Faced with the gradual popularization and development of intelligent home networks , the introduction of various sensors into home appliances has become more urgent. It is hoped that home electrical energy will increase the comfort of use, reduce energy consumption and water consumption, facilitate cleaning, reduce noise and vibration, improve the quality of use, and achieve complex intelligence.
Previously, sensors were mainly used in temperature control and level control systems, and their functions have now improved: 1 Basically, negative temperature coefficient (NTC, Negative Temperature Coefficient) and positive temperature coefficient (PTC, Positive Temperature Coefficient) are used in all temperature measurements. Resistance; 2 measuring the residual humidity with an inductive sensor; 3 measuring the rotational speed of the washing machine and the dryer with a rotational speed sensor; 4 capacitive sensor for button switch operation; 5 integrated temperature sensor for indicating engine overload.
In recent years, new and improved miniature sensors have been used in washing machines and dishwashers.
(1) Pressure sensors are used as water level switches or more complex devices, such as monitoring of foam levels in washing machines and dryers.
(2) Chemical sensors are used for water quality monitoring. Monitoring parameters include turbidity, color, surface tension, detergent solubility, pH, etc., and then determine the number of rinse cycles (solution sensing system).
(3) The photoelectric system is used to monitor the turbidity of the washing machine so that the number of flushing cycles is consistent with the actual needs (aqueous agent system).
(4) The electromagnetic sensor is used in the dishwasher to control the movement of the spray arm.
Advanced sensors are also used in many other appliances.
(1) Non-contact detection systems, for example, micromachined thermocouple infrared sensors for temperature control, which can also be used in cookware, hair care appliances and toasters.
(2) The flow sensor can be used for the detection of air quality in electric fans and vacuum cleaners.
(3) Acceleration and slope sensors can be used in electric arcs.
(4) Intelligent multi-gas sensor (artificial nose) can be used in automatic accompanying baking control.
Sensors for heating and temperature control are: temperature sensors and switches, pressure sensors and switches, gas and liquid flow sensors. Temperature control is one of the earliest established and most important functions in home appliances. A good example is the uranium resistance temperature sensor based on advanced film fiber technology, which is commonly used in kitchen hot plates and ovens.
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