Liquid level sensing device and electrical equipment with water tank

Abstract

The invention discloses a liquid level sensing device and electrical equipment with a water tank. The liquid level sensing device is used for detecting level of the water tank and comprises a shell, a light emitting tube and a light receiving tube, wherein the light emitting tube and the light receiving tube are positioned by the shell, the shell is fixed on the outer side of the water tank, light-transmitting projections are arranged at positions, corresponding to the light emitting tube and the light receiving tube, on the inner wall of the water tank, and a water tank position sensing switch is arranged on the outer side of the water tank. When water level is higher than the projections, light emitted from the light emitting tube is projected into water directly, and no light can be received by the light receiving tube. When the water level is lower than the projections, light emitted from the light emitting tube is reflected totally on the interface of the projections and the air so as to arrive at the light receiving tube, and then, the light receiving tube can send an alarm signal. When the whole water tank is removed, the water tank position sensing switch can send signals to indicate the electrical equipment to stop working, so that accidents such as burning-out can be avoided.

Description

technical field [0001] The invention relates to the technical field of liquid level sensing devices, more specifically, to a separated liquid level sensing device with more accurate signals, and electrical equipment with a water tank. Background technique [0002] People have made liquid level sensors based on the principle of reflection and refraction when light passes through the interface between two different media. A liquid level sensor in the prior art usually includes a light source, a light receiver, a light path and a measuring probe. Wherein the measuring probe is located in the water tank and is directly in contact with the water. The working principle of this liquid level sensor is such that when the measured liquid is higher than the position of the liquid level sensor, the light will directly shoot into the water, and no light will reach the receiving tube. And when the liquid to be measured is lower than the position of the liquid level sensor, the light wil...

AI Technical Summary

Problems solved by technology

Because the liquid level sensor in the prior art is integrated with the water tank, it is not only inconvenient for the user to operate the water tank, but also cannot accurately sense the change of the position of the water tank

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