A control method of a heater used in the automatic thermal cleaning process of a range hood

Abstract

The invention discloses a control method for a heater used in the automatic thermal cleaning process of a range hood. The method includes: adjusting the working time of a water pump in each cycle, which is used to change the resistance value of a PTC heater material to control The heating power of the PTC heater, the power of the PTC heating is detected by detecting the current of the PTC heater when it is working, and the pump water volume can be changed by changing the pumping time of the water pump in each cycle according to the change of the power. The temperature of the heater material is in a small fluctuation, so as to ensure that the resistance value of the PTC heater is in a stable state, thereby keeping the heating power of the PTC heater stable.

Description

technical field [0001] The invention relates to the technical field of range hood cleaning, in particular to a control method of a heater used in the automatic thermal cleaning process of a range hood. Background technique [0002] At present, some of the range hoods on the market have automatic cleaning functions. The cleaning functions can be divided into two types according to whether they have heating components. One is the cold cleaning function, that is, the cleaning without heating components; the other is the hot cleaning function. , this function has a heating device, such as some models on the market with steam washing, steam washing and other cleaning functions, there are two commonly used heating devices with this cleaning function, namely resistive load heater and PTC (Positive Temperature Coefficient: Positive Temperature Coefficient) heater, when a fixed voltage (such as 220 volts of mains) is loaded on both ends of the resistive load heater, since the resista...

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Problems solved by technology

[0003] Therefore, when a resistive load heater is used, the heating power can be controlled more conveniently, making it easier to control the steam volume or hot water temperature during the cleaning process under a constant heating power; when a PTC heater is used, the PTC heating power It changes with the temperature of the PTC material, and the structure of the PTC heater is generally fixed on one side of the PTC heating body with a heat sink for heat dissipation, and the heat sink is thicker so that the PTC can quickly achieve thermal balance and power stability. The temperature of the PTC heater is generally installed with a temperature measuring probe on the outside of the heat sink or an armored temperature measuring probe is opened on the heat sink. These temperature measurement methods cannot directly measure the temperature of the PTC heating body. The difference between the temperature and the actual temperature of the PTC heating material is large and lags behind, so it is difficult to accurately control the heating power of the PTC heater by detecting the temperature