Specification, model and selection of quick connectors for straight pipes and holes
Straight pipes and holes refer to pipe fittings with regular circular shapes and smooth outer or inner walls, such as medical catheters, seamless stainless steel pipes and trachea. When selecting the specifications of quick connector, it is necessary to know the smoothness, tolerance, inner diameter, outer diameter, insertion depth, whether there are obstacles and collisions in the working environment, test requirements (pressure, fluid properties, detection methods) and other information.
Pneumatic quick connector
As shown in the above figure, there are two types of pneumatic quick joints: the joint sealing ring wraps the outer diameter of the pipe fitting, and the internal expansion type (the joint sealing ring goes deep into the pipe fitting) is driven by air pressure. The tail of the joint is provided with a driving air hole, a test liquid port and a fixing hole, and the fixing hole is used for installing the joint on an automatic fixture to form an automatic sealing operation. ?
Manual quick connector
The above is the manual hole sealing method for straight pipes and holes. The bending handle is used to realize the sealing connection and disconnection, which is simple in operation and stable in sealing. It is divided into two ways: outsourcing and internal expansion sealing. The low-pressure model is suitable for air tightness test within 3Bar, and the high-pressure model can be evacuated to 70Bar, which meets the requirements of helium inspection.
The second is the quick joint selection of special-shaped pipes such as flange pipes, flared pipes and fuel pipes.
Because of the variety and uncertain specifications of this kind of pipe fittings, it is necessary to determine the specific parameters when determining the corresponding quick joints.
Pipe fitting type
The type of pipe fittings shown in the above figure can be matched with G70 series connectors of corresponding specifications and models. You need to know the flange diameter, pipe fitting diameter, flange length, working tolerance, test requirements and other information when selecting the type. Among them, the oil guide rail joint conforms to the J2044 standard, which is divided into self-contained valve and non-contained valve (the valve will automatically block when the joint is pulled out to avoid fuel outflow). There is also a G70 non-standard customized connector for sealing connection of metal hoses. Flanged pipe quick connectors are widely used in waterway testing of new energy vehicles and new energy batteries, which can replace the previous way of adding hoses and clamps.
Flanged pipeline quick connector
Three, cylinder filling quick connector specifications
The quick connector for cylinder filling is mainly used for filling inert gases such as helium and nitrogen or medical oxygen in industrial gas filling stations. Generally, it is repetitive work in batches. There are various models of gas bottle mouth, which need to be matched according to the actual application.
Gas cylinder filling quick connector
The use environment pressure of gas cylinder filling quick connector is high, so special attention should be paid to safety protection. G50 series gas cylinder filling quick connector is equipped with safety ring, which can only be inflated when the safety ring is lowered during operation. At the same time, there is a safety pin at the tail of the joint, which will pop up and clamp the joint during filling to prevent it from being damaged by air pressure.
Four. Specification, model and selection of threaded quick connector
Threaded pipes can be divided into internal threads, external threads and tapered threads. According to different national standards, it can be divided into: G pipe thread, G taper pipe thread, NPT American standard taper thread, UNF American standard fine thread, metric M thread, American standard thread SAE, English thread, etc. According to the specific thread specifications, match the appropriate quick connector model.
Thread type
Thread specifications are diverse, and nozzle shapes are different. Taper and thread depth are both factors to be considered. Threaded quick connectors can be divided into three types according to their working modes: sliding sleeve automatic locking, handle pressing and pneumatic driving, and the common types are divided into internal thread and external thread connectors, as shown in the following figure.
Internal thread quick connector
It should be noted that the internal thread quick connector is used to plug the internal thread nozzle, and the thread at the front end of the connector is external thread specification, which may be confused due to different personal habits when matching the connector model. It is best to provide physical drawings, mathematical models or send samples directly.
External thread quick connector
Due to the variety of specifications and models of external thread in industrial production, the shape of nozzle is very different. It is necessary to provide physical drawings, three-dimensional digital-analog drawings and samples to determine the corresponding quick connector model and ensure safe and reliable sealing performance.
Threaded pneumatic quick joint
The threaded pneumatic joint is customized and developed according to the actual needs of users on the basis of the threaded quick joint. Pneumatic drive is adopted, which reduces labor intensity and is more convenient to operate.
Verb (abbreviation of verb) specification and model of quick connector for oil filler.
The shape of the fuel filler is not a common circle, so it is a big problem to seal it during the actual ignition test of the engine. G90 series is a non-standard customized model of oil filler, as shown in the figure below.
Fuel port quick connector
G90 series quick connector for oil filler adopts aerospace grade aluminum alloy, which is lighter and easier to operate. There is an automatic locking valve inside the connector, which will automatically close when the fuel filler is disconnected to avoid fuel leakage.
The connection mode, specifications, model classification, parameters and matters needing attention in type selection of quick connectors sorted out above. Choosing the appropriate quick connector can make the operation of product sealing test and operation test more convenient, and improve the test efficiency and accuracy.