JPH06137733A - Low temperature chamber - Google Patents

Abstract

PURPOSE:To cool within a storing chamber with a cold heat accumulative agent and to improve a characteristics in use of a low temperature chamber in which cold air within the storing chamber is circulated by a blower. CONSTITUTION:There is provided a cold heat accumulation agent 7 for use in cooling an interior of a storing chamber 6 constructed within a thermal insulating box 4. There is also provided a blower 13 for circulating cold air cooled with latent heat of melting of the cold heat accumulation agent 7 within the storing chamber 6. A solar cell 15 is arranged at an outer surface of the thermal insulating box 4. The blower 13 is driven under utilization of the electrical power outputted by the solar cell 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low temperature chamber for cooling a storage chamber with a cold storage agent.

[0002]

2. Description of the Related Art Conventionally, this type of low temperature storage is shown as a refrigerator used in a low temperature article transportation system disclosed in, for example, Japanese Patent Laid-Open No. 3-70962 (F25D11 / 00). That is, in such a physical distribution system, since an AC power source cannot be used during transportation of the low temperature warehouse, a storage battery is mounted in the low temperature warehouse, and a storage room for storing low temperature articles and a cold storage agent are provided in the heat insulating box of the low temperature warehouse. The cold air cooled by the latent heat of fusion of the cold storage agent is circulated in the freezing chamber by a direct current (DC) blower supplied from a storage battery to be cooled.

Since the above regenerator is used in a frozen state, in the above publication, a refrigerating cycle composed of an electric compressor, an evaporator and the like is mounted in a low temperature warehouse, and it is installed in a place where an AC power source such as a delivery base is provided. A method is adopted in which the electric compressor is driven to freeze the regenerator by an evaporator, and then the cold storage is placed on a truck away from the AC power supply. In this case, a charger for rectifying the connected AC power source is provided in the low temperature compartment, and the storage battery is charged by this charger while the cold storage agent is being frozen.

Further, in recent years, there is a tendency that the refrigeration cycle is removed from the low-temperature storage to simplify the structure of the low-temperature storage to make it easy to transport and to reduce the cost. In that case, the cold storage agent is used as a delivery base. A method is adopted in which after freezing separately in a certain freezer or the like, it is loaded into a low temperature freezer.

[0005]

In order to uniformly cool the inside of the storage chamber by the latent heat of fusion of the regenerator in any of the above structures, cool air is forcedly circulated in the storage chamber by the blower during transportation of the cold storage. That is an essential condition. Therefore, a storage battery for operating the blower is indispensable, but there is a problem that the weight of the cold storage increases by the amount of the storage battery and the handling becomes difficult.

Further, even when the storage battery is provided, the discharge time of the storage battery is limited, and when the storage battery is transported for a long time, the storage battery is completely discharged and the blower stops. In order to solve this, it is sufficient to increase the capacity of the storage battery, but the usability deteriorates because the weight of the low temperature chamber further increases and handling becomes difficult, and the standby time for preparing for charging becomes long. There was a problem to do.

The present invention has been made to solve the above-mentioned conventional technical problems, and improves the usability of a low-temperature chamber in which the storage chamber is cooled by a regenerator and the cool air in the storage chamber is circulated by a blower. The purpose is to let.

[0008]

That is, a low temperature cabinet 1 according to the invention of claim 1 has a storage chamber 6 formed in an adiabatic box body 4, and a cold storage agent 7 for cooling the storage chamber 6. This cold storage agent 7
And a blower 13 that circulates the cold air cooled by the latent heat of fusion in the storage chamber 6, the solar cell 15 is provided on the outer surface of the heat insulating box 4, and the power output by the solar cell 15 is used. Then, the blower 13 is driven.

Further, in the low temperature warehouse 1 of the second aspect of the present invention, the storage chamber 6 formed in the heat insulating box 4, the cool storage agent 7 for cooling the storage chamber 6, and the melting of the cool storage agent 7 are provided. A blower 13 for circulating cold air cooled by latent heat in the storage chamber 6,
A storage battery 16 for operating the blower 13 is provided. The solar battery 15 is provided on the outer surface of the heat insulating box 4, and the output of the solar battery 15 is connected to the storage battery 16.

[0010]

According to the cold storage 1 of the invention of claim 1, since the blower 13 is driven by using the electric power output from the solar cell 15 provided on the outer surface of the heat insulating box 4, the storage battery can be eliminated. As a result, it is possible to reduce the weight of the low temperature storage 1 and eliminate the charging time, which contributes to energy saving. In particular,
During the daytime when the load on the cold storage 1 is the largest and during direct sunlight during the day, the electric power output from the solar cell 15 is maximized and the cold air is circulated in the storage chamber 6, so that the storage chamber 6 can be smoothly circulated. And it becomes possible to cool uniformly.

Further, according to the low temperature warehouse 1 of the invention of claim 2, since the output of the solar cell 15 provided on the outer surface of the heat insulating box 4 is connected to the storage battery 16, the discharge time of the storage battery 16 can be extended. As a result, it becomes possible to extend the operating time of the blower 13 and save energy while eliminating the increase in weight of the low temperature cabinet 1 due to the expansion of the capacity of the storage battery 16. In particular, since the electric power output from the solar cell 15 is maximized during the time of direct sunlight during the day when the load on the cold storage 1 is the largest, the storage chamber 6 can be cooled smoothly and uniformly. Like

[0012]

Embodiments will now be described in detail with reference to the drawings. FIG. 1 is a vertical side view of a low temperature refrigerator 1 of the present invention, FIG. 2 is a front perspective view of the low temperature refrigerator 1, FIG. 3 is a rear perspective view of the low temperature refrigerator 1, and FIG. 4 is an electric circuit diagram of the low temperature refrigerator 1. In the examples, the low temperature storage 1
Is a so-called cold roll box, which is equipped with a storage battery 16 and is loaded on a delivery vehicle such as a truck to be transported to a destination, and is capable of cooling stored items during transportation. An example of a low temperature warehouse will be described.

In FIGS. 1 to 3, a cold storage 1 is provided with wheels 2 for movement at the bottom thereof, a heat insulating box 4 having an opening at the front, and a heat insulating door 5 for opening and closing the opening. It consists of and. A storage chamber 6 for storing low-temperature products such as fresh foods and a cooling chamber 8 in which a cool storage agent 7 is arranged are defined by a partition plate 9 in the heat insulating box 4. The cold storage agent 7 is used by using the low-temperature chamber 1 and then removing the melted one, which is separately frozen and placed in the delivery base or the like before being used again and placed in the cooling chamber 8.

A cold air suction port 11 is formed in the front portion of the partition plate 9 to connect the upper storage chamber 6 and the lower cooling chamber 8 to each other, and the rear end of the partition plate 9 has a back of the heat insulating box 4. A cold air blowing duct 12 is formed which extends upward with a space from the wall and whose lower end communicates with the rear portion of the cooling chamber 8. A direct current (DC) blower 13 is arranged at the upper end of the cold air blowout duct 12, and when the blower 13 is operated, the cool air in the cooling chamber 8 cooled by the latent heat of fusion of the cold storage agent 7 blows out cold air. After being sucked up through the duct 12 and discharged into the storage chamber 6 from above, the inside of the storage chamber 6 is circulated and cooled, and then a cold air circulation is formed that returns from the cold air suction port 11 into the cooling chamber 8.

On the other hand, on the top surface of the heat insulating box 4 which is the outer surface of the cold storage 1, a solar cell 15 composed of a solar cell array is provided.
Is installed over the entire surface. The solar cell 15 generates electric power in the state where sunlight (light such as a fluorescent lamp may be used) is radiated to generate a predetermined DC power.

Next, in FIG. 4, reference numeral 16 denotes a storage battery which is attached to a machine room (not shown) of the low temperature chamber 1, a bottom surface of the heat insulating box 4, or the like. The storage battery 16 is composed of, for example, a lead storage battery that can be charged and discharged, and an output terminal 19 of the solar cell 15 is connected to a terminal 17 via a backflow prevention diode 18.
Further, the booster circuit 21 is connected to the terminal 17 of the storage battery 16, and the blower 13 is connected to the output of the booster circuit 21.

On the other hand, a rectifier circuit 24 is connected to an outlet 22 attached to the cold storage 1 via a solid state relay 23, and the output of the rectifier circuit 24 is connected to a terminal of the storage battery 16 via a current limiting resistor 26. It is connected to 17. 27 is a voltage monitoring circuit composed of a flip-flop, the input of which is the terminal 17 of the storage battery 16.
And the voltage of the LBO terminal of the booster circuit 21 is input, and the output thereof is connected to the gate of the solid state relay 23.

Next, the operation will be described. Now, it is assumed that the storage battery 16 is not charged, and in that state, the outlet 22 of the cold storage 1 is connected to the commercial AC power supply in the delivery base. At this time, the LBO terminal of the booster circuit 21 is at the “L” potential, so the voltage monitoring circuit 27 triggers the gate of the solid-state relay 23 to make it conductive. As a result, AC power is supplied to the rectifier circuit 24, so the rectifier circuit 24 rectifies this AC voltage and outputs a DC voltage, which is applied to the terminal 17 of the storage battery 16 via the resistor 26. As a result, the charging of the storage battery 16 is started and the DC voltage is also supplied to the booster circuit 21. The booster circuit 21 boosts the voltage at the terminal 17 to, for example, about 12 V and applies it to the blower 13. Therefore, the blower 1
3 starts driving.

When the charging of the storage battery 16 progresses and the fully charged state is reached and the voltage of the terminal 17 rises to a predetermined voltage,
The voltage monitoring circuit 27 makes the solid-state relay 23 non-conductive, cuts off the AC power supply, and finishes charging the storage battery 16. When the frozen regenerator 7 is installed in the cooling chamber 8, the cool air cooled by the latent heat of fusion of the regenerator 7 is circulated in the storage chamber 6 as described above by the rotation of the blower 13 and cooled to a predetermined temperature. Will be done.

After that, low temperature articles such as fresh foods are stored in the storage room 6 of the low temperature cabinet 1, the outlet 22 is disconnected from the AC power source, and the low temperature cabinet 1 is loaded on the bed of the delivery vehicle or the like to start transportation. However, during this transportation, the terminal 17 of the storage battery 16 is
The booster circuit 21 boosts the voltage discharged from the blower 1
3 is operated to circulate cold air in the storage chamber 6 as described above.

Further, during the daytime, since the solar cell 15 on the top surface of the heat insulating box 4 is exposed to direct sunlight, the solar cell 15
Power generation is started. At this time, since the output terminal 19 of the solar cell 15 is connected to the terminal 17 of the storage battery 16,
The DC power generated by the solar cell 15 is applied to the storage battery 16 and the booster circuit 21. As a result, the storage battery 16
Is charged and the amount of discharge is reduced, the storage battery 1
Therefore, the discharge time of 6 is extended, and therefore, even if the storage battery 16 having the same capacity as the conventional one is used, the blower 13 can be operated for a long time. In particular, since the electric power generated by the solar cell 15 is maximized when direct sunlight is exposed during the day when the load on the cold storage 1 is the largest, the blower 13 is reliably operated at such a heavy load, and the storage room 6 The inside can be cooled smoothly and uniformly.

Further, since the solar cell 15 is connected to the terminal 17 through the backflow prevention diode 18, the storage battery 1
6 or the output of the rectifying circuit 24 is not applied to the solar cell 15, whereby the protection of the solar cell 15 is achieved. Furthermore, while the storage battery 16 is being charged by the AC power supply in the delivery base or the like, the solar cell 1
If sunlight is applied to the storage battery 5, the storage battery 16 can be charged by the DC power generated by the solar battery 15.
The standby time required for charging 6 is shortened and energy is saved.

The power generation of the solar cell 15 ends at night, but in this case as well, the discharge time of the storage cell 16 is extended as described above, so that the storage cell 16 is discharged even after the power generation of the solar cell 15 is stopped. The blower 13 is driven by
There is no problem.

Further, in the embodiment, the low temperature cabinet 1 provided with the storage battery 16 is taken as an example, but the storage battery 16 and the rectifier circuit 2 are used.
It is also possible to eliminate 4 and the like and directly operate the blower 13 only with the electric power generated by the solar cell 15. In that case, the cold air is circulated in the storage room 6 only during the time when sunlight is shining, but since the storage battery 16 can be removed, the weight of the cold storage 1 can be remarkably reduced, and Since the application of the AC power supply can be eliminated, the standby time required for charging can be eliminated and energy can be saved. In particular, since the electric power generated by the solar cell 15 is maximized when direct sunlight is exposed during the day when the load on the cold storage 1 is the largest, the blower 13 is reliably operated at such a heavy load, and the storage room 6 The inside can be cooled smoothly and uniformly.

[0025]

As described in detail above, according to the invention of claim 1, since the blower is driven by using the electric power output from the solar cell provided on the outer surface of the heat insulating box, the storage battery can be eliminated. Therefore, it is possible to improve the usability by reducing the weight of the cold storage and eliminating the waiting time required for charging, and also contributing to energy saving. In particular, during the time of direct sunlight during the day when the load of the cold storage is the largest, the electric power output from the solar cells is maximized and the cool air is circulated in the storage room, so the storage room is cooled smoothly and uniformly. It is possible to do.

Further, according to the invention of claim 2, since the output of the solar cell provided on the outer surface of the heat insulation box is connected to the storage battery, the discharge time of the storage battery can be extended, and the capacity of the storage battery can be extended. It is possible to eliminate the increase in weight of the cold storage due to expansion and improve usability, while extending the operating time of the blower and saving energy. Especially during the time of direct sunlight during the day when the load on the cold storage is the largest,
Since the electric power output from the solar cell is maximized, the storage chamber can be cooled smoothly and uniformly.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a low temperature refrigerator of the present invention.

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

FIG. 3 is a rear perspective view of the cold storage.

FIG. 4 is an electric circuit diagram of a low temperature storage.

[Explanation of symbols]

 1 Low Temperature Chamber 4 Insulation Box 6 Storage Room 7 Cooling Agent 13 Blower 15 Solar Cell 16 Storage Battery

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirokuni Tamai 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (2)

[Claims] 1. A storage chamber formed in an insulating box, a cool storage agent for cooling the storage chamber, and a blower for circulating cool air cooled by the latent heat of fusion of the cool storage agent in the storage chamber. A low temperature warehouse, wherein a solar cell is provided on the outer surface of the heat insulating box, and the blower is driven by using the electric power output from the solar cell. 2. A storage chamber formed in an insulating box, a cool storage agent for cooling the storage chamber, a blower for circulating cool air cooled by latent heat of fusion of the cool storage agent into the storage chamber, and the blower. In a low-temperature warehouse equipped with a storage battery for operating the solar cell, a solar cell is provided on the outer surface of the heat insulating box, and the output of the solar cell is connected to the storage battery.