Chemical pumps are widely used in chemical, petroleum, metallurgy, light industry, synthetic fiber, environmental protection, food, medicine and other sectors. Compared with other kinds of pumps, the chemical pump has the advantages of stable and reliable performance, good sealing performance, beautiful shape and convenient maintenance. In order to improve product quality, reduce run, run, drop, leak, prevent pollution, improve the environment, play a great role. So the chemical pump seal form of the main points of which several?
1. Oil seal:
Is a self-tightening lip seal, its structure is simple, small size, low cost, convenient maintenance, resistance torque is small, can not only prevent the media leakage, can prevent external dust and other harmful substances intrusion, and have a certain degree of compensation for wear, but not resistant to high pressure, so generally used in low pressure occasions on the chemical pump.
2. Gasket seal:
Gasket is the basic element of centrifugal pump static seal, the use range is very wide. The selection of gasket is mainly based on the chemical pump transmission medium, temperature, pressure and corrosive factors.
3. Thread seal:
There are two general forms on chemical pump, one is the thread connection gasket seal, one is the thread and fill seal, both are used for small diameter thread connection sealing occasions. The gasket seal of the threaded electric diaphragm pump connection gasket is the gasket, and the thread only serves to provide compression force.
4. Labyrinth seal:
When the design is reasonable, the processing is excellent, the assembly is complete and the speed is high, the labyrinth seal effect is very good. But in practical application, the resulting chemical pump leakage is a lot, so in the chemical pump seal is not commonly used.
5. Packing seal:
It is to put the packing with rich compressibility and resilience into the packing box and convert the axial pressing force of the gland into radial sealing force so as to play a sealing role. This method of sealing is called packing seal and this packing is called packing. Due to the packing seal structure form is simple, easy to replace, low price, adapt to the speed, pressure, medium is broad and widely used in the design of chemical pump.
6. Power seal:
When the chemical pump is in operation, the pressure head generated by the auxiliary impeller balances the high-pressure liquid at the outlet of the main impeller, so as to realize the sealing. When parking, the auxiliary impeller does not work, so it must be equipped with a parking seal device to solve the possible leakage of chemical pump during parking. Auxiliary impeller seal structure is simple, reliable seal, long service life, chemical pump operation can be achieved watertight, therefore in the chemical pump transport medium containing impurities on the pump often used.
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