Five structural forms of hydraulic pipe joints

1. Flaring pipe joint. Before assembly, put the connected 6-pipe on the special tool, and then use the nut 2 to press the 3-pipe sleeve and the 6-pipe against the conical surface on the joint body 1 to form a seal. The function of the pipe sleeve is to prevent the pipe from rotating when the nut is tightened. The pipe joint has simple structure, reliable connection, convenient assembly and maintenance, and is suitable for the connection of low-pressure thin-walled pipes such as copper pipes and thin-walled steel pipes.

2. If the casing joint is the structural form of the casing joint. The casing joint is composed of joint body 1, nut 2 and casing 4. The sleeve is a circular-ended metal ring with a sharp blade. When the nut 2 is tightened, the conical contact between the casing and the joint body forms a seal, and at the same time, the surface of the oil pipe 6 is cut to play the role of connection and sealing. This kind of pipe joint has good performance, light weight, small volume, reliable sealing and convenient work, and is widely used in hydraulic system, and the working pressure can reach 32MPa. It requires high precision piping.

3. If the welded pipe joint is the structure and connection of the welded pipe joint, first put the nut 2 on the nozzle 5, and then weld the end of the nozzle 5 and the oil pipe 6. When tightening the nut, put the nozzle and the nozzle. The connector body 1 is connected. There are two forms of sealing at the junction of the nozzle and the joint body: one is to use the spherical surface to seal with the cone surface, as shown in Figure 1(c); the other is to add an O-ring seal to the end face, as shown in Figure 1(d) ) shown. The former has self-alignment, the installation requirements are not strict, but the sealing performance is poor, the operating pressure is not high, and it is suitable for medium and low pressure systems; the latter can be used for high pressure systems, and the operating pressure can reach 32MPa. The welded pipe joint is simple in structure, easy to manufacture and reliable in operation, and does not require high dimensional accuracy of the pipe. But it requires high welding quality.

4. If the hose joint is a hose joint, in addition to the working reliability of the general pipe joint, it should also have vibration tolerance, shock resistance and repeated flexion resistance. There are two common types: detachable and fastened, each of which has three forms: A.B.C. Type A uses welded pipe fittings, type B uses tube fittings, and type C uses flared pipe fittings.

5. When the joint is quickly replaced, a certain part of the pipeline needs to be disassembled frequently, and the quick-change joint can be used. The structure of this joint is relatively complicated and the local resistance loss is large.