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Basic concept of secondary impeller shaft seal
The secondary impeller shaft seal is a non-contact sealing method that relies on fluid dynamic action for sealing. In the slurry pump, the secondary impeller shaft seal mainly forms an air or water slurry balance with the slurry on the outer edge side of the secondary impeller through the pressure generated by the rotation of the secondary impeller, effectively resisting the leakage of liquid at the outlet of the main impeller.
Structural type of secondary impeller shaft seal
There are two main structural types of secondary impeller shaft seals:
Metal pressure relief cover secondary impeller seal: This type is relatively more common and suitable for various industrial environments.
Rubber pressure relief cover secondary impeller seal: Especially suitable for occasions that require good elasticity and wear resistance.
Advantages and application scenarios of secondary impeller shaft seal
advantage
No need for shaft seal water: When using the secondary impeller shaft seal, no additional shaft seal water is required, which simplifies the system and reduces maintenance workload.
Not diluting the slurry: The design of the secondary impeller shaft seal avoids the dilution of the slurry, maintaining the purity and quality of the ore.
Good sealing effect: Due to its unique design, the secondary impeller shaft seal performs well in sealing low-pressure liquids containing impurities.
Application scenarios
The secondary impeller shaft seal is particularly suitable for the following situations:
Single stage pumps or multi-stage series connected first stage pumps with a positive pressure value at the pump inlet not exceeding 10% of the pump outlet pressure value: Under these conditions, the secondary impeller shaft seal can provide effective sealing effect.
Process sections that do not allow dilution of slurry: For example, in certain process sections of the coal washing system that do not allow dilution of slurry, the secondary impeller shaft seal is an ideal choice.
Comparison with other forms of shaft seals
Packing seal
Advantages: Simple structure, affordable price, and easy maintenance.
Disadvantages: Large leakage and power loss, usually used for conveying general media.
Mechanical seal
Advantages: High reliability, long lifespan, strong adaptability, suitable for sealing media with different viscosities, strong corrosiveness, and containing abrasive solid particles.
Disadvantages: High cost and relatively difficult maintenance.
Basis for selecting the secondary impeller shaft seal
When choosing a secondary impeller shaft seal, the following factors need to be considered:
On site water volume and pressure: If the on-site water volume and pressure can meet the requirements of the slurry pump shaft seal water, the secondary impeller power seal is an economical choice.
The availability and stability of water sources: In cases of water shortage or unstable water pressure, it may be necessary to consider the grease lubricated impeller dynamic seal.
Requirements for sealing effectiveness: If there are particularly high requirements for sealing effectiveness, mechanical seals may be a better choice.
In summary, the secondary impeller shaft seal, as a unique sealing method, plays an important role in the sealing of slurry pumps. By selecting and applying the secondary impeller shaft seal reasonably, the service life of the pump can be effectively improved and economic losses can be reduced.
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(Editor in charge: Slurry Pump https://www.fuyangpumps.com/)
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