What isDust seal? The function performance of the sealing ring is divided?
Oil seal products can be used as dust seals, but in the dust serious working environment or in order to protect other seals, often still need to use special dust seal products.
Dustproof seals of hydraulic machinery equipment are mostly made of rubber materials, pneumatic machinery equipment is mostly made of felt materials (square or trapezoidal), aircraft and hydraulic cylinders working in cold zones use metal materials to seal products to deal with icing on the outside of piston rods, and chemical departments also use metal materials to prevent adhesion on piston rods.
Square or trapezoidal dust seal ring is a packing seal in the sealing mechanism. The dust-proof ability is related to the tightness of the contact surface. The tighter the contact, the better the dust-proof ability, but the greater the friction resistance. Wedge dust seal ring is actually no different from the lip type seal ring, relying on the contact force of the lip tip to scrape dust and dirt.
The friction resistance is small, and the angle formed by the lip tip and the shaft surface has a great influence on the sealing and wear of the dust-proof efficiency. When the lip tip is outward, the included angle is greater than 4 °, and the dust-proof effect is not good when the lip tip is inward.
The contact state of the seal lip with the shaft surface also directly affects the dustproof effect and the wear of the seal lip. There are several common contact conditions, in which the normal contact state, the oil film is thin, the dust-proof effect is good, and the wear is less;
The interference of the sealing lip contact is too large, the contact is too tight, and the contact surface is wide, which changes the contact angle and makes the lip tip tilt, which not only makes the dust-proof effect, but also has high friction resistance, insufficient contact with the lip tip, and little friction. But it can't be dustproof;
The contact angle of the lip tip is too large, the dustproof effect is short, and it is easy to wear, causing serious oil leakage. Dust seals are important to protect critical hydraulic equipment components.
Infiltration of dust, not only wear seals, and will cause the wear of the guide sleeve and piston rod, impurities into the hydraulic sealing medium, will also affect the operation of the valve and pump function, in bad cases, may also damage the device equipment. The dust seal can remove any dust on the surface of the piston rod, but does not damage the oil film on the piston rod, which is also beneficial to the lubrication of the seal product.
What is a dust seal ring? Dust ring is a kind of sealing ring to prevent foreign objects such as dust or particles from the outside.
Dust Ring (Dust Ring) is a kind of sealing ring to prevent foreign objects such as dust or particles from the outside world. The main function is to remove the dust, sand, rain and frost attached to the external surface of the reciprocating piston rod, and prevent external dust and rain from entering the sealing mechanism.
A good dust seal should be a sharp lip structure with a low coefficient of friction. This can prevent external dust from entering the system and reduce the wear of the equipment.
Thin combined dust-proof sealing ring DSZL thin combined dust-proof sealing ring DSZL dust-proof sealing ring is mainly used for oil cylinders or transmission shafts, such as Dongsheng PTFE dust-proof sealing ring, which adopts PTFE skeleton and O-ring structure dust-proof sealing ring, can be used for dust-proof of oil cylinders in harsh environments and has self-lubrication. At the same time can protect the cylinder piston is not damaged by dust.
