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How does a flow switch operate?

Views: 0     Author: Site Editor     Publish Time: 2021-11-08      Origin: Site

How does a flow switch operate?

The flow switch is mainly installed in water, oil and other liquids or plug-in medium pipes to monitor the water flow in the water supply system. At this time, when the water flow is higher or lower than a set point in time, the device will send the output alarm signal to the device, and the system will make the corresponding indication action after obtaining the signal, so as to avoid or reduce the "dry burning" of the host. Its unique streamlined structure design, accurate and stable performance, is widely used in pipeline flow monitoring and large, medium and small equipment cooling and lubrication system.

Here is the content list:

l Working principle of flow switch

l Internal structure

Working principle of flow switch

When there is water flow in the water flow switch and the water flow is ≥ 1.0L/min, the magnetic core in the switch is driven by the flow to produce displacement, and the magnetic core displacement drives the magnetic source to produce magnetic control, which makes the flow switch output the "pass" signal. The automatic selection of the flow switch is included. The signal is inputted into the control system of the equipment, and the control function is realized by the control system. When the water flow is less than the starting flow, the flow switch outputs the "off" signal. The control system produces the opposite control effect. In other words: water flow switch when the water flow in the pipeline is greater than the 1L/min flow, the magnetic core produces displacement under the action of water flow and drives the magnetic source to produce magnetic control action to make the sensor output "1" switch signal, which is input to the equipment control system, and the purpose of water flow control is realized after power expansion and amplification. When the water flow in the pipeline is less than the 1L/min flow, the magnetic core drives the magnetic source back under the action of the reset spring thrust, which makes the sensor output the "0" switch signal and stop the work of the system. It has the advantages of high sensitivity and strong durability.

Internal structure

The fluid channel inside the flow switch housing is provided with a piston with a permanent magnet inside. When the piston is driven by the pressure difference caused by the liquid flow, the magnetic piston will cause the sealed Reed switch inside the equipment to act, and the diameter of the piston determines the starting flow. When the liquid flow decreases, the stainless steel spring pushes the piston to reset. After the Reed switch is turned on, the alarm or indication can be transmitted remotely, or it can be integrated into the automatic control system. Set the upper or lower limit for the flow switch, when the flow reaches this limit, the switch sends a signal or alarm, and the system will run or stop. According to the different systems, as well as the flow switch model and other factors, the place of use is also different, depending on the specific situation.

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