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The Basics of Peristaltic Pumps

1. What is a peristaltic pump?


We believe that most of the users are not very familiar with this kind of pump. Peristaltic pump, also known as hose pump, is a new type of industrial pump, it is a product of modern industrial development, widely used in pharmaceutical, food, chemical and other industries, conveying some sensitive, viscous, strong corrosive, grinding, high purity requirements and contain certain granular material media.


2. The peristaltic pump structure composition


Peristaltic pump consists of three parts: driver, pump head and hose. The fluid is isolated in the pump tube, the pump tube can be quickly replaced, the fluid can be retrograde, dry running, low maintenance costs, and other features constitute the main competitive advantage of the peristaltic pump.


3. The working principle of peristaltic pump


Peristaltic pump mainly consists of a driver, hose 1, mounted on the rotor 3 roller 2 and housing. In these components, hose 1 made of flexible materials such as rubber or plastic, the rest are rigid metal parts. Peristaltic pump action is gentle and suitable for fluids that are not resistant to shear. The simple and reliable structure of this pump is also ideal for pumping medium flow, medium pressure of abrasive, fragile and corrosive fluids. They are also simple to maintain as only the hose is in contact with the fluid.


The peristaltic pump works by utilizing a soft elastomer tube that withstands deformation and returns to its original shape. Peristaltic pump is like squeezing a hose filled with fluid with a finger, as the finger slides forward the fluid inside the tube moves forward. Peristaltic pump is also this principle only by the roller instead of the finger. By alternately squeezing and releasing the flexible delivery hose of the pump to pump the fluid. Like squeezing a hose with two fingers, with the movement of the fingers, the tube to form a negative pressure, the fluid flow.


Peristaltic pump is a section of the pump tube between the two rotary rollers to form a "pillow" shaped fluid. The volume of the "pillow" depends on the inner diameter of the pump tube and the geometric characteristics of the rotor. The flow rate depends on the pump head speed and the "pillow" size, the number of "pillows" generated by each revolution of the rotor, the product of three parameters. The size of the "pillow" is generally a constant (except when pumping particularly viscous fluids).


Compared with the same rotor diameter pump, produce a larger "pillow" volume of the pump, the volume of fluid delivered per rotation of the rotor is also larger, but the degree of pulsation generated is also larger. This is similar to the case of membrane valves. The pump that produces a smaller "pillow" volume, its rotor per revolution of the volume of fluid delivered is also smaller; moreover, the rapid, continuous formation of small "pillow" so that the fluid flow is smoother. This is similar to the way the gear pump works.