JPH0689982B2 - Low temperature showcase - Google Patents

Description

The present invention relates to a so-called dual type low temperature showcase in which an upper case with a front opening is installed in an upper part and a lower case with an upper opening is installed in a lower part. Relates to the improvement of the upper case.

2. Description of the Related Art Various showcases, such as Japanese Utility Model Publication No. 60-1976, have been devised as showcases having an opening for loading and unloading products on the front side and closing the opening with a door such as a transparent door. In this kind of so-called reach-in type showcase, there are many that adopt the cold air forced circulation method to cool the inside of the refrigerator,
Cool air flows from top to bottom in a direction substantially parallel to the opening, and an air curtain is formed by the cool air behind the opening to cool the inside of the refrigerator and outside air that tries to enter when the transparent door that closes the front opening is opened. On the other hand, a kind of wall is used to prevent the temperature inside the storage chamber from rising.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the general air curtain type showcases such as the above publications, the width of the cool air outlet is equal to or narrower than the width of the front opening. Therefore, the cool air uniformly blown out from the upper cool air outlet is the slowest in the vicinity of the side wall due to the influence of the flow path resistance due to the inner surface of the side wall of the showcase, and gradually increases in the width direction from the side wall side to the center. It had an unbalanced cold air flow velocity distribution. The slow flow velocity portion is the weakest portion against the invasion of the outside air, and there is a problem that the outside air easily intrudes from the side wall portion as compared with the central portion in the width direction of the opening. Also, in the case where a transparent door is arranged so as to cover the front opening, if the door is opened in an extremely short time such as taking out a single item, the outside air that enters is not so large as to cause a rise in the internal temperature, so Although there is no particular problem in terms of maintaining the internal temperature, the longer the door is opened, such as when selecting products while opening the door or when replenishing products in the refrigerator, the longer the time when the cold air flow velocity intrudes. There is a problem in that the amount of outside air becomes large and it becomes impossible to prevent the rise in the internal temperature.

Therefore, an object of the present invention is to provide a low temperature showcase configured to suppress the entry of outside air from the opening.

[Structure of Invention]

Means for Solving the Problems A low temperature showcase of the present invention includes a heat insulating wall having an opening on one side surface, and a partition plate arranged along the inner surface of the heat insulating wall,
A cool air passage formed between the partition plate and the heat insulating wall and having a blowout opening along one edge of the opening and a suction opening along the other edge of the opening, and a cool air passage in which a cooler and a blower are installed, and the partition A storage chamber surrounded by a plate, and an air curtain of cool air flowing from the blowout port toward the suction port inside the opening, and the opening lateral width of the cool air is provided on a pair of opposing side walls of the heat insulating box. The transparent transparent window is provided in front of the curtain and is inclined in a direction of narrowing the curtain.

As an operating air curtain, it causes an imbalance in the flow velocity distribution.However, by making the outlets wider than the width of the front opening, the opening edge is located in front of the extremely slow flow velocity. This is done to prevent the invasion of outside air from this extremely slow flow rate part.

In addition, the transparent window is inclined to a pair of opposite side walls of the heat insulating box in a direction in which the width of the opening is narrowed in front of the air curtain of the cool air, so that the portion where the flow speed of the cool air is slow is covered by the transparent window and the flow speed is slow. It suppresses the invasion of outside air by concentrating from the part.

EXAMPLES Examples of the present invention will be described below with reference to FIGS. 1 to 7.

(1) is an upper case (4) composed of a heat insulating wall (3) having an opening (2) for storing and taking out products on the front surface;
This is a so-called dual type low temperature showcase in which an opening (5) for storing and taking out products is formed on the upper surface and a main body is constituted by a lower case (7) constituted by a heat insulating wall (6).

The upper case (4) has two transparent doors (11) with handles (11A) that are rotatably supported by a pair of upper and lower hinges (10) to rotatably close the opening (2). As a plurality of shelves (14) and a lighting device, a partition plate (12) and a bottom plate (13) made of metal are provided in front of the heat insulating wall (3) at an appropriate distance from the inner surface of the refrigerator to provide a plurality of shelves (14) and lighting devices. A storage room (used for freezing in this example) (16) equipped with a fluorescent lamp (15), a plate fin type cooler (17) and an air blower (18) are installed, and a partition plate (12) and a bottom plate (13) are installed. ) And a heat insulating wall (3), and a blow-out port (20) and a suction port (21) that face each other along the upper and lower edges of the inside of the opening (2). . Opening (2) at the left and right ends of the insulation wall
Is provided with transparent transparent windows (22) inclined so as to be narrower than the space between the inner walls of the left and right opposite walls of the heat insulating wall (3), and both ends in the width direction of the air curtain are transparent windows (22). I try to touch the inner surface of. In this example, as shown in FIG. 1, the opening (frontage) of the upper case (4) (ratio) between the inner walls of the opposing left and right side walls of the heat insulating wall (3) (lateral width of the storage chamber (16)) ( In order to reduce the lateral width Q of 2), transparent windows (22) are provided at the ends of both side walls of the heat insulating wall so as to be inclined inward toward the outside. As a result, the width (horizontal width) R of the outlet (20) becomes larger than the opening width Q of the upper case (4), and the outlet (20) is formed inward of the opening (2). Moreover, both ends of the air curtain in the width direction are in contact with the inner surface of the transparent window (22).

Then, by forcibly circulating the air that has undergone heat exchange in the cooler (17) (this is called cold air) with the blower device (18) as shown by the arrow, from the outlet (20) to the inlet (21). A cool airflow, that is, an air curtain, is formed along the back surface of the transparent door (11) to cool the storage chamber (16). At this time, both ends of the air curtain in the width direction are in contact with the inner surface of the transparent window (22).

Reference numeral (25) is a door housing formed below the bottom wall (3E) of the heat insulating wall (3) and also serving as a lighting room, and a fluorescent lamp (26) as a lighting device for internal lighting of the lower case (7). Is provided in the front part thereof and accommodates a sliding door (30) of a lower case described later.

The lower case (7) has two walls, left and right, which are slidable in the front-rear direction with the ceiling wall (6A) in the rear half of the opening (5) of the heat insulating wall (6) and the front half inclined downward. The transparent door (30) as a sliding door, the handrail (31) as a handrail part made of light metal such as aluminum for decorating the three sides of the opening (5) of the heat insulating wall (6) are provided. A pipe-on-sheet type cooler (33) as a main cooler provided on the outer surface of the inner box (32) as an inner wall, and a roll bond type cooler as an auxiliary cooler provided under the ceiling wall (6A). The cold air heat-exchanged with (34) is naturally convected to cool the inside of the freezer compartment (35).

(40) is a machine room formed in the lower part of the heat insulation wall (6), and comprises a first fin (41) and a first compressor (41) which constitute a refrigeration cycle with the plate fin type cooler (17) of the upper case (4). Condenser (42), lower case main and auxiliary coolers (33), (3
4) and a second compressor and a second condenser which form a refrigeration cycle (not shown because both are hidden by the first compressor (41) and the condenser (42), respectively). ing.

In the upper case (4), the front end of the bottom wall of the heat insulating wall (3) is substantially in the center of the upper surface of the lower case (7), and the rear end of the bottom wall is behind the back wall of the heat insulating wall (6) of the lower case (7). It is configured so as to project to, and its side walls communicate with each other.

Next, the structure near the air outlet (20) of the upper case (4) will be described. The front end of the transparent window (outlet window) (22) fixed to the front end of the heat insulating wall (3) of the upper case (4) is a door strut. It is attached to the door frame (23) that doubles as the door frame (23).
The opening (5) of the bay window case (7) formed by the above is closed by a transparent door (11) which is rotatably supported by the door receiving frame (23). Reference numeral (24) is a door strut on which the inner surfaces of both doors (11) on the handle (11A) side abut.

The top wall (12A) of the partition plate (12) has a surface that is substantially the same as the direction of the flow of cold air in the portion corresponding to the top wall of the cold air passageway (19) and a surface that is different from the rear side to the front side. A plurality of holes (27) of appropriate shape (circular shape in this example) are provided so as to extend over both the same surface and different surfaces.
Has been formed.

The plurality of holes (27) guide a part of the cold air passing through the cold air passage (19) from the cold air passage (19) to the storage chamber (16) side along the lower surface of the top wall (12A) of the partition plate (12). To prevent the formation of dew on the lower surface of the ceiling wall.By forming the hole (27) across the same surface as the flow of cold air and a different surface, the holes are formed only on the same surface. Even when the opening areas are the same, the height of the same surface can be made smaller than that in the case of forming, and the storable height in the storage chamber (16) can be made larger than in the conventional case.

The width R of the outlet (20) is set to be larger than the width Q of the opening (2) formed in the door receiving frame (23), and in this example, it is formed to be about 20 mm wider on the left and right sides than the opening width. There is. FIG. 1 shows the flow velocity distribution of the air curtain when the bay window case (7) is viewed from the front at this time.

According to the above configuration, the width of the cool air outlet (20) in the horizontal direction is set to be larger than the width of the box front opening (2) in the horizontal direction by about 20 mm, so that the opening (2 ), The flow velocity distribution in the opening projection portion of the air curtain of the cool air located behind is uniform, and it is possible to avoid the concentration of the outside air that enters from the opening portion at the left and right ends of the opening when the door is opened. . Also, by making the flow velocity distribution almost uniform, it is possible to improve the efficiency of both the original function of the air curtain, that is, the effect of cooling the inside of the refrigerator and the effect of blocking the entry of outside air. It is possible to reduce the rise in temperature and the invasion of moisture. Further, as in this embodiment, by disposing the transparent window (22) so as to incline inward toward the front, it becomes possible to confirm the goods in the storage not only from the front but also from the oblique direction. The displayability can be improved.

On the other hand, by disposing the transparent window (22) at the front end of the heat insulating wall (3), the vicinity of the side wall where the flow velocity of the cool air blown out from the air outlet (20) is slow is covered by the transparent window (22). Invasion of outside air from the left and right portions of the front opening (2) of the upper case is suppressed.

In the above example, the showcase with a vertical door was described, but by using the showcase with the door removed, it is possible to apply it to a vertical open showcase. Application to a flat open showcase as shown in FIG. 7 is also possible.

〔The invention's effect〕

As described above in detail, according to the present invention, the box body is configured so that the width of the portion for blowing cold air, that is, the lateral width of the cold air outlet is larger than the lateral width of the front opening, so that the cold air is evenly discharged from the cold air outlet. Even if the blown out cool air has an imbalance in the lateral flow velocity distribution due to the resistance from the side wall, the left and right ends of the opening are not located near the side wall where the flow velocity is extremely slow compared to the center, so this flow velocity The invasion of the outside air from the slow portion is suppressed, and the rise of the temperature inside the refrigerator and the invasion of the moisture accompanying the invasion of the outside air can be reduced. For this reason, it is possible to provide a cooling function for the inside of the storage, which is the original purpose of the air curtain, and a barrier effect for the outside air that tries to enter through the opening, which helps to reduce the rise in the temperature inside the storage.

On the other hand, by forming a transparent transparent window, it is possible to cover the part of the cold air blown from the outlet with a slow flow rate by the transparent window, and it is possible to suppress the invasion of outside air from this slow flow rate part, and at the same time it is transparent. It is possible to prevent dew condensation on the window.

Further, the pair of opposed side walls of the heat insulating box is configured with a transparent window having a transparent property and a member whose lateral width of the opening is narrowed in the direction in which the width of the opening is narrowed in front of the air curtain of the cold air, thereby narrowing the field of view of the product in the case. Without, stable air curtain can be supplied.

[Brief description of drawings]

Each drawing shows an embodiment of the present invention, and FIG. 1 is a partially omitted sectional view showing a flow velocity distribution of cold air blown out from an outlet,
The figure is an external perspective view of a low temperature showcase, FIG. 3 is a sectional view taken along line AA of FIG. 2, FIG. 4 is a sectional view taken along line BB of FIG. 3, and FIGS. 5 and 6 are front views of the showcase. FIG. 7, a side view, and FIG. 7 are sectional views of a flat open showcase. (1) …… Low temperature showcase, (2), (5) …… Opening, (3), (6) …… Insulation wall, (4) …… Upper case, (7) …… Lower case, (20 ) …… Outlet, (22)
...... Transparent window.

Claims (1)

[Claims] 1. A heat insulating wall (3) having an opening (2) on one side.
And a partition plate (12) arranged along the inner surface of the heat insulating wall
And a blower port (20) formed between the partition plate and the heat insulating wall and extending along one edge of the opening and a suction port (21) extending along the other edge of the opening. A cool air passage (19) in which a blower (18) is installed, a storage chamber (16) surrounded by the partition plate, and an air curtain of cool air flowing from the air outlet toward the air inlet inside the opening. A low temperature showcase, characterized in that a transparent transparent window (22) is provided on a pair of opposed side walls of the heat insulating box, the transparent window (22) being inclined in a direction in which the opening width is narrowed in front of the cool air curtain.