Electric water heater with control circuit board externally arranged

Abstract

The invention discloses an electric water heater with a control circuit board externally arranged. The electric water heater comprises an electric water heater body (10), a plug (12), a key display panel (13), a heating pipe (14) and a water flow sensor (15); the electric water heater body (10) is provided with a water inlet pipe and a water outlet pipe, the water flow sensor (15) is arranged on the water inlet pipe or the water outlet pipe, the heating pipe (14) and the key display panel (13) are arranged on the electric water heater body (10), and the plug (12) is provided with a power supply pin (121); and the electric water heater is characterized by further comprising the control circuit board (11), the control circuit board (11) is arranged outside the electric water heater body (10), the control circuit board (11) is provided with a controller (110) and a relay (112), the relay (112) is provided with an input end, an output end and a control end, the input end of the relay (112)is electrically connected with the power supply pin (121), the output end of the relay (112) is electrically connected with the heating pipe (14), and the controller (110) is connected with the waterflow sensor (15), the key display panel (13) and the control end of the relay (112). The electric water heater has the advantage that the effect of safe and convenient use is effectively realized.

Description

technical field [0001] The invention relates to the technical field of water heaters, in particular to an electric water heater with an external control circuit board. Background technique [0002] An electric water heater refers to a water heater that uses electricity as an energy source for heating. It is one of the three major water heaters juxtaposed with gas water heaters and solar water heaters. According to the heating power, electric water heaters can be divided into three types: water storage type (also known as volumetric or heat storage type), instant heating type, and rapid heating type (also known as semi-water storage type). [0003] In terms of electric water heaters, users are most concerned about safety issues. How to prevent leakage has become the most important consideration for merchants. The most basic leakage prevention device is the leakage protector built into the water heater. In addition, there are anti-electricity walls, water and electricity Sep...

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Problems solved by technology

[0005] When the inventor implemented the present invention, he found that even if the above-mentioned product is used, the relay is disconnected so that the heating tube is not charged, but because the wire connected between the plug and the control circuit board is still connected to the mains, it is still possible that the electric water heater Insulation failure factors, there is a strong electric leakage phenomenon, which will cause electric shock hazard to the human body

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