JPH05248758A - Low temperature chamber - Google Patents

Abstract

PURPOSE:To maintain the quality of stored articles for a long period by providing a duct extending from an opening formed in a heat insulating box to the interior of a storage chamber. CONSTITUTION:A duct 6 extending from an opening 4 formed in a front wall 2C of a heat insulating box to the interior of a storage chamber is installed. When a heat insulating door is opened to carry in or out a stored article, the open air enters the duct 6 and the increase the temperature of the duct 6. However, the increase of temperature in the storage chamber is suppressed by the vicinity of an opening 6A of the duct 6 and the range of temperature rise can be decreased. This constitution prevents the increase of the temperature of the whole of stored articles and keeps quality of the stored articles for a long period.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a low temperature refrigerator such as a prefabricated refrigerator.

[0002]

2. Description of the Related Art For example, Japanese Unexamined Patent Publication No. 3-105186 discloses a low-temperature chamber in which a storage chamber is formed inside a heat insulating box and a cooling device is provided to cool the storage chamber. An opening is formed on the front wall of the heat insulating box of the low-temperature storage for putting in and taking out stored products, and an insulating door is provided to openably and closably close the opening and seal the storage chamber.

[0003]

In the above-mentioned prior art, when the low temperature storage is, for example, a prefabricated large-scale refrigerated storage, an automatic or semi-automatic rack and steel rack are provided in the storage. The storage is stored by these. Here, the greater the temperature difference between the inside and outside of the cold storage, the greater the cooling load inside the storage due to the outside air entering at the time of opening and closing the heat insulation door accompanying the loading or unloading of stored items, and the warm air. Since the temperature rises to the upper part of the storage chamber, the temperature rise at the upper part of the storage chamber is always large near the opening. FIG. 6 is a thermograph showing this state. The outside air temperature is, for example, 30 ° C., and the inside temperature is, for example, about −30.
In the case of ℃, if the heat insulation door is opened for 10 seconds, the temperature of the storage room rises by 40 ℃ or more in a severe temperature. For this reason, the stored goods stored especially in the upper part near the opening are exposed to warm air for a long time, which adversely affects the stored goods such as foods such that the storage period is shortened.

An object of the present invention is to limit the temperature rise range in the storage chamber when carrying in and out stored products.

[0005]

In order to solve the above problems, the present invention is capable of opening and closing a heat insulating box 2 having a storage chamber 3 therein and an opening 4 formed in a front wall 2C of the heat insulating box 2. In a low-temperature warehouse provided with a heat-insulating door 5 closed to the inside, a low-temperature warehouse provided with a heat-insulating duct 6 extending from the opening 4 into the storage room 3 is provided to raise the temperature in the storage room when carrying in stored products. Is to suppress.

A duct 6B extending from the opening 4 into the storage chamber 3 and a heat-insulating duct 6 extending from the opening 4 to the outside of the refrigerator.
A low-temperature storage provided with C and a heat insulating door 5 provided in the opening 10 on the outside of the storage chamber 3 of the duct 6C is provided to suppress a temperature rise in the storage chamber when a stored product is brought in. Further, by providing a low-temperature storage provided with a heat-insulating duct 6D extending from the opening 4 to the outside of the storage chamber 3 and a heat-insulating door 5 provided in the opening 11 of the duct 6D, for example, when carrying in stored goods It suppresses the temperature rise in the storage room.

[0007]

When the heat insulating door 5 is opened to carry in or carry out stored goods, the outside air enters the duct 6 and the temperature in the duct 6 rises, but the temperature in the storage chamber 3 rises. The temperature rise range can be narrowed, the storage period can be extended regardless of the storage location of the stored product, and the cooling load can be reduced.

By dividing the duct into the duct 6B on the storage chamber 3 side and the heat insulating duct 6C on the outside of the refrigerator,
The size of the duct on the side of the storage chamber 3 can be shortened while maintaining the effect of the duct, the storage space of the storage chamber 3 can be increased, and the storage capacity of the cold storage can be improved. Further, when only the duct 6D on the outside of the storage is used as the duct, the projection of the duct 6D into the storage chamber 3 is eliminated, and it becomes possible to further increase the storage space in the storage chamber and further improve the storage capacity. Further, it becomes possible to increase the working space in the storage room.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 is a large-scale low-temperature refrigerator such as a prefabricated refrigerator, in which a sealed storage chamber 3 is formed in a heat insulating box 2, and the heat insulating box 2 has a convex portion or a convex portion at a joint portion with an adjacent panel. A plurality of heat insulating panels having recesses are combined to form a box shape, and the heat insulating box 2 is formed of side walls such as a ceiling panel 2A, a bottom wall 2B, and a front wall 2C.

The front wall 2C has an opening 4 for putting in and taking out articles for putting in and out stored articles (frozen food such as fish or meat in this example).
Are formed. The opening 4 is provided with a heat insulating door 5 that closes the opening 4 so that the opening 4 can be opened and closed, and the storage chamber 3 is sealed. Reference numeral 6 denotes a duct of size L1 connected to the peripheral portion of the opening 4 on the storage chamber 3 side. The duct 6 is formed, for example, by combining a plurality of wooden plates, has a dimension L1 of, for example, about 1 m, and extends from the peripheral portion of the opening 4 into the storage chamber 3. Here, in addition to a wooden plate as the plate forming the duct 6, for example, a plastic plate or a foamed heat insulating panel forming a heat insulating box of a prefabricated refrigerator may be used. Reference numeral 7 is a rail laid inside the storage room 3 from outside the refrigerator.
A truck 7A is mounted on the rule 7. Then, the stored goods placed on the dolly 7A are carried into the storage chamber 3 automatically or manually, for example. When carrying out the stored product, the stored product is placed on the carriage 7A and carried out from the storage chamber 3.

Further, a cooling device 8 having a cooling device represented by an evaporator forming a part of a refrigeration cycle and a blower is attached to the ceiling wall 2A. Also,
The storage chamber 3 is provided with a temperature detector (not shown) for detecting the temperature in the storage chamber 3, and the cooling device 8 is intermittently operated based on the temperature detected by the temperature detector. This intermittent operation means that the cooling device 8 is stopped when the temperature detected by the temperature detector becomes lower than or equal to the lower limit temperature determined by the set temperature ST in the storage chamber 3, and the operating state when the temperature becomes higher than or equal to the upper limit temperature. It means the operation control that becomes.

The cooling operation of the cold storage 1 having the above structure will be described. First, when a frozen food such as meat is stored in the storage room 3 in the cooled state, the set temperature ST in the storage room 3 is set to −30 ° C., and the power is turned on to operate the cooling device 8. Since the temperature inside the storage chamber 3 is higher than the set temperature, the cooling device 8 is operated by the control device (not shown) based on the output of the temperature sensor. Then, the cooling device 8 is stopped when the temperature in the storage chamber 3 reaches, for example, −33 ° C., and is operated at the time when it reaches −31 ° C.

The carrying-out and carrying-in of stored products into the low temperature refrigerator 1 configured as described above will be described below. When carrying in a stored product, the stored product is placed on the carriage 7A and the heat insulating door 5 is opened. Next, the carriage 7A is moved into the storage chamber 3 through the opening 4 and the duct 6 automatically or manually, for example. Then, the stored goods are unloaded from the cart and the cart is moved to the outside of the refrigerator. Further, when there are a plurality of stored items to be carried in, the above work is repeated. During this carrying-in operation, outside air enters the storage chamber 3 through the duct 6 while the heat insulating door 5 is open, but because of the duct 6, the outside air (warm air) directly enters the storage chamber 3. There is no intrusion.
FIG. 5 shows a temperature distribution in the storage chamber 3 when the temperature inside the storage chamber 3 is, for example, −30 ° C. and the temperature outside the storage is 30 ° C. and the heat insulating door 5 is opened for, for example, 10 seconds. It is a thing. As is clear from FIG. 5, the temperature in the vicinity of the upper portion of the opening 6A on the storage chamber 3 side of the duct 6 has risen to −10 ° C., but the entire temperature including the upper portion in the storage 3 falls below −20 ° C. The temperature rise range is narrowed.

On the other hand, when carrying out the stored goods, the stored goods are placed on the carriage in the storage room 3 or the carriage 7A moved into the storage room 3. Then, the heat insulation door 5 is opened, the truck 7A is automatically or manually moved through the duct 6 and the opening 4 to the outside of the refrigerator, and the stored goods are unloaded from the truck 7A. When there are a plurality of stored items, the carriage 7A is moved into the storage chamber 3 and the stored items are similarly carried out. At the time of this carry-out work, as in the case of carry-in work, since there is the duct 6, the outside air is directly exposed
It does not invade inside, and the range of temperature rise is narrowed.

As described above, since the duct 6 is formed from the opening 4 in the storage chamber 3, even when the heat insulating door 5 is opened to carry in or carry out the stored goods, the outside air is kept inside the duct 6. It flows into the storage chamber 3 while being mixed with cold air, the temperature rise in the storage chamber 3 is suppressed near the upper part of the opening 6A of the duct 6, and the temperature rise range can be narrowed. It is possible to avoid the temperature rise of the upper stored products, maintain the quality of the entire stored products in the storage chamber 3 uniformly for a long time, and reduce the cooling load.

Further, when, for example, an air-curtain is formed in the opening of the duct 6 on the storage chamber 3 side, the air in the duct 6 and the cool air in the storage chamber 3 can be cut off, and the storage chamber The range of temperature rise within 3 can be further narrowed.
Further, FIG. 3 shows a low temperature warehouse in which ducts are provided on the storage chamber 3 side of the opening 4 and on the outside of the refrigerator, and the same components as those of the low temperature warehouse shown in FIG. , Its detailed description is omitted. In the cold storage shown in FIG. 3, a duct 6B is provided on the storage chamber 3 side of the opening 4 and is constituted by combining a plurality of wooden boards, for example. Further, a duct 6C is provided on the outer side of the opening 4 and the duct 6C is required to ensure the heat insulating performance, and therefore, for example, it is configured by combining a plurality of foam heat insulating panels. And duct 6
The combined dimension of the dimension L2 of B and the dimension L3 of the duct 6C on the outside of the refrigerator is substantially equal to the dimension L1 of the duct 6 shown in FIG. Then, the heat insulating door 5 is provided in the opening 10 on the outside of the duct 6C.
Is openable and closable.

Also in the above-mentioned low temperature warehouse, when the heat insulating door 5 is opened and the opening 10 is opened at the time of loading and unloading the stored items, outside air is mixed with cold air in the respective ducts 6B and 6C. It flows into the storage room 3. Therefore, similarly to the low-temperature storage shown in FIG. 1, the temperature increase in the storage 3 can be suppressed near the upper part of the opening 11 of the duct 6B, and the temperature increase range can be narrowed. As a result, the entire storage chamber 3 can be obtained. The quality of the stored goods can be maintained uniformly over a long period of time. Further, the dimension L2 of the duct 6B on the storage room 3 side can be shortened, the storage space of the storage room 3 can be increased, and the storage capacity of the stored product can be increased.

Further, FIG. 4 shows a low temperature warehouse in which a duct is provided only outside the opening 4 and the same components as those of the low temperature warehouse shown in FIG. 1 are designated by the same reference numerals, Detailed description thereof will be omitted. In the low temperature warehouse of FIG. 4, the duct 6D on the outside of the refrigerator is configured by combining, for example, a plurality of foam insulation panels in order to ensure the heat insulating performance in the same manner as the duct 6C on the outside of the refrigerator shown in FIG. L4 is substantially equal to the dimension L1 of the duct 6 shown in FIG. The heat insulating door 5 is provided in the opening 12 on the outside of the duct 6D so as to be openable and closable.

Also in the above-mentioned low temperature chamber, when the heat insulating door 5 is opened and the opening 12 is opened at the time of loading and unloading the stored items, the outside air is mixed with the cool air in the duct 6D and the storage chamber 3
Flows in. Therefore, similarly to the low-temperature storage shown in FIG. 1, the temperature increase in the storage 3 can be suppressed near the upper part of the opening 4 and the range of the temperature increase can be narrowed. The quality can be maintained uniformly over a long period of time. Further, the duct in the storage room 3 can be eliminated, the storage space of the storage room 3 can be significantly increased, and the storage capacity of the stored product can be increased. Further, the work space in the storage chamber 3 can be increased, and the loading / unloading work can be facilitated.

The present invention is not limited to the above embodiment, and the size of each duct is appropriately changed depending on the size of the low temperature chamber and the area of the opening 4.

[0021]

The present invention is a cold storage constructed as described above, and since it has a duct extending from the opening formed in the heat insulation box into the storage chamber, it can be used for carrying in or carrying out stored products. When the adiabatic door is opened, the temperature rise due to outside air is substantially suppressed inside the duct, and in particular the temperature rise in the upper part of the duct near the opening on the storage chamber side can be suppressed, and the temperature rise range in the storage chamber is narrowed. As a result, the temperature rise of the entire stored product can be avoided and the quality of the stored product can be maintained for a long period of time.

Further, a duct extending from the opening formed in the heat insulating box to the storage chamber is provided, a heat insulating duct extending from the opening to the outside of the storage chamber is provided, and a heat insulating door is provided at the opening of the heat insulating duct. As a result, the temperature rise due to outside air is suppressed in the duct and in the vicinity of the duct even when the heat insulation door is opened, and the range of temperature rise in the storage room can be narrowed. It is possible to maintain the quality of stored goods for a long period of time, further reduce the size of the duct in the storage chamber, secure a storage space for the stored goods, and improve the storage capacity.

Further, by providing a heat-insulating duct extending from the opening formed in the heat-insulating door to the outside of the refrigerator, and by providing the heat-insulating door in the opening of this duct, the temperature rise in the storage chamber when the heat-insulating door is opened can be prevented. The range can be narrowed and the temperature rise in the storage chamber during storage can be suppressed slightly by the insulating duct, and as a result, the quality of the stored goods can be maintained for a long time, Since the duct is not provided, the storage space for stored items can be significantly increased, and the storage capacity can be greatly improved.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an opening of a cold storage.

FIG. 2 is a perspective view of a cold storage.

FIG. 3 is a schematic perspective view of an opening portion of a low temperature refrigerator showing another embodiment of the present invention.

FIG. 4 is a schematic perspective view of an opening portion of a low temperature refrigerator showing another embodiment of the present invention.

5 is a thermograph showing the temperature rise in the storage compartment of the cold storage shown in FIG. 1. FIG.

FIG. 6 is a thermograph showing a temperature rise in a storage room of a conventional low-temperature storage.

[Explanation of symbols]

 1 Low Temperature Cabinet 2 Insulation Box 2C Front Wall 3 Storage Room 4 Opening 5 Insulation Door 6 Duct 6A Opening

Claims (3)

[Claims] 1. A low-temperature refrigerator equipped with a heat-insulating box that forms a storage chamber therein, and a heat-insulating door that opens and closes an opening formed in a side wall of the heat-insulating box, the duct extending from the opening into the storage chamber. It is equipped with a low temperature refrigerator. 2. A low-temperature warehouse equipped with a heat-insulating box that forms a storage chamber inside and a heat-insulating door that opens and closes an opening formed in a side wall of the heat-insulating box, and a duct extending from the opening into the storage chamber. And a heat insulating duct extending from the opening to the outside of the storage room, and a heat insulating door provided at the opening of the heat insulating duct. 3. A low-temperature storage comprising a heat-insulating box having a storage chamber formed therein and an opening formed in a side wall of the heat-insulating box, the heat-insulating duct extending from the opening to the outside of the storage chamber, and the duct of the duct. A low-temperature warehouse characterized by having an insulating door provided at an opening.