JP2902754B2 - Cold storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a low-temperature refrigerator for performing indirect cooling.

2. Description of the Related Art Japanese Utility Model Application Laid-Open No. 60-93882 discloses a double box configuration of an outer heat insulating box and a heat conductive inner box. In this publication, a technology is disclosed in which an evaporator and a fan are placed in a cool air circulation space formed between the inner and outer boxes, and other refrigerator sets are provided outside the outer box. .

The problem to be solved by the invention is to dispose the inner box at an interval with respect to the heat-insulated outer box and to dispose an evaporator and a fan between the top walls of the inner and outer boxes. Moreover, although each cool air circulation space is continuous, the cool air circulation located in a part different from the circulation path formed by the fan [top wall → one side wall → bottom wall → other side wall → top wall] In the space (that is, the space corresponding to the outer portion of the remaining side wall), it is difficult for the cool air to be guided, and a uniform cool air flow cannot be formed in the entire cool air circulation space, and it is difficult to uniformly cool the entire inner box. There was a defect.

In order to solve this problem, the present invention proposes a support member for a bottom wall of an inner box of a low-temperature storage having a double insulation structure.

Means for Solving the Problems The present invention provides a heat-insulating outer box comprising a top wall, a bottom wall, and side walls;
A thermally conductive inner box in which a top wall, a bottom wall, and a side wall are arranged at intervals inside the outer box to form a storage room therein, and formed between the outer box and the inner box. A low-temperature storage, which cools an inner box and indirectly cools a storage room, comprising a cooling device disposed in a cool air circulation space, wherein the low-temperature storage is directly in contact with one of two opposing side walls of the inner box. And a hollow second angle that forms an air flow path that is perpendicular to the other set of side walls and that intersects and overlaps the first angle. Another object of the present invention is to provide a low-temperature refrigerator provided with a support member on which the bottom wall of the inner box is placed and which maintains a space between the bottom walls of the outer box and the inner box.

Action Since the first angle and the second angle intersect and overlap with each other, cold air flows having different traveling directions are created in the space below the bottom wall of the inner box. The cool air that has passed through this space joins in a space below the bottom wall of the inner box, so that the cool air blown out from the cooling device is uniformly dispersed in the cool air circulation space.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a low-temperature refrigerator such as a prefabricated refrigerator, and a heat-insulating outer box 2 having a box body formed by combining heat-insulating panels having a convex portion or a concave portion at a connecting portion with an adjacent panel; A sealed storage room 10 formed by arranging the inner box 3 [that is, the top wall 3A, the bottom wall 3B, and the front, rear, left and right side walls 3C to 3F] made of a heat conductor such as a metal at intervals, and A cool air circulation space 11 is formed around the storage room 10 (ie, a space surrounded by the inner box 3 and the outer box 2). It should be noted that the front wall of the heat-insulated outer box 2 has an article entrance 7 through which stored foods (agricultural products such as vegetables and fruits in this example) are put in and out, and the article entrance 7 is openably closed and the storage room 10 is closed.
Is provided with a heat insulating door 8 for closing the door.

On the top wall 3A constituting the cool air circulation space 11, a cooler 12 typified by an evaporator constituting a part of a refrigeration cycle, a blower fan and a blower fan motor, and a temperature sensor (not shown) And a first air blower 13 that is intermittently operated and stopped at the time of defrosting.
A drain device 15 such as a drain pipe with a heater is connected to the bottom of the cooling device 14 so as to be led out of the heat insulating outer box 2.

In this embodiment, the cooling device 14 is usually set at 0 ° C.
The temperature control width is small, and the ice temperature specification is used, where the temperature is controlled with extremely high control accuracy (for example, control accuracy of ± 0.5 ° C. of set temperature). Ice temperature refers to the temperature range between 0 ° C when water freezes and the temperature immediately before food freezes, and is intended for long-term storage while avoiding changes in physical properties (cell destruction, etc.) due to freezing of food. It can be said that the temperature. Also, the intermittent operation stops when the temperature detected by the temperature sensor falls below the lower limit temperature,
This means an operation control in which an operation state is set when the temperature becomes equal to or higher than the upper limit temperature. In the present embodiment, an example of control using a temperature sensor is shown. However, intermittent operation control means such as a timer may be employed.

16 and 17, one end is connected to the cooling device 14 and the other
To the cooling device 1
4, a front and rear partition plate for partitioning into a high-pressure section 20 and a low-pressure section 21 in cooperation with 4, and in particular, a front partition plate 16 is disposed upstream of the article entrance 7 in the cool air circulation direction.

Reference numerals 18 and 19 denote second blowers which are disposed so as to be located on the leeward side of the first blower 13 and are always operated.

The cool air circulation space 11 is located in the upper space 11A above the top wall 3A.
A bottom space 11B below the bottom wall 3B, a front space 11C outside the front wall 3C, a rear space 11D outside the rear wall 3D, and a left wall.
3E left space 11E outside and right wall 3F right space 1 outside 3F
1F, and in this example, the cooling device 14 is disposed in the upper space 11A.

On the other hand, while attaching the inner box 3 to the outer box 2 at a predetermined interval, the cool air blown out from the cooling device 14 is
In order to circulate the cooling air uniformly in the cooling air circulation space 11, a plurality of metal columns 30 are used. The plurality of struts 30 form a space 11C formed by the inner box front side wall 3C and the outer box 2 into a front high-pressure area 31 and a low-pressure area 21 that communicate with the high-pressure area 20 around the left and right sides of the heat insulating door 8. Communicating front low pressure area 32
The space 11D formed by the first column 30A that vertically partitions the space and the inner box rear side wall 3D and the outer box 2 is connected to the rear high pressure area 33 and the low pressure area 21 that communicate with the high pressure area 20. Low pressure area
34 and a second support column 30B which vertically partitions.

Reference numeral 40 denotes a support member for holding a space between the bottom walls 2B and 3B of the outer box 2 and the inner box 3 and for mounting the bottom wall 3B of the inner box. A plurality of hollow first angles disposed at intervals so as to form an air flow path that is orthogonal to one set of side walls (3C and 3D in this embodiment) of the two sets of opposed side walls. A first angle 41 is provided at a distance from the other side wall (3E and 3F in this embodiment) so as to form an air flow path orthogonal to the other side wall (3E and 3F).
And a plurality of hollow second angles 42 overlapping and intersecting with each other.

In the above configuration, cooling of the low-temperature storage 1 will be described.

First, assuming that the non-cooled storage room 10 is filled with agricultural products such as foods such as vegetables and fruits, and the set temperature is set in an ice temperature range (for example, 0 ° C.) and the cooling device 14 is operated.
Since the inside of the storage room 10 is higher than the set temperature,
The air (cold air) cooled by the cooling device 14 passes through the first and second blowers 13, 18, and 19 from the high-pressure section 20 of the upper space 11A through the front and rear right spaces 11C, 11D, and 11F, and reaches the bottom portion. Guided to space 11B, passing through left space 11E and upper space 11A
Is returned to the cooling device 14 through a path returning to the low-pressure area 21.

At this time, the upper and lower front and rear left and right walls 3A to 3F are cooled by cold air, and the inside of the storage room 10 is indirectly cooled by radiant heat from each wall. However, the cooling operation of the cooling device 14 is stopped when the thermocycle is turned off or defrosted, or the cooling load is increased due to the inflow of outside air or disturbance caused by the opening and closing operation of the heat insulating door 8.
When the temperature in the storage room rises and exceeds a predetermined temperature that is a fixed temperature higher than the set temperature (that is, a cooling operation return temperature), the above-described cooling operation is repeated to maintain the temperature in the storage room at the set temperature. Is what you do.

Then, when the temperature in the storage room 10 gradually decreases to a temperature lower than the set temperature (specifically, a temperature lower than the set temperature by a certain temperature or lower), the cooling device 14 is switched to a thermocycle-off operation, and the storage room temperature is lowered. Is maintained at 0 ° C. During this thermocycle-off operation, the first blower 13 stops, but the second blower 1
8 and 19 are operated at all times, so that a local circulating cold air flow is formed at least along the periphery of the article entrance 7 and acts as a circulator for promoting heat exchange with the inner box 3. Above all, the inner box is continuously cooled, and a rapid rise in the temperature of the storage room 10 can be suppressed.

[Effects of the Invention] As described in detail above, according to the present invention, a first angle forming an air flow path orthogonal to one set of side walls and an air flow path orthogonal to another set of side walls are formed. With the second angle crossing the first angle and overlapping, the cool air flows having different traveling directions can be merged below the inner box bottom wall, so that the conventional problem can be solved and formed by the blower. The cool air is guided not only to the cool air circulation path but also to the space outside the remaining side wall, so that a uniform cool air flow can be formed in the entire cool air circulation space and the entire inner box can be uniformly cooled.

[Brief description of the drawings]

Each drawing shows an embodiment of the low-temperature refrigerator of the present invention, FIG. 1 is a schematic perspective view showing the flow of cold air in a state where the support member is incorporated, FIGS. 2 and 3 are longitudinal sectional views of the low-temperature refrigerator and FIG. FIG. 4 is a longitudinal sectional view of a main part showing fixing of each wall of the inner box in a space above the top wall of the inner box. 1 ... low-temperature box, 2 ... heat-insulated outer box, 3 ... heat-conductive inner box,
2A, 3A top wall, 2B, 3B bottom wall, 2C-2F, 3C-3F side wall, 11 cool air circulation space, 14 cooling device, 40 support member, 41st One angle, 42 ... the second angle.

Claims (1)

(57) [Claims] An insulating outer box comprising a top wall, a bottom wall, and side walls;
A thermally conductive inner box in which a top wall, a bottom wall and side walls are arranged at intervals inside the outer box to form a storage room therein; and a heat conductive inner box formed between the outer box and the inner box. A cooling device disposed in a cool air circulation space, which cools the inner box and indirectly cools the storage room.
A first angle forming an air flow path orthogonal to one set of side walls of the pair of side walls, and a second angle forming an air flow path orthogonal to the other set of side walls and intersecting and overlapping the first angle. A low-temperature storage having a support member for holding a space between the bottom walls of the outer box and the inner box and mounting the bottom wall of the inner box.