JPS62206282A - Scroll compressor - Google Patents

Abstract

PURPOSE:To enable a scroll compressor to be used oillessly by making a cooling medium flow to a housing of said compressor provided with a drive scroll and a driven scroll. CONSTITUTION:A shaft sealing body 31 is provided in a portion of one housing 7 through which extends a rotary shaft 25 of a motor 23 for rotating a drive scroll 1, while another shaft sealing body 21 is provided between a driven shaft 5 of a driven scroll 2 and the other housing 11. And flow paths 8, 12 for a cooling medium are formed in both housings 7, 11. By this constitution is completely sealed a suction chamber 40 surrounded by the housings 7, 11 from the outside, while the shaft sealing bodies 21, 31 and bearings 16, 27 for the rotary shaft 25 and the driven shaft 5 can be effectively cooled so that a scroll compressor can be used oillessly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a full-system rotating scroll compressor that rotates a driving scroll and a driven scroll, and particularly relates to a scroll compressor that rotates a driving scroll and a driven scroll. It is related to the mechanism that prevented this.

[Conventional technology]

The principle of a scroll compressor has been known for a long time.It is a type of volume expansion compressor that performs compression by combining a pair of spiral projections.Normally, one of the spiral projections is fixed and the other is oscillated. The compression effect is achieved by movement, but the principle of a so-called whole-system rotation type in which both spiral protrusions are rotated around their respective centers is also known.

A diagram of the principle of this fully rotating scroll compressor is shown in FIG. The drive scroll 1 has a single electric motor engine.

Or, by the rotation of both driven scrolls 2 which are rotated around their shaft center 01 by a drive source such as a turbine, and which are also rotated around their shaft center o2 in synchronization with the rotation of the driving scroll 1. The compression chamber 3 moves toward the center and reduces its volume, the pressure of the compressed gas increases, and the compressed gas is forced out from the discharge port 20 as high-pressure gas. This is a state in which gas is sucked into the compression chamber 3, and from 0° → 9 as shown in (b) to (d).
By rotating 0°=180°→270°→3600° (0°), the compression chamber 3 gradually moves toward the center and its volume decreases. During this time, the spiral projections 1a of both scrolls 1.2,
It can be seen that the radial seal portion S according to 2a is aligned in a straight line in the radial direction and occupies a fixed position in a stationary state.

[Problem that the invention seeks to solve]

In the above-mentioned conventional scroll compressor of the full-system rotation type, lubricating oil is used to lubricate each bearing that supports the driving scroll and the driven scroll, and the lubricating oil is stored at the bottom of the scroll compressor container. , was refueled with an oil pump. Therefore, oil entered the gas suction chamber, and the compressed gas discharged contained oil. Particularly, for laser gas circulation, contamination of oil is not allowed, and conventional scroll compressors cannot be used as compressors for this type of high-purity gas.

This invention was made to solve these problems, and aims to provide a scroll compressor in which the compression section is free of oil and the compressed gas discharged is completely free of oil.

[Failure to solve the problem]

In the scroll compressor according to the present invention, a drive source for driving the drive scroll is placed outside the container of the compressor and supported in one housing, and a rotating shaft on the drive side is sealed in one housing and passes through the driven scroll. A driven wheel is supported in the other housing via a bearing, and both sides of this driven shaft are sealed.
A cooling medium is circulated through each housing without using lubricating oil.

[Effect]

The rotating shaft on the drive side and the driven shaft of the driven scroll are sealed υ, and the suction chamber that accommodates both scroll parts is sealed, so that the compression chamber and the discharged compressed gas do not contain any oil.
Further, the housing is cooled by a cooling medium, and thereby each seal portion and bearing portion are cooled by heat radiation.

〔Example〕

FIG. 1 is a longitudinal sectional view showing an embodiment of a scroll compressor according to the present invention. In the figure, reference numeral 1 denotes a driving scroll, a disk portion 1b is provided with a spiral protrusion 1&, and a boss portion I
C is issued. 2 is a driven scroll, and a disc portion 21
) The spiral projections 2a provided in K are combined with the spiral projections 1aK (see FIG. 2), a driven shaft 5 is integrally formed or fixed, and a discharge port 2C is provided. 6 is a cylindrical container, and 7 is one housing attached to one end of this container 6 with a bolt 28, in which a flow passage 8 for a cooling medium such as cooling water is formed, and an inlet 9 and an outlet 10 are provided. It is being Reference numeral 11 denotes the other housing attached to the other end of the container 6 by bolts 29, in which a flow path 12 for a cooling medium such as cooling water is formed, and an inlet stop and an outlet 14 are provided. A cylindrical bearing support part 15 is provided integrally or fixedly. 16°: LI'F is a pair of bearings that support the driven shaft 5 in the radial direction and receive thrust in the back direction, and if necessary, at least one of them is a radial thrust type bearing. 018 is the bearing 16
．． The spacing ring 19 inserted between l'7 is a shaft sealing body mounted above the bearing 16, and is received in the axial direction by a C-shaped retaining ring 20, sealing the upper part of the driven shaft 5. ing. 2
1 is a shaft sealing body that seals the lower part of the driven shaft 5, and a C-shaped retaining ring 2
It is accepted by 2.

Next, reference numeral 23 is an electric motor as a drive source, for example, a general-purpose flange-equipped electric motor is used, and the flange 24 is connected to a bolt 30.
It is attached to I Uzing 7 by.

Reference numeral 25 denotes a rotating shaft of the electric motor 23, which passes through the nozzle 7 and is fitted into the boss IC of the sounding scroll 1, with a key 26 fitted between the two and fixed by a set screw 2'7. A shaft seal 31 is fitted into a shaft through hole of the housing 7 to seal the rotary shaft 25, and is received by a C-shaped retaining ring 32. 33 and 34 are tip seals fitted to the end faces of the spiral protrusions 1a and 2a; 35 and 36 are O" rings fitted and sealed in the housings 7 and 11; 37 are suction pipes fixed to the container 6 and introducing gas; 3 is a discharge pipe that is attached to the end of the bearing support part 15 of the housing 11 by a bolt 39 and is used to forcefully feed compressed gas.The container 6.40 is formed in a sealed manner by the housing 7. 1. The above-mentioned shaft seals 19, 21.31 are suction chambers that accommodate 1.
A type that does not require lubrication and is sealed against the rotating shaft is used.

The operation of the compressor in the above embodiment is as follows. When the electric motor 23 is rotated, the driving scroll 1 is rotated around the shaft center 01, and the spiral arrow body 2a comes into contact with the spiral protrusion 1a, and the driven scroll 2 follows and rotates around the shaft center o2. As both scrolls rotate, the first gas is sucked, compressed, and discharged as shown in FIG. 2. As the scrolls 1 and 2 rotate, the gas from the suction pipe 37 is sealed. is sucked into the suction chamber 40 and enters the compression chamber 3. The gas that has entered the compression chamber 3 is directed toward the center while being compressed, and is forced to the outside from the discharge pipe 38 via the discharge port 2C.

A shaft seal 31 fixed to the housing 7 separates and seals the side of the suction chamber to prevent steam such as grease from the bearing of the electric motor 24 and outside air from entering the suction chamber 40. Further, the shaft sealing body 19°21 fixed to the housing 11 is connected to the bearing 16.
, l'7 are sealed to prevent vapors such as grease from entering the suction chamber 3 and the compressed gas discharge side, and the discharge side and the upper side of the suction chamber 4 are sealed off.

Both housings 7 and 11 are cooled by a cooling medium flowing through the flow passages 8 and 12, and the oil-free bearings and shaft seals are effectively cooled, and the electric motor 23 is also cooled. Note that the cooling medium flowing through the housing 7.11 is as follows:
In addition to cooling water, cooling air, a fluorocarbon-based cooling medium, etc. may be used.

Further, in the above embodiment, the drive scroll 1 is supported by using the rotating shaft 25 of the electric motor 23 as the rotating shaft. [Effects of the Invention] As described above, according to the present invention, the driving scroll and the
The driven scroll part, which is rotated by the rotation of the scroll, is housed in a suction chamber formed by sealing a container and both housings that are airtightly attached to both ends of the container. The rotating shaft is sealed with one housing, and the driven shaft of the driven scroll is sealed on both sides with another housing, so that the cooling medium can flow through each housing, so each bearing and shaft seal It cools effectively without requiring lubricating oil, and the compressed gas contains no oil at all, making it suitable for use as a compressor for high-purity gases.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of a scroll compressor according to the present invention, and FIG. 2 is a diagram of the operating principle of a fully rotating scroll compressor.

Claims (6)

[Claims] (1) In a compressor in which a driven scroll is rotated by a driven scroll by contact of both spiral protrusions, a cylindrical container and both ends of the container are airtightly attached. A sealed suction chamber is formed with the housing, and both of the scroll parts are accommodated in the suction chamber. In the scroll compressor, the other housing supports the driven shaft of the housing via a bearing, and both sides of the driven shaft are sealed by a pair of shaft sealing bodies, so that a cooling medium flows through each of the housings. (2) The scroll compressor according to claim 1, wherein the cold section medium comprises cooling water. (3) The cooling medium is cooling air.
Scroll compressor as described in section. (4) The scroll compressor according to claim 1, wherein the refrigerant medium is a fluorocarbon-based refrigerant. (5) The scroll compressor according to any one of claims 1 to 4, wherein the shaft seal is a magnetic fluid seal. (6) The scroll compressor according to any one of claims 1 to 5, wherein the driven shaft bearings are a pair of spaced apart bearings, at least one of which is a radial thrust bearing. (7) The scroll compressor according to any one of claims 1 to 6, wherein the drive scroll is coupled and supported by a rotating shaft of an electric motor as a drive source.