shorter than when the entire width of the fixed scroll wrap groove is set as the inlet width, It is possible to provide a multi-stage compression scroll fluid machine that efficiently takes in the compressed fluid in the second-stage compression section without taking in excess fluid from the supply passage.

According to the second aspect of the present invention, heat transfer to the fixed scroll wrap of the rear compression section can be suppressed by disposing the heat insulating pipe in the front discharge port, the rear suction port, and the like. In addition, heat transfer to the cooled fluid can be suppressed by arranging the heat insulating pipe in the downstream suction port.

[Brief description of the 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 the orbiting scroll wrap.

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

FIG. 6 is an explanatory diagram illustrating a compressed fluid intake operation of a rear compression unit according to the embodiment of the present invention.

FIG. 7 is a sectional view of a discharge hole and a discharge hole of a compressed fluid.

FIG. 8 is a configuration diagram showing a combination of a fixed scroll and an orbiting scroll according to another embodiment.

FIG. 9 is an explanatory diagram (1) illustrating a compressed fluid intake operation of a rear compression unit according to the related art.

FIG. 10 is an explanatory view (2) for explaining a compressed fluid intake operation of a rear compression unit according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scroll fluid machine main body 2 Fixed scroll housing 3 Drive shaft housing 11 Orbiting scroll 24 Cooler 27, 28 Fixed scroll wrap groove 19 Inlet

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H029 AA02 AA09 AA17 AB01 BB11 BB43 CC23 3H039 AA02 AA14 BB12 BB28 CC02 CC03 CC05 CC26 CC28 CC29

Claims (9)

[Claims] 1. A scroll fluid machine provided with a multi-stage fluid compression section that cools a fluid compressed by a first-stage compression section and further compresses the fluid by a second-stage compression section, wherein a supply passage communicating with the first-stage compression section is provided. A scroll fluid having a multi-stage fluid compression part, wherein an inlet width of the fixed scroll wrap groove on the side of the rear compression part to which the front compression fluid is supplied is formed to be narrower than a width of the fixed scroll wrap groove. machine. 2. A projection having a circular surface extending from the wall surface of the fixed scroll wrap groove is provided at an entrance of the fixed scroll wrap groove on a wall surface of the fixed scroll wrap on one side forming the fixed scroll wrap groove. 2. The scroll fluid machine according to claim 1, wherein the orbiting scroll end of the portion contacts the circular surface to take in the pre-stage compressed fluid. 3. The scroll fluid machine according to claim 2, wherein the projections are disposed on wrap wall surfaces on both sides of the fixed scroll wrap groove. 4. The intake volume of the fluid intake space on the pre-compression unit side formed by the fixed scroll wrap and the orbiting scroll wrap is substantially equal between the one wall side space and the other wall side space of the orbiting scroll wrap. In addition, the closed space on one wall side and the closed space on the other wall side of the orbiting scroll wrap of the final closed space on the side of the rear compression section formed by the fixed scroll wrap and the orbiting scroll wrap are substantially equal to each other. Claim 1
A scroll fluid machine comprising the multi-stage fluid compression section according to any one of the preceding claims. 5. A scroll fluid machine provided with a multi-stage fluid compression section for cooling a fluid compressed by a first-stage compression section and further compressing the fluid by a second-stage compression section. The spiral groove is provided spirally from the outer peripheral side of the fixed scroll toward the discharge hole on the center side, and the wrap groove is formed between the outer peripheral side and the discharge hole by the compressed fluid compressed by the pre-compression unit. And a suction / discharge unit provided with a rear suction port for receiving a compressed fluid from the front discharge port via an intermediate path from the front discharge port, the center discharge hole, the front discharge port being provided. A scroll fluid machine having a multi-stage fluid compression section, wherein a heat-insulating pipe is arranged at least in the front-stage discharge port of the rear-stage suction port. 6. The multi-stage according to claim 5, wherein the inlet of the fixed scroll wrap groove on the side of the rear compression section communicating with the rear suction port is formed to have a width smaller than the width of the fixed scroll wrap groove. Scroll fluid machine provided with a fluid compression unit. 7. At the entrance of the fixed scroll wrap groove, a projection having a circular surface extending from the wall surface is disposed on one fixed scroll wrap wall surface forming the fixed scroll wrap groove. 7. The scroll fluid machine according to claim 6, wherein the orbiting scroll end of the portion contacts the circular surface to take in the pre-stage fluid. 8. The scroll fluid machine according to claim 7, wherein said projections are disposed on wrap wall surfaces on both sides of said fixed scroll wrap groove. 9. The intake volume of the fluid intake space on the pre-compressor section formed by the fixed scroll wrap and the orbiting scroll wrap is substantially equal between the one wall side space and the other wall side space of the orbiting scroll wrap. In addition, the first closed space formed by the fixed scroll wrap and the orbiting scroll wrap and the final sealed space on the side of the second-stage compression section are formed so that the closed space on one wall side and the closed space on the other wall side of the orbiting scroll wrap are substantially equal. Claim 5
A scroll fluid machine comprising the multi-stage fluid compression section according to any one of the preceding claims.