JP4271358B2 - Cold storage type cold storage - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cold storage type cool box that maintains the temperature of an article storage room at an appropriate temperature by a cold storage unit and a heating heater.
[0002]
[Prior art]
Conventionally, the applicant has proposed what was described in Unexamined-Japanese-Patent No. 11-108525 as a cool storage type cool box.
[0003]
This cool storage type cool box has a cool storage unit that cools the article storage room and a heating heater that prevents overcooling by the cool storage unit, and when cooling the article storage room, the cool storage agent of the cool storage unit is preliminarily cooled. In this case, the inside air is circulated through the cool storage agent to cool the inside of the compartment, and when the inside air is excessively cooled, the heating heater is energized to heat the inside air. ing.
[0004]
[Problems to be solved by the invention]
By the way, in the refrigerating type cold storage that can be kept cold between the refrigeration temperature zone of about −18 ° C. and the refrigeration temperature zone of about 3 ° C., the freezing temperature of the regenerator is about −25 ° C. When used, especially in the case where a cold storage unit is installed in the lower part of the cabinet, the temperature of the lower part of the article storage room close to the cold storage agent and the upper part of the article storage room where air heated by the heating heater is accumulated. With respect to the temperature, there is a problem that a significant temperature variation occurs, and that the freezing due to the low temperature of the lower storage article and the deterioration due to the heating of the upper storage article occur at the same time.
[0005]
In addition, it has been determined that the greatest cause of the negative temperature zone inside the refrigerator when the refrigeration temperature zone is set is that the coolness of the cold storage unit is conducted through the inner box of the article storage chamber to radiately cool the article storage chamber. As a result, even if the air in the article storage room is heated by a heating heater, the inner box wall surface is at a negative temperature, and the stored article in contact with the inner box wall surface or in close proximity to the inner box wall surface There was a problem that the stored articles that were being frozen.
[0006]
An object of the present invention is to provide a cold storage type cold storage capable of suppressing the cold heat conduction of the inner box and maintaining the interior at a desired temperature in view of the conventional problems.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that a heat insulating material is formed between an outer box and an inner box to form a cold box body, and a lower part of the cold box body is formed with a cold air inlet and Except for the cold air outlet, it is partitioned by a heat insulating partition plate, an article storage chamber for storing articles is formed above the partition plate, and a cold storage room in which a cold storage unit for keeping articles is installed is formed below the partition plate. On the other hand, in a cold storage cooler in which a heating heater for preventing excessive cooling by the cold storage unit is installed in the cold storage body, the inner box is configured to be able to conduct the cold heat of the cold storage unit to the article storage chamber, and the heating heater It has a structure in which it is placed in direct contact with the box and facing the vicinity of the partition plate .
[0008]
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 main body, and is heated by the radiant heat from the inner box. Therefore, compared with the conventional cool storage type cold storage which heats the air in a store | warehouse | chamber directly with a heating heater, the whole store | warehouse | chamber is heated uniformly and the temperature nonuniformity in a store | warehouse | chamber becomes small. In addition, since the heating heater is disposed opposite to the place where the cooling heat conduction from the frozen storage unit to the article storage room is most intense, that is, in the vicinity of the partition plate, this cooling conduction is efficiently suppressed. be able to.
[0011]
The invention of claim 2 is the regenerator type refrigerator of claim 1 , since the heating heater has a structure installed on the back surface of the inner box, the stored article does not directly contact the heating heater, The stored article will not be thermally deteriorated.
[0012]
According to a third aspect of the present invention, in the regenerator type cold storage box according to the first or second aspect, a commercial power source and a battery are provided as power sources for the heating heater, and switching means for switching the power source to the battery when the commercial power source is shut off is provided. Therefore, overcooling of the article storage room after the commercial power supply is shut off is prevented.
[0013]
Since the invention of claim 4 controls the amount of electric power to the warming heater based on the temperature detected by the temperature sensor for detecting the temperature of the article storage room in the cold storage type cold storage box of claims 1 to 3 , the temperature of the article storage room It is possible to obtain an appropriate heat generation amount corresponding to the above, and the temperature does not increase suddenly when the heat load is small as in the conventional heating heater on / off control.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show an embodiment of a cold storage type cold storage according to the present invention, FIG. 1 is a perspective view of the cold storage type cold storage, FIG. 2 is a sectional view of the cold storage type cold storage, and FIG. FIG. 4 is a drive circuit diagram of a regenerator type cool box.
[0015]
First, the use of the cold storage type cool box according to the present embodiment will be described. This cold storage cooler is used when transporting frozen or refrigerated goods by truck, etc., and these goods are stored in a cooled thermal storage cooler, and this cool storage cooler is loaded on a truck or the like. Thus, it is used in a delivery system for delivering goods to a predetermined location.
[0016]
As shown in FIGS. 1 and 2, the regenerator type cold storage used in such a home delivery system arranges an inner box 1a and an outer box 1b at a predetermined interval, and foams between the boxes 1a and 1b. It has a cold box body 1 having a rectangular parallelepiped shape filled with a heat insulating material 1c such as urethane. A machine room 2 is provided on the upper surface of the cool box body 1, and cooling equipment composed of a compressor 2 a, a condenser 2 b, a condenser fan 2 c, etc. is installed in the machine room 2, while the cool box body is provided. An opening / closing door 3 is installed on the front surface of 1.
[0017]
Further, the interior of the cool box main body 1 is divided into upper and lower parts by a heat insulating partition plate 4 and an article storage chamber 5 for storing frozen or refrigerated articles is formed above the partition plate 4 while the partition is partitioned. A cold storage room 6 is formed below the plate 4, and a cold storage unit 7 is arranged in the cold storage room 6.
[0018]
This cool storage unit 7 is formed by arranging an evaporator (pipe-like) 7b constituting a part of the cooling device in a meandering manner on the cool storage agent 7a. When the cooling device is driven, the cool storage agent 7a is cooled by the evaporator 7b. It is structured to be stored cold.
[0019]
On the other hand, the partition plate 4 has a cold air inlet 8 opened on the front side and a cold air outlet 9 opened on the rear side, and the other parts are completely partitioned vertically. A ventilation duct 10 extending toward the article storage chamber 5 communicates with the cold air outlet 9, and an internal circulation fan 11 is installed above the ventilation duct 10.
[0020]
In the cold storage type cold storage configured as described above, when the article is kept cold, first, the cooling device is driven to store the cold in the cold storage agent 7a of the cold storage unit 7. When the cold storage is completed, the cooling device is stopped, and then the door 3 is opened to store the article in the article storage chamber 5. After this article storage operation is completed, the internal circulation fan 11 is driven. By driving the internal circulation fan 11, the air in the article storage chamber 5 circulates in the order of the cold air inlet 8 → the cool storage chamber 6 → the cool storage unit 7 and cools this circulating air. This cooling air is blown in order from the cold air outlet 9 to the ventilation duct 10 to the article storage chamber 5 to keep the article storage chamber 5 cool.
[0021]
In the cool storage type cool box configured as described above, in this embodiment, the heating heater 12 configured by a linear cord heater is installed in the inner box 1a of the cool box main body 1. This installation structure will be described with reference to FIG.
[0022]
That is, the warming heater 12 is arranged at a position corresponding to the periphery of the partition plate 4 in the inner box 1 a of the cool box main body 1. Further, it is bonded to the back surface of the inner box 1a.
[0023]
Next, an electric circuit of the regenerator type cold storage according to the present embodiment will be described with reference to FIG. A battery 15 is connected to the commercial power source 13 through a charger 14, and the battery 15 is charged by power supplied from the commercial power source 13. The commercial power supply 13 is connected to a direct current power supply device 16 for converting alternating current into direct current. The power supply from the battery 15 and the DC power supply device 16 is selected by a first power supply switch 17 with a built-in relay. When the commercial power supply 13 is fed to the relay coil, the DC power supply device On the other hand, when the power supply from the commercial power supply 13 is cut off, the power of the battery 15 is supplied.
[0024]
Further, 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 the control device 19. The on / off drive of the compressor 2a is controlled based on the temperature detected by the cool storage agent temperature sensor 20 that detects the temperature of the cool storage agent 7a. When the freezing temperature of the cool storage agent 7a is used, The drive is controlled with reference to -25 ° C.
[0025]
Further, an AC heating heater 12 is connected to the commercial power supply 13 and the battery 15, and the power amount of the heating heater 12 is adjusted by a power regulator 21. The power adjuster 21 is controlled based on the temperature of the internal temperature sensor 22 that detects the temperature of the article storage chamber 5. That is, based on the internal temperature sensor 22, when the temperature in the article storage chamber 5 is lower than the set temperature, the amount of power to the heating heater 12 is increased, and when it is higher, the amount of power is decreased. The energization control to the heating heater 12 is switched to the commercial power source 13 or the power source of the battery 15 by the second power source switch 23, and when the power of the battery 15 is energized, it is switched to AC via the inverter 23. It is converted and energized.
[0026]
The internal circulation fan 11 and the condenser fan 2c are driven through the fan drive circuit 24, respectively. Here, the fan drive circuit 24 is controlled based on a control signal from the control device 19.
[0027]
According to the present embodiment, the regenerator 7a is used for both refrigeration and freezing, and the refrigerating goods are stored in the article storage chamber 5 in the regenerator type cold storage using the one having a freezing temperature of, for example, -25 ° C. Even when housed, the heater 12 is installed in direct contact with the inner box 1a, so that the heat of the heater 12 is directly conducted to the inner box 1a and is heated by radiant heat from the inner box 1a. Is done. Therefore, as compared with a conventional heat storage type cool box that directly heats the internal air by the heating heater 12, the entire article storage chamber 5 is heated uniformly, and the temperature unevenness in the internal space is reduced.
[0028]
In addition, since the heating heater 12 is installed at the place where the heat transfer from the cold storage unit 7 in the frozen state to the article storage room 5 is most intense, that is, in the vicinity of the partition plate 4, the cold storage room 6 to the article storage room. The heat conduction to 5 can be efficiently suppressed.
[0029]
Furthermore, since the heating heater 12 has a structure installed on the back surface of the inner box 1a, the stored article is not in direct contact with the heating heater 12, and the stored article is not thermally deteriorated.
[0030]
Furthermore, since the commercial power source 13 and the battery 15 are provided as the power source of the heating heater 12 and the first and second power source switchers 17 and 23 are switched to the battery 15 when the commercial power source is shut off, this occurs after the commercial power source is shut off. Excessive cooling of the article storage chamber 5 can be prevented.
[0031]
Furthermore, since the amount of electric power to the heating heater 12 is controlled based on the temperature detected by the internal temperature sensor 22 that detects the temperature inside the article storage room, an appropriate heater heating value corresponding to the article storage room temperature can be set. In addition, unlike the on / off control of the conventional heating heater, the temperature does not rise rapidly when the heat load is small.
[0032]
【The invention's effect】
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 is heated by the radiant heat from the inner box. Is uniformly heated, and the temperature unevenness in the storage is reduced. Moreover, since the heating heater is installed in the location where the cold heat conduction from the cold storage unit in the frozen state to the article storage room is most intense, the cold heat conduction can be efficiently suppressed.
[0034]
According to the second aspect of the present invention, since the heating heater is installed on the back surface of the inner box, the stored article is not in direct contact with the heating heater, and thermal deterioration of the stored article can be prevented.
[0035]
According to the invention of claim 3, 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 cut off, the overcooling of the article storage chamber that occurs after the commercial power source is shut off Can be prevented.
[0036]
According to the invention of claim 4 , it is possible to obtain an appropriate heater heat generation amount corresponding to the temperature of the article storage room, and when the heat load is small as in the conventional heating heater on / off control. There is no temperature rise.
[Brief description of the drawings]
[Fig. 1] Perspective view of a regenerator-type cool box [Fig. 2] Cross-sectional view of a regenerator-type cool box [Fig. 3] Cross-sectional view showing the main part of the present invention [Fig. Explanation】
DESCRIPTION OF SYMBOLS 1 ... Cold storage main body, 1a ... Inner box, 1b ... Outer box, 1c ... Heat insulating material, 4 ... Partition plate, 5 ... Goods storage room, 7 ... Cold storage unit, 8 ... Cold-air inlet, 9 ... Cold-air outlet, 12 DESCRIPTION OF SYMBOLS ... Warming heater, 13 ... Commercial power supply, 15 ... Battery, 19 ... Control apparatus, 21 ... Power regulator, 22 ... Inside temperature sensor.

Claims (4)

A heat insulating material is filled between the outer box and the inner box to form a cool box body, and the lower part of the cool box body is partitioned by a heat insulating partition plate excluding the cold air inlet and the cold air outlet, An article storage chamber for storing articles is formed above the plate, and a cool storage room with a cool storage unit for storing articles is formed below the partition plate , while overcooling by the cool storage unit is performed on the cool box body. In a regenerator type cold storage with a heating heater to prevent,
The inner box is configured to be able to conduct the cold heat of the cold storage unit to the article storage chamber, and the heating heater is disposed in direct contact with the inner box and facing the vicinity of the partition plate. This is a cool storage type cold storage. Cold accumulation refrigerator of claim 1 Symbol mounting the warming heater is characterized in that installed on the rear surface of the inner box. Wherein a commercial power supply and a battery as a power source for heating the heater, cold accumulation refrigerator of claim 1 or claim 2 Symbol mounting and having a switching means for switching the power to the battery when the power cut-off quotient. The regenerator-type cool box according to any one of claims 1 to 3 , wherein the amount of electric power to the heating heater is controlled based on a temperature detected by a temperature sensor that detects the temperature of the article storage room.

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