JPH0336870Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is an improvement of a flat open show case in which an air curtain consisting of a cold air flow is formed at the top opening, and an air curtain consisting of a protective air flow is formed above the opening. Regarding.

(Prior Art) Conventionally, the one shown in FIG. 2 is known as this type of flat open case. In FIG. 2, 1 is a case body made of a heat insulating material, and a cold air circulation duct 3 is defined between it and an inner box 2, and a cooler 4 and a blower 5 are installed inside the duct. The inside of the inner box 2 serves as an interior space 6 for displaying products. The upper surface of the case body, that is, the cabinet 1, is an opening, and an air outlet 7 is provided on one side, usually the back side, and a suction port 8 is provided on the opposite side, the front side. 3 to form an air curtain A to keep the products in the refrigerator cold.

Further, a table counter 9 is installed above the air outlet 7, thereby forming a duct for the outside air flow on the back part of the outer periphery of the case body, and a blower 10 is installed inside the table counter 9, and the air outlet 11 is installed in the front of the table counter 9. is provided, and a protective air curtain C is formed above the air curtain A by outside air in the same direction as the air curtain A.

(Problem to be solved by the invention) The air curtain made of cold air absorbs outside air by its entrainment action and reaches the suction port 8 as a mixed cold air flow with outside air, but the air curtain has a volume corresponding to the amount of the absorbed outside air. The amount cannot be collected at the suction port and is discharged to the outside. This accumulated cold air on the floor of the store is called a cold aisle. Since the protective air curtain is made of air that has accumulated on the floor surface including the cold aisle, it contains dust that has accumulated on the floor surface, and there is a problem that such dust is dispersed into the refrigerator interior 6. Ta. Furthermore, when the cold air mixed with outside air drawn in by the air curtain A passes through the cooler 4, moisture in the outside air adheres to the cooler and becomes frost, impeding the heat exchange performance of the cooler and lowering the internal temperature. There was a drawback that the cooling performance decreased because of the increase in temperature.

The purpose of the present invention is to solve the above-mentioned problems of the prior art, and to provide a flat open case that prevents dust from dispersing into the refrigerator and has excellent cold storage performance.

(Means for Solving the Problems) The configuration that characterizes the flat open show case according to the present invention is that the top of the air curtain consisting of a cold air flow on the side of the suction port is set at a higher position than the air outlet, and The height from the mouth to the top above the mouth is such that the air coming out of the air outlet and the lower ventilation opening described later is retained and flows back to the upper ventilation opening described below. In order to circulate the air through these vents, the cold air is blown out from the lower vent parallel to the air curtain and sucked in from the upper vent. In this way, a blower was installed inside the table counter.

(Operation of means for solving the problem) A mixture of cold air and outside air equivalent to the amount of outside air drawn in by the air curtain consisting of a cold air flow at the top opening of the case is discharged at the suction port, but Since the suction port side is higher, the mixed air remains at that position and is moved in the opposite direction above the air curtain by the blower inside the table counter, and is sucked in from the ventilation port above the table counter and then lowered. The air is blown out from the side ventilation holes close to the upper side of the air curtain in the same direction, and a protective air curtain consisting of a circulating flow of mixed air is formed above the air curtain.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings, in which the same members as those of the conventional device described above with reference to FIG. 2 are designated by the same reference numerals. As shown in FIG. 1, this flat open case also has a duct 3 defined between the case body 1 and the inner box 2, in which a cooler 4 and a blower 5 are installed. Cold air is blown out from the blow-off port 7 on one side to the suction port 8 on the other side to form an air curtain A. Further, a table counter 9 is installed above the air outlet 7, and a blower 10 is installed therein to form a protective air flow.

In this flat open shower case, as shown in FIG ^. 1, the height level H2 of the top on the suction port ⁸ side is set higher than the height level H1 of the air outlet 7.
The height difference h is such that the air mixture that is not absorbed by the suction port 8 is prevented from being discharged to some extent. Furthermore, ventilation ports 12 and 13 are formed on the side surface of the inside of the table counter 9, which are arranged vertically. When the blower 10 inside the table counter 9 is operated, the upper ventilation port 12 becomes a suction port, and the lower ventilation port 13 The blower 10 is arranged so that the air outlet is the air outlet. Note that this table counter 9 is not provided along the back surface of the case body 1, but is located only above the air outlet 7, and therefore its internal space is located above the air outlet 7.

During operation, an air curtain A consisting of a cold air flow is formed at the top opening of the show case, and the mixed air of cold air and outside air corresponding to the amount of outside air drawn in there has a higher specific gravity than the outside air and flows from the air outlet 7 to the suction port. Since the top of 8 is raised, it stays above the suction port 8. Then, by operating the blower 10 in the table counter 9, the mixed air is blown out from the lower ventilation port 13 in parallel and in the same direction as the air curtain A, and at the same time, the mixed air staying above the suction port 8 flows back as shown by arrow B. Suction is drawn through the upper ventilation opening 12, thus creating a small circulation flow as a protective air flow in the volume space of height h above the air curtain A.

Incidentally, by making the interval between the ventilation ports 12 and 13 as large as possible, or by setting the speed of the air blown from the ventilation port 13 to an appropriate value, the occurrence of short cycles between the ventilation ports can be prevented. Even if the blower 10 is stopped during defrosting or when the night cover is attached, the cooling performance is maintained.

(Effects of the invention) Therefore, according to the invention, a protective air curtain consisting of a circulating flow of mixed air is formed above the air curtain consisting of a cold air current, so there is little entrainment or intrusion of outside air, and an excellent Has cold storage performance. Furthermore, since the protective air flow does not use the air stagnant on the floor surface, it is possible to prevent dust from entering the refrigerator. Moreover, there is no need to form a duct between the back of the main body and the table counter, resulting in cost savings.

[Brief explanation of the drawing]

FIG. 1 is an elevational cross-sectional view of a flat open shoe case according to an example of the present invention, and FIG. 2 is an elevational cross-sectional view showing a conventional example. In the figure, 7... air outlet, 8... suction port, 9... table counter, 10... blower, 12, 13...
...Ventilator, A...Air curtain, B...Protective air curtain.

Claims (1)

[Scope of utility model registration request] A flat open show with an air outlet on one side of a top opening and an air inlet on the opposite side to form an air curtain of cool air at the opening, and a table counter above the air outlet. In the case, vertically arranged ventilation holes are formed on the inside of the table counter to form a circulating flow of protective air above the air curtain;
Further, a blower is installed inside the table counter so as to blow out the cold air from the lower ventilation port in parallel with the air curtain and suck air from the upper ventilation port, and the top on the side of the suction port is higher than the airflow port. When set at the position, the height from the suction port to the top thereof is such that air exiting from the blowout port and the lower ventilation port is retained and flows back to the upper ventilation port. A flat open case featuring