While magnetic fluid seals have many advantages, they also have some disadvantages. When considering whether or not to introduce them, it is important to understand not only their advantages, but also their disadvantages, and to make a thorough judgment.
The first disadvantage of magnetic fluid seals is the high initial cost. Compared to other sealing materials such as O-rings, oil seals, and mechanical seals, magnetic fluid seals tend to be more expensive to introduce.
This is because magnetic fluid seals require the use of special components such as magnetic fluids and magnets, which are more expensive to manufacture. In addition, at the initial stage of introduction, specialized design and adjustment to the equipment is required, which is also part of the initial cost.
However, this is not entirely a disadvantage from a long-term perspective. Magnetic fluid seals have a longer service life than other sealing materials. As a result they are replaced less frequently and have lower maintenance costs. Ultimately, in terms of total cost, magnetic fluid seals are in many cases rather more economical than other sealing materials.
Magnetic fluid seals, while offering many advantages, can fail during use. Through proper selection, design and maintenance, these problems can be effectively prevented and the performance of magnetic fluid seals can be fully utilized.
The following are the key points:
To make the magnetic fluid seal function properly, the selection of the magnetic fluid itself is very critical. Magnetic fluids have a variety of performance parameters, including viscosity, saturation magnetization, saturation vapor pressure, temperature adaptability, etc., which need to be matched to the equipment applied and the use of the environment.
Saturation magnetization strength is a measure of the ability of a magnetic fluid to hold up in a magnetic field. The higher the saturation magnetization, the greater the differential pressure the seal can withstand.
Saturated vapor pressure has a direct impact on seal performance. The lower the vapor pressure, the more stable the seal, but the corresponding cost will also increase, so should be based on the specific use of the selection of the appropriate magnetic fluid.
Temperature characteristics should also not be ignored. The viscosity of the magnetic fluid will fluctuate with temperature changes, and must be selected to adapt to the use of environmental temperature range of the type.
By taking these performance parameters into consideration and selecting the most suitable magnetic fluid, the performance of the magnetic fluid seal can be maximized. MORETEC can provide up to 15 different types of magnetic fluids to customize the optimal sealing solution according to the application.
In magnetic fluid seals, the design of the magnetic field directly determines the sealing performance. By properly designing the magnetic field, the magnetic fluid can be stably maintained, thus realizing efficient sealing. The following two aspects are particularly critical:
Magnetic flux density
The key factor affecting the holding power of magnetic fluid. The desired sealing performance can only be guaranteed if the magnetic flux density is set at a reasonable level. Too low a density will result in insufficient sealing performance, while too high a density may lead to saturation and failure of the magnetic fluid.
Sealing gap (Seal Gap)
A gap that is too large weakens the magnetic field strength and affects the stability of the magnetic fluid, thus reducing sealing performance.
Moyatec Corporation utilizes magnetic field analysis technology to accurately simulate magnetic flux density distribution, sealing gaps, etc. to design the most suitable magnet layout and structure to ensure sealing effectiveness.
Magnetic fluid seals rely on a highly clean operating environment to maintain excellent performance. If contamination occurs (e.g., foreign matter mixing in), it will lead to a decline in sealing performance and a shorter service life. Therefore, effective measures are needed to prevent contamination.
In addition, periodic replacement of the magnetic fluid is an effective means of maintaining seal performance. Magnetic fluid deteriorates over a long period of time, so replacing it periodically will help maintain optimum performance.
Moyatec not only provides customers with a magnetic fluid sealing solution for their equipment, but also gives professional advice on contamination prevention measures to ensure stable operation of their equipment.
Through the above selection, magnetic field design and maintenance measures, common failures of magnetic fluid seals can be effectively avoided, ensuring their efficient and long-lasting operation in equipment.
Magnetic fluid seals have a longer service life compared to other sealing methods, but their performance can be further extended by performing proper maintenance. The frequency of maintenance will vary depending on the environment and conditions of use, but regular inspection and proper handling are critical.
Magnetic fluids may undergo viscosity changes, or magnetic particles in them may aggregate, due to prolonged use or the influence of the environment in which they are used. These conditions can cause deterioration of the sealing performance, so it is necessary to replace the magnetic fluid periodically.
Wear and tear of the rotor shaft or sealing surface may cause leakage. It is necessary to inspect the relevant parts regularly and replace them as necessary to maintain the sealing effect.
If foreign matter is mixed inside the magnetic fluid seal, the sealing performance may deteriorate. Regular cleaning should be performed to prevent foreign matter from accumulating and contaminating.
The performance of magnetic fluids fluctuates depending on the temperature, so it is necessary to control the temperature appropriately according to the operating environment to prevent deterioration of performance.
MORETEC also provides maintenance and refurbishment (overhaul) services for magnetic fluid seals. If you encounter problems during use, please feel free to contact us and we will provide you with professional support.
Magnetic fluid seals are widely used in a variety of industrial fields due to their excellent sealing properties. However, when considering their introduction, various questions may arise regarding the type of magnetic fluid, magnetic field design, maintenance methods, and so on. Based on our many years of experience and proven track record, MORETEC CO., LTD. provides customers with optimal solutions to help resolve various problems and concerns.
The cost is high at the time of introduction, but due to its long life, the maintenance cycle can be extended, thus reducing the overall cost.
We offer 15 types of magnetic fluids, and select the most suitable one according to the customer's usage conditions and needs.
We utilize magnetic field analysis technology for uniform magnetic field formation design to ensure the most suitable magnetic flux density.
We offer disassembly and maintenance services for our products. Please note that warranty may be voided if the customer disassembles the product by himself/herself.
We also respond positively to the demand for short-term delivery. Programs may vary for different products, so please feel free to consult with us.
We offer not only standard products, but also customized services to meet customer needs. We will design based on our experience to meet customer's requirements
MORETEC CO., LTD. has established an integrated system from design to manufacturing and sales in order to provide customers with the most suitable magnetic sealing solutions. If you have questions or needs regarding magnetic fluid seals, please feel free to contact us.
