JPH04103204U - scroll type fluid machine - Google Patents

Abstract

(57) [Summary] [Purpose] Seal members 26, 27 that seal back pressure chambers 28, 31
By reducing the diameter of the scroll type fluid machine, the scroll type fluid machine is made smaller and lighter. [Structure] Seal members 26 and 27 are provided on the fixed case 6 side.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a scroll type fluid machine that can be used as a compressor or an expander.

0002

[Conventional technology]

FIG. 2 shows an example of a conventional scroll compressor. Inside the sealed housing 8, there is a scroll type compression mechanism C in the upper part and an electric charger in the lower part. A dynamic motor M is provided, and these are interlocked and connected to each other via a rotating shaft 5. There is. The electric motor M consists of a rotor Ma and a stator Mb, and the rotor Ma has a rotating shaft 5. The stator Mb is fixed to the housing 8.

0003 The scroll type compression mechanism C includes a fixed scroll 1 and an orbiting scroll that mesh with each other. 2. The fixed scroll 1 has a spiral shape erected on an end plate 11 and its inner surface. The end plate 11 has a discharge port 13 and a discharge port for opening and closing the discharge port 13 in the center of the end plate 11. A vent valve 17 is provided. The orbiting scroll 2 is installed upright on the end plate 21 and the inner surface thereof. A drive block is provided in a boss 23 erected on the outer surface of the end plate 21. A drive bush 54 is rotatably fitted through a swing bearing 73, and An eccentric pin 53 protruding from the upper end of the rotating shaft 5 is rotatably inserted into the drilled hole 55. It is fitted. Then, the fixed scroll 1 and the orbiting scroll 2 are placed in a predetermined position relative to each other. By making them eccentric by the distance and shifting the angle by 180°, they mesh. A plurality of sealed spaces 24 are formed.

0004 A fixed case 6 is fixed in the sealed housing 8 by plug welding 7, and this fixing A fixed scroll 1 is fastened to a case 6 with bolts 9. and swirl The sliding surface 25 formed on the outer surface of the end plate 21 of the scroll 2 is in contact with the sliding surface 6a of the fixed case 6. opposite. Concentric annular seal members 26 and 27 are embedded in this sliding surface 25. The front end surfaces of the seal members 26 and 27 are in sliding contact with the sliding surface 6a, and the sliding surfaces 25 and 6a are connected to each other. An intermediate pressure chamber 28 is formed between them. This intermediate pressure chamber 28 has an end plate 21. Gas being compressed in the sealed space 24 is introduced through the drilled pressure hole 29. It has become. The orbiting scroll 2 revolves around the outer periphery of these sliding surfaces 25 and 6a. A rotation prevention mechanism 3 such as an Oldham link that allows rotational movement but prevents rotation. It is arranged.

[0005] By driving the electric motor M, the rotating shaft 5, the eccentric pin 53, and the drive The orbiting scroll 2 is driven via a revolution mechanism consisting of a bush 54, a boss 23, etc. The orbiting scroll 2 revolves while being prevented from rotating by the rotation prevention mechanism 3. It revolves around a circular orbit with the radius as its radius. Then, the gas is sucked into the sealed space 24 through the suction pipe 82 and the suction chamber 16. and , as the volume of the closed space 24 decreases due to the orbiting movement of the orbiting scroll 2. It reaches the center part while being compressed, and pushes open the discharge valve 17 from the discharge port 13 to open the sealed chamber. It is discharged into the housing 8, and from there it is discharged to the outside through a discharge pipe 83.

[0006] The high-pressure gas discharged into the sealed housing 8 is transferred to a bearing that supports the rotating shaft 5. 71 etc., enters the high pressure chamber 31 formed on the inner peripheral side of the intermediate pressure chamber 29, and The gas that is being compressed in the sealed space 24 enters the intermediate pressure chamber 29 through the pressure guiding hole 29, and these high The gas pressure in the pressure chamber 31 and the intermediate pressure chamber 29 acts on the outer surface of the end plate 21 of the orbiting scroll 2. The orbiting scroll 2 is pressed against the fixed scroll 1. Note that the outer peripheral side of the intermediate pressure chamber 29 communicates with the suction chamber 16 and is maintained at a low pressure.

[0007]

[Problem that the idea aims to solve]

In the above-mentioned conventional scroll-type fluid machine, the seal part that seals the back pressure chamber 28 is Since the materials 26 and 27 are installed on the outer surface of the end plate 21 of the orbiting scroll 2, the orbiting scroll Seal members 26 and 27 are removed from the sliding surface 6a of fixed case 6 regardless of the rotational movement of roll 2. In order to prevent it from protruding, it is necessary to enlarge the sliding surface 6a of the fixed case 6. Therefore, there was a problem that the diameter of the scroll type fluid machine became large.

[0008]

[Means to solve the problem]

This invention was proposed to solve the above problems, and its gist is as follows: However, each fixed scroll is made up of a spiral wrap on the inner surface of the end plate. and the orbiting scroll are interlocked with each other to prevent the rotation of the orbiting scroll. While rotating, the outer surface of the end plate and the fixed cage facing it are by introducing intermediate pressure or high pressure into the back pressure chamber formed between the In the scroll-type fluid machine that presses against the fixed scroll, the back pressure chamber is A scroll type flow system characterized in that a sealing member that rotates is provided in the fixed case. It's in the body machine.

[0009]

[Effect]

In this invention, since the above structure is provided, the fixed case does not revolve around the revolution. Therefore, even if the diameter of the seal member is made smaller, it will not be visible from the sliding surface of the orbiting scroll. It never leaks out.

0010

【Example】

One embodiment of the invention is shown in FIG. As shown in FIG. 1, annular sealing members 26, 27 for sealing the intermediate pressure chamber 28 is buried in the sliding surface 6a of the fixed case 6. Then, the inner seal member 26 is It is arranged close to the inner diameter of the moving surface 6a, and therefore its diameter is smaller than that of the conventional one. ing. In addition, the diameter of the outer seal member 27 reduces the thrust loss of the orbiting scroll 2. The diameter is set such that a sufficient pressure receiving area of the intermediate pressure chamber 29 can be obtained to reduce the pressure. The rest of the configuration is the same as the conventional one shown in Figure 2, and corresponding members are designated by the same reference numerals. It is attached. In the above embodiment, the high pressure chamber 31 and the outer surface of the end plate 21 of the orbiting scroll 2 are Although it forms both the intermediate pressure chamber 29 and the intermediate pressure chamber 29, it is also possible to form only one of them. .

[0011]

[Effect of the idea] In this invention, a sealing member for sealing the back pressure chamber is provided in the fixed case. As a result, the fixed case does not revolve or rotate, so even if the diameter of the seal member is made small, this will not occur. There is no possibility that the material will protrude from the sliding surface of the orbiting scroll. As a result, the diameter of the fixed case can be reduced, making it possible to reduce the diameter of the fixed case. The diameter of the machine can be reduced, and therefore it can be made smaller and lighter. can reduce costs.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a conventional scroll-type fluid machine.

[Explanation of symbols]

1 Fixed scroll 11 End plate 12 laps 2 Orbital scroll 21 End plate 22 laps 28 Back pressure chamber 31 Back pressure chamber 26 Seal member 27 Seal member 6 Fixed case

Claims (1)

[Scope of utility model registration request] 1. A fixed scroll and an orbiting scroll each having a spiral wrap erected on the inner surface of an end plate are meshed with each other, and the orbiting scroll is caused to revolve around the orbit while preventing its rotation, and the end plate In a scroll-type fluid machine that presses the fixed scroll by introducing intermediate pressure or high pressure into a back pressure chamber formed between the outer surface of the scroll and a fixed case facing the fixed scroll,
A scroll type fluid machine characterized in that a sealing member for sealing the back pressure chamber is provided in the fixed case.