An electric water heater with voltage induction leakage protection and its alarm method

Abstract

The invention provides an electric water heater with voltage induction leakage protection and an alarm method thereof, wherein the electric water heater includes a power board and a controller for controlling the power supply channel of the power board, and also includes a controller for sensing the leakage voltage on the pipeline and / or shell of the electric water heater A voltage-inductive alarm device for electric field strength, the voltage-inductive alarm device is electrically connected to the controller so as to transmit leakage signals to it. The present invention adopts the voltage induction detection, without physical contact, can monitor the safety of the electric water heater, and then cut off the power supply quickly and in time when the leakage occurs, so as to solve the accidents of frequent electric shocks and injuries to people that have been used to prevent the electric wall, and put an end to the water heater Electric shock hurts people.

Description

technical field [0001] The invention relates to leakage protection of electric water heaters, in particular to an electric water heater with voltage induction leakage protection and an alarm method thereof. Background technique [0002] For electric water heaters, if there is irregular electricity consumption, poor ground wires, electrified ground wires, leakage of external equipment such as booster pumps to electric water heaters, aging and damaged internal wires, poor installation, aging or damage to electric heating pipes or various electrical components And so on, may lead to electric water heater leakage, endangering the safety of users. [0003] But existing electric water heater, except grounding, generally only carries out electric leakage protection by anti-electricity wall or current mutual inductance detection. [0004] For the anti-electric wall scheme, the conventional method is to add an anti-electric wall on the water inlet and outlet of the electric water he...

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Problems solved by technology

[0004] For the anti-electric wall scheme, the conventional method is to add an anti-electric wall on the water inlet and outlet of the electric water heater, use the anti-electric wall to extend the length of the waterway, and realize leakage protection based on the attenuation characteristics of water resistance. Charged, there is no protection for electric water heater casings caused by poor ground wires, charged ground wires, internal wire damage, aging and damaged electrical components, or other reasons.

[0005] For the current mutual inductance detection scheme, the method is to use the current transformer to be set on the water inlet and outlet pipes, and use the principle of electromagnetic induction to detect whether there is current flowing in the pipe, and when it flows, a signal is sent to the electric water heater controller, and the controller Cut off the power supply of the power board to achieve protection. The defect of this solution is that the current transformer needs to realize the current induction conversion from the primary side to the secondary side through the coil, so the structure is limited to a ring, and it needs to be placed on the pipeline before it can be used. As a result, it can only detect internal The electrification of the pipeline caused by the electrification of the tank or the water body cannot detect the electrification of the casing. In addition, the current mutual inductance detection scheme needs to rely on the inductance coil to detect the current, which is costly and has no advantage in cost control.

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