JP2002138976A - Scroll type fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide scroll type fluid machinery provided with a cooling means capable of efficiently cooling a scroll mechanism. SOLUTION: In this scroll type fluid machinery passing cooling fluid from one side to the other side along the direction of extension of end plates of a turning scroll 11 and a fixed scroll 2 and provided with the cooling means for cooling the scroll mechanism, a bearing of a crankshaft for preventing rotation for rotating and driving the turning scroll 11 is provided, and an injection port is provided for injecting cooling gas toward the bearing in at least the vicinity of the bearing on one side among the bearings of a drive shaft for driving the turning scroll.

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 cooling fluid from one side to the other along the extending direction of an orbiting scroll and a fixed scroll end plate. The present invention relates to a scroll fluid machine provided with cooling means for circulating and cooling a scroll mechanism.

[0002]

2. Description of the Related Art Conventionally, in a scroll fluid machine, in order to generate high heat, orbiting scrolls and solid scrolls are usually cooled by a cooling wind or a cooling fluid to cool the high heat generated by compressing the fluid. 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 type scroll fluid machine is controlled to a temperature that the scroll fluid mechanism can withstand in the compression up to the previous stage, and after cooling down to the compression fluid discharge temperature in the previous stage in the latter stage, the desired compression ratio can be obtained without becoming higher than usual. Can be obtained.

[0005] However, if the temperatures of the compressed fluid discharge port side of the first-stage compression section and the compressed fluid discharge port side of the second-stage compression section can be efficiently cooled, the compression ratio can be further increased. This efficient cooling is not only a problem on the discharge port side, but also on the bearing side of the crankshaft that prevents the orbiting scroll from rotating. This is required not only for the multi-stage compression scroll fluid machine but also for the one-stage compression scroll fluid machine.

[0006]

In the conventional cooling structure, a fan for taking in an external gas is provided on a drive shaft directly connected to a motor for orbiting the orbiting scroll, and the cooling gas taken from the fan is fed forward from the side of the main body. To the scroll mechanism by a cooling duct, and sends cooling gas along the direction of extension of the scroll end plate to cool the scroll members, that is, the orbiting scroll end plate, the fixed scroll end plate, the drive bearing of the orbiting scroll, and the crank bearing. Was.

However, although the conventional cooling structure has a simple structure, the motor for orbiting the orbiting scroll is operated at a predetermined rotation speed and the flow rate of the cooling gas is constant. Although the cooling gas temperature is low on the inlet side, it becomes higher as it goes inside.
Therefore, the crankshaft located closer to the outlet side than the inlet side of the cooling gas is less likely to be cooled.

Therefore, the bearing of the crankshaft near the inlet side is most easily cooled, the orbiting scroll bearing is secondarily cooled most easily, and the bearing of the crankshaft near the outlet side is hardly cooled. It is the drive shaft side of the orbiting scroll that generates the highest heat of the compressed fluid. For example, as shown in FIG. Near the entrance, the crank bearing 90A and the drive bearing 18 are closer to the center than the entrance, and the crank bearing 90C is located on the exit side. Therefore, the cooling capacity of the drive bearing 18 is reduced due to the hindrance of the crank bearing 90B.

If the cooling gas flows from the direction of the arrow 101, the cooling capacity of the drive bearing 18 will be improved, but the crank bearing 90C is obstructed by the drive bearing 18 and the cooling efficiency is reduced. In any case, even if the drive bearing 18 is sufficiently cooled, the crank bearing 9
At 0C, the cooling efficiency decreases, the grease inside the bearing deteriorates,
The durability decreases.

Increasing the flow rate of the cooling gas means increasing the size of the cooling fan or increasing the number of revolutions of the motor. Therefore, the load fluctuates greatly and a load is applied to the motor. In spite of the burden on the motor, the problem that the cooling gas to the scroll mechanism is low at the inlet side and high at the outlet side cannot be solved.

In view of the above circumstances, an object of the present invention is to provide a scroll fluid machine having a cooling means for efficiently cooling a scroll mechanism. Another object of the present invention is to provide a scroll fluid machine including a cooling means for efficiently cooling each bearing of the scroll mechanism. It is another object of the present invention to provide a scroll fluid machine provided with a cooling means for efficiently cooling at least a bearing portion of a crankshaft.

[0012]

A first aspect of the present invention relates to a scroll fluid machine which cools a scroll mechanism by flowing a cooling gas from one side to the other along the extending direction of an orbiting scroll and a fixed scroll end plate. Injecting a cooling gas toward at least one of the bearings of the crankshaft for preventing rotation for driving the orbiting scroll to revolve or the bearings of the drive shaft for driving the orbiting scroll. It is characterized by having an injection port.

Normally, two or three rotation preventing crankshafts are arranged at equal angular intervals in the outer circumferential direction of the scroll. When the gas for cooling the scroll mechanism is allowed to flow from the X-axis direction, two rotation-preventing crankshafts are arranged in the Y-axis direction perpendicular to the X-axis, and the drive shaft of the orbiting scroll is provided in the middle. If they are arranged, it is possible to expect the same cooling capacity for all three shafts. However,
Even in this case, when a cooling gas is circulated to the drive shaft portion of the orbiting scroll so as to increase the cooling power, the cooling capacity of the rotation preventing crankshaft on the outer peripheral side is reduced.

When three or more anti-rotation crankshafts are provided, the cooling capacity of the scroll mechanism at the inlet side and the outlet side of the cooling gas decreases at the outlet side due to the temperature difference of the cooling fluid. Therefore, by providing a cooling gas injection port near the bearing of the rotation preventing crankshaft, a cooling gas suitable for the crankshaft bearing can be injected. And since the said injection port is arrange | positioned near the bearing of the crankshaft for rotation prevention, until the said cooling gas reaches this injection port, it is influenced by another high-temperature body and it is hard to be heated. Therefore, efficient cooling of the scroll machine can be performed.

[0015] The cooling gas for cooling the bearing is:
Diversion of a part of the cooling gas for cooling the scroll mechanism is also an effective means of the present invention. In such a case, there is provided a gas circulation duct that incorporates a gas intake fan and allows gas from the gas intake fan to flow through the scroll mechanism, and from the middle of the gas circulation duct to the injection port of the crankshaft bearing. It is desirable that the communicating tubular bodies be branched.

According to such technical means, the crankshaft bearing can be cooled with a simple structure. In this case, it is desirable that the tubular body uses a heat insulating material to prevent heat exchange with the outside.

It is also an effective means of the first invention that the tubular body is configured to have a smaller gas flow cross section than the gas flow duct. According to such technical means, the cooling gas in the tubular body is pressed by the cooling gas pressure by the gas flow duct having a wide cross-sectional area, and the cooling gas is injected at the injection port near the crankshaft bearing. Since the cooling gas collides and is replaced with a new cooling gas, the cooling efficiency is improved.

It is also an effective means of the present invention that the cooling gas is constituted by using a part of the compressed gas discharged from the scroll fluid machine main body. Since it is only necessary to draw in from a storage means such as an air tank used through an electromagnetic valve or the like,
Cooling means for each bearing part can be realized with a simple configuration.

It is also an effective means of the present invention that cooled gas is injected from the injection port to the crankshaft bearing and the drive shaft bearing, respectively. Can be improved.

It is also an effective means of the present invention that the cooled gas has a pressure higher than the atmospheric pressure. According to the technical means, the cooled gas having a pressure higher than the atmospheric pressure is applied to each gas. Since the gas is injected into the bearing, the injected gas expands, the temperature is further reduced, and the cooling efficiency can be further improved.

[0021]

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 front view, partially in section, of a scroll fluid machine according to a first embodiment of the present invention.
FIG. 2 is a plan view showing a partial cross section of FIG. 1, and FIG.
FIG. 4 is a partially sectional front view of a scroll fluid machine according to a second embodiment of the present invention, FIG. 4 is a partially sectional plan view of FIG. 3, and FIG. -A sectional view,
FIG. 6 is a diagram illustrating a bearing cooling air generator according to a second embodiment, FIG. 7 is a diagram illustrating another bearing cooling air generator according to the second embodiment, and FIG. 8 is a first embodiment. FIG. 9 is a cross-sectional view of the scroll fluid machine used in the embodiment and the second embodiment.
FIG. 10 is an explanatory diagram illustrating a fluid compression state when fluid is taken in from one side wall surface of the orbiting scroll wrap, and FIG. 10 is an explanatory diagram illustrating a fluid compression state when fluid is taken in from the other side wall surface of the orbiting scroll wrap. is there.

The operation of the scroll fluid machine used in the first embodiment in FIG. 1 and the second embodiment in FIG. 3 will be described with reference to FIG. 8, the multi-stage scroll fluid machine 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. Then, a discharge pipe 6 attached to a discharge port of a front-stage compression section of a fixed scroll housing to be described later.
A cooling chamber 24 is provided between the suction chamber 7 and the suction pipe 7 attached to the suction port of the rear compression section, and the cooling chamber 24, the discharge pipe 6, and the suction pipe 7 are connected by a pipe to form an intermediate path. are doing.

The intermediate passage has a total volume of a front discharge port 2e and a rear suction port 2f shown in FIG. 9 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 at a standstill, and the final compression chamber of the rear compression section of the fluid compression space formed by the fixed scroll wrap and the orbiting scroll wrap has a discharge port of the rear compression section. 2
d (FIG. 8), the fluid exists at a pressure equal to or lower than the external pressure, and the fluid 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.

The fixed scroll housing 2 is formed in the shape of a circular tray, and mounting portions are provided at three locations on the outer circumferential surface in the circumferential direction to be connected to a drive shaft housing 3 to be described later at a connecting surface 2m. 2c, the mirror surface 2
c is in communication with a passage 2a provided inside the mounting portion. 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. 9 and 10) connected to the discharge pipe 6 shown in FIG. 8, and a rear-stage suction port 2f (FIGS. 9 and 10) connected to the suction pipe 7. The fixed scroll wrap 9 which forms the front compression section in the counterclockwise direction from the land 9a where these holes are formed.
b, a fixed scroll wrap 9c forming a rear compression section in a clockwise direction is spirally implanted. And
A groove is provided at the top 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. 8, a cooling fin 2b is 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 fin 2b to form a cooling passage 2n. ing. Therefore, the fixed scroll can be cooled by cooling air flowing from a fan, which will be described later, in a direction penetrating the plane 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 11c,
As shown in FIG. 8, the mirror surface 11c comes in contact with the dust seal 12 provided on the coupling surface of the fixed scroll housing 2, and is disposed facing the dust seal 12. As shown in FIGS.
1c has a revolving scroll wrap 10a that constitutes a front compression portion implanted on the outside and a revolving scroll wrap 10b that constitutes a rear compression portion 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 11c, 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, FIG.
The orbiting scroll is configured to be able to be cooled by cooling air flowing in a direction penetrating the paper surface of FIG.

The auxiliary cover 15 has a drive bearing 18 on the center side of 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 an equally divided portion. This crank member is constituted by a shaft 22 fitted on one surface of the plate member 21 with the bearing 19 and a shaft 23 having an eccentric shaft position on the other surface. The drive shaft housing 3 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 penetrating the paper surface of FIG. 8, and the bearing 18 of the rotary drive shaft 16 disposed on the cooling fin 11 a of the orbiting scroll and the auxiliary cover 15 by the flowing cooling air. Further, the bearing 19 that receives the crank member for preventing rotation of the orbiting scroll can be cooled. A rotary drive shaft 16 connected to a rotary shaft of a drive motor (not shown) is rotatably held by a bearing 17 at the center.

As shown in FIG. 8, the orbiting scroll 11 of the main body 1 of the scroll fluid machine constructed as described above is rotated by the rotation of the rotary drive shaft 16 so that the eccentric portion 16a rotates about the shaft center 16b. As shown in FIG. 9, the compressed fluid revolved and drawn in from the passage 2a of the fixed scroll housing 9 is taken in by the wrap 10a of the orbiting scroll, and the sealed space S1 and the closed space S1 formed by the wrap and the wrap 9b of the fixed scroll are formed. Captured by T1. These working spaces are displaced by 180 ° but at the same time are taken up by approximately equal volumes.

As shown in FIGS. 9 and 10, 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
Further, the sealed space taken in as T1 in FIG. 9 is sequentially compressed as T1 → T2 → T3, and from T4, the front discharge port 2e → the intermediate path → the rear 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. 9, since the sealed spaces S8 and T9 have the same volume, fluids of the same pressure are discharged.

A cooling chamber 24 is provided in the intermediate passage, and the high-temperature, high-pressure fluid discharged to the upstream discharge port 2e is cooled to about the fluid temperature in the upstream passage 2a in the cooling chamber 24, and is connected to the downstream suction port. From 2f, it is taken into the subsequent compression section. Then, the fluid is further compressed by the rear compression unit to a temperature approximately equal to the temperature of the compressed fluid at the discharge port 2e of the front compression unit, and is discharged from the discharge port 2d. Therefore, since the compressed fluid is cooled in the intermediate passage, even if the compression ratio is set to a high compression ratio, the tip seal, the bearing member, and the like are prevented from being exposed to a high temperature and the durability is reduced.

Next, a first embodiment of a cooling structure for a scroll fluid machine body will be described with reference to FIGS. The rotating shaft 16 described in FIG. 8 is connected to a motor (not shown) on the right side of FIG. A fan receiver 43 is fixed to a portion 16c of the rotating shaft 16, and the fan receiver 43 is
Is fitted with a fan 42.

The fan 42 is disposed in the outer frames 41 and 40A, and the outer frame 40A is connected to the outer frame 41 and extends to one side of the scroll fluid machine body to form a cooling air flow passage. . The fan 42 is rotated by a motor (not shown), and as shown in FIG.
As shown by an arrow 60, gas is taken in from the outside of the scroll fluid machine into the fan 42 and discharged from the outside of the fan 42 from between 0 Aa and the outer peripheral surface 3 d of the drive shaft housing 3.

The cooling air discharged from the fan 42 as indicated by an arrow 61 flows as indicated by an arrow 62, collides with the projection 40Ab, is changed in direction as indicated by an arrow 64, and is turned.
The cooling fins 11a, the drive bearings 18, etc. are cooled. Further, since a large number of the protrusions 40Ab are provided in a comb-teeth shape in a direction perpendicular to the paper surface of FIG.
3, the cooling air flows, and the fixed scroll fins 2b
(FIG. 8) to cool the fixed scroll.

On the other hand, the cooling air as shown by the arrow 61 enters the passage 44 on the way as shown by the arrow 65 and cools the crank bearings 19 and 20 as shown by arrows 66 to 67 (FIG. 1).
In FIGS. 1 and 2, the crankshaft bearing 19 is disclosed in one place.
There are two places. The passage 44 is formed in the outer frame 40.
Three are arranged from A to each crankshaft.

In the first embodiment, an external gas is taken in, and respective cooling air circulation passages are formed toward respective portions such as a fixed scroll, an orbiting scroll, a drive bearing, and a crankshaft. Since the part is cooled,
Each part can be efficiently cooled during operation of the scroll fluid machine. In the first embodiment, the cooling air is sent using the fan 42. However, instead of the fan 42, a fan may be disposed on the side that emits the cooling air after cooling as an arrow 68. Good.

Next, a second embodiment of the cooling structure of the main body of the scroll fluid machine will be described with reference to FIGS. 3, 4, and 5. FIG. The rotary drive shaft 16 described with reference to FIG. 8 is connected to a motor (not shown) on the right side of FIG. A fan receiver 43 is fixed to a part 16c of the rotary drive shaft 16, and a fan 42 is attached to the fan receiver 43.

The fan 42 is arranged in the outer frames 41 and 40B, and the outer frame 40B is connected to the outer frame 41 and extends to one side of the scroll fluid machine body to form a cooling air flow passage. . The fan 42 is rotated by a motor (not shown), and blows gas from the outside of the scroll fluid machine to the inside of the fan 42 as shown by an arrow 70 from between the circular surface 40Ba of the outer frame 40B and the outer peripheral surface 3d of the drive shaft housing 3. The air is discharged outside the intake fan 42.

The cooling air discharged from the fan 42 as indicated by an arrow 71 flows as indicated by an arrow 72, collides with the projection 40Bb, is changed in direction as indicated by an arrow 74, and is turned.
Is cooled. The protrusion 40B
Since a large number of b are arranged in a comb shape in a direction perpendicular to the paper surface of FIG. 4, cooling air flows in the middle portion of the comb teeth as shown by an arrow 73 to cool the cooling fins 2b (FIG. 8) of the fixed scroll. The fixed scroll is cooled and the cooling air 82 (A, B)
Is discharged as

On the other hand, as shown in FIGS. 4 and 5, pipes 45 and 46 through which a cooling air described later flows are provided, and the pipe 45 is provided with cooling air 78 (A, B). Means that cooling air 75 (A, B) flows in and cooling air 78 (A, B)
Cools the crank bearings 19 and 20 and generates cooling air 75
(A, B) is configured to cool the drive bearing 18. Here, the sign of (A, B) of the cooling air indicates the distinction according to the generation source of the cooling air described later.

In FIG. 5, the bearing 19 of the crankshaft
Although three locations are disclosed, three locations are provided at 120 ° in the outer circumferential direction of the scroll. Then, three pipes 45 are provided from a cooling air generation source described later toward each crankshaft. The cooling air in the pipe 45 is supplied by an arrow 78 (A,
B), and the arrows 79 (A, B) and 80
It flows as (A, B), cools the crank bearing, and is discharged as the cooling air 81 (A, B) together with the cooling air 74 that has cooled the cooling fins 11 a (FIG. 8) of the orbiting scroll.

The cooling air flowing through the pipe 46 is supplied by an arrow 75 (A,
B), and flows as indicated by arrows 76 (A, B) and arrow 77
(A, B), the cooling air 7 which cools the crank bearing and cools the orbiting scroll fins 11 (FIG. 8).
4 and the cooling air that has cooled the crank bearing, and is discharged as cooling air 81 (A, B).

In the second embodiment, since the fixed scroll and the orbiting scroll are taken in by taking in the external gas and the cooling of the drive bearing, the crankshaft and the like are respectively formed by special cooling passages, Since each part is cooled in one way, each part can be efficiently cooled while the scroll fluid machine is operating. In particular, a different cooling gas from the external gas, for example, a dry cooling gas or a low-temperature cooling gas can be used in the cooling passage, and the cooling efficiency is further improved. In the first embodiment, the cooling air is sent using the fan 42.
A fan may be arranged on the side that emits as 8.

Next, a cooling air source for bearings will be described with reference to FIGS. FIG. 6 is a diagram illustrating a bearing cooling air generator according to a second embodiment. 8, a compressed fluid discharging pipe 8 of the scroll fluid machine main body disclosed in FIG. 8 is provided with an air tank 49 via a check valve 56, an aftercooler 47, and a dryer 48.

The air tank 49 is provided with a pipe 49a for sending compressed air to the main line and a pipe 49b for sending compressed air to the scroll fluid machine main body. Piping 4
An electromagnetic valve 50 is provided at 9b, and is configured to open in synchronization with the start of driving of the scroll fluid machine main body and close in synchronization with the stop. The solenoid valve 50 is connected to the pipe 45 and the pipe 46 on the downstream side,
The flow controllers 51 and 52 are provided in the pipe 46.

When the pressure of the discharge pipe 8 of the scroll fluid machine exceeds a predetermined value, the check valve 56 opens and the after-cooler 47 cools down the cooling air generator for bearings. It is dried by 48 and stored in an air tank 49. A pressure gauge (not shown) is disposed in the air tank 49, and when the pressure in the air tank reaches a predetermined value, for example, a pressure of 0.8 MPa, the driving of the scroll fluid machine main body is stopped.

The solenoid valve 50 is opened in synchronization with the driving of the scroll fluid machine main body, and compressed air is supplied to the pipes 45 and 46. These compressed air cools the crankshaft and the drive shaft. This cooling air generator for bearings cools the compressed fluid discharged from the fluid machine main body, accommodates the compressed fluid at a pressure higher than the atmospheric pressure, and releases the compressed gas at the time of bearing cooling to the atmospheric pressure to expand and use the compressed gas. The bearing can be cooled by the cooled gas, and the cooling efficiency is improved.

FIG. 7 is a view showing another cooling air generator for bearings according to the second embodiment. 8, a pipe 8 for discharging the compressed fluid of the scroll fluid machine body disclosed in FIG.
Is a check valve 56, an aftercooler 47, a dryer 48
, An air tank 49 is provided. The air tank 49 is a pipe 4 for sending compressed air to the main line.
9a is provided. Further, a cooling blower 57 for sending low-temperature cooling air is provided, and the cooling blower 57 is configured to be driven in synchronization with the start of driving of the school fluid machine body and stopped in synchronization with the stop. I have. The cooling blower 57 is connected to the pipe 45 and the pipe 46.

When the pressure of the discharge pipe 8 of the scroll fluid machine exceeds a predetermined value, the check valve 56 is opened and the after-cooler 47 cools the cooling air generator for bearings configured as described above. It is dried by 48 and stored in an air tank 49. A pressure gauge (not shown) is disposed in the air tank 49, and when the pressure in the air tank reaches a predetermined value, for example, a pressure of 0.8 MPa, the driving of the scroll fluid machine main body is stopped.

The cooling blower 57 is driven in synchronization with the driving of the scroll fluid machine main body, and the cooling air is supplied to the pipes 45 and 46. These cooling air cools the crankshaft and the drive shaft. This cooling air generator for bearings can supply cooling air from a cooling blower at the time of cooling of the bearing, and can cool the bearing with the cooled gas, thereby improving the cooling efficiency.

[0056]

As described above, according to the present invention, at least one of a bearing of a rotation preventing crankshaft for revolving the orbiting scroll and a bearing of a drive shaft for driving the orbiting scroll is provided. By providing an injection port for injecting a cooling gas toward the bearing near the bearing, it is possible to inject a cooling gas suitable for the bearing,
Efficient cooling of the scroll machine can be performed.

Since the drive shaft bearing and the crankshaft bearing have cooling gas injection ports arranged near the respective bearings, the cooling gas does not reach the injection ports until the cooling gas reaches the injection ports. Is less affected by high-temperature bodies. And so on.

[Brief description of the drawings]

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

FIG. 2 is a plan view, partially in section, of FIG. 1;

FIG. 3 is a front view showing a scroll fluid machine according to a second embodiment of the present invention in a partial cross section.

FIG. 4 is a plan view, partially in section, of FIG. 3;

FIG. 5 is a sectional view taken along line AA of FIG. 3;

FIG. 6 is a diagram illustrating a bearing cooling air generator according to a second embodiment.

FIG. 7 is a view showing another cooling air generator for bearings according to the second embodiment.

FIG. 8 is a sectional view of a scroll fluid machine used in the first embodiment and the second embodiment.

FIG. 9 is an explanatory diagram illustrating a fluid compression state when fluid is taken in from one side wall surface of the orbiting scroll wrap.

FIG. 10 is an explanatory diagram illustrating a fluid compression state when fluid is taken in from the other side wall surface of the orbiting scroll wrap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scroll fluid machine main body 2 Fixed scroll housing (fixed scroll) 3 Drive shaft housing 11 Orbiting scroll 24 Cooling chamber 44 Passage

Claims (7)

[Claims] 1. A scroll fluid machine that cools a scroll mechanism by flowing a cooling gas from one side to the other along an extending direction of an orbiting scroll and a fixed scroll end plate, wherein the orbiting scroll revolves. An injection port for injecting cooling gas toward the bearing is provided near at least one of the bearings of the crankshaft for preventing rotation or the bearings of the drive shaft for driving the orbiting scroll. Scroll fluid machinery. 2. The scroll fluid machine according to claim 1, wherein a part of the cooling gas for cooling the scroll mechanism is used as the cooling gas for cooling the bearing. 3. A gas flow duct, which has a built-in fluid intake fan and allows gas from the fluid intake fan to flow through the scroll mechanism, and wherein the injection port of the crankshaft bearing is provided at a midpoint of the fluid flow duct. 3. The scroll fluid machine according to claim 2, wherein a tubular body communicating with the scroll member is branched. 4. The gas turbine according to claim 3, wherein the tubular body has a smaller gas flow section than the gas flow duct.
The scroll fluid machine of any of the preceding claims. 5. The scroll fluid machine according to claim 1, wherein a part of the compressed gas discharged from the scroll fluid machine body is used as the cooling gas. 6. The scroll fluid machine according to claim 1, wherein cooled gas is respectively injected from said injection port to said crankshaft bearing and said drive shaft bearing. 7. The scroll fluid machine according to claim 5, wherein the cooled gas has a pressure higher than the atmospheric pressure.