Novel two-ferrule tube fitting

Abstract

The invention provides a novel two-ferrule tube fitting which is formed by a fitting body, nuts, front ferrules and rear ferrules. The novel two-ferrule tube fitting is characterized in that the front ends of the front ferrules are matched with horn mouths of the fitting body, and the front ends of the rear ferrules make contact with the inner arc surfaces of the rear ends of the front ferrules. The nuts are screwed onto the fitting body, so that included angles are formed between the oblique planes at the bottommost portions of the nuts and the perpendicular surfaces of the rear ends of the rear ferrules. Tubes are inserted in from the tails of the nuts and abut against inner steps of the fitting body. When the nuts are screwed tightly, the nuts propel the front ferrules, enable the front ends of the front ferrules to shrink under the action of the horn mouths of the fitting body and enable the tubes to be pressed in, and then the first seal and the first tightening function are achieved. When the nuts are continuously fastened, the force exerted on the rear ferrules is increased, the arc surfaces of the front ends of the nuts and the inner arc surfaces of the rear ends of the rear ferrules are extruded to shrink, the included angles between the oblique planes at the bottommost portions of the nuts and the perpendicular surfaces of the rear ends of the rear ferrules are gradually eliminated to produce lever acting force and enable the front ends of the rear ferrules to be clamped into the tube better, and then the second seal and the second tightening function are achieved. Connecting strength and sealing performance are more reliable.

Description

technical field [0001] The invention relates to the connection, pressure resistance, sealing, design and manufacture of circular pipes, and is widely used in pipelines of industry, machinery, engineering equipment and the like. . Background technique [0002] At present, the widely used metal pipe connection methods include threaded, welded, flared, ferrule and other pipe joints, and different connection forms and joints are used according to different working conditions and conditions. However, in today's industrialization and intensification, due to the advantages of ferrule-type pipe joints, such as good connection and sealing, and convenient and quick installation and operation, its application range and number of uses are constantly increasing, and higher requirements are also put forward. For example, the original double ferrule type pipe joint has high requirements on pipe precision and hardness, strong installation technology, large installation torque and other unf...

AI Technical Summary

Problems solved by technology

For example, the original double ferrule type pipe joint has high requirements on pipe precision and hardness, strong installation technology, large installation torque and other unfavorable factors, which affect a wider range of popular applications.

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