JPS586386A - Manufacture of heat insulating box body for refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for manufacturing a refrigerator insulating box, in which a foamable liquid synthetic resin is injected into a space consisting of an inner box and an outer frame, and the space is insulated by foaming. In the method of manufacturing a refrigerator insulation box configured to be filled with material, the insulation material is formed by foaming the above-mentioned foamable liquid synthetic resin in advance in areas where it is impossible to contact the mold material. The present invention relates to a method of manufacturing a heat-insulating refrigerator box in which foaming pressure is not applied to the impossible portions by filling the box with foam.

Generally, in a cold carpet warehouse, a heat insulating box is constructed by filling a heat insulating material between an inner box that houses refrigerated items and an outer frame that surrounds the outside of the inner box with a predetermined gap. There is. and,
One method of filling the space between the inner box and the outer frame with a heat insulating material is to form a space between the inner box and the outer frame, and inject a foamable liquid synthetic resin into the space to foam it. Accordingly, there is a method of filling the space with a foamed heat insulating material to obtain heat insulating properties. In this case, the pressure during foaming is applied to the inner wall surfaces of the inner box and outer frame, but since the inner box and outer frame are usually made of thin plastic or metal plates or frames, the foaming pressure is It cannot withstand the heat and swells and deforms. Therefore, it is necessary to press the outer periphery of the inner box and outer frame with a shape material. However, due to the arrangement of refrigerant piping, equipment such as a refrigeration compressor and condenser must be attached to predetermined positions on the outer frame before forming the foamed heat insulating material. Therefore, when the above-mentioned single piece of material is brought into contact with the outer frame, it is not possible to bring the mold material into direct contact with the part of the outer frame where the above-mentioned equipment is attached. There was a drawback that only that part would swell due to the foaming pressure.

The purpose of the present invention is to solve all of the above drawbacks, and by foaming a foamable liquid synthetic resin injected into the space consisting of the inner part and the outer frame, the above space is made into a foamed heat insulating material. In the method for manufacturing a refrigerator insulation box configured to be filled with material, the portions where the mold material cannot come into contact are filled in advance with a foamed insulation material formed by foaming the foamable liquid synthetic resin. Accordingly, the foam insulation material can be filled between the inner box and the outer frame without any problem even if there are parts of the inner box or outer frame that are not in direct contact with the mold material. The purpose is to provide a manufacturing method for. This will be explained below with reference to the drawings.

The figure is a sectional view of a thermal insulation box for explaining an embodiment of the method for manufacturing a refrigerator insulation box according to the present invention. In the figure, numeral 1 is an inner box that also serves as an evaporator, 2 is an outer frame, and 3
Reference numerals 4 and 5 refer to the refrigeration equipment section, and 4 and 5 are foamed heat insulating materials, in which the foamed heat insulating material 4 is formed by foaming a foamable liquid synthetic resin in advance, and the foamed heat insulating material 5 is inserted therein.
The foamable liquid synthetic resin is injected into the space formed by the inner box 1 and the outer frame 2 and foamed.

The illustrated embodiment of the present invention is basically as described at the beginning of this specification, in which the foamable liquid synthetic resin is completely injected into the space surrounded by the inner box and the outer frame 2. By doing so, the foamed heat insulating material 5 is filled between the inner box 1 and the outer frame 2. As mentioned above, during the foaming process, the foaming pressure is applied to the inner wall surfaces of the inner box 1 and the outer frame 2, so the outer surfaces of the inner box 1 and the outer frame 2 must be held down with a mold material (not shown). /)
. However, as in the illustrated embodiment, a refrigerant pipe (not shown) may be connected between the inner box 1 and the refrigeration device section 3 such as a compressor or a condenser. Therefore, the refrigeration device section 3 must be attached to the outer frame 2 when the inner box 1 and outer frame 2, which constitute the heat-insulating outer shell, are assembled. Therefore, it is impossible to hold down the part where the refrigeration device part 3 is attached with the mold material, and if the foamable liquid synthetic resin is foamed in that state, the part will swell and cave in, which is an undesirable problem. A situation occurs.

In the present invention, as mentioned above, the part that cannot be held down by the mold material, that is, the attachment part of the refrigeration equipment part 3 in the illustrated embodiment, is made by preliminarily forming a foaming liquid compound between the part and the blower 1, which is opposite to the part. Foamed insulation material 4 formed by foaming resin
Insert it. Then, by injecting the foamable liquid synthetic resin into the space excluding the foamed heat insulating material 4 and causing it to foam, the space will be filled with the foamed heat insulating material 5. In this case, it goes without saying that the parts other than the part to which the refrigeration equipment part 3 is attached are held down by molded materials (not shown); Since the foamed heat insulating material 4 is filled, no pressure is applied during foaming, making it possible to manufacture a heat insulating box of a desired shape as in the illustrated embodiment.

In addition, since the injected foamable liquid synthetic resin adheres closely to the foam insulation material 4 filled in advance, the foam insulation material 4
Not only is the foam insulation material 5 formed later integrated with the foam insulation material 5, but also the foam insulation material 4 and the small gap between the pre-filled foam insulation material 4, the inner box, and the outer frame 2 are filled with the foam insulation material 5. Since the resin penetrates, the space surrounded by the inner box 1 and outer frame 2 is completely filled with the foamed heat insulating materials 4 and 5, so that a heat insulating box with good heat insulation performance is desired. Note that since the amount of the foamable liquid synthetic resin that enters into the gaps between the foamed heat insulating material 4 and the inner box 1 and outer frame 2 is small, the foaming pressure of the infiltrated liquid synthetic resin causes the outer frame 2 to is not deformed.

As explained above, according to the present invention, when manufacturing a heat insulating box by foaming a foamable liquid synthetic resin between the inner box and the outer frame of a refrigerator, the parts of the mold material that cannot be contacted are removed. By just taking a simple step of filling the inside with a pre-formed foam insulation material, the inner box and outer frame can be made without deforming.
It is possible to provide a method for manufacturing a refrigerator heat-insulating box body in which the space between the inner box and the outer frame body can be completely filled with an integral foam heat-insulating material.

Although a box-shaped frame is shown as the frame, the present invention is not limited to this, and may be a so-called outer frame only.

[Brief explanation of drawings]

The figure shows a sectional view of a heat insulating box for explaining an embodiment of the method for manufacturing a heat insulating refrigerator box according to the present invention. In the figure, 1 is an inner box, 2 is an outer frame, 3 is a refrigeration device, and 4 and 5 are foamed heat insulating materials. Patent applicant: Sawafuji Electric Co., Ltd.

Claims (1)

[Claims] A mold material is brought into contact with the outer peripheral surfaces of an inner box that is to house refrigerated items and an outer frame that surrounds the inner box with a predetermined gap, and foam is formed in the space formed by the inner box and the outer frame. In the method for manufacturing a refrigerator insulation box body, the space is filled with a heat insulating material formed by injecting a foamable liquid synthetic resin and foaming the foamable liquid synthetic resin, and the inner box of the part of the mold material that cannot be touched. A heat insulating material formed by foaming the above-mentioned foamable liquid synthetic resin is filled in advance in the gap between the space and the outer frame, and the above-mentioned space is filled by injecting and foaming the above-mentioned foamable liquid synthetic resin into the other space. A method for manufacturing a refrigerator insulation box, characterized in that the insulation material is filled with a heat insulation material integrated with the foamed insulation material.