Effect of selection of peristaltic pump head on flow and pulse

The peristaltic pump is also called a hose pump. The mechanical principle of the peristaltic pump is to use the rotor to squeeze and release the hose alternately and repeatedly to pump fluid. The hose is clamped between the mechanical rotor and the stator to achieve the purpose of pumping. When the peristaltic pump is working, a section of pump tube between the two rollers will form a pump chamber. The size of the pump chamber depends on the inner diameter of the pump tube and the size of the rotor. The theoretical flow rate of a peristaltic pump is the volume of the pump chamber. For example, if two pumps have the same rotation diameter, the pump with a larger pump chamber will transport a larger volume of fluid per revolution of the rotor, but the pulse generated will also be larger. . On the contrary, a pump that produces a smaller pump chamber will transport a smaller volume of fluid per revolution of the rotor and produce smaller pulses, but rapid and continuous pumping can ideally reduce pulses, so in some small In situations where the flow rate and pulse requirements are very small, the selection of the pump head is very critical.

The wheels on the rotor run over the pump tubes in turn, pushing the fluid in the tubes forward. After being run over by the runner, the pump tube returns to its original shape due to its own elasticity, forming a vacuum at the suction end of the pump tube, and the liquid is sucked in due to the vacuum.

There is a distance between the rotating rollers, and this distance will make the pump pipe form a closed space, that is, the pump chamber. The volume of the pump chamber is related to the inner diameter of the pump pipe, the rotation diameter and the wheel base of the runner. The flow rate is determined by the speed of the roller on the pump head multiplied by the size of the pump chamber.