Correctly understand the oil leakage phenomenon of shock absorber
In order to meet the application requirements of the function of the shock absorber itself, there is a thin oil film on the surface of the piston rod in the design of the shock absorber itself. These oil films will be scraped off by the dust lip on the oil seal of the shock absorber when the shock absorber is tightened. At the same time, a very small amount of oil will accumulate on the upper part of the oil seal. Due to the high permeability of this oil, the oil accumulated on the upper part of the oil seal will start to diffuse from the upper part of the shock absorber to the lower part, forming a thin oil film, which makes people mistake this situation as oil leakage, In practice, this situation does not affect the application.
Oil film: the key factor affecting the durability and smoothness of oil seal, the composition and scraping of oil film
When the piston rod extends, it forms an oil film. When the piston rod is pressed in, the oil film will remain outside the oil seal when it is scraped by the oil seal dust lip. In order to enable the dealer service providers to correctly understand the principle that the shock absorber will naturally form an oil film during normal operation, they can give the user a correct explanation. The oil leakage mechanism of shock absorber is discussed as follows:
Shock absorber oil leakage: because there are microcracks on the surface of the piston rod coating, the microcracks on the piston rod store a certain amount of damping oil to form an oil film, making the friction between the piston rod and the oil seal wet friction, thus improving the shock absorption performance of the pneumatic butterfly valve, and greatly extending the service life of the pneumatic butterfly valve. A small amount of oil leakage is a normal phenomenon. The composition of the oil film is a special design to ensure the function of the shock absorber and extend its service life.
The oil stain of ordinary oil leakage does not exceed the spring disc. The oil stain is limited to the lower spring disc from the oil seal of the pneumatic butterfly valve. It is normal oil leakage and cannot be considered as oil leakage. The design of oil filling volume in the ordinary shock absorber once considered the loss of oil leakage. When the shock absorber was consumed, the oil volume was filled according to the specification. When the normal loss of oil in the use process does not exceed 25ml, the shock absorber will not appear abnormal. The results of the bench durability test on the oil leaking shock absorber show that oil leakage will not constitute oil leakage even after driving 200000 km, After the experiment, the amount of synthetic oil is reduced by 5-20ml. The performance of the shock absorber meets the application requirements. Acoustic wave characteristics and noise reduction methods
A acoustic system is composed of three rings of sound source, transmission path and receiver. Therefore, noise control must be considered from these three aspects, not only to study it separately, but also to consider it comprehensively as a system.
B Suppress noise at the sound source, which is the most basic measure, that is, active disposal. It includes reducing the excitation force, reducing the response of each link of the system to the excitation force, and modifying the operation procedure or technological process.
C In the control of sound transmission, acoustic control is adopted, that is, passive disposal. This is a common technology in noise control, including sound insulation, sound absorption, noise elimination, damping and vibration reduction measures.

Nonmetallic compensator is also called fabric compensator and the function of each part
The non-metallic contraction joint, also known as non-metallic compensator and fabric compensator, is a kind of compensator. The data are mainly fiber fabrics, rubber, and other high-temperature resistant data. It can compensate the vibration of fan and air duct operation and pipeline deformation.
Application characteristics of non-metallic contraction joint:
1. For low temperature - 70 ℃ to high temperature 260 ℃;
2. It is resistant to ozone, oxygen, light and climate aging, and has excellent weather resistance for outdoor use, with a service life of up to 10 years;
3. High insulation performance, dielectric constant 3-3.2, breakdown voltage 20-50KV/MM;
4. Good flexibility, large external friction, good elasticity;
5. Multi direction compensation: non-metallic compensator can provide large axial, angular and lateral displacement in a small size range; 6. No reverse thrust: the main materials are glass fiber fabrics and their coated products, which can not be transmitted. The use of non-metallic compensators for non-metallic contraction joints can simplify the design, prevent the use of large supports, and save a lot of data and labor; 7. Noise elimination and shock absorption: It is made of silicone rubber and glass fiber cloth, which has the characteristics of high thermal insulation, shock isolation and noise reduction, resistance to (high) and low temperatures, corrosion resistance, pressure resistance, simple structure, light weight, easy device maintenance, etc. Fiber fabrics and thermal insulation cotton have the function of sound absorption and shock absorption, which can effectively reduce the noise and vibration of boiler, fan and other systems; 8. Excellent high temperature resistance, corrosion resistance and sealing performance: organic silicon, fluorine and other macromolecular materials are used for coating treatment, with excellent high temperature resistance, corrosion resistance and sealing performance; 9. The device is easy to maintain.