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| Classification of main sealing forms of chemical pumps
Chemical pumps are widely used in chemical, petroleum, metallurgy, light industry, synthetic fiber, environmental protection, food, medicine and other sectors. Compared with other types of pumps, chemical pumps have the advantages of stable and reliable performance, good sealing performance, beautiful appearance, convenient use and maintenance, etc. It plays a great role in improving product quality, reducing leakage, emission, dripping and leakage, preventing pollution and improving the environment. What are the main sealing forms of chemical pumps?
1. Oil seal:
It is a self tightening lip seal with simple structure, small size, low cost, convenient maintenance and small resistance torque. It can not only prevent medium leakage, but also prevent external dust and other harmful substances from invading. It also has a certain compensation ability for wear, but it is not resistant to high pressure. It is generally used in chemical pumps in low-pressure occasions.
2. Gasket seal:
The gasket is the basic element of the static seal of centrifugal pump, which is widely used. The selection of gaskets is mainly determined by the factors such as the medium conveyed by the chemical pump, temperature, pressure and corrosivity.
3. Thread seal:
Generally, there are two types of chemical pumps, one is screw connection gasket seal, and the other is thread plus filling seal, both of which are used for small diameter thread connection sealing occasions. The sealing element of the gasket seal of the threaded electric diaphragm pump is the gasket, and the thread only provides the 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 good. However, in practical applications, there are many chemical pump leaks, so they are not commonly used in chemical pump seals.
5. Packing seal:
It is to put the packing with compressibility and resilience into the stuffing box, and convert the axial compression force of the gland into the radial sealing force, so as to play a sealing role.
This sealing method is called packing seal, and this packing is called sealing packing. The packing seal is widely used in the design of chemical pumps because of its simple structure, convenient replacement, low price, and wide adaptability to speed, pressure and medium.
6. Power seal:
When the chemical pump is running with, the pressure head generated by the auxiliary impeller balances the high-pressure liquid at the outlet of the main impeller, thus realizing the sealing. The auxiliary impeller does not work during shutdown, so the shutdown sealing device must be equipped at the same time to solve the possible leakage of chemical pump during shutdown.
The auxiliary impeller seal is simple in structure, reliable in sealing and long in service life. The chemical pump can achieve no leakage during operation, so it is often used in the chemical pump to transport media containing impurities.
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Classification of main sealing forms of chemical pumps
