JPH03156255A - Herium gas compressor device - Google Patents

Abstract

PURPOSE:To provide a herium gas compressor capable of adjusting a differential pressure by a method wherein a capillary tube is arranged at one of branch passages in an oil return passage to connect an oil separator with a low pressure gas passage and an adjusting valve is mounted in the other branch passage. CONSTITUTION:A herium gas compressor device causes oil separated from an oil separator 5 placed in the midway of a high pressure gas passage 4 and a part of supplied gas in the high pressure gas passage 4 to flow into a low pressure gas passage 2 through the first branch passage 30 forming an oil return passage 7, a capillary tube 6 arranged in the second branch passage 31 and an adjusting valve 32. With such an arrangement, a differential pressure between a supplied gas in the high pressure gas passage 4 and the return gas in the low pressure gas passage 2 is determined by the capillary tube 6, adjustment valve 30 and a pressure holding valve 8. The differential pressure is adjusted in response to a degree of opening of the adjustment valve 32. When a herium gas compressing device is installed in a gas driving type herium freezer, the differential pressure is slightly varied to cause a driving force of the freezer to be decreased so as to enable a shock or a vibration generated in the freezer to be released.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a helium gas compression device used in a helium refrigerator, and particularly relates to a helium gas compression device used in a helium refrigerator, and in particular compresses supply gas supplied to the helium refrigerator and return gas returned from the helium refrigerator. The present invention relates to a helium gas compression device capable of adjusting the differential pressure of the helium gas.

(Prior Art) Generally, a helium gas compression device includes a compressor 1 that compresses helium gas, and a low-pressure suction side 1 of the compressor 1.
a is connected to the low pressure discharge side 3a of the helium refrigerator 3 via the low pressure gas path 2, while the high pressure discharge side 1 of the compressor 1 is connected to the high pressure discharge side 1 of the compressor 1.
b is connected to the high pressure supply side 3b of the helium refrigerator 3 via the high pressure gas path 4.

Further, an oil separator 5 is disposed in the middle of the high pressure gas path 4, and this oil separator 5 is connected to a capillary 6.
The low pressure gas path 2 is connected to the low pressure gas path 2 via the oil return path 7 having
It is connected to the.

Further, a path 9 provided with a pressure retaining valve 8 and a path 11 provided with a solenoid valve 10 are disposed between the low pressure gas path 2 and the high pressure gas path 4, and the path 9 is provided with a solenoid valve 10. The provided pressure holding valve 8 determines the differential pressure (braking pressure) between the pressure (high pressure) in the high pressure gas path 4 and the pressure (low pressure) in the low pressure gas path 2. That is, the differential pressure is determined based on the spring pressure of the preset spring applied to the pressure-retaining valve 8, and the high-pressure gas in the pressure gas path 4 is adjusted to maintain this differential pressure. Some of the
The low-pressure gas is configured to flow into the low-pressure gas path 2 via a path 9 provided with a pressure-holding valve 8.

On the other hand, in the path 11 provided with the electromagnetic valve 10, the electromagnetic valve 10 is switched from closed to open immediately after the device is stopped.
By increasing the pressure on the low-pressure discharge side 3a of the helium refrigerator 3, the oil in the oil separator 5 and the compressor 1 is prevented from flowing back to the helium refrigerator 3 through the low-pressure gas path 2. It is configured to prevent this together with the stop valve 12.

Furthermore, a pressure switch 13 monitors the pressure on the low-pressure suction side 1a and high-pressure discharge side 1b of the compressor, a thermostat 14 monitors the temperature of the gas in the high-pressure gas path 4, and a pressure gauge 15.1
6 is configured to monitor each pressure in the high pressure gas path 4 and the low pressure gas path 2, and the safety valve 17 is configured to monitor the pressure in the high pressure gas path 4 and the low pressure gas path 2.
It is configured to release the gas in the high pressure gas path 4 to the outside.

Note that helium gas used in the helium gas compression device configured as described above is supplied to the low pressure gas path 2 from the charge valve 18.

Next, the operation of the helium gas compression apparatus having the configuration as described above will be explained.

According to this helium gas compression device, the high-pressure helium gas compressed by the compressor 1 and directed to the oil mis 1 is compressed [
1 is supplied into the high pressure gas path 4 from the high pressure discharge side 1b,
The oil is cooled to room temperature via the cooling fan 19, passes through the compressor 1, cools the oil in the compressor 1, and is then cooled again to room temperature to pass through the oil separator provided in the middle of the high pressure gas path 4. It is supplied to the container 5.

The high-pressure helium gas in the form of oil mist supplied to the oil separator 5 is separated into high-pressure helium gas and oil, and the separated high-pressure helium gas passes through the high-pressure gas path 4 to the oil absorber. At 20, oil contained in the gas is further adsorbed and supplied to the high pressure supply side 3b of the helium refrigerator 3 (this supplied high pressure helium gas will be referred to as supply gas hereinafter).

Further, the above-mentioned supply gas is supplied to the low pressure gas path 2 from the low pressure discharge side 3a of the helium refrigerator 3 via the helium refrigerator 3.
(this returning helium gas is hereinafter referred to as return gas), is supplied to the low-pressure suction side 1a of the compressor 1 through the check valve 12 and strainer 21, and is compressed by the compressor 1 again to form an oil mist. It becomes high pressure helium gas.

On the other hand, the oil separated in the oil distribution separator 5 is supplied to the low pressure gas path 2 via the capillary 6 via the oil return path 7, and then to the compressor 1 via the strainer 21. Flows into the compressor 1 from the low-pressure suction side 1a.

Further, according to the pressure holding valve 8 that determines the differential pressure (braking pressure) between the supply gas in the high pressure gas path 4 and the return gas in the low pressure gas path 2, the spring pressure of the spring included in the pressure holding valve 8 is A part of the high pressure gas in the high pressure gas path 4 flows into the low pressure gas path 2 via the pressure holding valve 8 so as to maintain the differential pressure determined based on the pressure difference.

(Problem to be solved by the invention) However, in such a conventional helium gas compression device, the differential pressure (braking pressure) between the supply gas in the high-pressure gas path 4 and the return gas in the low-pressure gas path 2 ) is configured to determine the differential pressure based on the spring pressure of a preset spring included in the pressure retaining valve 8, and there is no means to adjust this differential pressure. The pressure was fixed, and it was structurally impossible to adjust the differential pressure from the outside.

Therefore, in the conventional helium gas compression device as described above, while the user is operating the device, the specifications regarding the refrigerating capacity of the helium refrigerator, which depend on the magnitude of the differential pressure, as shown in Fig. 3, and the helium gas compression It is not possible to meet the request to adjust the differential pressure of a helium gas compression device based on the power consumption of the device, and it is not possible to finely adjust the differential pressure, i.e. There was a problem in that a helium gas compression device that met the above requirements was required, and a negative device could not meet the above requirements.

In particular, in gas-driven helium refrigerators, vibrations and shocks occur depending on the size of the differential pressure.In order to alleviate these vibrations and shocks, helium refrigerators can be adjusted to reduce the differential pressure. There was an urgent need to develop a gas compression device.

(Means for Solving the Problems) The present invention has been made in view of two circumstances, and its purpose is to provide a helium gas compression device capable of adjusting differential pressure. In order to achieve the above object, the present invention includes a compressor that compresses helium gas;
A low-pressure gas path connects the low-pressure suction side of the compressor and the low-pressure discharge side of the helium refrigerator, and a low-pressure gas path connects the high-pressure discharge side of the compressor and the high-pressure supply side of the helium refrigerator, and an oil separator is connected along the way. and a pressure holding valve that determines the differential pressure between the low-pressure gas route and the high-pressure gas route, the oil distribution separator and the low-pressure gas route being connected,
an oil return path having a first branch path and a second branch path; a capillary disposed in the middle of one of the two branch paths; It was placed in the middle of the road.
The present invention is characterized in that it includes an adjustment valve that adjusts the differential pressure between the supply gas in the high pressure path and the return gas in the low pressure gas connection path.

(Function) The helium gas compression device of the present invention is capable of separating oil separated from an oil separator 5 provided in the middle of the high pressure gas path 4 and the high pressure gas path 4.
A part of the supply gas is transferred to the first oil return path 7.
The capillary 6 and the regulating valve 3 are caused to flow into the low pressure gas path 2 through the capillary 6 and the regulating valve 32 disposed in the branch passage 30 and the second branch passage 31.
The pressure difference between the supply gas in the high pressure gas path 4 and the return gas in the low pressure gas path 2 is determined by the 0° pressure holding valve 8,
This differential pressure acts to be adjusted according to the opening degree of the adjustment valve 32.

(Example) Hereinafter, a helium gas compression device according to the present invention will be explained in detail using FIG. 1.

Note that the same reference numerals are used for the same parts as in the prior art, and detailed explanation thereof will be omitted.

As shown in FIG. 1, the helium gas compression device of the present application connects a compressor 1 that compresses helium gas to one end of a low pressure gas path 2 and one end of a high pressure gas path 4 having an oil separator 5 in the middle. 1- The other ends of the two paths 2 and 4 are connected to the helium gas refrigerator 3, and a pressure holding valve 8 is provided between the two paths 2 and 4, and a solenoid valve is connected to the path 9. 10 is disposed in the same way as in the prior art, and a detailed explanation thereof will be omitted, and the configuration of the portion that is a feature of the present application will be described next.

In the helium gas compression device of the present application, the oil separator 5 and the low pressure gas path 2 are connected via an oil return path 7 branched into a first branch path 30 and a second branch path 31, and A capillary 6 is provided in the middle of the first branch path 30, and a regulating valve 32 is provided in the middle of the second branch path 31.
is provided, and the pressure difference between the supply gas in the high-pressure gas path 4 and the return gas in the low-pressure gas path 2 can be adjusted by the adjustment valve 32.

Next, the operation of the configuration of the characteristic parts of the helium gas compression apparatus configured as described above will be explained.

According to the helium gas compression device of the present invention, the oil separated by the oil separator 5 provided in the middle of the high-pressure gas path 4 and a part of the supply gas are transferred to the first branch path 30 provided with the capillary 6 and adjusted. The oil is supplied to the low pressure gas path 2 through an oil return path 7 consisting of two branch paths including a second branch path 31 provided with a valve 32 . As a result, the pressure in the high pressure gas path 4 decreases, while the pressure in the low pressure gas path 2 decreases by -1-
The differential pressure is adjusted to a differential pressure as shown in FIG.

Note that when the adjustment valve 32 is fully closed, the first branch path 30
Only a predetermined amount of oil is supplied to the low-pressure gas path 2 from the oil return path 7 through the capillary 6 provided in the oil return path 7.

What is shown in FIG. 3 shows that when the regulating valve 32 is fully closed, the reference value of the differential pressure is determined by the pressure holding valve 8 and the capillary 6, and as the regulating valve 32 is opened, the differential pressure becomes smaller. It is something.

Therefore, - [According to the helium gas compression device of the present invention, the oil separator 5 and the low pressure gas route 2 are connected in the middle of the high pressure gas route 4, and the branched first
an oil return path 7 having a branch path 30 and a second branch path 31; a capillary 6 disposed midway in the first branch path 30; By providing an adjustment valve 32 that adjusts the differential pressure between the supply gas in the high-pressure gas path 4 and the return gas in the low-pressure gas path 2, the adjustment valve 32 shown in - can be opened and closed from the outside to control the high-pressure gas path. 4 and the return gas in the low-pressure gas path 2 can be adjusted according to the opening degree of the adjustment valve 32, making it easy to fine-tune the differential pressure from the outside even during operation. The refrigerating capacity of the helium gas refrigerator, the power consumption of the helium gas compressor, etc. can be adjusted depending on the magnitude of this differential pressure.

In particular, when the helium gas compression device of the present invention is installed in a gas-driven helium refrigerator, the differential pressure can be changed to a small value to reduce the driving force of the refrigerator, thereby alleviating shocks, vibrations, etc. generated in the refrigerator. Can be done.

In this embodiment, the adjustment valve is provided in the first branch path, but this adjustment valve may be provided in the second branch path, and the capillary may be provided in the first branch path. Alternatively, a path having a pressure holding valve connecting the high pressure gas path and the low pressure gas path or a path having a solenoid valve may be branched and provided in the branch path.

(Effects of the Invention) The helium gas compression device according to the present invention connects the oil separator provided in the middle of the high pressure gas path and the low pressure gas path as described above, and also connects the first branch path and the second branch path. an oil return path that connects - a capillary that is located on one of the two branched paths and located in the middle; By providing an adjustment valve that adjusts the differential pressure between the supply gas in the route and the return gas in the low-pressure gas route, you can easily fine-tune the differential pressure by opening and closing the adjustment valve from the outside even during operation. The refrigerating capacity of the helium gas refrigerator and the power consumption of the helium gas compressor can be adjusted freely, so a single device can meet the various needs of the user, such as the refrigerating capacity and power consumption. be able to.

In particular, when the helium gas compression device of the present invention is installed in a gas-driven helium gas refrigerator, the differential pressure is changed to a small value to reduce the driving force of the refrigerator, and the shock generated in the refrigerator is reduced.
Since it is possible to meet the demand for alleviating vibrations and the like, it has the effect of expanding the range that can be handled by the device.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a helium gas compression device according to the present invention, Fig. 2 is a circuit diagram showing a conventional helium gas compression device, and Fig. 3 is a power consumption of the device depending on the differential pressure of the helium gas compression device. FIG. 2 is an explanatory diagram showing specifications of a helium refrigerator depending on , and differential pressure. 1...Compressor 1a...Low pressure suction side 1b...High pressure discharge side 2...Low pressure gas path 3...Helium refrigerator 3a...Low pressure discharge side 3b...High pressure supply side 4. ... High pressure gas path 5 ... Oil separator 6 ... Capillary = 7 ... Oil return path 8 ... Pressure holding valve 30 ... First branch path 31 ... Second branch path 32 ...・Adjustment valve

Claims (1)

[Claims] 1. A compressor that compresses helium gas, a low-pressure gas path connecting the low-pressure suction side of this compressor and the low-pressure discharge side of the helium refrigerator, and a high-pressure discharge side of the compressor and the above-mentioned A high-pressure gas path connected to the high-pressure supply side of a helium refrigerator and having an oil separator in the middle, and a pressure holding valve that determines the differential pressure between the low-pressure gas path and the high-pressure gas path, wherein the oil separation an oil return path that connects the vessel and the low-pressure gas path and has a first branch path and a second branch path; and a capillary disposed in the middle of one of the two branch paths. , an adjustment valve is provided on the other of the two branch paths and disposed in the middle thereof to adjust the differential pressure between the supply gas in the high pressure path and the return gas in the low pressure gas path. Helium gas compression equipment.