KR970047595A - Defroster of refrigerator and its control circuit - Google Patents

Abstract

The present invention relates to a defrosting apparatus and a control circuit of a refrigerator which detects a change in wind pressure of the front part of a cold air circulation fan motor to automatically control defrosting on an evaporator, and a main body and cold air at a rear portion of the main body. An evaporator disposed to generate a heat sink, a fan and a motor disposed to circulate cold air generated in the evaporator in a refrigerator, a defrost heater mounted to heat and remove the frost formed on the evaporator, and a refrigerant of the evaporator. A refrigerator having a compressor that sucks and compresses to a high temperature and high pressure, wherein the front part of the fan is configured to supply power to a defrost heater according to an operation of the wind pressure sensing means reciprocating according to the wind pressure intensity and the operation of the wind pressure sensing means. A switching means switched on / off, and in parallel with the defrost heater, the compressor and the fan, Switching means for switching the power supply to the defrost heater, Defrost start detection means for detecting the deterioration of the wind pressure due to the formation of the defrost in the furnace and generating a defrost start control signal, Detecting the end of the defrost to generate the defrost end control signal Defrost end detection means and power supply to the defrost heater in response to the defrost start control signal, the power supplied to the defrost heater in response to the defrost end control signal is cut off and the compressor and the fan after a predetermined time And driving means for driving the switching means.

Description

Defroster of refrigerator and its control circuit

Since this is an open matter, no full text was included.

2 is a circuit diagram showing an operating state of a defrosting apparatus of a conventional refrigerator,

3 is a schematic cross-sectional view showing the refrigerator as a whole adapted the defrosting apparatus of the refrigerator according to the present invention;

4 is an enlarged perspective view illustrating main parts of the refrigerator according to the present invention.

5 is a control circuit diagram of a defrost apparatus of the defrost apparatus of the refrigerator according to the present invention.

6 is a time chart comparing the defrosting operation of the defrosting apparatus of the refrigerator according to the present invention for each circuit component.

Claims (16)

A main body, an evaporator disposed to generate cold air at the rear of the main body, a fan and a motor disposed to circulate the cold air generated in the evaporator, and a heater installed to remove and remove the frost formed on the evaporator. A refrigerator comprising a defrost heater and a compressor for sucking a refrigerant of the evaporator and compressing the refrigerant to a high temperature and high pressure, wherein the front part of the fan includes a wind pressure sensing means for reciprocating according to the strength of the wind pressure, and an operation of the wind pressure sensing means. And a switching means turned on / off to supply power to the defrost heater. According to claim 1, wherein the wind pressure detecting means is a pressing member reciprocating according to the strength of the wind pressure, a plurality of guide members fixedly installed to limit or guide the position and operation of the pressing member, and one end of the pressing member A defrosting apparatus of a refrigerator, comprising: a rotating member hinged to be coupled to and interlocked and operated at the same time. The defrosting apparatus of the refrigerator of claim 2, wherein the pressing member has grooves formed at both sides of a bottom thereof so that the guide member can be inserted into a predetermined depth. The defrosting apparatus of the refrigerator of claim 2, wherein the rotation member has an insertion hole into which the guide member can be inserted. The defrosting apparatus according to claim 1, wherein the switching means includes a micro switch provided with a protruding lever to be in contact with the wind pressure sensing means and switched on / off. The defrost apparatus of the refrigerator according to claim 5, wherein the protruding lever of the micro switch is in elastic contact with the upper surface of the other side of the rotating member. The defrosting apparatus of the refrigerator of claim 5, wherein the micro switch is switched off when the tip contact portion of the protruding lever is compressed according to the operation of the pivot member. A defrost heater, switching means for switching a power supply to the defrost heater and a parallel connection of the compressor and the plate, a defrost start detection means for detecting a decrease in the wind pressure of the fan due to the formation of defrost in the oven and generating a defrost start control signal; Defrost end detection means for detecting the end of the defrost to generate a defrost end control signal, supplying power to the defrost heater in response to the defrost start control signal, and cuts off the power supplied to the defrost heater in response to the defrost end control signal, And defrosting means for driving said switching means to supply power to a compressor and a fan after a predetermined time has elapsed. The switching device of claim 8, wherein the switching means is connected to a first terminal connected to a parallel connection point between a compressor and a fan, a second terminal for supplying power to the defrost heater, and connected to the first terminal or the second terminal. A defrosting control circuit of a refrigerator, characterized by comprising a common terminal to be applied. 9. The apparatus of claim 8, wherein the defrost start detecting means comprises: a micro switch for detecting a decrease in wind of the fan due to the formation of defrost in the refrigerator, and a second timer switch for turning on / off the second timer switch depending on whether power is supplied from the micro switch. A defrost control circuit for a refrigerator, comprising two timers. The defrost control circuit of claim 10, wherein the second timer turns on the second timer switch after being delayed for a predetermined time so as to prevent an initial malfunction in which the power is supplied to the micro switch. . The defrost control circuit of claim 8, wherein the defrost end detecting unit includes a temperature switch interposed on a current supply path of the defrost heater and a first timer supplied with power through the temperature switch. . The method of claim 12, wherein the first timer maintains the first timer switch on when the power is supplied, and when the temperature switch is turned off, the power supply is cut off and the first timer switch is turned off after being delayed for a predetermined time. The regeneration control circuit of the refrigerator, characterized in that to turn on again after a certain time. The relay of claim 8, wherein the driving means is initially turned on through a second timer switch, a first relay contact point, and a first timer switch, and is supplied with power through a second terminal of the switching means to maintain a turn-on operation. Defrost control circuit of the refrigerator comprising: a. 15. The defrost control circuit of claim 14, wherein the first relay contact is turned on when the relay is turned off and turned off when the relay is turned off. 15. The relay of claim 14, wherein the relay is switched to a second relay contact so that the first terminal and the common terminal of the switching unit are connected to each other when turned off and the second terminal and the common terminal are connected to each other when the relay is turned on. Refrigerator. ※ Note: The disclosure is based on the initial application.