JPH05142075A - Pressure inspection method for vacuum heat insulation panel - Google Patents

Abstract

PURPOSE:To accurately inspect internal pressure in a vacuum heat insulation panel by inspecting the pressure inside the vacuum heat insulation panel based on whether or not the film of vacuum heat insulation panel has expanded at the part opposed to the recessed part of packing body. CONSTITUTION:When a vacuum heat insulation panel 1 is left in the air, a film 5 and inner bag 3 show a recessed shape along a recessed part 7 because the pressure is high outside a housing body 6 and low inside the body 6. When the pressure inside the panel 1 is subject to inspection, the panel 1 is housed in a vacuum container and the vacuum container is gradually evacuated. Then, the pressures inside and outside the housing body 6 of the panel 1 are balanced, so that the film 5 on the part opposed to the recessed part 7 will restore to flatened state. Thus, after it is detected that the pressure difference between inside and outside the body 6 has been eliminated and equalized, the pressure within the vacuum container is measured so that the pressure within the body 6 can be measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting the pressure of a vacuum heat insulation panel, in which the pressure inside the vacuum heat insulation panel is inspected by accommodating the vacuum heat insulation panel in a vacuum container.

[0002]

2. Description of the Related Art Conventionally, a vacuum heat insulation panel has a bag-shaped container made of a non-breathable film in which a filler made of powder or fibrous material is housed and the inside of the container is vacuumed. It is constructed by drawing and then sealing. When the pressure inside the vacuum heat insulation panel, that is, the inside of the housing, is high, the thermal conductivity increases and the heat insulation performance deteriorates. For this reason, it is essential to inspect the pressure inside the manufactured vacuum insulation panel. In order to perform this inspection, when the vacuum insulation panel is placed in a vacuum container and the pressure around the vacuum insulation panel is lowered, and the pressure inside the vacuum insulation panel container balances with the ambient pressure and the container expands. The pressure inside the vacuum container was measured with a pressure gauge, and the pressure inside the container was known from the measured pressure value.

[0003]

However, in the above-mentioned conventional structure, when the pressure inside the vacuum container and the pressure inside the housing are balanced, the expansion of the housing occurs over the entire surface of the non-air-permeable film, and therefore the displacement thereof occurs. Is extremely small, and it is very difficult to detect this displacement with high precision by visual observation or mechanical means. For this reason, there is a drawback that the pressure inside the housing is inaccurately measured and the pressure inside the vacuum heat insulating panel cannot be accurately inspected.

Therefore, an object of the present invention is to provide a method for inspecting the pressure of a vacuum insulation panel, which can easily detect the expansion of the housing of the vacuum insulation panel and can accurately inspect the pressure inside the vacuum insulation panel. There is.

[0005]

A method for inspecting a pressure of a vacuum heat insulating panel according to the present invention is a vacuum heat insulating panel in which a filling body is housed in a housing made of a non-permeable film, evacuated, and then sealed. In a pressure inspection method for inspecting the internal pressure of the vacuum heat insulation panel by housing the vacuum heat insulation panel in the vacuum container, a recess is formed in the surface portion of the filling body in advance, and the vacuum heat insulation is performed in the vacuum container. After accommodating the panel, the internal pressure of the vacuum insulation panel is reduced based on whether the film of the vacuum insulation panel expands in the portion facing the recess of the filling body while lowering the pressure in the vacuum container. It is characterized by the fact that it is inspected.

[0006]

According to the above means, since the concave portion is formed in the surface portion of the filling body of the vacuum heat insulation panel in advance, the pressure in the vacuum container is reduced and the pressure inside and outside the housing of the vacuum heat insulation panel is controlled. When matched, the film of the vacuum heat insulating panel is greatly expanded at the portion facing the recess, and the expansion can be easily detected. Therefore, the pressure inside the vacuum insulation panel can be accurately inspected based on whether or not the film has expanded in the portion of the filling body facing the recess.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 1 is a vacuum insulation panel,
For example, a powdery heat insulating material 2 such as pearlite is housed in an inner bag 3 made of kraft paper or the like to form a filling body 4, and the filling body 4 is made of a non-air-permeable material such as polyester. Stored in a bag-shaped storage body 6 made of film 5,
A vacuum is drawn after the housing, and the inlet is hermetically closed by means such as welding.

Reference numeral 7 denotes a spherical concave portion formed in the heat insulating material 2 at a position facing the surface of the filling body 4, that is, a portion facing the inner surface of the inner bag 3. It is opposed to the film 5 which constitutes 6.

When the vacuum heat insulating panel 1 is placed in the atmosphere, the pressure on the outside of the container 6 is high and the pressure on the inside is low, so that the film 5 and the inner bag 3 are along the recess 7. It has a depressed shape.

Next, when inspecting the pressure inside the vacuum heat insulating panel 1, that is, when measuring the pressure inside the housing 6, the vacuum heat insulating panel 1 is housed in a vacuum container (not shown). Then, the pressure in the vacuum container is gradually reduced. When the pressure inside and outside the housing 6 of the vacuum heat insulation panel 1 is balanced, the film 5 in the portion facing the recess 7 expands and restores to a flat state as shown in FIG. The pressure inside the container 6 is measured by detecting that the pressure difference between the inside and the outside of the container 6 has disappeared and is equalized, and measuring the pressure inside the vacuum container at this time.

By the way, when the vacuum heat insulating panel 1 is placed in the atmosphere and the pressure inside the housing 6 is low, the portion facing the concave portion 7 receives the atmospheric pressure and falls along the concave portion 7 ( (See FIG. 1), when the pressure difference between the inside and the outside of the housing body 6 disappears, the film 5 in the portion facing the recess 7 immediately expands and becomes flat due to its own restoring force, and the entire surface of the housing body 6 swells as compared to the conventional configuration. The displacement of the portion facing the concave portion 7 is large, and this displacement can be easily detected visually or by a mechanical means. Therefore, the pressure inside the storage body 6 can be measured very accurately.

FIG. 4 shows a second embodiment of the present invention, in which a portion different from the first embodiment is replaced by a recess 8 instead of the recess 7.
The support plate 9 having the above is arranged so as to contact the inner surface of the inner bag 3.

FIG. 5 shows a third embodiment of the present invention. The part different from the first embodiment is that a support plate 11 having a recess 10 instead of the recess 7 is provided on the outer surface of the inner bag 3. It is arranged so as to be in contact with each other. Even in the second and third embodiments described above, when the housing 6 is placed in the atmosphere, the film 5 has a shape that is depressed along the concave portion 8 or 10. When it is deformed and the pressure difference between the inside and the outside of the housing body 6 disappears, the film 5 in the portion facing the concave portion 8 or 10 immediately expands and becomes flat, so that the same effect as the first embodiment can be obtained. Play.

[0014]

As is apparent from the above description, the present invention is such that a recess is formed in the surface portion of the filling body in advance, and
After accommodating the vacuum insulation panel in the vacuum container, the internal pressure of the vacuum insulation panel is reduced based on whether or not the film of the vacuum insulation panel expands at the portion facing the recess of the filling body while lowering the pressure in the vacuum container. Since it is configured to inspect the pressure, the expansion of the film of the vacuum insulation panel can be easily detected, the pressure inside the housing of the vacuum insulation panel can be accurately measured, and the pressure inside the vacuum insulation panel can be accurately inspected. It has an excellent effect that it can be done.

[Brief description of drawings]

FIG. 1 is an enlarged vertical cross-sectional view of a main part of a vacuum heat insulation panel showing a first embodiment of the present invention.

[Figure 2] Vertical cross-sectional view of the entire vacuum insulation panel

FIG. 3 is an enlarged vertical cross-sectional view of a main part of a vacuum heat insulation panel showing an operation state different from that in FIG.

FIG. 4 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 1 showing a third embodiment of the present invention.

[Explanation of symbols]

1 is a vacuum heat insulation panel, 4 is a filler, 5 is a film, 6 is a container, 7 is a recess, 8 is a recess, 9 is a support plate, 10 is a recess, and 11 is a support plate.

Claims (1)

[Claims] 1. An inside of the vacuum heat insulating panel, wherein a vacuum heat insulating panel, which is formed by housing a filling body in a housing made of a non-breathable film, evacuating and then sealing, is housed in a vacuum container. In the pressure inspection method for inspecting the pressure of, while preliminarily forming a recess in the surface portion of the filling body, after accommodating the vacuum insulation panel in the vacuum container, while lowering the pressure in the vacuum container, The pressure of the vacuum heat insulating panel is characterized in that the pressure inside the vacuum heat insulating panel is inspected based on whether or not the film of the vacuum heat insulating panel expands at a portion facing the concave portion of the filling body. Inspection method.