Views: 279 Author: Site Editor Publish Time: 2021-06-29 Origin: Site
Metric bsp hydraulic hose fittings and hydraulic brake hose fittings are important parts in hydraulic transmission systems. The hydraulic oil is used as a working medium in the hydraulic transmission system, which plays the role of energy transmission, conversion, and control, and also helps the lubrication, anti-corrosion, anti-rust, and cooling of the components in the hydraulic system. The seals in the hydraulic system play a role in preventing fluid leakage from the joint surfaces, maintaining pressure, and maintaining energy transfer or conversion.
At present, most of the sealing materials used at home and abroad are polymer elastomers, and plastics and various metals are also used under some special conditions. But no matter what kind of material it belongs to, it should have the following properties:
First of all, it needs to have certain mechanical and physical properties: such as tensile strength, tensile strength, and elongation. Second, it should have a certain degree of elasticity, appropriate hardness, and a small compression set. Third, the sealing material is compatible with the working medium and is not easy to swell, decompose, and harden. Fourth, it is abrasion resistant and has certain tear resistance. Fifth, it has a high temperature and low temperature aging performance.
In addition to sealing materials, the performance of accessories is also very important. Therefore, we recommend brass swivel fittings and brass fitting for PVC pipes.
The sealing theory believes that there is a complete lubricating film between a dynamic flexible seal and its mating surface. Under normal conditions, it is this layer of lubricating film to achieve the purpose of sealing and extend the life of the seal.
In the hydrostatic drive system, in addition to the compatibility of the medium and the sealing material, all the factors that affect the formation and characteristics of the lubricating film affect the sealing effect. Generally speaking, forming a continuous lubricating film can achieve an ideal sealing effect.
The NOK company in Japan first explained the sealing principle of oil seals with the latest image processing technology in the world. It is believed that the sealing machine of the oil seal (rotating dynamic seal) consists of two parts: lubrication characteristics and sealing principle. For the lubrication characteristics, the friction characteristics of the oil seal are governed by the viscosity and sliding speed of the fluid. The relative sliding surfaces of the oil seal and the shaft move in the lubricated state with the oil film separated, so the friction resistance and wear are kept small. The sealing principle refers to the circulation of the oil on the sliding contact surface of the oil seal from the atmosphere side to the oil side and then from the oil side to the atmosphere side. The sliding surface is well lubricated to prevent the progress of wear, so there is no leakage.
When the hydraulic power transmission system movement speed is too high, it affects the formation of a continuous lubricating film, resulting in increased frictional heat, and exceeding the temperature resistance range of the sealing material will cause damage to the seal. When the pressure is too high, in addition to affecting the formation of the oil film, it will also have a "squeezing" effect on the rubber and plastic seals. Generally, "retaining rings" can be used to improve. Or choose the structure of PTFE composite seal with the low friction coefficient and good self-lubricity will help to improve the lubrication between friction pairs, which is suitable for high and low-speed reciprocating motion, and oil cylinder piston and piston rod seal of the high-pressure system. Therefore, diaphragm pressure gauges and oil pressure testers are necessary, which is used to measure pressure.
Reasonable selection of seals and sealing materials, correct installation, use, and maintenance of seals according to the system operating conditions and medium environment are the keys to obtaining effective sealing effects, reliability, and service life. At the same time, you also need to purchase hydraulic hose clamps and orbit hose clamps to control the transfer connection.
