JPS5856074B2 - cold storage container - Google Patents

Description

[Detailed description of the invention] The present invention relates to cold storage containers.

In order to store blood, livestock semen, microorganisms, biological agents, or metallurgical samples in a frozen state, it is possible to fill a tank with a low boiling point gas such as liquid nitrogen and take advantage of the low temperature. It is being said.

Conventionally, in this type of container, the temperature distribution inside the container is generally maintained at a nearly constant temperature in the lower part of the storage space, but the temperature in the upper part of the storage space is changed by opening and closing the insulating lid, or by changing the temperature through the insulating lid or vacuum insulation layer. It is difficult to maintain a uniform temperature throughout the storage space due to fluctuations due to heat conduction, a decrease in the amount of low-boiling liquefied gas, etc.

In particular, temperature fluctuations near the insulating lid located at the top of the storage space are large.

An object of the present invention is to provide a low temperature storage container that can maintain a uniform cooling temperature within the storage space.

The present invention will be described below with reference to the drawings showing a longitudinal cross-sectional view of a preferred embodiment thereof.

The inner tank 1 has a substantially double U-shaped cross-section, forming a storage tank 2 for storing stored materials therein;
And in the middle of the double wall, there is a cross section U filled with low boiling point liquefied gas 3.
A letter-shaped chamber 4 is formed.

A supply pipe 5 for supplying low boiling point liquefied gas 3 from the outside into the chamber 4 is attached to a part of the upper end of the inner tank 1, and a valve 6 of this supply pipe supplies the low boiling point liquefied gas into the chamber 4. It is closed except when necessary.

An outer tank 8 is arranged around the inner tank 1 to form a vacuum heat insulating space 7, and the upper opening of the storage tank 2 is closed with a heat insulating lid 9.

A pipe 10 extends from the chamber 4 through the wall of the storage tank 2 to the inside of the storage tank 2, and its lower end is open to communicate with the low boiling point liquefied gas in the chamber 4, while the upper end of the pipe 10 is It is sealed, and a plurality of small holes 11 are formed in the side near it.

The tube 10 is fixed to the wall of the storage tank 2.

Stored substances (not shown) such as blood, livestock semen, and microorganisms are stored in the storage tank 2 .

The inside of the storage tank 2 is cooled by the low boiling point liquefied gas 3 through the wall of the storage tank 2 .

The wall of the storage tank 2 , in particular the part 13 located between the storage tank 2 and the upper gas phase part 12 in the chamber 4 , is located between the gas in the storage tank 2 and the low-boiling liquefied gas in the chamber 4 . heat exchange is performed.

If the temperature inside the storage tank 2 rises, especially the temperature in the upper part thereof, the pressure in the gas phase 12 will increase, and this pressure increase will push down the upper surface of the low boiling point liquefied gas 3, so that the low boiling point liquefied gas The gas is forcibly pushed through the pipe 10, ejects from the small hole 11 of the pipe 10 toward the inside of the storage tank 2, and vaporizes, causing the internal temperature to rise, especially in the upper part of the storage tank 2 where the temperature rise is large. The temperature inside the storage tank 2 is kept uniform and stable by lowering the temperature of the storage tank 2.

In particular, when the heat insulating lid 9 is removed, air enters the storage tank 2 and raises the internal temperature of the storage tank, but this configuration shows an excellent response to such cases.

In connection with this responsiveness, in order to ensure that the pressure increase in the gas phase section 12 causes the low boiling point liquefied gas to be ejected from the small hole 11 of the tube 10, the open lower end of the tube 10 is connected to the bottom of the storage tank 2. It terminates below the wall.

The embodiments of the present invention shown in the drawings have been described above.
The shapes shown in the drawings are merely exemplary, and the inner tank 1 has a double-walled structure that forms a chamber for storing low-boiling point liquefied gas, and has a shape that forms a storage tank.
It can be of any shape, such as cup-shaped or asymmetrical.
The outer tank 8 can also be of an asymmetrical shape, and the tube 10 does not need to be installed at the center of the bottom wall of the storage tank, and a tube other than a straight tube erected vertically can also be used.

As can be understood from the above description, the low temperature storage container according to the present invention can maintain a uniform temperature distribution within the storage tank at a constant temperature approximately equal to the temperature of the low boiling point liquefied gas, and the inner tank has two Since the tank has a heavy-walled structure and is independent, the stored items in the storage tank are not directly contacted by the low-boiling liquefied gas, allowing for cooling of stored items that do not want to be immersed in the low-boiling liquefied gas. Particularly suitable for use in

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of a preferred embodiment of the invention. 1... Inner tank, 2... Storage tank, 3... Low boiling point liquefied gas, 4... Chamber, 7... Vacuum insulation space, 8... Outer tank, 9... Insulating lid , 10...tube, 11...small hole.

Claims (1)

[Claims] 1 It has a substantially double U-shaped cross section so as to form a storage tank surrounded by a double wall structure, and in the middle of the double wall is a chamber with a U-shaped cross section filled with a low boiling point liquefied gas. an outer tank arranged around the inner tank to form a vacuum insulated space surrounding the inner tank, and a pipe extending from the chamber to the inside of the storage tank, the lower end of which is connected to the storage tank. a pipe that opens at a position below the bottom wall so as to communicate with the low boiling point liquefied gas in the room, is sealed at the upper end, and has a plurality of small holes formed on the side near the pipe; and a storage tank. A low-temperature storage container characterized by comprising: an insulating lid that closes a top opening of the container.