Impeller type waterflow detection way for water pump, waterflow switch and water pump

Abstract

The invention belongs to the technical field of water pumps, in particular to an impeller type waterflow detection way for a water pump, a waterflow switch and the water pump. Through comparing a pulse width value L with an effective pulse width minimum value Lmin and an effective pulse width maximum value Lmax, when no water flows by, the width, formed by occasional front and back actions, of animpeller is more than a pulse signal of the effective pulse width maximum value Lmax, and thus, the situation that the water does not flow by is determined; and the width is less than an interferencepulse signal of the effective pulse width minimum value Lmin, and thus, the situation that the water does not flow by is determined; a no-pulse time setting value T is set, and a no-pulse timer t is more than or equal to the no-pulse time setting value T, and thus, the situation that the water does not flow by is determined; and meanwhile, an effective pulse number setting value N is set, and theeffective pulse number n is more than or equal to the effective pulse number setting value N, and thus, the situation that the water flows by is determined. According to the impeller type waterflow detection way disclosed by the invention, the misjudgment situations can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of water pumps, and in particular relates to an impeller-type water flow detection method, a water flow switch and a water pump. Background technique [0002] The automatic water pump currently on the market is mainly based on whether the user uses water to realize automatic boosting operation. When the user uses water, the water pump is turned on, and when the user stops using water, the water pump is turned off. [0003] The water flow switch is a switch-type sensor component. When water flows through the water pipe, the water flow switch acts to send a signal to the control board, and the control board performs some corresponding actions, such as controlling the operation of the water pump and increasing the water pressure for the water pipe. [0004] Chinese utility model patent CN103148908A discloses a bidirectional metering type water flow switch capable of bidirectional metering. Hall elements are arr...

AI Technical Summary

Problems solved by technology

[0006] 1. Even if there is no water flowing, the impeller will occasionally move back and forth, causing the Hall element to sense the change in the magnetic field and output a corresponding pulse signal, resulting in misjudgment;

[0007] 2. External electromagnetic interference will cause the Hall element to output interference pulses. Usually, a filter capacitor is connected to reduce interference. However, when the external electromagnetic interference is strong, the filter capacitor cannot eliminate all interference pulses, and there will still be interference pulse output, resulting in Misjudgment

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