AC-DC dual-purpose high-power electric water heater

Abstract

The present invention provides an AC-DC dual-purpose high-power electric water heater. The AC-DC dual-purpose high-power electric water heater is composed of two portions including an electric water heater basic device and a control device. The electric water heater has the structure that a water heater inner container and an inner container seal cover are disposed in a cylindrical heat insulation electric water heater housing, an electric heating pipe, a temperature controller and a snap action temperature limiter are disposed in the inner container, a lower part of the housing is provided with a water inlet, a water outlet and a sewage draining exit, and the front side of the water heater housing is provided with a heating indicating lamp and a temperature display. The control device is installed between the inside of a side cover of the water heater and the inner container seal cover, the snap action temperature limiter, the temperature controller, a DC operation relay and a filtering rectifier are disposed in the control device, on and off of the electric heating pipe are controlled by the DC operation relay, and a power line stretches out of the cylindrical housing and is electrically connected with a power plug. The electric water heater is AC-DC dual-purpose, and on and off of the electric heating pipe are controlled by the DC operation relay without arc discharge. The electric water heater is suitable for office and household use, and especially suitable for DC photovoltaic power generation household use.

Description

technical field [0001] The invention relates to an electric water heater, in particular to an electric water heater with both AC and DC functions. Background technique [0002] At present, the known electric water heaters are all powered by 220V alternating current. In order to save energy and protect the environment, the relevant units have gradually promoted my patent. "Used photovoltaic power generation", DC voltage 220V, high-power household appliances, when powered by DC, when the switch is opened and pulled off, the arc will be drawn, causing the switch contacts to burn or stick. I solved it with a 220V DC operating relay. arcing problem, and applied for a patent (ZL201520169187.8), but when the direct-use photovoltaic power generation is insufficient, it needs to be powered by AC power. When the power plug of the photovoltaic DC water heater is plugged into 220V AC, when the thermostat is turned on, It was found that the DC operation relay was not magnetically enough...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the 220V DC operating relay cannot work due to insufficient magnetism and the 220V AC relay will burn out in 220V DC when it is used in 220V DC, the present invention provides a method that does not require any manual switching on the electric water heater. Directly plugged into the AC or DC power socket, realizing AC and DC dual-use

The control device is installed in the side cover of the water heater shell and between the sealing cover of the liner. There are sudden jump temperature limiter, temperature controller and DC operation relay inside. A bridge type is added between the temperature controller and the DC operation relay. The rectifier circuit solves the dual-use problem of AC and DC very conveniently without conversion. In order to suppress the noise generated by the DC operation relay when it is used in AC, a line filter circuit is added, and the two are combined to form a filter rectifier. One wire is connected to the positive pole of the filter rectifier output through the sudden jump temperature limiter, the other is connected to one end of the DC operation relay coil, the other end of the DC operation relay coil is connected to the negative pole of the filter rectifier, and the electrode of the electric water heater socket. In addition to supplying the filter rectifier circuit, it is also electrically connected to half of the A and D contacts of the AB and DE contacts of the DC operation relay, and the other half of the B and E contacts are electrically connected to the heating tube, and the DC operation relay coil is controlled by a thermostat and a sudden temperature limiter. On and off, so as to control the on and off of the heating tube, and do not pull the arc in the use of direct current

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