Main components of 2 gas brake piping system and their influence on sealing performance
2.1 Air compressor and air dryer
The air dryer can collect fine oil mist into larger particles and then separate it from the gas path through the filter element, thereby effectively improving the service life of valves and the like in the gas pipeline. There are also some companies in the country that are installed to handle the oil in compressed air. Of course, the best solution is to use high-quality, large-displacement air compressors to improve the air compressor piston sealing performance and reduce the self-load rate, thus completely solving the air compressor oil problem.
2.2 brake valve
Brake valve parts are used as the control part of the brake pipe system. Although the number is small, the pressure of the compressed air is subject to the pressure of the compressed air for a long time, which plays a key role in the sealing performance of the pipeline system.
There are two main types of typical sealing of valve parts: (1) end face sealing. The seal of the valve port is made by contacting the rubber seal with the end face of the valve port. This type of seal is widely used due to its good manufacturing process. However, the contact area of ​​the valve port is large, and the sealing effect is deteriorated when there is a defect in the contact surface or foreign matter with impurities.
(2) The structure of the two valve chambers is sealed by being embedded on the piston rod, and the structure is relatively simple. When the tolerance of the machining size or shape of the inner wall of the shaft hole is large, or the foreign matter on the contact surface is contaminated, the sealing effect is also deteriorated.
2.3 Pipes and pipe joints In addition to valve components and air reservoirs, the brake pipe system is a large number of pipes and pipe joints. Their performance is directly related to the sealing performance of the entire system.
3 Measures to improve the sealing performance of vehicle brake system 3.1 Adopt international advanced technology to improve the quality of brake components of domestic vehicles. Domestic enterprises should actively learn from international advanced commercial vehicle manufacturers, design brake system design according to international standards, and select excellent air performance. The press uses a high-quality air dryer (APU) to eliminate condensate and impurities entering the brake system as much as possible to purify the compressed air; strictly control the quality of the brake valve and other brake valves to maintain the brake The system has better sealing performance; use less pipe joints for the brake pipe because there is one more leak point in the system; choose nylon pipe with good sealing and corrosion resistance instead of metal pipe, foreign The practical application shows that even in the cold regions such as northern Europe, nylon pipes can still meet the requirements of vehicle operation; in addition, the use of internationally advanced quick-release pipe joints is an effective way to improve the sealing performance of the brake system.
3.2 Strengthen the training of enterprise employees to ensure the assembly quality of the brake system During the assembly process of the whole vehicle, strict measures should be taken in the logistics and pipeline assembly to keep all valves and pipe joints clean and prevent oil, dust, metal chips, etc. The damage of pollutants, the comprehensive implementation of the quality management system, the strengthening of employee position training, strict implementation of the brake system assembly process technical documents, completely eliminate the illegal operation in the assembly process.
3.3 Specification of vehicle modification operation to improve the sealing performance of the auxiliary gas system Since the vehicle brake and the auxiliary gas system are difficult to be completely isolated, any leak at one place will result in a decrease in the sealing performance of the entire system. In the process of vehicle interior modification, the chassis brake system is sometimes required to supply compressed air to the outside. It has two effects on the vehicle chassis: 1 the air consumption of the whole vehicle increases, and the air compressor load rate increases. 2 The operation of the brake pipe during the modification process may cause leakage. Therefore, dump trucks, cement mixers and other top-loading conversion enterprises must regulate vehicle intake, air consumption must not exceed the chassis manufacturer's regulations, and strictly control the auxiliary gas system components and pipeline assembly quality, so that it does not affect the vehicle brake The sealing performance of the system.
3.4 For the user to carry out vehicle maintenance promotion, strengthen the after-sales service vehicle use, the user must follow the vehicle instruction manual to carry out the maintenance and maintenance of the brake system, which is essential to maintain the good sealing performance of the brake system. It is recommended that the whole vehicle after-sales service system strengthen the propaganda for vehicle users, especially for engineering vehicles, remind users to regularly check the air compressor intake system, replace the engine intake filter element in time; regularly check the air reservoir and find that there is water The drying tank of the air dryer must be replaced; during the use of the vehicle, the fixing of the tube bundle on the frame should be checked from time to time. If the nylon tube is found to interfere with metal parts or other parts, timely correction should be made to avoid air leakage caused by wear. . In addition, vehicle maintenance needs to be done in the vicinity of the nylon tube. The air pressure inside the tube should be drained and the pipeline should be covered to prevent the spark from splashing and damaging the tube, causing air leakage (small perforation on the tube during welding). Hard to find).
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