KR100332740B1 - Defrosting method for refrigerator - Google Patents

Defrosting method for refrigerator Download PDF

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Publication number
KR100332740B1
KR100332740B1 KR1019940021075A KR19940021075A KR100332740B1 KR 100332740 B1 KR100332740 B1 KR 100332740B1 KR 1019940021075 A KR1019940021075 A KR 1019940021075A KR 19940021075 A KR19940021075 A KR 19940021075A KR 100332740 B1 KR100332740 B1 KR 100332740B1
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KR
South Korea
Prior art keywords
evaporator
defrosting
defrost
time
output voltage
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KR1019940021075A
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Korean (ko)
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KR960008243A (en
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정성해
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엘지전자주식회사
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Priority to KR1019940021075A priority Critical patent/KR100332740B1/en
Publication of KR960008243A publication Critical patent/KR960008243A/en
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Publication of KR100332740B1 publication Critical patent/KR100332740B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/004—Control mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/02—Detecting the presence of frost or condensate
    • F25D21/025—Detecting the presence of frost or condensate using air pressure differential detectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/10—Sensors measuring the temperature of the evaporator

Abstract

PURPOSE: A defrosting method for a refrigerator is provided to achieve improved cooling efficiency of evaporator by determining defrost time of evaporator through the pressure difference of the evaporator and defrost ending time through the temperature sensor. CONSTITUTION: A defrosting method comprises a first step of operating a compressor and a fan motor and performing defrosting operation by the defrost time determined by the output voltage of the Wheatstone bridge; a second step of ending the defrosting operation by the defrost ending time determined by the output voltage of the temperature sensor for sensing the surface temperature of the evaporator; and a third step of performing a normal operation after elapse of a predetermined stand-by time after completion of the second step.

Description

냉장고의 제상방법How to defrost the refrigerator

본 발명은 냉장고에서 발생되는 서리를 제거하는 기술에 관한 것으로, 특히 증발기의 표면에 착상되는 성에의 량을 정확하게 측정하여 적정한 제상시작 시간을 설정할 수 있도록한 냉장고의 제상방법에 관한 것이다.The present invention relates to a technique for removing frost generated in a refrigerator, and more particularly, to a method for defrosting a refrigerator in which an appropriate defrosting start time can be set by accurately measuring an amount of frost formed on a surface of an evaporator.

제1도는 일반적인 냉장고의 제상 개략도로서 이에 도시한 바와 같이, 냉동실 (1)내의 뒷면에 증발기(2)가 설치되고, 상기 증발기(2)에 발생되는 성에를 제거하기 위하여 증발기(2)의 일측면에 파이프 형태의 제상히터(3A)가 설치되며, 증발기(2)의 하부에는 판 형태의 제상히터(3B)가 설치되고, 그 증발기(2)에서 발생되는 냉기를 순환시키기 위해 바람을 생성하는 냉각팬(4)이 증발기(2)의 상단에 설치되며, 증발기(2)에 누적되는 성에의 량을 측정하기 위한 온도센서(3C)가 그 증발기(2)의 일측 표면에 설치된 것으로, 이와 같이 구성된 냉장고의 제상방법을 제2도를 참조하여 설명하면 다음과 같다.FIG. 1 is a schematic diagram of a defrost of a general refrigerator, and as shown therein, an evaporator 2 is installed on a rear surface of a freezer compartment 1 and one side of the evaporator 2 to remove frost generated in the evaporator 2. A defrost heater 3A in the form of a pipe is installed in the pipe, and a defrost heater 3B in the form of a plate is installed in the lower part of the evaporator 2, and cooling to generate wind to circulate the cold air generated in the evaporator 2. The fan 4 is installed on the top of the evaporator 2, and a temperature sensor 3C for measuring the amount of frost accumulated in the evaporator 2 is installed on one surface of the evaporator 2, The defrosting method of the refrigerator will be described with reference to FIG. 2.

냉장고의 콤프레셔가 구동되어 증발기(2)를 통해 냉기가 발생되고, 이렇게 발생된 냉기가 냉각팬(4)에서 발생되는 바람에 의하여 냉동실 및 냉장실에 공급되는데, 콤프레셔의 구동시간이 증가됨에 따라 증발기(2)의 표면에 누적되는 성에의 량은 증가된다.The compressor of the refrigerator is driven to generate cold air through the evaporator 2, and the generated cold air is supplied to the freezer compartment and the refrigerating compartment by the wind generated from the cooling fan 4, and as the driving time of the compressor increases, the evaporator ( The amount of frost accumulated on the surface of 2) is increased.

상기 증발기(2)의 표면에 부착되는 성에에 의해 냉각효율이 저하되므로 그 성에를 제거하기 위하여 온도센서(3C)를 이용하여 증발기(2)의 표면온도를 측정하게 되는데, 그 온도센서(3C)는 증발기(2) 표면의 온도가 일정온도 이하이면 온되고, 일정온도 이상이면 오프된다.Since the cooling efficiency is lowered by the frost attached to the surface of the evaporator 2, in order to remove the frost, the surface temperature of the evaporator 2 is measured using the temperature sensor 3C. The temperature sensor 3C Is on when the temperature of the surface of the evaporator 2 is below a certain temperature, and is off when the temperature is above a certain temperature.

따라서, 상기 온도센서(3C)의 온,오프상태를 체크하여 온상태이면제상히터(3A),(3B)를 구동시켜 그 증발기(2)에 누적된 성에가 녹기 시작하고, 이후상기 온도센서(3C)의 온,오프상태를 체크하여 오프상태이면 제상히터(3A),(3B)의 구동을 정지시키고 소정시간(T3) 동안 대기한 후 콤프레셔와 냉각팬(4)을 일정시간(T4)동안 구동시킨 후 제상동작을 종료한다.Therefore, when the on and off states of the temperature sensor 3C are checked and the defrost heaters 3A and 3B are driven, the frost accumulated in the evaporator 2 starts to melt, and then the temperature sensor ( 3C) checks the on / off state and, if it is in the off state, stops the defrost heaters 3A and 3B from driving, waits for a predetermined time T3, and then turns the compressor and cooling fan 4 on for a predetermined time T4. After driving, the defrosting operation is completed.

그러나, 이와 같은 제상방법에 있어서는 실제 증발기의 표면에 착상되는 성에의 량에 관계없이 단순히 콤프레셔의 구동시간을 근거로하여 제상동작을 실시하기 때문에 착상이 많이 진행되고 나서야 제상동작이 이루어져 냉각효율이 저하되거나, 이와 반대로 착상이 조금밖에 진행되지 않았을때 제상동작이 이루어져 냉각성능이 저하될 뿐더러 전력을 낭비하게 되는 문제점이 있었다.However, in this defrosting method, the defrosting operation is simply performed based on the compressor's driving time regardless of the amount of frost formed on the surface of the evaporator. Or, on the contrary, when the conception is only slightly progressed, defrosting is performed and the cooling performance is lowered, and there is a problem in that power is wasted.

따라서, 본 발명의 목적은 압력차 감지수단을 이용하여 보다 효율적인 제상시점을 결정하고 이를 근거로 제상을 실시할 수 있는 방법을 제공함에 있다.Accordingly, it is an object of the present invention to provide a method for determining a more efficient defrosting time point using a pressure differential sensing means and performing defrosting based on this.

상기의 목적을 달성하기 위한 본 발명의 제상방법은, 증발기의 입출력 압력을 감지하여 그에 따라 저항값을 달리하는 압력감지장치를 포함시킨 휘스톤 브리지를 구비하며, 콤프레셔와 팬모터를 구동시킨 후 상기 휘스톤브리지의 출력전압을 근거로 제상시점을 결정하여 제상동작을 실시하는 제1과정과, 제상 동작 실행후 증발기의 표면온도를 검출하는 온도센서의 출력전압을 근거로 제상완료시점을 결정하여 제상동작을 종료하는 제2과정과, 상기 제2과정 종료후 소정시간 대기시간을 갖은 후 정상운전을 실행하는 제3과정으로 이루어진다.The defrosting method of the present invention for achieving the above object is provided with a Wheatstone bridge including a pressure sensing device for detecting the input and output pressure of the evaporator and varying the resistance value accordingly, and after driving the compressor and the fan motor Defrost time is determined based on the output voltage of the Wheatstone bridge and defrosting time is determined based on the output voltage of the temperature sensor detecting the surface temperature of the evaporator after the defrosting operation is performed. A second process of terminating the operation, and a third process of performing a normal operation after a predetermined time waiting time after the end of the second process.

상기의 목적을 달성하기 위한 본 발명의 제상 검출수단은 제3도에서와 같이, 증발기(2) 공기유로 입출구의 압력을 전달하기 위한 통로를 설치하고, 그 통로의종단부를 압력감지장치(5)의 양단에 접속시키며, 그 압력감지장치(5)의 내부에는 상기 압력전달 통로를 통해 입력되는 압력(Pa),(Pb)의 차에 따라 변형되면서 저항값을 달리하는 스트레인게이지(VR)를 설치하였다.Defrost detection means of the present invention for achieving the above object is provided with a passage for transmitting the pressure of the inlet and outlet of the evaporator (2) air flow, as shown in Figure 3, the end of the passage pressure sensing device (5) Strain gauges (VR) varying in resistance value while being deformed in accordance with the difference between the pressures (Pa) and (Pb) input through the pressure transmission passages in the pressure sensing device (5). It was.

그리고, 제4도에서와 같이, 상기 스트레인게이지(VR)와 저항(R1-R3)으로 휘스톤브리지회로를 구성하여 그 증발기(2) 입출구(a),(b)의 압력차에 따라 그의 출력전압(el)이 변화되도록 하였다.Then, as shown in FIG. 4, a Wheatstone bridge circuit is formed of the strain gauge VR and the resistors R1-R3, and the output thereof according to the pressure difference between the evaporator 2 inlet and outlet a and b. The voltage el was allowed to change.

그리고, 제5도는 본 발명의 제상 제어블록도로서 이에 도시한 바와 같이, 상기 휘스톤브리지회로의 출력전압(e1)을 근거로 제상시점을 결정하여 제상히터(8)를 구동시키고, 온도센서(3C)를 통해 감지한 온도를 근거로 제상시점을 결정하는 마이크로컴퓨터(6)와, 상기 마이크로컴퓨터(6)의 제어를 받아 냉기를 발생하고 발생된 냉기를 순환시키기 위해 바람을 생성하는 콤프레셔(7) 및 냉각팬(4)으로 구성한 것으로, 이와 같이 구성한 본 발명의 작용 및 효과를 첨부한 제6도 및 제7도를 참조하여 상세히 설명하면 다음과 같다.FIG. 5 is a defrost control block diagram of the present invention, as shown therein, which determines the defrost time based on the output voltage e 1 of the Wheatstone bridge circuit to drive the defrost heater 8, and the temperature sensor. The microcomputer 6 which determines the defrosting time point based on the temperature sensed by 3C and the compressor which generates the cold air under the control of the microcomputer 6 and generates the wind to circulate the generated cold air. 7) and the cooling fan 4, which will be described in detail with reference to FIGS. 6 and 7 attached to the operation and effect of the present invention configured as described above.

냉장고를 계속하여 운전하게 되면 제6도에서와 같이 증발기(2)의 표면에 적층되는 성에의 두께 X와 증발기(2) 입,출구 양단의 압력차(△P = Pa - Pb)는 어떤 일정한 관계를 갖게 된다. 즉, △P = A + BX + CX2의 관계가 있다.If the refrigerator continues to operate, as shown in FIG. 6, the thickness X of the frost laminated on the surface of the evaporator 2 and the pressure difference (ΔP = Pa-Pb) between the inlet and the outlet of the evaporator 2 have a certain relation. Will have That is, there is a relationship of DELTA P = A + BX + CX 2 .

그리고, 상기의 압력차(△P)에 의해 압력감지장치(5)의 스트레인게이지(VR)가 변형되어 그의 저항값이 변화된다. 초기상태에서 상기 스트레인게이지(VR)의 저항값을 일정치로 유지하여 제4도와 같은 휘스톤브리지회로의 출력전압(el)은 0[V]를유지하게 되나 압력차(△P)에 의해 그 스트레인게이지(VR)가 변형되면 그의 저항값이 변화되어 출력전압(e1)이 그에 상응된 레벨로 출력된다.The strain gauge VR of the pressure sensing device 5 is deformed by the pressure difference DELTA P, and the resistance thereof is changed. In the initial state, the output voltages (e l) of the Wheatstone bridge circuit, such as the resistance of the strain gage (VR) to help the fourth maintained at a constant value is termed maintaining the 0 [V] by a pressure difference (△ P) When the strain gauge VR is deformed, its resistance is changed so that the output voltage e 1 is output at a corresponding level.

즉,X ∝ △P ∝ ε ∝ △VR ∝ e 1 의관계가 성립하며 여기서 △P는 Pa와 Pb의 압력차, ε는 스트레인게이지의 변형정도, △VR은 스트레인게이지의 변화된 저항값, e1는 휘스톤브리지의 출력전압이다.That is, X ∝ ΔP ∝ ε ∝ ΔVR ∝ e 1 , where ΔP is the pressure difference between Pa and Pb, ε is the strain gauge strain, ΔVR is the strain resistance of the strain gauge, e 1 Is the output voltage of the Wheatstone Bridge.

이와같은 관계에 의하여 증발기(2)의 표면에 적층된 성에의 량이 증가됨에 따라 휘스톤브리지의 출력전압(e1)도 점차 증가되고, 마이크로컴퓨터(6)는 그 출력전압(el)을 스캔하여 일정레벨 이상(e1≥e10)이 되면 제상히터(8)를 구동시켜 제상동작을 실시하게 된다.With this relationship, as the amount of frost laminated on the surface of the evaporator 2 increases, the output voltage e 1 of the Wheatstone bridge also gradually increases, and the microcomputer 6 scans the output voltage e l . When the predetermined level or more (e 1 ≥ e 10 ), the defrost heater 8 is driven to perform the defrosting operation.

일단 상기의 과정을 통해 제상동작이 실시되면 상기 압력감지장치(5)가 작동되지 않으므로 온도센서(3C)를 통해 증발기(2) 표면의 온도를 검출하게 되고, 이의 출력전압(e2)이 일정레벨 이상(e2≥e20)이 될때 상기 제상히터(8)의 구동을 정지시켜제상동작을 완료하게 된다.Once the defrosting operation is performed through the above process, since the pressure sensing device 5 is not operated, the temperature of the surface of the evaporator 2 is detected through the temperature sensor 3C, and its output voltage e 2 is constant. When the level is higher than (e 2 ≧ e 20 ), the defrosting heater 8 is stopped to complete the defrosting operation.

상기의 제상동작 완료후 곧바로 정상운전을 실행하지 않고 소정시간(T3)이 경과된 후 정상운전을 실행하게 되는데, 왜냐하면 제상히터(8)에 의해 증발기(2)의 내부온도가 증가되어 콤프레셔(7)의 재기동에 문제가 발생되므로 이를 방지하기 위하여 증발기(2)의 압력이 소정레벨 이하로 저하될때까지 즉 T3시간 동안 대기한 후 정상운전을 실행하게 된다.After the defrosting operation is completed, the normal operation is performed after a predetermined time T 3 has elapsed without executing the normal operation, because the internal temperature of the evaporator 2 is increased by the defrost heater 8 and the compressor ( In order to prevent this problem, a restart occurs in 7). In order to prevent this, a normal operation is performed after waiting for T 3 hours until the pressure of the evaporator 2 drops below a predetermined level.

이상에서 상세히 설명한 바와 같이 본 발명은 증발기의 입출력 압력차를 이용하여 증발기의 제상시점을 결정하고 온도감지수단을 이용하여 제상완료시점을 결정함으로써 적기에 제상동작이 이루어져 증발기의 냉각효율을 향상시킬 수 있는 효과가 있다.As described in detail above, the present invention can improve the cooling efficiency of the evaporator by determining the defrosting time of the evaporator using the input / output pressure difference of the evaporator and determining the completion time of defrosting by using the temperature sensing means. It has an effect.

제1도의 (가)는 일반적인 냉장고의 제상 개략도.1A is a schematic diagram of a defrost of a typical refrigerator.

(나)는 (가)에서 증발기의 상세도.(B) is a detailed view of the evaporator in (a).

제2도는 일반적인 제상방법에 대한 신호 흐름도.2 is a signal flow diagram for a general defrosting method.

제3도는 본 발명의 제상방법이 적용되는 냉장고의 개략도.3 is a schematic view of a refrigerator to which the defrosting method of the present invention is applied.

제4도는 본 발명에 적용되는 휘스톤브리지회로도.4 is a Wheatstone bridge circuit applied to the present invention.

제5도는 본 발명의 제상 제어 블록도.5 is a defrost control block diagram of the present invention.

제6도는 증발기의 서리층 두께와 증발기 압력과의 관계 그래프.6 is a graph of the relationship between the frost layer thickness of the evaporator and the evaporator pressure.

제7도는 본 발명의 제상방법에 대한 신호 흐름도.7 is a signal flow diagram for the defrosting method of the present invention.

*** 도면의 주요부분에 대한 부호의 설명 ****** Explanation of symbols for main parts of drawing ***

1 : 냉동실 2 : 증발기1: freezer 2: evaporator

3C : 온도센서 4 : 냉각팬3C: temperature sensor 4: cooling fan

5 : 압력감지장치 6 : 마이크로컴퓨터5: pressure sensing device 6: microcomputer

7 : 콤프레셔 8 : 제상히터7: compressor 8: defrost heater

Claims (1)

증발기의 입출력 압력을 감지하여 그에 따라 저항값을 달리하는 압력감지 장치를 포함시킨 휘스톤브리지를 구비하여, 콤프레셔와 팬모터를 구동시킨 후 상기 휘스톤브리지의 출력전압을 근거로 제상시점을 결정하여 제상동작을 실시하는 제1과정과, 제상동작 실행후 증발기의 표면온도를 검출하는 온도센서의 출력전압을 근거로 제상완료시점을 결정하여 제상동작을 종료하는 제2과정과, 상기 제2과정 종료후 소정시간 대기시간을 갖은 후 정상운전을 실행하는 제3과정으로 이루어지는 것을 특징으로 하는 냉장고의 제상방법.A whistle bridge including a pressure sensing device that detects the input / output pressure of the evaporator and changes the resistance value accordingly, drives the compressor and the fan motor, and then determines the defrosting point based on the output voltage of the whistle bridge. A first process of performing the defrosting operation, a second process of determining the completion time of the defrosting operation based on the output voltage of the temperature sensor detecting the surface temperature of the evaporator after the defrosting operation is executed, and ending the defrosting operation; And a third process of performing a normal operation after having a waiting time for a predetermined time.
KR1019940021075A 1994-08-25 1994-08-25 Defrosting method for refrigerator KR100332740B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940021075A KR100332740B1 (en) 1994-08-25 1994-08-25 Defrosting method for refrigerator

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Application Number Priority Date Filing Date Title
KR1019940021075A KR100332740B1 (en) 1994-08-25 1994-08-25 Defrosting method for refrigerator

Publications (2)

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KR960008243A KR960008243A (en) 1996-03-22
KR100332740B1 true KR100332740B1 (en) 2002-11-16

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100652775B1 (en) * 2000-01-28 2006-12-01 주식회사 엘지이아이 Refrigerator and defrost time decision method thereof
KR101843641B1 (en) * 2016-07-19 2018-03-30 엘지전자 주식회사 Defrosting apparatus and refrigerator including the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100652775B1 (en) * 2000-01-28 2006-12-01 주식회사 엘지이아이 Refrigerator and defrost time decision method thereof
KR101843641B1 (en) * 2016-07-19 2018-03-30 엘지전자 주식회사 Defrosting apparatus and refrigerator including the same

Also Published As

Publication number Publication date
KR960008243A (en) 1996-03-22

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