JPS6148069B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a cooling box that forms a low-temperature air curtain along the inside of a transparent door that closes an opening. The purpose of this invention is to prevent the liquid from adhering to the inner surface of the transparent door, to improve the lighting effect inside the refrigerator, and to improve the rectification characteristics of the cold air forming the air curtain.

Utility Model Application Publication No. 54-80075 (70B3) discloses that the main body is composed of an inner box made of synthetic resin with a front opening, an outer box, and a foamed heat insulating material filled between the inner and outer boxes. A cooling box in which a partition plate is arranged at an appropriate interval from the inner wall of the box to form a cold air passageway and a storage chamber in which a cooler and a blower are arranged, as well as an outlet and an inlet for forced circulation cold air. In the body, a convex part with a mounting part for a transparent cover covering the fluorescent light on the front and a guide part for forced circulation cold air on the back is integrally formed on the upper surface of the inner wall, and the inside of the convex part is filled with a foam insulation wall. A cooling box body characterized by the following is disclosed.

According to such a configuration, the gap between the transparent door body and the air curtain that is formed at the front of the storage room by the forced circulation cold air flow caused by the formation of the convex portion becomes smaller as it goes downward. A gradually narrowing space is formed, and in the turbulent region past the core region where the cold air flow forming the air curtain can maintain its initial blowing velocity, this cold air flow comes close to the inner surface of the transparent door body, causing the so-called The Coanda effect occurs, and the lower inner surface of the transparent door body is directly cooled by the cold air flow, and as a result, condensation occurs on the lower outer surface of the transparent door body, reducing the transparency effect inside the refrigerator and causing the transparent door to cool down. Heat loss of the cold air through the body resulted in an increase in refrigeration load. In addition, since the front part of the protrusion is equipped with a fluorescent light, the light from the fluorescent light is blocked by the protrusion, resulting in poor lighting effects, especially for products placed on the shelf. also occurred.

The present invention has been made in view of the above drawbacks.

Embodiments of the present invention will be described below based on the drawings. Reference numeral 1 denotes a cooling box body called a reach-in refrigerator or a case, and a heat insulating wall 2 constituting the main body.
A door unit 4 consisting of a frame 4A defining an opening 3 for storing and taking out products, and a rotatable transparent door 4B that freely opens and closes the opening is disposed on the front surface of the insulating wall. A refrigerator interior 7 comprising a plurality of shelves 6 with partition plates 5 disposed at appropriate intervals from the inner wall and serving as an inner box, and a cold air passage 10 in which a cross-fin type cooler 8 and an axial blower 9 are installed. Both air outlet and suction ports 11, 1 are located opposite to each other at both upper and lower ends of the front surface inside the refrigerator.
2, and the cold air heat-exchanged by the cooler 8 is forcedly circulated by the blower 9 as shown by the arrow to form a low-temperature air curtain AC to cool the inside 7 of the refrigerator.

Reference numeral 13 indicates a 10 cm to 30 cm low-pressure area located directly below the forward-downwardly inclined slope 2C formed at the front of the ceiling wall 2A of the heat insulating wall 2, and formed as a low pressure area between the transparent door 4B and the air curtain AC. This space is wide enough to prevent the Coanda effect, and light sources 14A and 14B, such as fluorescent lights, for illuminating the interior 7 of the refrigerator are installed horizontally at both upper and lower ends of the space so as not to be visible from outside the refrigerator. The width of this space is set according to the speed of the air curtain AC, such as the width of the outlet side or the center, which is the core region where the speed of the cold air flow is high, and the width of the center or suction side, which is the core region where the speed of the cold air flow is slow and turbulent. It is preferable that the distance is sufficient to prevent the outer part of the air curtain AC from coming into contact with the back surface of the transparent door 4B even if deflection due to the Coanda effect occurs in the air curtain AC. 15 is the inclined portion 2B of the heat insulating wall 2;
A reflecting plate 16 is disposed along the inner upper part of the opening 3 and serves as a guide plate forming the outer part of the air outlet and a mounting plate for the light source 14A. A light source 14 is disposed along the inner lower part of the opening 3 so as to face each other.
A translucent shade plate that covers the air curtain AC and guides the cold air flow downstream of the air curtain AC to the suction port 12.
The Coanda effect prevention space 13 is formed by protruding in the 7 direction inside the refrigerator from the inner surface of the front wall 2C of the heat insulating wall 2.

Reference numeral 17 denotes a dew-proof air curtain forming passage formed by the inclined part 2B of the ceiling wall 2A of the heat insulating wall and the duct plate 18, and inside thereof there is an axial flow type blower 20 with a propeller fan provided at the suction port 19 and the light source. A ballast 21 is installed, and its air outlet 22 has a blowing speed of 5 m/s, for example, along the surface of the transparent door 4B.
In order to maximize the downstream velocity of the dew-proof air curtain GA flowing below, it should be spaced 5 mm to 200 mm from the surface extension line of the transparent door 4B, and at a distance of 1° to the surface.
The tilt angle is set at 45°.

According to such a configuration, as the reflector plate 15 and the shade plate 16 protrude toward the inner side of the refrigerator than the inner surface of the heat insulating wall 2, the air outlet 11 and the air curtain AC which blow out cold air forming the air curtain AC.
By locating the suction port 12 for sucking the cold air formed in the refrigerator 7, it is possible to form a Coanda effect prevention space 13 of a predetermined width between the outside flow of the air curtain AC and the back surface of the transparent door 4B. Since the downstream region, which becomes a turbulent region and tends to come into contact with the back side of the transparent door 4B, can be separated from the transparent door 4B by the shade plate 16, the downstream region of the air curtain AC has turbulent flow in the direction of the transparent door 4B. Even if deflection occurs, the air curtain AC contacts the transparent door 4B and the transparent door 4B accompanying this contact
As a result, it is possible to improve the cooling effect of the air curtain (AC) on the inside of the refrigerator 7, and furthermore, both the reflector plate 15 and the shade plate 16 can be removed from the inner surface of the heat insulating wall 2. The above-mentioned cooling effect can be improved with a simple structure of protruding inward.

Furthermore, by providing the light source 14 at a position directly below the reflection plate 15 and at the upper part of the inside of the opening 3, which is a Coanda effect prevention space 13 that is a low pressure area,
Light source 14 using cold air blown out from the air outlet 11
In addition to avoiding direct cooling of the air curtain A, by providing the light source 14B covered by the shade plate 16 at the lower part of the inside of the opening 3, the air curtain
It is possible to avoid direct cooling of the light source 14 by the cold air that forms AC and returns to the suction port 12, and it is possible to prevent a decrease in the illuminance of both light sources 14A and 14B, and to improve the lighting performance. Since both light sources 14A and 14B face each other at the upper and lower parts of the inside of the opening 3, the interior 7 of the refrigerator can be illuminated from both the upper and lower sides, thereby improving the illumination effect of the interior 7 of the refrigerator.

Furthermore, the front wall 2A of the heat insulating wall 2 has a front downward slope 2B formed at the front, and the reflection plate 15 that forms the outer part of the air outlet 11 is provided directly below this slope. Not only can it be used as a component of the air outlet 11, but also the inner surfaces of the inclined part 2B and the reflecting plate 15 have an obtuse angle relationship, so that the flow of cold air from the inclined part 2B along the reflecting plate 15 becomes smooth. Improves rectification characteristics of air curtain AC.

According to the present invention described above, the effects listed below are produced.

A space to prevent the Coanda effect can be formed between the transparent door and the air curtain by the reflective plate and the shade plate, which respectively protrude from the inner surface of the heat insulating wall to the inside of the refrigerator. The supplied cold air blown out and the return cold air sucked into the suction port by forming an air curtain can be separated from the transparent door.As a result, the cold air forming the air curtain is prevented from coming into contact with the transparent door. It is possible to prevent contact with the transparent door caused by the turbulent downstream region, and improve the cooling effect of the air curtain inside the refrigerator.

The reflector plate and the shade plate prevent cold air from directly cooling the upper and lower light sources provided at the upper and lower parts of the inside of the opening, thereby preventing a decrease in the illuminance of both light sources and improving lighting performance. Moreover, by using both light sources, the inside of the refrigerator can be illuminated both from above and below, thereby improving the illuminance effect.

Since the cool air blown out from the outlet can be guided at an obtuse angle by the inclined portion and the reflecting plate, the rectification characteristics of the cold air forming the air curtain are improved.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of the cooling box body of the present invention. 2...Insulation wall, 2A...Ceiling wall, 2B...Slanted part, 2C...Front wall, 3...Opening, 4B...Transparent door, 7...Interior, 11...Blowout outlet, 12... ...Suction port, 13...Coanda effect prevention space, 14A, 1
4B...Light source, 15...Reflector, 16...Shade plate, AC...Air curtain.

Claims (1)

[Claims] 1. A heat insulating wall having a front part of the ceiling wall formed with a sloped part that slopes forward downward, a transparent door formed in the front face of the heat insulating wall that freely opens and closes an opening for storing and taking out products, and said opening. a reflector located at the upper inner side of the opening and directly below the slope, and protruding from the inner surface of the slope to the inside of the refrigerator to form an outer part of the cold air outlet; and at the lower inner side of the opening and the width of the opening. facing the reflective plate with a larger distance therebetween;
a translucent shade plate that protrudes from the inner surface of the front wall of the heat insulating wall toward the inside of the refrigerator and forms an outer portion of the cold air suction port; and a low-temperature air curtain that flows from the air outlet toward the suction port to cool the inside of the refrigerator. , a Coanda effect prevention space of a predetermined width formed by the air curtain, the transparent door, the reflector and the shade plate, and a space disposed directly below and close to the reflector and inside the opening. A cooling box body comprising a light source located at an upper part, and a light source covered by the shade plate and located at a lower part inside the opening.