JPS59134396A - Compressor of helium gas - Google Patents

Abstract

PURPOSE:To enable an efficient compressing operation of helium gas by separating helium gas alone from an exhausted mixed gas by a selectively permeable film. CONSTITUTION:A mixed gas of nitrogen A and helium B exhausted by a disk 19 is introduced into a chamber 23. Only the helium gas B of this mixed gas is permeated through a selectively permeable film 24, and exhausted to the outside of the chamber 23 to be returned to a gas suction port 9 of a compressor 3 through a helium collecting route 25. The nitrogen gas A left inside the chamber 23 is exhaused to the outside of the chamber 23 via a check valve 27, and conducted to a gas exhaust port 6 via a driving gas exhaust route 26.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a helium gas compression device 1 that compresses helium gas by heating a compressor with a turbine.

In this type of helium gas compression device, a radial compressor is directly connected to a turbine that is rotated by a high-pressure driving gas such as nitrogen or neon through a common rotating shaft, and the rotational force of the turbine is used as a helium gas compressor. A system has been proposed in which the compressor is driven to compress helium gas.

However, with such a configuration, it is impossible to take complete shaft sealing measures, so a portion of the helium gas flowing inside the compressor may seal around the outer circumferential surface of the rotating shaft.
As a result, the amount of helium gas leaked from the turbine side and in the helium circulation system including the compressor may be increased by an unreasonable amount, or a portion of the driving gas in the turbine may contact the outer surface of the rotating shaft. This has the disadvantage that the helium gas enters the compressor side and reduces the purity of the helium gas.

However, in order to deal with this inconvenience, the turbine and the compressor are completely separated via a wall-shaped hermetic seal that blocks gas flow, and the power of the rotating shaft on the turbine side is completely separated. It has also been considered to provide a hermetic seal between the two and transmit the rotary axis of the compressor side through a single magnetic coupling.

However, such a structure has the disadvantage that large torque cannot be transmitted to the compressor side due to the limit of the strength of the magnet.

The present invention has been made in view of the above-mentioned circumstances. Drive gas leaking from the side along the rotating shaft and helium gas leaking from the compressor side along the rotating shaft 8 Exhaust means for sequentially removing from the periphery of the rotating shaft; a chamber containing a mixed gas of the driving gas and the helium gas, and a selectively permeable membrane that selectively permeates only the helium gas in the mixed gas introduced into the chamber and guides it out of the chamber; By providing a helium gas recovery system for recovering the helium gas that has passed through this selectively permeable membrane, and a driving gas derivation system for leading out the driving gas remaining in the chamber to the outside of the chamber, baiting can be achieved.
It is an object of the present invention to provide a helium gas compression device having fζ so as to completely eliminate these inconveniences.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a helium gas compression device 1 according to the present invention. As shown in this drawing lζ, this helium gas compression device 1 has a turbine 2 and a compressor 8 directly connected via a common rotating shaft 4. The turbine 2 has a gas inlet 5 on the outer circumference and one end on the center part l.
ζ gas derivation rotor 67/1 impeller 8 in the engine 7? This impeller 8 is supported by one end of the rotating shaft 4. Then, a driving gas such as high-pressure nitrogen gas A is supplied from the gas inlet 51ζ and a high-pressure gas outlet (not shown), and the pressure of the nitrogen gas A is used to rotate the impeller 8 at high speed. In addition, the compressor 3 has one end in the center, a gas suction port 97r, and an outer peripheral part It.
If Suotaro 1o-5- casing 111
A 51-piece impeller 12 is rotatably housed therein, and this impeller 12 is supported on the other end of the rotating shaft 4. Then, the gas suction port 91 has low pressure helium gas B.
I am trying to guide you through this process. Note that the rotating shaft 4 is connected to the block 1 that integrally connects both the casings 7.11.
In this block 14, there are radial gas bearings 15, 15 and fast gas bearings 16 and 16, which support the rotating shaft 4 in a flow state. Gas bearings 15.15 and 1i- are paired with labyrinth seals 17.18 and pt+.
It is.

Then, a disk 19 serving as an exhaust means is integrally protruded and recessed into an intermediate portion of the rotating shaft 4, that is, a portion located between both the labyrinth seals 17 and 18, and this disk 19 is connected to the turbine 2 side. The nitrogen gas A leaking from the compressor 3 along the rotating shaft 4 and the nitrogen gas B leaking from the compressor 3 side along the rotating shaft 4 are successively removed from the vicinity of the rotating shaft 4. To be more specific, the disc 19 is a flange-shaped member that protrudes from the outer circumference of the rotating shaft 4, and has spiral grooves 21 on both end faces thereof as shown in FIG. is engraved so that nitrogen gas A and helium gas B leaking along the rotating shaft 4 can be discharged in the outer radial direction due to centrifugal force J.

The mixed gas of nitrogen gas A and helium gas B, which is removed from the vicinity of the rotating shaft 4 by this disk 19, is introduced into the chamber 28 through the boat 22. One side wall of the chamber 23 is formed by a selectively permeable membrane 24 rc that can selectively transmit only helium gas B, and the helium gas B in the mixed gas introduced into the chamber 28 is passed through the selectively permeable membrane 24 rc. 24 to lead out of the chamber 23. Further, when the helium gas B that has passed through the selectively permeable membrane 24 is returned to, for example, the gas suction port 9 of the compressor 8 via the helium gas recovery line 25, the nitrogen gas A remains in the chamber 23. For example, the gas is returned to the gas outlet port 6 of the turbine 2 via the driving gas outlet line 26. This drive gas derivation system 261 is provided with a check valve 27, and the gas pressure in the chamber 28 is increased by the check valve 27 and the exhaust force of the disk 19, and the selective permeation of the helium gas B is performed. It is strained to improve the transmittance through the membrane 24. Further, an auxiliary disk 28 is provided protruding from a portion of the rotating shaft 4 closer to the turpin 2 than the disk 19. The auxiliary disk 28 has the same structure as the disk 19, and is mainly designed to exclude nitrogen gas A leaking from the turbine 2 side along the rotating shaft 4 from around the rotating shaft 4. It has become.

Then, the nitrogen gas A removed by this auxiliary disk 28 is passed through the check valve 29 to the drive gas lead-out line 25.
Strain to release the liquid.

Next, the operation of this embodiment will be explained.

High pressure nitrogen gas A is introduced into the turbine 2 from the gas inlet 5.
When this is introduced, the blades of this turbine 2! , 8 rotate at high speed, and the impeller 8 is rotated in pairs with 13 forces.
Therefore, the expanded nitrogen gas A/ is sequentially discharged to the outside of the turbine 2 through the gas outlet 61F.

In this way, when the impeller 8 of the turbine 2 rotates,
The rotational force is transmitted to the impeller 12+ζ of the compressor 3 via the rotating shaft 4, and the impeller 12 rotates at high speed. Therefore, the helium gas B introduced into the compressor 8 through the gas suction port 9F is transferred to the impeller 1.
The helium gas Bl, which is compressed by 2+ and becomes high pressure, is discharged from the gas discharge port 10.

Helium gas B can be compressed using Ir-j as described above, but in this device, the turbine 2 and compressor 8 are directly connected via the rotating shaft 4, and the labyrinth seals 17 and 18 alone cannot completely compress the helium gas B. A perfect shaft seal is impossible.

Therefore, a part of the nitrogen gas A flowing through the turbine 2 flows along the outer peripheral surface of the rotary shaft 4 toward the compressor 3, passes over the labyrinth seal 17 on the turbine 2 side, and reaches the auxiliary disk 28 disposed portion. And auxiliary disk 281
The nitrogen gas A that has reached this point is guided by a spiral groove provided on the end face fζ of the auxiliary disk 28, and is expelled outward by centrifugal force. The nitrogen gas A removed from the auxiliary disk 28t is discharged through the check valve 29 into the drive gas outlet line 26, and is returned to the waste outlet 6 of the turbine 2 through the thread line 26. Note that a part of the nitrogen gas A that has reached the auxiliary disk 28 is not discharged via the check valve 29, but bypasses the auxiliary disk 28 and reaches the adjacent disk 19 installation portion. - A part of the helium gas B flowing through the compressor 8 flows along the outer peripheral surface of the rotating shaft 4 toward the turbine 2, crosses the labyrinth seal 18 on the compressor 3 side, and passes through the disk 1.
It reaches up to 9 installation parts. In this way, the nitrogen gas A and helium gas B that have reached the disk 19 are guided by the spiral grooves 21 provided on both end surfaces of the disk 19, and are guided around the rotating shaft 4 by centrifugal force. be excluded from Therefore, the nitrogen gas A removed from this disk 191
A mixed gas of helium gas B and helium gas B is introduced into the chamber 28 through the boat 22. When the mixed gas is introduced into the chamber 28, only helium gas B in the mixed gas passes through the selectively permeable membrane 24 and enters the chamber 23.
The gas is led out and returned to the gas suction port 9 of the compressor 8 through the helium gas recovery line 25. Further, the nitrogen gas A remaining in the chamber 28 is removed by a check valve 277.
The gas is discharged out of the chamber 23 through the drive gas outlet line 26 and guided to the gas outlet port 6 of the turbine 2.

However, with this type of system, the helium gas B that leaked out of the compressor 3 along the rotating shaft 4 can be recovered to the compressor 8 side without contaminating the nitrogen gas A. It is something.

Note that the driving gas for operating the turbine is, of course, not limited to nitrogen gas, and may be, for example, ion gas, argon gas, or air.

Furthermore, it goes without saying that the exhaust means is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention.

Furthermore, the configuration of the helium gas recovery system is not limited to that of the embodiment described above; for example, an adsorbent container may be provided at the helium gas outlet to further improve the purity of the helium gas to be recovered. , various modifications are possible.

Further, the drive gas derivation line is not limited to the one shown in the illustrated embodiment, but may be, for example, a channel in which the remaining drive gas is drained into the atmosphere. Good too.

The present invention has the above-mentioned configuration, and the following effects can be obtained.

Since the mass, turbine, and compressor are directly connected via the rotating shaft, it is possible to transmit a large torque from the turbine (1rII) to the compressor.

In addition, an exhaust means is provided at the middle part of the rotating shaft, and the driving gas leaking from the turbine side and the gas leaking from the compressor side are both removed from the periphery of the rotating shaft, and the removed mixture The IC is designed to separate only helium gas from the gas using a selectively permeable membrane.
However, it is assumed that the separated helium gas can be recovered to the compressor side.
In fact, it is possible to extremely reduce the amount of helium gas that leaks to the outside and is thrown away, allowing efficient helium gas compression operation.

Furthermore, with this type of compressor, there is no fear that the driving gas will enter the compressor side, so there will be no inconvenience that the purity of the helium gas to be compressed will be reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing an exhaust means portion of the same embodiment. 1... Helium compression device 2... Turbine 8... Compressor 4... Rotating shaft 19... Exhaust means (disk) 28... Chamber 24... Selective perms membrane 25... Helium Gas recovery system line 26... Drive gas derivation line A... Drive gas (chip gas) B... Helium gas agent Patent attorney Hiroshi Akazawa

Claims (1)

[Scope of Claims] (1) A helium gas compression device in which a turbine rotated by being energized by a high-pressure driving gas and a compressor that compresses helium gas are directly connected via a common rotating shaft, Provided at an intermediate portion of the rotating shaft, the driving gas leaking from the turbine side along the rotating shaft and the helium gas leaking from the compressor side along the rotating shaft are removed from the vicinity of the rotating shaft. an evacuation means for sequentially removing the helium gas from the exhaust gas; a selectively permeable membrane that allows the helium gas to permeate and guide it out of the chamber; a helium gas recovery line that recovers the helium gas that has passed through the selectively permeable membrane; and a driving gas outlet that leads out the driving gas remaining in the chamber to the outside of the chamber. A helium gas pressure-like device characterized by comprising a system line. (2) The lithium gas according to claim 1, characterized in that the gas pressure in the chamber can be increased by the exhaust force of the exhaust means. Compression device. (8) The helium gas according to claim 2, characterized in that the exhaust means is a disk that protrudes from the outer periphery of the rotating shaft and has a spiffle-shaped groove on one end surface. Compression device.