JPS59167659A - Cryogenic cooling 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] This invention relates to an extremely low temperature cooling device.

A conventional device of this type is shown in FIG.

In the figure, 11) is the liquid nitrogen tank, (2) is the liquid nitrogen, (3) is the 1st temperature feed pipe, ``(3a) is the @a feed/ig outlet, and (4) is the cryogenic container with an insulated structure. Fly Osfoot.

(5) is '1 set plan gas outlet, (6) is nitrogen gas, (7
) is the temporary cooling body, (7a) is the upper part of the cooled body, (7b)
is the lower part of the object to be cooled.

The arrows indicate the direction in which the four branches flow.

In addition, Fig. 2 shows the temperature changes in each part inside the fly-oss foot (4), with the vertical axis as an absolute once scale and the @ axis as a weekly time scale. The temperature waveforming gold 9 curve B at the pipe outlet part (3a) is the first
Curve C shows the temperature change at the upper part (7a) of the object to be cooled in FIG. 1.

Next, the operation will be explained.

Generally, in cryogenic equipment, the temperature inside the cryostat (4) that houses the object to be cooled (7) ranges from normal temperature (approximately 3QOK) to extremely low temperature using liquid nitrogen! When cooling each time (approximately 80K), the liquid nitrogen tank is the liquid nitrogen stored inside the tank +21 total J? This is done by pouring it into the cryo-stan 141 little by little via the heating pipe (3) of J'4Jt1 to cool it down excessively.

The injected liquid nitrogen is discharged from the outlet (3a) of the transport pipe to the bottom of the cryostat (4) and completely cools the surrounding area and the object to be cooled (7), so that it does not directly evaporate and becomes scum (6). ) Tonashi 1. (The gas is released into the atmosphere from the gas release port (5).

In the conventional design, IIη is configured as described above, so
Cooling is achieved by directly utilizing the latent heat and sensible heat held by the liquid. ``At this time, the temperature of each part inside the cryostat (4) changes as shown by the curve in FIG. 2.

In other words, the temperature at the exit part (3a) of the transport pipe drops rapidly as shown in Figure 1.
) is like tt44 Mori B, ・田if) is also a little behind A, and it is also a sharp decline in 11i. - The upper part (7a) of the stress relief cooling body is curved M, r+1. As in C, the temperature decreases slowly.

For this reason, during cooling, a large temperature difference will occur inside the actuated body (7), and there is a risk of sagging due to the fish-centered force. It was difficult to control and monitor all groups.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above. Pressure is set to KdM using a low-temperature container and a gas pressure machine, and the compressed gas is cooled in a cooler installed in the liquid tank in the nitrogen storage chamber, and the cooled 4-song gas is transferred to the above-mentioned electrode. The temporary cooling body is cooled by discharging it into a low-temperature container, and the above U: If! cooling means for the object to be cooled, which compresses the nitrogen gas recovered from the valley vessel and a part of the nitrogen gas in the nitrogen storage chamber with the compressor and sends the compressed air to the cooler again for circulation; M
By including a heat exchanger installed in the nitrogen gas in the room and exchanging heat between the nitrogen gas sent from the compressor to the cooler and the nitrogen gas having cold heat, the cold heat can be effectively used. It is used to completely cool the object to be cooled.

The purpose is to reduce the temperature difference inside the object to be cooled and prevent cracking due to black stress.

Hereinafter, one embodiment of this invention will be used based on the drawings.

Figure 3 shows an ultra-low η hanging cooling system If + fully shown in Figure 9, which is an example of this L Ming Ichiten cooling system. The nitrogen sludge pipe connected to the nitrogen gas discharge port (5) of the middle stat (41), (13) is the compression ψ (Il
) compressed nitrogen song gas? Nitrogen gas discharge pipe thrown into liquid nitrogen to send to cooler (+7), (+51 is cooler Q7) to transport cooled nitrogen gas to gold cryostand (4) with adiabatic structure tube, (15
a) is the low-temperature nitrogen gas/feedback pipe outlet, (+6) is the discharge port that releases excess evaporated nitrogen gas in the nitrogen storage room (lO), This is a two-channel heat exchanger that exchanges heat between the nitrogen gas being sent and the excess nitrogen gas having cold energy released through the outlet (16).

In addition, in this example, a normal flow PA (11), a nitrogen gas discharger (new F121), a nitrogen gas discharge pipe (+31.
J, low-temperature gas transport pipe (15) and cooler H constitute a complete cooling system.

Next, the operation (( will be explained. First, the liquid chamber f tank (
1) Liquid nitrogen f21'i stored inside.

It is sent to the specified level in the Sagi Sod storage room (lO) via the '+M feed pipe (3) with a one-nail thermal structure. Afterwards pressure 41:%
4・d to) -, operate the nitrogen storage room (10)
Inject 1* through the circular nitrogen gas (6) total equal pressure 'i# +14). The nitrogen gas whose pressure has increased by increasing the pressure 8 times is transferred from the nitrogen gas discharge pipe (13) to the two-channel heat exchanger (18).
), and is led to a cooler (1), where it exchanges heat with the surrounding liquid nitrogen 12).

The liquid nitrogen is cooled to a temperature of 80 K) and is discharged to the bottom of the flywheel foot (4) through a low-temperature gas transport pipe (15) near the center of the city, cooling the entire interior. That howl.

From the 4-gas discharge port (5), the gas is returned to the compressor (11) via the country and is compressed and circulates through the [1゛] loop. Gara nitrogen storage! 10
), the nitrogen gas is generally at room temperature; if the temperature is higher than room temperature, the anastomosis is cooled by a blower (not shown).

On the other hand, the 7g of Mi scum (6) emitted inside the liquid nitrogen reservoir [iol] lost 1 replacement heat through evaporation, and
1 degree has hardly increased, and if you use this Deng Yan to the hundredth point, you can reduce the consumption type of Liquid Bon Purple.

Take the evaporated nitrogen gas (6), 2 L7iE
:, [If all the secondary side of the Dai-type Yanchi evaporator (18) is discharged into the atmosphere from the black wall element gas i outlet (16), - next ヲυ1 compression will be achieved. The nitrogen scum discharged from the machine (11) can be constantly cooled.

The pressure equalization pipe (14) is used to supply nitrogen gas necessary for the operation of the pressure shaft machine (11) and to cool the inside of the fly-oss foot (4). ';: This is for replenishing the nitrogen gas that is shrinking.

The fifth example shows another embodiment of the present invention, in which the heat exchanger is a 27-hour cross section (18
) is used instead of 31 Ruj vulgar type Tame conjunctive word (19). Nitrogen and 1 SECAS ash pipe from Bota and Flyosfoot (4) (insulated 1B construction, 3 channel heat exchanger 1, i;
(After cleaning the entire secondary side of 191, the pressure is low and the pressure is low), so I removed the slag (6) from the nitrogen storage room (10).

- Order λ+IL flowing on the next side: Part of the waste discharged from the machine (11) can be completely cooled.

A three-channel heat exchanger like this (19)
If sound is used, it can be used for cooling and heat more effectively than the two-channel type (18).

4th. Figure 6 shows the Flyos foot (
4) represents the reverse change r of each part inside 9
Curves A, B, and O indicate the temperature changes at the outlet (15a) of the low-temperature gas pipe, the lower part (7b) of the object to be cooled, and the upper part (7a) of the object to be cooled, respectively, in FIG. As is clear from this figure, even during cooling, the temperature difference between the upper part (7a) and the lower part (7b) of the object to be cooled (7) is small, so there is less concern about 10% 2t, etc., and the cooling speed is reduced. There is no need to control or monitor the amount of distortion, making the operation easy.

As described above, according to the present invention, 1.1 is comprised of a nitrogen storage chamber for storing body oxygen 2 and nitrogen gas, a cryogenic container storing a temporary production body, and a nitrogen gas total pressure of 9. Nitrogen gas R, J: Liquid in storage chamber M (cooled with a cooler installed in #).

All of the cooled nitrous gas is released in the cryogenic container (A) above,
While cooling the above object to be cooled, the above 1:1 (nitrogen gas recovered from the hot container, a part of the nitrogen scum in the above-mentioned red storage room, and the total above pressure) is compressed with a fliJ machine and sent to the above cooler. The above grade to be sent and circulated? ``Means for cooling the body, and nitrogen gas that is provided in the purchased yarn gas in the nitrogen storage room and sent from the compressor to the cooler and the nitrogen gas that provides cold heat. And the heat exchanger provided? Since it is prepared, the cooling body can be effectively utilized] and the object to be cooled can be cooled.
It is possible to reduce the temperature difference inside the upper self-cooled body and prevent cracking due to swallow stress.

[Brief explanation of the drawing]

The first figure is a cross-sectional diagram showing the conventional cryogenic cooling device φ, and the second figure is a curve diagram showing humidity changes in each part inside the container in the conventional device shown in FIG. Fig. 3 is a cross-sectional configuration diagram showing an ultra-low 7 m cooling device according to part of the present invention, and Fig. 4 is a curve diagram showing humidity changes in each part inside the cryogenic container in the device of Fig. 3. , 5th
The reason is that 4 total low temperature cooling equipment according to other embodiments of the present day.
? Cross section 1 shown: , ) diagram, Figure 16 is the device d in Figure 'A'5.
K setting/image low temperature, 1! It is a curve diagram showing the humidity change inside the container for each 1jls minute 0'). In the figure, (l) is liquid nitrogen tank, (2) is liquid nitrogen, (3) is ll61 pipe, (4) is cryogenic container, (6
) is nitrogen gas, (7) is cooled I4C, (10) is electrolytic storage M chamber + (11) 01 pressure, 1ilJ Sakura, il force is nitrogen meso gas pipe, (13. is nitrogen Gas discharge pipe, (
141 is a pressure equalization pipe, (15) is a low-temperature waste RA pipe, (
lη is a cooler, (18), '(+9) is a heat exchanger, in the English example. 1f Kinatsuki (11), nitrogen gas ash pipe, nitrogen concentrated gas discharge pipe (13+, uniform LF pipe +14) + low temperature gas conveyance;
(15) and the cooler j171 constitute a cooling means. Note that the same reference numerals in Figure 1 indicate the 13th minute of the first round. Agent Kuzuno ig - Fig. 1 Fig. 2 Ichiharuma Fig. 3 Fig. 4 Fig. 11 Era Fig. 6 Fig. 6-8 Lock

Claims (2)

[Claims] (1) A cryogenic container that stores liquid nitrogen, a nitrogen storage chamber containing V gas, and a cooling body. The compressed gas is compressed by a compressor, and all of the compressed nitrogen gas is cooled in a cooler installed in liquid nitrogen in the nitrogen storage chamber, and then released into the cooled gas chamber above-1. Then, the object to be cooled was cooled and recovered from the hot trough. , a means for cooling the body to be cooled, which compresses the gas and a part of the four-element gas in the nitrogen-purple storage silkworm with the compressor and sends it again to the cooler for circulation; and the nitrogen storage chamber. A cryogenic cooling device equipped with an exchanger which is installed in the ion gas and exchanges heat between the moss scum sent from the pressure gallery machine to the cooler and the nitrogen gas which is full of cold and heat. (2) The cryogenic cooling device according to claim 1, wherein the nitrogen scum that impairs cooling is nitrogen gas exhausted from the nitrogen storage chamber. +31 The cryogenic cooling device described in Section 1 or Section 2 of Patent No. 6, in which the nitrogen gas having cold energy is nitrogen gas recovered from a cryogenic container.