JPH08121936A - Flat type refrigerating and cold storage showcase with viewing door - Google Patents

Abstract

PURPOSE: To prevent the condensation of dew on a viewing door by judiciously utilizing cold air in a showcase without using an antisweat heater and also the leakage of the cold air in the showcase when the door is opened in order to improve the cold insulation performance. CONSTITUTION: In a cold air circulating flat type showcase provided with a cooler 6 and an air blowing fan 7 on the side of the bottom part of a cold air circulating passage 5 defined in a top open type case body 1 and a viewing door 2 made in combination with a transparent door plate 2a at its upper part for covering the opening surface of an outer case and taking articles in and out of the showcase, a front cap 8 provided on the upper peripheral edge of the outer case as a means for blowing the cold air extracted from the inside of the showcase to the outer surface side of the viewing door to prevent the door surface from dewing and clouding is utilized as a plenum chamber for blowing off the cold air. And the front cap is provided in its upper surface with a cold air blow-off opening 8b for blowing out the cold air taken in the cap from the cold air circulating passage in the showcase to the upper surface of the front cap along the outer surface of the viewing door.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold air circulation type flat refrigeration system having a transparent door on the upper surface of a case body for loading and unloading products.
The present invention relates to a structure for preventing dew condensation on a refrigerated showcase, particularly a transparent door.

[0002]

2. Description of the Related Art First, FIGS. 3 and 4 show the structure of a flat-type refrigerating / refrigerating showcase with a transparent door, which is an object of the invention. In each drawing, 1 is a case body of a flat-type showcase with an open top surface, 2 is a triangular dome-shaped transparent door for loading and unloading products, which is constructed so as to cover the top surface of the case body 1,
The transparent door 2 is basically constructed by combining a sliding door type door plate 2a made of a transparent acrylic resin or the like. Also,
The case body 1 is provided with a cooler (evaporator of a refrigerator) 6, a blower fan 7 on the bottom side of a cool air circulation air passage 5 defined between an outer box 3 and an inner box 4 having an open top. Will be configured. The numeral 8 is a straightening vane incorporated in the corner of the cold air outlet. A cosmetic front cap 9 is attached to the upper peripheral edge of the outer box 3, and a rail 10 of the transparent door 2 is laid on the upper surface side thereof.

With such a structure, during operation, a cool air flow that has exchanged heat with the cooler 6 circulates in the cool air circulation air passage 5 as shown by an arrow, and a cool air curtain is blown out and formed on the upper surface of the case body 1 to form the inner box 4. Keep the products stored in. Further, the transparent door 2 always closes the door plate 2a to prevent high temperature outside air and dust from entering the inside of the refrigerator from the surroundings, and the door plate 2a is opened when the product is taken in and out. Even when the product is closed, the products stored in the refrigerator can be visually checked from the outside.

[0004]

By the way, the above-mentioned flat showcase with a transparent door has a problem of dew condensation on the transparent door 2. That is, the door plate 2a of the transparent door 2 is cooled by the cool air in the refrigerator to a low temperature, while the outer surface of the door plate 2 is in contact with ambient air at room temperature. For this reason, the outer surface temperature of the door plate 2a becomes lower than the dew point temperature of the ambient air, and dew condensation occurs on the door surface. As a result, the door plate 2a becomes cloudy and the products housed in the case are hard to see from the outside, and dew water generated by dew condensation travels down the door surface and flows down and accumulates in the groove of the rail 10. Is derived.

Therefore, as a measure for preventing dew condensation, conventionally, a dew condensation preventing means has been provided to prevent the door surface temperature from dropping below the dew point by installing a transparent dew-proof heater on the door plate 2a of the transparent door 2. However, if the area of the transparent door 2 is large as shown in FIG. 3, the door plate with the dew-proof heater becomes expensive and the power consumption of the dew-proof heater also increases. In addition, with the conventional configuration, when the door plate 2a of the transparent door 2 is opened during the cold insulation operation, the cold air inside the refrigerator leaks from the open surface, and the heat of the outside air easily enters the inside of the refrigerator.

The present invention has been made in view of the above points, and an object thereof is to solve the above-mentioned problems and prevent dew condensation on a see-through door without employing a dew-proof heater, and at the same time when the door plate is opened. Flat-type refrigeration with a transparent door that is cleverly configured to prevent cold air from leaking to the outside and improve cold storage performance.
To provide a refrigerated showcase.

[0007]

In order to achieve the above object, in the showcase of the present invention, means for preventing the dew condensation on the door surface by blowing cold air extracted from the inside of the refrigerator to the outer surface side of the transparent door. Here, the means for preventing dew condensation of the transparent door is such that the front cap provided on the upper peripheral edge of the outer box serves as a plenum chamber for blowing cold air, and the upper surface of the front cap is taken in from the circulating cold air ventilation passage inside the refrigerator. A cold air outlet that blows out cold air along the outer surface of the transparent door is opened.

[0008]

With the above structure, during the cold-keeping operation of the showcase, the cold airflow that circulates inside the inside of the inside by the wind force of the air blower fan (this cold airflow is cooled and dehumidified by the cooler and thus has low humidity). Part of the air flow is branched from the middle of the ventilation path and pushed into the inside of the front cap that functions as a plenum chamber for blowing cold air, and the air is blown from the cold air outlet opening on the upper surface along the outer surface of the transparent door. Blow out. The temperature difference between the cold air and the transparent door is much smaller than the outside air temperature, and the blowing cold airflow acts as an air curtain to shield the outer surface (low temperature) of the transparent door and make direct contact with the ambient air (high temperature). This prevents the occurrence of dew condensation on the door plate. Furthermore, even when the door plate of the transparent door is opened during the loading and unloading of products, the blowing cold airflow flowing along the open surface functions as an air curtain, suppressing the leakage of cold air in the refrigerator and the intrusion of outside heat. It works to prevent the deterioration of cold storage performance.

[0009]

Embodiments of the present invention will be described below with reference to FIGS. In the drawings of the embodiments, the same members corresponding to FIGS. 3 and 4 are designated by the same reference numerals. That is, in the illustrated embodiment, the front cap 8 that covers the upper peripheral edge of the outer box 3
So as to function as a plenum chamber for blowing cold air, the side wall surface of the front cap 8 for partitioning the cool air circulation air passage 5 inside the storage near the upper surface of the case body 1 has a cold air intake port 8a along the longitudinal direction of the case body. And a slit-shaped cool air outlet 8b is formed on the upper surface of the front cap 8 along the door plate 2a of the transparent door 2 toward the outer surface side thereof.

With such a configuration, during the cold-keeping operation of the showcase, a part of the cold airflow that circulates and circulates the cool air circulation air passage 5 by the blower fan 7 is the wind pressure (the static pressure in the duct on the air curtain outlet side, and the suction pressure on the suction side). While maintaining the dynamic pressure of the air curtain airflow, air is pushed into the front cap 8 from the middle of the ventilation passage 5 through the cold air intake port 8a, and is further blown through the cold air outlet 8b as shown by the arrow A. Is blown out along the outer surface of the door surface 2 to form an air curtain for the door plate 2.

As a result, the occurrence of dew condensation on the transparent door 2 and the fogging of the door surface due to the dew condensation can be avoided. Further, even when the door plate 2a is opened when the product is taken in and out, the blown-out cold airflow A functions as an air curtain, and the cold air inside the refrigerator leaks to the outside through the opening surface of the door plate or the outside heat enters the inside of the refrigerator. Suppress.

[0012]

As described above, according to the configuration of the present invention, the cold air extracted from the cold air circulation ventilation passage in the refrigerator is used for the transparent door constructed on the upper surface side of the flat-type refrigerating / refrigerating showcase. High cost by blowing out toward the outer surface of the plate,
Moreover, without attaching a dew-proof heater that consumes a large amount of power to the door plate, it is possible to satisfactorily avoid dew condensation on the surface of the door plate and fogging of the door surface due to dew condensation. When the door plate is opened, the cold air in the refrigerator leaks out and the heat from the outside is prevented from entering the refrigerator to improve the cold insulation performance.

[Brief description of drawings]

FIG. 1 is a sectional view showing the configuration of a showcase according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part in FIG.

FIG. 3 is an external perspective view of the entire flat-type showcase with a transparent door, which is an object of the present invention.

4 is a sectional view showing a conventional structure of the case body in FIG.

[Explanation of symbols]

 1 Case Main Body 2 Transparent Door 2a Door Plate 3 Outer Box 4 Inner Box 5 Cold Air Circulation Ventilator 6 Cooler 7 Blower Fan 8 Front Cap 8a Cold Air Inlet 8b Cold Air Outlet

Claims (2)

[Claims] 1. A cooler and a blower fan are provided on the bottom side of a cool air circulation air passage defined between an outer box of an open top type and an inner box, and the open surface of the outer box is covered to cover the upper side thereof. In a cold air circulation type flat freezing / refrigerating showcase equipped with a transparent door for loading and unloading products, which is a combination of a transparent door plate and
A flat-type freezing / refrigerating showcase with a transparent door, which is provided with means for blowing cold air extracted from the inside of the refrigerator to the outer surface side of the transparent door to prevent dew condensation on the door surface. 2. The showcase according to claim 1, wherein as a dew condensation preventing means of the transparent door, a front cap provided at an upper peripheral edge of the outer box serves as a plenum chamber for blowing cold air, and a circulation inside the refrigerator is provided on an upper surface of the front cap. A flat-type frozen / refrigerated showcase with a transparent door, which is characterized by opening a cold air outlet that blows cold air taken in from the cold air ventilation passage along the outer surface of the transparent door.