Peristaltic pump outlet dripping phenomenon: When we use it, when the peristaltic pump stops, it is usually hoped that the liquid in the pipeline will stop flowing immediately as the pump stops. However, we often find the pipeline. The liquid in the liquid will slowly drip down until the liquid in the drooping pipe drops and stops flowing. This is a big problem when we use a peristaltic pump as a quantitative tool. How did this dripping phenomenon occur? The peristaltic pump engineer will tell you that this is a normal liquid flow phenomenon, mainly because the liquid is filled in the drooping outlet line when it is working, but when the pump stops, the pipe outlet Due to its own gravity and the ductility of the liquid, the liquid will naturally drip down the exit edge until the liquid in the drooping tube is completely dripped.
In addition to the above-mentioned liquid self-weight drop, will the peristaltic pump produce a siphon phenomenon? the answer is negative. Because the working reason of the peristaltic pump determines that the reciprocating pump needs to completely press the pump tube during the working process, the negative pressure can be generated at the inlet end and the positive pressure at the outlet end. Therefore, when the peristaltic pump is stopped, the inlet and outlet are completely shut off. Therefore, although the outlet pipe is drooping, the entire peristaltic pump hose does not cause siphoning.
After we know the cause of the dripping of the liquid in the peristaltic pump outlet line, what should we do?
The answer and analysis of the peristaltic pump are as follows: the fluid will fall in the pipeline due to its own gravity, but the liquid is filled with the pipeline, and because the pipeline has only one end connected to the atmosphere, the Other end is crushed by the runner of the peristaltic pump and cannot be with the atmosphere. In the same way, the liquid will generate a tension in the pipeline, but since this tension cannot overcome the gravity of the liquid, the liquid will still drop. Now that we know that the tension in the pipeline is too small, is there any way to increase the tension and overcome the gravity? Of course, it is ok. We can easily increase the tension of the liquid in the pipeline by reducing the diameter of the outlet of the pipe, thereby solving the dripping phenomenon of the liquid. Of course, in addition to this simple method, we can also solve the dripping phenomenon by adding a one-way pressure valve at the outlet. When the pump is working, the pressure generated by the pump itself will open the check valve, and the pressure will disappear when the pump stops. The check valve is automatically closed.
Problems that need to be paid attention to in actual work: Because the peristaltic pump has a pulse phenomenon during operation, that is to say, when the peristaltic pump liquid is transported, the liquid flow in the pipeline suddenly decreases due to the pulse to form a back pumping and sucking phenomenon. The length of the small diameter of the pipe outlet we set must exceed the length of the peristaltic pump back. Because if the small diameter is too small, the liquid does not stay on the small-diameter pipe because the liquid is pumped back. The large tension of the liquid is still not formed, and naturally it does not function as a drip-proof.
Liquid self-tension anti-drip also has its limitations, because the liquid itself will evaporate over time, so if you need liquid anti-drip time is longer, then with evaporation, anti-drip will fail, so if you The system will often have a long downtime after a period of use, so the only closed check valve system is the only solution.
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