Fluorine-lined joint pipe fitting

Abstract

The utility model discloses a fluorine lining joint pipe fitting which comprises an outer steel pipe and a polytetrafluoroethylene lining pipe, a limiting flange is arranged at one end of the outer steel pipe, a connecting ring is rotatably installed on the limiting flange, a bolt hole is formed in the end face of the connecting ring, and a limiting check ring matched with the end face of the limiting flange is arranged on an inner hole of the connecting ring. A section of extended polytetrafluoroethylene lining pipe extends out of the other end of the outer steel pipe, an elastic sealing ring is fixedly installed at the extending end of the polytetrafluoroethylene lining pipe, external threads are arranged on the outer steel pipe, and a first locking nut and a second locking nut are connected to the external threads in a threaded mode. The outer steel pipe is provided with an external thread capable of adjusting the connecting length. The extending end of the polytetrafluoroethylene lining pipe seals the connecting part through the elastic sealing ring, and it is guaranteed that the threaded connecting part cannot leak due to the pressure of conveyed liquid. The threaded connection part is covered by the lining pipe and cannot be directly exposed in conveyed liquid, so that the corrosion resistance of the connection part is improved, and the service life of the connection part is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline joints, in particular to a fluorine-lined joint pipe fitting. Background Art

[0002] In order to increase the service life of pipelines and make them applicable to a wider range of fields, so that they can withstand the rust of water on steel pipes, the erosion of acid and alkali on steel pipes, or the corrosion of some other liquids on steel pipes, people line the inner wall of the pipeline with fluoroplastic materials, and use the structural strength of the steel pipe combined with the tolerance of the fluoroplastic material in the pipe to various liquids to make the fluoroplastic-lined pipeline have a long service life and a wide range of applications, and thus be widely used. The conventional pipeline connection method is still used in the prior art. Since the pipeline can be cut to length according to actual needs, and the thread of the connector cannot be lined with fluoroplastic materials, this method exposes the threaded connection between the end of the steel pipe and the connector to the transported liquid, which easily leads to corrosion of the joint, thereby shortening the service life of the pipeline. Utility Model Content

[0003] The utility model aims to solve the problems existing in the prior art and provides a fluorine-lined joint pipe fitting, which is convenient for adjusting the connection length and prevents the threaded connection part from being exposed to the transported liquid.

[0004] The utility model solves the technical problem by adopting the following technical solution: a fluorine-lined joint pipe fitting, comprising an outer steel pipe and a polytetrafluoroethylene inner liner pipe, one end of the outer steel pipe is provided with a limiting flange, a connecting ring is rotatably installed on the limiting flange, a bolt hole is provided on the end face of the connecting ring, a limiting retaining ring matched with the end face of the limiting flange is provided on the inner hole of the connecting ring, an extended polytetrafluoroethylene inner liner pipe is extended from the other end of the outer steel pipe, an elastic sealing ring is fixedly installed on the extended end of the polytetrafluoroethylene inner liner pipe, the outer steel pipe is provided with an external thread, a first locking nut and a second locking nut are threadedly connected to the external thread.

[0005] For further improvement, the limiting flange and the connecting ring are provided with positioning holes and pin holes on their circumferential surfaces respectively, and the positioning holes and the pin holes can be circumferentially fixedly connected by means of latch pins.

[0006] For further improvement, a sealing gasket is fixedly mounted on the end surface of the limiting flange, the outer diameter of the sealing gasket is larger than the diameter of the limiting flange, and the inner diameter of the sealing gasket is smaller than the diameter of the limiting flange.

[0007] For further improvement, a bellows is provided between the first locking nut and the second locking nut.

[0008] The beneficial effect of the utility model is that the connecting ring can rotate within the range of the limiting flange. This design allows the position of the connecting ring to be adjusted according to actual needs during the installation process, so that bolt connection can be conveniently performed, and the outer steel pipe is provided with an external thread to adjust the connection length. An elastic sealing ring is fixedly installed on the protruding end of the polytetrafluoroethylene liner tube. Such a design can seal the connection part through the elastic sealing ring during connection to ensure that the threaded connection part will not leak due to the pressure of the conveyed liquid. At the same time, due to the extension of the liner tube, the threaded connection part is covered by the liner tube and will not be directly exposed to the conveyed liquid, thereby improving the corrosion resistance and service life of the connection part. The first locking nut and the second locking nut ensure the stability of the connection length. The sealing and reliability of the connection part are further enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the installation structure of the utility model;

[0010] Explanation of the accompanying drawings: 1. outer steel pipe, 2. polytetrafluoroethylene lined pipe, 3. limiting flange, 4. connecting ring, 5. limiting retaining ring, 6. elastic sealing ring, 7. first locking nut, 8. second locking nut, 9. latch, 10. sealing gasket, 11. bellows. DETAILED DESCRIPTION

[0011] The utility model is further described below in conjunction with the accompanying drawings:

[0012] See attached Figure 1 : In this embodiment, a fluorine-lined joint pipe fitting comprises an outer steel pipe 1 and a polytetrafluoroethylene liner pipe 2, one end of the outer steel pipe 1 is provided with a limiting flange 3, a connecting ring 4 is rotatably installed on the limiting flange 3, a bolt hole is provided on the end face of the connecting ring 4, and a limiting retaining ring 5 matching the end face of the limiting flange 3 is provided on the inner hole of the connecting ring 4. An extended polytetrafluoroethylene liner pipe 2 extends from the other end of the outer steel pipe 1, and an elastic sealing ring 6 is fixedly installed on the protruding end of the polytetrafluoroethylene liner pipe 2. The outer steel pipe 1 is provided with an external thread, and a first locking nut 7 and a second locking nut 8 are threadedly connected to the external thread.

[0013] Working principle: A limiting flange 3 is provided at one end of the outer steel pipe 1, which is a key component for determining the position of the connecting ring 4. The existence of the limiting flange 3 limits the axial movement range of the connecting ring 4, ensuring that the connecting ring 4 rotates within a certain range. A limiting retaining ring 5 is provided on the inner hole of the connecting ring 4, which cooperates with the end face of the limiting flange 3, which ensures that the connecting ring 4 will not be separated from the limiting flange 3 when rotating. The connecting ring 4 is installed on the limiting flange 3 of the outer steel pipe 1, and a bolt hole is provided on its end face, which is used to be fixedly connected with the connecting ring 4 on the other side or the flange of other equipment through bolts.

[0014] The outer steel pipe 1 is connected to the inner thread hole of the pipe fitting through an external thread. When the connection length needs to be adjusted, it can be achieved by rotating the outer steel pipe 1. The adjustment of the connection length can be precisely controlled. The first locking nut 7 and the second locking nut 8 can be used to lock the outer steel pipe 1 and the connecting ring 4 respectively. The design of these two locking nuts increases the stability of the connection and prevents the connection from loosening due to vibration or other external forces. An extended section of polytetrafluoroethylene liner tube 2 extends from the other end of the outer steel pipe 1, and an elastic sealing ring 6 is fixedly installed on the extended end of this section of the liner tube. The function of the elastic sealing ring 6 is to provide sealing during connection to prevent liquid leakage. The material properties of the polytetrafluoroethylene liner tube 2 make it have good corrosion resistance. At the same time, the elastic sealing ring 6 can adapt to different pressure changes during connection to maintain the sealing effect.

[0015] The fluorine-lined joint pipe fitting realizes flexible adjustment of the connection length through the cooperation of the outer steel pipe with external threads and the limit flange 3 and the connection ring 4, and at the same time improves the sealing and corrosion resistance of the connection part by the combination of the polytetrafluoroethylene liner pipe 2 and the elastic sealing ring 6. The left and right locking design of the first locking nut 7 and the second locking nut 8 further enhances the stability and reliability of the connection.

[0016] The circumferential surfaces of the limiting flange 3 and the connecting ring 4 are respectively provided with positioning holes and pin holes, and the positioning holes and the pin holes can be circumferentially fixedly connected by the plug pin 9. The design of the positioning holes and the pin holes allows the plug pin 9 to be accurately inserted, thereby ensuring the accurate position of the connecting ring 4 on the limiting flange 3 of the outer steel pipe 1. This precise positioning is crucial to ensure the installation quality of the pipe fittings and the reliability of operation.

[0017] The positioning hole and the pin hole are connected by the latch 9, so that the length of the outer steel pipe can be easily adjusted by rotation. When the length needs to be adjusted or aligned for bolt connection, the connecting ring 4 and the limiting flange 3 can be quickly separated by removing the latch 9, so as to achieve quick docking. This design allows the position of the connecting ring 4 to be adjusted according to actual needs under different working conditions to adapt to different installation requirements and space restrictions. This flexibility enables the pipe fittings to be widely used in a variety of different pipeline systems.

[0018] The end surface of the limiting flange 3 is provided with a sealing gasket 10 fixedly mounted thereon, the outer diameter of the sealing gasket 10 is larger than the diameter of the limiting flange 3, and the inner diameter of the sealing gasket 10 is smaller than the diameter of the limiting flange 3. The main function of the sealing gasket 10 is to provide an additional sealing effect when the pipe fittings are connected. The size design of the sealing gasket 10 ensures that it can form a tight sealing interface between the limiting flange 3 and the connecting ring 4 to prevent liquid or gas from leaking through the connection part.

[0019] Since the outer diameter of the sealing gasket 10 is larger than the limiting flange 3, it can form a compression seal between the connecting ring 4 and the outer steel pipe 1, while the inner diameter is smaller than the limiting flange 3, which ensures that the sealing gasket 10 can fit tightly on the end face of the limiting flange 3 during installation, thereby forming an effective sealing barrier at the connection part of the pipe fitting, thereby enhancing the sealing performance and reliability of the entire pipeline system.

[0020] A bellows 11 is provided between the first locking nut 7 and the second locking nut 8, and both ends of the bellows 11 are sleeved on the nuts. The main function of the bellows 11 is to improve the sealing and durability of the entire pipeline system. The bellows 11 can be used as a protective layer to protect the threaded connection from direct influence of the external environment, such as chemical corrosion or physical damage, and further enhance the service life and reliability of the pipe fittings.

[0021] Although the present invention has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A fluorine-lined joint pipe fitting, comprising an outer steel pipe (1) and a polytetrafluoroethylene inner lining pipe (2), characterized in that: A limiting flange (3) is provided at one end of the outer steel pipe (1), a connecting ring (4) is rotatably mounted on the limiting flange (3), a bolt hole is provided on the end face of the connecting ring (4), a limiting retaining ring (5) matching the end face of the limiting flange (3) is provided on the inner hole of the connecting ring (4), a section of an extended polytetrafluoroethylene liner tube (2) is extended from the other end of the outer steel pipe (1), an elastic sealing ring (6) is fixedly mounted on the extended end of the polytetrafluoroethylene liner tube (2), an external thread is provided on the outer steel pipe (1), a first locking nut (7) and a second locking nut (8) are threadedly connected to the external thread.

2. A fluorine-lined joint pipe fitting according to claim 1, characterized in that: Positioning holes and pin holes are respectively provided on the circumferential surfaces of the limiting flange (3) and the connecting ring (4), and the positioning holes and the pin holes can be circumferentially fixedly connected by means of a latch pin (9).

3. A fluorine-lined joint pipe fitting according to claim 1, characterized in that: A sealing gasket (10) is fixedly mounted on the end surface of the limiting flange (3); the outer diameter of the sealing gasket (10) is larger than the diameter of the limiting flange (3), and the inner diameter of the sealing gasket (10) is smaller than the diameter of the limiting flange (3).

4. A fluorine-lined joint pipe fitting according to claim 1, characterized in that: A bellows (11) is provided between the first locking nut (7) and the second locking nut (8).

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