JP2003035477A - Cold preserving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold preserving device, improved in a cooling efficiency and big in a cooling capacity. SOLUTION: The cold preserving device is provided with a storage chamber, formed in a box body, a cooling chamber, formed in the upper part of inside of the box body and capable of receiving a solid refrigerant on the inside wall, an insulating wall, formed so as to cover the outer wall of the cooling chamber and including an insulating material, and an air passage, formed between the insulating wall and the cooling chamber to conduct air to flow into the storage chamber, while the outer wall faced to the air passage and the slanted bottom surface of the inside wall for the cooling chamber are formed so as to be capable of conducting heat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold storage device for stored items that require cold storage.

[0002]

2. Description of the Related Art As a conventional cold storage device, for example,
We modified trucks and freight trains to integrate the cold storage container and transportation means and incorporate a cooling device for cooling the inside of the cold storage container, and the cold storage container and the cooling device part which are the storage parts of the cold storage device. There has been one that is provided separately so that it can be kept cold even if the transportation means is different. When transporting fresh foods in Japan, the former method has been generally adopted because of time and cost.

However, recently, when it has become more frequent to import foreign fresh foods or to export domestically produced fresh foods to foreign countries, it is possible to deal with a plurality of different transportation means. The latter, in which the cold storage container that is the storage unit can be connected to and disconnected from the cooling unit, has been adopted. An example of such a conventional technique is that described in Japanese Utility Model Registration No. 2510677. This conventional technique will be described with reference to FIGS.

That is, as shown in FIG. 8, the cold storage container 101 is a carry-in door 102 for storing the cargo to be transported.
A cooling chamber 1 that forms a box having
03, and a control box 105 for accommodating electric parts and a storage door 104 for introducing a refrigerant into the cooling chamber 103.
Is provided. As shown in FIG. 9, the inside of the cooling chamber 103 is partitioned by a bottom partition plate 106 and a side partition plate 107, which are made of a material having good thermal conductivity, to form spaces (a), (b) and (c). .

The space (a) is used as a storage chamber 109 for storing a refrigerant such as dry ice, and the space (b) is
In order to cool the inside of the cold insulation container 101, (c) is used in the ventilation path 110 and the ventilation path 111 for circulating the air in the cold insulation container 101. Then, partition plates 111a and 11b are provided in the ventilation passage 111 so that the air passing through the ventilation passage 111 flows in a curved manner, and heat is exchanged along the length of the curved passage with the bottom partition plate 106 cooled by the refrigerant. I am trying to do it. The insulation cover 108 has a cold storage container 1
A suction port 112 having a blower 113 for sucking the air in 01 and a blow-out port 114 for blowing the cooled air
Is provided.

When dry ice 115, which is generally used as a refrigerant, is stored from the storage door 104, the stored dry ice 115 absorbs the heat of sublimation required for sublimation from the surroundings, and Cool things -7
Sublimates at a temperature of 8.5 ° C. As a result, the storage chamber 109 and the air in the storage chamber 109 are cooled.

[0007] The bottom partition plate 106 in the storage chamber 109 and the initial side partition plate 107 that contains the dry ice 115 are rapidly cooled because they are in direct contact with the dry ice 115, and then the bottom partition plate 106 and the side partition plate. Since 107 forms a part of the walls of the ventilation passage 110 and the ventilation passage 111, the air in the cold insulation container 101 taken in by the blower 113 is cooled. The cooled air is again blown into the cold storage container 101 from the blowout port 114, and the fresh food, the cargo for transportation, and the like stored in the cold storage container 101 are cooled.

[0008]

However, first, FIG.
Dry ice 115 stored in storage room 109 like
Starts sublimation from a portion that easily sublimes, that is, a corner portion having a large contact area with air or a shaded portion in contact with the bottom partition plate 106 and the side partition plate 107, and eventually irregular as shown in FIG. It becomes a shape, shifts the relationship position of each other, and moves to a more stable place.

Further, according to a study by the inventors, when the surface temperatures of the bottom partition plate 106 and the side partition plate 107 are measured, the shaded portion in contact with the dry ice 115 is about −.
Although the temperature is 70 ° C., the portion where the dry ice 115 is not in direct contact shows a temperature of about −30 ° C., which is high even near 40 ° C.

That is, since there is a large temperature difference between the portion where the dry ice 115 is not in contact with the portion where the dry ice 115 is in contact, the latent heat of sublimation of the dry ice 115 is effectively utilized to cool the cooling device. In order to improve the above, it is desirable that the bottom partition plate 106 and the side partition plate 107 are brought into direct contact with the dry ice 115 to secure a low temperature region, and the contact area is enlarged as much as possible.

However, since the bottom partition plate 106 on which the dry ice 115 in the conventional storage chamber 109 is placed is horizontally provided as shown in FIG. 10, how the dry ice 115 that deforms irregularly is changed. It was unpredictable, including stochastic factors, how to move and stabilize. Then, sometimes it moved as shown in FIG. 11, and the contact area between the dry ice 115 and the side partition plate 107 became small, and it was not possible to secure the area of direct contact as large as possible. This means that the side partition plate 107 side does not maximize the latent heat of sublimation of the dry ice 115.

In the conventional example, only two surfaces of the side partition plate 107 forming the ventilation passage 110 and the bottom partition plate 106 forming the ventilation passage 111 are used as cooling fins for cooling the air in the cold insulation container 101. Moreover, since the air is cooled only by the surfaces of the bottom partition plate 106 and the side partition plate 107, the cooling cannot be performed efficiently.

Although the cooled air is blown directly from the outlet 114 into the cool container 101, in order to uniformly cool the cool container 101, a powerful blower blows the air to a distance in the cool container 101. Had to let. However, when a powerful blower is used, the amount of heat released from the blower increases, which impairs the cooling capacity.

Further, the inside of the refrigerating container 101 is controlled to an optimum storage temperature depending on the fresh food to be stored and the cargo to be transported. The control method is that the operation of the blower 113 is intermittently performed to control the temperature. However, when the operation of the blower 113 is stopped, the ventilation passage 110 and the ventilation passage 1 are stopped.
The air accumulated in 11 is rapidly cooled on the surfaces of the bottom partition plate 106 and the side partition plate 107 to become air with a lower specific temperature and a higher specific gravity, and the suction port 112 and the blowout port 114 are provided.
Sometimes it overflowed and disturbed the temperature control. In the conventional example, in order to prevent this, a louver or the like for closing each opening is provided at the suction port 112 or the blowout port 114, or an air reservoir for storing cooled air is provided. However, in this conventional technique,
Further, another component is required, and the manufacturing process is increased, so that there is a problem that the manufacturing cost increases.

An object of the present invention is to provide a cooler having improved cooling efficiency and a large cooling capacity.

[0016]

The above object is to provide a storage chamber formed inside a box body, and a cooling chamber formed in an upper portion inside the box body and capable of accommodating a solid refrigerant on an inner wall. A heat insulating wall formed to cover the outer wall of the cooling chamber and including a heat insulating material, and an air passage formed between the heat insulating wall and the outer wall of the cooler chamber, through which air in the storage chamber flows, This is achieved by a cooler in which an outer wall facing the air passage and an inclined bottom surface of the inner wall of the cooler chamber are formed so as to be able to conduct heat.

Further, it is achieved by forming the outer wall facing the air passage and the side surface of the inner wall surface of the cooling chamber so that heat can be conducted.

Furthermore, it is achieved by providing a fin provided on the outer wall in the air passage and in contact with the air in the air passage.

Furthermore, it is achieved by providing a blowout duct having a blowout port formed in a ceiling portion of the storage chamber and through which the air flowing through the air passage flows out into the storage chamber.

Further, it is achieved by providing a suction port provided in the lower portion of the storage chamber for sucking air in the storage chamber and supplying the air to the air passage.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing the external appearance of an embodiment of a cold insulation apparatus of the present invention, and particularly shows a general form of a cold insulation container for aviation. Reference numeral 1 denotes a box-shaped cold insulation container which is an example of a cold insulation device, and has a storage chamber inside which an article can be stored. 2 is a door for carrying in cargo for transportation, 3
Is a cooling chamber provided at one end side of the upper part in the cold storage container, 4 is a duct for blowing out cool air, 5 is a storage door provided for extracting or storing the refrigerant in the cooling chamber, 6 is an electric component for controlling the cooling device, An electrical box for accommodating storage batteries and the like, and 7 is a control panel for electrical articles. A cooling chamber 3 having a storage door 5 is formed to have a substantially full width on one end side of an upper part in the cold insulation container 1, and a plurality of air ducts 4 are formed from one end thereof. When the storage door 5 is opened, the storage door 5 can be fixed at the position (a) which is a substantially horizontal position.

FIG. 2 is an explanatory view in which a portion of the cooling chamber 3 including the blower duct 4 is sectioned. That is, the cooling chamber 3, the heat insulating material cover 9, the blower 11 are provided on one end side of the ceiling portion formed by the ceiling cold insulating material 1a and the side cold insulating material 1b of the cold insulating container 1.
The blowout duct 4 and the partition plate 10 are arranged as shown in the figure.

In this embodiment, a refrigerant having a solid form such as dry ice is stored in the cooling chamber 3 and is in the container. As a method of bringing this refrigerant into contact with the bottom surface and the side surfaces of the cooling chamber 3. The method of inclining the bottom surface of the cooling chamber 3 and bringing it into contact with the side surface by its own weight such as dry ice is adopted. However, in addition to the present embodiment, it is also possible to press the side surface of dry ice or the like against the wall surface of the cooling chamber so as to be brought into close contact by utilizing the elasticity of the spring or the like.

That is, in this embodiment, the cooling chamber 3 is composed of the inclined bottom surface 3a, the inclined side surface 3b, the vertical side surface 3c, the side surface 3d and the ceiling 3e, and the inclined bottom surface 3a and the inclined side surface 3b are combined at a substantially right angle as shown in the figure. The dry ice 14 stored in the cooling chamber 3 is inclined by the weight of the inclined side surface 3 by its own weight.
The b side is in constant contact.

Since the dry ice 14 stored in the cooling chamber 3 has a substantially rectangular parallelepiped shape, it is stored by forming the inclined bottom surface 3a and the inclined side surface 3b formed on the inner wall surface of the cooling chamber 3 at right angles. Further, the bottom and side surfaces of the rectangular parallelepiped dry ice 14 can come into close contact with the inclined bottom surface 3a and the inclined side surface 3b of the cooling chamber 3. In this way, the surface of the inner wall forming the ventilation passage at the position facing the inclined bottom surface 3a and the inclined side surface 3b is cooled by the dry ice 14 which is a refrigerant,
The air in the storage chamber of the container flowing through the ventilation passage 13 is cooled.

In this embodiment, the bottom and side surfaces of the inner wall surface of the cooler chamber and the outer wall of the cooler chamber are formed of one member having high thermal conductivity, but are formed of separate members. Alternatively, the bottom surface and the side surfaces of the inner wall surfaces of these cooling chambers that come into contact with the dry ice 115 and the ventilation passages 13 arranged along the wall surfaces around the cooling chambers may face the ventilation passages 1.
If it is formed with sufficient heat conductivity between the wall surface (the outer wall of the cooling chamber in this embodiment) that forms the member that constitutes the member 3, the same effect as this embodiment can be obtained.

Further, a plurality of continuous uneven cooling fins 8a and 8b are arranged as cooling fins on the surface of the inner wall forming the ventilation passage at the position facing the inclined bottom surface 3a and the inclined side surface 3b as shown in FIG. There is. In this embodiment, the shape of the cooling fins in the ventilation passage is the continuous uneven cooling fins. However, since the same effect can be expected if the heat transfer area can be expanded, it is not always necessary to use the continuous uneven cooling fins. In addition, it does not have to be uneven. For example, a large number of individual L-shaped cooling fins may be arranged, or a single cooling plate may be cut and bent into an L-shape to start a plurality of cooling fins, or a needle-shaped cooling fin. It is also possible to increase the heat transfer area by adopting.

The productivity of the cooling fins 8 and the assembling into the cooling chamber 3 are good by forming the cooling fins 8 into a shape of continuous uneven cooling fins 8a and 8b by bending a single plate. As a result, the heat transfer area that transfers in the low temperature area can be increased, and the heat exchange area in the low temperature area that contacts air can be increased.

Further, since the edge effect, which is said to have a heat exchange efficiency several times higher than the heat exchange on the surface of the fin when air is cut off at the end surface of the cooling fin, is used to reduce the depth width of the continuous uneven cooling fin. A plurality of them are provided, and the concavo-convex cooling fins 8a and 8b are arranged so as to be offset by a half width of the concavo-convex projection width so that the edge effect can be utilized more effectively.

A heat insulating material cover 9 which is a wall surface having a heat insulating material is arranged so as to enclose the cooling chamber 3 with the ventilation passages 13 interposed therebetween, and between the cooling chamber 3 and the ventilation passages 13 and the storage chamber in the container. It is adiabatically divided in the front-back and up-down directions of the container. Further, in this embodiment, the inclined bottom surface 3
The ventilation path 13c is formed by the heat insulating material cover 9 corresponding to a,
The ventilation path 13d is formed by the heat insulating material cover 9 corresponding to the inclined side surface 3b.
Is formed.

The vertical side surface 3c of the cooling chamber 3 and the side surface cold insulating material 1b
A partition plate 10 is provided between them, and one end of the heat insulating material cover 8 is in contact with the partition plate 10. The side cold insulator 1b and the partition plate 10 form an air passage 13a, and the vertical side surface 3c and the partition plate 10 form an air passage 13b.

In the conventional example, the ventilation passage is formed only by the bottom surface of the cooling chamber and the side surface on one side, and the inside of the cold insulation container is cooled by exchanging heat with the air in the cold insulation container only by the surface. In this embodiment, the inclined bottom surface 3a and the inclined side surface 3b
Further, since the three surfaces of the vertical side surface 3c are used, the air flowing in the ventilation passage is effectively cooled. The lower part of the partition plate 10 is lowered to a position where the cold air accumulated in the lower part of the cold insulating container 1 can be sucked in, and the upper part is raised to the vicinity of the ceiling cold insulating material 1a.

As a result, the air in the cold insulating container 1 sucked from the ventilation passage 13a flows to the vicinity of the ceiling cold insulating material 1a, is folded back by the ceiling cold insulating material 1a, and is blown into the ventilation passage 13b.
Flow into the vertical side surface 3 along the vertical side surface 3c of the cooling chamber 3.
It enters the ventilation passage 13c while being cooled by c. The ventilation passage 13c is provided with the continuous uneven cooling fins 8a on the inclined bottom surface 3a, and the air passing through the ventilation passage 13c is cooled using both the surface of the inclined bottom surface 3a and the continuous uneven cooling fins 8a. The cooling effect is better than the case of cooling only the surface of the inclined bottom surface 3a as in the conventional example, and the edge effect is added, so that the air flowing through the ventilation passage 13c can be cooled more effectively. Further, since the ventilation passage 13d that flows next is also provided with the continuous concavo-convex cooling fins 8b on the inclined side surface 3b, the air passing through the ventilation passage 13d also has the same surface and continuous concavo-convex shape as the ventilation passage 13c. Since both of the cooling fins 8b are used for cooling, they are cooled rapidly.

Then, at the place exiting the ventilation passage 13d,
A blower 11 and a blower duct 4 are provided, and the blower duct 4 has outlets 12a, 12b for blowing cold air,
A plurality of 12c are provided. Therefore, the ventilation passage 1
The air cooled rapidly through 3a to 13d is blower 1
1 is blown into the blower duct 4 and the outlet 12a,
12b and 12c are blown out in sequence into the cold container 1 to cool the cold container 1 uniformly as shown in FIG.

In the conventional example, an outlet for air that circulates in the cool container and cools the frozen cargo in the cool container is
Since it was installed in the upper part of the cold storage container, and the suction port was also installed in the upper part, the cold air cooled in the cooling chamber did not reach the frozen cargo stored in the cold storage container and short-circuited in the upper part of the cold storage container. There was a phenomenon that the frozen cargo could not be cooled effectively by the circuit.

In this embodiment, as shown in FIG. 4, the blowout port 12 of the blower duct 4 provided in the upper part of the cold storage container.
The cold air blown out from a, 12b, and 12c always cools the frozen cargo and flows to the lower part of the cool container because the circulating air suction port is provided at the lower part of the cool container. Since it forms a circulation circuit that is sucked in from the container and circulates largely in the cold storage container, fresh food and frozen cargo can be effectively cooled.

Further, the blowout ports 12a, 1 of the blower duct 4 are
The air blown out from 2b and 12c, which cools the fresh food and frozen cargo loaded in the cold storage container 1 and is heated to some extent, rises to the upper part in the cold storage container 1, but the outlet 12
Heat is exchanged by mixing with cold air blown out from a, 12b, and 12c, and it becomes cold cold air and falls downward again. As a result, cold air having a large specific gravity is accumulated below.

As in the conventional example, the cool air is not sent to the far inside the cool container 1 only by the wind pressure of the blower, but the cool air is guided to the far inside the cool container 1 by using the blower duct 4. The blower 10 can sufficiently achieve the function. This means that the amount of storage batteries required to operate the blower 4 can be reduced, and that long-distance transportation can be performed for a long time. The operation based on the above configuration will be described below.

When a plurality of dry ices 13 are stored as a refrigerant in the cooling chamber 3 and the power of the operation panel 6 is turned on, the blower 10 starts its operation and starts circulating the air in the cold insulation container 1.

The air in the cool container 1 is the cool container 1
It is sucked into the ventilation passage 13a from the lower side along the side heat insulation material 1b, folded back by the ceiling insulation material 1a at the upper part of the partition plate 10 to enter the ventilation passage 13b, and is cooled by the vertical side surface 3c while passing through the ventilation passage 13b. Then, it is efficiently cooled by the surface of the inclined bottom surface 3a and the continuous uneven cooling fins 8a provided on the inclined bottom surface 3a while passing through the ventilation passage 13d, and the surface of the inclined side surface 3b and the inclined side surface while passing through the ventilation passage 13d. It is efficiently cooled by the continuous concavo-convex cooling fins 8b provided in 3b, is blown into the blower duct 4 by the blower 11, and is blown out into the cool container 1 from the plural outlets 12a, 12b, 12c in order. . By repeating this, the inside of the cold insulating container 1 is cooled, and when the predetermined storage temperature is reached, a temperature sensor (not shown) is activated to stop the blower 11 and keep the inside of the cold insulating container 1 at a constant temperature.

The air passing through the ventilation passages 13c and 13d is not limited to the surfaces of the inclined bottom surface 3a and the inclined side surface 3b forming the ventilation passage, but also the continuous uneven cooling fins 8a and 8 provided in the ventilation passages.
Since it is cooled by utilizing the edge effect in b and is also effectively cooled in the vertical side surface 3c, it can be cooled to a predetermined storage temperature in a shorter time than in the conventional example.

During this time, the plurality of dry ices 14 put in the cooling chamber 3 change as shown in FIGS. The freshly stored dry ice 14 is stacked and stored in the shape shown in FIG. That is, since the inclined bottom surface 3a of the cooling chamber 3 is inclined as shown in FIG. 6, the component force Wa and the inclined side surface 3b that press the self-weight W against the inclined bottom surface 3a.
A component force Wb is applied to push the stored dry ice 14 in the shape of a rectangular parallelepiped so as to be in close contact with both the inclined bottom surface 3a and the inclined side surface 3b that is formed substantially at a right angle to the inclined bottom surface 3a. Become.

The dry ice 14 is approximately in contact with the air from the corners where it easily sublimes, and the oblique lines which are in direct contact with the inclined bottom surface 3a and the inclined side surface 3b capable of directly absorbing heat from the air in the ventilation passage. Sublimate at −78.5 ° C., cool the inclined bottom surface 3a and the inclined side surface 3b that are in direct contact with each other to about −70 ° C., and the dry ice 14 itself eventually transforms into a rugby ball-like irregular shape. go.

However, even if the dry ice 14 itself deforms into an irregular shape, since the bottom surface is inclined, component forces Wa and Wb act, so that the dry ice 14 itself is constantly inclined as shown in FIG. It is pressed against the inclined side surface 3b. The shaded area that is in direct contact with the dry ice 14 is approximately −
Although it has been cooled to an extremely low temperature of 70 ° C., the other wall surfaces of the cooling chamber 3 filled with the sublimated dry ice 14 gas are also cooled to a low temperature of about −30 ° C.

By providing the inclined bottom surface 3a and the inclined side surface 3b at a substantially right angle to the inclined bottom surface 3a, both inclined surfaces and the surface of the dry ice 14 are in direct contact with each other. To secure as much area as possible in direct contact means passing through the ventilation passages 13c and 13d by the surfaces of the inclined bottom surface 3a and the inclined side surface 3b and the continuous uneven cooling fins 8a and 8b through the inclined bottom surface 3a and the inclined side surface 3b. The air is cooled strongly, and the cooling effect is significantly increased. The cooling chamber 3 is not in direct contact with the dry ice 14 but is cooled to about -30 ° C.
By using the vertical side surface 3c of the as a third cooling surface,
The inside of the cool container can be cooled more efficiently than in the conventional example.

Incidentally, FIG. 7 shows experimental data of cooling characteristics in the cold insulation containers according to this embodiment and the conventional example. The vertical axis shows the temperature inside the cold storage container, the horizontal axis shows the elapsed time,
The characteristic (a) is the target calculation value of the present embodiment, the characteristic (b) is the conventional example, and the characteristic (c) is the target calculated value of the present embodiment. This is an experimental value in which 50 kg of dry ice was put into a cooling chamber of a cold-retaining container stabilized at 35 ° C. by leaving it in a room at room temperature of 35 ° C. for a long time, and a temperature change in the cold-retaining container was measured. The target cooling temperature is -18 that is required to carry general refrigerated cargo.
℃ was set. The size of one piece of dry ice 14 used as a refrigerant in this experiment is about 250 mm × about 140 mm.
mm × about 60 mm and about 2 kg.

According to the calculation result of this example, -26 ° C. could be expected as in the characteristic (c). According to the experimental results, the characteristics during pull-down, such as the characteristic (a), almost satisfied the calculated values, the cooling reached temperature also showed a value close to the calculated value, and intermittent operation was performed at about -23 ° C, and the target value of -18 ° C I am satisfied with a margin of about 5 ° C. The intermittent operation of the blower reduces the consumption of the storage battery and enables long-term operation. On the other hand, in the conventional example, due to the small contact area with dry ice and the small heat dissipation area,
The temperature in the cold storage container has begun to rise gradually after 6 hours without reaching 18 ° C.
This is because the dry ice is not always in direct contact with the wall surface of the cooling chamber, the cooling area is small, and there is no blower duct that blows cooling air to a long distance inside the cool container, so the capacity of the blower is large. This is because the storage battery for operating the blower is heavily consumed and the rotation speed of the blower becomes low after 6 hours, and the cooling air cannot be circulated sufficiently.

As described above, in this embodiment, the dry ice and the wall surface of the cooling chamber are in contact with each other for a long period of time. Further, the heat dissipation area is increased by the continuous uneven cooling fins, and the wall surface of the cooling chamber is utilized as the third cooling surface. In addition, the ventilation duct is adopted to reduce the power consumption of the blower, thereby reducing the consumption of the storage battery. This makes it possible to lengthen the transportation time of the cold storage container per time, and to transport the container further.

Further, as described above, in the conventional technique, it is difficult to determine how the dry ice is deformed because the bottom surface of the dry ice storage box is horizontal, and the deformation is not necessarily the dry ice. It does not always come into contact with the side surface on the ventilation path side, and thus it was difficult to reliably form an area on the ventilation path side that contacts dry ice, which has a high cooling effect, for a long period of time.

In the above-described embodiment, even when the dry ice 14 is sublimated and its shape is irregularly deformed, the dry ice 14 is surely pressed against the inclined side surface 3b by the component force Wb. The side surface 3b is also about -7, which is close to the sublimation temperature.
The surface temperature of 0 ° C can be secured. Then, this low temperature region is transmitted to the continuous concavo-convex cooling fins 8a and 8b provided on the inclined bottom surface 3a and the inclined side surface 3b, and the edge effect of the cooling fins 8a and 8b arranged by shifting by a half width of the concavo-convex protrusion width. Is also used to efficiently cool the air flowing in the ventilation passage. Further, in the conventional example, only two surfaces of the cooling chamber were used as cooling surfaces, but in the present embodiment, the vertical side surface 3c of the cooling chamber 3 is effectively used as the third cooling surface, so that the dry ice 14 The sublimation latent heat can be utilized without waste.

In this embodiment, the surface of the cooling medium such as dry ice is brought into close contact with the wall surface of the cooling chamber by inclining the bottom surface of the cooling chamber, but the elasticity of a spring or the like is used to cool the dry ice. It is also possible to press them against the wall surface of the room and bring them into close contact with each other. Further, although the cooling fin provided in the ventilation passage is the continuous uneven cooling fin in this embodiment,
This can be expected to have the same effect if the heat transfer area can be expanded, so it is not necessarily continuous,
Further, it does not necessarily have to be uneven. It is possible to arrange a large number of L-shaped cooling fins, make a cut in a single cooling plate to start up in an L-shape, or use a needle-shaped cooling fin to expand the heat transfer area. is there.

The air intake of the ventilation passage 13a is provided below the cold insulation container 1 and has a large specific gravity to be stored below.
Since the temperature difference between the cooling chamber 3 and the continuous concavo-convex cooling fins 8a and 8b is made as small as possible by taking in cold air, it is possible to reduce the consumption of dry ice whose sublimation speed largely changes due to the temperature difference. You can
It is possible to cool the cold storage container for a long time with a small amount of dry ice. In addition, since the cooling effect is greatly improved, the operating rate of the blower 11, that is, the operating time, can be reduced, and the number and consumption of the storage batteries mounted can be reduced. As a result, it is possible to reduce the cost by reducing the amount of dry ice to be initially prepared, reduce the cost for the storage battery, and also reduce the weight of that amount, thereby reducing various expenses related to transportation. Further reduction is possible.

In the case of a cold insulation container which uses dry ice as a refrigerant, when the operation of the blower is stopped, the air accumulated in the ventilation passage is cooled to become air with a low temperature and a high specific gravity, and is discharged from the ventilation passage or the outlet. It overflowed and overcooled the inside of the cold storage container, making it difficult to control the temperature inside the cold storage container. In order to prevent this, in the conventional example, the outlet is provided with a louver for closing the outlet, an air reservoir chamber for storing cooled air, or the like is provided.

However, this conventional technique has a problem that another member is required to form them, the parts cost and the manufacturing process increase, and the manufacturing cost increases. In the present embodiment, the partition plate 10 is extended to the vicinity of the ceiling heat insulating material 1a, so that even if the air remaining in the ventilation passage is cooled to become air having a low temperature and a high specific gravity, it flows backward through the ventilation passage 13a. In addition, since the blow-out duct 4 is provided in the ceiling portion inside the cool container 1, it does not overflow from the blow-out port 12 and the temperature inside the cool container can be easily controlled.

When transporting fresh food or frozen cargo in a cold container, about 2 kg of dry ice per block is loaded as a refrigerant for cooling near 100 kg. This dry ice loading operation is a labor-intensive operation because it is performed manually. In the present embodiment, in order to reduce this labor, the storage door 5 is fixed substantially horizontally when the storage door 5 for introducing the refrigerant is opened as shown in FIG. When the dry ice 14 is loaded in the cooling chamber 3, the storage door 5 fixed at the horizontal position (a) is used as a work table to temporarily store the dry ice 14, thereby reducing labor and improving work efficiency. It is possible to improve the work efficiency and shorten the working time.

In this embodiment, dry ice is used as the solid-state refrigerant, but any refrigerant that is solid or solid that can be brought into contact with the wall surface of the cooling chamber or that can be stored in or taken out from the cooling chamber is equivalent. The effect of can be produced.

[0058]

As described above, according to the present invention,
A cooling device with improved cooling efficiency and a large cooling capacity can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a first embodiment of a cold storage device of the present invention.

FIG. 2 is a vertical cross-sectional view showing a configuration of a portion including a blower duct of a cooling chamber of the cold insulator shown in FIG.

FIG. 3 is a perspective view showing a configuration of continuous uneven cooling fins arranged on an inclined bottom surface and an inclined side surface of the cold insulator shown in FIG.

4 is a vertical cross-sectional view of the flow of air inside the cooler shown in FIG. 1. FIG.

FIG. 5 is a vertical cross-sectional view showing a first state in which dry ice is stored in the cooling chamber shown in FIG.

FIG. 6 is a vertical cross-sectional view showing a state when the dry ice in the cooling chamber shown in FIG. 5 sublimes into an irregular shape.

FIG. 7 is a graph showing cooling characteristics when dry ice is stored in a cooling chamber of the cooler apparatus shown in FIG. 1 and cooled.

FIG. 8 is a perspective view showing an external appearance of a conventional cooler.

FIG. 9 is a cross-sectional view illustrating the configuration of a conventional cooling chamber.

10 is a cross-sectional view showing an initial state in which dry ice is stored in the conventional cooling chamber shown in FIG.

FIG. 11 is a cross-sectional view showing a state when the conventional dry ice shown in FIG. 10 sublimes into an irregular shape.

[Explanation of symbols]

1 ... Cooling container 1a ... Ceiling cold insulating material 1b ... Side cooler 3 ... Cooling chamber 3a ... inclined bottom surface 3b ... inclined side surface 3c ... Vertical side surface 4 ... Blower duct 5 ... Storage door 7 ... Operation panel 8 ... Cooling fin 9 ... Insulation cover 10 ... Partition board 11 ... Blower 12 ... Blowout port 13 ... Ventilation path 14 ... Dry ice 101 ... Cooling container (cooling device) 103 ... Cooling chamber 104 ... Storage door 106 ... Bottom partition plate 107 ... Side partition plate 108 ... Insulation material cover 109 ... Cooling chamber 110 ... Ventilation path 111 ... Ventilation path 112 ... Suction port 113 ... Blower 114 ... Blowout port 115 ... dry ice.

Claims (5)

[Claims] 1. A storage chamber provided inside a box, a cooling chamber provided inside the box and capable of accommodating a solid refrigerant and mounting it on an inner wall surface of the box, the cooling chamber and the cooling chamber. A heat insulating wall arranged between the heat insulating wall and the cooling chamber, the air insulating passage being provided between the heat insulating wall and the cooling chamber, and an air passage through which air in the storage chamber flows; A cooler in which an inner wall surface of the cooling chamber and an inclined bottom surface of the inner wall of the cooling chamber are provided to allow heat conduction. 2. The cooler according to claim 1, wherein an inner wall surface of the air passage and a side surface of an inner wall of the cooling chamber are provided so as to be able to conduct heat. 3. The cold storage device according to claim 1, further comprising a fin provided on the inner wall surface of the air passage in the air passage and contacting the air in the air passage. 4. The blowout duct according to claim 1, further comprising a blowout duct disposed at a ceiling portion of the storage chamber, the blowout duct having a blowout port through which the air flowing through the air passage flows into the storage chamber. Cooler. 5. The cold storage apparatus according to claim 1, further comprising a suction port provided in a lower portion of the storage chamber for sucking air in the storage chamber and supplying the air to the air passage.