How the temperature sensor used in the refrigerator

As to the refrigerator in the aspects of energy-saving, environmental protection, comfortable requirement enhances unceasingly, more and more intelligent control technology is introduced into the refrigerator. Released in China home appliance association, on the other hand, the Chinese household electrical appliance industry 'twelfth five-year' development planning advice ', the home appliance industry energy conservation and emissions reduction in the prominent position, thus energy saving storm blew up all kinds of electrical appliances industry products. The personage inside course of study points out, the development function of temperature sensors in the smart home appliances will become more and more highlighted.

March 19 ~ 22, 2013, the Chinese electrical appliances expo ( 敬畏) Was held in Shanghai new international expo center show that a certain well-known brand original six door refrigerator received the attention of people, with a new generation vacuum freezer room, at the same time, the new intelligent vacuum ice can greenhouse vegetables, fish food according to the different ingredients, automatic switch 1 ℃ 1 ℃ in the best preservation temperature, saves on the manual adjustment, easy to enjoy delicious and healthy.

especially in the aspect of energy conservation, a well-known brand refrigerator set up power saving program, in the case of not affect food preservation, the refrigeration strength modestly weaker at the same time, control the turning speed of the compressor. Usually the refrigerator door open after 1 minute voice prompt will also reduced to 30 seconds after the prompt, and the LED light inside the refrigerator will be through the lights dimmed hint to shut the door as soon as possible. Intelligent memory analysis function, through the temperature sensor and the door opening and closing of the frequency, used in the analysis using the family, such as no one in the middle of the night or family don't often use heater defrost during the running, using the high frequency time, suppress the temperature rise caused by heater defrost.

it is reported, the operation principle of the temperature sensor in the refrigerator is this: according to the temperature of the fridge and freezer condition to decide whether to open the compressor, if the temperature of the freezer is too high, then open the electromagnetic unpopular V1, close the valve, V2, V3 and open the compressor at the same time, to produce high temperature and high pressure superheated steam, through the condenser cooling, drying filter drier, MAO details flow tube after decompression, the evaporator evaporation cooling, produce low pressure dry gas in low temperature. Through the electromagnetic valve V1 into the freezer, to lower refrigeration temperature quickly, when required by the temperature of closed compressor, at the same time close the solenoid valve V1. If the temperature of the freezer is too high, should be open to close V2 V1 and V3. Frost V3 electromagnetic valve is mainly used in the freezer. Need to turn the box when open the V3, flowed from the compressor will be at a constant speed of high temperature and high pressure gas flows through the freezer can vaporization freezer frost layer. To achieve the effect of frost. Generalized frost time is shorter, or it will hurt for food.

the stand or fall of refrigerator temperature sensor performance is critical, the differential method is as follows due to the refrigerator temperature sensor is a negative temperature coefficient thermistor, so we can use the 'method' to measure the resistance change. When the hand hold temperature sensor, its resistance change with temperature, normal for thousands of o ~ dozens of Europe. After the hand, its resistance and rebound. If hand temperature sensor, its resistance, there is no change or variation range is small, so the temperature sensor has a problem, should be replaced.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor