JP2020190382A - Transportable cold insulation box - Google Patents

Abstract

To provide a transportable cold insulation box that reduces power usage, slows storage battery drain, thereby keeps a low-temperature state for a long time, and can withstand long-time transportation.SOLUTION: A second condenser 20, a heat storage agent 21, and a movable plate 22 comprising a metal joint plate 24 to be curved depending on a temperature change are arranged in a heat storage chamber 9 as means for preventing excessive cooling in a storage chamber 5. The metal joint plate 24 is curved depending on the temperature change in the storage chamber 5, and thereby the movable plate 22 moves up and down, opens and closes a communication opening 9a between the storage chamber and the heat storage chamber, and supplies and stops warm air in the heat storage chamber 9.SELECTED DRAWING: Figure 1

Description

The present invention relates to a portable cold storage which is transported by a truck or the like after the cold storage agent is frozen by an evaporator, and the inside of the cold storage is cooled by the frozen cold storage agent during the transportation.

The portable cold storage is provided with a cold storage agent and an evaporator for freezing the cold storage agent inside a portable storage storage with casters at the bottom, and is used as follows.

First, in a distribution center or the like, a portable cold storage is connected to an AC power source, a compressor is operated by the AC power source, and the cold storage agent is frozen by an evaporator. After freezing the cold storage agent, the blower is operated while controlling the operation of the compressor to supply the cold air cooled by the evaporator and the cold storage agent into the storage to cool the inside of the storage. At that time, cold air tends to stagnate in the lower part of the storage, which may freeze the article and reduce the commercial value. Therefore, in order to prevent the inside of the storage from being overcooled, the inside of the storage is kept at a predetermined low temperature by controlling the temperature control heater for AC by heating with an AC power source. Since the compressor generates heat during operation of the compressor, the blower for the condenser is operated with an AC power source to release the generated heat to the outside of the storage. In addition, the storage battery is charged when it is connected to an AC power supply.

Next, when transporting the refrigerated material, the portable cold storage is separated from the AC power source, the blower is operated by the charged storage battery, and the cold air cooled by the cold storage agent is supplied to the storage to cool it. On the other hand, as in the case of connecting an AC power supply, by heating and operating the DC temperature control heater with a storage battery to prevent overcooling in the storage, the goods can be smoothly transported in a low temperature state. ..

As a means for preventing overcooling in the storage, a method of repeatedly turning on and off the temperature control heater at predetermined time intervals when heating with the temperature control heater has been reported (Patent Document 1).

Japanese Unexamined Patent Publication No. 11-63779

However, if a temperature control heater is used as a means for preventing overcooling in the storage, the amount of electric power used increases to heat the AC temperature control heater when the AC power supply is driven. Further, when the storage battery is driven, by using electric power for the DC temperature control heater, the storage battery is consumed quickly, and the time for maintaining the low temperature state by the blower is shortened, so that the transportable time is shortened. ..

Therefore, the present invention solves the above-mentioned problems of the prior art, reduces the amount of electric power used, and slows down the consumption of the storage battery to maintain a low temperature state for a long time and to withstand long-term transportation. The purpose is to provide.

That is, one aspect of the present invention relates to the portable cold storage shown below.

The portable cold storage according to one aspect of the present invention is
A storage room for storing goods and
A ventilation path separated from the storage chamber by a partition member,
With the cold storage agent installed in the ventilation passage,
An evaporator that cools the cold storage agent and
The first condenser that exhausts heat together with the blower for the condenser,
A second condenser that heats the heat storage agent,
Compressors operated by AC power and
A blower that forcibly circulates the cold air in the ventilation passage into the storage chamber,
A storage battery that supplies power to the blower when the AC power is turned off,
Equipped with
The communication opening between the storage chamber, the heat storage agent, and the second condenser is partitioned by a plate so as to be openable and closable.

As described above, according to the portable cold storage according to the above aspect of the present invention, in order to prevent overcooling in the cold storage, heat generated by the second condenser and a heat storage agent for storing the heat are used. However, the hot air is sent into the storage chamber by opening and closing the movable plate. Therefore, the amount of electric power used in the conventional AC temperature control heater can be reduced. Further, since the DC temperature control heater is not used, the consumption of the storage battery can be delayed, and the storage battery can be transported for a long time.

It is sectional drawing of the portable cold storage in embodiment of this invention. It is a front view of the portable cold storage in embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
FIG. 1 is a cross-sectional view of the portable cold storage 1 according to the embodiment of the present invention. FIG. 2 is a front view of the portable cold storage 1 according to the embodiment of the present invention.

The portable cold storage 1 includes at least a storage chamber 5, a ventilation passage 11, a cold storage agent 17, an evaporator 16, a first condenser 14, a second condenser 20, a compressor 13, and the like. It includes a blower 18, a storage battery 12, and a movable plate 22.

The storage chamber 5 stores articles to be kept cold inside.

The ventilation passage 11 is separated from the storage chamber 5 by a partition member.

The cold storage agent 17 is installed in the ventilation passage 11.

The evaporator 16 cools the cold storage agent 17.

The first condenser 14 performs a heat exhausting operation together with the condenser blower 15.

The second condenser 20 heats the heat storage agent 21 and stores the heat in the heat storage agent 21.

When the compressor 13 is connected to the AC power supply 30, the compressor 13 is operated by the AC power supply 30.

The blower 18 forcibly circulates the cold air in the ventilation passage 11 into the storage chamber 5.

The storage battery 12 supplies power to the blower 18 when the AC power supply 30 is disconnected to operate the blower 18.

The communication opening 9a between the storage chamber 5 and the heat storage agent 21 and the second condenser 20 in the heat storage chamber 9 is partitioned by a movable plate 22, which is an example of a plate, so as to be openable and closable. The movable plate 22 is movable with respect to the communication opening 9a between the open position A2 (see the alternate long and short dash line in FIG. 2) and the closed position A1 (see the solid line in FIGS. 1 and 2).

The portable cold storage 1 is composed of a heat insulating box 2 that opens forward, a back plate 3 and a deck pan 4 as examples of partition members, a storage room 5, a front door 6, and a lower part of the heat insulating box 2. It is composed of a cold storage chamber 7, a machine room 8 formed above the heat insulating box 2, and a heat storage chamber 9 formed at a space below the heat insulating box 2.

The back plate 3 is erected at a distance inside the back wall 2a of the heat insulating box 2. The deck pan 4 is attached to the lower part of the heat insulating box 2 so as to be openable and closable at intervals. The storage chamber 5 is surrounded by the back plate 3 and the deck pan 4 in the heat insulating box 2. The front door 6 closes the front opening of the storage chamber 5 so as to be openable and closable.

A plurality of casters 10 are provided in the lower part of the heat insulating box 2 of the portable cold storage 1, and when the portable cold storage 1 is pushed or pulled, the wheels of these casters 10 rotate, respectively. The portable cold storage 1 can be moved.

The ventilation passage 11 is formed by the space between the back wall 2a of the heat insulating box 2 and the back plate 3, and the ventilation passage 11 and the space of the cold storage chamber 7 are connected to each other.

Since the heat storage chamber 9 is arranged slightly below the center of the heat insulating box 2 when viewed from the front, the ventilation passage 11 is configured to surround the heat storage chamber 9.

An evaporator 16 is installed in the cold storage chamber 7, and a cold storage agent 17 is attached to a member related to heat exchange in the evaporator 16. A blower 18 is installed on the back plate 3, and by operating the blower 18, the cold air cooled by the evaporator 16 of the cold storage chamber 7 and the cold storage agent 17 is sent into the storage chamber 5 via the ventilation passage 11. Can be supplied to. The cold air supplied into the storage chamber 5 returns to the cold storage chamber 7 again from the cold air suction port 19 installed in front of the deck pan 4. In this way, the air in the storage chamber 5 is circulated.

In the machine room 8, a storage battery 12, a compressor 13, a first condenser 14, and a blower for the condenser 15 are installed.

A second condenser 20 is arranged in the heat storage chamber 9, and a heat storage agent 21 is attached to a member related to heat exchange in the second condenser 20. When the heat storage agent 21 obtains the same heating performance as the conventional DC temperature control heater, for example, the heat generation amount of the conventional DC temperature control heater is 16 W, the transportation time is 18 hours, and the DC temperature control heater is used. Assuming that the operating time of the heat storage agent 21 is 9 hours, which is 1/2 of the transportation time, the amount of heat storage required for the heat storage agent 21 is 520 kJ. Examples of the material of the heat storage agent include sodium acetate hydrate and sodium thiosulfate hydrate.

A heat insulating material 26 is arranged on the inner wall of the heat storage chamber 9. Specifically, the heat insulating material 26 is arranged on the peripheral portion of the heat storage agent 21 and the second condenser 20 and the surface portion of the movable plate 22. These heat insulating materials 26 suppress the heat generated from the second condenser 20 and the stored heat storage agent 21 from being transmitted to the ventilation passage 11 and the cold storage chamber 7.

A movable plate 22 that can move up and down to open and close the communication opening 9a is installed in the communication opening 9a in front of the heat storage chamber 9. Rails 23 are arranged at both ends of the movable plate 22 in the lateral direction so that the vertical opening and closing operation can be smoothly performed. A metal joint plate 24 is installed between the upper end of the movable plate 22 and the upper portion of the heat storage chamber 9 so as to be connected to the movable plate 22 and curved in the movable direction of the movable plate 22 in response to a temperature change. , The movable plate 22 is configured to open and close the communication opening 9a by a bending operation due to a temperature change of the metal joint plate 24. Specifically, between the upper end of the movable plate 22 and the upper part of the heat storage chamber 9, a metal joint plate 24 that is curved in response to a temperature change is curved in a bow shape whose central portion protrudes downward and is in the center thereof. The portion is arranged so as to be connected to the movable plate 22. Therefore, the metal joint plate 24 is deformed as the room temperature in the storage chamber 5 changes, so that the movable plate 22 can move up and down while being guided by the rail 23. By moving the movable plate 22 up and down, the space between the storage chamber 5 and the heat storage chamber 9 can be opened and closed.

The metal bonding plate 24 that curves in response to a temperature change is known as a bimetal. Bimetal is made by sticking two metal plates with different coefficients of thermal expansion together, and utilizes the property that the bending method changes with temperature change, and is used for, for example, a thermostat. The displacement amount D of the bimetal is represented by D = KΔTL ² / 4t. Here, K is the curvature coefficient (1 / K), ΔT is the amount of temperature change (K), L is the length of the bimetal (mm), and t is the thickness of the bimetal (mm). For example, when Cu—Ni—Mn is used on the high expansion side and Ni—Fe is used on the low expansion side as the bimetal material, K = 20 × ^10-6 . Further, when ΔT = 1, L = 600, and t = 0.5, D = 3.6. That is, when the temperature of the lower part in the storage chamber 5 drops from 0 ° C. where the water freezes to -1 ° C., the metal joint plate 24 changes from the downward convex state of FIG. 2 to the state of being substantially aligned in the lateral direction. Due to the deformation, a displacement amount of 3.6 mm is generated in the metal joint plate 24, and the movable plate 22 connected to the metal joint plate 24 is raised by 3.6 mm accordingly. As a result, the communication opening 9a is opened, and the storage chamber 5 and the heat storage chamber 9 communicate with each other. Therefore, the warm air in the heat storage chamber 9 warmed by the second condenser 20 and the heat storage agent 21 is supplied to the storage chamber 5 through the communication opening 9a, and raises the temperature in the storage chamber 5. Thereby, the article can be prevented from freezing. Further, when the temperature in the storage chamber 5 rises to 0 ° C. again due to the warm air, the metal joint plate 24 is deformed downwardly and convexly in the direction opposite to the above, and the movable plate 22 is lowered to open the communication opening 9a. When closed, the storage chamber 5 and the heat storage chamber 9 are separated by a movable plate 22, and the supply of warm air to the storage chamber 5 is stopped.

A heat insulating material 26 is installed on the heat storage chamber 9 side of the movable plate 22, thereby suppressing the heat generated from the second condenser 20 and the stored heat storage agent 21 from being transmitted to the metal joint plate 24.

As the heat insulating material 26, for example, by using a thin heat insulating material 26 such as an airgel non-woven fabric composite heat insulating material, the heat storage chamber 9 can be made compact, and the heat storage chamber 5 can be kept cold without reducing the volume of the storage chamber 5. The storage 1 can be configured.

The compressor 13, the first condenser 14, the second condenser 20, and the evaporator 16 are connected to each other by a refrigerant pipe 25 to form a refrigeration cycle.

According to the above embodiment, as a means for preventing overcooling in the cold storage, heat generated by the second condenser 20 and a heat storage agent 21 for storing the heat are used, and the hot air is generated by opening and closing the movable plate 22. Is used in the storage chamber 5. Therefore, the amount of electric power used in the conventional AC temperature control heater can be reduced. Further, since the DC temperature control heater is not used, the consumption of the storage battery 12 can be delayed, and the storage battery 12 can be transported for a long time.

Further, a movable plate 22 having a metal bonding plate 24 that curves in response to a temperature change is arranged in a communication opening 9a between the storage chamber 5 and the heat storage chamber 9, and metal bonding is performed in response to a temperature change in the storage chamber 5. When the plate 24 is curved, the movable plate 22 moves up and down to open and close the communication opening 9a, and supplies or stops the warm air in the heat storage chamber 9. With such a configuration, the amount of electric power used can be further reduced, and the storage battery 12 can be consumed more slowly, so that the low temperature state can be maintained for a long time and the storage battery 12 can be transported for a long time.

In addition, by appropriately combining any embodiment or modification of the various embodiments or modifications, the effects of each can be achieved. Further, it is possible to combine embodiments or examples, or to combine embodiments and examples, and it is also possible to combine features in different embodiments or examples.

According to the above aspect of the present invention, there is provided a portable cold storage which can prevent the articles in the storage chamber from freezing without using the power of the AC power source and the storage battery, and can be transported for a long time with energy saving. be able to.

1 Portable cool box 2 Insulation box 2a Back wall 3 Back plate 4 Deck pan 5 Storage room 6 Front door 7 Cold storage room 8 Machine room 9 Heat storage room 9a Communication opening 10 Caster 11 Ventilation path 12 Storage battery 13 Compressor 14 First condensation Vessel 15 Blower for condenser 16 Evaporator 17 Cold storage agent 18 Blower 19 Cold air suction port 20 Second condenser 21 Heat storage agent 22 Movable plate 23 Rail 24 Metal joint plate 25 Refrigerant piping 26 Insulation material 30 AC power supply

Claims (4)

A storage room for storing goods and
A ventilation path separated from the storage chamber by a partition member,
With the cold storage agent installed in the ventilation passage,
An evaporator that cools the cold storage agent and
The first condenser that exhausts heat together with the blower for the condenser,
A second condenser that heats the heat storage agent,
Compressors operated by AC power and
A blower that forcibly circulates the cold air in the ventilation passage into the storage chamber,
A storage battery that supplies power to the blower when the AC power is turned off,
Equipped with
A portable cold storage compartment in which the communication opening between the storage chamber, the heat storage agent, and the second condenser is partitioned by a plate so as to be openable and closable. A claim that a metal joint plate that is connected to the plate and that bends in the movable direction of the plate in response to a temperature change is installed, and the plate opens and closes the communication opening by the bending operation of the metal joint plate due to the temperature change. The portable cold storage according to 1. The portable cold storage according to claim 1 or 2, wherein a heat insulating material is arranged on the peripheral portion of the heat storage agent and the second condenser and the surface portion of the plate. The portable cold storage according to any one of claims 1 to 3, wherein the heat storage agent, the second condenser, and the plate are arranged in the lower part of the storage chamber.

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