Due to the high gas pressure and the dozens of connection points of the compressed air system, maintaining excellent sealing performance is an important problem for compressed air systems, and this problem is more prominent as the operating life increases. The most direct impact of the seepage/leakage phenomenon of the pneumatic mechanism on the operation of the circuit breaker is frequent pressure and a series of consequences. First of all, it is easy to cause the pressure to be too long. The frequent starting of the air compressor shortens the time interval between each start, and the internal components of the air compressor are not fully lubricated, thereby accelerating the wear of the piston ring and even the damage of the air compressor. Second, the wear of the piston ring reduces the efficiency of the air compressor, and the amount of air taken in at the rated pressure increases. For a long time, the investigation of the seepage/leakage phenomenon mainly adopts the “soap water smearing methodâ€, that is, the soapy water is applied to the compressed air pipe joint or the suspected osmotic/leakage area, and if there is a bubble in the smear part, it is considered that there is oozing/ Air leaks. The “soap water smearing method†is simple and easy to use, and is widely used on the spot. However, there are some obvious shortcomings in the "soap water smearing method". First, it is prone to missed detection. Due to the large number of compressed air pipeline joints, each joint needs to be coated with soapy water during the inspection, which inevitably leads to leakage coating and missed inspection. Second, the judgment of seepage/leakage is not sensitive. For small seepage/leakage points, the bubbles are often not obvious, so it is prone to misjudgment; the third is that the judgment results are susceptible to the operator's experience and subjective factors; the fourth is that some of the seepage/leakage points cannot be applied with soapy water. Since the application of soapy water is completely done by hand, some seepage/leakage points (such as high-pressure gas storage tank check valves, split/close control valves, etc.) are often not touched, and some parts cannot be painted due to extremely irregular shapes. . In August 2003, Nanyang Power Supply Company repeatedly encountered leakage coating, missed inspection and inability to detect leaks when dealing with frequent failures of jujube-changing jujube 110 switch, which affected the normal operation of the switch. Fifth, the residual soap trace not only affected the appearance but also It is very easy to cause parts to rust. Principle of “Gas Injection Method†Nanyang Power Supply Company successfully solved the problem of seepage/leakage of pneumatic mechanism by referring to the SF6 gas leak detection method of SF6 circuit breaker body. The principle of "gas injection method" is to add trace SF6 gas to the compressed air of pneumatic mechanism, and use the "SF6 gas leak detector" to check the leakage/leakage of the compressed air system one by one, due to the SF6 leak detector. The sensitivity is very high, very sensitive to SF6 gas. Once the SF6 gas leaks in the detection part of the detection probe, the leak detector will alarm and indicate the leaking part, so that the seepage/leakage point of the pneumatic mechanism can be easily detected. Specific operation method: the pneumatic mechanism is released to the air pump to start working, then the SF6 gas is decompressed to 0.1 MPa, and the pipeline is connected to the air inlet of the air pump. When the air pump is working, the air and SF6 mixed gas are driven into the high pressure gas system of the pneumatic mechanism. . At this time, a certain amount of SF6 gas is mixed into the compressed air of the pneumatic mechanism. Gas to be mixed 1-three-phase communication pipe 4-check valve 9 - working cylinder 12 - air pressure gauge 3 - high pressure safety valve 6, 7, 8 - air pressure switch 11 - high pressure pipe joint 14 - compressed air tank 2 Drain valve 5 - air compressor unit 10 - brake control valve 13 - exhaust pipe, screw plug Figure 1 pneumatic mechanism compressed air system block diagram 1234576811910141312 Qin Weidong, etc.: the new method of pneumatic mechanism seepage / leakage phenomenon is stable, use The “SF6 Gas Leak Detector†detects leaks at each seal, as shown in Figure 2. Since pure SF6 gas is non-toxic and non-corrosive, it is harmless to personnel equipment, so the operation process is very convenient. Black Steel Wheel,Steel Wheel with Factory Price,Steel Wheel JAL Wheel Co., Ltd. , http://www.tj-autoparts.com