JPH02247476A - Defrosting control system of cold accumulation type cold insulation device with refrigerator - Google Patents

Abstract

PURPOSE:To shorten freezing operation time by defrosting a chiller and a cooling accumulation agent if the chiller and the cooling accumulation agent is lower than predetermined temperature upon making a power supply, actuating self-sustaining means if they exceed said predetermined temperature to freeze the cooling accumulation agent, and sustaining a device itself so as for said self-sustaining means not to be actuated once said self-sustaining means is actuated. CONSTITUTION:Once a power supply switch 19 is turned on when a chiller and a cooling accumulation agent have any frost at a temperature lower than a predetermined temperature T2, bimetals 23, 29 are switched on but with a relay 17 kept off, and a heater 8 and a defrosting/cooling fan 9 are switched on. As the chiller and the cooling accumulation agent are defrosted and the bimetals 23, 29 exceed the temperature T2 and are turned off, power supply to the heater 8 is turned off with the relay 17 turned on to start the actuation of a freezing device 26. Once the chiller and the cooling accumulation agent get low temperature, the bimetals 23, 29 are turned on, the relay 17 stays at a self-sustaining state where it keeps its on-state so as not to permit the power supply to the heater 8 to be effected. Accordingly, the freezing operation is continued. When the power switch 19 is turned on in the case where the chiller and the cooling accumulation agent are higher than the predetermined temperature T2, the operation enters the freezing operation keeping the self-sustaining state.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a long-distance truck for keeping and transporting fresh foods, medicines, and other products that must be kept at a constant temperature.

This invention relates to a defrosting control method for a cold storage type refrigerator with a refrigerator installed on a ship or the like.

A conventional defrosting control method for a cold storage refrigerator with a refrigerator includes a method in which a defrosting operation is performed depending on the presence or absence of frost formation on the cooler and the amount of frost formation.

An example of the defrosting control device for the above-mentioned conventional cold storage cold storage with refrigerator will be described with reference to the drawings.

Figure 6 is a front view of a conventional cold storage refrigerator with a refrigerator.
The figure is a vertical sectional view of a conventional cold storage box, and FIG. 7 is an electric circuit diagram of the conventional example.

In the figure, reference numeral 1 denotes the main body of the refrigerator, which is constructed as a heat-insulating box by combining heat-insulating walls. Inside, there is a luggage compartment 2 for storing food and other items, and a cold storage compartment 3 separated by insulation material, an opening/closing door 4 made of an insulation wall at the front, a machine room 6 at the bottom, and a space for transportation on the bottom. Each of the casters 6 is configured and provided with casters 6. The cold storage chamber 3 includes a cooler 7 , a defrosting heater 8 which is a defrosting device attached to the lower part of the cooler 7 , and a cooler 7 .
Pymeta A/2, a temperature sensor installed on the top of the
3, a cooling fan 9, and a cool storage agent 1 shaped like a poly pack.
o and a cooling fan 11 are arranged. The machine room 6 includes a condenser 12, a condensing fan 13, a compressor 14,
A charger 16, a battery 16, and an electrical box 18 containing a relay 17 serving as self-holding means are arranged.

On the surface of the refrigerator body 1, an outlet box 2o having a power switch 19 and an operation spring /'v22 having a cold storage thermostat 21 for controlling the temperature of the luggage compartment 2 at a constant level are arranged. Next, the construction of the electric circuit shown in FIG. 7 will be explained. 2
4 is a power outlet to input commercial power. A power switch 19 turns the entire circuit on and off. 26 is an electromagnetic contactor that turns on and off the freezing device 26, which is composed of the compressor 14, the cooling fan 9, and the condensing fan 13. Reference numeral 27 denotes a cold storage completion thermometer, and a temperature detection section (not shown) is installed at approximately the same position as the bimetal 23 of the cooler starter 7. 17 is a self-holding relay, and the normally open contact A is connected to the cold storage completion thermostat 27.
The normally closed contact B is connected to the heater 8 through the Pimetal A/23, the common terminal C is connected to the power supply, and the coil D has one end connected to the Pimetal μ23.
and the heater 8, and the other end is connected to a power source. 28 is a cooling means, which includes a charger 16 connected to a power source;
A cold storage thermo 21 and a cold storage fan 1 are connected to a battery 16 that is charged by a charger 16 and operates a cold storage fan 11.
It consists of 1.

The operation of the refrigerator-equipped cold storage refrigerator constructed as described above will be described below with reference to FIGS. 6 to 8. FIG. 8 is an operation time chart when commercial power is turned on in a conventional example. FIG. 8 (four points indicate a time chart when the power plug is plugged into a commercial power source and the power switch 19 is turned on when the temperature of the cooler T of the cold storage is lower than the predetermined temperature T2. This state is, for example, There is frost remaining in the cooler 7 due to low outside air conduction, etc., and the Pymetal 1v23 is in the on state because it is lower than the temperature T2 (for example, 10"C). At this time, the power switch 19 is turned on. When turned on, both ends of the coil A/D of the relay 17 are held at Vw+ by the contact B and the pieta metal A/23, so no voltage is applied and the coil remains off, so only the heater 8 is turned on.

Next (at one point, when the cooler 7 is defrosted by the heating of the heater 8 and the temperature of the Pymeta Iv23 exceeds T2, the Pymeta A/23 is turned off. Therefore, the power to the heater 8 is turned off, and the relay 17 A voltage is applied to both ends of the coil l'VD. At this time, the heater 8 is flowing with the current of the coil A/D, but a weak current (2 to 3 mA does not generate heat. The relay 17 When turned on, the A contact is energized and the cold storage completion thermometer 27 is set to turn on and off at a very low temperature (-3
At the ninth stage, which is on at this time, voltage is applied to the electromagnetic contactor 26 and the freezing device 26 starts operating.The temperature of the cooler 7 becomes low and the temperature T is lowered ( When it reaches 73 points, Pymeta/v23 turns on, but
Since the relay 17 is in a self-holding state in which it remains on while being held at the contact point A, the heater 8 is not energized, that is, the freezing operation continues. Next, another driving pattern will be explained. FIG. 8 (one point shows a time chart when the power switch 19 is turned on when the temperature of the cooler 7 is higher than the predetermined temperature T2).

This state indicates a state in which the temperature of the cooling chamber 3 has increased, for example, due to the opening of the door 4 after refrigerated transport.

Since the temperature of Pymetal/I/23 is 72 or higher, it is turned off, and power to the heater 8 is also turned off. Relay 17 carp/L
Since a weak current flows through the heater 8 and a voltage is applied to the DK, the relay 17 is turned on and the freezing device 26 is turned on from the contact A side as described above. After that, even if the cooler 7 is cooled down and the temperature of the Pymetal A/23 falls below T1 (as mentioned in the explanation for point 73, unless the power switch 19 is turned off, the relay 1T is self-holding, so it remains in freezing operation. When freezing is completed, the cold storage completion thermo 27 is turned off and the freezing process @26 is turned off.
Reference numeral 8 detects the temperature of the luggage compartment 2 by means of a cooling thermostat 21 and automatically turns on and off the cooling fan 11 to keep the temperature of the luggage compartment 2 constant.

Problems to be Solved by the Invention However, the above configuration only defrosts the frost that has adhered to the cooler, and does not remove the frost that has formed on the surface of the cool storage agent, which is an object to be cooled, in the same cold storage chamber. Since there is no frost, the freezing time of the essential cold storage agent becomes longer and efficient cooling and freezing cannot be achieved. Furthermore, during cold storage operation, the cold storage agent is used to store cold and radiate the amount of friend heat! Although it is intended to cool the inside of the refrigerator, the frost on the surface of the cold storage agent acts like an insulating material, hindering heat radiation and making it impossible to maintain the cold storage temperature and ensure a long cold storage time.

The present invention solves the above problems and realizes optimal defrosting operation depending on the presence or absence of frost formation on the cooler and cold storage agent and the amount of frost formation, thereby shortening the freezing time at the base and maintaining cold storage. The present invention provides a defrosting control method for a cold storage type refrigerator with a refrigerator that can lengthen the transportation time.

Means for Solving the Problems In order to solve the above problems, the defrosting control method for a cold storage type cold storage box with a refrigerator according to the present invention is such that the temperature sensor of the cooler and the temperature sensor of the cold storage agent are set to a predetermined value when the commercial power is turned on. If the temperature is below, power is applied to the defrosting device to defrost the cooler of the freezing device and the cold storage agent.
If the temperature detector is above a predetermined temperature, the self-holding means is activated to energize the freezing device and freeze the cold storage agent;
The self-holding means is designed to keep the defrosting device from operating once it is activated.

Effects With the above-described configuration, the present invention enters defrosting operation immediately after turning on the power when the temperature of the cooler and regenerator is low, that is, when the temperature is frosty, and the temperature of the cooler and regenerator is lowered to the point where the frost melts. When the temperature reaches a certain temperature, the refrigerant will start freezing operation, and from then on, defrosting operation will not be performed while the power is on. Furthermore, if the temperature of the cooler and cold storage agent has already exceeded the temperature at which frost melts when the power is turned on, freezing operation will immediately begin. Therefore, when the cold storage returned from cold storage transport is turned on at the next transport VCH station and the cold storage agent is refilled to 1:1L, defrosting is ensured in the shortest defrosting operation time according to the amount of frost in the cooler. The temperature of the cooler after defrosting is only the minimum required temperature, and the cooling efficiency is the best since freezing operation starts when there is no frost on the cooler. The operation time is shortened, and the refrigerated transport time can be extended in the freezing and refrigerated transport cycle for one day.

EXAMPLE Hereinafter, a defrosting control system for a cold storage refrigerator with a refrigerator according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a cold storage refrigerator with a refrigerator according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the refrigerator according to the embodiment, and FIG. 3 is an electric circuit diagram according to the embodiment. .

In the figure, numerals 1 to 24 and 28 are the same as those shown in one conventional example, and their explanation will be omitted. 26 is a magnetic contactor and compressor 1
4 and the condensing fan 13 are turned on and off. 26 is a freezing device composed of a condensing fan 13 and a compressor 14.

Reference numeral 27 denotes a cold storage completion thermometer, and a temperature detecting section (not shown) is installed at approximately the same position as the bimetal 1v29 of the cold storage agent 10.

29ij is a temperature sensor attached to the upper part of the cold storage agent 10.

The construction of the cold storage refrigerator with refrigerator constructed as described above will be described below with reference to FIGS. 1 to 4. FIG. 4 is an operation time chart when commercial power is turned on in this embodiment. FIG. 4 (point (a) indicates that when the temperature of the cooler 7 and the cold storage agent 1o of the cold storage in this embodiment is lower than the predetermined temperature T2, the power plug is plugged into the commercial power source and the power switch 19 is turned on. This state is 1. For example, due to low outside temperature, the cooler 7 and the cold storage agent 1 are closed.
If there is frost left on the 0, bimetal 23
and is lower than the Pimetal A/29 temperature T2 (for example, 10'C), so it is in the on state. At this time, power switch 1
When 9 is turned on, both ends of coil D of relay 17 are connected to contact B.
and Pymeta A/23. Since it is seated by the pimetal 29, it remains off regardless of the voltage, and therefore the heater 8 and the defrosting cooling fan e are turned on. Next, when the cooling WPr7 is defrosted by the heating of the heater 8 and the hot air from the defrosting cooling fan 10 at point 4, and the temperature of the Pimeta μ23 exceeds T2, the Pimeta A/29 is turned off. is turned off, and a voltage is applied across the coil lvD of the relay 17. At this time, the heater 8 is flowing by the current of the coil ND, but a weak current (2 to 3
It does not generate a fever of mA). When relay 17 turns on, A
The thermostat 27 is set to turn on and off at a very low temperature (approximately -30°C) and is on at this time, so voltage is applied to the electromagnetic contactor 26 and the freezing device 26 starts operating. Start. Cooler 7 and cold storage agent 1
The temperature of o has become low and has dropped below temperature T (when it reaches point 4, bimetal Iv23. Bimetal 29 turns on, but relay 17 is held at contact A and remains on because it is in a self-holding state. The heater 8 is not energized,
In other words, freezing operation will continue. Next, another driving pattern will be explained. Figure 4 (→ points indicate cooler 7
and a time chart when the power switch 19 is turned on when the temperature of the cool storage agent 1o is higher than the predetermined temperature T2. This state indicates a state in which the temperature of the cooling chamber 3 has increased, for example, due to the opening of the door 4 after refrigerated transport. Pimetal 1v23, Pimetal 1v29i11: They are turned off because the temperature is higher than T2, and the power to the heater 8 is also turned off. Since a weak current flows through the heater 8 and a voltage is applied to the coil A/DK of the relay 17, the relay 17 is turned on, and the freezing device 26 and the defrosting cooling fan 9 are turned on from the contact A@ as described above. . After that, the cooler 7 and the cold storage agent 1o are cooled down, and the Pymetal/L'23. Even if the temperature of the bimetal 29 falls below the temperature T, the relay 17 remains in the freezing operation unless the power switch 19 is turned off, as described above. When freezing is completed, the cold storage completion thermometer 27 is turned off, and the freezing device 26 and the defrosting cooling fan 9 are turned off. In addition, the cold storage means 28 detects the temperature of the luggage compartment 2 by the cold storage thermometer 21 and automatically
The temperature of the luggage compartment 2 is kept constant by turning on and off.

As described above, according to this embodiment, when the temperature of the bimetal 23 and the bimetal 29 is lower than the predetermined temperature T2, the heater 8 and the defrosting cooling fan 9 are energized immediately after the power is turned on, and the cooler 7 and the cold storage agent 1o are energized. Defrost and use Pymeta 1v23
．． When the temperature of Pymeta A/29 reaches the predetermined temperature 12 or higher, the heater 8 is turned off and the relay 1T is activated to switch on the freezing device 26 and the defrosting cooling fan. The cold storage agent 1o is electrified and frozen, and no defrosting operation is performed while the power is on. Also Pimetal A/23. When the temperature of the bimetal 29 exceeds the predetermined temperature T2, the relay 17 is activated immediately to energize the freezing device 26 and the defrosting cooling fan 9 to freeze the cold storage agent 10. From then on, the power is turned on. Defrosting operation will not be performed during this period.

Therefore, when the cold storage 1 that has returned from cold transport is turned on at the base in preparation for the next transport and the cold storage agent 1o is refrozen, the shortest defrosting operation time according to the amount of frost on the cooler 7 and the cold storage agent 10 is required. Can be defrosted reliably. In addition, the cooler and cold storage agent 1 after defrosting
Since the temperature at 0 is only the minimum required temperature T2, and since freezing operation starts from a state where there is no frost on the cooler 7 and the cold storage agent 10, the cooling efficiency is the best, so the freezing at the base including the defrosting time is The driving time will be further shortened, and 1
Cold storage transportation time can be extended during freezing and cold storage transportation cycles between days. Therefore, the user can realize short-time cold storage operation and long-time cold storage transportation. Furthermore, the relay 17 is self-maintaining energized using the heater 8 when the heater 8 is off, and a bimetal, Pimetal~29 is used for the temperature sensor to ensure stable contact operation regardless of the presence or absence of the power supply, so the self-maintaining energization described above is carried out. malfunctions can be avoided.

Effects of the Invention As described above, the defrosting control method of the cold storage type refrigerator with refrigerator of the present invention enables the defrosting device to be activated immediately after turning on the commercial power when the temperature detector of the cooler and the cold storage agent is lower than a predetermined temperature. Power is applied to defrost the cooler, and if the temperature detected by the temperature sensor is equal to or higher than the predetermined hot water temperature, the defrosting device is turned off and the self-holding means is activated, thereby energizing the freezing device to freeze the refrigerant and self-holding means. Once activated, the defrosting device is self-maintained so that it does not activate, so when the cold storage returned from cold transport is prepared for the next transport and the commercial power is turned on to freeze the refrigerant, Defrosting can be reliably achieved in the shortest defrosting time depending on the amount of frost on the cooler and cold storage agent. In addition, the temperature of the cooler and cold storage agent after defrosting will only reach the above-mentioned predetermined temperature, which is the minimum required temperature, and the freezing operation will start from a state where there is no frost on the cooler and cold storage agent, resulting in the best cooling efficiency. Therefore, the freezing operation time including the defrosting time is further shortened, and the cold storage transportation time can be extended in the freezing storage transportation cycle for one day. Therefore, the user can realize short-time cold storage operation and long-time cold storage transportation.

[Brief explanation of drawings]

FIG. 1 is a front view of a cold storage refrigerator with a refrigerator according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of the refrigerator according to this embodiment, and FIG. Fig. 4 is an operation time chart in this embodiment, Fig. 6 is a front view of a cold storage type refrigerator with a refrigerator in a conventional example, Fig. 6 is a longitudinal cross-sectional view of a cold storage in a conventional example, and Fig. 7 is a diagram in a conventional example. The electric circuit diagram and FIG. 8 are operation time charts in the conventional example. 1...Insulated box body, 3...Cool storage chamber, 7.
・・・・Cooler, 8・・Defrost device, 9・River・
・Defrost cooling fan, 1゜・・・Cold storage agent, 17・
Mountain...Self-holding means, 23.River...Cooler preparation detector,
26...Freezing device, 28...Cold storage means, 29...Cold storage agent temperature detector. Name of agent: Patent attorney Shigetaka Awano 1 person 1 person
Figure 5 vs. oocP-Qi Mi

Claims (1)

[Claims] (1) An insulated box with an opening/closing door for storing food and other items, a cold storage chamber configured in the box and containing a cold storage agent, and a freezing device operated by commercial power to freeze the cold storage agent. and,
A cold storage means that circulates the heat of fusion of the cold storage agent in the cold storage chamber into the box body to maintain the inside of the box body at a predetermined temperature, a defrosting device for the cooler of the freezing device, and a defrosting cooling device that blows air during defrosting and cooling. a cooler temperature sensor that detects the temperature of the cooler part of the freezing device, a cool storage agent temperature sensor that detects the temperature of the cool storage agent, and the defrosting device is turned off by the operation of both temperature sensors. and a self-holding means that energizes the freezing device, and when the commercial power is turned on, if both the temperature detectors are below a predetermined temperature, the defrosting device and the defrosting cooling fan are energized to stop the freezing device's cooler and cold storage. defrosting the refrigerant, and if the temperature sensor indicates the predetermined temperature or higher, the self-holding means is activated to energize the freezing device and the defrosting cooling fan to freeze the refrigerant, and the self-holding means is activated once. Accordingly, a defrosting control method for a cold storage type refrigerator with a refrigerator is provided, in which the defrosting device is self-maintained so as not to operate.