JPS5981461A - Helium compression device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a helium compression device used for pressurizing helium gas.

Conventionally, when pressurizing helium gas, helium gas at room temperature is compressed using a piston-type or screw-type compressor.

However, this type of compressor is unreliable due to link wear and oil contamination with the helium gas, and special equipment is required to remove oil from the helium gas after compression. There may be some inconveniences.

One possible solution to this problem is to compress helium gas using the radial compressor 1. However, helium has an extremely small molecular weight. Therefore, in order to compress helium gas sufficiently by one radial compressor, the impeller of the radial compressor must be rotated at such a high speed that its circumferential speed approaches the speed of sound. However, when the impeller is rotated in such an 8-speed rotation, a large centrifugal stress is applied to the impeller fζ, and an impeller made of a practical material cannot be used for a long period of time due to its strength. The problem arises that it cannot withstand

The inventor of the present invention has carried out research to address these problems and has found that the above-mentioned disadvantages are caused by the fixed idea that it is common sense to compress helium gas at room temperature. One thing that bothered me was that it was caused by the situation. In other words, the speed of sound can change in proportion to the square root of the absolute humidity.For example, if helium gas is cooled to a required temperature C, then a radial compressor First, it was discovered that a high compression ratio can be achieved without applying excessive centrifugal stress to the impeller of the compressor. Moreover, it has been found that such a deviation can reduce the volume of helium gas, which reduces the volume of the helium gas. We provide an innovative helium compression device that is highly reliable, does not mix oil into the helium gas, has a compact configuration, and can achieve a high compression ratio. It is something to do.

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

Invention 1 This helium compression apparatus, as shown in FIG. The radial compressor 17 is provided with a drive means 3 for rotationally driving and compressing the helium gas A introduced into the compressor II. The low-temperature helium supply system 2 is, for example, interposed between a helium gas supply path 4 and a helium gas A? Liquid nitrogen B, near liquid nitrogen temperature l
It is equipped with a multiple heat exchanger 5 for cooling down to a maximum temperature.

FIG. 2 is a sectional view specifically showing the radial compressor 1 and the [lltlJ means 3]. The radial compressor 1 includes an outer box 8 having an inlet 6 at the center of one end face and an outlet lower, and an axial center E inside the outer box 8. ], a cylindrical inner box 11 having a pop chamber 9fP facing the inlet 61 at one end; an impeller 12 accommodated in the pop chamber 9 of the inner box 11; Box 11F'3 + Koradia kjJ
It is rotatably housed through the sl1tl bearing 1 B, 18 and the sufst gas bearing 147T, and at one end 11
The rotating shaft 15 supports the impeller 12.

Then, between the inner periphery of R1 and the outer periphery of the inner box 11, high-pressure helium gas A/ fP
A gas circulation space 16 is formed to guide the outflow lower I. However, this radial compressor 1
The inlet 6I is connected to the terminal end of the helium gas supply path 4, and the outflow lower I is connected to the compressor 1.
The starting end of a high-pressure helium guide path 17 that guides high-pressure helium gas A/ discharged from the helium gas A/ to an appropriate helium utilization system (not shown) is connected thereto. In addition, the inner box I
A flange 18 is formed on the outer periphery of the lower end of I, and the outer periphery of this flange 18 is hermetically fitted to the inner periphery of the open end of the outer box 8 via a seal link 19. Here, 21 is a boat for guiding the high pressure helium gas A' in the gas circulation space 16 yen to each gas bearing 13, (2) 3.14. On the other hand, the driving means 8 includes a turbine 22 which is operated by being energized by high-pressure nitrogen gas C+, and the operating force of this turbine 22? 4i1 radial compressor
+ a transmission mechanism 23 for transmitting the information. The turbine 22 includes an outer box 26 which has an inlet 24 on the peripheral wall, an outlet 25 at the center of one end face, and an axial center f in the outer box 26. 1 Outlet 2
A cylindrical inner box 28 having a terpino chamber 27 facing 5+, an impeller 29 housed in the turbine chamber 27 of this inner box 28, and an oil-indicated inner phase 28 with a radial gas bearing 8.
1.81 and a rotating shaft 33 which is rotatably housed via a Sufst gas bearing 82 and supports the impeller 29 at one end.
It becomes like this. Then, between the inner part of the #JiJ outer box 26 and the outer periphery of the RIU inner box 28, nitrogen scum C under direct pressure was provided from the inlet 24 to the inner box 28+. A gas circulation space 3 that guides the inside of the turbine chamber 27 through a 244-person boat (not shown).
4 is formed 1st. ing. l/Kashite, Jin's Turbine 2
90] On the inflow day 24, the working gas supply line 35 for supplying low-temperature high-pressure nitrogen gas C77 is connected, and the diversion port 25+ is connected to the
; Δ means 1 kfr thermal expansion and t nitrogen gas 0'
1b JJ Gas UF tB Road 3
Also - is connected. A flange 87 is formed on the outer periphery of the other end of the #1 inner box 28, and the outer periphery of the flange 37 is connected to the outer periphery of the inner box 28 through the seal link 38.
26 Q) 1 [10 End inner periphery L and airtight fit C
I'm there. The open end of the outer box 26 of the turbine 29 and the open end of the outer box 8 of the radial compressor 1 are joined by bolts or the like in abutted state 74:t. Here, 39 is t3U gas circulation space 34
Ail the high-pressure nitrogen gas inside each gas supporter 81, 81, 8.
Look at the boat that takes you to 2. -10,000, said transmission groove 28
These include a partition wall 41 that airtightly isolates the radial compressor 1 and the turbine 22, and a magnetic coupling 42 that transmits the power of the rotating shaft 83 of the turbine 22 via the partition wall 41 to the rotation M15iζ of the radial medium compressor 1. It is composed of. The partition wall 41 includes seal members 4B, 48 between the flange 18 on the radial compressor 1 side and the flange 87 on the turbine 22 side.
A ring-shaped flat plate portion 41a is airtightly held between the ring-shaped flat plate portion 41a and a cup-shaped expansion portion that integrally protrudes from the inner peripheral edge of the flat plate portion 41 and surrounds the extending end 888ft of the rotating shaft 38 of the turbine 22. The protruding portion 41b is made of ceramic, GFRP, or the like.

The bulging portion 411 of the partition wall 41 and the extending end portion 88B of the rotating shaft 8B are loosely fitted into the axial hollow portion t5a of the rotating shaft 15 of the radial compressor 1. Further, the Macabbuto cup link 42 has a permanent structure in which one north pole and eight poles are alternately exposed in the circumferential direction on the inner circumference of the rotating shaft 150 which serves as a yoke. In addition to providing the magnet 42B, it serves as a yoke.
Permanent magnets 42b are provided on the outer periphery lζ of the extending end 88B of the recording and reporting rotation shaft 83, and on the outer peripheral surface l, N poles and 84 flowers are alternately exposed in the circumferential direction. The number of poles of both permanent magnets 42a2b is set to be equal to l.

The radial compressor 1, the main parts of the low-temperature helium supply system 2, and the driving means 8 are housed in an insulated box whose interior is kept at a low temperature.

Next, the operation of this device will be explained.

When low-temperature, high-pressure nitrogen gas C is introduced into the turbine 22 through the working gas supply path 35, the impeller 29 of the coupinot 22 rotates at high speed, and by energizing the impeller 29, The adiabatic, low-pressure nitrogen gas C is sequentially discharged through the working gas discharge passage 86. and,
The rotational force of this impeller 29 is transmitted from the rotating shaft 33 to the magnetic force link 42 to the rotating shaft 15 to the radial compressor 1.
The power is transmitted to the impeller 12 in this order, and the impeller 12 rotates at high speed. At this time, the rotating shaft 33 supporting the impeller 29 of the atl turbine 22 is mounted on a gas bearing 81.81.
．． The rotating shaft 15 which supports the impeller 12 of the radial compressor 1 and is supported by the nitrogen gas C introduced therein is supported by the gas fIII receiver 18.18.14 + the helium gas A/I introduced therein. be done. In this way, radial compressor 1 is put into operation.
Then, when the low-temperature helium supply system 2 is led to the inlet 6 of the compressor 1, for example, low-temperature helium gas A7i cooled to 80° to the culm, this helium gas A flows through the conopret → 11. Helium gas A' which is compressed by the impeller 12+ and becomes high pressure is led out through the gas circulation space 16'r. The high-pressure helium gas A/ guided from the outflow lower 1 is fed through the high-pressure helium channel 17 to an appropriate helium utilization system 1 for use.

Note that the low-temperature helium supply system is, of course, not limited to that of the illustrated embodiment, and may be any type of system that can sequentially supply four-temperature helium gas 7i. It goes without saying that the configurations of both means are not the same as those of the previous embodiments, for example, a high frequency motor or a combination of a motor and a motor. ) may be used, and the drive means may be of the turbine type.
Even in this case, various modifications are possible, such as using neon, dry air, natural gas, water/wood, oxygen, or other inert gas as the working gas for energizing the turbine. Further, the configuration of the transmission (Q structure) is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention.

Since the present invention has the configuration as shown below, fCj has the following OJ effect.

In other words, since the helium gas is strained to a pressure of 92I using a radial comb 17 saucer, it is possible to eliminate the inconvenience of causing wear of the piston ring and the inconvenience of oil getting mixed into the helium gas. −+, the reliability of the position can be increased.

Moreover, since the speed of sound is proportional to the square root of the absolute temperature, the helium gas turns into ash, so as in the present invention, a radial compressor is introduced to compress the helium gas after it has been cooled to the required temperature. Rubbing allows a high compression ratio to be achieved without imposing excessive centrifugal stress on the compressor's impeller.

In addition, in order to introduce helium gas into the combrella → J in a low temperature state, the volume of the helium gas can be kept relatively small, and it is possible to make the device more compact. can.

However, as in the above embodiment, the driving means is of a turbine type, and the rotational speed and power limit can be greatly increased compared to a 1G motor such as a rope frequency motor, and the configuration is simple.
This results in the effect that higher compression performance can be achieved. Moreover, if a gas having a ground temperature corresponding to the temperature of the helium gas introduced into the radial compressor I is used as the working gas, the turbine and the radial compressor are placed in close proximity as in the illustrated embodiment. There is no fear that undue heat will be applied to the helium gas from the outside even during the previous compression, and the helium gas can be compressed easily in a low-temperature atmosphere.

Furthermore, 114 is a region in which helium gas flows according to the above-mentioned embodiment O. (However, it is possible to completely isolate the area where 1'111 scum flows. At that time, helium gas leaks to the outside and 1 gas is mixed into the helium gas.) (b) It is possible to reliably prevent such inconveniences.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention, and Figure El 1 shows the entire fo
p Not shown Jl'j Schematic explanatory drawing, FIG. 2 is a sectional view showing the radial compressor 16 and the tossing means.
... Radial compressor 2 ... 11℃ warm helium supply system 3 ... Drive means 6 ... l+iF, inlet 22 ... Turbine 23
..., (l之!bha4iitfI'Y
4 1... Bulkhead 42... Sotokatsuburinoku Maksho's agent Patent attorney Hiroshi Akayo

Claims (3)

[Claims] (1) A radial compressor, a low-temperature helium supply system that supplies hot and low-temperature helium gas to the inlet of the radial compressor, and a low-temperature helium supply system that supplies hot helium gas to the radial compressor, which is introduced into the compressor by rotationally driving the radial compressor. A helium compression device comprising a drive means for compressing helium gas. (2) The driving means is comprised of a turbine that rotates by being energized by direct pressure gas Ic, and a transmission mechanism that transmits the rotational force of the turbine to the radial compressor I. A helium compression device according to scope 1. (3) The transmission mechanism includes a partition wall that airtightly isolates the radial compressor and the tank, and a magnetic coupling that transmits the power of the rotating shaft of the turbine to the rotating shaft of the radial compressor via the partition wall. A helium compression device according to claim 2, characterized in that it is comprised of: