Today I combine practice to discuss this problem with you, what kind of pump is a good pump?
1: What kind of pump is a good pump.
The so-called good pump I think contains the meaning of two aspects: one is good quality, that is, in line with the requirements of the drawings. Including material, size, heat treatment requirements, etc. Second, the shape is correct, that is, in line with the requirements of working conditions. Including flow rate, pressure, temperature, corrosion, material requirements, etc.
Only when the two are combined, can we choose a good pump, and it is not that the higher the accuracy of the pump is, the smaller the gap of the pump is, the better. For example, in the case of conveying high temperature heat conduction oil, you can't make the sealing gap of the pump too small, and it is easy to stop rotating if it is too small.
For example, in the conveying of high viscosity liquid occasions, also can not make the gap too small, do too small is easy to heat, also easy to stop rotating. Mechanical efficiency will be reduced, it will affect the overall performance of the pump. When conveying high viscosity liquid, choose a suitable speed is particularly key, the speed is fast, it is easy to produce suction phenomenon. Pump noise and flow can not meet the requirements, the speed is slow, you need to choose a large pump to meet the requirements, it is not economic.
When conveying corrosive media, it is a good idea to choose stainless steel gear pump.
Therefore, any kind of pump is not a universal pump, its scope of application will be subject to certain restrictions. This requires a professional engineer to have a detailed understanding of the working conditions on the basis of understanding the pump, and will choose a pump with appropriate performance parameters to meet the working conditions of the pump.
To transfer the liquid containing gas, choose diaphragm pump is good.
So you can't say this pump is good and that pump is bad. Only suitable, is the best.
2: Notes:
Gear pump selection to follow the first principle is applicability, not the higher the accuracy of the gear pump, the smaller the gap, the better, the pump to choose as long as applicable to working conditions is the best.
For example, the transport of high temperature liquid, the gap is small may hold dead; Transport of high viscosity liquid, the gap is small, may heat, mechanical effect will be reduced; Transport no corrosive liquid, sealing material is not suitable for ptfe; Conveying normal temperature liquid, absolutely do not need metal bellows seal; Conveying no corrosive, lubricating liquid, stainless steel material is not used.
So what kind of pump is a good pump? No matter how good the product is, if it is not suitable for working conditions, it is also a wrong choice!