Sleeve pipe connector characteristics and sealing principle

Currently at home and abroad have adopted a structure more advanced pipe connections, ie ferrule tube fitting connection method. National Bureau of Standards in 1983 enacted a national universal connectivity standard card sets. Card sets are many types of connections, such as extrusion, plumper, self-supporting, bite fit and so on. According to the National Bureau of Standards issued by standards, our sleeve type connection is extruded and bite fit, its structure consists of the connector body, ferrule and nut three parts. The key part is the card sleeve - a cutting edge with a metal ring (domestic hot water heating with the card sets for the rubber sleeve).
First, the sleeve pipe connector Features
Card sets of pipe joints for feature relies ferrule cutting edge, firmly grip the pipe wall, so that the high pressure fluid inside the tube is fully sealed.
This connector also has a locking structure characteristics, impact resistance, vibration resistance. Bite-fit tube fittings suitable for small diameter high-pressure system. Squeeze tube fittings suitable for medium and low-pressure pipe, such as indoor hot water heating, water supply, hot water, gas pipeline. Currently used aluminum tube is extruded pipe connection tube fitting connections. quick coupling fittings As indoor heating pipes, hot water, water supply, gas pipeline to connect using the above process, reducing the threaded connection, greatly improved the foreman labor intensity, effectively reducing the project cost (due to indoor heating pipe thread connection required union or filament connections, while the use of the card sets of pipe joints can be reduced union or pipe clamps, filament, roots mother, but also reduces the leakage point). Since no special tools and flare welding, flammable, explosive areas and high altitude places pipeline particularly well suited.
Second, sleeve type pipe joint sealing principle (1) bite-fit connector ferrule sealing principle. When the tube is in the form in Figure 4-13 After assembly, the nut hand turn into the buckle, turn the pipe when the pipe and the nut will not turn by hand, indicating the connector body, card sets, pipes and nuts devices are in preparatory work status, and then use a wrench on the lap, the entire assembly is completed. In the joint assembly process, the card sets the external force, pushed into the connector body 24 ° cone hole ferrule end edge taper bound by a radial contraction, so that the outer wall of the pipe sleeve edge cut (cutting depth t = 0.25 ~ 0.5mm), thereby forming an annular groove as shown in Figure 4-13 a, in order to ensure between the tube and the sealing sleeve and connections. Meanwhile ferrule edge side 26 ° outer cone with connector body between completely close quick coupling, as shown in Figure 4-13 form a reliable outer seal band b, guarantee card sleeve and the seal between the connector body. In addition, the nut tightening the compression force generated under the arched central sleeve, spring-like form of a drum, to prevent loosening of the nut due to vibration phenomena. Card sets tight hold of the tail and steel pipe, steel pipe can serve to prevent vibration transmission to the blade end of the ferrule effect. The sealing principle shown in Figure 4-14. This connection structure has a good resistance to shock and vibration performance. Meanwhile, in order to achieve the above functions, card sets should have sufficient hardness and good toughness.