JPS6312234B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field The present invention provides a see-through structure that cools the interior of a refrigerator defined by a heat insulating box with an open top surface using both first and second coolers, and that covers the top opening. This invention relates to a face-to-face low-temperature show case equipped with a transparent door located at the upper part of the rear half of the top opening.

(B) Background art and its problems The refrigerating case shown in Japanese Utility Model Application Publication No. 53-64374 is generally referred to as a face-to-face sales type, and the cooler is installed on the outer surface of the inner box, which is the inner wall of the insulated box. The interior of the refrigerator is cooled by the cold air that undergoes heat exchange and natural convection, and goods are stored in and taken out from the interior of the refrigerator by opening a transparent door provided at the upper part of the rear half of the top opening and inclined backwards.

According to such a configuration, the cold air that cools the inside of the refrigerator flows along the inner wall to lower the temperature, flows upward through the center of the refrigerator to cool the products, and then flows through the upper part of the interior of the refrigerator and returns to perform convection. . If the transparent door is opened during this convection, the moisture from the outside air that has entered the upper part of the refrigerator will accumulate as frost on the upper part of the rear wall of the insulation box.If the transparent door is opened frequently, the frost will grow and grow inside the refrigerator. This not only impairs the display effect of overhanging products, but also impedes storage and removal of products.

(c) Purpose of the present invention The lower part of the load line is cooled by a first cooler, and the upper part is cooled by a second cooler, and the cold air heat-exchanged in the second cooler is convected so as to have an exhalation effect, and the upper surface is opened. The purpose is to reduce frost formation on the periphery.

(d) Embodiments of the present invention Reference numeral 1 shown in FIGS. 1 to 3 is a face-to-face sales type low-temperature show case, which includes both an inner and outer box, an insulating box 2 with an open upper surface made of foamed heat insulating material, and an upper surface of this insulating box. The main body is constituted by a transparent structure 3 arranged to cover the opening. The heat insulating box has a front wall 4, a protrusion 7 projecting rearward at the top, a rear wall 5 having an opening 9 at the bottom closed by a heat insulating door 8, and left and right side walls whose top surfaces slope downward toward the front. 6, 6, and a top wall 11 made of a moisture-resistant heat insulating material, which is arranged on the upper part of the rear wall and defines a recess 10 together with the protrusion 7, and a meandering part arranged on the back side of the side wall of the inner box. The interior 14 of the refrigerator where the partition plate 13 is disposed is cooled by the cool air that undergoes heat exchange in the first cooler 12 consisting of a shaped cooling pipe and naturally convects as shown by the chain line arrow in FIG. The load line 15 is heated by the plate-fin type second cooler 16, which is disposed in the recess 10 located at Aims to cool the upper space inside the refrigerator. Reference numeral 17 indicates a dew pan placed directly below the second cooler 16. Reference numeral 19 indicates a defrosting device such as a defrosting heater placed in the second cooler 16. Reference numeral 19 indicates a defrosting device such as a defrosting heater placed in the second cooler 16. It is a breathable guard. Note that 21 is a machine room in which a refrigerant compressor, a condenser, etc., which together with the first and second coolers constitute a refrigeration cycle, are installed.

The transparent structure includes a front plate 22, a top plate 23, left and right side plates 24, 24, each made of transparent glass, and two transparent doors 25, 25' of different sizes, which are sliding left and right and are mainly made of transparent glass. , as shown in FIG. 4, is composed of a pair of left and right support members 26, 26 that support these plates and the transparent door. This support member is made of a thin metal plate bent into a U-shape to form a groove 27.
A hole 3 opposite to the holes 28, 29, 30 formed at the upper ends of the side plates 24, 24 and at both ends of the top plate 23.
1, 32, and 33, and includes an upper portion 26A extending forward, an inclined portion 26B inclined backwardly from the rear end of this upper portion, and two holes 34 extending rearward from the lower end of this inclined portion. The lower part 2 formed
It consists of 6C. 35 and 36 are both support members 26,
The upper rail 35 is a metal upper and lower rail that also serves as a reinforcing member to interconnect the transparent doors 25 and 26, support the transparent doors 25 and 25' at an angle backward, and guide them in the left and right direction.
Both ends of the lower rail 36 are fitted into grooves 27 located at the upper corners of the upper portions 26A and the inclined portion 26B of the support members 26, 26, and both ends of the lower rail 36
The support members 26 and 26 are fitted into grooves 27 located at the lower corners of the inclined portion 26B and the lower portion 26C, and fixed to the support members 26 and 26 by means such as welding. 47 is a stopper for fixing both support members 26, 26 to the insulation box 2; 49, 50 are both support members 26, 2;
6 includes male and female fasteners for fixing the front plate 22, top plate 23, and side plates 24, 24, and 51, 51 are washers.

According to such a configuration, among the cold air in the refrigerator interior 14, the cold air below the load line 15 is transferred to the first cooler 1.
2, the inner box is kept at a low temperature and comes into contact with the surface of each peripheral wall to exchange heat and increase its density.The inner box first descends along the surface of the peripheral wall, and then the partition plate 13
Or, it flows laterally along the surface of the bottom wall of the inner box, and during this time, the load (product) stored in the chamber 14
As it is cooled, heat is gradually removed and the density becomes smaller, and then it merges at the center of the surface of the partition plate 13 or the bottom wall of the inner box, rises, and then branches laterally radially, as shown by chain lines in Figure 3. The cold air is circulated, so-called natural convection, and the load stored in the refrigerator 14 is cooled to a predetermined temperature by this natural convection. On the other hand, among the cold air inside the refrigerator 14, the load line 1
5, the cold air above the load line 15 undergoes heat exchange with the second cooler 16 and has a higher density. Since the density of the cold air is slightly smaller than that of the cold air, the cold air below the load line 15 flows forward, and during this time, the transparent structure 3
The temperature gradually rises due to the radiant heat that passes through the chamber, the density decreases, and the circulation shown by the solid line in Fig. 3 turns around above the front of the chamber 14 and flows toward the rear.
So-called natural convection occurs, and the naturally convected cool air leads the moisture contained in the outside air that has entered the warehouse interior 14 when the door is opened to the second cooler 16, where it is deposited as frost. This frost is removed by the defrosting device 18 provided in the second cooler 16 during defrosting.

That is, the cold air heat-exchanged in the first cooler 12 acts to cool the load stored in the refrigerator interior 14 to a predetermined temperature, and the cold air heat-exchanged in the second cooler 16 acts to cool the load stored in the refrigerator 14 to a predetermined temperature. This acts to prevent heat load and moisture from entering into the cold air that has been heat exchanged.

Therefore, the moisture that has entered the upper part of the refrigerator interior 14 due to the opening of the transparent doors 25, 25' will be absorbed by the load line 15.
By the exhalation of the cold air crossing the upper part, it is forcibly guided to the second cooler 16 and deposited as frost, which prevents the temperature of the cold air at the lower part of the load line 15 from rising, and also prevents frost from forming on the periphery of the upper opening. Therefore, it is possible to prevent frost from deteriorating the display effect and inhibiting sales activities. Also, in the recess 10 there is a second
By arranging the cooler 16, a wide upper opening area can be secured.

(E) Effect The cold air crossing the upper part of the load line protects the cold air at the lower part, and when the door is opened, the frost action forcibly guides the invading moisture to the second cooler, and the moisture is absorbed around the periphery of the upper opening. It is possible to reduce frost formation, thereby preventing a decline in display effects and inhibiting sales activities.

[Brief explanation of the drawing]

The drawings show an embodiment of the low-temperature show case of the present invention, in which Fig. 1 is a perspective view, Fig. 2 is a rear view, Fig. 3 is a sectional view taken along line A-A' in Fig. 1, and Fig. 4 is an exploded perspective view of the see-through structure. It is a diagram. 2...Insulation box, 3...See-through structure, 10...Recess, 12...First cooler, 14...Inside the refrigerator, 15...
...Load line, 16...Second cooler, 18...
Defrost device, 25, 25'...transparent door.

Claims (1)

[Claims] 1. A heat insulating box consisting of both an inner and outer box and a foam insulation material, with a load line set on the upper surface of the inner box and an open top surface, and a meandering cooling pipe arranged on the back side of the side wall of the inner box. 1 cooler and this first
A plate fin type second cooler with a defrosting device disposed in a recess formed in the upper part of the rear wall of the insulation box, which has a lower heat exchange amount than the cooler and is located higher than the load line; A transparent top plate located at the top of the front half of the top opening, and a transparent door disposed at the top of the second half so as to be inclined downward, the lower end of which is located at the top of the second cooler, and covers the top opening. A low-temperature case consisting of a see-through structure.