Washing machine and washing agent liquid level detection device used for washing machine

Abstract

The invention discloses a washing machine and a washing agent liquid level detection device used for the washing machine. The washing machine comprises a washing agent storage box, the washing agent storage box is provided with a U-shaped tank, one side of the U-shaped tank is used for the placement of the washing agent, the other side of the U-shaped tank forms an enclosed gas chamber, and the enclosed gas chamber is provided with a guiding nozzle. The washing agent liquid level detection device comprises a water level sensor and a liquid level detection unit. The pressure sensing end of the water level sensor is connected to the guiding nozzle through a gas return pipe, and the water level sensor outputs inductance signals by sensing the air pressure change condition in the enclosed gas chamber; The liquid level detection unit is used for identifying the inductance signals in order to detect the liquid level of the washing agent in the washing agent storage box. The washing machine and washing agent liquid level detection device does not need to make contact with the washing agent, and can detect the liquid level of the washing agent accurately and reliably by means of the water level sensor which senses the air pressure change in the enclosed gas chamber in the U-shaped tank of the washing agent storage box, the phenomenon that because the washing agent is retained on the wall or is partially concentrated and hardened, the detected liquid level of the washing agent is not accurate can be avoided, and the cost is relatively low.

Description

technical field [0001] The invention relates to the technical field of washing machines, in particular to a detergent liquid level detection device for washing machines and a washing machine. Background technique [0002] For a washing machine with the function of automatically feeding detergent, it is necessary to detect the liquid level of detergent. [0003] In the related art, there are generally two ways to detect the liquid level of detergent, that is, a float switch way or a probe way. Wherein, the float switch method is to set a column in the detergent storage box, and the float switch is sleeved on the column, and the float switch will float up and down with the change of the liquid level. At the same time, a dry reed switch is set in the float switch, and a magnet is set at a specific liquid level of the detergent storage box. When the float switch moves up and down with the liquid level change, the dry reed switch will be closed when the float switch is close to ...

AI Technical Summary

Problems solved by technology

However, this method not only requires the controller to provide an isolated +12V voltage, which is costly, but also requires the detergent to be used as a conductive carrier. If the detergent is stored in the storage box for a long time and is not used, the detergent may be partially hardened, thereby The detected detergent liquid level is quite different from the actual liquid level

[0005] In summary, the above two detergent liquid level detection methods may cause liquid level misjudgment

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