JPH0135196B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scroll fluid machine, and particularly to a scroll fluid machine suitable for high-speed rotation and large-scale applications.

Conventional scroll machines are constructed such that a fixed scroll is fixed to a housing and an orbiting scroll is orbited about the center of the fixed scroll.

However, in the conventional type, since the drive shaft of the orbiting scroll has a cantilever structure, vibrations become large in the type for high-speed rotation. In addition, in large-sized scrolls, the centrifugal force of the orbiting scroll becomes very large, increasing the load acting on the bearing provided at the back of the orbiting scroll, resulting in a problem of decreased efficiency and reliability.

On the other hand, as a scroll fluid machine for high-speed rotation, US Pat. No. 3,884,599 discloses a type in which both scrolls rotate and one scroll rotates relative to the other scroll. However, this type has the following problems.

In other words, since the rotating scroll is made to swing relative to the drive shaft, during high-speed rotation,
There is a risk that the rotating scroll may vibrate violently, and this is not necessarily satisfactory as a scroll fluid machine for high-speed rotation. Furthermore, in the conventional method, a space is provided between the back surface of the rotating scroll and the drive shaft, and discharge pressure is applied to this space.
Since the axial sealing force between the rotating scroll and the fixed scroll is applied, in such a method, a large thrust force generated by the discharge pressure acts on the drive shaft, and especially in large scrolls, this thrust force is very large, reducing efficiency and reliability. In addition, with the above-mentioned method of obtaining axial sealing force between the rotating scroll and the fixed scroll using the discharge pressure, it is not possible to obtain an appropriate axial sealing force when the suction pressure and discharge pressure fluctuate. There's a problem.

An object of the present invention is to provide a scroll fluid machine that is suitable for high-speed rotation and large-scale use, and is highly efficient and reliable.

A feature of the present invention is that the first and second scrolls are installed such that they can rotate in the same direction, and the space between the end plate of the first scroll and the inner wall of the housing opposite thereto, and A sealed space is formed by a sliding ring having a sealing function between the end plate of the scroll and the inner wall of the housing opposite thereto, and further, a sealed space is formed between the end plate of the scroll and the inner wall of the housing opposite thereto. A gas vent was provided to introduce gas pressure into the sealed space during the process, and this configuration ensured that the above objective could be achieved.

Hereinafter, the present invention will be explained based on the drawings.

1 to 5 show an embodiment of the present invention.

The embodiment shown in these figures includes a housing 1, a discharge chamber 6, a first scroll 9 that is a driving scroll housed inside the housing 1, a second scroll 10 that is a driven scroll, and a first scroll 10 that is a driven scroll. A rotating shaft 21 that is a driving shaft integrated with the scroll 9, a rotating shaft 22 that is a driven shaft integrated with the second scroll 10, an electric motor 29 that is a driving source for the first and second scrolls 9 and 10, and a sliding shaft. A sealed space 43 formed by the ring 37 between the end plate 11 of the first scroll 9 and the inner wall 2' of the first housing member 2 opposite thereto, and the sliding ring 3
8, a sealed space 44 formed between the end plate 12 of the second scroll 10 and the inner wall 3' of the second housing member 3 opposite thereto, and a lubrication system path.

As shown in FIG. 1, the housing 1 is constructed by combining first and second housing members 2 and 3. A gas suction port 30 is formed on the side of the second housing member 3, and an end cover 5 having an oil supply hole 49 is attached to the end of the cylindrical portion 4.

The discharge chamber 6 is connected to the first housing member 2, as shown in FIG. 1, and has a gas outlet 3 in the side thereof.
Further, the cylindrical portion 7 is provided with an oil supply hole 47, and an end cover 8 is attached to the end of the cylindrical portion 7.

The first scroll 9 has an end plate 11 and a lap 13. On the other hand, the second scroll 10 includes an end plate 12, a lap 14, and the end plate 12.
a peripheral edge portion 15 provided in the first scroll 9;
The peripheral edge portion 15 is placed opposite the outer edge portion of the end plate 11 of the
It has a flange 16 provided at. The second scroll 10 has a sealed chamber 32 inside the peripheral edge 15, and a gas inlet 31 is provided in the peripheral edge 15. Said laps 13, 14
As shown in FIG. 5, they are formed into a spiral shape consisting of involutes or similar curves, and are interlocked with each other. the end plate 11,
12, from the sealed room 32 to the sealed space 43, 4.
Gas holes 35 and 36 are provided for introducing gas pressure into the interior of the housing. Furthermore, the first scroll 9
end plate 11 of and flange 1 of second scroll 10
Oldham ring 17 is installed between 6 and 1st
As the scroll 9 is driven, the second scroll 10 is driven in the same direction, and when stopped, the second scroll 10 is drivingly connected to the first scroll 9 so as not to rotate.

In FIG. 1, 18 is the sliding surface between the lap 14 of the second scroll 10 and the end plate 11 of the first scroll 9, and 19 is the lap 13 of the first scroll 9.
The sliding surface of the end plate 12 of the second scroll 10 is shown.

As shown in FIGS. 1 and 5, the rotational shaft 21 of the first scroll 9 and the rotational shaft 22 of the second scroll 10 are eccentrically spaced with their centers O ₁ and O ₂ at a distance ε from each other. installed. A sealed chamber 3 formed between the wraps 13 and 14 is provided in the half of the rotating shaft 21 of the first scroll 9 on the end plate 11 side.
A gas discharge port 33 leading from the discharge chamber 6 to the discharge chamber 6 is provided. Further, the rotating shaft 21 of the first scroll 9 is supported by a bearing 23 provided in the boss portion of the first housing member 2 and a bearing 24 provided in the cylindrical portion 7 of the discharge chamber 6,
It is designed to be able to rotate at a fixed position in the axial direction,
And it is directly connected to the electric motor 29. Note that a pusher 25 having an oil supply hole 46 communicating with an oil supply pipe 45 is provided between the rotation shaft 21 of the first scroll 9 and the boss portion of the first housing member 2, and a pusher 25 is provided between the rotation shaft 21 of the first scroll 9 and the boss portion of the first housing member 2. A mechanical seal 26 is assembled between the cylindrical portion 7 and the end cover 8 attached thereto. On the other hand, the rotation shaft 22 of the second scroll 10 is supported by a bearing 27 provided in the second housing member 3 and a bearing 28 provided in the cylindrical portion 4, and together with the second scroll 10, It is mounted so that it can move axially.

Of the sliding rings 37 and 38, the second housing member 3 and the end plate 1 of the second scroll 10
As shown in FIG. 2, a plurality of grooves 39 for forming an oil film are provided at equal intervals in the circumferential direction on the sliding surface of the sliding ring 38 interposed between the two. , each groove 39 has a length l in the rotational direction a of the second scroll 10, as shown enlarged in FIG.
It is formed into a wedge shape which is long and whose depth gradually decreases in the direction of rotation a. Moreover, this sliding ring 38 is fitted into a fitting groove 40 formed in the second housing member 3, as shown in FIG. A sealing member 41 is installed between the sliding ring 38 and one side of the fitting groove 40, and the sliding ring 38 extends along the guide pin 42 in the axial direction of the rotating shaft 22 of the second scroll 10. It is supported so that it can slide. Further, gas pressure is applied to the back of the sliding ring 38, and the sliding ring 38 is configured to come into close contact with the end plate 12 of the second scroll 10 due to the effect of this gas pressure. On the other hand, the sliding ring 37 interposed between the first housing member 2 and the end plate 11 of the first scroll 9 is
The sliding ring 38 is mounted vertically symmetrically, and
sliding in the axial direction of the rotating shaft 21 of the scroll 9,
It is similar to the sliding ring 38 in that it is configured so that it can be brought into close contact with the end plate 11 of the first scroll 9 by the action of gas pressure applied to the back.

Accordingly, in this embodiment, the sliding ring 37 has a sealing space 43 formed between the end plate 11 of the first scroll 9 and the inner wall 2' of the first housing member 2. 38, the sealed space 44 formed between the end plate 12 of the second scroll 10 and the inner wall 3' of the second housing member 3 has a large volume, and the end plate 11 of the first and second scrolls 9, 10, 12, wrap the gas vents 35 and 36
3 and 14 at substantially the same winding angle positions, and even if the gas pressures in the sealed spaces 43 and 44 are made substantially the same, the pressing force acting on the end plate 12 of the second scroll 10 can be increased. ing.

The lubrication system path has two systems. In one system, as shown in FIG.
3 and then the end plate 1 of the first scroll 9
1 and the inner wall 2' of the first housing member 2, and after lubricating the sliding ring 37, the sliding ring 37 and the first scroll 9
It is arranged to enter the inside of the housing 1 through the gap between the end plates 11. Another route is the same route 1.
As shown in the figure, lubricating oil 50 flows from the discharge chamber 6 to the cylindrical portion 7 of the discharge chamber 6, and
4, and then enters the cylinder part 4 of the second housing member 3 through the oil supply hole 47, oil supply pipe 48 and oil supply hole 49 provided in the cylinder part 7, and the bearing 2
7, 28, enters the sealed space 44 formed between the end plate 12 of the second scroll 10 and the inner wall 3' of the second housing member 3, and the sliding ring 3
8 is lubricated, and then passes through the gap between the sliding ring 38 and the end plate 12 of the second scroll 10 and enters the interior of the housing 1. The lubricating oil that has merged inside the housing 1 is made into a spray state, lubricates the Oldham ring 17, and flows together with the gas from the suction port 31 to the sealed chamber 32, where it connects the lap 14 of the second scroll 10 and the first After lubricating the sliding surface 18 between the end plate 11 of the first scroll 9 and the sliding surface 19 between the lap 13 of the first scroll 9 and the end plate 12 of the second scroll 10, the second scroll 9 is lubricated with gas. The lubricating oil is returned to the discharge chamber 6 through a discharge port 33 provided on the rotating shaft 21 of the scroll 9 of No. 1, where the lubricating oil is separated from the gas.

The scroll fluid machine of the above embodiment has a function as a compressor or an expander, and functions as a compressor as follows.

When the electric motor 29 is driven, the first scroll 9
The first scroll, which is driven through the rotating shaft 21 of
The rotational force of the scroll 9 is then transmitted via the Oldham ring 17 to the second scroll 10, which is the driven scroll, and the first and second scrolls 9, 10 are spaced apart from each other by a distance ε,
They are rotated in the same direction at eccentric positions.

When the first and second scrolls 9, 10 are rotated, gas is sucked through the suction port 30 formed in the second housing member 3, enters the inside of the housing 1, and then enters the second housing member 3. It enters the sealed chamber 32 through the suction port 31 provided in the scroll 10 .

Then, when the first and second scrolls 9 and 10 are rotated counterclockwise when viewed from the top from the gas suction completion state shown in FIG. 5A, as shown in FIGS. 5B, C, and D. The volume of the sealed chamber 32 is gradually reduced so that the gas sucked into the sealed chamber 32 is compressed.

When the volume of the sealed chamber 32 is the lowest, as shown in FIG. enter,
The discharge chamber 6 is discharged from the discharge port 34 provided therein.

During the gas compression process described above, the pressure in the sealed chamber 32 increases, and a force is applied to the second scroll 10 in the direction of separating it from the first scroll 9. However, during the compression process, the second scroll 10 end plate 12 of
Gas pressure flows from the gas passage hole 36 provided in the second scroll 10 into the closed space 44 formed by the sliding ring 38 between the end plate 12 of the second scroll 10 and the inner wall 3' of the second housing member 3. introduced into the closed space 4
Since an appropriate pressure higher than the suction pressure and lower than the discharge pressure is applied inside the scroll 4, detachment of the second scroll 10 can be prevented and the sliding surfaces 18 of the first and second scrolls 9, 10, It is possible to achieve sealing of the first and second scrolls 9 and 10 in the axial direction without applying an excessive pressing force to the scrolls 19.

At this time, the sliding rings 37 and 38 have the first,
Since the gas pressure acts in the direction of bringing the second scrolls 9, 10 into close contact with the end plates 11, 12, the sealed spaces 43, 44 can be reliably sealed.

Simultaneously with the above-mentioned sealing action, sliding occurs between the end plate 11 of the first scroll 9 and the inner wall 2' of the first housing member 2 through the gas passage hole 35 provided in the end plate 11 of the first scroll 9. Gas pressure is introduced into the sealed space 43 formed by the ring 37, and this gas pressure causes the rotation shaft 21 of the first scroll 9 to rotate.
The thrust load on the bearings 23 and 24 supporting the can be significantly reduced.

During this time, the lubricating oil 50 in the discharge chamber 6 passes through the oil supply pipe 45 and the oil supply hole 46 provided in the pusher 25 to the bearing 2 of the rotating shaft 21 of the first scroll 9.
3 and after lubricating the bearing 23, the end of the first scroll 9 passes through the sealed space 43 formed between the end plate 11 of the first scroll 9 and the inner wall 2' of the first housing member 2. Plate 11 and sliding ring 37
The lubricating oil forms an oil film between the two members, and after the oil film is formed, the lubricating oil flows into the housing 1.

The sliding ring 37 is provided with wedge-shaped grooves 39 for forming an oil film at equal intervals in the circumferential direction, so that the sliding ring 37 and the end plate 11 of the first scroll 9 are provided with wedge-shaped grooves 39 at equal intervals in the circumferential direction. Since an oil film is reliably formed, solid contact between the end plate 11 and the sliding ring 37 can be eliminated, thereby reducing friction loss and greatly reducing gas leakage from the sealed space 43. be able to.

On the other hand, the lubricating oil 50 in the discharge chamber 6 flows into the cylindrical portion 7 of the discharge chamber 6, lubricates the bearing 24 of the rotating shaft 21 of the first scroll 9, and then enters the oil supply hole provided in the cylindrical portion 7. 47, oil supply pipe 48,
The oil enters the cylinder part 4 of the second housing member 3 through the oil supply hole 49 provided in the end cover 5 of the cylinder part 4 of the second housing member 3, and enters the bearing 27 of the rotating shaft 22 of the second scroll 10. , 28;
It then flows into the sealed space 44 formed between the end plate 12 of the second scroll 10 and the inner wall 3' of the second housing member 3, and further enters between the sliding ring 38 and the end plate 12 of the second scroll 10. The lubricating oil forms an oil film between both members, and the lubricating oil also flows into the housing 1.

At this time, since the sliding ring 38 is also provided with a groove 39 for forming an oil film, an oil film is reliably formed, and the oil film fixes the end plate 12 of the second scroll 10 and the sliding ring 38. Contact can be prevented and gas leakage from the closed space 44 can be extremely reduced.

The lubricating oil flowing into the housing 1 lubricates the Oldham ring 17 and enters the sealed chamber 32 together with the gas through the suction port 31 provided in the annular peripheral portion 15 of the second scroll 10. After lubricating the sliding surfaces 18 and 19 of the first and second scrolls 9 and 10, the sealing chamber 32 passes through the discharge port 33 and returns to the discharge chamber 6, where it is separated into gas and lubricating oil. Lubricating oil is stored in the discharge chamber 6.

Note that when the scroll fluid machine is used as an expander, the first and second scrolls 9, 1
0 may be rotated in a direction opposite to that shown in FIGS. 5A to 5D.

Next, FIG. 6 shows another embodiment of the sliding ring used in the present invention. In this embodiment, a tip seal 51 is attached to the sliding surface side of the sliding ring 38, and the tip seal 51 is attached to the second embodiment. The end plate 12 of the scroll 10 is brought into contact with the end plate 12 of the scroll 10. The tip seal 51 is made of a solid lubricating material such as Teflon or carbon.

The sliding ring shown in this embodiment can exhibit the same lubrication function as the sliding ring shown in FIG. is similar to that shown in FIG. 5, and it is also possible to use it by interposing it between the inner wall 2' of the first housing member 2 of the first scroll 9 by assembling it vertically symmetrically. Similar to that shown in the figure.

Note that a compression spring may be provided between the sliding ring and the fitting groove so that the sliding ring is brought into pressure contact with the end plates 11 and 12 of the first and second scrolls 9 and 10.

In addition, in the illustrated embodiment, the gas vents 35 and 36 are
Lap 13 of the first and second scrolls 9, 10,
14, and the volume of the sealed space 44 formed between the end plate 12 of the second scroll 10 and the inner wall 3' of the second housing member 3 is equal to that of the end of the first scroll 9. The volume of the sealed space 43 formed between the plate 11 and the inner wall 2' of the first housing member 2 is larger than that of the second scroll 1.
However, the volumes of the sealed spaces 43 and 44 are made the same, and the end plate 12 of the second scroll 10 and the inner wall 3 of the second housing member 3 are made to have the same volume. The end plate 11 of the first scroll 9 and the first housing member 2
It may be arranged closer to the winding start position of the wrap than the gas passage hole 35 communicating with the sealed space 43 formed between the inner walls 2' of the wrap, so as to introduce a high gas pressure into the sealed space 44.

The present invention has the configuration and operation described above,
According to the present invention, since the first and second scrolls are rotated in the same direction via rotating shafts provided at eccentric positions relative to each other, excellent effects are obtained for high-speed rotation and large-sized applications.

Further, in the present invention, a sealing function is provided between the end plate of the first scroll and the inner wall of the housing opposing this, and between the end plate of the second scroll and the inner wall of the housing opposing this. Since a sealed space is formed by the sliding ring and gas pressure is introduced into the sealed space during the gas compression or expansion process, an appropriate sealing pressure can be maintained in the axial direction of the first and second scrolls. Moreover, since the rotational motion of the first and second scrolls can be stabilized by the gas pressure, there is an effect that high efficiency and high reliability can be achieved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of one embodiment of the present invention, and FIG.
The figure is a bottom view of the sliding ring for forming a sealed space.
The figure is a partially enlarged sectional view taken from the - line in Figure 2.
Fig. 4 is an enlarged longitudinal sectional view of the sliding ring in its interposed state, Figs. FIG. 2 is an enlarged vertical sectional view showing an example. DESCRIPTION OF SYMBOLS 1... Housing, 2, 3... First and second housing members, 2', 3'... Inner walls of first and second housing members, 6... Discharge chamber, 9, 10
...First and second scrolls, 11, 12... End plates of first and second scrolls, 13, 14... Same lap, 17... Oldham ring, 21, 22...
...Rotation axes of the first and second scrolls, O ₁ , O ₂ ...
...Center of rotation axis, ε... Distance between rotation axes, 29...
Electric motor, 32... sealed room, 35, 36... first,
a gas vent provided in the end plate of the second scroll;
37, 38... Sliding ring, 39... Groove for forming an oil film provided in the sliding ring, 43... Sealed space formed between the end plate of the first scroll and the inner wall of the first housing member , 44...A closed space formed between the end plate of the second scroll and the inner wall of the second housing member, 51...A tip seal provided on the sliding ring.

Claims (1)

[Scope of Claims] 1. A first scroll and a second scroll having a spiral wrap formed of an involute or a similar curve on the end plate are housed inside the housing with the wraps interlocking with each other, and 1,
In a scroll fluid machine in which a second scroll is installed so as to be able to rotate in the same direction via rotation shafts provided eccentrically to each end plate, the end plate of the first scroll and a housing opposite thereto. A sealed space is formed by a sliding ring having a sealing function between the end plate of the second scroll and the inner wall of the housing opposite thereto, and further between the end plate of the second scroll and the inner wall of the housing facing the second scroll. A scroll fluid machine characterized in that a gas vent is provided in the end plate of the scroll for introducing gas pressure into the sealed space during the gas compression or expansion process. 2. According to claim 1, the structure is such that gas pressure is applied to each sliding ring so that the sliding ring can be brought into close contact with the end plates of the first and second scrolls. scroll fluid machine.