JPH023080B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a method for producing a heat insulating wall body comprising a gas with low thermal conductivity sealed in an outer shell body.

(Prior art) When manufacturing this type of heat insulating wall, a method of sealing a low thermal conductivity gas in the outer shell is, for example, by connecting a communicating pipe to the outer shell and passing a vacuum through the communicating pipe. A possible method is to exhaust air from the inside using a pump, and then fill the outer shell with a gas of low thermal conductivity via a communicating pipe. However, the above-mentioned method has a problem in that when the air inside the outer shell is exhausted, atmospheric pressure acts on the outer shell, leading to its deformation and even destruction. Therefore, in order to deal with this particular problem, the following manufacturing method has conventionally been adopted. That is, first, the outer shell, which has a communication hole that communicates the inside and outside, is housed in a pressure-resistant container, and then a vacuum pump is used to exhaust the air from inside the pressure-resistant container and from the outer shell. A high-temperature gas is allowed to flow in, and a low thermal conductive gas is also allowed to flow into the outer shell through the communication hole, and then the outer shell is removed from the pressure-resistant container.

(Problem to be Solved by the Invention) However, in the above method, since the low thermal conductivity gas must also be introduced into the pressure-resistant container,
Manufacturing costs are high because a large amount of expensive low thermal conductivity gas is required, and there is also the problem that when the outer shell is removed from the pressure container, low thermal conductivity gas flows into the atmosphere and contaminates the working environment. Ta.

Therefore, an object of the present invention is to not only prevent deformation and destruction of the outer shell due to atmospheric pressure acting on the outer shell, but also to reduce the amount of low thermal conductive gas used, and to reduce the amount of gas used in the work. An object of the present invention is to provide a method for manufacturing a heat insulating wall body without any danger of polluting the environment.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides for housing an outer shell in a pressure-resistant container, discharging internal air through a communication pipe connected to the outer shell, and A discharge process for simultaneously discharging the air in the pressure vessel; and a filling process for filling the outer shell with the low thermal conductivity gas through the communication pipe and simultaneously introducing air into the pressure vessel. The present invention is characterized in that the following steps are sequentially performed: and a step of taking out the outer shell from inside the pressure-resistant container.

(Function) In the exhaust process, when the inside of the outer shell is exhausted, the air inside the pressure-resistant container housing the outer shell is also exhausted, so the pressure outside the outer shell is also reduced.
The pressure difference between the inside and outside of the outer shell does not become excessively large.
In addition, during the filling process in which low thermal conductivity gas is filled into the outer shell, air also flows into the pressure container, so even if the pressure inside the outer shell increases due to filling with low thermal conductivity gas, the pressure inside the pressure container The pressure also increases in the same way, and the pressure difference between the inside and outside of the outer shell does not become excessively large. These prevent damage to the outer shell.

Furthermore, when filling the outer shell with a low thermal conductivity gas, it flows through the communication pipe, so the low thermal conductivity gas only flows into the outer shell and does not flow into the pressure vessel. Waste of low thermal conductivity gas and contamination of the working environment can be prevented.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. First, in Fig. 1, which shows how the completed heat insulating wall is used, 1 is the door of the refrigerator, 2 is its outer panel, and 4 is the panel 2 and 3 that are held facing each other at a predetermined distance. outer frame, 5
6 is a heat insulating wall disposed within the outer frame 4 and both plates 2 and 3; 6 is a heat insulating material such as hard urethane foam or glass wool filled in the surplus space inside the door 1; and 7 is a gasket. Now, the above-mentioned heat insulating wall 5 is constructed as shown in FIG. 2 in detail, and 8 in the figure is made of a gas-permeable material such as ethylene-vinyl alcohol copolymer, vinylidene chloride copolymer, polyethylene, or nylon. It is a support frame made of a laminated product such as polyester, and is shaped like a rectangular container with a bottom.The entire periphery of the frame has multiple steps, for example, five steps including the bottom and top. 9
a, 9b, 9c, 9d, and 9e each have a step-like shape that gradually opens, and the support frame 8 is also provided with a communication hole 10, for example, at one location in its upper part. Each of 11a, 11b, 11c, 11d, and 11e is a heat reflective film made of a metal-deposited film, particularly a film with metal vapor-deposited on both the front and back sides, or a metal foil such as aluminum foil, which has a low emissivity. A plurality of space layers 12, for example four, are attached to each of the step portions 9a to 9e of the support frame 8 to form a plurality of space layers 12, for example, four space layers within the support frame 8.
a, 12b, 12c, and 12d, which constitute an outer shell 13 having space layers 12a to 12b inside. In addition, each heat reflective film 1
As for 1a to 11e, except for the lowermost and uppermost heat reflective films 11a and 11e, the remaining intermediate heat reflective films 11b, 11c, and 11d have a large number of holes 11f as shown in FIG. This allows each of the spatial layers 12a to 12d to communicate with each other.

The filling device for filling the above-mentioned outer shell 13 with the low thermal conductivity gas is constructed as shown in FIG. 4. That is, in this Figure 4, 14
is, for example, a cylindrical pressure-resistant container, which is constructed so that the outer shell 13 can be removably housed therein and sealed, and an exhaust pipe 15 is connected thereto. Reference numeral 16 denotes a first communication pipe, one end of which is inserted into the pressure vessel 14, and a coupling 17 is provided at the end. 18 is a second communication pipe, one end of which is removably and airtightly fitted into the communication hole 10 of the outer shell 13, and the other end is fitted with the coupling 17.
By connecting both the coupling rings 17 and 19 to each other, the inside of the outer shell 13 can be communicated with the first communication pipe 16 via the second communication pipe 18. I'm doing it like that. The exhaust pipe 15 and the second communication pipe 18 are arranged together with the first to fourth valves 20 to 23 as shown in the figure. Further, 24 is a vacuum pump, 25 is a cylinder filled with a low thermal conductivity gas such as chlorofluorocarbon, krypton, xenon, argon, sulfur hexafluoride, or carbon dioxide, singly or in combination, 26 and 27 are both pressure gauges, and 28 is an atmosphere communication portion provided on the side opposite to the exhaust pipe 15 of the first valve 20.

In order to fill the outer shell 13 with a gas having low thermal conductivity, the following procedure is performed. That is, first, as shown in FIG. 4, with the outer shell 13 housed in the pressure-resistant container 14 and the coupling rings 17 and 19 connected to each other,
The first and fourth valves 20 and 23 are closed, the second and third valves 21 and 22 are opened, and the vacuum pump 2
Activate 4. As a result, the air inside the pressure vessel 14 is discharged via the exhaust pipe 15, and at the same time, the air inside the outer shell 13 is also discharged through the first and second communication pipes 1.
6 and 18 (exhaust stroke). At this time, the pressure inside and outside the outer shell 13 decreases at the same time, so there is no pressure difference between the inside and outside, and therefore the outer shell 1
3 can be reliably prevented from being deformed. After exhausting the air in the outer shell 13 and the pressure container 14, the second and third valves 21 and 22 are closed to stop the vacuum pump 24, and the first and fourth valves 20 and 24 are opened. . As a result, air flows into the pressure vessel 14 from the atmosphere communication section 28 via the first valve 20 and the communication pipe 15, and at the same time, air flows from the cylinder 25 into the fourth valve 23 and the first and second valves. A low thermal conductivity gas flows into the outer shell 13 through the communication pipes 16 and 18 to fill it (filling process).
At this time, the pressures inside and outside of the outer shell 13 rise almost simultaneously, so no pressure difference occurs between the inside and the outside, and deformation of the outer shell 13 can be reliably prevented. In addition, since the low thermal conductivity gas is filled into the outer shell 13 through the first and second communication pipes 16 and 18 and does not flow into the pressure-resistant container 14, the amount required can be reduced to the minimum required amount. . Thereafter, the pressure container 14 is opened, the coupling rings 17 and 19 are removed, and the outer shell 13 is taken out (removal step). At this time, since no low thermal conductivity gas is flowing into the pressure vessel 14 as described above, there is of course no risk of contaminating the working environment due to the opening of the pressure vessel 14. After removing the outer shell 13 from the pressure container 14,
The second communication pipe 18 is removed from the communication hole 10, the communication hole 10 is closed, and a low thermal conductivity gas is sealed inside to form the heat insulating wall body 5, and then the heat insulating wall body 5 is It is disposed within the outer panel 2, inner panel 3, and outer frame 4, thereby completing the refrigerator door 1.

Incidentally, FIG. 5 shows a different embodiment of the present invention, and the difference from the above embodiment is that the exhaust pipe 15
A differential pressure gauge 29 is provided between the first valve 20 and the second communicating pipe 18, and the opening degree of the first valve 20 can be adjusted based on the detected value of the differential pressure gauge 29.
A switching valve 30 is provided between both valves 22 and 23 of the second valve.
The communication pipe 18 is configured to be able to selectively communicate with either the third valve 22 or the fourth valve 23. With this configuration, the amount of air flowing into the pressure container 14 during the filling process can be adjusted, so that it can be made the same as that in the outer shell 13, and it is possible to more reliably prevent a pressure difference between the inside and outside.
In turn, this becomes even more effective in preventing deformation of the outer shell 13. In addition, even in the exhaust stroke, by switching the switching valve 30 so that the second communication pipe 18 and the third valve 22 communicate with each other, even if a leak occurs in the fourth valve 23, the heat conduction is reduced. It is possible to reliably prevent the work environment from being contaminated due to the inflow of gas into the vacuum pump 24 side.

〔Effect of the invention〕

As described above, the present invention stores the outer shell in a pressure-resistant container and exhausts air from the outer shell and the pressure-resistant container,
It is characterized by the fact that the outer shell is then filled with a gas with low thermal conductivity, and at the same time air is allowed to flow into the pressure container, resulting in a pressure difference between the inside and outside of the outer shell during the exhaust and filling strokes. Not only can this prevent the occurrence of gas that leads to deformation of the outer shell, but since the low thermal conductivity gas only needs to flow into the outer shell, the amount used can be reduced and there is no waste. This provides an excellent effect in that there is no risk of contaminating the working environment with low thermal conductivity gas.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention,
Fig. 1 is a partial longitudinal sectional view of the refrigerator door, Fig. 2 is a sectional view of the entire heat insulating wall, Fig. 3 is a plan view of the heat reflective film, Fig. 4 is a schematic diagram of the filling device, and Fig. 4 is a schematic diagram of the filling device. 5
This figure is a diagram corresponding to FIG. 4 showing another embodiment of the present invention. In the figure, 1 is a refrigerator door, 5 is a heat insulating wall, 10 is a communication hole, 13 is an outer shell, 14 is a pressure container, 15 is an exhaust pipe, 16 and 18 are first and second communication pipes,
24 is a vacuum pump, and 25 is a cylinder.

Claims (1)

[Claims] 1 A heat insulating wall body is manufactured by sealing a low thermal conductivity gas in an outer shell body, the outer shell body is housed in a pressure-resistant container, and the interior is and at the same time exhausting the air inside the pressure vessel, and then filling the outer shell with the low thermal conductivity gas through the communication pipe, and at the same time discharging the air inside the pressure vessel. A method for producing a heat insulating wall body, comprising a filling process in which air is introduced into the container, and a removal process in which the outer shell is taken out from inside the pressure-resistant container.