To discuss the advantages and disadvantages of peristaltic pumps, you need to start by understanding the basic principles of peristaltic pumps and the origin of peristaltic pump names.
The origin of the name of the peristaltic pump: the peristaltic pump, translated in English as "peristalticpumps", is literally understood as a regular undulating motion similar to a crawling arthropod. The pump tube of the peristaltic pump is pressed and displaced by the pressing wheel during the working process. With the displacement of the pressing wheel, the pump tube that is not compressed by the rotating wheel will naturally rebound. This process is a creeping process. This peristaltic process pushes out the material in the pump tube, thus producing a pumping effect, and the name of the peristaltic pump is thus derived.
Peristaltic pump principle: The mechanical principle of the peristaltic pump is very simple. It pumps fluid by alternately squeezing and releasing the pump tubing. Just like using two fingers to squeeze a hose filled with liquid, as the finger moves, a negative pressure is formed at the inlet end of the pump tube, the liquid in the pump tube flows, and the liquid at the outlet end of the pump tube flows out.
Because of this principle of peristaltic pumps, peristaltic pumps have the following advantages:
1, clean and pollution-free
The fluid only passes through and contacts the peristaltic pump hose. Because the delivered material only contacts the hose of the peristaltic pump, the peristaltic pump tube used in the peristaltic pump meets the clean certification standards of GMP, USP Class VI, FDA and NSF, does not contain all kinds of toxic and harmful substances, and because the hose can It is easy to be replaced and disinfected. The disinfection method can be made by using ethylene oxide (ETO), ray, 2.5Mrad gamma sterilization, sterilizing pot and repeated high temperature and high pressure sterilization depending on the pump tube.
2, constant current, high precision, adjustable flow
High repeatability, strong stability and easy flow adjustment. Since the volume pumped by the peristaltic pump is constant every revolution, the liquid reproducible accuracy can reach up to five thousandths, and the normal situation can reach plus or minus one percent, so the peristalsis The pump is also called a constant current pump. The peristaltic pump can easily adjust and calibrate the flow rate by changing the speed of the pump under constant current and high precision.
3, low shear force
It is the ideal tool for conveying shear sensitive and aggressive fluids. The low shear force is mainly for other conventional pumps such as impeller pumps and mechanical pumps, such as centrifugal pumps, which form shear forces on the liquid when the impeller is running. For some liquids containing solids, the shear The shear force can cause fatal damage to solids.
4, corrosion resistance
It can transport various fluids such as organic solvents and corrosive liquids. Some corrosive liquids can invade and decompose damage to mechanical pumps such as impeller pumps, while peristaltic pumps can replace pump tubes of different materials to deliver different liquid types, such as strong water, sulfuric acid and other organic solvents.
5, can be idling, dry running
The peristaltic pump can be operated for a long time, without water, and can also transport air, gas-liquid-solid three-phase mixing and conveying. When the peristaltic pump is running, the maximum speed is mostly within 600 rpm. The instantaneous delivery of air will not produce excessive temperature and will not damage the pump body. The peristaltic pump can therefore be mixed with air, liquid, solid-liquid mixture and gas-liquid solid phase. delivery.
6, with self-priming ability
It can be self-priming, no need to pump, no need to empty. Due to the principle of the peristaltic pump, the pump wheel will press the pump tube, and the liquid will generate a negative pressure at the inlet end of the pump tube in the displacement of the pump wheel to suck in the liquid, so the peristaltic pump can self-prime without pumping and emptying. The height of the suction stroke varies with the hardness of the pump tube, and can reach the water column suction capacity of 5 meters, 8 meters or even higher.
7, shut-off valve function, no siphon, no seals
Specific good sealing, with shut-off valve and check valve function. The runner of the peristaltic pump always has the pump wheel pressing the pump tube during the working process, so the liquid will only flow in the direction of the movement of the runner, and will not reverse the flow to form the one-way valve function. When the pump stops working, the liquid will not Backflow and siphoning thus function as a shut-off valve. The peristaltic pump therefore does not require any mechanical seals.
8, two-way conveying function
The reverse pumping and suckback function can be realized by changing the direction of the pump runner. The peristaltic pump generates pumping at the displacement of the runner, so the direction of rotation of the runner can be easily changed, so that the pumping direction can be easily changed.
9, simple maintenance
Simply replace the peristaltic pump hose and replace the valve and seal. The peristaltic pump is simple and reliable because it does not have the structure of these valves and seals, and the peristaltic pump, so there is no need for special maintenance other than the need to replace the pump tube.
10, can withstand higher temperatures
The pump tube of the peristaltic pump can reach a maximum working temperature of 100 degrees Celsius. The pump tube for peristaltic pump delivery can maintain a resilience at a high temperature of 100 degrees Celsius, so the peristaltic pump can also deliver high temperature liquid continuously and for a long time.
The above are some of the obvious advantages of peristaltic pumps. Due to the principles and characteristics of peristaltic pumps, peristaltic pumps also have some disadvantages:
1, the peristaltic pump will produce a pulse
During the pumping process of the peristaltic pump, since the runner needs to be alternately released, a liquid back-feeding at the moment of release causes a sudden decrease in the discharged liquid, which causes a pulse transmitted by the peristaltic pump. There are two ways to solve the pulse of the peristaltic pump. One is to use a double pump head to displace the wheel angle to achieve natural pulse cancellation; the other is to use a pulse retarder.
2, peristaltic pump tube is a wearing part
The pump tube of the peristaltic pump needs to be continuously squeezed by the runner during operation, so the pump tube can easily lose its elasticity or breakage under continuous working conditions. Normally, the average silicone pump tube usually has a life of about 200 hours when the rotor is continuously operated at a speed of 100 rpm, and some imported thermoplastic elastomer pumps have a life of more than 2,000 hours. Therefore, if the pump tube needs a long-term operation of the peristaltic pump or if the pump tube is rarely replaced, it is necessary to reduce the rotational speed of the peristaltic pump as much as possible or to select a peristaltic pump tube with a longer life.
3, peristaltic pump pressure is actually not a disadvantage
I often hear that some peristaltic pump manufacturers say that the pressure generated by the peristaltic pump is low, or that the peristaltic pump cannot produce high pressure. In fact, this statement is not completely normal. It is true that most peristaltic pumps produced by these manufacturers can only work within 3KG pressure, but they may not have noticed that higher pressure peristaltic pumps exist. These high-pressure peristaltic pumps usually require special design and manufacturing. For example, the pump head needs higher strength, and the pump tube also needs higher hardness and resilience. The pressure can be up to 6KG through the specially designed and manufactured peristaltic pump. Or more stressful.
Summary: The peristaltic pump is a special pump product. The main advantage is that it can accurately transport and quantify variable transport liquids. These advantages and disadvantages of peristaltic pumps can be widely promoted and used in various applications and engineering projects as long as they are properly understood and applied correctly.
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