JPH0743200B2 - Cold storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a low temperature chamber for cooling while keeping a humidity of a storage chamber constant.

2. Description of the Related Art A conventional refrigerator box consists of a heat-insulating outer box and a heat-conducting inner box 2
As a low-temperature warehouse having a heavy structure and a cooling device provided between the inner and outer boxes to cool the inner box and the inside thereof.
There is a 60-152875 publication. In this publication, a cool box main body, a closed cool room provided inside the main body through a blocking wall made of a good heat conductor to be isolated from the surrounding cold air circulation space, and a cold air generation device provided in the cold air circulation space. Disclosed is that the cold storage chamber is provided with an openable / closable inlet / outlet opening to the outside of the cold storage main body that is cut off from the cold air circulation space, and an openable / closable cold air inlet / cool air outlet opening in the cold air circulation space. is there.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-described technique, outside air enters the cold insulation chamber by opening and closing a sealing lid provided at an entrance communicating with the cold insulation chamber. For this reason, the moisture contained in the outside air that has entered the cold storage chamber when the air outlet and the suction port are opened will be sequentially taken into the cold air circulation space as the air is circulated by the air blower, and the evaporator will be frozen. Becomes attached. Therefore, a defrosting device and a drain pipe are required, but this drain pipe is connected and arranged at the bottom of the cooling device, and if the portion of this drain pipe is arranged in the cold air circulation space, it becomes the cooling device. As the height of the cold air circulation space for accommodating this cooling device is also increased, the height of the low temperature chamber is increased, and the low temperature chamber becomes large, or the height of the cold storage chamber is decreased. There is a problem that the effective volume of the storage room is reduced. Moreover, since the inside of the cold air circulation space is maintained at a freezing temperature that is lower than the temperature of the cold storage chamber,
The wastewater that is stored in or is about to pass through the drainage pipe is cooled and freezes in the drainage pipe, blocking the drainage passage,
There was a problem that the original purpose of the drainage pipe could not be effectively drained, and it was necessary to provide the drainage pipe with a heating device such as a heater having a selected heating amount.

Then, this invention makes it the subject to eliminate the above-mentioned malfunction by improving the cooling device arrange | positioned in a cold air circulation space.

[Means for Solving the Problems] The present invention provides a heat-insulating outer box, a ceiling wall / bottom wall and a pair of opposing side walls which are made of a good heat conductor and are spaced apart from each other inside the heat-insulating outer box. (EN) A low-temperature storage provided with a storage chamber formed by an installation, and a cooling device provided in a space formed by an outer box and a ceiling wall and having a cooler and a blower. A drainage pipe is provided at the bottom of the device so as to pass through the ceiling wall and pass through the storage chamber to be led out to the outside of the outer box.

Action Since the drainage pipe penetrates the ceiling wall and is led out to the outside of the outer box through the storage chamber, it acts so as to eliminate the portion protruding from the bottom of the cooling device and flatten the bottom of the cooling device. In addition to being mountable on the surface, it acts so as to suppress the required height of the portion for accommodating the cooling device, that is, the cool air circulation space, so that the distance between the top wall and the outer box becomes small. Also, since the drainage pipe is located in the storage room where the temperature is higher than the temperature in the cold air circulation space, the cooling device is managed in a temperature range of 0 ° C or higher (negative temperature range for cryopreservation). Controlled by the temperature range between the freezing point of water and the temperature just before freezing of food (this is called ice temperature). When used as a product that is narrowly controlled with extremely high control accuracy (called ice temperature specification), the drainage pipe itself is exposed to the cold air of the freezing temperature below 0 ° C (usually -5 ° C or less). It prevents the freezing of the drainage water in the drainage pipe.

Embodiments Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

Reference numeral 1 denotes a low-temperature refrigerator such as a prefabricated refrigerator, which is a heat-insulating outer box 2 in which a heat-insulating panel is combined to form a box, and the outer box 2
Top wall 3 made of a good thermal conductor such as metal with a space inside
A storage chamber 10 formed by arranging the bottom wall 4 and a pair of left and right side walls 5 and 6 facing each other, and a cold air circulation space 11 that surrounds the storage chamber 10 vertically and horizontally (that is, storage) The front and rear surfaces of chamber 10 are not covered by ducts as a space for cold air circulation). The front wall of the heat-insulating outer box 2 is provided with an opening 7 for putting in and taking out stored goods and a heat-insulating door 8 for closing the opening 7 so as to be openable and closable.

On the ceiling wall 3 that constitutes the cold air circulation space 11, a cooler represented by an evaporator that constitutes a part of the refrigeration cycle.
12 and a blower device 13 including a blower fan and a fan motor
And a cooling device 14 inside the refrigerator having
At the bottom of 14 (generally, a dew tray for receiving the dew generated during defrosting of the cooler 12 is provided at this bottom), the ceiling wall 3 is penetrated and the storage chamber 10 is passed through to the outside of the heat insulating outer box 2. A drainage device 15 such as a water pipe with a heater is connected so as to be led out. In the present embodiment as the cooling device 14, the control temperature range is fine and extremely high in the temperature zone between the freezing point of ice of 0 ° C. and the temperature of the food immediately before freezing (hereinafter referred to as ice temperature). The one managed by control accuracy (called ice temperature specification) is used.

The cold air circulation space 11 is an upper space 11A as a first space above the ceiling wall 3, a cold air supply space 11B as a second space outside the right side wall 6, and a lower space as a third space below the bottom wall 4. It is composed of a space 11C and a cool air recovery space 11D as a fourth space on the outer side of the left side wall 5, and in this example, the cooling device 14
Is arranged in the upper space 11A.

Reference numeral 20 denotes a humidifying device which is provided on the front wall of the heat insulating outer box 2 to humidify the storage chamber 10.

Reference numeral 30 designates the cold air supply space 11B in the cold air circulation space 11 inside and outside 2
A partition plate that partitions the passage into three passages (each of which is referred to as an inner passage 31 and an outer passage 32) and closes the lower end of the inner passage 31, and the inner and outer passages 31, 32 are provided on the upper end side of the partition plate 30.
A flow path switching device 33 for selectively introducing the cool air to either one or both of them is provided, and the cool air supply space 11B is provided.
The flow of cold air inside can be switched.

The flow path switching device 33 includes a flow path switching member 35 that opens and closes the inner and outer passages 31 and 32, a drive device 36, a cam 37 that is decelerated by the drive device 36, and one end of which is rotated by the flow path switching member 35. And an operating plate (38) that is freely pivotally supported and the other end is pivotally supported by a cam (37) and is made of a leaf spring material having flexibility.

On the other hand, a large number of holes 51 are formed in the left and right side walls 5 and 6, respectively. Further, by forming a large number of holes 52 on the upstream side of the flow path switching device 33 in the right side wall 6, the storage chamber 10 is always maintained.
A small amount of cold air flows in to form cold air convection in the storage chamber 10.

The cooling of the cold storage 1 in the above configuration will be described.

First, assuming that the storage chamber 10 is filled with a substance to be cooled, for example, fresh food such as fresh fish, (1) since the temperature inside the storage chamber is higher than a desired temperature, the inside of the storage chamber 10 is cooled. The drive device 36 is operated by a control device (not shown), and the cool air supply space formed by the flow path switching device 33 is formed.
The cold air passage of 11B is switched to the storage chamber side, that is, the position where the outer passage 32 is closed and the inner passage 31 is opened. Therefore, the air cooled by the cooling device 14 (this is called cold air) enters the inner passage 31 from the upper space 11A, is guided into the storage chamber 10 through the hole 51 of the right side wall 6, and is passed through the hole of the left side wall 5. Cold air collection space
The first cold air circulation path P (see the solid line arrow in FIG. 2) returning from 11D to the air suction side of the cooling device 14 is taken. This route P
The temperature in the storage chamber is gradually lowered by the cooling by the cooling method described above (since the cool air directly passes through the storage chamber to cool it).

(2) When the temperature in the storage chamber gradually decreases to a predetermined temperature or less due to the direct cooling by the first cool air circulation path P, the drive device 36 is operated by the control device to switch the flow path. The device 33 is connected to the non-storage room side, that is, the outside passage
Is opened and the inner passage 31 is switched to a closed position.
Therefore, the cool air exiting the cooling device 14 enters the outer passage 32 from the upper space 11A, returns to the air suction side of the cooling device 14 through the lower space 11C and the cool air recovery space 11D, and is returned to the second cool air circulation path Q (see FIG. 1). Take the broken arrow). By the cold air circulation by the second cold air circulation path Q, the ceiling wall 3, the partition plate 30, the bottom wall 4 and the left side wall 5 are respectively cooled, so that the inside of the storage chamber 10 is indirectly cooled (hereinafter referred to as indirect cooling). ).

(3) When the temperature inside the storage chamber gradually decreases due to the indirect cooling by the cool air circulation path Q and falls below the desired temperature set by the setting means (not shown), the cooling device 14 performs the thermocycle operation. Alternatively, the operation is switched to the minimum capacity operation or the like to maintain the temperature of the storage chamber at a desired temperature.

When the temperature inside the storage chamber exceeds a predetermined temperature due to a temperature rise due to the opening / closing operation of the door 8 or a temperature rise due to disturbance, etc., the cooling process in the storage chamber is repeated by repeating the above-described cooling steps (1) to (3). The temperature is maintained at a desired temperature.

According to the above configuration, the drainage device 15 connected to the refrigerating device 14 is guided through the ceiling wall 3 into the storage chamber 10 and then led out to the outside of the heat insulating outer box 2. If the refrigerator 14 is used for refrigeration (the temperature is controlled in a temperature range not generally intended for freezing (generally referred to as refrigeration temperature) and usually includes ice temperature) The drainage device 15 is not exposed to a negative temperature, the drainage water that passes through the drainage device 15 or is stored in the drainage device 15 is not frozen, and the drainage passage in the drainage device 15 is not blocked. be able to. And the heater of the drainage device can be removed.

Further, since the drainage device 15 penetrates the ceiling wall 3 and is led out to the outside of the outer box 2 via the storage chamber 10, it acts so as to eliminate the portion protruding from the bottom of the cooling device 14, and the cooling device 14
The bottom of the can be placed on a flat surface, and also acts to suppress the required height of the portion for housing the cooling device, that is, the cold air circulation space, so that the space between the ceiling wall 3 and the outer case 2 is reduced. It can be made small and does not reduce the height of the storage chamber as in the past.

[Effects of the Invention] As described in detail above, according to the present invention, after the drainage device connected to the refrigeration system is introduced into the storage chamber through the ceiling wall,
Since it is led out to the outside of the heat-insulating outer box, if the refrigeration system is used for refrigeration, the drainage system will not be exposed to negative temperatures, and the drainage that passes through or is stored in the drainage system will not be exposed. It is possible to prevent freezing, and to prevent the drainage passage in the drainage device from being blocked. Further, since the drainage device penetrates the ceiling wall and is led out to the outside of the outer box through the storage chamber, it acts so as to eliminate the portion protruding from the bottom of the cooling device, and the bottom of the cooling device is flat. It is possible to place the cooling device on the top, and it is possible to suppress the required height of the portion that houses the cooling device, and to suppress the distance between the ceiling wall and the heat insulating outer box.

[Brief description of drawings]

Each drawing shows one embodiment of the present invention, FIG. 1 is a front view of a low temperature compartment in a partially cutaway state showing a cold air circulation path during indirect cooling, and FIG. 2 is a cold air circulation path during direct cooling. Figure 1 correspondence diagram,
FIG. 3 is a plan view of the low temperature cabinet with the top plate of the heat insulation outer box removed.
FIG. 4 is an enlarged view of part A in FIG. 1, and FIG. 5 is an enlarged view of part B in FIG. 1 ... Low temperature chamber, 2 ... Insulated outer box, 3 ... Top wall, 4 ... Bottom wall, 5,6 ... Side wall, 10 ... Storage room, 11 ... Cold air circulation space, 12 ... Cooler , 13 …… Blower, 14 …… Cooler,
15 ... Drainage device, 30 ... Partition plate.

Claims (1)

[Claims] 1. A heat-insulating outer box, a storage chamber formed by arranging a ceiling wall / bottom wall and a pair of opposing side walls, which are made of a good heat conductor, and are spaced apart from each other inside the outer box. Provided is a cooling device having a cooler and a blower arranged in a space formed by an outer box and a ceiling wall, and the outside of the outer box passing through the ceiling wall at the bottom of the cooling device and passing through the storage chamber. A low-temperature warehouse characterized by being provided with a drainage device that is led out to.