JPS613976A - Defrostation controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a defrosting control device that uses an electronic pulse counter as a timer to issue a defrosting command for a refrigeration system.

Conventional structure and its problems Conventionally, the defrosting of a refrigerating device in a refrigeration system, such as a refrigerator, is based on a method in which a defrost command is issued when the operating time of the compressor reaches a predetermined time, and the defrost is performed using a heater, etc. is used.

In this defrosting method, the operating time of the compressor is set according to the maximum amount of frost formed during frequent loading and unloading of food during high outside temperatures in the summer, so it is difficult to operate at low outside temperatures such as in the winter. Sometimes, when the compressor is used in a situation where the frequency of loading and unloading of food is infrequent, the amount of frost formation may still be substantially small even when the cumulative operation time of the compressor reaches a predetermined time.

Therefore, simply defrosting periodically has the disadvantage of increasing the temperature inside the refrigerator and increasing power consumption due to wasteful defrosting, which requires defrosting even when deep defrosting is unnecessary. -ta.

Purpose of the Invention Therefore, in the present invention, by controlling the defrosting cycle according to the degree of frost formation, unnecessary defrosting is prevented,
Avoid wasting power consumption and increasing internal temperature due to defrosting.
The aim is to keep it to a minimum.

Structure of the Invention In order to achieve this object, the present invention integrates the number of pulses from the oscillator and issues a defrosting command when the pulse counter reaches a predetermined number of pulses. The inside of the cooler is configured to have a faster pulse cycle, and the pulse cycle is made faster when the absolute humidity is high, depending on the absolute humidity of the outside air.This reduces the amount of frost on the cooler. The system is designed to defrost at the appropriate time regardless of the frequency of opening and closing.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. 1st
The figure shows a defrosting control device according to an embodiment of the present invention. 0 1 is an oscillation circuit, which generates a pulse of, for example, 60 Hz. 2 is a door switch that detects opening and closing of the refrigerator door. 3 is an outside air absolute humidity detection device installed outside the refrigerator. 4 is a pulse control device, which controls the oscillation circuit 1 according to the input from the outside air absolute humidity detection device 3.
Modulates the period of the input pulse and outputs it. That is,
The basic 6° Hz pulse is increased to 100 Hz when the outside air absolute humidity is 15° C., and 200 Hz when the outside air absolute humidity is 30° C. As the outside air absolute humidity increases, the output pulse period becomes faster.

Also, when the door is not opened or closed, a basic 60Hz pulse is output. Reference numeral 6 denotes a correction input device, which outputs a signal to the pulse control device 4 using the door switch 2 as an input to cause the pulse modulation performed in the pulse control device 4 to be carried out for a certain period of time from the door closing time. 6 is the refrigerator compressor, 7
is a pulse counter that counts pulses input from the pulse control device 4 only when the compressor 6 is in operation, and outputs a defrosting command when a certain number is reached.

Reference numeral 8 denotes a defrosting heater which generates heat in response to input from the pulse counter 7.

Next, the operation status of this configuration will be explained with reference to the timing chart shown in FIG. In the figure, first, when the absolute humidity of the outside air is low, the pulse from the oscillation circuit 1 is not modulated and the pulse counter 7 is used as it is only when the compressor θ is operating. (state from 11 to 12 hours). Then, the door is opened and closed, and a certain period of time t starts from the time when the door is closed (13 hours).
The pulse of the oscillation circuit 1 is modulated by the pulse control device 4 and outputted. In this case as well, the modulated periodic pulse is the same as the basic pulse when the compressor 6 is in operation! Basic pal x a
Yoi) iHl or nahals blfi pulse counter 7
is input. The correction input device 5 inputs the door close signal from the door switch 2, and after a certain period of time has passed immediately after the door is closed, the modulation end signal is sent to the pulse control device 4.
go in and out. As a result, when the modulation end signal is input to the pulse control device 4, the pulse modulation is stopped and the basic pulse is input to the pulse counter 7 only when the compressor 6 is operating.

Further, when the absolute humidity of the outside air is high, when the compressor 6 is operating, a pulse is modulated and output to the pulse control device 4 for a certain period of time t from the time t4 when the door changes from open to closed. In this case, the basic pulse a is also short, and a pulse C having a shorter period than when the absolute humidity of the outside air is low is input to the pulse counter 7.

That is, according to the above configuration, when the absolute humidity of the outside air is high and the frequency of opening and closing of the door is high, the pulse count in the pulse counter 7 becomes faster, so the defrosting cycle is shortened, and when the frequency of opening and closing of the door is low, the count becomes slower. Since the defrosting cycle can be extended, more appropriate defrosting can be performed.

Effects of the Invention As is clear from the above explanation, the present invention controls the defrosting cycle according to the absolute humidity of the outside air and the frequency of opening and closing the door, so it is easier to defrost at an appropriate time than with conventional methods. It is possible to suppress the rise in temperature inside the refrigerator and the increase in power consumption due to wasteful defrosting.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a defrosting control device according to an embodiment of the present invention, and FIG. 1 is a timing chart diagram of FIG. 1... Oscillation circuit, 3... Outside air absolute humidity detection device, 4... Pulse control device, 5...
・Correction λ force device.

Claims (1)

[Claims] An oscillation circuit that emits pulses, an outside air absolute humidity detection device,
a pulse control device that increases the pulse period when the absolute humidity of the outside air absolute humidity detection device is high; and a correction input device that inputs pulses of the pulse period of the control device into a pulse counter for a certain period of time immediately after the door is opened or closed in response to a door opening/closing signal. A defrosting control device, comprising: a defrosting control device that issues a defrosting command based on the output of the pulse counter.