JPH11257819A - Low-temperature show case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen the temperature difference between the accommodated substances by the side of a refrigerator room wall and the accommodated substances away from the refrigerator room wall, and equalize the temperature difference in the goods in the refrigerator quickly, by annexing a heat pipe to a middle partition plate, in a low-temperature show case which is equipped with a middle partition plate in the refrigerator room. SOLUTION: A low-temperature show case used for the sale of ice cream or the like has a heat insulating box, and the refrigerator room is provided with a middle partition plate 13 to partition the refrigerator room. At this time, the partition plate 13 is provided with a heat pipe 15, and the inside is charged with working fluid from a pinch part 17. For this heat pipe 15, when a temperature difference occurs in this, the working fluid evaporates on the side where the temperature is high and it separates from the interior, and at this time, it robs the ice cream on high temperature side of latent heat for evaporation. Then, the evaporated working fluid shifts to the low-temperature part, and it gives heat for liquefaction to the ice cream which is condensed and cooled at the face low in temperature, and functions to dissolve the temperature difference by repeating the cycle of liquefaction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a partition plate for a low-temperature showcase.

[0002]

2. Description of the Related Art Generally, in a low-temperature showcase,
BACKGROUND ART It is known that a partition plate is used to partition a storage room. These partition plates are usually net-like steel wires joined by electric welding and processed with resin. Further, a low-temperature showcase provided with an auxiliary cooler for preventing overcooling or the like of the upper part of the storage room is also known (Japanese Patent Publication No. 6-3 / 1994).
No. 5906). Further, there is also known a low-temperature showcase or the like in which an auxiliary cooling plate and a partition plate are integrated and both are used.

[0003]

However, since the usual partition plate is a net-like one, although air flows between the left and right of the compartment, there is a problem that it is difficult to make the temperature of the entire compartment uniform. In particular, in a low-temperature showcase, since the contents of the storage compartment are cooled by cooling the surface of the storage compartment box, the cooling effect is weak at a position distant from the surface of the storage compartment box, and the temperature tends to be higher than the vicinity of the storage compartment box. Therefore, conventionally, in order to set a predetermined temperature at a position distant from the surface of the box in the compartment, the vicinity of the box in the compartment has to be excessively cooled.

Further, even in the case of a low-temperature showcase provided with an auxiliary cooler, it is possible to prevent overcooling of the upper part of the storage room, but it is not possible to make the temperature of the storage room contents uniform.

Further, even in the case of a low-temperature showcase in which an auxiliary cooling plate and a partition plate are integrated and both are used, since the position is fixed, the position cannot be moved and an arbitrary partitioning position depending on the amount of stored commodities. There was a problem that can not be set.

Accordingly, an object of the present invention is to provide an inexpensive low-temperature showcase that can make the temperature of the storage room uniform without excessive performance, and at the same time, the position of the partitioning plate can be moved so that it can be adjusted according to the amount of stored goods. It is an object of the present invention to provide a low-temperature showcase in which an arbitrary break position can be set.

[0007]

According to the first aspect of the present invention,
In a low-temperature showcase with a partition in the storage room,
The heat pipe is attached to the middle partition plate.

According to a second aspect of the present invention, in the low-temperature showcase according to the first aspect, a wick is formed on an inner wall tube of the heat pipe.

According to a third aspect of the present invention, in the low-temperature showcase according to the first or second aspect, the storage room of the showcase is cooled by natural convection.

According to these inventions, since the heat pipe is attached to the partition plate, when a temperature difference occurs in the heat pipe, the working fluid is vaporized on the high temperature side and separates from the inner surface. Deprives the latent heat of the outside. The vaporized working fluid moves to a low temperature part, condenses on a surface having a low temperature, and gives heat to the outside to liquefy. By repeating this cycle until the temperature difference disappears, it is possible to reduce the temperature difference between the storage material near the storage room wall and the storage material away from the storage room wall at low cost without making the low-temperature showcase excessive performance. In addition to the above, it is possible to reduce a temperature difference due to a difference in the vertical position of the stored product which is likely to occur in the natural convection type low temperature showcase. Further, since the position of the middle partition plate can be moved, an arbitrary break position can be set according to the amount of the stored commodities and the like.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an external view of a low-temperature showcase according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA '' of FIG. 1. In these figures, reference numeral 1 denotes a low-temperature showcase. The low-temperature showcase 1 is mainly used for selling ice cream and the like in stores.
The heat-insulating box 3 is provided with a see-through window 5 in the upper front part, and two transparent doors 7 and 9 which can be opened and closed in the front half of the upper surface.

As shown in FIG. 2, the heat insulation box 3 is formed by filling a foam insulation between an outer box 39 and an inner box 41. A main cooler 47 composed of a meandering low-temperature refrigerant pipe is provided on the outer peripheral surface of the inner box 41.
From the upper part of the back wall 41a toward the see-through window 5
Extends to almost the center of the storage room 11, and an auxiliary cooler 45 is provided on the lower surface of the protruding wall 43. A storage room 33 is provided above the projecting wall 43 and in the rear half of the upper surface of the heat insulating box 3.

On the other hand, a machine room 31 is provided below the heat insulating box 3, and a refrigerant compressor 35 and a wire tube type condenser 37 are housed in the machine room 31.

The compartment 11 of the heat insulating box 3 is provided with an intermediate partition plate 13 for partitioning the compartment 11. As shown in FIGS. 3 and 4, the middle partition plate 13 is provided with a heat pipe portion 15 having a pipe-shaped space inside, and the heat pipe portion 15 is formed by an aluminum roll bonding method (described later). It is formed. A working fluid is sealed in the heat pipe portion 15 from a pinch portion 17 provided at the lower center of the partition plate 13. On the left and right sides of the pinch portion 17, supports 19 and 21 for supporting the partitioning plate 13 bent in opposite directions are provided.

Further, this heat pipe section 15
As shown in the figure, a groove-like groove wick is formed on the inner wall of the space, expanding the inner wall area to increase the area where the working fluid spreads, and devising so that the working fluid quickly reaches the upper part of the pipe by capillary action Have been.

In this embodiment, the heat pipe 15
Is formed by a so-called aluminum roll bonding method in which two aluminum plates are pressed. In this aluminum roll bond method, a paint for preventing pressure bonding is applied only to the portion where the heat pipe portion 15 is formed, and then the surface other than the portion where the paint is applied is pressed at a high temperature and a high pressure to be formed. . Since the portion where the paint is applied is not press-bonded, when high-pressure oil is injected from the pinch portion 17, the heat pipe portion 15 which is a swelling space portion is formed. At this time, the wick 20 is placed on the inner wall of the heat pipe section 15.
Is applied, the surface area of the entire inner wall is enlarged, and the capillary phenomenon is easily caused. After that, the oil is again drained from the pinch 17, but the cleaning liquid is injected from the pinch 17 to wash the oil attached to the inner wall of the heat pipe 15, and then the cleaning liquid is drained from the pinch 17 again. Next, the working fluid is injected into the cleaned heat pipe section 15, and after the injection, the pinch section 17 is closed by caulking or brazing. This enclosed working fluid is
The inner wall of the heat pipe section 15 on which the wick 20 has been provided is quickly moved by capillary action. This working fluid includes
For example, evaporative liquid such as ammonia is used.

The partition 13 according to the present embodiment is machined according to the shape of the low-temperature showcase 1 and is installed in the storage room 11 of the low-temperature showcase 1 as shown in FIG.

It should be noted that the partition plate 13 according to the present embodiment.
Can be applied to low-temperature showcases of any shape and size, and can be processed to an appropriate size according to the size of the low-temperature showcase and the like. further,
The intermediate partition plate 13 is not fixedly installed in the storage room 11 but can be freely moved according to the type and size of the storage material stored in the storage room 11.

Next, the operation of this embodiment will be described.

FIG. 6 shows an example in which the ice cream 30 is placed in the storage room 11 of the low-temperature showcase 1 in which the partition 13 is installed.
Indicates a state in which is inserted. Usually, ice cream placed in the bottom of the low-temperature showcase storage compartment is well cooled with little influence of heat from the outside of the showcase (for example, -25).
° C), the upper ice cream is not well cooled (eg, -18 ° C) due to heat from the glass and the influence of outside air entering by opening and closing the door. This is always likely to occur in a showcase with a cooling pipe on the wall of the storage room.If the storage room cool air is of a natural circulation type, the lower part will be cooled down further due to the difference in the density of the cool air, causing a temperature difference with the upper part. Easier to do.

When the partition plate 13 of the present embodiment is installed, heat is exchanged between the high-temperature side ice cream 30 and the low-temperature side ice cream 30 through the heat pipe section 15, and Temperature equalization is performed.

This is because of the influence of the temperature difference between the ice creams piled up and down adjacent to each other,
This is due to a temperature difference occurring in the heat pipe section 15 provided in the first section. When a temperature difference occurs in the heat pipe section 15, the working fluid is vaporized on the high temperature side and separates from the inner surface, and at this time, latent heat for evaporation is taken from the ice cream 30 on the high temperature side. The vaporized working fluid moves to a low-temperature portion, condenses on a surface having a low temperature, and gives heat to the cooled ice cream 30 to liquefy. The liquefied working fluid is the heat pipe 1
The effect of the streak-shaped groove wick 20 provided on the inner wall 5 causes the inner wall to reach the front surface again, and this cycle is repeated until the temperature difference disappears.

As described above, the compartment of the low-temperature showcase 1 is cooled by natural convection while utilizing the action of the heat pipe section 15 provided on the partition plate 13.

If the main cooler 47 is provided at the bottom of the chamber 11, the partition plate 1 is supported via the supports 19 and 21.
Since the heat exchange between the main cooler 3 and the main cooler 47 is promoted, the temperature of the storage room 11 is further equalized.

According to this embodiment, the partition 13
Due to the heat pipe effect, the temperature difference between the container near the wall of the storage room and the container away from the wall of the storage room can be reduced. It is possible to quickly equalize the resulting temperature difference of the warehouse product. Also, in the past, the uniformity of the room temperature was extremely slow because it was performed by heat conduction with the ice cream in contact with the room or by natural convection of the room air. It is possible to make the temperature uniform regardless of the temperature difference due to the difference in the vertical position of the stored goods, as well as the high, low, left and right positions. In addition, the temperature of the product added during use of the low-temperature showcase 1 can be more quickly made uniform with the temperature of the product stored before that.

Further, the partition plate 13 is not fixedly installed in the storage room 11 but is provided in the low-temperature showcase 1.
It can be freely moved and detached depending on the type, size, etc. of the storage items stored in the storage room 11 because it is unrelated to the refrigeration circuit of the above, and the user can arbitrarily set the partition position of the storage items. It is convenient to set.

[0028]

According to the present invention, it is possible to reduce the temperature difference between the storage object near the storage room wall and the storage object separated from the storage room wall. The temperature difference of the goods in the warehouse resulting from the difference in the density of the products can be quickly and uniformly made. Further, not only can the temperature difference coming from the upper and lower positions of the stored goods be quickly and uniformly, but also the temperature can be made uniform regardless of the position of the high temperature portion in any of the upper, lower, left and right positions. Further, the temperature of the product added during use of the low-temperature showcase can be more quickly made uniform with the temperature of the previously stored product. Further, the middle partition plate can be freely moved and detached according to the type, size, and the like of the storage room storage items stored in the storage room, and the user can arbitrarily set the partition position of the storage room storage items.

[Brief description of the drawings]

FIG. 1 is an external view showing one embodiment of a low-temperature showcase of the present invention.

FIG. 2 is a sectional view showing AA ″ of FIG. 1;

FIG. 3 is an external view showing a partition plate of a low-temperature showcase of the present invention.

FIG. 4 is a sectional view showing BB ″ in FIG. 3;

FIG. 5 is a cross-sectional view showing a space formed in a partition plate.

FIG. 6 is a diagram showing a state where commodities are stored adjacent to a partition plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low-temperature showcase 3 Insulated box 13 Middle partition plate 15 Heat pipe part 17 Pinch part 20 Wick 30 Product (ice cream) 39 Outer box 41 Inner box 45 Auxiliary cooler 47 Main cooler

Claims (3)

[Claims] 1. A low-temperature showcase having a partition plate in a storage room, wherein a heat pipe is attached to the partition plate. 2. The low-temperature showcase according to claim 1, wherein a wick is formed on an inner wall tube of the heat pipe. 3. The low-temperature showcase according to claim 1, wherein the storage room of the low-temperature showcase is cooled by natural convection.