Switching device for instant electric water heater

Abstract

The invention discloses a switching device for an instant electric water heater. The switching device comprises a control board, a microswitch, a first drive part, a first compression spring, a water cavity and an electromagnetic valve arranged on a water-in pipeline of the water heater, wherein a diaphragm is arranged on one side of the water cavity; a water-in pipeline between the electromagnetic valve and a liner water-in end of the water heater is communicated with the water cavity through a first channel and a second channel; a hydroelectric switch is arranged on the first channel; the hydroelectric switch sends a first signal to the control board when closing the first channel; after receiving the first signal, the control board opens the electromagnetic valve, water enters the liner and the water cavity, the diaphragm deforms and drives the first drive part to trigger a contact of the microswitch, and the microswitch turns on the power supply of an electric heating pipe; the hydroelectric switch sends a second signal to the control board when connecting the first channel, the water cavity releases pressure, and the microswitch turns off the power supply of the electric heating pipe; and after receiving the second signal, the control board delays the set time and closes the electromagnetic valve. The switching device disclosed by the invention has the advantages of water turnoff delaying, high working reliability and low production cost.

Description

technical field [0001] The invention relates to the technical field of electric water heater manufacturing, in particular to a switch device applied to instant thermoelectric water heaters. Background technique [0002] The existing instant thermal electric water heater has a small inner tank volume and a large heating power of the electric heating tube, so if the water is turned on again immediately after the water is turned off, the outlet water temperature will be very high, which is easy to burn people. [0003] In order to avoid scalding people when the water comes out, most of the current instant electric water heaters are equipped with a delay water shut-off control device. One of the existing delay water shut-off control devices is a mechanical control structure. Although its manufacturing cost is relatively low, it must achieve delay The water shut-off function has a complex structure, low reliability, and low accuracy of delay time control; the other is a control s...

AI Technical Summary

Problems solved by technology

[0002] The existing instant electric water heater has a small inner tank volume and a large heating power of the electric heating tube, so if the water is turned on again immediately after the water is turned off, the outlet water temperature will be very high, which is easy to burn people

[0003] In order to avoid scalding people when the water comes out, most of the current instant electric water heaters are equipped with a delayed water shut-off control device. One of the existing delayed water shut-off control devices is a mechanical control structure. Although its manufacturing cost is relatively low, it must achieve a delay The water shut-off function has a complex structure, low reliability, and low accuracy of delay time control; the other is a control structure that combines a circuit controller with a solenoid valve and a micro switch, and the delay time control of this structure is more complex. Accurate, work reliability can also meet the requirements, but the manufacturing cost of the circuit controller is relatively high

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