JPS62142973A - Cryogenic storage shed - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a low temperature storage warehouse in which the interior of the warehouse is cooled by freezing the ground using a heat pipe.

"Conventional technology" Generally, when storing grains such as rice, food, etc.
It is required to be carried out in an environment of constant low temperature and constant humidity.

Conventionally, this type of storage facility has been applied, for example, to a low-temperature storage warehouse configured to use a refrigerator to maintain the interior at a constant temperature, but the equipment cost (initial cost) and running cost are high. It is expensive.

“Problems to be Solved by the Invention” As a result of intensive research aimed at solving these problems, the applicant and others have discovered that natural cold energy can be stored for long periods in the form of frozen soil or ice using heat pipes in cold regions. For example, we have come up with the idea that the initial cost and running cost will be lower compared to storage using conventional refrigerators.

Therefore, as a result of conducting various experiments on the creation of frozen soil using heat pipes and researching the possibility of using it as a low-temperature storage facility, the applicant et al. For this purpose, the form of latent heat is ideal, and for this purpose, the ground is more preferable than bedrock, and among the ground types, it is known that cohesive soil, which generally has a high moisture content, is more suitable than sandy soil. I got it.

Since the present invention was made in view of the above circumstances, it is possible to reduce initial cost and running cost,
Moreover, it is an object of the present invention to provide a low-temperature storage with improved applicability to heat pipes.

``Means for Solving Problems J'' The low-temperature storage according to the present invention uses an excavated hole opened to the outside air that is excavated on the surface of the ground as a storage location, and freezes the ground using a heat pipe buried around the excavated hole. In order to cool the inside of the drilled hole, an ice heat storage tank is provided at the bottom of the floor of the drilled hole, a roof is placed on the ground around the drilled hole to cover the top surface of the drilled hole, and the heat pipe is connected to the lower end of the roof. The ice was buried so that it reached the inside of the ice heat storage tank.

``Function'' According to the above configuration, in winter, it is possible to convert the energy from the cool outside air into cold heat in the form of frozen soil and ice in the ground surrounding the excavation type, and also to supply water to the ice heat storage tank installed under the floor of the excavation hole. The cold storage thermal energy can be used to keep the inside of the borehole at a constant low temperature during spring and summer.

[Example J] Hereinafter, the present invention will be described with reference to the drawings. Figures 1 and 2 show an embodiment of the present invention, and the symbol l in the figures indicates an excavated hole (inside the warehouse) that opens to the outside air and is drilled on the surface of the ground G.
This shows that. This hole L is excavated in a generally rectangular shape as a whole to constitute a storage area for food, etc. In the illustrated example, the bottom surface of this excavated rectangular shape and the sloped surface surrounding it are uphill. On top, a bottom slab (floor) 2 and a side slab 3 are constructed with concrete, respectively.
Moreover, a foundation 6 on which a roof 5 to be described later is placed is formed on the upper surface of the surrounding embankment 4.

A membrane 7 is laid on the top surfaces of the bottom slab 2, side slabs 3, embankment 4, and foundation 6 so as to cover the entire surface thereof, and has the effect of saturating the water in the soil around the excavated hole 1. . Further, a heat insulating material is provided between the bottom plate 2 and the side plates 3 and the membrane 7 to improve heat retention inside the excavated hole (storage space) I. Inside this excavated hole 1 and above the side plate 3, a cooling duct 9 is installed via a support wall 8.
is installed to maintain a uniform temperature inside the excavated hole 1.

On the other hand, in the lower part of the bottom plate 2, there is provided an ice heat storage tank 10 having a square tubular groove cross section and extending along the length direction of the bottom plate 2.

This ice heat storage tank 10 stores ice-making water 11 in an internal space surrounded by a top plate IQa, a bottom plate 10b, and left and right side plates 10c and lQd.

The ground G around the excavated hole 1 has this ground G.
A heat pipe 1 that cools the inside of the excavation hole 1 by freezing
5 are installed in stages along the circumference of the excavated hole I at equal intervals.

As shown in FIG. 1, this heat pipe 15 has a working fluid sealed in a long cylindrical airtight chamber 2316 that has been sufficiently deaerated, so that heat f hyperactivity occurs as the phase of the fluid changes. In the illustrated example, the upper end L6a of the airtight container 16 protrudes from the base 6, and its lower side extends parallel to the side plate 3 to the vicinity of the ice heat storage W110, and its tip (lower end) 16b It has a structure in which it is buried so that it reaches the inside of the ice heat storage tank IO. In addition, this airtight container 16
A plurality of heat receiving and dissipating fins 17 are provided protruding along the length of the upper outer periphery of the upper part exposed to the outside air in order to increase the efficiency of heat inflow and outflow. Note that the heat pipes 15 arranged on the left and right sides of the excavated hole are arranged with a difference in height from top to bottom so that their lower ends do not interfere in the ice heat storage tank 10.

A roof 5 covering the upper surface of the excavated hole 1 is placed on a foundation 6 around the excavated hole 1, and has a structure in which a roof plate 5b having an insulating structure is placed over a beam 5a having a truss structure. Note that the structure of the roof 5 is not limited to this one.

Next, a method of constructing a low-temperature storage with such a configuration, a method of using the same, etc. will be explained.

As shown in FIG. 1, in order to construct this low-temperature storage, the surface of the ground at the storage location is excavated to form holes for forming the storage space and the ice heat storage tank 10, and
Excavating the load for burying the heat pipe. Next, the heat pipe I5 is installed in this groove, and after the ice heat storage tank construction 0 is constructed in the groove, these are backfilled.

Then, concrete is poured on top of these and the bottom plate 2 is
After constructing the side plates 3, foundation 6, etc., a heat insulating material and membrane 7 are laid on top of these, and a roof 5 is attached to the top of the foundation 6, creating a low-temperature storage facility as shown in Figure 1. Constructed.

This construction is a simple work of excavating the ground from the surface, backfilling, and forming concrete, and does not require special techniques (such as polling) for the construction (such as installing heat pipes). Since the heat pipe I5, which is maintenance-free in place of the machine, constitutes the cold heat source, its installation is simple and costs can be reduced.

To use a low-temperature storage with such a configuration, first, in winter, the upper part of the heat pipe 15 is cooled with cold air, frozen soil F is built around the heat pipe 15, and ice is made in the ice storage tank 10. , stores supercooled outside air energy.

That is, when the upper part of the heat pipe I5 is cooled by cold air in winter, the working fluid in the airtight container 16 condenses into a liquid, which falls down the tube wall of the airtight container due to gravity. As a result, the cold heat is carried to the lower part, and the ground G around the airtight container 16 is frozen by the carried cold heat, and frozen ground F is built around the airtight container 16, as shown in FIG. , ice is also made in the ice heat storage tank 10. This phenomenon is repeated in the winter, causing water to accumulate in the ice heat storage tank IO, and also causing water to accumulate in the ice heat storage tank IO.
Frozen soil F is built around the frozen soil F, and supercooled outside air energy (cold energy) is stored in the form of frozen soil F and ice.

On the other hand, during warm spring and summer months, the cold thermal energy stored in the ice heat storage tank 10 and the frozen soil F is released, and the temperature inside the refrigerator can be maintained at a low temperature.

In addition, in the surface structure, the inside of the storage space (excavation hole) is insulated with a heat insulator, etc., so that the inside of the refrigerator does not cool down properly in severe winters, and the ice heat storage tank 10 As a result, a large amount of cold energy can be stored in a source other than the frozen soil F, making it possible to efficiently store cold heat.

According to the low-temperature storage with the above structure and operation, the excavated hole I is used as a storage place, a heat pipe 15 is installed around it, an ice heat storage tank 10 is installed under the floor, and the upper surface of the excavated hole I is covered with a roof 5. The initial cost is low because the heat pipe 15 is maintenance-free, and since frozen soil F, water, etc. are constructed, the running cost is hardly a burden. be.

In the above-mentioned embodiment, the excavated hole 1 itself is used as a storage place and the roof 5 is attached to the excavated hole 1 itself.However, large-diameter corrugated pipes, box culverts, etc. are installed in this excavated hole 1, and these are used as a storage place. It is also possible to create a structure in which it is backfilled.

``Effects of the Invention'' As explained above, according to the present invention, supercooled outside air energy can be stored in the ground around the excavation hole as frozen soil and ice in the winter. Water can be stored as water in the ice storage tank, and conversely, during the warm spring and summer months, the inside of the drilling hole can be kept at a low temperature by using the cold water, so the initial cost and running cost can be reduced. Cold storage can be provided. Furthermore, since the structure is such that the lack of cold storage heat caused by the heat pipe is supplemented by the ice heat storage tank, the applicability to low-temperature storage using heat pipes can be improved. Further, according to the present invention, the structure is such that the ground is excavated from the surface and the heat pipe is installed in the excavated hole, so there is an advantage that the heat pipe can be easily installed.

[Brief explanation of drawings]

1 and 2 show an embodiment of the low temperature storage according to the present invention, so FIG. 1 is a side sectional view showing the structure of the low temperature storage, and FIG. 2 is a plan view thereof. G...Ground, 1...Drilling hole, 2...
...Bottom plate, 3...Side plate, 1...Embankment, 5
...Roof, 6...Foundation, 7...
Membrane, 8...Supporting wall, 9...Cooling duct, jO...Water storage tank, 15...
Heat pipe, 16...airtight container.

Claims (1)

[Claims] A low-temperature storage facility is a low-temperature storage facility that is used as a storage location in a borehole that is opened to the outside air and that is drilled on the surface of the ground, and that cools the inside of the borehole by freezing the ground using a heat pipe buried in the ground around the borehole. An ice heat storage tank is provided at the bottom of the floor of the hole, a roof is placed on the ground around the hole to cover the top surface of the hole, and the lower end of the heat pipe reaches inside the ice heat storage tank. A low-temperature storage facility characterized by being buried around an excavation hole in a state of