A working principle of peristaltic pump
The peristaltic pump is a liquid delivery device that can control the flow rate. It is common to repeatedly compress the elastic tube to move the contents of the tube in a certain direction, the flow rate of which is determined by the diameter of the tube and the compression speed. Used in liquid chromatography and perfusion systems.
principle:
The peristaltic pump is like squeezing a fluid-filled hose with your finger, and the fluid moves forward as the finger slides forward. The principle of the peristaltic pump is that the finger is replaced by the scroll wheel. The fluid is pumped by alternately squeezing and releasing the elastic delivery hose of the pump.
When the roller on the rotor presses through the pump tube, the fluid is thrown out. When the pump tube behind the roller returns to its shape, a vacuum is created and the fluid is sucked in.
The second peristaltic pump system consists of three parts: pump head, pump tube and driver.
When selecting a peristaltic pump, the following aspects should be considered:
1. Select the pump head
² Channel number selection-choose single or multi-channel to transport fluid
² Replacement and fixation of pump tubing-whether it is easy to replace the hose and whether it is easy to fix the hose
² Flow rate-different pump heads can achieve different flow rates
² Chemical compatibility-once the liquid in the pump tube splashes, it may corrode the pump head, so the choice of pump head material is very important
² Accuracy: The standard pump head can ensure the maximum accuracy and the highest reproducibility of the flow rate.
2. Select the pump tube
Conditions as peristaltic pump hose
² Has a certain elasticity, that is, the hose can quickly recover its shape after being compressed radially
² Has a certain wear resistance
² Ability to withstand certain pressure
² No leakage (good air tightness)
² Low adsorption, good temperature resistance, not easy to aging, no swelling, corrosion resistance, low precipitation, etc.
3. Select the drive
² Whether flow control is required;
² Whether liquid volume distribution is required;
² What is the size of the flow range;
² Whether the overall structure is reasonable and the operation is convenient;
² Whether the flow accuracy and liquid accuracy meet the requirements
² Special needs: protection grade, explosion-proof grade, etc.
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