JPH0144992B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a heat insulating box for refrigerators, low temperature storage cases, etc.

(b) Prior art Publication of Utility Model Publication No. 52-7890 (JPC, 70B41) states:
A refrigerated case is shown that includes an outer box having a bottom wall that slopes upward, and a machine room that is formed directly below the bottom wall and houses a compressor and a condenser.
Air warmed by heat radiated from the compressor and condenser is raised along the slope of the bottom wall to warm the guide rail and drain pipe, thereby preventing dew from condensing in these areas.

This configuration utilizes the sloped surface of the bottom wall of the outer box to promote the discharge of air warmed by the heat dissipation of the compressor and condenser, but the foaming process that fills the space between the inner and outer boxes with foam insulation material Sometimes, the slope of the bottom wall of the outer box causes uneven growth of the foam insulation, leading to poor foaming, so the formation positions of the injection hole for the raw solution of the foam insulation material and the exhaust hole that exhausts the air between the inner and outer boxes are changed. It became necessary to pay attention to the following.

(c) Object of the Invention The present invention aims to improve the prior art and uniformly grow the foamed heat insulating material during the foaming process to eliminate foaming defects.

(d) Structure of the invention Consisting of an inner box, an outer box having a bottom wall that slopes upward from the front or upward from the rear, and a foamed heat insulating material filled between the inner and outer boxes, and during the foaming process, the bottom wall is In an insulating box body formed of a main body and a machine room in which a compressor, a condenser, etc. are installed directly below the main body, the foam insulation is applied to the high slope area when the bottom wall is the bottom surface. An insulated box body with an injection hole for injecting the raw material solution, and an exhaust hole in the lower part to exhaust air between the inner and outer boxes to the outside.

(E) Embodiments of the Invention Figures 1 to 4 show embodiments of the present invention. In the figures, 1 is an insulating box such as a low-temperature show case used for selling ice cream, etc. The main body is composed of a heat insulating wall 4 equipped with a window 2 and two transparent doors 3A and 3B sliding in the front and rear directions on the left and right on the front half of the top surface, a machine room 5 below the main body, and a machine room 5 above the second half of the top surface. A storage chamber 6 is formed.

The heat insulating wall includes an inner box 8 made of metal with an open top that defines the interior 7 of the refrigerator, and an outer box made of metal with an open top that stores this inner box and forms a space between the inner box and the inner box. 9, and a foamed heat insulating material 10 made of hard polyurethane or the like which is foamed and filled into the space between the inner and outer boxes. As shown in FIGS. 3 and 4, the inner box has front, back, left, right, and bottom walls 8A to 8.
A main cooler 11 consisting of a meandering low-temperature refrigerant pipe provided on the outer circumferential surface of the main cooler 11, and a plate-shaped auxiliary cooler 12 formed by the so-called roll bonding method placed in the rear half of the upper surface. 7. Cool.
Further, the outer box has a heat exchanger 1 formed of a meandering refrigerant pipe through which a high temperature gas-liquid mixed refrigerant or liquid refrigerant flows on the inner surface.
5, a front wall 9A, a back wall 9B, and both left and right walls 9.
C, 9D, a bottom wall 9 that slopes gently upward to the rear and has injection holes 13 for the foamed heat insulating material at the rear edge, which is the high part, and an appropriate number of exhaust holes 14 at the front edge, which is the low part.
E, and an upper wall 9F that is located directly above the auxiliary cooler and slopes gently downward toward the rear, and prevents dew condensation on the front wall 9A in the heat exchanger.

The machine room 5 includes a lower part of the front wall 9A of the outer box, lower parts of both left and right walls 9C and 9D, a bottom wall 9E, an exhaust passage 16 that opens in the vertical direction at the upper edge, and is located below this exhaust passage. a removable cover 18 that forms an exhaust path 17 that opens in the front and back direction, and covers the back opening.
and a base 20 located at the rear of the lower surface and forming an intake passage 19 between the lower end of the front wall 9A of the outer box, and constituting a refrigeration cycle together with the main and auxiliary coolers. 21 based on 20,
A pair of supports 23A, 23 in which wire finch tube condensers 22 are provided at both front and rear edges of the intake passage.
They are each attached to B. The air warmed by the heat radiated from the compressor and condenser is guided from the intake path 19 to the machine room 5, rises along the slope of the bottom wall 9E as shown by the arrow in FIG. ,1
7 is discharged to the outside.

As shown in FIG. 1, the inner and outer boxes are fixed with inner and outer jigs (not shown) so that the bottom walls 8E, 9E of both boxes face upward during the foaming process. Note that 25 is a heat insulating block interposed between the auxiliary cooler 12 and the upper wall 9F, and 26 is a window formed on both left and right sides 8C and 8D of the inner box 8 for guiding the foamed heat insulating material 10 in front of the heat insulating block. be. This fixed inner and outer box 8,
In the space between 9 and 9, add foaming solution 1 such as hard polyurethane.
0' is injected through the injection hole 13 and foamed. This stock solution solidifies through the growth states of cream, gel, and foam, and becomes the foam insulation material 10. As the foam insulation material grows, the air between the inner and outer boxes 8 and 9 is reduced as shown in Figure 1. As shown by the arrow, the foamed heat insulating material 10 and the air are gradually pushed out from the exhaust hole 14 to the outside between the bottom walls 8E and 9E of the inner and outer boxes, which become the final foaming area. It is guided toward the exhaust hole 14, which is the final foaming point, along the slope of the bottom wall 9E, where the trailing edge is the lower part. In addition, during this foaming process, the wall thickness directly below the injection hole 13, that is, both back walls 8B and 9B, is adjusted in consideration of the growth rate and density of the foam insulation material 10
The wall thickness directly below the exhaust hole 14, that is, the front wall 8
The distance between A and 9A is smaller than that between A and 9A.

According to such a configuration, during the foaming process, the inclined bottom wall 9E of the outer box 9 becomes the upper surface, the rear edge where the injection hole 13 is formed is the low part, and the front edge where the exhaust hole 14 is formed is the high part. In addition, since the space between the inner box 8 and the bottom wall 8E is the final foaming area, and the exhaust hole 14 is the final foaming point, the bottom wall The foam insulation material 10 and air can be smoothly guided toward the exhaust hole 14 along the inclined surface 9E, and the air in the space can be reliably removed from the exhaust hole. As a result, the growth of the foam insulation material 10 can be prevented. Foaming defects due to unevenness and residual air can be prevented. Also, during operation of the refrigeration cycle, the bottom wall 9E of the outer box 9 becomes the lower surface, and the injection hole 13
The trailing edge where the exhaust hole 14 is formed is the high part, and the leading edge where the exhaust hole 14 is formed is the low part.
The air warmed by the heat dissipation in step 2 is smoothly discharged to the outside along the slope of the bottom wall 9E, and since both the injection hole 13 and the exhaust hole 14 are heated by the warmed air, the injection hole and the exhaust hole Foam insulation material 1 from the hole
It is possible to prevent moisture from entering the room.

FIG. 5 shows another embodiment of the present invention, in which the bottom wall 9E is tilted upward in the forward direction, and an injection hole 13 is provided at the front edge which is a high portion, and an exhaust hole 14 is provided at the rear edge which is a low portion. At the same time, an exhaust passage 17 is formed in the lower part of the front wall 9A of the outer box 9.

(F) Effects of the Invention Since the present invention is configured as described above, the following effects are produced.

During the foaming process, the inclined surface of the bottom wall of the outer box allows smooth flow of the foam insulation material and air, thereby preventing foaming failure of the foam insulation material.

During refrigeration cycle operation, the inclined surface of the bottom wall of the outer box allows air warmed by heat radiation from the compressor and condenser to be smoothly discharged to the outside of the machine room.

During refrigeration cycle operation, the injection hole and exhaust hole are heated with air warmed by heat radiation from the compressor and condenser, so moisture can be prevented from entering the foam insulation material from the injection hole and exhaust hole.

[Brief explanation of drawings]

The drawings all show examples of the insulating box of the present invention,
Figure 1 is a longitudinal sectional view during the foaming process, Figure 2 is a front perspective view, Figure 3 is a sectional view taken along line A-A' in Figure 2, Figure 4 is a sectional view taken along line B-B' in Figure 5, and Figure 5 is a sectional view taken along line A-A' in Figure 2. The figure is a longitudinal sectional view showing another embodiment. 5... Machine room, 8... Inner box, 9... Outer box, 9E... Bottom wall, 10... Foam insulation material, 21... Compressor, 22... Condenser.

Claims (1)

[Claims] 1. A main body consisting of an inner box, an outer box having a bottom wall that slopes upward from the front or upward from the rear, and a foamed heat insulating material filled between the inner and outer boxes, with the bottom wall serving as the upper surface during the foaming process; In this insulating box that forms a machine room in which a compressor, condenser, etc. are installed directly below the main body, the undiluted solution of the foam insulation material is injected into the high slope area when the bottom wall is the bottom surface. The insulating box body has an injection hole to drain the air from both the inner and outer boxes to the outside, and an exhaust hole in the lower part to exhaust the air between the inner and outer boxes to the outside.