it is used in Semiconductor & Petrochemical and Chemical field, it can resist in High Temperature.
What is Welded Metal Bellows?
A cylindrical, wrinkled shape mechanical element manufactured with thin sheets of which thickness is 0.05~2.0mm, processed to be wavelike, and Joined by successive weld.
The Welded Metal Bellows is a precision part used in reciprocation motion or severe bending where air tightness is critical.
The Welded Metal Bellows are being widely used in vacuum equipments. synchrotron light source, gauge instruments, and general industries.
Effective use of the Welded Metal Bellows
Due to their air tightness, durability, corrosion and heat resistance, bellows are being widely used in many industrial fields inculuding semiconductor process lines. Their reliability has been well proven during the past 50 years of use in defense industries, which accelerates their applicability.
Since these bellows are manufactured by welding very thin (approx. 0.1mm), multi-layered metal sheets, special care should be taken when using them.
Convolution (CV)
A convolutionl5 formed when a positive and a negative diaphragm is welded together (Internal diameter welding)
Capsule
A Capsule is formed when two or more convolution is welded together(External diameter welding)
Introduction of Magnetic
Fluid and Sealing Principle
The magnetic fluid is a type of colloid fluid mixed from the magnetic nanometer particles distributed into the fluid after special treatment.
It has the property of liquid and magnet.
The sealing technology is realized from the response characteristic of the magnetic fluid.
When the magnetic fluid is poured into the clearance of the magnetic return path resulting from the high quality permanent magnet, excellent pole shoe and polaxis,
several O-type of fluid circles will be formed among the clearance of the magnetic fluid under the influence of the magnetic field.
The magnetic fluid will have minor movement in the magnetic field and produce the magnetic force resist against the differential pressures. When a new balance achieves, it has the sealing
Magnetic Fluid Seal Application
Semiconductor equipment, solar energy equipment, TFT-LCD equipment, vacuum coating machine, single crystal furnace, polycrystalline furnace, etc.
Magnetic Fluid Seal Device Instruction Manual
1. Dust and solvents (water, oil, alcohol, acetone, freon, etc.) can not invade into magnetic fluid seal device;
2. Using the helium mass spectrometer leak detector to check leakage;
3. May not add the overshoot pressure, add the pressure 1 under vacuum occasions. The pressure only achieves to the technical specified required pressure;
4. When the rotation shaft of magnetic fluid seal device is still, it will lead to vacuum pressure rise if vacuum-pumping on the vacuum chamber or revolve after a long stop under the vacuum condition, this is the inherent phenomena for magnetic fluid seal device, and eliminate it by such measures of early launching;
5 When using the water-cooled product, the temperature of water should be in 20ºC and the pressure in 1~3, cooling water can use ordinary tap water (chloride ion 200mg/L, iron ion 0.3mg/L). In addition, the device can not bear the water, as this would result in shaft bearing rust and affect the back swing.
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