Gear oil pump requirements for mechanical seals
Clinching Nut,Hex Rivet Nut,Self Clinching Rivet Nut,Rivet Nuts Screwfix,Rivet Nut Dongguan Tiloo Industrial Co., Ltd , https://www.sales-fastener.comRequirements for Mechanical Seals in Gear Oil Pumps
Mechanical seals, also known as mechanical face seals, are dynamic seals used to prevent leakage from rotating shafts. These seals are highly reliable, with minimal leakage, long service life, and low power consumption. They require less frequent maintenance and can adapt to automated production processes, as well as extreme conditions such as high or low temperatures, high pressure, vacuum, high-speed rotation, and corrosive media. Additionally, they are suitable for environments with solid particles.
A mechanical seal works by using a pair of sealing faces that remain in contact under the influence of fluid pressure and the elastic force (or magnetic force) of the compensating mechanism. These faces are aligned perpendicular to the shaft and move relative to each other during operation.
### Advantages of Mechanical Seals:
1. **Strong Seal**: The sealing performance is stable over long periods, with minimal leakage—typically about 1% of that seen in soft packing seals.
2. **Long Service Life**: In oil and water media, they can last up to 1–2 years or more. In chemical media, they often work for over six months.
3. **Low Power Consumption**: The power required for the wiper is only 10%–50% of that needed for soft packing seals.
4. **Minimal Wear**: The shaft or bushing experiences little wear.
5. **Long Repair Interval**: The end face can compensate for wear automatically, reducing the need for frequent repairs.
6. **Good Shock Resistance**: They are insensitive to shaft oscillation and misalignment within the sealed cavity.
7. **Versatile Application**: Suitable for high temperature, low temperature, high pressure, vacuum, variable speed, corrosive media, and abrasive environments.
### Disadvantages of Mechanical Seals:
1. **Complex Structure**: Requires precise manufacturing and assembly.
2. **Installation and Replacement**: More challenging than soft packing seals; requires skilled personnel.
3. **Difficult to Handle in Emergencies**: If an accident occurs, it may be difficult to manage quickly.
4. **High Initial Cost**: Higher upfront investment compared to other sealing methods.
### Key Considerations When Selecting and Installing Mechanical Seals:
1. **Seal Type**: Ensure the standard meets the design requirements. Check for damage, deformation, or cracks in critical parts like the sealing surface and auxiliary rings.
2. **Component Fit**: Verify that the roughness and parallelism of the seal components match the design specifications.
3. **Spring Adjustment**: For small spring seals, check that the spring length and stiffness are consistent.
4. **Shaft Condition**: Evaluate the axial movement (not exceeding ±0.5 mm), radial runout (not exceeding 0.06 mm), and shaft deflection (not exceeding 0.05 mm).
5. **Alignment**: Ensure the sealing end cover and gasket are flat and properly aligned, with a straightness difference of 0.03–0.05 mm.
6. **Cleanliness**: Keep the rotating ring, stationary ring, and auxiliary sealing ring free from impurities, dust, and contamination.
7. **Avoid Damage**: Do not tap or apply excessive force to the sealing elements to prevent damage.
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