JP2606738B2 - Cold storage - Google Patents

Description

The present invention relates to a storage constructed underground, which uses heat pipes to remove heat from the soil around the storage to cool the storage,
Regarding a low-temperature storage that keeps the inside of the warehouse at low temperature, in particular, watering the soil around the warehouse to keep the temperature and humidity in the warehouse within a predetermined range, to prevent overcooling and overdrying in the warehouse, Further, the present invention relates to a low-temperature storage that can store a large amount of surplus cold heat and that serves as a replenishing source when cold heat is insufficient.

2. Description of the Related Art A low-temperature storage method that cools the periphery of a storage building constructed underground using a heat pipe is based on an underground frozen soil formation method that has been developed and researched as one of ground improvement techniques in the civil engineering field. By placing each evaporator of a number of heat pipes in the soil around the storage building built underground, and exposing the condensing part of these heat pipes to the low-temperature atmosphere, heat from the ground is removed by the heat pipe. It is pumped to the ground and released into the atmosphere to freeze or cool the soil around the storage to keep the inside of the storage at a low temperature. It has come to be.

As a conventional underground cold storage constructed using a heat pipe, there is Japanese Utility Model Application No. 61-1942 filed by the present applicant.
No. 38 and Japanese Utility Model Application No. 63-129963. For example, FIG. 2 schematically shows a conventional general heat pipe type low temperature storage, and the low temperature storage 1 is a low temperature storage for storing vegetables, and is formed as a space below the ground surface GL. wall,
The soil 2 around the floor and ceiling is separated from the outside by a water shielding / heat insulating layer 3.

A large number of heat pipes 4 are buried in the surrounding soil 2 which is the wall of the low-temperature storage 1 inside the water-blocking / insulation layer 3, on the side of the respective evaporating sections 4 a. The condensing portion 4b extends from the surface GL into the low-temperature atmosphere, and a large number of radiating fins 4c are formed on the outer periphery of each condensing portion 4b. In addition, a water sprinkling pipe 5 is provided at an upper portion inside the water impermeable and heat insulating layer 3.

Then, in the low-temperature storage 1, the heat in the surrounding soil 2 is taken by the respective heat pipes 4, carried to the condensing portion 4 b exposed from the ground surface, and released from the condensing portion 4 b to the atmosphere. Therefore, when the ambient temperature is below freezing, the soil 2 around the low-temperature storage 1 is cooled and the moisture contained in the soil is frozen to form frozen soil, and the inside of the low-temperature storage 1 is also cooled to near 0 ° C. The temperature inside the refrigerator is kept at 0 to 5 ° C., which is an appropriate temperature for storing vegetables.

Problems to be Solved by the Invention However, in the above-mentioned conventional low-temperature storage, under climatic conditions such as abnormal low temperature, the heat transfer capacity of the heat pipe becomes too high, and all the moisture in the surrounding soil is frozen. If this happens, the temperature in the refrigerator drops to 0 ° C. or less, causing a problem that vegetables are frozen. Conventionally, water is supplied to the soil 2 around the storage 1 from the watering pipe 5 or the low temperature is maintained. It was necessary to send warm air into the storage 1 to prevent freezing. Further, when the temperature in the refrigerator falls to 0 ° C. or less, the saturated water vapor layer in the atmosphere in the refrigerator decreases, and condensed water freezes to lower the humidity in the refrigerator, thereby causing the inside of the refrigerator to be too dry. was there.

Further, in the conventional low-temperature storage, it is necessary to provide an auxiliary cooling means such as a refrigerator in case of a shortage of cold heat due to an increase in the temperature of the atmosphere in the spring or the like.

The present invention has been made under the above-mentioned technical background, and keeps the inside temperature and the inside humidity within a certain range even under weather conditions such as abnormally low temperature, and further, makes it possible to accumulate surplus cold heat. It is intended to provide a low-temperature storage using a heat pipe.

Means for Solving the Problems As means for solving the above problems, the present invention arranges each evaporating section of a large number of heat pipes in soil around a storage space constructed underground, and Each condensing part is exposed to the atmosphere above the ground, pumping the heat from the ground with a heat pipe and releasing it to the atmosphere cools the soil around the storage space, and in a low-temperature storage that keeps the inside of the storage space at low temperature A coarse-grained material layer made of coarse-grained stone or soil is formed inside the heat pipes arranged in large numbers and on at least a side wall of each part around the storage space. It is characterized in that a sprinkling pipe is arranged at the upper part in the layer and a drainage pipe is arranged at the lower part in the coarse-grained substance layer.

Function With the configuration described above, each heat pipe pumps up the ground heat to the ground and releases it to the atmosphere, thereby freezing or cooling the soil around the storage space and keeping the storage space at a low temperature. .

When the water in the surrounding soil freezes at an abnormally low temperature, water is flowed from a sprinkling tube through the coarse-grained material layer formed around the storage space, and this water is frozen. Cooling is prevented, the inside temperature is kept within a predetermined range, and the inside atmosphere is humidified to prevent drying, and the inside of the inside is maintained at a constant humidity. In addition, excess cold heat at abnormally low temperatures freezes the water supplied from the sprinkler tube to the coarse-grained material layer, and accumulates in the form of ice in the space between the coarse-grained materials. When the ice is consumed, it acts to keep the inside of the refrigerator at a set temperature. The melted ice is drained from a drain pipe provided below the coarse-grained material layer.

Embodiment Hereinafter, an embodiment in which the low-temperature storage of the present invention is applied to a food storage will be described with reference to FIG.

A low-temperature storage 11 using a heat pipe stores food F, is constructed as an underground space by digging a floor 11a from the ground surface GL, and constructs a floor 12a and soil 12 around a wall and a ceiling.
Is separated from the outer part by a water shielding / heat insulating layer 13.

Also, in the surrounding soil 12 which is the wall of the low-temperature storage 11 inside the impermeable and heat-insulating layer 13, a number of heat pipes 14 are buried in their respective lower evaporators 14a. The lower end of the portion 14a is disposed below the floor surface 11a.
The condensing portion 14b side of each heat pipe 14 extends from the ground surface GL into the low-temperature atmosphere, and a large number of radiation fins 14c are provided on the outer periphery of each condensing portion 14b.

In addition, a coarse-grained soil layer 15 is formed on the wall, floor, and ceiling around the low-temperature storage 11, and a water-impervious layer 15a is formed in close contact with the outside thereof. A sprinkling pipe 16 is provided in the upper part of the layer 15, and a water removing pipe 17 is provided in a lower part of the coarse-grained soil layer 15. A roof 18 is formed above a portion surrounded by the coarse-grained soil layer 15.

Furthermore, outside the coarse-grained soil layer 15 and
The soil 12 between 13 is provided with a sprinkling pipe 19 at the upper part and a water removing pipe 20 at the lower part.

Next, the operation of this embodiment configured as described above will be described.

In the low temperature storage 11 for storing the food F, for example, when the temperature of the atmosphere is around 10 ° C. below the freezing point, the working fluid R evaporated in the evaporator 14 a in each heat pipe 14 by the heat in the soil 12 around the low temperature storage 11. Moves to the condensing section 14b exposed to the atmosphere, and releases the heat transported as latent heat of evaporation in the condensing section 14b to the atmosphere. Therefore, the soil 12 around the low-temperature storage 11 is cooled, and the moisture contained in the soil is frozen to form frozen soil.
The food F is cooled to about 5 ° C., and the food F is stored at a low temperature at the optimum storage temperature.

When the moisture in the soil 12 around the low-temperature storage 11 is completely frozen, if the temperature is kept as it is, the temperature in the storage drops to 0 ° C. or less, and the stored food F is frozen and There is a possibility that the humidity of the atmosphere is too low and the food F is too dry. In such cases, the sprinkler
By replenishing water into the surrounding soil 12 from 19 and freezing the replenished water, the temperature inside the refrigerator is prevented from becoming 0 ° C or lower, and by keeping the temperature in the refrigerator below 0 ° C. Prevent drying in the refrigerator.

Also, when the temperature is abnormally low, the soil 12 around the low-temperature storage 11
It is not possible to completely prevent the temperature inside the refrigerator from dropping by simply supplying water to the inside, but in such a case, the coarse soil layer
Replenish the water to 15 and freeze the replenished water to prevent the temperature inside the refrigerator from dropping below 0 ° C. Also, prevent the inside temperature from dropping below 0 ° C to prevent drying inside the refrigerator. At the same time, the inside atmosphere of the coarse-grained soil layer 15 facing the low-temperature storage 11 is humidified by moisture evaporating from the inner peripheral surface.

In this way, by providing the coarse-grained soil layer 15 capable of containing a large amount of water and freezing the water supplied to the coarse-grained soil layer 15 at an abnormally low temperature, the excess cold heat at the abnormally low temperature is formed in the form of ice. Since heat is stored in the coarse-grained soil layer 15 and can be used as supplementary cold when the cold of the atmosphere is insufficient, the period during which it can be stored at a low temperature can be extended.

The ice melted from spring to summer becomes water and accumulates in the lower part, and is discharged from the water removing pipes 17 and 20 to prepare for use of the low-temperature storage 11 in the next winter season.

Effect of the Invention As described above, the low-temperature storage according to the present invention arranges a plurality of evaporators of heat pipes in soil around a storage space constructed underground, and condenses each condensing part of these heat pipes on the ground. A large number of cold storages were placed in a low-temperature storage that exposed the air to the air, pumped the ground heat through a heat pipe and released it into the atmosphere, thereby cooling the soil around the storage space and keeping the storage space at a low temperature. A coarse-grained layer made of coarse-grained stone and soil is formed inside the heat pipe and on at least the side wall of each part of the storage space, and scattered on the upper part of the coarse-grained layer. A water pipe is provided at the lower part of the coarse-grained material layer, and a drainage pipe is provided at the lower part of the coarse-grained material layer. Can be humidified and different Since the excess cold heat at normal temperature is accumulated in the form of ice in the coarse-grained material layer and can be used as auxiliary cold heat when cold heat is insufficient,
This has the effect of greatly extending the period in which low-temperature storage is possible.

[Brief description of the drawings]

FIG. 1 is a sectional side view schematically showing a low-temperature storage according to the present invention, and FIG. 2 is a sectional view schematically showing a low-temperature storage using a conventional heat pipe. 11… cold storage, 11a… floor, 12… surrounding soil, 1
3… water barrier / insulation layer, 14… heat pipe, 14a… evaporator, 14b… condenser, 14c… radiator fins, 15… coarse soil layer, 16,19… sprinkler pipe, 17 , 20 …… Moisture removal tube, GL ……
Surface, F ... Food.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masataka Mochizuki 1-5-1 Kiba, Koto-ku, Tokyo Inside Fujikura Electric Wire Co., Ltd. (72) Inventor Wataru Yamamoto 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Corporation

Claims (1)

(57) [Claims] An evaporating section of a number of heat pipes is disposed in soil around a storage space constructed underground, and each condensing section of these heat pipes is exposed to the atmosphere above the ground. Cooling the soil around the storage space by pumping heat with a heat pipe and releasing it into the atmosphere, and keeping the storage space at a low temperature, in a low-temperature storage room where a large number of heat pipes are arranged and inside the storage space A coarse-grained material layer made of coarse-grained stone or soil is formed on at least the side wall portion of each of the surrounding parts, and a sprinkling pipe is provided above the coarse-grained material layer, A low-temperature storage, characterized by having drainage pipes arranged at the bottom.