JPS59144898A - Vacuum adiabatic container - Google Patents

Abstract

PURPOSE:To prevent the adiabatic performance from deteriorating during a long time use by providing a vacuum meter on a vacuum adiabatic container and detecting a vacuum down in a space formed by an innercontainer and an outer container to operate a vacuum valve. CONSTITUTION:A vacuum meter 16 is fitted near the middle between an outer container and a vacuum valve 6, and when a vacuum down is detected, the vacuum valve 6 is opened by a signal converted from the vacuum meter 16, and a vacuum pump 5 is operated through it to discharge the atmospheric air leaked into a vacuum space formed by the inner and outer containers. After the vacuum is improved to a predetermined value, the vacuum valve 6 is closed. Thereby, a vacuum adiabatic container can perform an automatic operation that a discharge operation is performed when the vacuum is reduced and it is stopped when the predetermined vacuum is attained during a long time use. Thereafter, this action is repeated, thus the adiabatic container can be used under a stable condition at all times.

Description

[Detailed description of the invention] Regarding the 1χ length of a container with a thermal structure.

This type of container is known as a so-called magic pin.
It consists of an inner container and an outer container, and has a thermal structure by maintaining the space formed by the inner container in a vacuum, and is widely used to keep the contents stored in the inner container cold or warm.

Industrially, this thermal container is indispensable for storing low-temperature liquefied gases such as liquefied gas and liquefied helium.

As an example, the structure of a container for keeping liquefied nitrogen cold is shown in Figure 1. In Figure 1, liquefied nitrogen is kept cold in an insulated container, and the rim gas is cooled inside to remove impurities and gas. When used as a ~lium gas treetop device for
It is a cross-sectional view showing the princess part of this complete outfit.

This will be explained below with reference to FIG. Since the entire curve formed between the outer wall of the inner container l and the inner wall of the outer container 2 is sealed by the lid 3 that is attached to the inner container, the outer container 2 has an external it (I, force), etc. A true pump 5 connected using the trachea 4
After driving the car and exhausting the space mentioned above, the driver was drawn.
A vacuum valve 6 provided in the trachea 4 is provided with an insulating structure that maintains the gap between the trachea I and the outer container 2.On the other hand, the inner container 1 containing nitrogen chloride 7 is provided. Into the inner container 1, sake 1.-IJ 8 is inserted while maintaining an airtight connection with the inner container 1, and the cold shoulder 8 is cooled by adding α to the liquefied nitrogen 7. Because it is made of helium gas. The cooling cylinder 8 is provided with a helium gas inlet 98 and a helium gas outlet 10 to allow helium gas to flow in and out, and to fill the cooling cylinder 8 while the helium gas flows through the cooling cylinder 8. Helium gas is purified by adsorbing and removing impurity gases such as 00, OO2, 01-14, 02, and H2O in helium gas using an impurity gas adsorbent such as activated carbon (not shown). The action is that after a while, the adsorption of impurity residue in helium gas by an adsorbent (not shown) becomes saturated, so at that time, the flow of helium gas into the cooling cylinder 8 is stopped, and the inner container l and After draining the waste chamber cable 7 to the outside by opening the drain box 13 installed in the communication pipe 12 with the static pressure gauge 11 that measures the amount of liquefied carbon 7, the heater 14 installed on the outer periphery of the cooling cylinder 8 is opened. It is also possible to regenerate the swamp absorbing agent by heating the cooling cylinder 8 and releasing the impurity gas adsorbed by the adsorbent (not shown) filled therein.The content of the liquefied element 7 The supply to vessel 1 is provided by another 8 not shown.
This is done through the supply pipe 15 from the container.

When carrying out the helium gas purification process as described above over a long period of time, the transparent structure is used to prevent a decrease in the degree of vacuum in the space consisting of the inner container 1 and outer container 2, which have a heat-insulating structure. It is to be.

However, if you use it for a long time, the contents <a 1 and outer container 2
The gap formed by this process is caused by defects such as the sealing part or joint of the heat container or the container charge).
However, it is often experienced that atmospheric leakage occurs and this causes a decrease in heat resistance, resulting in a deterioration of the insulation performance and the consumption of the heat exchanger cable 7 more than necessary. In addition, especially when using heat cycles of four low and high temperatures to regenerate the adsorbent as described above, it is necessary to If this part is damaged, there is a possibility that it will cause a decrease in the vacuum level.

An object of the present invention is to eliminate the above-mentioned drawbacks and provide a vacuum insulated container that does not deteriorate its heat insulating performance even after long-term use. According to the present invention, the above object is achieved by providing an X-visual meter in the vacuum insulated container, and using this vacuum gauge to connect the inner container and the outer container.
Detecting the -A total temperature drop in the space formed by the vessel, operate the X-Itami and operate the vacuum valve to automatically exhaust the air
This is achieved by enclosing the area and restoring the desired degree of vacuum.

FIG. 2 is a sectional view showing the main parts of the helium gas purification device shown in FIG. 1 when the present invention is applied to a VTR heat vessel. In FIG. 2, the same reference numerals as in FIG. 1 have the same names, but the difference between FIG. 2 and FIG. The Jc nitrogen meter 16 was installed near the middle between the valve 2 and the vacuum valve 6. This vacuum gauge 16 does not support even if it is directly attached to the outer container 2. As the vacuum gauge 16, a Pirani gauge, a Penning gauge, or an ionization A'2 m-F gauge is used.

When the vacuum gauge 16 detects a decrease in A Zen-noh, the signal converted from the A bond gauge 16 opens the vacuum valve 6, which activates the vacuum pump 5 to fill the space formed by the inner and outer containers. The atmosphere is exhausted and the -A temperature is improved. -jc After the nitrogen suction has been improved to the pruning value, the vacuum valve 6 is closed, but when the liquefier 7 is held in the inner container 1 and cooled, it is not used for the vacuum pump 5. Since there is an OT cage property in which the free oil evaporates and is adsorbed on the surface of the inner container 1, the flow between the outer container 2 and the component bonder 5 must be reliably impeded.

Next, the above-mentioned A 2 #I°16 is provided to detect a decrease in the degree of vacuum, and thereby the sequence circuit for exhausting 1 ml of air from all the inner and outer containers is shown in FIG. The pressure switch 17 in FIG. 3 is attached to the vacuum gauge 16, and is turned on when the pressure drops to 2, the relay 18 is activated, and the ridge valve 19 is opened. The tortoise-magnet cooperating cell 19 corresponds to the vacuum valve 6 in FIG. 2, and when it becomes o or n, a Makabe suction force S is started. When the A fertility reaches the value of = r constant, the pressure switch 17 becomes oH, and the relay 18
The @Ltmx valve 19 is closed via the constant current state.

As described above, according to the present invention, when the heat insulating container is used for a period of time, the air is exhausted and the vacuum is passed through to a predetermined degree of vacuum. This can be done automatically, and this process is subsequently repeated, which not only allows the insulated container to be used in a stable state at all times, but also provides airtightness to prevent leaks when manufacturing the insulated container. This eases the need for strict manufacturing and contributes to lower production costs.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the main parts of the helium gas purification equipment.
FIG. 2 is a sectional view showing the main parts of the helium gas purification apparatus according to the present invention, and FIGS. 51 to 3 are circuit diagrams of the automatic exhaust system in FIG. 2. 1: Inner container, 2: Outer container, 4: Exhaust pipe, 5: Meitin bong, 6: Mabo-sho, 7: Liquefied nitrogen, 16: Vacuum gauge, 17: Pressure switch, 18: Relay, 19: Electromagnetic vacuum valve.

Claims (1)

[Claims] 1) A vacuum insulated container consisting of an inner container and an outer container, in which a space formed by the outer surface of the inner container and the inner surface of the outer container is connected to a vacuum pump via an exhaust pipe that communicates with the +rJ section. , comprising a solenoid valve provided in the AiJ exhaust lightning, and a vacuum gauge communicating with the solenoid valve and the space.
Accordingly, the vacuum insulated container is characterized in that the space C is automatically warmed up in response to a decrease in the accuracy of TF+L filJ.