JPS6047501B2 - Refrigerator defrosting control method - Google Patents

Description

[Detailed Description of the Invention] The present invention solves the problem of fog dispersion in a forced air-cooled refrigerator-freezer. means the ratio of time to one interval of time.

This invention relates to a defrosting control method in which defrosting is started by detecting an increase in 1 is a compressor, 2 is a cooling fan, 3 is a thermostat that operates according to temperature changes inside the refrigerator,
4 is a door switch, and 5 is a mist scattering timer motor. When the compressor 1 is operated for a certain period of time, the contacts 5a to 5b are switched to start misting.

6 is a spray heater that melts the frost on the cooler.

Reference numeral 7 is a fog removal double return thermometer that detects the temperature rise of the cooler and stops fog dispersion.

8 is a starting capacitor, and 9 is a power source.

In this control circuit, the defrosting interval is a predetermined cumulative operating time interval of the compressor 1, and mist dispersion is performed regardless of the temperature conditions around the refrigerator.

Therefore, during drying such as winter, the amount of frost on the cooler will at least defrost, which not only increases power consumption but also causes the temperature of preserved foods to rise repeatedly.
Unfavorable for food preservation.

The present invention was made to improve the above-mentioned defects, and utilizes the fact that the intermittent operation rate of the compressor changes depending on the amount of frost, and detects an increase in the operation rate to start misting. This is what I did. To explain the present invention using an embodiment shown in FIG. 2, 1 compressor, 2 fan motor, 3 thermostat, 6 mist removal heater, 7 return thermometer after mist removal, 8 starting capacitor, and 9 power supply are the same as in the conventional example. be.

10 is a compressor operation time integration device, which stores the minimum value of the intermittent operation rate obtained by the operation rate calculation device 11 of the compressor 1 in the operation rate holding device 12 during the fixed compressor operation accumulated time, and After a certain period of cumulative operation time has elapsed, the intermittent operation rate calculated by the operation rate calculation device 11 is sent to the operation comparison device 13,
The one intermittent operation rate is compared with the minimum operation rate held by the operation rate holding device 12, and when this ratio exceeds a certain value, the relay 14 is activated, and the conduction between 14a and 14c is cut off and 14b is connected. 14c becomes conductive, the defrost heater 6 is energized, and defrost is performed.

When defrosting is completed and the temperature of the defrost return thermostat 7 becomes high and the contacts 14c and 14b separate, the defrost heater 6 is de-energized, and at the same time the relay 14 is reset and the contacts 14c and 1 are separated.
4a becomes conductive and returns to cooling operation. In the door switch 15, when the door is closed, 15c and 15a are conductive to perform cooling operation, but when the door is opened, 15c and 15b are conductive, and the signal is sent to the operation rate calculation device 11, which is then used several times. Regarding intermittent operation, one intermittent operation rate before and after is compared, and while the latter one intermittent operation rate is decreasing, no signal is sent to the operation rate comparison device 13, and it is determined whether the operation rates before and after are equal or the latter one is the same. When the operating rate starts to increase, the operating rate is sent as a signal to the operating rate comparing device 13, and compared with the minimum value of the operating rate holding device 12, and when this ratio is equal to or higher than a certain value, defrosting is started. When the refrigerator-freezer is to be operated for the first time, the minimum value of one intermittent operation rate during the cumulative predetermined period of compressor operation thereafter may be stored in the operation rate holding device 12.

As described in detail above, the present invention compares the minimum value of the compressor operation rate of one intermittent period during a certain period of accumulated compressor operation after defrosting with the compressor operation rate of one period after a certain period of accumulated compressor operation, This device is equipped with a control device that starts the next defrosting process when the ratio falls below a certain value. Defrosting is performed with an appropriate amount of frosting to improve the cold storage performance of preserved foods. be.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional defroster system, and FIG. 2 is a circuit diagram of a defrost system incorporating the present invention. 1...Compressor, 2...Cooling fan, 3
...Thermostat, 4 ... Door switch, 5 ... Defrost timer motor, 5a, 5b,
5c...Contact, 6...Defrost heater, 7...
... Defrost return thermostat, 8... Starting capacitor, 9... Power supply, 10... Compressor operation time integration device, 11... Operation rate calculation device, 12
... Operating rate holding device, 13... Operating rate comparison device, 14... Relay, 14a, 14b, 1
4c...Contact, 15...Door switch,
15a, 15b, 15c...Contact points.

Claims (1)

[Claims] 1. After defrosting, the minimum value of the compressor operating rate in intermittent operation during a certain cumulative compressor operating time is compared with the compressor operating rate in intermittent operation after a certain cumulative compressor operating time. In addition, compare the above minimum value with two consecutive intermittent operation rates after a certain cumulative compressor operation time and during intermittent operation after the door opening/closing operation, and compare the latter operation when the previous and subsequent operation rates increase. 1. A defrosting control method for a refrigerator, comprising: a control device that compares the ratio and starts the next defrosting operation when the ratio becomes less than a certain value. 2 When operating a refrigerator-freezer for the first time, the minimum value of the intermittent operation rate for a certain period of cumulative compressor operation after that is
2. The defrosting control method for a refrigerator according to claim 1 or 2, wherein the defrosting conditions of the previous time are stored and the next defrosting conditions are determined based on the defrosting conditions of the previous time.