Water level sensor

Abstract

The invention relates to a water level sensor, which comprises a base, a protecting cover arranged at the bottom of the base, a seal disc in seal connection with the inner wall of the base, a magnetic core of which the lower part abuts against the seal disc, a hollow support arranged at the upper part of the base, a capacitor, an inductance coil and a spring arranged in the cavity of the hollow support, wherein the hollow support comprises a hollow first support and a second support which is arranged at the periphery of the first support and fixedly connected with the base; the first support and the second support are connected through a thread; the axial line extension direction of the thread is consistent with the vertical direction; and the inductance coil and the capacitor are both fixed on the first support. The vertical distance between the inductance coil and the magnetic core can be changed by spiral advancing and regressing of the first support and the second support in the invention, thus reducing the resonance frequency of the overall LC (inductance-capacitance) circuit of the sensor and ensuring the initial resonance frequency to be adjustable, further reducing the product rejection rate, reducing production cost and improving production efficiency and economic benefit.

Description

technical field [0001] The invention relates to a water level sensor. Background technique [0002] The working principle of the water level sensor is: the water level sensor transmits the sensed water level signal to the controller, and the computer in the controller compares the measured water level signal with the set signal to obtain the deviation, and then according to the nature of the deviation, send water to the electric motor The valve sends "open" and "close" commands to ensure that the set water level is reached in the container. [0003] like figure 1 Shown is a water level sensor for a washing machine, which consists of an outer ring 1', a cover 2' with an air inlet nozzle 20', a sealing disc 3', a base 4', a magnetic core 5', a capacitor 6', an inductance Coil 7', spring 8', screw 9' and support 10' and other parts. When the sensor works, the air intake nozzle 20' on the protective cover 2' is connected to the air chamber of the bucket of the washing machine...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the prior art, the accuracy of the water level sensor is affected by the processing accuracy of the capacitance, inductance coil and magnetic core, etc. When there is a deviation between the resonant frequency and the standard value, the initial resonant frequency cannot be adjusted and can only be scrapped. An improved water level sensor is provided with an adjustable initial resonant frequency and higher water level acquisition accuracy.

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