CN201434164Y - Ferrule type pipe joint - Google Patents

Abstract

The ferrule-type pipe joint disclosed by the utility model includes a nut, a sleeve-type ferrule and a joint body. Tapered grooves are respectively opened at the end of the nut and the concave platform of the joint body, and the two ends of the sleeve-type ferrule The outer wall is symmetrically conical, the conical half-cone angle α=13°～28°, the difference between the semi-cone angle of the ferrule and the conical groove of the joint body is 1°-3°, and the two sides of the sleeve Each end has a ring-shaped concave table, the surface of the ring-shaped concave table is at right angles to the inner wall of the ferrule, the depth of the concave table is h=0.3~0.7mm, the difference between the radius of the inner wall of the sleeve and the radius of the concave table is c=0.2~0.4mm, and the sleeve is conical The radius difference b=0.2～0.4mm between the radius of the top of the shape and the radius of the recess. The utility model has the advantages of simple structure, convenient processing and installation, double-line sealing between the ferrule and the metal pipe, and its sealing performance is very reliable.

Description

Ferrule type pipe joint

technical field

The utility model relates to a pipe joint, in particular to a ferrule-type pipe joint used for connecting metal pipe fittings and realizing reliable sealing.

Background technique

Pipe joints are widely used in hydraulic and pneumatic systems in machinery, chemical industry, aviation, aerospace and other fields. In recent years, with the continuous development of deep-sea exploration technology, pipe joints suitable for high-pressure sealing have been widely used in various deep-sea exploration samplers, among which ferrule-type pipe joints are the most widely used. The traditional ferrule-type pipe joint includes a nut, a sleeve-type ferrule and a joint body. There are tapered grooves at the end of the nut and the concave platform of the joint body. The outer wall of the ferrule passes through the cone at the end and the joint body. The conical groove of the joint body is matched, and a single-line seal is formed between the inner wall and the outer wall of the metal pipe to be connected, and the sealing effect is poor. When the pressure is higher than 50MPa, leakage often exists. In deep-sea exploration, it is often required that the detector can maintain good sealing under high pressure to maintain the in-situ pressure of the sample and prevent gas leakage in the sample. Therefore, the traditional ferrule-type pipe joint is not suitable for deep-sea exploration, etc. High pressure applications.

Contents of the invention

The purpose of the utility model is to provide a new ferrule-type pipe joint with a simple structure, which can meet the requirements of reliable sealing in high-pressure applications such as deep-sea exploration.

The purpose of this utility model is achieved in this way: the ferrule-type pipe joint includes a nut, a sleeve-type ferrule and a joint body, and the end of the nut and the concave platform of the joint body are respectively provided with a tapered groove, and the sleeve The outer walls of both ends of the type ferrule are symmetrically conical, the conical half cone angle α = 13° ~ 28°, the half cone angle of the ferrule conical shape is 1° ~ 3° different from the half cone angle of the conical groove of the joint body °, both ends of the sleeve have ring-shaped inner recesses, the ring-shaped recesses are at right angles to the inner wall of the ferrule, the depth of the recess h=0.3~0.7mm, the difference between the radius of the inner wall of the sleeve and the radius of the recess c=0.2~0.4 mm, the difference between the radius of the conical top of the sleeve and the radius of the concave table b = 0.2 ~ 0.4mm.

When in use, put the nut and ferrule in sequence on the end of the metal pipe, and put them together into the tapered groove of the joint body. The external thread on the nut is connected with the thread on the inside of the groove of the joint body. Since the radius difference b between the concave table of the ferrule and the conical top is small, it is easy to deform under the pressure of the nut, so that the conical surface of the conical top of the ferrule and the conical surface of the conical groove of the joint body are aligned. Contact seal, and the greater the deformation, the greater the length of the sealing surface, the better the sealing effect. At the same time, under the pressure of the nut, the vertical sharp angle formed between the inner wall of the ferrule and the concave platform cuts into the outer wall of the pipe to be connected, so that a double-line seal is formed at both ends of the ferrule, which enhances the reliability of the seal.

The advantages of the ferrule pipe joint are: the utility model has a simple structure, and is convenient for processing and installation. The ferrule and the metal pipe are sealed with two lines, which enhances the reliability of the seal. The right angle between the concave table of the ferrule and the inner wall of the ferrule makes it easier for the ferrule to embed into the outer wall of the metal pipe, which is more conducive to the formation of the sealing surface compared with the traditional ferrule fittings, thereby achieving a better sealing effect.

Description of drawings

Figure 1 is a schematic diagram of a ferrule-type pipe joint;

In the figure: 1 is a nut, 2 is a ferrule, 3 is a joint body, and 4 is a connected metal pipe.

Figure 2 is a cross-sectional view of the ferrule.

Detailed ways

Referring to the accompanying drawings, the ferrule-type pipe joint includes a nut 1, a sleeve-type ferrule 2 and a joint body 3. The end of the nut 1 and the recess of the joint body 3 are respectively provided with tapered grooves. The outer walls of both ends of the ferrule 2 are symmetrically conical, and the conical half-cone angle α = 13° to 28°, and the conical half-angle of the ferrule and the conical groove of the joint body differ by 1° to 3° °, both ends of the sleeve have ring-shaped inner recesses, the ring-shaped recesses are at right angles to the inner wall of the ferrule, the depth of the recess h=0.3~0.7mm, the difference between the radius of the inner wall of the sleeve and the radius of the recess c=0.2~0.4 mm, the difference between the radius of the conical top of the sleeve and the radius of the concave table b = 0.2 ~ 0.4mm.

During installation, the nut 1 and the ferrule 2 are sequentially placed on the end of the metal pipe 4, and then inserted into the joint body 3 together, and the nut is tightened by hand. When disassembling, unscrew the nut first, and then take off the metal pipe and the ferrule sleeved outside it together. This pipe joint can be repeated and used many times. Tests were carried out on 10 ferrule-type pipe joints, and the results showed that after disassembly and assembly 5 times, a very good sealing effect can still be achieved when the pressure reaches 70MPa. However, when the traditional ferrule-type pipe joints are subjected to the same test, leakage often occurs.

Claims (1)

1. Ferrule-type pipe joint, including nut (1), sleeve-type ferrule (2) and joint body (3), the end of nut (1) and the concave platform of joint body (3) are respectively separated There is a tapered groove, which is characterized in that the outer walls of the two ends of the sleeve type ferrule (2) are symmetrically conical, the conical half cone angle α=13°～28°, and the conical half cone of the ferrule The difference between the angle and the half-cone angle of the conical groove of the joint body is 1°~3°. Both ends of the sleeve have ring-shaped inner recesses respectively, and the ring-shaped recesses are at right angles to the inner wall of the ferrule. The difference between the radius of the inner wall of the sleeve and the radius of the recess is c=0.2-0.4mm, and the difference between the radius of the conical top of the sleeve and the radius of the recess is b=0.2-0.4mm.

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