Magnetic Fluid Seal

1. Permanent magnets or electromagnets are installed at the sealing site to form a stable axial magnetic field at both ends of the rotating shaft.

2. The sealing gap is filled with a magnetic fluid, which is a stable liquid containing magnetic particles.  The magnetic fluid forms chain-like structures under the effect of the magnetic field.

3. Under the effect of the axial magnetic field, the magnetic fluid chains form a continuous magnetic fluid ring on the surface of the rotating shaft to achieve sealing.

4. As the shaft rotates, the magnetic fluid ring also keeps renewing, while maintaining an integral sealing state.

5. If pressure changes cause the gap to increase, the magnetic fluid ring can deform accordingly to continue ensuring zero leakage.

6. When the shaft stops rotating, the magnetic fluid restores its non-structured state and does not hinder the re-rotation of the shaft.

7. The magnetic fluid seal utilizes the special properties of magnetic fluids to achieve soft sealing of rotating shafts, solving problems existing in mechanical seals and achieving zero leakage and wear-free operation.

Magnetic fluid seals find extensive applications across a wide range of industries and equipment, thanks to their unique ability to provide leak-free sealing without wear or friction. Magnetic fluid seals ensure optimal performance of critical equipment. The versatility and effectiveness of magnetic fluid seals have made them a preferred choice in various sectors.

1.  Magnetic Fluid Seals in Petrochemical Industry:

- Reactors, distillation towers, centrifuges, and other refining and petrochemical production equipment.

- Pumps and compressors used in oil and gas pipelines.

2.  Magnetic Fluid Seals in Food and Pharmaceutical Industries:

- Homogenizers, mixers, and other food processing and filling equipment.

- Fermenters, extraction kettles, and other pharmaceutical production equipment.

3.  Magnetic Fluid Seals in Semiconductor and Electronics Industries:

- Etchers, magnetron sputtering equipment for wafer fabrication.

- Vacuum pumps, ion plating machines for electronic equipment.

4.  Magnetic Fluid Seals in Water Treatment Industry:

- Water pumps, valves for water supply and drainage systems.

- Reverse osmosis membrane systems for seawater desalination.

5.  Magnetic Fluid Seals in Other Industries:

- Drying cylinders in paper machinery.

- Pitch control gearboxes in wind turbines.

- Main engines as well as auxiliary engines in marine applications.

Magnetic fluid seals offer a reliable alternative to mechanical seals by providing leak-free sealing without wear or friction. The use of magnetic fluid seals in these diverse applications highlights their versatility and effectiveness. By leveraging the unique properties of magnetic fluid seals, industries can achieve higher efficiency, reduced maintenance, and enhanced reliability in their critical operations.

Yes, magnetic fluid seals can be custom designed to meet specific needs. Magnetic fluid seals use a magnetic fluid to form a sealing layer around a rotating shaft for extreme conditions that traditional mechanical seals cannot withstand, such as high vacuum, high pressure, or environments where contamination needs to be avoided.

When custom designing a magnetic fluid seal, a number of aspects can be adjusted, including the size of the shaft, the strength of the magnetic field, the type of magnetic fluid, the housing material and design, as well as being optimised for the specific conditions of the operating environment. For example, different carrier fluids can be selected to accommodate temperature and chemical compatibility, or specific magnets and housing materials can be selected to accommodate corrosive environments or temperature extremes.

This ability to customise makes magnetic fluid seals valuable in a wide variety of applications such as semiconductor manufacturing equipment, hard disk drives, vacuum systems, aerospace components and special industrial machinery. By accurately designing the magnetic circuit and selecting the right materials, magneto-fluid seals provide reliable sealing performance, even under extreme conditions.

Magnetic fluid seals produced by Zhaoqiang, are relatively low-maintenance compared to traditional mechanical seals, but they do require some specific care to ensure optimal performance and longevity. The maintenance of magnetic fluid seals typically involves the following aspects:

• Inspection: Regular inspections of magnetic fluid seals are crucial to detect any signs of wear or leakage early. Check for any reduction in the magnetic fluid level or contamination of the fluid, which can indicate a breach in the magnetic fluid seal.

  
  

• Fluid Top-Up and Replacement: Over time, the magnetic fluid in magnetic fluid seals may degrade or evaporate, especially under high temperatures or in aggressive environments. It is important to monitor the fluid level and quality of magnetic fluid seals, topping up or replacing the fluid as necessary to maintain the seal’s effectiveness.

  
  

• Cleaning: Accumulation of debris or external contaminants can affect the seal’s performance. Regular cleaning of the exposed parts of the magnetic fluid seal can prevent build-up that might interfere with the magnetic properties or the smooth operation of the seal.

  
  

• Magnetic Strength Check: The magnets in magnetic fluid seals should be checked periodically to ensure they maintain the necessary magnetic field strength. Weakening of the magnetic field can reduce the effectiveness of the magnetic fluid seal.

  
  

• Environmental Control: Since the performance of magnetic fluid seals can be sensitive to environmental conditions such as temperature and humidity, maintaining a stable environment can reduce the frequency of maintenance required.

By adhering to these maintenance steps, the reliability and functional life of magnetic fluid seals can be significantly enhanced, reducing downtime and maintenance costs in critical applications. Regular maintenance of magnetic fluid seals not only ensures optimal performance but also prevents potential failures that could lead to more significant equipment damage or operational disruptions.