The reasons for damage to the multistage pump stator are as follows:
1. Multi-stage pump stator rubber shelling. The main reason for the improper selection of the binder, the improper treatment of the inner surface of the bonded pump casing or the unclean inner surface are caused.
2. The multi-stage pump stator rubber is dropped. The main reason is the excessive hardness of the rubber selected, the “over-sulfur” when the rubber is vulcanized, the “early vulcanization” of the rubber, or the excessive interference of the stator and the rotor.
3. Multi-stage pump stator rubber is not wear-resistant. When conveying the medium containing impurities, the tensile strength of the rubber stator is much lower than the compressive strength. Once the hard particles are embedded, the hard particles embedded in the rubber will undergo tensile deformation under the tensile force of the rotor. In order to cause the molecular chain to break, that is, beyond the strength of the molecular chain, the stator cracks, expands and breaks. In addition, the stator is subjected to hard particle cutting during pump operation, and the resulting wear is also an important cause of stator damage. Therefore, it is especially important to choose the right compound. If the selection is not appropriate, the stator is more likely to wear.
In addition to the unreasonable formula of rubber compound, the rubber content is too low, and the hardness of rubber is not properly selected, the interference unevenness or interference of the stator and rotor is too large, the medium is bad or the rubber is aging, etc. the reason.
4. Multi-stage pump stator tooth profile curve shape deformation. The main reason is that the rubber has poor compression set resistance, the production process control of the pressed rubber has problems, the vulcanization is insufficient, the shape of the stator core for pressing is inaccurate, the stator core is placed eccentrically during pressing, the surface quality of the stator core or the stator cavity rubber Factors such as poor surface quality.
To ensure the quality of the rubber stator, the first condition is to correctly select the rubber type according to the working conditions and media conditions. When storing the stator, avoid sunlight, sub-20 °c or high temperature environment, and contact with dust and oil and other corrosive and corrosive media. Also pay attention to the storage should not expire, avoid aging (usually according to the plastic storage period of six months to One year).
5. The volume of the multi-stage pump stator core Rubber stator in the injection of rubber, you must know the amount of rubber required to press a stator. It is very difficult to accurately calculate its volume, and it is not necessary. Therefore, an approximate method can be used for calculation. When pouring, it is necessary to consider auxiliary materials such as gates and risers, and then add more The amount can be.
6. Multi-stage pump rubber sleeve The stator is not suitable for the medium to be transported. The rubber sleeve should be selected according to the medium to be transported.
