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Five structural forms of hydraulic pipe joints
Release time:
2022-07-20 16:24
The hydraulic pipe joint is the connection between the oil pipe and the oil pipe. The connection between the oil pipe and the hydraulic component should meet the requirements of firm connection, reliable sealing, small shape and size, small pressure drop, large flow capacity, and easy installation and disassembly. Therefore, full attention should be paid to pipe joints. Hydraulic pipe joints with high quality and good sealing are an important reason for the leakage of hydraulic systems!
What are the five structural forms of hydraulic pipe joints? In hydraulic systems, flange connections are usually used for metal pipes with an outer diameter greater than 50mm. For the connection of small-diameter tubing and pipe joints, there are many kinds of commonly used pipe joints, which can be divided into straight-through, angle-through, three-way, four-way, etc. according to the number of passages and flow direction; Different connection methods can be divided into flare type, welding type, ferrule type, etc.
Ordinary fine thread can be used for the connection between pipe joints and other components. For high-pressure systems, combined sealing gaskets can be used to seal the joint body and connecting parts; for medium and low-pressure systems, tapered threads can be used directly to connect with the body.
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 the properties of vibration tolerance, impact resistance and repeated flexion and extension 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. This joint structure is more complicated and the local resistance loss is large.
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