JPH04187962A - Cold accumulating heat insulator - Google Patents

Abstract

PURPOSE:To catch usable time of a heat insulator to enable the heat insulator efficiently by a method wherein, during heat insulation, a remaining cooling volume of a cold accumulator is detected by a remaining cooling volume determining means based on a signal from a plurality of temperature detecting parts and detection values are displayed. CONSTITUTION:After power source is drawn off, a heat insulating room 33 is heat insulated with melting latent heat of a cold accumulator 28 by circulating cooled air by a ventilation fan 30. The cold accumulator 28 melts from an upstream side to a downstream side with respect to a cold air flowing direction and temperatures of temperature detecting parts 53, 54 and 55 rise up in this order. A remaining cooling volume determining means 56 compares signals from the temperature detecting means 53 to 55 with an arbitrarily set temperature only when it is known from a signal from a power source supply determining means 43 that commercial power source is OFF, determines a remaining volume time, and catches a remaining cooling volume time by a remaining cooling volume display means 57 by pushing a remaining volume switch 58.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cold storage type refrigerator that uses a cold storage agent to keep the inside of the refrigerator cold and is used for transporting products that require refrigeration or freezing, such as fresh foods and medicines. It is.

As a conventional cold storage type cold storage box, as shown in Japanese Patent Application Laid-Open No. 1-234778, a small size cold storage type cold storage box has been used for delivery by truck or the like in the distribution of fresh foods.

An example of the above-mentioned conventional cold storage type cold storage box will be described below with reference to the drawings.

FIG. 4 is a longitudinal sectional view showing the structure of a conventional cold storage type cold storage box, and FIG. 5 is an electric circuit diagram. In FIGS. 4 and 5, reference numeral 1 denotes a cold storage box body, which is composed of a cabinet 2 containing a heat insulating material, a door 3, and a gasket 11 for sealing the door 3 and the cabinet 2 together. 10 is a caster attached to the bottom of the refrigerator main body 1. Reference numeral 12 denotes a cold storage chamber, and there is a cold storage chamber 13 at the bottom of the cold storage chamber 12, which is composed of a cold storage type heat exchanger 8 consisting of a cold storage agent and a refrigerant evaporation tube, and a blower 9. Further, a condensing unit 4 is attached to the lower surface of the bottom plate of the cold storage main body 1.

The condensing unit 4 is provided with a compressor 7 in addition to a condenser 5 and a condenser fan motor 6. The compressor 7, the condenser 5, the capillary (not shown), and the refrigerant evaporation tube constitute a refrigerant circulation type cooling unit. 14 is a commercial power supply, 15 is a main switch, 16 is a cold storage sensing thermostat, 22 is a charger, 17
1 is a cold storage room temperature regulator (thermostat), and 19 is a changeover switch for operating the blower 9. 20 is a relay that connects the charger 22 and the storage battery 21 only when the commercial power source 14 is turned on, and the storage battery 21 is a power source that operates the blower fan 9.

The operation of the cold storage type refrigerator constructed as described above will be explained with reference to FIGS. 4 and 5.

First, for cold storage operation, turn on the commercial power supply 14, and turn on the main switch 1.
5 is turned on, the refrigerant circulation type cooling unit (including the compressor 7, condenser 5, condenser fan motor 6, etc.) is operated via the cold storage sensing thermostat 16 that senses the cold storage in the cold storage type heat exchanger 8, and operates at a predetermined level. The compressor 7 is repeatedly operated and stopped depending on the temperature, and the cold storage temperature of the cold storage type heat exchanger 8 is controlled within a certain temperature range. In addition, the charger 22 and relay 20 are operated by the commercial power supply 14,
Due to the operation of the relay 20, the storage battery 21 is charged via the charger 22.
energized and charged. The storage battery 21 is connected to the cold storage room temperature controller 1
7 and a changeover switch 19 (cool storage when closed, dedicated for cold storage when oven, or non-cooling) to the blower 9.

Next, in the cold storage operation, after the cold storage type heat exchanger 8 completes cold storage,
By turning on the changeover switch 19, the storage battery 21
The blower 9 is used as a power source to control the inside of the cold storage room 12 to an arbitrary set temperature by the cold storage room temperature controller 17.
Turn ON10FF. Then, the cooled transport goods such as fresh foods brought from production areas etc. are stored in the cold storage room 1.
2, the commercial power source 14 is removed and the operation of the compressor 7 is stopped. Then, it is loaded onto a transport truck or the like and transported to the destination. At this time, the inside of the cold storage chamber 12 is cooled by the cold storage chamber 13 which is cooled by the latent heat of fusion of the cold storage type heat exchanger 8, thereby preventing the temperature of the transported goods from rising.

Problems to be Solved by the Invention However, in the above configuration, the remaining amount of cooling of the cold storage type heat exchanger 8 cannot be determined during cold storage.

For this reason, even if a cold storage type refrigerator that has cooling capacity remaining after short-distance transportation is to be used again for short-distance transportation, the person in charge of transportation must completely freeze the cold storage type heat exchanger 8 before loading the transported items. This poses the problem of needing to be transported using electricity, which results in wasted electricity consumption.

The present invention solves the above-mentioned conventional problems. By displaying the remaining amount of cooling in the cold storage during cold storage, anyone can easily check the usable time of the cold storage, and the cold storage can be used efficiently. It provides a type cold storage.

Means for Solving the Problems In order to solve the above problems, the cold storage type cold storage box of the present invention comprises a cold storage chamber containing a cold storage agent and a cooler, and a cold storage chamber for keeping transport items such as food cold. a refrigerator main body, a heat insulating partition wall that partitions the cold storage room and the cold storage room and provides ventilation holes;
A ventilation fan that operates only when controlling the temperature of the cold storage room, a rechargeable storage battery for operating the ventilation fan, a plurality of temperature detection units installed in the direction of flow of cold air of the cold storage agent, and the cold storage agent. a remaining cooling amount determining means for determining the remaining amount of cooling; a charger for charging the rechargeable storage battery; and a power input determining means for determining whether commercial power is being input.
and means for displaying the remaining amount of cooling of the cool storage agent.

Function: With the above-described configuration, the present invention displays the remaining amount of cooling during cold storage, so the person in charge of transportation can grasp the usable time of the cold storage and use the cold storage efficiently.

EXAMPLE Hereinafter, a cold storage type refrigerator according to an example of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram showing the freezing mode, cold storage mode, and remaining cooling amount of the cold storage agent of a cold storage type refrigerator according to an embodiment of the present invention.

In FIG. 1, reference numeral 23 denotes a cold storage box body, which is composed of a cabinet 24 containing a heat insulating material, a door 25, and a gasket 26 for sealing the door 25 and the cabinet 24t. A cold storage chamber 27 is formed at the lower part of the cold storage main body 23 and is composed of a latent heat type cold storage agent 28 having a freezing point lower than the set internal temperature of the cold storage and a cooler 29 that cools and solidifies the cold storage agent 28. ing. Reference numeral 31 designates a heat insulating partition wall having heat insulating properties, reference numeral 32 indicates ventilation holes provided at two locations in the heat insulating partition wall 31, and reference numeral 30 indicates a ventilation fan located at the bottom of the cabinet 24 near one of the ventilation holes 32. It is. Reference numeral 38 denotes a cold storage room, which is partitioned by the heat insulating partition wall 31 and formed in the upper part of the cold storage main body 23. 34 is a compressor, 35 is a condenser, and 36 is a condenser fan, which are installed outside the lower insulation wall surface of the cold storage main body 23. A compressor 34, a condenser 35, and a capillary tube (not shown) are connected in series to form a refrigerator unit 37, which is connected to a cooler 29 in a cold storage chamber 27 to form a refrigeration cycle. 38 is a timer means that operates after an arbitrary time after the commercial power supply is turned off, 39 is a cooled transportation item such as fresh food brought from a production area, etc., and 40 is a power cord. Reference numeral 41 denotes an internal temperature detection section that is installed in the upper part of the cold storage chamber 33 and detects the temperature inside the cold storage chamber 33. Reference numeral 42 denotes a temperature determining means that sends out a signal when the temperature detected by the temperature detecting sections 53 to 55 becomes lower than a preset temperature T1.

43 is a power input determining means that determines whether commercial power is being applied to the cooling unit 37 by inserting the power cord 40. 44 is a compressor control means that controls the compressor 34 to be turned off at T1 and turned on at T2 based on the temperature detected by the temperature detection section 38. 45 is a charger that charges the rechargeable storage battery 46 during cold storage operation. Reference numeral 47 denotes a ventilation fan control means which receives power from the rechargeable storage battery 46 and controls the ventilation fan 30 to be turned on at T4 and turned off at T3 during cold storage operation. Reference numeral 48 denotes a charging end detection means that sends a signal when charging of the rechargeable storage battery 46 from the charger 45 is completed. Reference numeral 49 denotes a cold storage completion determining means for determining that the cold storage operation is completed based on the signals sent from the temperature determining means 42 and the charging completion detecting means 48; and 50, a cold storage for indicating that the cold storage has been completed by the cold storage completion determining means 49. Completion display means (for example, LED, neon lamp, etc.).

Reference numeral 51 denotes a cold storage foot means for indicating that the cold storage chamber 88 is being kept cold when the cold storage chamber 33 is controlled to an arbitrary set temperature. 52 is a cold storage switch that starts or stops cold storage at any time. Reference numerals 53, 54, and 55 designate temperature detecting sections installed with a predetermined heat capacity sequentially from upstream to downstream with respect to the cold air flow direction of the cool storage agent 28. The remaining cooling amount of the cool storage agent 28 is determined based on the signal 55. 57 is the remaining amount display switch 5
This is a cooling remaining amount display means that displays the remaining cooling amount of the cool storage agent 28 only when 8 is pressed.

The operation of the cold storage type refrigerator constructed as described above will be explained below with reference to FIGS. 1 to 3.

Fig. 2 shows an example of a timing chart of the freezing mode and rechargeable storage battery over-discharge prevention mode function in this embodiment, and Fig. 3 shows an example of the timing chart of the cold preservation mode and rechargeable storage battery over-discharge prevention mode function in this embodiment. This is an example of a timing chart. In the figure, A and C are the temperatures inside the cold storage chamber 33, and B and D are the temperatures of the cold storage agent 28.

First, I will explain the freeze mode function. In the cold storage operation, the power input determining means 43 detects that the power cord 40 is plugged into the power source at time to, and the compressor operating means 44 operates the compressor 34 to perform the cold storage operation. The cold storage agent 28 is then cooled by the cooled cooler 29. Cold storage agent 2
As the temperature of the cold storage agent 28 decreases, the temperature detection part 5 of the cool storage agent 28 decreases.
3-55 temperature also decreases. When the cooling further progresses and the temperature reaches T1 at time t1, it becomes lower than the set temperature of the temperature determining means 42, and a signal is sent. When the compressor control means 44 receives the signal, the compressor 34 is stopped and the cooling operation is stopped. After the cooling operation is stopped, when the temperature of the temperature detection unit 38 rises and exceeds T2 (T2 - T1 is a differential) at time t2, the compressor 34 is operated again to perform the cooling operation. In this way, the compressor 34 is ON/O.
By repeating F to F, the cool storage agent 28 is kept at a constant temperature. Also, during this cold storage operation, the rechargeable storage battery 46 is charged by the charger 45. When the rechargeable storage battery 46 is almost fully charged, a signal is sent from the charging end detection means 48. When the signals from the temperature determination means 42 and the charge end detection means 48 are both generated at time t1, the cold storage completion determination means 49 determines that the cold storage operation has ended, and the cold storage completion display means 50 indicates that the cold storage is complete. At the same time as notifying the user that the operation has been completed, a signal is sent to the ventilation fan control means 47, and the ventilation fan control means 47 controls the ventilation fan 30 to 73.
It is turned OFF at (time t3) and turned ON at T4 (time t4) to control the cold storage chamber 33 to an arbitrary set temperature, and the cold storage foot means 51 notifies the user that the cold storage is in progress. Then, the person in charge of transport puts the goods to be transported 39 into the cold storage room 33, and at time t5, disconnects the power cord 40 from the power supply, places the goods on a transport truck, etc., and transports the goods to the destination. At this time, the inside of the cold storage main body 23 is cooled by the latent heat of fusion of the cool storage agent 28 and the ventilation fan control means 47, so that the temperature of the transported goods 39 can be prevented from rising.

Also, after the power cord 40 is unplugged (time t5, tl
o) After an arbitrary time (time t6, tll after 5 hours), the load on the rechargeable storage battery 46 (ventilation fan 3
0, etc.), unnecessary operation of the ventilation fan 30 after transportation is stopped, and unnecessary discharge of the rechargeable storage battery 46 can be prevented.

Next, the cold storage mode function will be explained.

First, if the person in charge of transportation wants to quickly prepare the cold storage room 33, after plugging in the power cord 40 at time t7, by pressing the cold storage switch 52, the ventilation fan control means 47 operates in the same way as the freezing mode even while the cold storage agent 28 is being stored. The temperature inside the cold storage chamber 83 is controlled to an arbitrary set temperature. Furthermore, even if the person in charge of transportation wishes to cancel the cold storage operation, he or she presses the cold storage switch 52 again at time t8 to stop the cold storage operation, thereby canceling the temperature control of the cold storage chamber 33. If the user wants to keep the cold cold again, the cold keep switch 52 is pressed again at time t9.

Next, the function of displaying the remaining cooling amount of the cool storage agent 28 will be explained.

After the commercial power supply is disconnected, cold air is circulated in the cold storage chamber 33 by the ventilation fan 30, and the cold storage chamber 33 is kept cool by the latent heat of melting of the cold storage agent 28. Therefore, the cool storage agent 28 melts from the upstream side to the downstream side with respect to the flow direction of the cold air, and the temperature increases in the order of the temperature sensing part 53, the temperature sensing part 54, and the temperature sensing part 55. The remaining cooling amount time hand F356 is the power input judgment hand 1-! i! 43
Only when the commercial power is turned off by the signal , the signals from the temperature detection means 53 to 55 are compared with the arbitrarily set temperature. For example, if all the temperature detection parts 53 to 55 are lower than the set temperature, the remaining time is 5 time, and if only the temperature detection part 53 is higher than the set temperature, the remaining time is 3 hours, and the temperature detection part 55
If only the temperature is lower than the set temperature, the remaining time is determined to be 1 hour, and if all the temperatures are higher than the set temperature, the remaining time is determined to be 0 hours. Then, by pressing the remaining amount switch 58, the person in charge of transportation can grasp the remaining cooling amount time on the remaining cooling amount display means 57, and when transporting short distances, there is no need to worry about the remaining amount of cooling in the cold storage. By freezing the agent 28, it can be transported several times.

As described above, according to this embodiment, the power input determining means 43
detects that the commercial power input is ONL/
8 in the cooler 29, and after the cold storage completion determination means 49 detects the completion of the cold storage, the ventilation fan 30 is automatically operated to control the cold storage chamber 38 to an arbitrary set temperature, and the cold storage switch 52 A cold storage mode function that operates the ventilation fan 30 to control the cold storage chamber 33 to a desired set temperature even while the cold storage agent 28 is storing cold by pressing , and stops the cold storage by pressing the cold storage switch 52 again during the cold storage; When the commercial power supply input is OFF, while the ventilation fan 30 is operated and the cool room 33 is controlled to a desired set temperature, a rechargeable storage battery over-discharge prevention mode function is provided in which the load on the rechargeable storage battery 46 is turned off after an arbitrary time by the timer means 88. By being equipped with a cooling remaining amount display function that allows you to see the remaining cooling amount of the cold storage agent 28 by pressing the remaining amount switch during transportation and cold storage, when the cold storage agent 28 completes cold storage, the temperature of the cold storage chamber 33 can be automatically adjusted to any desired temperature. Since the temperature is controlled to a set temperature, transport personnel can use the cold storage type refrigerator simply by turning on the power. For example, if you want to use the cool storage type refrigerator immediately after turning on the power, you can use it in a short time by pressing the cold storage switch 52 after turning on the power. Furthermore, since the load on the rechargeable storage battery 46 is automatically turned off after the power is disconnected for an arbitrary period of time, the performance of the rechargeable storage battery 46 will not deteriorate due to human error, and it can be used for a long time.
Also, by easily knowing the amount of cooling remaining in the cold storage agent 28, the cold storage can be used efficiently.

In addition, in the embodiment, the display means 50+ 51+ 57 may be not only a display such as a lamp or an LED, but also any means for notifying an alarm or the like within the scope of the present invention.

Effects of the Invention As described above, the present invention has a cold storage main body that is composed of a cold storage chamber that houses a cold storage agent and a cooler, and a cold storage chamber that keeps transported items such as food cool, and a system that partitions the cold storage chamber and the cold storage chamber. an insulating partition wall in which ventilation holes are arranged; a ventilation fan that operates only when controlling the temperature of the cold storage room; a rechargeable storage battery for operating the ventilation fan; An installed temperature detection unit, a remaining cooling amount determining means for determining the remaining cooling amount of the cool storage agent, a charger for charging the rechargeable battery, and a power input for determining whether commercial power is being input. and a remaining cooling amount displaying means for displaying the remaining cooling amount of the cold storage agent, and the remaining cooling amount determining means determines the remaining cooling amount of the cold storage agent based on the signals from the plurality of temperature detection units during cold storage. Since the system detects and displays the remaining amount of cooling in the cold storage agent during cold storage, the person in charge of transportation can grasp the usable time of the cold storage and use the cold storage efficiently.

[Brief explanation of the drawing]

Fig. 1 is a functional block diagram showing the freezing mode, cold storage mode, and remaining cooling amount of the cold storage agent of the cold storage type refrigerator according to the embodiment of the present invention, and Fig. 2 shows the freezing mode and rechargeable type of the cold storage type refrigerator shown in Fig. 1. Fig. 3 is a timing chart of the storage battery over-discharge prevention mode function, Fig. 3 is a timing chart of the cold storage mode and rechargeable storage battery over-discharge prevention mode function of the cold storage shown in Fig. 1, and Fig. 4 is the structure of a conventional cold storage type cold storage. A vertical cross-sectional view showing
FIG. 5 is an electrical circuit diagram of a conventional cold storage type refrigerator. 23...Cold box main body, 27...Cool storage chamber, 28...
Cold storage agent, 29... Cooler, 30... Ventilation fan, 3
DESCRIPTION OF SYMBOLS 1... Heat insulation partition wall, 32... Ventilation hole, 48... Power input determination means, 45... Charger, 46... Rechargeable storage battery, 48... Charging end detection means, 53, 54.5
5...Temperature detection section, 56...Remaining cooling amount determination means, 5
7... Remaining cooling amount display means.

Claims (1)

[Claims] A cold storage body consisting of a cold storage chamber containing a cold storage agent and a cooler, and a cold storage chamber for keeping transported items such as food cold; and an insulating partition wall that partitions the cold storage chamber and the cold storage chamber and is provided with ventilation holes. , a ventilation fan that operates only when controlling the temperature of the cold storage room;
A rechargeable storage battery for operating the ventilation fan, a plurality of temperature detection units installed in a direction in which cold air of the cool storage agent flows, and a cooling remaining amount determining means for determining the remaining amount of cooling of the cold storage agent. and a charger for charging the rechargeable storage battery,
A power supply input determining means for determining whether commercial power is being input, and a remaining amount display means for the amount of cooling of the cold storage agent, wherein the remaining amount of cooling determining means detects the signals from the plurality of temperature detection units during cold storage. A cold storage type cold storage box, characterized in that the remaining amount of cooling of the cold storage agent is detected and displayed.