JPH03151581A - Cooling device for compressor - Google Patents

Abstract

PURPOSE:To use a tank to attenuate pressure pulsating wave generated from a compression element so as to prevent a heat exchanger from being broken by disposing the tank near the compression element of a radiating heat exchanger in a device for supplying cooled oil to the compression element. CONSTITUTION:Helium gas allowed to flow into each cylinder 12, 13 is compressed by each roller 16, 17 in cooperation with each vane and is delivered into each cup muffler 26, 27. In this case, oil is supplied from an oil reservoir 6 to the compression room of each cylinder 12, 13 via an oil supply device 31. The oil prevents the temperature of the helium gas from rising as the helium gas is adiabatically compressed. The oil supply device 31 has a tank 35 disposed nearer to a rotary compression element 10 than an oil cooling heat exchanger 34, and the tank 35 is used to attenuate pressure pulsating wave of each compression room transmitted via oil filling the inside of a pipe 33, to thereby prevent the pipe from being broken by abnormal vibration of the oil cooling heat exchanger 34.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an improvement in a compressor that performs cooling by supplying oil to a compression element.

(Example) Conventional technology A conventional compressor cooling device is disclosed in, for example, Japanese Patent Application Laid-Open No. 1959-1959.
It is configured as shown in Publication No. 2. Here, a conventional example will be explained with reference to this publication. In FIG. 4, 50 is a rotary compressor, 51 is a four-way valve, 52 is an indoor heat exchanger, 53 is a pressure reducing device, and 54 is an outdoor heat exchanger, which are connected by piping to constitute a refrigeration cycle. There is. The rotary compressor 50 is composed of a closed container 56 having an oil reservoir 55 at the bottom thereof, and an electric element 57 and a rotary compression element 58 housed within the container. 59 is an oil supply device attached to the outside of the sealed container 56;
This oil supply device is composed of a pipe 60 that communicates between the oil reservoir 55 in the closed container 56 and the inside of the rotary compression element 58, and an oil cooling heat exchanger 61 provided in the middle of this pipe.

In the compressor cooling system having this structure, the oil in the oil reservoir 56 is cooled and supplied to the refrigerant in the middle of compression in the rotary compression element 58 by the oil cooling heat exchanger 61 of the oil supply device 59. This prevents the temperature of the refrigerant that is adiabatically compressed from rising abnormally.

(c) Problems to be Solved by the Invention However, the conventional oil supply device 59 is
Because the pipe is communicated with the rotary compression element 58, the pressure pulsations caused by the compression of the rotary compression element 58 are transmitted to the oil filling the pipe, vibrating the pipe 0 and the oil cooling heat exchanger 61, and causing noise. There were problems such as pipe breakage and pipe breakage.

The present invention solves the above-mentioned problems, and aims to provide a compressor cooling device that can damp vibrations of an oil supply device.

(d) Means for Solving the Problems This invention comprises a closed container having an oil reservoir in the bottom thereof, an electric element housed in the container, and a compression element driven by the electric element. A compressor comprising an oil supply device that cools and supplies oil in an oil reservoir into the compression element, the oil supply device comprising:
a pipe installed outside the closed container with one end opening into the oil in the oil reservoir and the other end communicating with the compression element;
It consists of a heat exchanger and a tank for heat radiation provided in the middle of this pipe, and this tank is provided closer to the compression element than the heat exchanger.

(f) Effect By having the above configuration, the present invention is provided with a tank in the oil supply device that supplies oil from the oil reservoir into the compression element, and the tank damps pressure pulsations generated in the compression element. The heat exchanger of the oil supply device vibrates to help prevent noise and pipe breakage.

(f) Examples The present invention will be explained below based on the examples shown in FIGS. 1 to 3.

1 is a rotary compressor, 2 is a main heat exchanger, 3 is an oil filter, 4 is a talion bomb, and 5 is a check valve, which are connected by piping to constitute a cryogenic refrigeration cycle. The rotary compressor 1 includes a closed container 7 having an oil reservoir 6 in which oil is stored at the bottom, and a rotating shaft 8 housed in the upper side of the container.
The rotary compression element 10 is housed on the lower side and is driven by the rotating shaft 8 of the electric element. The rotary compression element 10 includes an intermediate partition plate 11,
Cylinders 12.13 are installed above and below this partition plate, rollers 16 and 17 are rotated within this cylinder by an eccentric portion 14.15 of the rotating shaft 9, and suction chambers are formed inside the cylinders 12 and 13 in contact with these rollers. 1B, 19 and compression chamber 20.
21, vanes 22, 23, and cylinder 12.
13, and a cup muffler 26.2 attached to the upper and lower bearings.
It consists of 7. Intermediate partition plate 11 and cylinder 12
．． 13 is provided with a discharge hole 28 that communicates with the cup muffler 26 and 27.6 The rotation shaft 8 is provided with a rotary compression element 1.
An oil supply hole 29 is provided in the center for supplying oil to each of the sliding parts.

Also, an oil reservoir 6. is connected to an oil supply hole 29 at the lower end of the rotating shaft 8. An oil pickup 30 immersed in oil is provided. 31 is the cylinder 1 of the rotary compression element 10
2.13 is an oil supply device that supplies oil from the oil reservoir 6 into the cylinder 12.13.This oil supply device has one end opened into the oil of the oil reservoir 6, and the other end provided in the intermediate partition plate 11. A pipe 33 is connected to the injection hole 32 opening to the compression chamber 20.21 in the airtight container 7 and is attached to the outside of the closed container 7, and an oil cooling heat exchanger 34 and a tank 35 are provided in the middle of this pipe. It is made up of.

The tank 35 is provided closer to the rotary compression element 10 than the oil cooling heat exchanger 34, and has a pipe 33 connected to the oil cooling heat exchanger protruding inside.

36 is a first discharge pipe, and this first discharge pipe is connected to the rotary compression element 1.
0 discharge hole 28 and a space 37 between the electric element 9 and the rotary compression element 10 in the closed container 7 via an auxiliary heat exchanger 38 provided outside. 39 is a second discharge pipe attached to the earthen wall of the closed container 7, and this second discharge pipe is connected to the main heat exchanger 2. The main heat exchanger 2 and the auxiliary heat exchanger 38 are housed in a case 40. case 4
0 is provided with an inlet pipe 41.41 and an outlet pipe 42.42 for cooling water that separately cool the main heat exchanger and the auxiliary heat exchanger.

In the compressor cooling device configured in this way, the helium gas that has flowed into the cylinder 12.13 is
, 17 and the vanes 22, 23,
It is discharged into the cup mufflers 26 and 27. Also, the compression chamber 2 in the cylinder 12.13 compresses helium gas.
At 0.21, the oil in the oil reservoir 6 is transferred to the oil supply device 31.
Supplied via. This oil absorbs the temperature rise caused by the adiabatic compression of the helium gas compressed within the cylinders 12 and 13, thereby suppressing the rise in the temperature of the discharged gas. The helium gas in the cup muffler 26 and 27 is discharged from the discharge hole 28 to the first discharge pipe 36 and is heat exchanged with the cooling water in the auxiliary heat exchanger 38.
7. The helium gas flowing into this space passes through the electric element 9, and before being discharged from the second discharge pipe 39 to the outside of the closed container 7, oil contained in the helium gas is separated within this closed container. The separated oil returns to the oil reservoir 6, and the helium gas from which the oil has been separated is discharged from the second discharge pipe 39 and flows into the main heat exchanger 2. The high-pressure helium gas cooled by the main heat exchanger has residual oil removed by an oil filter 3, is brought to a cryogenic temperature by a cryopump 4, and is returned to the rotary compressor 1 through a check valve 5.

The oil supply device 31 is provided with a tank 35 closer to the rotary compression element 10 than the oil cooling heat exchanger 34, so that the oil that is filled in the pipe 33 is transmitted to the cylinder 12 of the rotary compression element 10 through this tank. .13 attenuates the pressure pulsating waves generated in the compression chamber 20.21,
This is to prevent the oil cooling heat exchanger 34 from vibrating abnormally and causing pipe bending. Also, tank 35
By projecting the pipe 33 connected to the oil cooling heat exchanger 34 from above into the interior, helium gas accumulates above the opening of the pipe 33 that projects inside, forming an oil layer and a helium gas layer. This makes it possible to further attenuate pressure pulsating waves.

By providing the tank 35 in the oil supply device 31, this invention damps the pressure pulsating waves generated in the rotary compression element 10, and the damage to the pipe 33 can be avoided without taking special measures against vibration in the oil cooling heat exchanger 34. It is designed to prevent

(g) Effects of the Invention As described above, according to this invention, the tank is provided near the compression element of the heat exchanger for heat radiation of the oil supply device that supplies cooled oil into the compression element. The pressure pulsating waves generated from the elements can be attenuated by the tank, thereby preventing the heat exchanger from vibrating due to the pressure pulsating waves and causing pipe bending.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration circuit diagram of a cryogenic refrigerator showing an embodiment of the present invention, Fig. 2 is a vertical cross-sectional view of the main parts of the rotary compressor, and Fig. FIG. 4 is a refrigeration circuit diagram showing a conventional example. 1...Rotary compressor, 6...Oil reservoir, 7...
Sealed container, 9... Electric element, 10... Rotating compression element, 31... Oil supply device, 33... Pipe, 34... Oil cooling heat exchanger, 35.
··tank.

Claims (1)

[Claims] 1. An airtight container having an oil reservoir at the bottom, an electric element housed in the container, a compression element driven by the electric element, and a compression element inside the compression element. In a compressor equipped with an oil supply device that cools and supplies oil in an oil sump, the oil supply device has one end opened into the oil in the oil sump, and the other end communicated with a compression element and sealed. It has a pipe attached to the outside of the container, and a heat exchanger and a tank for heat radiation provided in the middle of the pipe, and the tank is provided closer to the compression element than the heat exchanger. Compressor cooling system. 2. The compressor cooling device according to claim 1, wherein a pipe connected to the heat exchanger projects into the tank.