Temperature and safety control device for liquid heater

Abstract

The invention relates to a temperature and safety control device of a liquid heater, comprising a DC power supply, a circuit board, a fan and a first heat detector of the fan which are all arranged in a housing, and a keyswitch which is arranged on the housing; wherein, the circuit board is provided with a keyswitch circuit, a first heater detector circuit, a fan switch circuit and a heater switch circuit. The invention is characterized in that the device further comprises a pressure switch gear which comprises a slidable metal slide block, one part of which extends out the housing, a metal moving contact block connected with the metal slide block into a whole, a metal static contact block which is fixed in the housing and is matched with the metal moving contact block, and an offsetting spring driving the metal slide block to move; the metal slide block is inside provided with a second heat detector; the circuit board is further provided with a pressure switch circuit and a second heat detector circuit; a foot crust of the housing is inside provided with a weight switch, the circuit board is provided with a weight switch circuit; the circuit board is further provided with a CPU which receives the signals from the keyswitch circuit, the first and the second heat detector circuits and the weight switch circuit as well as the pressure switch circuit and then controls the operation of the heater switch circuit and the fan switch circuit. The invention has the advantages that the heater switch circuit is set in work when the liquid heater is provided with a water bottle with water which has the double protective function, the use is safe and reliable, and the structure is simple.

Description

technical field [0001] The invention relates to a temperature and safety control device for a liquid heater. Background technique [0002] The existing temperature and safety control device of the liquid heater includes a DC power supply installed in the casing to provide a DC working voltage, a key switch arranged on the casing, a fan installed in the casing, and a first temperature sensor of the fan. And the circuit board located in the housing; the circuit board is provided with a key switch circuit, a first temperature sensor circuit, a fan switch circuit and a heater switch circuit, and the key switch is electrically connected to the key switch circuit; the first temperature sensor will The signal is input into the first temperature sensor circuit. It only controls the operation of the heating switch circuit through the temperature sensed by the first temperature sensor of the fan. Although it can sense whether there is a kettle, it cannot sense whether there is water ...

AI Technical Summary

Problems solved by technology

It only controls the operation of the heating switch circuit through the temperature sensed by the first temperature sensor of the fan. Although it can sense whether there is a kettle, it cannot sense whether there is water in the kettle, and there will be a problem of dry heating. Controlling the temperature and safety The method is single, the safety performance is poor, and the liquid heater is easily damaged

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