JPS608598A - Method of filling heat insulating wall of heat insulating tank with powder - Google Patents

Abstract

PURPOSE:To obtain a method of filling at a high speed and in high density, by filling with a powdery material while a heat insulating tank is vibrated, in the case of the method filling a space between double walls of the heat insulating tank with the powdery material. CONSTITUTION:A heat insulating tank unit 1 of double wall construction is fixed to a vibrating bed 2, air-tightly connecting a delivery opening part 7A of a hopper 7 storing a powdery material 6 and air-tightly connecting a vacuum attractive device 8 to the other opening part 4B. Then a space 3 between double walls is filled with the material from the delivery opening part 7A of the hopper 7 while oscillation is applied by the vibrating bed 2. In this way, the inside of the space is filled with the powdery material 6 with fineness further with uniformity, and a filling speed is also improved by further applying also a back pressure of vacuum suction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for filling powder into an insulated wall of an insulated tank.

Conventionally, insulated tanks for keeping heat and cold have been used by filling the space between the double walls of the tank body with a double wall structure, and filling the space between the double walls with inorganic porous powder such as diatomaceous earth or perlite. It is known that the space is sealed and evacuated.

In this type of insulated tank, the radiation heat transfer in vacuum is suppressed by the powder filled in the space between the double walls, and the insulation is achieved very well. In addition, if the filling density is uneven, heat radiation will be concentrated in areas with low density, so there is a drawback that the heat retention of the tank as a whole will be significantly reduced.

For example, in conventional cold storage tanks for liquefied gas, pearlite powder is generally used as the powder, and its packing density is 0.1 liters/cyn5 to o, 2 liters/cm'. However, according to experiments conducted by the present inventors, the above packing density is still not sufficient, and is 0.65 to 0.9097c.
When the temperature is increased to m', radiant heat transfer almost disappears,
It was found that the insulation effect was dramatically improved.

However, in the past, there was no method suitable for industrial mass production to fill the space between the double walls of the double wall tank with powder at the high density described above, even if it was a laboratory method. Even if it is clear that increasing the packing density is sufficient, there is a problem in that it is difficult to achieve this goal.

This invention has been made in view of the problem described in item 1, with the purpose of providing a method for rapidly and highly densely filling powder into the insulating walls of an insulating tank, and is a double-walled The structured insulated tank body is placed and fixed on a vibration table, and the discharge opening of the hopper, which stores the powder material which has been subjected to baking treatment in advance, is made airtight in the space opening between the double walls of the insulated tank body. and airtightly connect a vacuum suction device to the other opening of the space between the double walls, and drive the vacuum suction device while applying vibration to the heat insulating tank body by the vibration table, This method is characterized in that the space between the double walls is filled with powder material from the discharge opening of the hopper.

This invention will be explained below with reference to Examples.

FIG.

In the method of filling powder into the heat insulating wall of a heat insulating tank according to the present invention, a heat insulating tank body 1 having a double wall structure is placed and fixed on a vibration table 2, and the powder is filled between the double walls IA and IB of the heat insulating tank body 1. The discharge opening 7A of the hopper 7, which has been previously subjected to baking treatment (section 5 in the figure) and stores the LC powder material 6, is airtightly connected to the opening 4A of the space 3, and the space between the double walls is connected airtightly. A vacuum suction device 8 is airtightly connected to the other opening 4B, and while applying vibration to the heat insulating tank body l using the vibration table 2 and driving the vacuum suction device 8, the discharge opening 7A of the hopper is It is constructed by filling the space 3 between the double walls.

In addition, 8A in the figure indicates that the powder material 6 is sucked into the vacuum suction device 8 by σ1.
This is a filter to prevent

The powder material 6 used in the above embodiments is made of fine powder particles of diatomaceous earth, perlite, etc., which are generally used as powder materials for this type of powder vacuum insulation tank.

Since the present invention is constructed as described above, even if the space between the double walls of a tank body with a double wall structure is narrow and deep, the inside can be filled using a vacuum suction device and a vibration device. It became possible to pack the powder extremely densely and uniformly, and it became possible to achieve a packing density of about 0.6 to 0.9 cm/cm.

In addition, when supplying powder material, the baking process is performed continuously in the transfer pipe beforehand to the hopper, and the dry powder material is continuously supplied, and the back pressure of vacuum suction is applied during powder filling. It has various effects such as a very fast filling speed and a marked improvement in processing speed.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the state of implementation of the present invention. DESCRIPTION OF SYMBOLS 1... Heat insulation tank body, 2... Vibration table, 3... Space, 4, A, 4B... Opening, 5... Burner for baking process, 6... Powder material, 7...・Hopper, 7A・
...Discharge opening, 8...Vacuum suction device.

Claims (1)

[Claims] (1) An insulated tank body with a double-walled structure is placed and fixed on a shaking table, and a hopper is placed in which a powder material that has been subjected to a baking process is stored in the space opening between the double walls of the insulated tank body. The discharge openings are airtightly connected, and a vacuum suction device is airtightly connected to the other opening in the space between the double walls, and the vibration table vibrates the insulating tank body while simultaneously applying the vacuum suction. A method for filling powder into a heat insulating wall of a heat insulating tank, characterized in that the space between the double walls is filled with powder material from the discharge opening of the hopper while driving the device.