An adapter for bellows

Abstract

The invention provides a bellow type adapter, which comprises a body. The body comprises an O-ring set in central axis, a coupling screw, a sealing rubber, a hoop and a hooping nut. The coupling screw has grooves on the outside of the first end of the screw and external threads. The sealing rubber is set in the coupling screw, and the outer wall thereof is raised, and the inner wall thereof has a boss. The hoop is located inside the hooping nut and is ranged side by side with the sealing rubber. The bellow type adapter has the advantages that the adopter adopts a bellow type encapsulation sealing rubber unit, a hoop, a hooping nut and coupling screw interlocking structure instead of in the prior art, snap-out capped bellow type construction, which is not only up to IP68 in Static and dynamic systems, but also remain tolerance in working environment and good anti-drawing force.

Description

technical field [0001] The invention relates to the field of mechanical technology, in particular to an adapter for bellows. Background technique [0002] The cable connector of the bellows protective structure has been widely used in rail locomotives, ships, machine tools, industrial control system wiring and sensors. A "bellows adapter" is used in this connector. The current bellows adapter has the following defects in combined applications: (1) Low IP protection level and poor environmental tolerance, that is, the product is resistant to wind, rain, Snow, salt spray, dust and other environments are not strong; (2) The overall length of the adapter is relatively long, and after connecting with the bellows, the minimum bending arm distance of the cable connector end increases, thereby reducing the dynamic system activity. Section deflection distance, and wiring bending distance of static system; (3) The metal insert injection molding process used in the adapter, the manufa...

AI Technical Summary

Problems solved by technology

A "bellows adapter" is used in this connector. The current bellows adapter has the following defects in combined applications: (1) Low IP protection level and poor environmental tolerance, that is, the product is resistant to wind, rain, Snow, salt spray, dust and other environments are not strong; (2) The overall length of the adapter is relatively long, and after connecting with the bellows, the minimum bending arm distance of the cable connector end increases, thereby reducing the dynamic system activity. Section deflection distance, and wiring bending distance of static system; (3) The metal insert injection molding process used in the adapter, the manufacturing process and process are complicated, the material and processing cost are expensive; and the mechanical strength and the tensile strength of the combined structure with the bellows not tall

Among them, the product with the article number NVNV-M202-6 is the most popular one at present. For this product, there are the following defects: (1) Only a sealing ring is added to the joint of the bellows. Less than IP68, even if it is used in a static system, it can only achieve the effect of IP68 under specific test conditions, which is not practical; (2) The "total length" of the M202-6 type is 39.0mm, minus the thread length 6.0mm, the remaining 33.0 mm (hereinafter defined as the effective length), the outer diameter of the applicable hose is 16mm, and the effective length is 2.1 times closer to the outer diameter of the bellows, which means that the length of the bending arm (starting point) of the bellows will be greater than 33.0mm, which is restricted in the application Bending deflection distance (or angle) of the system; (3) Materials and manufacturing: metal insert injection molding process for polyamide and brass nickel-plated threads; involving machining threads, electroplating, insert injection molding and polyamide formulations, etc. There are many processes, and the process is complicated, the production and material costs are expensive, and there are high requirements for the environment and equipment

The disadvantages of this structure are: (1) the effective pipe diameter is relatively small: see figure 1 , the corrugated hose g and the outer wire joint a respectively penetrate through the two ends of the nut c and are connected through the nut c; The effective pipe diameter of the joint a is set to be smaller than the pipe diameter of the corrugated hose 7, resulting in a pipeline bottleneck; (2) IP protection level and poor environmental tolerance: the first wave of the corrugated hose g is located in the mouth of the snap ring d ring cavity The corrugated ring is formed into a tapered ring stuck on the tapered surface of the ring cavity of the snap ring d by beating waves, and cooperates with the metal ring e, and is hard-fitted (hard-sealed) under the tightening action of the nut c; this hard-fit structure In dynamic systems and high and low temperature environments, the first wave of the corrugated hose g is easily broken (and broken) to affect the seal; (3) O-ring b is sandwiched between the nut c and the outer wire joint a, and there is no effective squeeze The contact surface (or groove) is pressed, and there is no limit extrusion; therefore, the O-ring b may be squeezed out, and the sealing effect cannot be achieved

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