JPS6138389B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a heat insulating box body in which a foamed heat insulating material such as urethane foam is filled from a back injection port in a space formed by an outer box and an inner box.

To use foam insulation for this type of refrigerator, place the opening of the refrigerator at the bottom and the back of the refrigerator at the top, and inject the undiluted solution through the injection port provided on the back, and then fill the foam from the opening side of the refrigerator to the back. For this purpose, the above heat insulating agent was foam-molded.

Such foam insulation materials generate considerable pressure during the molding process. The present invention relates to a lid that is attached to the inlet portion against this pressure.

The details of the present invention will be explained below with reference to an embodiment shown in the drawings. Reference numeral 1 denotes a refrigerator body, and the refrigerator body 1 is composed of an outer box 2, an inner box 3, a heat insulating material 4, a partition wall 5, doors 6, 7, etc. has been done. 8 is a cooler; 9 is a cooler that transfers the cold air cooled by the cooler 8 to a freezer compartment 10 and a refrigerator compartment 11;
12 is the previous blower 9.
This is the drive motor that drives the. When installing this drive motor, as shown in the figure, by making a recess 14 on the outer box 2 side using a backing plate 13 and installing it in this part, the shaft 12a of the drive motor 12 can be shortened. Since it is possible to do this, it is possible to minimize core runout, etc.

15 is a condenser, and 16b is a lid that covers the urethane foam stock solution injection port 16a. A gas vent hole 17 is provided in the inner box near the injection port 16a (inside the back wall). 18 is a heat insulating piece such as glass wool that prevents the foamed heat insulating agent from flowing out to the inner box side from the gas vent hole 17 and allows only the gas generated during foaming to escape to the outside; 19 is the shaft 12a of the drive motor 12; This is an opening provided in the inner box 3 to penetrate into the inside of the refrigerator. 20 is a gas permeable heat insulating material that can prevent the foamed heat insulating material from flowing out to the inner box side through the opening 19 and allow only the gas generated during foaming to escape to the outside. In this case, the opening 19 provided to penetrate inside also serves as a gas vent hole. Therefore, in addition to the gas vent hole provided in the inner box, the opening through which the shaft of the drive motor passes through the inside of the refrigerator can also be used as a gas vent hole.
Gas can be removed sufficiently. Therefore, the foaming fluidity of the foamed heat insulating agent is improved, and the foaming time can be shortened. In addition, gas permeable heat insulating material 2
0 is sandwiched between the inner box and the recess created for installing the drive motor. Next, the positional relationship of the gas vent hole 17, the opening 19, and the injection port 16a and the molding of the foamed heat insulating material 4 will be explained with reference to FIG. Make sure that the back side of the refrigerator is located upwards, and
1. After attaching the outboard 22, fill the stock solution of foam insulation material through the injection port 16a. The filled stock solution is A
reaches the point where foaming begins as shown by the arrow. The gas generated at this time is discharged to the company side from a gas vent hole 17 and an opening 19 provided at a position sandwiching the injection port 16a and near the end of foaming of the foamed heat insulating agent. Therefore, gas is not mixed into the heat insulating material as in the past.

At this time, the lid 16b covering the injection port 16a is pressed with a guide bar 23 installed outside as shown in the figure to cause foaming.

That is, after foaming is completed, the lid is held by the adhesive force of the urethane foam itself, and is pressed by the guide bar 23 during this process.

As explained above, the present invention provides a refrigerator in which a foamed heat insulating agent is filled from the back injection port of a space formed by an outer box and an inner box, and the foam is foamed while pressing a lid that blocks the injection port. After the foaming is completed, the lid is held by the adhesive force of the urethane foam itself, so there is no need to close the injection port with a separate cover after the foaming is completed, as is the case with conventional foaming, and the manufacturing dimensions of the Kaidobar can be adjusted accordingly. Even if the lid cannot be fitted (closely attached) to the injection port due to an error or the like, the lid can still be attached to the injection port. Further, since the heat insulating material provided in the opening is sandwiched between the recess and the inner box, gas can be released without the foamed heat insulating material leaking from the opening.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a refrigerator equipped with the present invention, and FIG. 2 is a diagram showing the state of insulation molding of the refrigerator box of FIG. 1. 1...refrigerator body, 2...outer box, 3...inner box,
4...Insulating agent, 5...Partition wall, 6...Door, 7...
... Door, 8 ... Cooler, 9 ... Blower, 10 ... Freezer room, 11 ... Refrigerator room, 12 ... Drive motor, 1
3...Plate, 14...Recess, 15...Condenser, 1
6a...Inlet, 16b...Lid, 17...Gas vent hole, 18...Insulating piece, 19...Opening, 20...Gas permeable insulation material, 21...Internal employment, 22...Outside employment, 23...Guide bar.

Claims (1)

[Claims] 1. Foam insulation injected from the back injection port of the space created by the outer box and the inner box, a refrigerator with a lid that closes the injection port, a recess provided in the outer box, and the inner box. An opening that also serves as a gas vent hole provided so that the shaft of the drive motor passes through the inside of the refrigerator, a heat insulating material attached to the opening, a gas vent hole provided in the inner box near the injection port, and a gas vent hole provided in the gas vent hole. 1. A method of manufacturing a heat insulating box body, comprising an attached heat insulating piece, the heat insulating material being sandwiched between the recess and the inner box.