KR20010047410A - Defrosting system of refrigerator - Google Patents

Defrosting system of refrigerator Download PDF

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Publication number
KR20010047410A
KR20010047410A KR1019990051614A KR19990051614A KR20010047410A KR 20010047410 A KR20010047410 A KR 20010047410A KR 1019990051614 A KR1019990051614 A KR 1019990051614A KR 19990051614 A KR19990051614 A KR 19990051614A KR 20010047410 A KR20010047410 A KR 20010047410A
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KR
South Korea
Prior art keywords
heater
temperature
evaporator
temperature sensor
refrigerator
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KR1019990051614A
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Korean (ko)
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KR100512641B1 (en
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박상호
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구자홍
엘지전자 주식회사
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Priority to KR10-1999-0051614A priority Critical patent/KR100512641B1/en
Publication of KR20010047410A publication Critical patent/KR20010047410A/en
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Publication of KR100512641B1 publication Critical patent/KR100512641B1/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
    • F25D21/006—Defroster control with electronic control circuits
    • 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
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • 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
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/02—Refrigerators including a heater
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)

Abstract

PURPOSE: A defrosting system for high capacity refrigerator is provided to reduce power consumption by allowing each heater to be effectively controlled by temperature sensors having different limit temperatures set in accordance with operating characteristics. CONSTITUTION: A defrosting system comprises a direct heating type heater(20) performing heating operation through a conductive heat, while contacting an evaporator(10); an indirect heating type heater(22) disposed beneath the evaporator and which performs heating operation through a radiated heat; a first temperature sensor(32) positioned adjacent to the direct heating type heater and which senses the degree of temperature rise caused due to the heating operation of the direct heating type heater; a second temperature sensor(34) positioned adjacent to the indirect heating type heater and which senses the degree of temperature rise caused due to the heating operation of the indirect heating type heater; and a control circuit for controlling operation of each heater when the ambient temperature around each temperature sensor reaches the preset limit temperature.

Description

대용량 냉장고의 제상시스템{DEFROSTING SYSTEM OF REFRIGERATOR}Defrosting system of large capacity refrigerators {DEFROSTING SYSTEM OF REFRIGERATOR}

본 발명은 냉장고의 제상시스템에 관한 것으로서, 보다 상세하게는 각 히터가 별도의 온도센서를 통해 분리 제어됨으로써 냉장고의 작동효율 향상 및 냉장고에 보관된 음식물의 신선도 유지에 도움이 되는 대용량 냉장고의 제상시스템에 관한 것이다.The present invention relates to a defrosting system of a refrigerator. More specifically, each heater is separated and controlled by a separate temperature sensor, so that a defrosting system of a large-capacity refrigerator that helps improve the operating efficiency of the refrigerator and maintain the freshness of food stored in the refrigerator. It is about.

일반적으로 냉장고는 음식물 등을 냉동시키거나, 냉장보관하기 위해 사용되는 것으로서, 그 내부에 냉동실과 냉장실로 분리된 수납공간을 형성하는 케이스 및 상기 케이스의 일측에 장착되어 냉동실과 냉장실을 개폐하는 상 하 도어와, 압축기, 응축기 및 증발기 등과 같이 냉동사이클을 이루어 냉동실과 냉장실의 온도를 낮추기 위한 기기들을 포함하여 구성되어 있다.In general, a refrigerator is used for freezing food or storing food in a refrigerator, and a case for forming a storage space separated into a freezer compartment and a refrigerating compartment, and mounted on one side of the case to open and close the freezer compartment and the refrigerating compartment. It comprises a door, a device for lowering the temperature of the freezer compartment and the refrigerating chamber by forming a refrigeration cycle such as a compressor, a condenser and an evaporator.

냉장고에서는 압축기에 의해 저온 저압의 기상 냉매가 고온 고압으로 압축되고, 압축된 고온 고압의 기상 냉매가 응축기를 지나는 과정에서 냉각 응축되어 고압의 액상으로 전환되며, 고압의 액체상태로 된 냉매가 모세관을 통과하면서 그 온도와 압력이 낮아진 다음, 계속해서 증발기에서 저온 저압의 기체상태로 변하면서 주위로부터 열을 빼앗아 그 주위의 공기를 냉각시키게 된다. 증발기를 거쳐 냉각된 공기는 송풍팬의 작동으로 냉동, 냉장실로 유입 순환됨으로써 냉동실 및 냉장실의 온도가 낮아지게 된다.In the refrigerator, the low-temperature low-pressure gaseous refrigerant is compressed to high temperature and high pressure, and the compressed high-temperature high-pressure gas phase refrigerant is cooled and condensed as it passes through the condenser and converted into a high-pressure liquid phase. As it passes, its temperature and pressure are lowered, and then the evaporator continues to change into a low-temperature, low-pressure gas state, taking heat away from the surroundings to cool the air around it. The air cooled through the evaporator is circulated into the freezing and refrigerating compartment by the operation of a blower fan, thereby lowering the temperature of the freezing compartment and the refrigerating compartment.

한편, 냉장고의 작동 시에는 냉동, 냉장실의 내부에 저장된 음식물로부터 다량의 수분이 증발하고, 이러한 수분이 순환하는 냉기를 따라 증발기와 접하여 응축, 냉각됨으로써 증발기 표면에 서리층이 형성되는 착상현상이 발생하며, 이와 같은 착상현상에 의하면 증발기의 표면에서 단열작용이 이루어짐으로써 증발기의 열교환 효율이 저하된다는 문제점이 발생한다.On the other hand, during operation of the refrigerator, a large amount of water evaporates from food stored in the refrigerator and the refrigerating chamber, and condensation and cooling occurs in contact with the evaporator along with the cold air in which the moisture circulates, forming an frost layer on the surface of the evaporator. In addition, according to the above phenomenon, a problem occurs that heat exchange efficiency of the evaporator is lowered by adiabatic action on the surface of the evaporator.

따라서, 냉장고에는 증발기의 표면에 형성되는 서리층을 제거하기 위한 제상시스템이 구비되어 있는데, 이러한 제상시스템은 대개, 증발기 주위의 온도를 감지하는 온도센서와, 발열작용을 통해 증발기 주위의 온도를 높이는 히터와, 상기 온도센서를 통해 증발기 주위의 온도변화상황을 파악하여 히터의 작동을 제어하는 제어회로를 기본적인 구성요소로 하여 이루어지며, 냉장고의 종류에 따라 다양한 형태로 변형 구성된다. 이중에서 특히, 냉동실과 냉장실이 좌우로 수평배치된 사이드 바이 사이드(side by side)타입 냉장고와 같은 대용량 냉장고의 경우에는 강한 냉각작용을 위해 대형 증발기가 사용되므로, 제상시스템 역시 부피가 큰 대형 증발기에 대해 보다 효과적인 제상작용을 이룰 수 있도록 두개의 히터를 채용한 이른바 더블 히팅(double heating) 방식으로 이루어진다.Therefore, the refrigerator is provided with a defrosting system for removing the frost layer formed on the surface of the evaporator. Such a defrosting system usually includes a temperature sensor for detecting a temperature around the evaporator, and a heat generation to increase the temperature around the evaporator. The heater and the control circuit for controlling the operation of the heater by grasping the temperature change around the evaporator through the temperature sensor is made as a basic component, and is configured in various forms depending on the type of refrigerator. Especially in the case of a large-sized refrigerator such as a side by side type refrigerator in which the freezer compartment and the refrigerating chamber are horizontally arranged horizontally from side to side, a large evaporator is used for strong cooling action, so the defrost system is also used in a large bulky evaporator. It is made of a so-called double heating method employing two heaters to achieve more effective defrosting.

이와 같은 더블 히팅 방식의 대용량 냉장고용 제상시스템에는 도 1에 나타난 것과 같이 증발기(10)의 냉각핀(12)에 접하여 설치된 직접가열식 히터(20)와, 증발기(10)의 하방에 떨어져 설치된 간접가열식 히터(22), 그리고 상기 각 히터(20)(22)를 제어하기 위한 하나의 온도센서(30)가 적용되는데, 직접가열식 히터(20)로서는 주로 엘코드(L-cord)형 히터가 사용되고, 간접가열식 히터(22)로서는 쉬스(sheath)형 히터가 사용된다.Such a double heating type defrosting system for a large-capacity refrigerator has a direct heating heater 20 installed in contact with the cooling fin 12 of the evaporator 10 and an indirect heating type installed below the evaporator 10 as shown in FIG. 1. A heater 22 and one temperature sensor 30 for controlling each of the heaters 20 and 22 are applied. As the direct heating heater 20, an El-cord type heater is mainly used. As the indirect heating heater 22, a sheath type heater is used.

상기 직접가열식(엘코드형) 히터(20)는 발열온도가 60℃ 정도로서 전도열을 통해 증발기(10)를 직접 가열하고, 간접가열식(쉬스형) 히터(22)는 발열온도가 300℃ 정도로서 주로 복사열을 통해 증발기(10) 주위를 가열하게 된다.The direct heating (elcord type) heater 20 is a heat generation temperature of about 60 ℃ direct heating the evaporator 10 through the conductive heat, indirect heating (sheath type) heater 22 is a heat generation temperature of about 300 ℃ mainly radiant heat Through the evaporator 10 is heated around.

상술한 바와 같은 종래 대용량 냉장고의 제상시스템은 도 2에 나타난 것과 같이 냉장고의 냉각작동이 일정시간(t)을 초과하여 계속될 경우 제어회로가 자동으로 냉장고의 작동을 중단시킨 다음(압축기 정지), 직접가열식 히터(20) 및 간접가열식 히터(22)에 전원이 공급되도록 하여 각 히터(20)(22)에 의한 발열작용으로 증발기(20)에 직접적인 전도열 및 간접적인 복사열을 가함으로써 증발기(10)에 형성된 서리층이 제거되도록 하며, 계속되는 각 히터(20)(22)의 발열작용으로 증발기(10) 주위의 온도가 온도센서(30)에 설정된 제한온도(T)에 도달하면 역시 제어회로가 온도센서(30)를 통해 이러한 상황을 감지하여 각 히터(20)(22)의 작동을 멈추게 하는 이른바 자동 간헐방식으로 작동된다.In the defrosting system of the conventional high-capacity refrigerator as described above, as shown in FIG. 2, when the cooling operation of the refrigerator continues for a predetermined time t, the control circuit automatically stops the operation of the refrigerator (stop the compressor). Power is supplied to the direct heating heater 20 and the indirect heating heater 22 and the evaporator 10 by applying direct conduction heat and indirect radiant heat to the evaporator 20 by exothermic action by each heater 20, 22. The frost layer formed on the substrate is removed, and when the temperature around the evaporator 10 reaches the limit temperature T set in the temperature sensor 30 due to the exothermic action of each heater 20, 22, the control circuit is further heated. The sensor 30 detects such a situation and operates in a so-called automatic intermittent method to stop the operation of each heater 20, 22.

한편, 이러한 종래 대용량 냉장고의 제상시스템에 의하면 상대적으로 발열온도가 높은 간접가열식 히터(22) 근처의 증발기(10) 아래부분에서부터, 증발기(10)의 윗부분으로 제상작용이 진행되고, 각 히터(20)(22)가 공히 증발기(10)의 상측에 치우쳐 설치된 하나의 온도센서(30)에 의해 제어되기 때문에 간접가열식 히터(22)는 증발기(10) 윗부분의 서리가 제거될 때까지 불필요하게 작동을 계속하게 된다.On the other hand, according to the defrosting system of the conventional large-capacity refrigerator, the defrosting operation proceeds from the lower part of the evaporator 10 near the indirect heating heater 22 having a relatively high heat generation temperature to the upper part of the evaporator 10, and each heater 20. Since the (22) is controlled by one temperature sensor (30) installed on the upper side of the evaporator (10), the indirect heating heater (22) operates unnecessarily until the frost on the upper part of the evaporator (10) is removed. Will continue.

따라서, 온도센서(30) 주위온도가 제한온도(T)에 가까워질 무렵, 증발기(10)의 아랫부분에서는 이미 녹아내린 서리가 과열된 간접가열식 히터(22)에 의해 가열 증발됨으로써 고온의 증기가 발생하고, 증발기(10)의 윗부분에서는 서리가 미처 제거되지 않고 남아있게 되는데, 증발기(10)의 아랫부분에서 증발된 서리로 인해 발생한 고온의 증기는 냉기 유로를 따라 냉동, 냉장실로 유입되어 냉동, 냉장실 내부 벽면이나 보관된 음식물 표면에서 다시 응축된다. 이 경우 냉동, 냉장실 유입된 고온의 증기에 의해 냉동, 냉장실의 온도가 높아지기 때문에 제상작동이 종료되고, 증발기(10)의 작동이 재개되어 냉각이 시작되기까지 많은 전력이 소비되며, 보관된 음식물의 온도 또한 높아지게 된다.Therefore, when the ambient temperature near the temperature sensor 30 approaches the limit temperature T, the lower part of the evaporator 10 heats and evaporates the frost that has already melted by the indirect heating heater 22 that is overheated. In the upper portion of the evaporator 10, the frost is left without being removed. The high temperature steam generated by the frost evaporated from the lower portion of the evaporator 10 flows into the freezing and refrigerating chamber along the cold air flow path, and is frozen. It condenses again on the inside walls of the refrigerator or on stored food surfaces. In this case, since the temperature of the freezing and refrigerating chamber is increased by the high temperature steam introduced into the freezing and refrigerating chamber, the defrosting operation is terminated, and a lot of power is consumed until the operation of the evaporator 10 is resumed and the cooling is started. The temperature will also increase.

즉, 상술한 바와 같은 종래 대용량 냉장고의 제상시스템에 의하면 각 히터(20)(22)가 하나의 온도센서(30)에 의해 단순제어되기 때문에 간접가열식 히터(22)의 불필요한 작동으로 인해 전력이 낭비되는 등 냉장고의 작동효율이 저하되고, 보관된 음식물의 온도가 높아짐으로써 신선도가 떨어지게 된다는 문제점이 발생한다.That is, according to the defrosting system of the conventional large-capacity refrigerator as described above, since each heater 20, 22 is simply controlled by one temperature sensor 30, power is wasted due to unnecessary operation of the indirect heating heater 22. The operation efficiency of the refrigerator is lowered, and the freshness is lowered due to the increased temperature of the stored food.

본 발명은 상기한 종래 문제점을 해결하고자 안출된 것으로서, 각 히터가 그 작동특성에 따라 각기 다른 제한온도가 설정된 별도의 온도센서에 의해 제어되도록 함으로써 냉장고의 작동효율 향상 및 냉장고에 보관된 음식물의 신선도 유지에 도움이 되는 냉장고용 제상장치의 제공을 목적으로 한다.The present invention has been made to solve the above-mentioned conventional problems, each heater is controlled by a separate temperature sensor with a different limit temperature set according to its operating characteristics, improving the operating efficiency of the refrigerator and the freshness of the food stored in the refrigerator An object of the present invention is to provide a defroster for a refrigerator that is helpful for maintenance.

도 1은 대용량 냉장고에 구비된 일반적인 제상시스템의 구성을 나타낸 사시도이다.1 is a perspective view showing the configuration of a general defrosting system provided in a large-capacity refrigerator.

도 2는 대용량 냉장고에 구비된 일반적인 제상시스템의 작동순서를 나타낸 플로우챠트이다.2 is a flowchart showing an operation procedure of a general defrosting system provided in a large-capacity refrigerator.

도 3은 본 발명의 실시예에 따른 제상시스템의 구성을 나타낸 사시도이다.3 is a perspective view showing the configuration of a defrosting system according to an embodiment of the present invention.

도 4는 본 발명의 실시예에 따른 제상시스템의 작동순서를 나타낸 플로우챠트이다.4 is a flowchart showing the operation procedure of the defrosting system according to an embodiment of the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

10: 증발기 12: 냉각핀10: evaporator 12: cooling fin

20: 직접가열식 히터 22: 간접가열식 히터20: direct heating heater 22: indirect heating heater

32: 1차 온도센서 34: 2차 온도센서32: 1st temperature sensor 34: 2nd temperature sensor

상기 목적을 달성하기 위하여 제공되는 대용량 냉장고의 제상시스템은 증발기에 접한 상태에서 전도열을 통한 가열작용을 행하는 직접가열식 히터와, 증발기의 하방에 위치되어 복사열을 통한 가열작용을 행하는 간접가열식 히터와, 상기 직접가열식 히터에 근접 위치되어 직접가열식 히터의 발열작용으로 인한 온도상승정도를 감지하는 1차 온도센서와, 상기 간접가열식 히터에 근접 위치되어, 간접가열식 히터의 발열작용으로 인한 온도상승정도를 감지하는 2차 온도센서와, 상기 각 온도센서 주위의 온도가 설정된 제한온도에 도달한 경우, 이를 감지하여 각 히터의 작동을 별도 제어하는 제어회로를 포함하여 구성된다.Defrosting system of a large-capacity refrigerator provided to achieve the above object is a direct heating heater for heating by conducting heat in contact with the evaporator, and an indirect heating heater located below the evaporator for heating by radiant heat; Primary temperature sensor that is located in proximity to the direct heating heater to detect the temperature rise due to the heating action of the direct heating heater, and located in proximity to the indirect heating heater, to detect the temperature rise due to the heating action of the indirect heating heater And a secondary temperature sensor and a control circuit for detecting the temperature when the temperature around each of the temperature sensors reaches a set limit temperature and separately controlling the operation of each heater.

이하, 본 발명의 실시예를 첨부된 도 3과 도 4를 참조로 하여 상세하게 설명하며, 본 발명의 내용 중 종래구성과 동일한 부분에 대해서는 동일한 부호를 부여하기로 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 3 and 4, and the same reference numerals will be given to the same parts as in the prior art.

본 발명의 실시예에 따른 대용량 냉장고의 제상시스템은 도면에 나타난 것과 같이 직접가열식 히터(20)와 간접가열식 히터(22)를 별도로 제어하기 위해, 각 히터(20)(22)와 연계되며 분리 위치된 1, 2차 온도센서(32)(34)를 구비하여 이루어진다.The defrosting system of the large-capacity refrigerator according to the embodiment of the present invention is associated with each heater 20 and 22 and separated from each other in order to separately control the direct heater 20 and the indirect heater 22 as shown in the drawing. It consists of a primary and secondary temperature sensor 32, 34.

그리고, 상기 직접가열식 히터(20)와 연계된 1차 온도센서(32)는 상기 직접가열식 히터(20)의 발열작용으로 인한 온도상승정도를 정밀하게 감지할 수 있도록 증발기(10)의 윗부분에 취부된다.In addition, the primary temperature sensor 32 associated with the direct heater 20 is mounted on the upper portion of the evaporator 10 so as to accurately detect the degree of temperature rise due to the exothermic action of the direct heater 20. do.

간접가열식 히터(22)와 연계된 2차 온도센서(34)는 상기 간접가열식 히터(22)의 발열작용으로 인한 온도상승정도를 정밀하게 감지할 수 있도록 증발기(10)의 아랫부분 즉, 간접가열식 히터(22)와 인접한 위치에 취부된다.The secondary temperature sensor 34 associated with the indirect heating heater 22 has a lower portion of the evaporator 10, that is, the indirect heating type so as to accurately detect the temperature rise due to the exothermic action of the indirect heating heater 22. It is mounted in a position adjacent to the heater 22.

그리고, 각 온도센서(32)(34)에는 연계된 각 히터(20)(22)의 제어기준이 되는 제한온도(T1)(T2)가 설정되는데, 이러한 제한온도(T1)(T2)는 단위시간당 발열량 및 열전달 방식과 같은 각 히터(20)(22)의 작동특성을 고려하여 적절하게 설정되도록 함이 바람직하다.And, each temperature sensor 32, 34 is set to the limit temperature (T 1 ) (T 2 ) which is the control standard of each heater 20, 22 associated with, such a limit temperature (T 1 ) (T 2 ) is preferably set in consideration of the operating characteristics of each heater 20, 22, such as the amount of heat generated per unit time and the heat transfer method.

상술한 바와 같이 구성된 본 발명의 실시예에 따른 제상시스템의 작용을 설명하면 다음과 같다.Referring to the operation of the defrosting system according to an embodiment of the present invention configured as described above are as follows.

도 4에 나타난 것과 같이 냉장고의 냉각작동이 계속되어 일정시간(t)이 경과하면 제상작용이 시작되어 제어회로가 각 히터(20)(22)에 전원을 공급함으로써 각 히터(20)(22)의 발열작용이 시작되고, 이로 인해 증발기(10) 및 그 주위의 온도가 높아지게 된다.As shown in FIG. 4, when the cooling operation of the refrigerator continues and a predetermined time t elapses, the defrosting operation is started, and the control circuit supplies power to each heater 20, 22 to each heater 20, 22. The exothermic action of starts and this causes the temperature of the evaporator 10 and its surroundings to rise.

그리고, 증발기(10)의 표면에 형성된 서리층이 제거되고 증발기(10) 및 그 주위의 온도가 계속 상승하여 1, 2차 온도센서(32)(34)에 각각 설정된 제한온도(T1)(T2)에 도달하면 상기 각 온도센서(32)(34)에서 보내는 신호에 의해 제어회로가 각 히터(20)(22)에 공급되는 전원을 차단함으로써 제상작용이 중지되는데, 이때 상기 1차 온도센서(32)는 전술한 바와 같이 증발기(10)의 윗부분에 취부되어 대부분 직접전달식 히터(20)의 발열작용에 의한 온도변화만을 감지하고, 2차 온도센서(34)는 증발기(10)의 아랫부분에 취부되어 대부분 간접전달식 히터(22)의 발열작용에 의한 온도변화만을 감지하게 됨으로써, 각 히터(20)(22)는 주변의 온도변화상태에 따라 별도로 그 작동상태가 중단된다.Then, the frost layer formed on the surface of the evaporator 10 is removed and the temperature of the evaporator 10 and its surroundings continue to rise so that the limit temperatures T 1 set in the primary and secondary temperature sensors 32 and 34 respectively ( When T 2 ) is reached, defrosting is stopped by the control circuit interrupting the power supplied to each heater 20, 22 by a signal from each of the temperature sensors 32, 34. The sensor 32 is mounted on the upper part of the evaporator 10 as described above, and mostly detects only the temperature change caused by the exothermic action of the direct transfer heater 20, and the secondary temperature sensor 34 is located below the evaporator 10. Mounted on the part to detect only the temperature change due to the heat generation action of the mostly indirect transfer type heater 22, each heater 20, 22 is stopped separately in accordance with the ambient temperature change state.

따라서, 상술한 바와 같은 본 실시예에 따른 제상시스템에서 각 온도센서(32)(34)에 설정된 제한온도(T1)(T2)가 동일한 경우에는, 고온으로 발열작용을 행하는 간접가열식 히터(22)의 작동이 먼저 중단되고, 이어서 직접가열식 히터의 작동이 중단되기 때문에, 각 히터(20)(22)에 대한 효율적인 작동제어가 가능해지는데, 특히 간접가열식 히터(22)의 경우에는 종래와 같이 과열되어 서리를 증발시키는 등의 비정상적인 작동을 행하지 않게 된다.Therefore, in the defrosting system according to the present embodiment as described above, when the limit temperature T 1 (T 2 ) set in each of the temperature sensors 32 and 34 is the same, an indirect heating heater that generates heat at a high temperature ( Since the operation of 22) is stopped first, and then the operation of the direct heating heater is stopped, efficient operation control for each heater 20, 22 is possible. In particular, in the case of the indirect heating heater 22, Overheating will prevent abnormal operation such as evaporation of frost.

더불어, 제상작용이 종료되어 그 작동이 중단된 각 히터(20)(22)는 상대적으로 그 작동이 늦게 중단된 히터(대개의 경우 직접가열식 히터)의 작동 중단시점을 기준으로, 일정시간이 경과하면 동시에 작동을 재개하게 된다.In addition, each heater 20, 22 whose defrosting is terminated and its operation is stopped is relatively constant, and a predetermined time has elapsed based on the operation stopping time of the heater (usually a direct heating heater) that has been relatively late. Will resume operation at the same time.

본 발명에 따른 대용량 냉장고의 제상시스템에 의하면 각 히터가 그 작동특성에 따라 각기 다른 제한온도가 설정된 별도의 온도센서에 의해 효율적으로 제어되기 때문에 전력의 낭비가 방지되고, 히터가 과열됨으로써 서리가 증발하여 냉동, 냉장실의 온도가 높아지는 등의 현상이 발생하지 않기 때문에 냉장고의 작동효율 및 보관된 음식의 신선도 유지에 도움이 된다는 이점이 있다.According to the defrosting system of a large-capacity refrigerator according to the present invention, since each heater is efficiently controlled by a separate temperature sensor having different limiting temperatures set according to its operating characteristics, waste of power is prevented and frost evaporates as the heater is overheated. Therefore, since the phenomenon of freezing and the temperature of the refrigerating chamber does not occur, there is an advantage that it helps to maintain the operating efficiency of the refrigerator and the freshness of the stored food.

Claims (1)

증발기에 접한상태에서 전도열을 통한 가열작용을 행하는 직접가열식 히터와,A direct heating heater performing heating by conducting heat in contact with an evaporator, 증발기의 하방에 위치되어 복사열을 통한 가열작용을 행하는 간접가열식 히터와,An indirect heating heater located below the evaporator and performing heating by radiant heat; 상기 직접가열식 히터에 근접 위치되어, 직접가열식 히터의 발열작용으로 인한 온도상승정도를 감지하는 1차 온도센서와,A primary temperature sensor positioned in proximity to the direct heater and detecting a temperature rise due to a heat generation action of the direct heater; 상기 간접가열식 히터에 근접 위치되어 간접가열식 히터의 발열작용으로 인한 온도상승정도를 감지하는 2차 온도센서와,A second temperature sensor positioned close to the indirect heating heater and detecting a temperature rise due to the heat generation of the indirect heating heater; 상기 각 온도센서 주위의 온도가 설정된 제한온도에 도달한 경우, 이를 감지하여 각 히터의 작동을 별도 제어하는 제어회로Control circuit for controlling the operation of each heater separately by detecting when the temperature around each temperature sensor reaches the set limit temperature 를 포함하는 대용량 냉장고의 제상시스템.Defrost system of a large-capacity refrigerator comprising a.
KR10-1999-0051614A 1999-11-19 1999-11-19 Defrosting system of refrigerator KR100512641B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017034314A1 (en) * 2014-10-21 2017-03-02 엘지전자 주식회사 Defroster and refrigerator having same
KR20230010385A (en) 2021-07-12 2023-01-19 엘지전자 주식회사 refrigerator

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JP2894380B2 (en) * 1991-09-13 1999-05-24 富士電機株式会社 Cold air circulation type defroster for showcase
JP2582320B2 (en) * 1991-12-20 1997-02-19 オリオン機械株式会社 Operation stop device in environmental test equipment
JPH09113100A (en) * 1995-10-11 1997-05-02 Sanyo Electric Co Ltd Defrosting device for low-temperature display case
JP2823151B2 (en) * 1995-12-25 1998-11-11 中野冷機株式会社 Open showcase
KR19990050894A (en) * 1997-12-17 1999-07-05 구자홍 Defrost heater control device and method of the refrigerator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017034314A1 (en) * 2014-10-21 2017-03-02 엘지전자 주식회사 Defroster and refrigerator having same
US10871320B2 (en) 2014-10-21 2020-12-22 Lg Electronics Inc. Defroster and refrigerator having same
KR20230010385A (en) 2021-07-12 2023-01-19 엘지전자 주식회사 refrigerator

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