JPH06100186B2 - Scroll type fluid device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid device used for a compressor of a refrigeration system, and more particularly to an oil return mechanism for lubricating oil or the like.

(Prior Art) Generally, a scroll type fluid device is disclosed in JP-A-60-73080.
As disclosed in the publication, a fixed scroll and a revolution scroll are housed in a hermetically sealed casing by meshing wraps with each other, and a crankshaft is eccentrically connected to the rear face of the revolution scroll while the casing is connected to the casing. In some cases, the interior is divided into a high pressure chamber above the fixed scroll and a low pressure chamber below. Then, by the rotation of the crankshaft, the revolution scroll revolves with respect to the fixed scroll without rotating, and the fluid introduced into the low pressure chamber is compressed between both scrolls and discharged through the high pressure chamber. There is.

(Problems to be Solved by the Invention) In the scroll fluid device described above, the lubricating oil that lubricates the bearings of the crankshaft is mixed with the low-pressure fluid, and this lubricating oil is discharged from the fixed scroll together with the high-pressure fluid. It will accumulate in the high pressure chamber. Therefore, a small-diameter oil return passage is formed from the high pressure chamber to the low pressure chamber to return the lubricating oil to the low pressure chamber.

However, in recent years, the motor that rotates the crankshaft is controlled by an inverter to variably control the rotation speed, and the discharge amount of the high-pressure fluid changes. Therefore, if a constant amount of oil is always returned in one oil return passage as in the conventional case, a large amount of lubricating oil will be stored in the high pressure chamber at high speed rotation, and there is a risk of oil shortage. There was a problem of low reliability. If the oil return passage is formed to have a large diameter for high speed rotation, the high pressure fluid will flow back into the low pressure chamber during low speed rotation, resulting in a reduction in compression efficiency.

The present invention has been made in view of such a point, and paying attention to the fact that a change in the amount of oil discharged to the high-pressure chamber corresponds to a change in the amount of discharge of the high-pressure fluid. By changing the opening area of the oil return passage, it is possible to reliably prevent oil shortage without lowering the compression efficiency.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the means taken by the invention according to claim (1) is, as shown in FIGS. 1 and 2, end plates (11), ( A fixed scroll (7), in which wraps (13) and (14) are erected on the front surface of 12) and an orbiting scroll (8), are arranged side by side with the respective wraps (13) and (14) meshing with each other. And the end plate (11) of the fixed scroll (7) having the discharge port (20) formed in the end plate (11) of the fixed scroll (7) so that the end plate (11) of the fixed scroll (7) inside the casing (2). The rear side is formed in the high pressure chamber (2a), and the orbiting scroll (8) is fixed to the fixed scroll (7).
On the other hand, it is premised on a scroll type fluid device which is revolved without rotating on its axis.

Then, a cover body (43) is attached to the rear surface of the end plate (11) of the fixed scroll (7) so as to cover the discharge port (20),
High pressure fluid is applied to the side surface of the cover body (43).
An outflow pipe (44) for guiding and outflowing from the inside to the outside in the circumferential direction is provided. Further, an oil return passageway (45) is formed on the rear surface of the end plate (11) of the fixed scroll (7) to return the oil flowing out to the high pressure chamber (2a) to the oil sump (41) at the bottom of the casing (2). At the same time, the pressure receiving plate (47) which is displaced by receiving the fluid pressure of the high pressure fluid flowing out from the outflow pipe (44) is the end plate (11) of the fixed scroll (7).
It is provided in. In addition, the pressure receiving plate (47) is connected to an opening adjusting means (48) for increasing the opening area of the oil return passage (45) as the fluid pressure increases.

Further, the means taken by the invention according to claim (2) is that in the invention according to claim (1), the pressure receiving plate (47) is attached to the support portion (47b) of the opening degree adjusting means (48). ) Is bent in an L-shape and is rotatably supported by the bending portion, while the opening adjustment means (48) has a needle valve (48a) facing the oil return passage (45). Support part (47b) of pressure plate (47)
And a spring (48b) for urging the needle valve (48a) in the valve closing direction is provided between the pressure receiving plate (47) and the fixed scroll (7).

Further, the means taken by the invention according to claim (3) is, as shown in FIG. 4, in the invention according to claim (1), the pressure receiving plate (47) is the end plate (11) of the fixed scroll (7). The pressure receiving portion (47c) is erected on the slide portion (47d) that slides up, while the opening degree adjusting means (48) has the needle valve (48c) facing the oil return passageway (45a). The spring (48d) is connected to the (47) and the spring (48d) for biasing the needle valve (48c) in the valve closing direction is provided between the pressure receiving plate (47) and the fixed scroll (7). .

Further, the means taken by the invention according to claim (4) is, as shown in FIG. 5, in the invention according to claim (1), the oil return passageway (45b) is an end plate (11) of the fixed scroll (7). A plurality of small holes (45c), (45c), ... Opening on the back surface are arranged side by side, while the opening adjusting means (48) is provided with the small holes (45c).
An adjusting plate (48e) for adjusting the numerical apertures of c), (45c), ... Is provided slidably on the end plate (11) of the fixed scroll (7), and the adjusting plate (48e) and the fixed scroll (7). And a spring (48f) for urging the adjusting plate (48e) in the valve closing direction are provided between the adjusting plate (48e) and the adjusting plate (4
The pressure receiving plate (47e) is erected on 8e).

Further, the means taken by the invention according to claim (5) is, as shown in FIG. 6, in the invention according to claim (1), the opening adjusting means (48) includes one oil return passage (45d). ) Is provided slidably on the end plate (11) of the fixed scroll (7), and the adjustment plate (48e) is provided between the adjustment plate (48e) and the fixed scroll (7). 48e)
Is provided with a spring (48f) for urging the valve in the valve closing direction, and a pressure receiving plate (47e) is erected on the adjusting plate (48e).

(Operation) With the above configuration, in the present invention, when the orbiting scroll (8) is revolved with respect to the fixed scroll (7) without rotating, the wraps (14), (7) of both scrolls (8), (7)
The fluid will flow in between (13) and be compressed.

Then, this high-pressure fluid is discharged from the discharge port (20) of the fixed scroll (7) into the cover body (43), and the outflow pipe (44).
Out into the high pressure chamber (2a) outside the cover body (43), and at that time, the outflow pipe (44) causes the high pressure fluid to swirl, and the swirling causes the lubricating oil in the high pressure fluid to be centrifugally separated. ,
It is stored in the high pressure chamber (2a).

On the other hand, the high-pressure fluid flowing out from one of the outflow pipes (44) collides with the pressure receiving plate (47), and the pressure receiving plate (47) is displaced. For example, in the invention of claim (2), the high pressure fluid rotates. Claim (3)-
In the invention of (5), it slides, and in particular, when the revolution speed of the revolution scroll (8) changes, the discharge amount of the fluid changes, and the displacement amount of the pressure receiving plate (47) changes with the dynamic pressure change of the fluid. Change. The opening adjusting means (48) adjusts the opening area of the oil return passage (45) by the displacement of the pressure receiving plate (47). For example, in the inventions of claims (2) and (3), the needle valve ( 48a) and (48c) change the opening amount, the invention of claim (4) changes the number of openings of the small holes (45c), and the invention of claim (5) slides the adjusting plate (48e). Changes the opening area. Then, as the discharge amount of the high-pressure fluid increases, the opening area increases, and a large amount of lubricating oil returns to the oil sump (41).

(Effect of the Invention) Therefore, according to the scroll type fluid device of the present invention, the high pressure chamber (2a) is provided with the pressure receiving plate (47) for receiving the dynamic pressure of the high pressure fluid, and is linked to the pressure receiving plate (47). Oil return passage (45)
When the revolution scroll (8) rotates at a high speed because the opening adjusting means (48) is provided, the discharge amount of the lubricating oil increases as the discharge amount of the high pressure fluid increases, and the accumulation in the high pressure chamber (2a) increases. Although the amount will increase, the opening area of the oil return passageway (45) will increase due to the increase in the above-mentioned high-pressure fluid, so the lubricating oil will surely return to the oil sump (41), and the oil shortage will surely occur. It can be prevented and reliability can be improved.

Further, at the time of low-speed rotation, the discharge amount of the high-pressure fluid becomes small and the opening area of the oil return passage (45) becomes small. Therefore, it is possible to prevent the high-pressure fluid from flowing backward and prevent the compression efficiency from decreasing. You can

(Example) Hereinafter, the Example of this invention is described based on drawing.

As shown in FIG. 1, (1) is a scroll type fluid device, which is used for a compressor in a refrigerating device and which compresses a refrigerant gas (fluid) to a high pressure and discharges it.

The scroll type fluid device (1) is configured by accommodating a scroll mechanism (3) and a drive mechanism (4) in a closed casing (2), and a suction pipe (5) on a side portion of the casing (2). ), The discharge pipe (6) is continuously provided on the upper part. The scroll mechanism (3) is a fixed scroll (7).
And a revolving scroll (8), and the drive mechanism (4) is composed of an electric motor (9) and a crankshaft (10).

The fixed scroll (7) and orbiting scroll (8) are wrapped (13), (14) on the front of the end plates (11), (12), respectively.
Are erected in a spiral shape, and both scrolls (7),
(8) is vertically arranged side by side so as to face the front surfaces of the end plates (11) and (12), and both laps (13) and (14) are meshed with each other. In the fixed scroll (7), a flange (11a) is continuously provided on the outer peripheral edge of the end plate (11) and is fixed to the casing (2) by the flange (11a), and the inside of the casing (2) is fixed scroll (7). ) It is divided into an upper high pressure chamber (2a) and a lower low pressure chamber (2b). Further, a scroll shaft (12a) is provided at the center of the rear surface of the end plate (12) of the orbiting scroll (8). On the other hand, the crankshaft (1
The support frame (0) is formed by connecting a boss (10c) having a concave scroll bearing hole (10b) to the upper end of the crank spindle (10a) and is fixed to the flange (11a) of the fixed scroll (7). It is inserted and supported in 15). Further, the crank spindle (10a) has an electric motor (9).
There are connected, scroll bearing hole (10b) is the bearing center (O ₁₎ is provided eccentrically from the axis of the crank main shaft (10a) (O _2), the revolving scroll the scroll bearing hole (10b) The scroll shaft (12a) of (8) is fitted through the stub bearing (16). The eccentricity of the scroll bearing hole (10b) causes the revolution scroll (8) to revolve with respect to the fixed scroll (7), and the center (O ₁ ) of the scroll bearing hole (10b) (the center of the scroll shaft (12a) )
Is the movable fulcrum of the revolution scroll (8), the crank spindle (10
The axis (a ₂ ) of a) is the center of revolution.

The fixed scroll (7) and the orbiting scroll (8) are provided so that both wraps (13) and (14) make multi-point contact (17) on the side surfaces, and the end faces of each wrap (13) and (14). Is in contact with the other scroll end plates (11) and (12), and a closed chamber (18) is formed between the contacts (17). Also, the fixed scroll (7) flange (11a) and wrap (1
3) is formed into a suction port (19) whose lower surface is open, while a discharge port (20) is bored at approximately the center of the end plate (11), and the pressure lower than that of the suction port (19). The refrigerant gas is supplied to the closed chamber (18), and the high pressure refrigerant gas is discharged from the closed chamber (18) to the high pressure chamber (2a) through the discharge port (20).

The support frame (15) has a substantially donut-shaped disc portion (15a) extending to the rear side of the end plate (12) of the orbiting scroll (8), and a substantially downward extension below the inner end of the disc portion (15a). It is composed of a cylindrical portion (15b). The disc portion (15a) is fixed to the flange (11a) of the fixed scroll (7) at the outer peripheral edge of the upper portion, and the communication hole (15c) through which the refrigerant gas passes extends vertically over the suction port (19). The step portion (15d) on which the end plate (12) of the orbiting scroll (8) is located is formed in the upper part while being drilled in. An electric motor (9) is attached to the lower part of the cylindrical portion (15b), and a large diameter hole (15e) into which the boss (10c) of the crankshaft (10) is fitted and a crankshaft (10a) are fitted. And a small-diameter hole (15f) formed therein, the upper crank bearing (21) is installed in the large-diameter hole (15e), and the lower crank bearing (22) is installed under the small-diameter hole (15f). (10) is fitted and supported.

Further, a thrust bearing (31) is provided between the end plate (12) of the orbiting scroll (8) and the stepped portion (15d) of the support frame (15), and the thrust force of the orbiting scroll (8) is increased. I'm taking it. Although not shown, the orbiting scroll (8) is provided with a rotation preventing mechanism, and is configured to perform only the orbiting with respect to the fixed scroll (7).

On the other hand, the disk portion (15a) of the support frame (15)
The inner peripheral side of the crankshaft is formed inside the balancer chamber (32), and the main balancer (33) is located inside the balancer chamber (32) and protrudes from the upper end of the boss (10c) of the crankshaft (10). At the same time, a sub balancer (34) is provided below the rotor (9a) of the electric motor (9) so that the inertia balance of the revolution scroll (8) is maintained by the balancer chambers (33) and (34). ing.

Next, the oil return mechanism, which is a feature of the present invention, will be described.

At the bottom of the casing (2), an oil sump (4
1) is formed, and the crankshaft (10) is formed in the oil sump (41).
The oil supply pump (42) provided in the lower part of the bearing is immersed, and although not shown, the lubricating oil is supplied to the bearings (16), (21), (22) through an oil supply passage in the crankshaft (10). And is mixed in the refrigerant gas.

On the other hand, the fixed scroll (7) in the high pressure chamber (2a)
A cover body (43) having a silencing effect on the refrigerant gas is attached to the rear surface (upper surface) of the end plate (11) of the cover plate (11) so as to cover the discharge port (20), and the cover body (43) is formed in a substantially hat shape. As shown in FIG. 2, a plurality of outflow pipes (44), (4
4), ... are connected. The outflow pipe (44) is bent and formed in an L-shape in a substantially tangential direction of the outer peripheral surface of the cover body (43) to allow the high-pressure refrigerant gas to flow out from the inside of the cover body (43) toward the outside. The lubricating oil in the refrigerant gas is configured to be centrifugally separated while being guided to rotate in the chamber (2a).

Further, the oil return passage (45) extends from the upper surface of the flange (11a) of the fixed scroll (7) to the lower surface of the disk portion (15a) of the support frame (15) to form a high pressure chamber (2a) and a low pressure chamber (2b). The oil return passageway (45) is formed in communication with the upper end opening of the recess (46) formed in the upper surface of the fixed scroll (7) to allow the lubricating oil in the high pressure chamber (2a) to flow. Oil sump (4
I am trying to return to 1). Further, on the upper surface of the fixed scroll (7), as shown in FIG. 3, a refrigerant gas pressure plate (47) and an opening adjusting means (48) for the oil return passageway (45).
And are provided.

The pressure receiving plate (47) is formed by bending a rectangular flat plate-shaped pressure receiving portion (47a) and a rectangular flat plate-shaped supporting portion (47b) supported by the opening degree adjusting means (48) into an L shape. , The pressure receiving part (4
It is rotatably supported by a pin (49) at a bending portion between the support portion (47b) and the supporting portion (47b). Then, the pressure receiving portion (47
a) is provided so as to face the outflow port of one outflow pipe (44) so as to be rotationally displaced by receiving the dynamic pressure of the refrigerant gas, and the support portion (47b) is above the opening of the oil return passageway (45). It is provided to be located in.

On the other hand, in the opening adjustment means (48), a needle valve (48a) facing the oil return passage (45) is projectingly provided on the lower surface of the support portion (47b), and the support portion (47b) and the fixed scroll (7). )
And a spring (48b) for urging the needle valve (48a) in the valve closing direction (downward in FIG. 3) is stretched between
When the needle valve (48a) moves up and down, the oil return passage (4
The opening area of 5) is adjusted.

Incidentally, reference numeral (51) in FIG. 1 is a gas passage formed in the cylindrical portion (15b) of the support frame (15) through which the refrigerant gas passes, and communicates with the balancer chamber (32).

Next, the operation of the scroll type fluid device (1) will be described.

First, the refrigerant gas flows into the case (2) through the suction pipe (5), passes through the outside of the electric motor (9) in the low pressure chamber (2b), and passes through the communication hole (15c) of the support frame (15). It is introduced into the closed chamber (18) through the suction port (19) of the fixed scroll (7).

On the other hand, the revolution scroll (8) revolves with respect to the fixed scroll (7) by the rotation of the crankshaft (10) and rotates without rotation by a rotation prevention mechanism (not shown). The enclosed chamber (1
8) is sequentially formed between both wraps (13) and (14) and contracts, compresses the refrigerant gas and discharges it from the discharge port (20).

During this compression operation, lubricating oil was mixed in the refrigerant gas in the low pressure chamber (2b) and flowed into the closed chamber (18) between the wraps (13) and (14), and this lubricating oil was compressed. The high-pressure refrigerant gas flows into the cover body (43) through the discharge port (20).
After that, the refrigerant gas flows out of the cover body (43) through the outflow pipe (44) and swirls in the high pressure chamber (2a) because the outflow pipe (44) is bent. Lubricating oil is centrifugally separated by, and only the refrigerant gas is discharged into the discharge pipe (6).
While being discharged more, the lubricating oil will be stored on the fixed scroll (7) in the high pressure chamber (2a).

Further, the needle valve (48a) is biased by the spring force of the spring (48b) in a direction of closing the opening of the oil return passageway (45), while the pressure receiving portion (47a) of the pressure receiving plate (47) is The refrigerant gas flowing out from the cover body (43) collides and receives the dynamic pressure of the refrigerant gas. Then, when the electric motor (9) is inverter-controlled and the rotation speed increases, the closed chamber (18)
The amount of refrigerant gas discharged from the
The dynamic pressure acting on a) also increases. Due to this change in dynamic pressure, the pressure receiving plate (47) rotates against the spring force of the spring (48b), the needle valve (48a) moves up and down, and the oil return passage (4
5) Change the opening area. That is, at the time of high speed rotation, the discharge amount of the refrigerant gas to the high pressure chamber (2a) increases and the amount of lubricating oil also increases. Therefore, the opening area of the oil return passageway (45) is increased and the oil sump (41) While returning a large amount of lubricating oil to
At low speed rotation, the discharge amount of the refrigerant gas decreases and the amount of lubricating oil also decreases, so the needle valve (48a) reduces the opening area of the oil return passageway (45) to reduce the reverse flow of the high pressure refrigerant gas. .

Therefore, the pressure receiving plate (47) for receiving the dynamic pressure of the high pressure refrigerant gas is provided in the high pressure chamber (2a), and the opening degree adjusting means (48) of the oil return passageway (45) is linked to the pressure receiving plate (47). Since the orbiting scroll (8) rotates at a high speed, the discharge amount of the lubricating oil increases as the discharge amount of the high pressure refrigerant gas increases, and the storage amount in the high pressure chamber (2a) increases. However, since the opening area of the oil return passageway (45) increases due to the increase in the above-mentioned high-pressure refrigerant gas, the lubricating oil can be reliably stored in the oil sump (4
By returning to 1), it is possible to reliably prevent oil shortage and improve reliability.

Further, at the time of low speed rotation, the discharge amount of the high pressure refrigerant gas is reduced and the opening area of the oil return passage (45) is reduced, so that the high pressure refrigerant gas can be prevented from flowing backward and the compression efficiency is prevented from being lowered. can do.

4 to 7 show a pressure receiving plate (47) and an opening adjusting means (48).
FIG. 4 shows another embodiment of the pressure receiving plate (47) shown in FIG.
Is configured such that a pressure receiving portion (47c) is erected in an L-shape on the slide portion (47d), the pressure receiving portion (47c) is provided facing the outflow pipe (44), and the slide portion (47d) is provided. Is provided slidably in the outflow direction of the refrigerant gas in the recess (46a) formed in the fixed scroll end plate (11). On the other hand, on the side surface of the recess (46a), the oil return passageway (45
One end of a) is bent in an inverted L shape to open, and the opening adjusting means (48) corresponds to the opening end of the oil return passage (45a).
Of the needle valve (48c) is projected from the lower end of the pressure receiving portion (47c), and the needle valve (48c) is attached between the pressure receiving portion (47c) and the side surface of the recess (46a) in the closing direction. The spring (48d) of the opening adjustment means (48) for urging is provided.

Therefore, the pressure receiving plate (47) slides according to the outflow amount of the refrigerant gas, and the needle valve (48c) adjusts the opening area of the oil return passageway (45a).

In FIG. 5, the oil return passageway (45b) is formed by arranging a plurality of (four in the drawing) small holes (45c), (45c), ... In parallel, each small hole (45c), One end of each of (45c), ... Is opened at the bottom of the recess (46a). The opening adjusting means (48) is configured by a spring (48f) stretched between an adjusting plate (48e) slidably provided in the recess (46a) and a side surface of the recess (46a). The adjustment plate (48
e) adjusts the numerical aperture of the small holes (45c), (45c), ..., while the spring (48f) adjusts the small holes (45c), (45c), ...
The adjustment plate (48e) is urged in the valve closing direction. The pressure receiving plate (47e) is composed of a single flat plate, and is erected at the front end of the adjusting plate (48e) to receive the refrigerant gas.

Therefore, when the outflow amount of the refrigerant gas increases, the pressure receiving plate (47
The dynamic pressure received by e) rises, the adjustment plate (48e) slides against the spring force of the spring (48f), and the small hole (45c),
(45c), ... The number of openings will increase. This increase will increase the amount of lubricating oil returned.

The opening adjusting means (48) shown in FIGS. 6 and 7 is composed of a slidable adjusting plate (48e) on which a spring (48f) is stretched similarly to that shown in FIG. The pressure plate (47e) is erected on 48e). Meanwhile, the oil return passage (45
d) is formed of a single passage having a slightly large diameter, and the adjusting plate (48e) is configured to adjust the opening area of the oil return passage (45d). Therefore, the amount of opening of the oil return passageway (45d) changes due to the slide of the adjusting plate (48e), and the amount of return of the lubricating oil changes.

Although the scroll type fluid device (1) of each example was used for the compressor of the refrigeration system, it may be used for the compressor of various devices, or may be used for the blower or the like. is there.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a vertical sectional view of a scroll type fluid device, FIG. 2 is a perspective view of an oil return mechanism, and FIG.
The figure is the same sectional view. 4 to 7 show another embodiment, FIG. 4, FIG. 5 and FIG. 6 are sectional views showing modified examples of the pressure receiving plate and the opening adjusting means, and FIG. 7 is shown in FIG. FIG. 4 is a plan view of the pressure receiving plate and the opening degree adjusting means shown. (1) ... scroll type fluid device, (2) ... casing,
(2a) ... high pressure chamber, (7) ... fixed scroll, (8) ... revolution scroll, (10) ... crank shaft, (11), (12) ...
End plate, (13), (14)… wrap, (18)… closed chamber, (2
0) ... Discharge port, (41) ... Oil sump, (43) ... Cover body, (4
4) ... Outflow pipe, (45), (45a), (45b), (45d) ... Oil return passage, (45c) ... Small hole, (47), (47e) ... Pressure receiving plate,
(47a), (47c) ... Pressure receiving part, (47b) ... Supporting part, (47d)
… Sliding part, (48)… Opening adjustment means, (48a), (48
c) ... Needle valve, (48b), (48d), (48f) ... Spring, (48e) ... Adjustment plate.

Claims (5)

[Claims] 1. A fixed scroll (7) in which wraps (13) and (14) are erected on the front surfaces of end plates (11) and (12), respectively.
And orbiting scroll (8) wrap each other (13),
Inside the casing (2), the (14) meshes with each other and is housed in the closed casing (2), and the end plate (11) of the fixed scroll (7) is provided with a discharge port (20). Of the fixed scroll (7) in which the rear side of the end plate (11) is formed in the high pressure chamber (2a), and the revolving scroll (8) is revolved with respect to the fixed scroll (7) without rotating. The cover body (43) is attached to the rear surface of the end plate (11) of the fixed scroll (7) so as to cover the discharge port (20), and the high pressure fluid is attached to the side surface of the cover body (43). ) Is provided with an outflow pipe (44) for guiding and flowing out so as to swirl in the outer circumferential direction, while flowing out into the high pressure chamber (2a) by opening on the rear face of the end plate (11) of the fixed scroll (7). Oil is added to the oil sump (41 An oil return passageway (45) for returning to the back side of the fixed scroll (7) and a pressure receiving plate (47) which is displaced by receiving the fluid pressure of the high pressure fluid flowing out from the outflow pipe (44). The scroll is characterized in that the pressure receiving plate (47) is continuously provided with opening degree adjusting means (48) for increasing the opening area of the oil return passage (45) as the fluid pressure increases. Type fluid device. 2. A pressure-receiving plate (47) has a support portion (47b) of an opening adjusting means (48) in which a pressure-receiving portion (47a) is bent and formed in an L-shape, and is rotatable by the bending portion. While being pivotally supported, the opening adjustment means (48) is provided with a needle valve (48) facing the oil return passageway (45).
a) is connected to the support portion (47b) of the pressure receiving plate (47), and the needle valve (48a) is urged in the valve closing direction between the pressure receiving plate (47) and the fixed scroll (7). The scroll type fluid device according to claim 1, wherein a spring (48b) is provided. 3. The pressure receiving plate (47) is constituted by a pressure receiving portion (47c) provided upright on a slide portion (47d) that slides on an end plate (11) of the fixed scroll (7), while opening degree adjusting means. (Four
In 8), the needle valve (48c) facing the oil return passageway (45a) is connected to the pressure receiving plate (47) and the pressure receiving plate (47).
A scroll type fluid according to claim 1, characterized in that a spring (48d) for urging the needle valve (48c) in a valve closing direction is provided between the fixed scroll (7) and the fixed scroll (7). apparatus. 4. The oil return passageway (45b) has a plurality of small holes (45) opened on the rear surface of the end plate (11) of the fixed scroll (7).
c), (45c), ... are arranged side by side, while the opening adjustment means (48) has an adjustment plate (48e) for adjusting the numerical aperture of the small holes (45c), (45c) ,. The adjustment plate (48e) is slidably provided on the end plate (11) of the fixed scroll (7) and is provided between the adjustment plate (48e) and the fixed scroll (7).
2. The scroll according to claim 1, wherein a spring (48f) for urging the valve in the valve closing direction is provided, and a pressure receiving plate (47e) is erected on the adjusting plate (48e). Type fluid device. 5. The opening adjusting means (48) is provided with an adjusting plate (48e) for adjusting the opening area of one oil return passage (45d) slidably on an end plate (11) of the fixed scroll (7). At the same time, a spring (4) for urging the adjusting plate (48e) in the valve closing direction is provided between the adjusting plate (48e) and the fixed scroll (7).
8. The scroll type fluid device according to claim 1, further comprising a pressure receiving plate (47e) provided upright on the adjusting plate (48e).