Detailed analysis of the advantages of peristaltic pumps and

Writer： admin Time：2022-01-21 16:44:22 Browse：632℃

The advantages of peristaltic pumps: To discuss the advantages of peristaltic pumps and the disadvantages of peristaltic pumps, we need to first understand the basic principles of peristaltic pumps and the origin of the name of the peristaltic pumps. Principle of peristaltic pump: The mechanical principle of peristaltic pump is very simple. It pumps fluid by alternately squeezing and releasing the pump tube. Just like using two fingers to squeeze a hose filled with liquid, with the movement of the fingers, negative pressure is formed at the inlet end of the pump tube, and the liquid in the pump tube flows along with it, and the liquid will flow out of the outlet end of the pump tube.

  The origin of the name of the peristaltic pump: Peristaltic pump, translated as "peristaltic pumps" in English, literally understood as the regular undulating motion similar to crawling arthropods. The pump tube of the peristaltic pump is compressed and displaced by the pressure roller during the working process. With the displacement of the pressure roller, the pump tube that is not compressed by the runner will rebound naturally. This process is a peristaltic process. This peristaltic process pushes out the substance in the pump tube, and therefore produces a pumping effect. This is where the name of the peristaltic pump comes from. Because of this principle of peristaltic pump, Qili peristaltic pump has the following advantages:

 1. Clean and pollution-free: the fluid only passes through and touches the peristaltic pump hose. Because the transported material only touches the hose of the peristaltic pump, the peristaltic pump tube used in the peristaltic pump meets the clean certification standards such as GMP, USP Class VI, FDA, and NSF. It does not contain various toxic and harmful substances. At the same time, it is soft. The tube can be easily replaced and disinfected. The disinfection method can be ethylene oxide (ETO), radiation, 2.5Mrad gamma sterilization, and the sterilizer can be repeatedly sterilized by high temperature and high pressure depending on the pump tube.

 2. Constant flow, high precision, adjustable flow: high repeatability, strong stability, and convenient flow adjustment. Since the volume pumped out by the peristaltic pump is constant per revolution, the reproducibility of the discharged liquid can reach up to five thousandths, and in general, it can reach plus or minus one percent. Constant peristaltic pump is also called constant flow pump. Under the condition of constant flow and high precision, the peristaltic pump can easily adjust and calibrate the flow by changing the speed of the pump.

 3. Low shear force: It is an ideal tool for conveying shear-sensitive and corrosive fluids. The low shear force is mainly aimed at other conventional pumps such as impeller pumps and mechanical pumps, such as centrifugal pumps. When the impeller is running, it will form a shear force on the liquid. For some liquids containing solids, this shear Shear force can cause fatal damage to solid objects.

4. Corrosion resistance: It can transport various fluids, such as organic solvents and corrosive liquids. Some corrosive liquids can invade and decompose and damage mechanical pumps such as impeller pumps, while peristaltic pumps can replace pump tubes of different materials to transport different liquids, such as organic solvents such as strong water and sulfuric acid.

5. Can run dry and run dry: the peristaltic pump can run dry for a long time, without water, can also transport air, gas-liquid-solid three-phase mixed transport. When the peristaltic pump is running, the maximum speed is mostly within 600 rpm, and the air will not produce too high temperature even when the air is delivered, and will not damage the pump body. Therefore, the peristaltic pump can mix air, liquid, solid-liquid, and gas-liquid-solid 3-phase mixing. delivery.

6. Possess self-priming ability: self-priming, no need to fill pump, no need to empty. Due to the principle of the peristaltic pump, the pump wheel will compress the pump tube, and the liquid will generate negative pressure at the inlet end of the pump tube during the displacement of the pump wheel to suck the liquid. Therefore, the peristaltic pump can self-prime without the need for pumping and emptying. The height of the suction stroke varies with the hardness of the pump tube, and can reach 5 meters, 8 meters or even higher water column suction capacity.

7. Stop valve function, no siphon, no seals: specific and good sealing, with stop valve and one-way valve functions. The runner of the peristaltic pump will always have the pump wheel to compress the pump tube during the working process, so the liquid will only flow in the direction of the runner movement and will not flow back to form a one-way valve function. When the pump stops working, the liquid will not Reverse flow and siphon thus function as a shut-off valve. The peristaltic pump therefore does not require any mechanical seals.

8. Two-way conveying function: As long as the direction of the pump wheel is changed, the reverse suction and back suction functions can be realized. The peristaltic pump produces pumping during the squeezing displacement of the runner, so the direction of rotation of the runner can be easily changed, so that the pumping direction can be changed easily.

9. Simple maintenance: only need to replace the peristaltic pump hose, no valve and seal replacement. Because the Yoorain peristaltic pump does not have these valves and seals, the structure of the peristaltic pump is also very simple and reliable, so there is no need for special maintenance except for the replacement of the pump tube.

 

10. Can withstand higher temperatures: The pump tube used for peristaltic pump transportation can maintain resilience at a high temperature of 100 degrees Celsius, so the peristaltic pump can also deliver high-temperature liquids continuously and for a long time.

The above are some obvious advantages of peristaltic pumps. Due to the principles and characteristics of peristaltic pumps, peristaltic pumps also have some disadvantages:

1. The peristaltic pump generates pulses.

During the pumping process of the peristaltic pump, because the rollers need to be released alternately, there will be a liquid suck back at the moment of release, which will cause a sudden decrease in the discharged liquid, which will cause the peristaltic pump to handle the pulse. There are two methods to solve the pulse problem of the peristaltic pump. One is to use double pump heads to install the roller angle in a staggered way to realize the natural cancellation of the pulse; the other is to use a pulse damper.

2. The peristaltic pump tube is a vulnerable part;

The pump tube of the peristaltic pump needs to be continuously squeezed by the runner during operation, so the pump tube is prone to aging, losing elasticity or being damaged under continuous working conditions. Normally, the life of ordinary silicone pump tubes is about 200 hours when the runner is continuously running at 100 rpm, and the life of some imported thermoplastic elastomer pump tubes can reach more than 2000 hours. Therefore, if the pump tube requires a long-term operation of the peristaltic pump or rarely replaces the pump tube, it is necessary to reduce the speed of the peristaltic pump as much as possible or choose a peristaltic pump tube with a longer life.

3. The pressure of the peristaltic pump is actually not a disadvantage;

I often hear that some peristaltic pump manufacturers say that the pressure produced by the peristaltic pump is low, or that the peristaltic pump cannot produce high pressure. In fact, this statement is not completely correct. It is true that most of the peristaltic pumps produced by these manufacturers can only work within a pressure of 3KG, 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 nuclear power of the specially designed and manufactured peristaltic pump can be achieved. 6KG or higher pressure.

Summary: The peristaltic pump is a relatively special pump product. The main advantage is that it can accurately deliver and quantitatively deliver 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 correctly understood and applied correctly.