An impeller-type water flow detection method for a water pump, a water flow switch and a water pump

Abstract

The invention belongs to the technical field of water pumps, and in particular relates to an impeller-type water flow detection method for a water pump, a water flow switch and a water pump. min , the maximum effective pulse width L max For comparison, the width formed by the impeller's occasional front and rear movement when no water flows is greater than the maximum effective pulse width L max The pulse signal is judged as no water flowing, and the width is less than the minimum effective pulse width L min The interference pulse signal is judged as no water flowing; set the no-pulse time set value T, the no-pulse timer t is greater than or equal to the no-pulse time set value T, it is judged that no water flows; at the same time, set the effective pulse number set value N , the number of valid pulses n is greater than or equal to the set value of the number of valid pulses N, and it is determined that there is water flowing. The present invention can effectively avoid the occurrence of misjudgment.

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 of a water pump, a water flow switch and a water pump. Background technique [0002] The automatic water pumps currently on the market are mainly based on whether the user uses water to achieve automatic booster 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 there is water flowing through the water pipe, the water flow switch acts and sends 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 to the water pipe. [0004] Chinese utility model patent CN103148908A discloses a bidirectional metering water flow switch capable of bidirectional meterin...

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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