WO2012034299A1 - 一种冰箱除霜控制系统及其控制方法 - Google Patents

一种冰箱除霜控制系统及其控制方法 Download PDF

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Publication number
WO2012034299A1
WO2012034299A1 PCT/CN2010/078183 CN2010078183W WO2012034299A1 WO 2012034299 A1 WO2012034299 A1 WO 2012034299A1 CN 2010078183 W CN2010078183 W CN 2010078183W WO 2012034299 A1 WO2012034299 A1 WO 2012034299A1
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WIPO (PCT)
Prior art keywords
refrigerator
temperature
compartment
defrosting
temperature sensor
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PCT/CN2010/078183
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English (en)
French (fr)
Inventor
宋志红
常见虎
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海信容声(广东)冰箱有限公司
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Publication of WO2012034299A1 publication Critical patent/WO2012034299A1/zh

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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
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • 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
    • F25D2700/12—Sensors measuring the inside temperature
    • F25D2700/121—Sensors measuring the inside temperature of particular compartments
    • 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
    • F25D2700/12—Sensors measuring the inside temperature
    • F25D2700/122—Sensors measuring the inside temperature of freezer compartments
    • 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
    • F25D2700/14—Sensors measuring the temperature outside the refrigerator or freezer

Definitions

  • the present invention relates to the technical field of refrigerators in electrical equipment, and more particularly to a refrigerator defrosting control system and a control method thereof.
  • the general defrosting device of the refrigerator includes an evaporator, a defrosting heating tube, a water receiving tray heating tube, a defrosting temperature sensor, a high temperature fuse, and a refrigerator controller.
  • the defrosting process of the refrigerator is after the refrigerator works for a certain period of time, the refrigerator controller is connected to the defrosting heating tube, and the defrosting heating tube works until the frost layer of the evaporator melts, and the defrosting water is discharged from the water receiving tray and the drain pipe, except The frost process is over.
  • the heating tube has high power, which consumes energy and wastes the original cooling capacity of the evaporator.
  • the temperature in the refrigerator rises too much during the defrost cycle, resulting in an increase in energy consumption of the refrigerator.
  • the technical problem to be solved by the present invention is to provide a refrigerator defrosting control system and a control method thereof for utilizing temperature difference and heat exchange, both defrosting an evaporator and cooling a refrigerating compartment, and solving the energy of the refrigerator in the defrosting process.
  • the technical solution of the present invention is:
  • a refrigerator defrosting control system includes a circulation fan, a controller, a defrosting temperature sensor connected to the controller, a refrigerating compartment temperature sensor, a freezing compartment temperature sensor, and an ambient temperature sensor, and the circulation fan is disposed at a side of the refrigerator evaporator.
  • the air duct at the position of the circulating fan is provided with an air inlet of the freezer compartment and an air inlet of the refrigerator compartment, and a freezer compartment air inlet is provided at the air inlet of the freezer compartment, and an air damper is provided at the air inlet of the refrigerator compartment, and an air inlet of the refrigerator compartment is provided at the air inlet of the refrigerator compartment, and the refrigerator evaporator is provided.
  • the refrigerator defrosting control system further includes an electric heater connected to the controller, the electric heater being embedded in the refrigerator evaporator.
  • the defrost temperature sensor is provided on the refrigerator evaporator.
  • the refrigerating compartment temperature sensor is provided in the refrigerating compartment.
  • the freezing temperature sensor is provided in the freezing compartment.
  • the ambient temperature sensor is located at the top of the refrigerator.
  • the above control method of the refrigerator defrosting control system comprises the following steps:
  • step 1 The refrigerator is powered on and cooled, and the controller detects the temperature of the refrigerator compartment and the temperature of the freezer compartment through the refrigerator compartment temperature sensor and the freezer compartment temperature sensor, and determines whether each compartment requires refrigeration according to the user's refrigerating set temperature Tr0 and the freezing set temperature Tf0.
  • the controller controls the air inlet damper of the freezer compartment, the electric damper of the freezer compartment return air damper and the refrigerating compartment inlet vent, the refrigerator compressor works to cool, the circulating fan works, and the refrigeration cycle The wind is circulated and cooled according to the normal circulation loop, and the refrigerating compartment and the freezing compartment are both cooled.
  • the controller controls the refrigerating compartment air inlet to close the electric damper, and the refrigerating compartment stops cooling and freezing.
  • the room continues to cool to the shutdown temperature T3, and the refrigerator compressor is stopped;
  • Step 2 When the refrigerator is In the case of self-circulating wind defrosting conditions, the self-circulating wind defrosting process is entered: at this time, the controller controls the air inlet damper of the freezer compartment and the air damper of the freezer compartment to be closed, and the electric damper and the circulating fan of the air inlet of the refrigerator compartment are controlled to open.
  • the circulating air is circulated according to the refrigerator evaporator to the refrigerating chamber. Due to the large temperature difference between the evaporator and the refrigerating chamber of the refrigerator, the refrigerator evaporator is defrosted by the hot air in the refrigerating chamber, and the cooling capacity of the refrigerator evaporator refrigerates the refrigerating chamber.
  • Step 3 At the same time as step 2, the controller accumulates the continuous running time of the refrigerator compressor.
  • the continuous running time of the refrigerator compressor reaches t1, and the freezing chamber temperature is greater than Tf0; or when the ambient temperature is less than 0 °C, the compressor running time accumulates.
  • the controller turns off the refrigerator compressor, the circulation fan, the air inlet damper of the freezer compartment, the electric damper of the return air outlet of the freezer compartment, and the electric damper of the air inlet of the refrigerating compartment, and opens the electric heater in the evaporator of the refrigerator to assist the defrosting.
  • the defrosting temperature sensor detects that the refrigerator evaporator temperature is T2, the auxiliary defrosting is exited.
  • the control method of the refrigerator defrosting control system is characterized in that: a is 1 to 5 ° C and the shutdown temperature is T 3 ⁇ Tf 0 in step 1. Tf0 ranges from 12 ° C to 23 ° C.
  • the control method of the refrigerator defrosting control system described above is characterized by:
  • the self-circulating defrost condition of step 2 is that the evaporator evaporator temperature is T2 ⁇ 0°C, the refrigerating compartment temperature>Tr0 and the compressor is stopped;
  • the self-circulating defrost exit condition is the refrigerator evaporator temperature is T2>0°C, the refrigerating compartment temperature T1 ⁇ 0°C,
  • the freezer compartment temperature is greater than Tf0+b; b ranges from 2 °C to 6 °C.
  • the control method of the refrigerator defrosting control system is characterized in that: t1 in step 3 is 4 to 8 hours, The t2 is 8 to 15 hours, and the refrigerator evaporator temperature is 4 to 10 °C.
  • the structural features of the invention are the air inlet and the return air inlet of the freezer compartment, and the air inlet of the refrigerator compartment is equipped with a controllable electric damper; the self-circulating wind defrosting process controls the cooling and defrosting by controlling the electric damper and the circulating fan of each tuyere.
  • Self-circulating wind defrosting usually does not use electric heater defrosting to save energy without causing continuous high temperature to affect the temperature of the refrigerator, the temperature of the refrigerator is small, and the energy consumption is reduced; the invention also utilizes the temperature difference between the refrigerator and the refrigerator evaporator.
  • the refrigerator evaporator is defrosted by the relatively hot air in the refrigerating compartment, and the cold air of the refrigerator evaporator cools and humidifies the refrigerating compartment, which is both defrosted and cooled, has high energy efficiency utilization, and saves energy.
  • FIG. 1 is a schematic structural view of a control system of the present invention
  • Figure 2 is a flow chart of the control method of the present invention.
  • FIG. 3 is a block diagram showing the composition of the control system of the present invention.
  • FIGS. 1 and 3 are respectively a schematic structural diagram and a block diagram of a control system of the present invention, including a circulation fan 1, a controller 9, a defrosting temperature sensor 6, a refrigerating compartment temperature sensor 7, a freezing compartment temperature sensor 8, and an ambient temperature sensor 12 connected to the controller 9, and the circulation fan 1 is installed beside the refrigerator evaporator 2, As shown in the rear of the refrigerator evaporator 2, the air passage behind the circulation fan 1 is divided into a freezer compartment air inlet and a refrigerating compartment air inlet, and a freezer compartment air inlet and a refrigerating compartment air inlet are respectively installed with a freezer compartment air inlet electric damper 3 and The air inlet 4 of the refrigerating compartment is provided with an air damper 4 at the air inlet of the refrigerator, and a return air outlet of the freezer compartment and a return air outlet of the refrigerating compartment.
  • the return air outlet of the freezer compartment is provided with a refrigerating compartment return air damper 5.
  • the control system of the present invention is also The electric heater 11 is connected to the controller 9, and the electric heater 11 is embedded in the refrigerator evaporator 2, and the refrigerating compartment temperature sensor 7 is installed in the refrigerating chamber, and the freezing temperature sensing is performed.
  • the controller 8 is installed in the freezing compartment, and the controller 9 controls the operation of the circulation fan 1 and the refrigerator compressor 10. Below the refrigerator evaporator 2, there is a water receiving tray for discharging defrosting water.
  • FIG. 2 is a flow chart of a control method of the present invention, including the following steps:
  • step 1 The refrigerator is electrically cooled, and the controller 9 detects the refrigerator compartment temperature and the freezer compartment temperature by the refrigerator compartment temperature sensor 7 and the freezer compartment temperature sensor 8, and determines each compartment based on the user's refrigerating set temperature Tr0 and the freezing set temperature Tf0. Whether refrigeration is required; when both the refrigerating compartment and the freezing compartment require cooling, the controller 9 controls the air inlet damper 3 of the freezing compartment, the refrigerating compartment return air damper 5 and the refrigerating compartment air inlet damper 4 are all opened, and the refrigerator compressor 10 is operated. Refrigeration, the circulating fan 1 works, the refrigeration circulating air is circulated and cooled according to the normal circulation loop, and the refrigerating compartment and the freezing compartment are both cooled.
  • the controller 9 controls the refrigerating compartment air inlet
  • the electric damper 4 is closed, the refrigerating compartment stops cooling, the freezing compartment continues to cool to the shutdown temperature T3, and the refrigerator compressor 10 is stopped;
  • a is 1 to 5 ° C, shutdown temperature T 3 ⁇ Tf 0 , Tf0 range 12 ° C - 23 ° C.
  • Step 2 Self-circulating wind defrosting process: self-circulating defrosting conditions include but are not limited to evaporator temperature ⁇ 0 ° C, refrigerator temperature > Tr0, compressor shutdown, etc.
  • the refrigerator enters the self-circulating wind Defrost process: At this time, the controller 9 controls the freezer compartment air inlet damper 3 and the freezer compartment return air damper 5 to close, control the refrigerating compartment air inlet electric damper 4 and the circulation fan 1 to open, and the circulating air is pressed to the refrigerator evaporator 2 to refrigerate
  • the chamber is circulated, because the temperature difference between the refrigerator evaporator 2 and the refrigerating chamber is large, the refrigerator evaporator 2 is defrosted by the hot air of the refrigerating chamber, and the cold volume of the refrigerator evaporator 2 is used to cool and humidify the refrigerating chamber until If the temperature detected by the frost temperature sensor 6 or the refrigerating compartment temperature sensor 7 or the freezing compartment temperature sensor 8 meets
  • Step 3 At the same time as step 2, the controller 9 accumulates the continuous operation time of the refrigerator compressor 10, when the continuous operation time of the refrigerator compressor 10 reaches t1, and the freezing chamber temperature is greater than Tf0; or when the ambient temperature is less than 0 ° C, the compressor
  • the controller 9 turns off the refrigerator compressor 10, the circulation fan 1, the freezer inlet air damper 3, the freezer return air damper 5, and the refrigerating compartment air inlet electric damper 4, and opens the refrigerator evaporator 2
  • the electric heater 11 operates to assist the defrosting, when the defrosting temperature sensor 6 detects that the temperature of the refrigerator evaporator 2 is T At 2 o'clock, the auxiliary defrost is exited.
  • T1 is 4 to 8 hours
  • t2 is 8 to 15 hours
  • refrigerator evaporator 2 temperature is T2 of 4 to 10 °C.

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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)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Description

一种冰箱除霜控制系统及其控制方法
技术领域
本发明涉及电器设备中冰箱的技术领域，尤其是 涉及 一种冰箱除霜控制系统及其控制方法。
背景技术
通常情况下冰箱运行一段时间后蒸发器表面会结一层霜，该霜层会影响蒸发器与冰霜内空气的热交换，降低制冷效率，所以冰箱运行一段时间后必须除霜。一般冰箱的除霜装置包括蒸发器、除霜加热管、接水盘加热管、除霜温度传感器、高温熔断器、冰箱控制器。一般冰箱的除霜过程是冰箱工作一定时间后，冰箱控制器接通除霜加热管，除霜加热管工作一直到蒸发器的霜层溶化，化霜水从接水盘和排水管排出，除霜过程结束。期间由于除霜加热管长期加热，加热管功率大，既消耗能量又浪费了蒸发器原有的冷量，同时除霜周期内使冰箱内温度上升过大，导致冰箱能耗增加。
发明内容
本发明要解决的技术问题是提供一种利用温度差和热交换，既对蒸发器除霜又对冷藏室制冷的冰箱除霜控制系统及其控制方法，以解决冰箱在除霜过程中的能量消耗和冷量浪费的问题。
为解决上述技术问题，本发明的的技术方案是：
一种冰箱除霜控制系统，包括循环风扇、控制器、与控制器连接的除霜温度传感器、冷藏室温度传感器、冷冻室温度传感器和环境温度传感器，循环风扇设在冰箱蒸发器的旁侧，循环风扇所在位置的风道设有冷冻室进风口和冷藏室进风口，冷冻室进风口处设有冷冻室进风口电动风门和冷藏室进风口处设有冷藏室进风口电动风门，冰箱蒸发器对应循环风扇另一侧所在的风道设有冷冻室回风口和冷藏室回风口，冷冻室回风口设有冷冻室回风口电动风门。
所述的 冰箱除霜控制系统 还包括 与控制器连接的电加热器，所述电加热器内嵌在冰箱蒸发器上。
所述除霜温度传感器设在冰箱蒸发器上 。
所述冷藏室温度传感器设在冷藏室内。
所述冷冻温度传感器）设在冷冻室内。
所述环境温度传感器设在在冰箱顶部。
上述冰箱除霜控制系统的控制 方法，包括下列步骤：
步骤1： 冰箱上电制冷，控制器通过冷藏室温度传感器和冷冻室温度传感器各自检测冷藏室温度和冷冻室温度，并根据用户的冷藏设定温度Tr0和冷冻设定温度Tf0，判断各间室是否要求制冷；当冷藏室和冷冻室都要求制冷时，控制器控制冷冻室进风口电动风门，冷冻室回风口电动风门和冷藏室进风口电动风门都打开，冰箱压缩机工作制冷，循环风扇工作，制冷循环风按正常循环回路循环制冷，冷藏室和冷冻室都制冷，当制冷到冷藏室温度T1-a＞冷藏设定温度Tr0时，控制器控制冷藏室进风口电动风门关闭，冷藏室停止制冷，冷冻室继续制冷到停机温度T3，冰箱压缩机停机；
步骤2：当冰箱符 合自循环风除霜条件时，进入自循环风除霜过程：此时控制器控制冷冻室进风口电动风门和冷冻室回风口电动风门）关闭，控制冷藏室进风口电动风门和循环风扇打开，循环风按冰箱蒸发器到冷藏室进行循环，因冰箱蒸发器与冷藏室的温差大，通过冷藏室的热空气对冰箱蒸发器进行除霜，同时冰箱蒸发器的冷量又对冷藏室进行制冷和加湿，直到除霜温度传感器或冷藏室温度传感器或冷冻室温度传感器检测的温度符合自循环除霜退出条件，则退出自循环除霜，然后按正常制冷控制；
步骤3： 在步骤2的同时，控制器对冰箱压缩机连续运行时间进行累积，当冰箱压缩机连续运行时间累积达到t1时，且冷冻室温度大于Tf0；或当环境温度小于0℃，压缩机运行时间累积达到t2时，控制器关闭冰箱压缩机、循环风扇、冷冻室进风口电动风门，冷冻室回风口电动风门和冷藏室进风口电动风门，打开冰箱蒸发器内的电加热器工作进行辅助除霜，当除霜温度传感器检测到冰箱蒸发器温度为T2时，则退出辅助除霜。
上述冰箱除霜控制系统的控制 方法，其特征在于：步骤1所 述 a为1～5℃，停机温度T 3＜Tf 0 ， Tf0范围12℃-23℃。
上述冰箱除霜控制系统的控制 方法，其特征在于：步 骤2所述自循环除霜条件为冰箱蒸发器温度为T2＜0℃，冷藏室温度＞Tr0和压缩机停机；自循环除霜退出条件为冰箱蒸发器温度为T2＞0℃，冷藏室温度T1＜0℃， 冷冻室温度大于Tf0+b ； b的范围2℃-6℃。
上述冰箱除霜控制系统的控制 方法，其特征在于：步骤3所 述t1为4～8小时， t2为8～15小时，冰箱蒸发器温度为T2为4～10℃。
本发明相对于现有技术的有益效果是：
本发明的结构特点是冷冻室进风口和回风口，冷藏室进风口都装有可控制的电动风门；自循环风除霜过程是通过控制各风口的电动风门及循环风扇来控制制冷和除霜，自循环风除霜通常不使用电加热器除霜既节省电能又不会产生持续高温影响冰箱温度，冰箱温度回升小，降低能耗；本发明还利用冷藏室与冰箱蒸发器的温度差，通过冷藏室的相对热空气对冰箱蒸发器进行除霜，同时冰箱蒸发器的冷气对冷藏室进行制冷和加湿，既除霜又制冷，能效利用率高，节省能耗。
附图说明
下面结合附图和具体实施方式对本发明作进一步详细的说明。
图1是本发明的控制系统结构组成示意图；
图2是本发明的控制方法流程图；
图3是本发明的控制系统组成框图。
具体实施方式
图1、图3分别为 本发明的控制系统结构组成示意图和组成框图 ，包括 循环风扇1、控制器9、与控制器9连接的除霜温度传感器6、冷藏室温度传感器7、冷冻室温度传感器8和环境温度传感器12，循环风扇1安装在冰箱蒸发器2的旁侧，如图设在冰箱蒸发器2的后面，循环风扇1后面的风道分为冷冻室进风口和冷藏室进风口，冷冻室进风口和冷藏室进风口处分别安装冷冻室进风口电动风门3和冷藏室进风口电动风门4，冰箱蒸发器2前面风道设有冷冻室回风口和冷藏室回风口，冷冻室回风口安装有冷冻室回风口电动风门5。本发明的控制系统还 包括 与控制器9连接 的电加热器11，该电加热器11内嵌在冰箱蒸发器2上，冷藏室温度传感器7安装在冷藏室内，冷冻温度传感 器8安装在冷冻室内，控制器9控制循环风扇1和冰箱压缩机10的工作，冰箱蒸发器2的下方设有排出 化 霜水的接水盘。
图2为 本发明的控制方法流程图， 包括下列步骤：
步骤1： 冰箱上电制冷，控制器9通过冷藏室温度传感器7和冷冻室温度传感器8各自检测冷藏室温度和冷冻室温度，并根据用户的冷藏设定温度Tr0和冷冻设定温度Tf0，判断各间室是否要求制冷；当冷藏室和冷冻室都要求制冷时，控制器9控制冷冻室进风口电动风门3，冷冻室回风口电动风门5和冷藏室进风口电动风门4都打开，冰箱压缩机10工作制冷，循环风扇1工作，制冷循环风按正常循环回路循环制冷，冷藏室和冷冻室都制冷，当制冷到冷藏室温度T1-a＞冷藏设定温度Tr0时，控制器9控制冷藏室进风口电动风门4关闭，冷藏室停止制冷，冷冻室继续制冷到停机温度T3，冰箱压缩机10停机；其中 a为1～5℃，停机温度T 3＜Tf 0 ， Tf0范围12℃-23℃。
步骤2： 自循环风除霜过程：自循环除霜条件包括但不限于蒸发器温度＜0℃，冷藏室温度＞Tr0，压缩机停机等，当冰箱符合自循环风除霜条件时，冰箱进入自循环风除霜过程：此时控制器9控制冷冻室进风口电动风门3和冷冻室回风口电动风门5关闭，控制冷藏室进风口电动风门4和循环风扇1打开，循环风按冰箱蒸发器2到冷藏室进行循环，因冰箱蒸发器2与冷藏室的温差大，通过冷藏室的热空气对冰箱蒸发器2进行除霜，同时冰箱蒸发器2的冷量又对冷藏室进行制冷和加湿，直到除霜温度传感器6或冷藏室温度传感器7或冷冻室温度传感器8检测的温度符合自循环除霜退出条件，则退出自循环除霜，然后按正常制冷控制；自循环除霜退出条件为冰箱蒸发器2温度为T2＞0℃，冷藏室温度T1＜0℃，冷冻室温度大于Tf0+b；b的范围2℃-6℃。
步骤3： 在步骤2的同时，控制器9对冰箱压缩机10连续运行时间进行累积，当冰箱压缩机10连续运行时间累积达到t1时，且冷冻室温度大于Tf0；或当环境温度小于0℃，压缩机运行时间累积达到t2时，控制器9关闭冰箱压缩机10、循环风扇1、冷冻室进风口电动风门3，冷冻室回风口电动风门5和冷藏室进风口电动风门4，打开冰箱蒸发器2内的电加热器11工作进行辅助除霜，当除霜温度传感器6检测到冰箱蒸发器2温度为T 2 时，则退出辅助除霜。 t1为4～8小时， t2为8～15小时，冰箱蒸发器2温度为T2为4～10℃。

Claims (10)

  1. 一种冰箱除霜控制系统，包括控制器（9）、与控制器（9）连接的除霜温度传感器（6），其特征在于：还包括循环风扇（1）、与控制器（9）连接的冷藏室温度传感器（7）、冷冻室温度传感器（8）和环境温度传感器（12），循环风扇（1）设在冰箱蒸发器（2）的旁侧，循环风扇（1）所在位置的风道设有冷冻室进风口和冷藏室进风口，冷冻室进风口处设有冷冻室进风口电动风门（3）和冷藏室进风口处设有冷藏室进风口电动风门（4），冰箱蒸发器（2）对应循环风扇（1）另一侧所在的风道设有冷冻室回风口和冷藏室回风口，冷冻室回风口设有冷冻室回风口电动风门（5）。
  2. 根据权利要求1所述的 冰箱除霜控制系统 ，其特征在于：还包括 与控制器（9）连接 的电加热器（11），所述电加热器（11）内嵌在冰箱蒸发器（2）上。
  3. 根据权利要求1所述的 冰箱除霜控制系统 ，其 特征在于：所述除霜温度传感器（6）设在冰箱蒸发器（2）上 。
  4. 根据权利要求1所述的 冰箱除霜控制系统 ，其 特征在于：所述冷藏室温度传感器（7）设在冷藏室内。
  5. 根据权利要求1所述的 冰箱除霜控制系统 ，其 特征在于：所述冷冻温度传感器（8）设在冷冻室内。
  6. 根据权利要求1所述的 冰箱除霜控制系统，其特征在于：所述环境温度传感器（12）设在在冰箱顶部。
  7. 一种根据权利要求1所述的冰箱除霜控制系统的控制方法，其 特征在于：包括下列步骤：
    步骤1： 冰箱上电制冷，控制器（9）通过冷藏室温度传感器（7）和冷冻室温度传感器（8）各自检测冷藏室温度和冷冻室温度，并根据用户的冷藏设定温度Tr0和冷冻设定温度Tf0，判断各间室是否要求制冷；当冷藏室和冷冻室都要求制冷时，控制器（9）控制冷冻室进风口电动风门（3），冷冻室回风口电动风门（5）和冷藏室进风口电动风门（4）都打开，冰箱压缩机（10）工作制冷，循环风扇（1）工作，制冷循环风按正常循环回路循环制冷，冷藏室和冷冻室都制冷，当制冷到冷藏室温度T1-a＞冷藏设定温度Tr0时，控制器（9）控制冷藏室进风口电动风门（4）关闭，冷藏室停止制冷，冷冻室继续制冷到停机温度T3，冰箱压缩机（10）停机；
    步骤2：当冰箱符合 自循环风除霜条件时，进入自循环风除霜过程：此时控制器（9）控制冷冻室进风口电动风门（3）和冷冻室回风口电动风门（5）关闭，控制冷藏室进风口电动风门（4）和循环风扇（1）打开，循环风按冰箱蒸发器（2）到冷藏室进行循环，因冰箱蒸发器（2）与冷藏室的温差大，通过冷藏室的热空气对冰箱蒸发器（2）进行除霜，同时冰箱蒸发器（2）的冷量又对冷藏室进行制冷和加湿，直到除霜温度传感器（6）或冷藏室温度传感器（7）或冷冻室温度传感器（8）检测的温度符合自循环除霜退出条件，则退出自循环除霜，然后按正常制冷控制；
    步骤3：在步骤2的同时，控制器（9）对冰箱压缩机（10）连续运行时间进行累积，当冰箱压缩机（10）连续运行时间累积达到t1时，且冷冻室温度大于Tf0；或当环境温度小于0℃，压缩机运行时间累积达到t2时，控制器（9）关闭冰箱压缩机（10）、循环风扇（1）、冷冻室进风口电动风门（3），冷冻室回风口电动风门（5）和冷藏室进风口电动风门（4），打开冰箱蒸发器（2）内的电加热器工作进行辅助除霜，当除霜温度传感器(6)检测到冰箱蒸发器（2）温度为T2时，则退出辅助除霜。
  8. 根据权利要求7所述的冰箱除霜控制系统的控制方法，其特征在于：步骤1所述a为1～5℃，停机温度T3＜Tf0；Tf0范围12℃-23℃。
  9. 根据权利要求7所述的冰箱除霜控制系统的控制方法，其特征在于：步骤2所述自循环除霜条件为冰箱蒸发器（2）温度为T2＜0℃，冷藏室温度＞Tr0和压缩机停机；自循环除霜退出条件为冰箱蒸发器（2）温度为T2＞0℃，冷藏室温度T1＜0℃，冷冻室温度大于Tf0+b； b的范围2℃-6℃。
  10. 根据权利要求7 所 述的 冰箱除霜控制系统的控制 方法，其特征在于：步骤3所 述t1为4～8小时， t2为8～15小时，冰箱蒸发器（2）温度为T2为4～10℃。
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