JP2002130902A - Cool storage type cold insulation cabinet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cool storage type cold insulation cabinet capable of maintaining a desired temperature in the cabinet by suppressing a cool conduction of an inner case. SOLUTION: The cool storage type cold insulation cabinet comprises a heat insulator 1c filled between an outer case 1b and the inner case 1a to form a cold insulation cabinet body 1, a cold storage unit 7 for cold insulating an article in the body, and a heater 12 for preventing an excess cooling by the cold storage unit 7. In this case, the heater 12 is directly contacted with the case 1a and installed. Thus, a heat of the heater 12 is directly conducted to the case 1a for constituting the body 1, and heated by a radiation heat from the case 1a. Accordingly, as compared with a conventional heat storage type heat insulation cabinet for directly heating indoor air by the heater 12, the entire indoor is uniformly heated, and a temperature unevenness in the cabinet is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative refrigerator for maintaining the temperature of an article storage room at an appropriate temperature by using a regenerative unit and a heating heater.

[0002]

2. Description of the Related Art Heretofore, as a regenerative refrigerator, the applicant has proposed a refrigerator disclosed in Japanese Patent Application Laid-Open No. 11-108525.

[0003] The regenerative cold storage is provided with a regenerative unit for cooling the article storage room and a heating heater for preventing overcooling by the regenerative unit. Is cooled in a cooling circuit, and the inside of the refrigerator is circulated through the cool storage agent to cool the inside of the refrigerator. On the other hand, when the inside of the refrigerator is excessively cooled, the inside of the refrigerator is energized by energizing a heating heater. It is heating up.

[0004]

By the way, in a regenerative refrigerator that can be switched between a refrigeration temperature zone of about -18 ° C. and a refrigeration temperature zone of about 3 ° C., the freezing temperature of the regenerator is -2.
It is about 5 ° C and when used when keeping cool in the refrigerated temperature zone,
In particular, in the case where the cool storage unit is installed in the lower part of the refrigerator, the temperature of the lower part of the article storage room close to the cold storage agent and the temperature of the upper part of the article storage chamber where the air heated by the heating heater is stored are: There will be significant temperature variations,
There is a problem that freezing of the lower storage article due to low temperature and deterioration of the upper storage article due to heating occur simultaneously.

[0005] Further, the reason why the inside of the refrigerator becomes a minus temperature zone even when the refrigerator temperature zone is set is that the maximum cooling of the cold storage unit is conducted through the inner box of the article storage room to radiatively cool the article storage room. As a result, even if the air in the article storage room is heated by the heating heater, the inner box wall surface is at a minus temperature, and the stored articles in contact with the inner box wall surface and the inner box are There was a problem that the stored articles close to the wall surface were frozen.

In view of the above-mentioned conventional problems, an object of the present invention is to provide
An object of the present invention is to provide a regenerative cold storage that can suppress cold conduction of an inner box and maintain the inside of the refrigerator at a desired temperature.

[0007]

According to the present invention, in order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a heat insulating material is filled between an outer box and an inner box to form a cool box main body, In a cold storage type cold storage box in which a cold storage unit for keeping articles cool and a heating heater for preventing excessive cooling by the cold storage unit are installed in a refrigerator main body, the heating heater is installed in direct contact with the inner box.

According to the first aspect of the invention, the heat of the heating heater is directly conducted to the inner box constituting the cool box main body, and the inner box is heated by radiant heat from the inner box. Therefore, compared with the conventional cold storage type cold storage in which the air in the refrigerator is directly heated by the heating heater, the entire refrigerator is uniformly heated, and the temperature unevenness in the refrigerator is reduced.

According to a second aspect of the present invention, in the cold storage type cold storage of the first aspect, a lower portion of the cold storage main body is partitioned by a heat insulating partition except for a cold air inlet and a cold air outlet, and an article is provided above the partition. A cold storage cool storage box in which a cold storage chamber in which a cold storage unit is installed is formed below the partition plate, and has a structure in which a heating heater is installed near the partition plate. .

According to the second aspect of the present invention, since the heating heater is installed at the location where the cold heat transfer from the frozen storage unit to the article storage room is most intense, that is, near the partition plate. Cold heat conduction can be efficiently suppressed.

According to a third aspect of the present invention, in the regenerative cold storage of the first or second aspect, since the heating heater is arranged on the back surface of the inner box, the stored articles are directly transferred to the heating heater. And the stored articles are not thermally degraded.

According to a fourth aspect of the present invention, in the regenerative cold storage of the first to third aspects, a commercial power supply and a battery are provided as power supplies for the heating heater, and a switching means for switching the power supply to the battery when the commercial power supply is cut off. Because it has a structure,
Excessive cooling of the article storage room that occurs after the commercial power supply is shut off is prevented.

According to a fifth aspect of the present invention, in the cold storage type cold storage of the first to fourth aspects, the amount of electric power to the heating heater is controlled based on the temperature detected by the temperature sensor for detecting the temperature of the article storage room. The heating value can be set to an appropriate value corresponding to the temperature of the storage room, and the temperature does not rise sharply when the heat load is small unlike the conventional on / off control of the heating heater.

[0014]

1 to 4 show an embodiment of a cold storage cool storage according to the present invention. FIG. 1 is a perspective view of the cold storage cool storage, and FIG. 2 is a cross section of the cold storage cool storage. FIG. 3 is a sectional view showing a main part of the present invention, and FIG. 4 is a drive circuit diagram of a regenerative refrigerator.

First, the use of the regenerative cold storage according to the present embodiment will be described. This regenerative cold storage is used for transporting frozen or refrigerated goods by truck, etc., and stores these articles in a regenerative cold refrigerating cold storage, and loads the refrigerating cold refrigerating refrigerator on a truck or the like. Then, it is used in a home delivery system for home delivery of articles to a predetermined location.

As shown in FIGS. 1 and 2, the cold storage refrigerator used in such a home delivery system has an inner box 1a and an outer box 1b arranged at a predetermined interval, and each box 1a, 1b The cold storage main body 1 has a rectangular parallelepiped shape filled with a heat insulating material 1c such as urethane foam. A machine room 2 is provided on the upper surface of the cool box main body 1, and a compressor 2 a is provided in the machine room 2.
While a cooling device including a condenser 2b, a condenser fan 2c, and the like is installed, an opening / closing door 3 is installed on a front surface of the cold storage main body 1.

The interior of the refrigerator main body 1 is vertically divided by a heat insulating partition plate 4 at the lower part thereof. Above the partition plate 4, an article storage chamber 5 for storing frozen or refrigerated articles is provided.
On the other hand, a cold storage chamber 6 is formed below the partition plate 4, and a cold storage unit 7 is arranged in the cold storage chamber 6.

The regenerative storage unit 7 includes a regenerative agent 7a and an evaporator (pipe-shaped) 7b constituting a part of a cooling device arranged in a meandering manner.
a is cooled by the evaporator 7b and stored.

On the other hand, the partition plate 4 has a cold air inlet 8 at its front side.
, And a cool air outlet 9 is opened on the rear side, and the other portions are completely partitioned in the upper and lower directions. This cool air outlet 9 has a ventilation duct 1 extending toward the article storage room 5.
0 communicates with each other, and an in-compartment circulation fan 11 is installed above the ventilation duct 10.

When the articles are to be kept cool in the regenerative cold storage constructed as described above, first, the cooling device is driven to store the cold in the regenerator 7a of the regenerative unit 7. When the cold storage is completed, the cooling device is stopped, and then the door 3 is opened to store the articles in the article storage chamber 5. After the article storage operation is completed, the internal circulation fan 11 is driven. The article storage chamber 5 is driven by the internal circulation fan 11.
The air inside is cool air inlet 8 → cold storage room 6 → cold storage unit 7
And circulates sequentially to cool the circulating air. This cooling air is sequentially blown to the cool air outlet 9 → the ventilation duct 10 → the article storage room 5, so that the article storage room 5 is kept cool.

In the cold storage type cold storage constructed as described above, in this embodiment, a heating heater 12 composed of a linear cord heater is installed in the inner box 1a of the cold storage main body 1. This installation structure will be described with reference to FIG.

That is, the heating heater 12 is arranged at a position corresponding to the periphery of the partition plate 4 in the inner box 1a of the cool box main body 1. Also, it is adhered to the back surface of the inner box 1a.

Next, an electric circuit of the cold storage type cold storage according to the present embodiment will be described with reference to FIG. A battery 15 is connected to the commercial power supply 13 through a charger 14.
The battery 15 is charged by power supplied from the power supply. A DC power supply 16 is connected to the commercial power supply 13 and converts an AC current into a DC current. The power supply from the battery 15 and the DC power supply 16 is selectively selected by a first power switch 17 with a built-in relay. When the commercial power 13 is supplied to the relay coil, the DC power supply When the power supply from the commercial power supply 13 is interrupted, the power from the battery 15 is supplied.

The compressor 2 a is connected to the commercial power supply 13 via an on / off switch 18, and is turned on / off based on a control signal from a control device 19. The on / off driving of the compressor 2a is controlled based on the temperature detected by the regenerator temperature sensor 20 for detecting the temperature of the regenerator 7a, and the freezing temperature of the regenerator 7a (for example, when the regenerator is used for both freezing and refrigeration, for example, -25 ° C).

Further, an AC-type heating heater 12 is connected to the commercial power supply 13 and the battery 15, and the power of the heating heater 12 is adjusted by a power regulator 21. The electric power controller 21 is controlled based on the temperature of the internal temperature sensor 22 that detects the temperature of the article storage room 5. That is, the article storage room 5 based on the inside temperature sensor 22
When the inside temperature is lower than the set temperature, the amount of power to the heating heater 12 is increased, while when it is higher, the amount of power is reduced. The power supply control to the heating heater 12 is switched to the commercial power supply 13 or the power supply of the battery 15 by the second power supply switch 23, and when the power of the battery 15 is supplied, the power is supplied to the AC through the inverter 23. It is converted and energized.

The internal circulation fan 11 and the condenser fan 2c are respectively driven through a fan drive circuit 24. Here, this fan drive circuit 24 is
9 is controlled based on the control signal.

According to the present embodiment, the cold storage agent 7a is used for both refrigeration and freezing, and in the cold storage type cold storage using a refrigerator having a freezing temperature of, for example, -25 ° C. Even when refrigerated articles are stored, since the heating heater 12 is installed in direct contact with the inner box 1a, heat of the heating heater 12 is directly conducted to the inner box 1a, and radiant heat from the inner box 1a is provided. Is heated. Therefore, compared with the conventional regenerative cold storage in which the inside air is directly heated by the heating heater 12, the entire article storage room 5 is uniformly heated,
Temperature unevenness in the refrigerator is reduced.

Further, since the heating heater 12 is installed at the place where the cold heat conduction from the cold storage unit 7 in the frozen state to the article storage room 5 is the strongest, that is, near the partition plate 4, Cold heat conduction to the article storage room 5 can be efficiently suppressed.

Furthermore, since the heating heater 12 has a structure installed on the back surface of the inner box 1a, the stored articles do not directly contact the heating heater 12 and the stored articles do not deteriorate due to heat. .

Further, since a commercial power supply 13 and a battery 15 are provided as power supplies for the heating heater 12 and first and second power supply switches 17 and 23 for switching the power supply to the battery 15 when the commercial power supply is cut off, the commercial power supply is provided. Excessive cooling of the article storage room 5 that occurs after the shutoff can be prevented.

Further, the electric energy to the heating heater 12 is
Since the control is performed based on the temperature detected by the in-compartment temperature sensor 22 for detecting the temperature of the article storage room, it is possible to set an appropriate heating value of the heater corresponding to the temperature of the article storage room. Unlike the off control, when the heat load is small, the temperature does not rise sharply.

[0032]

As described above, according to the first aspect of the present invention, the heat of the heating heater is directly conducted to the inner box constituting the cool box body, and the inner box is heated by the radiant heat from the inner box. Therefore, the entire inside of the refrigerator is heated uniformly, and the temperature unevenness in the refrigerator is reduced.

According to the second aspect of the present invention, since the heating heater is installed at the location where the cold heat conduction from the cold storage unit to the article storage room is frozen, this cold heat conduction is efficiently suppressed. can do.

According to the third aspect of the present invention, since the heating heater is installed on the back surface of the inner box, the stored articles do not come into direct contact with the heating heater, and the stored articles can be prevented from being thermally degraded. .

According to the fourth aspect of the present invention, since the commercial power source and the battery are provided as the power source of the heating heater, and the switching means for switching the power source to the battery when the commercial power source is shut off is provided,
It is possible to prevent the article storage room from being excessively cooled after the commercial power supply is shut off.

According to the fifth aspect of the present invention, it is possible to set an appropriate amount of heat generated by the heater in accordance with the temperature of the article storage room, and to control the on / off of the conventional heating heater.
The temperature does not rise sharply when the heat load is small.

[Brief description of the drawings]

FIG. 1 is a perspective view of a regenerative refrigerator.

FIG. 2 is a cross-sectional view of a regenerative refrigerator

FIG. 3 is a sectional view showing a main part of the present invention.

FIG. 4 is a drive circuit diagram of a regenerative refrigerator

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cold storage main body, 1a ... Inner box, 1b ... Outer box, 1c ... Insulation material, 4 ... Partition board, 5 ... Article storage room, 7 ... Cold storage unit,
8 cold air inlet, 9 cold air outlet, 12 heater
13 ... commercial power supply, 15 ... battery, 19 ... control device, 2
1 ... power regulator, 22 ... temperature sensor in the refrigerator.

Claims (5)

[Claims] 1. A cold storage body is formed by filling a heat insulating material between an outer box and an inner box, and a cool storage unit for cooling the articles and a cooling unit for preventing excessive cooling by the cold storage unit. A regenerative cold storage box provided with a warm heater, wherein the heating heater is installed in direct contact with the inner box. 2. A lower part of the cool box body is partitioned by a heat insulating partition plate except for a cold air inlet and a cold air outlet, and an article storage chamber for storing articles is provided above the partition plate. The cold storage cold storage according to claim 1, wherein each of the cold storage cold storages includes a cold storage chamber in which the cold storage unit is installed, and the heating heater is installed near the partition plate. Warehouse. 3. The regenerative cold storage according to claim 1, wherein the heating heater is provided on a back surface of the inner box. 4. The apparatus according to claim 1, further comprising a commercial power supply and a battery as a power supply for the heating heater, and a switching unit for switching the power supply to the battery when the commercial power supply is cut off. Item. 5. An electric power supply to the heating heater is controlled based on a temperature detected by a temperature sensor for detecting a temperature of the article storage room.
Item.