Piston flowmeter

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1. What is the principle of piston type water flow switch and what is the use of magnetic switch?

The principle of piston key type water flow switch is to use the pressure difference principle, while the magnetic switch uses the water flow to drive the impeller to rotate, causing the magnetic steel induction Hall element on the impeller to perform flow counting.. Piston type water flow switch: Principle: The piston type reed cracking water flow switch is equipped with a piston inside. When water flows, a pressure difference will be generated on both sides of the piston. This pressure difference will push the piston to move, triggering the switch signal. When the water flow stops, the pressure difference disappears, the piston resets, and the switch signal changes accordingly. This principle enables the piston type water flow switch to accurately detect the flow state of water flow. Magnetic switch: Function: Magnetic switches are usually used for flow counting or flow monitoring. It contains an impeller and a Hall element inside. When water flows through, it will push the impeller to rotate. Working principle: The impeller is equipped with magnetic steel, which periodically approaches and moves away from the Hall element as the impeller rotates. Hall element is a sensor that can sense changes in magnetic field. When a magnet approaches, it outputs an electrical signal; When the magnet moves away, the signal disappears. In this way, by detecting the output signal of the Hall element, the number of rotations of the impeller can be calculated, and the flow rate of the water can be obtained. In summary, both piston type water flow switches and magnetic switches are important components for detecting water flo

2. What are the main classifications of flow meters? What are the measurement principles? Generally, there are four types of commonly used flow meters: ① mechanical flow meter, ② electromagnetic flow meter, ③ vortex flow meter, ④ ultrasonic flow meter. ① Mechanical flow meter: commonly known as water meter in daily life, the water meter has a rotating structure inside, and the flowing liquid will cause the structure of the internal fan to rotate. The flow rate and fan speed have a certain proportional relationship, and the faster the rotation speed, the greater the flow through the pipeline. At the same time, some mechanical flow meters can also generate pulse signals to represent flow signals and transmit them to PLC. Mechanical flow meters have mechanical moving parts inside, which are not suitable for sewage or liquids containing impurities such as solids and particles. Excessive impurities can block the fan blades and cause damage to the mechanical flow meter. ② Electromagnetic flowmeter: commonly used in the industrial field, the measured liquid must be water or a conductive liquid. Electromagnetic flowmeters have no moving parts, and their working principle is the same as that of the broad characters. It relies on the law of electromagnetic induction, which is Faradays formula: E=B × L × V (dynamic electromotive force). The flowmeter has two excitation coils on the top and bottom to generate a constant magnetic field B. In this way, the positive and negative charged particles in the fluid will receive the force of the magnetic field "Lorentz magnetic force" and separate. At the same time, the electrodes on both sides of the flow

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