CN206130404U - Connection structure of lining fluorine pipe - Google Patents

Abstract

The utility model discloses a connector structure of a fluorine-lined pipe, which comprises a socket pipe for matching sleeved on one end of the pipe fitting, the inner wall of the nozzle of the socket pipe is provided with an internal thread meshing with the external thread of one end of the pipe fitting, the pipe fitting and The inner wall of the sleeve pipe is lined with an anti-corrosion lining, and a coaxial section of the sleeve pipe corresponding to the internal thread is provided with an inner connecting pipe. The outer wall of one end of the inner connecting pipe is sealed with the anti-corrosion lining on the inner wall of the sleeve pipe. The other end of the utility model is provided with a bell mouth whose diameter gradually increases; the bell mouth on the inner connecting pipe of the utility model is inserted into the pipe fitting in a piston-like seal, so that the liquid transfer is transferred from the inner connecting pipe, and the liquid cannot flow to the gap between the pipe fitting and the socket pipe. In the threaded connection gap, it can effectively prevent the parts without anti-corrosion lining on the pipe fittings and socket pipes, and ensure the service life of the pipes; the sealing retaining ring protruding behind the bell mouth forms a The second sealing structure can effectively improve the sealing effect.

Description

Connector structure of fluorine-lined pipe

technical field

The utility model belongs to the technical field of anti-corrosion pipes, in particular to a connector structure of a fluorine-lined pipe.

Background technique

Pipeline transmission of liquid is a technology that is widely used in daily life and industrial production. In order to make the transmission process more stable and avoid the problem of pipeline rupture, the pipeline used is generally used outdoors or in relatively harsh conditions. They are all made of steel, such as galvanized steel pipes, etc. In order to improve the service life of the pipeline and make the pipeline applicable to a wider range, it can withstand the corrosion of the steel pipe by water, the corrosion of the steel pipe by acid and alkali, or the corrosion of some other liquids. Corrosion of steel pipelines, people line the inner wall of the pipeline with fluorine plastic material, and use the structural strength of the steel pipe combined with the resistance of the fluorine plastic material in the tube to various liquids, so that the pipeline lined with fluorine plastic has a long service life and a wide range of applications. And then be widely used.

Compared with ordinary pipes, the tightness of the joints between fluorine-plastic-lined pipes and other pipes is very important, while the pipes in the prior art still use the traditional twisted external thread at one end of the steel pipe and the matching pipe. The internal thread of the double joint or tee joint is connected by thread engagement. Since the pipe will be cut to length according to actual needs, and the internal thread of the joint cannot be lined with fluorine plastic material, this method makes the steel pipe The part of the threaded connection between the end part and the connecting piece is exposed to the liquid being transported, which easily leads to corrosion of the joint part, thereby shortening the service life of the pipeline.

Utility model content

The utility model provides a connector structure for a fluorine-lined pipe, and the technical problem to be solved is that when the traditional fluorine-plastic-lined pipe is docked with the connector, the connecting end does not have the Fluoroplastic lining, and the part of the internal thread in the connector does not have a fluoroplastic lining, so after the pipe fitting and the connector are docked, the threaded part will be directly exposed to the transmitted liquid, thus forming a corrosion-resistant loophole. affect the service life of the pipeline.

In order to achieve the above object, the technical solution adopted by the utility model is:

A connector structure for a fluorine-lined pipe, including a sleeve used to be sleeved on one end of the pipe. The anti-corrosion lining is evenly lined, and the corresponding section of the sleeve pipe that is coaxial with the internal thread is provided with an inner connection pipe. The outer wall of one end of the inner connection pipe is sealed and connected with the anti-corrosion lining layer on the inner wall of the sleeve pipe. The diameter of the bell mouth gradually increases, and the end of the bell mouth on the inner tube can be inserted into the pipe relatively. Axial sliding relative to the seal in the form of a piston.

Further, the outer diameter of the inner connecting pipe is smaller than the inner diameter of the pipe fitting, and the sleeve pipe is sleeved to one end of the pipe fitting, and a sealing retaining ring protrudes behind the bell mouth on the outer pipe wall of the section where the inner connecting pipe is inserted into the pipe fitting.

Further, the inner wall of the bell mouth and the outer wall of the bell mouth intersect at the front end of the bell mouth, the front end of the outer wall of the bell mouth is relatively sealed with the inner wall of the pipe fitting, and the inner wall of the bell mouth is in the inner wall of the pipe fitting. A transition guide section with a diameter gradually reduced is formed between the pipe wall and the inner pipe wall of the inner connecting pipe.

Further, the socket pipe is socketed on the pipe fitting, and an annular cavity is formed between the bell mouth and the sealing retaining ring.

Further, a section of the socket pipe correspondingly provided with an internal thread is coaxially provided with an internal connection pipe made of the same material as the anti-corrosion lining.

Further, the inner connecting pipe and the anti-corrosion lining on the inner wall of the socket pipe are of an integrated structure.

Preferably, the material of the anti-corrosion lining on the inner wall of the pipe fittings and sockets is polyperfluoroethylene propylene.

Compared with the prior art, the utility model has the following advantages:

1. The utility model uses the bell mouth on the inner pipe to be inserted into the pipe fitting in a piston-like seal, so that the liquid transfer between the pipe fitting and the socket pipe is transitioned by the inner pipe, and the liquid cannot pass through the bell mouth and the anti-corrosion lining of the inner lining of the pipe fitting. The sealing gap between the layers flows to the threaded connection gap between the pipe fitting and the socket pipe, thereby effectively preventing the part of the pipe fitting and the socket pipe without the anti-corrosion lining from being exposed to the transported liquid, ensuring the service life of the pipe ;

2. The utility model utilizes the sealing retaining ring protruding behind the bell mouth on the outer pipe wall of the inner connecting pipe to form a second sealing structure between the inner connecting pipe and the inner pipe wall of the pipe fitting, and through the bell mouth and the sealing retaining ring A ring-shaped cavity is formed between the rings, and a sealing air cushion is formed behind the bell mouth through the ring-shaped cavity, which can effectively improve the sealing effect.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the pipe fitting and socket pipe decomposition structure of the present utility model;

Fig. 2 is a schematic cross-sectional view of the connection structure between the pipe fitting and the socket pipe of the present invention;

Among them: 1-pipe fittings, 11-external thread, 2-socket pipe, 21-internal thread, 3-anti-corrosion lining, 4-inner pipe, 41-sealing retaining ring, 42-cavity, 5-bell mouth, 51- Outer orifice wall, 52-inner orifice wall.

detailed description

Below in conjunction with embodiment the utility model is described further.

As shown in Figures 1 and 2, a connector structure for a fluorine-lined pipe includes a socket pipe 2 for matching sleeved on one end of the pipe fitting 1, and the inner wall of the nozzle of the socket pipe 2 is provided with an external thread 11 at one end of the pipe fitting 1 The internal thread 21 that is engaged with each other is lined with an anti-corrosion liner 3 on the inner wall of the pipe fitting 1 and the socket pipe 2, and a section of the socket pipe 2 corresponding to the internal thread 21 is coaxially provided with an anti-corrosion liner 3 made of the same material. The inner connecting pipe 4, the outer wall of one end of the inner connecting pipe 4 is sealed and connected with the anti-corrosion lining 3 on the inner wall of the sleeve pipe 2, and the other end of the inner connecting pipe 4 is provided with a bell mouth 5 whose outer diameter gradually increases, where the upper bell mouth 5 of the inner connecting pipe 4 is located. One end of the bell mouth 5 can be relatively inserted into the pipe fitting 1, and the outer diameter of the most front end of the bell mouth 5 is an interference fit with the inner diameter of the pipe fitting 1. slide.

When the utility model is actually implemented, when the socket pipe 2 is socketed on the pipe fitting 1, the bell mouth 5 on the inner pipe 4 is inserted into the inner pipe hole of the pipe fitting 1 with an interference fit to form a piston-like sealing structure. This realizes the transitional drainage of the liquid transported from the pipe fitting 1 to the sleeve pipe 2 through the inner pipe 4, and the liquid transported in the pipe cannot enter the threaded connection gap between the pipe fitting 1 and the inner sleeve 2, effectively ensuring the overall integrity of the pipe. Anti-corrosion structure.

The outer diameter of the inner connecting pipe 4 is smaller than the inner diameter of the pipe fitting 1, the sleeve pipe 2 is sleeved to one end of the pipe fitting 1, and the inner connecting pipe 4 is inserted into the outer pipe wall of a section of the pipe fitting 1, and a sealing stopper is protruded behind the bell mouth 5 Ring 41, using the sealing retaining ring 41, a second sealing structure is formed between the inner connecting pipe 4 and the inner pipe wall of the pipe fitting 1, and an annular cavity 42 is formed between the bell mouth 5 and the sealing retaining ring 41 A sealing air cushion is formed behind the bell mouth 5 through the annular cavity 42, which can effectively improve the sealing effect.

The inner connecting pipe 4 is integrally formed with the anti-corrosion lining 3 on the inner wall of the socket pipe 2 .

The outer wall 51 of the bell mouth 5 and the inner wall 52 intersect at the front end of the bell mouth 5, and the front end of the outer wall 51 of the bell mouth 5 is relatively sealed with the inner pipe wall of the pipe fitting 1, and the inner wall of the bell mouth 5 The wall 52 forms a transitional guide section with a gradually decreasing diameter between the inner wall of the pipe fitting 1 and the inner wall of the inner connecting pipe 4. The inclined guide structure of the inner wall 52 of the bell mouth 5 is used to realize smooth drainage and prevent the liquid from entering Excessive pressure exerted by the front end of the bell mouth 5 causes leakage and loss of sealing function.

The anti-corrosion lining 3 on the inner wall of the pipe fitting 1 and the socket pipe 2 is made of polyfluoroethylene propylene, and the inner connecting pipe 4 is also made of polyfluoroethylene propylene.

The above are only preferred embodiments of the present utility model, and it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, some improvements and modifications can also be made. It should be regarded as the protection scope of the present utility model.

Claims (7)

1. A connector structure for a fluorine-lined pipe, including a socket for matching at one end of the pipe. The inner wall is lined with an anti-corrosion lining, which is characterized in that: a coaxial section of the sleeve pipe corresponding to the internal thread is provided with an inner connecting pipe, and the outer wall of one end of the inner connecting pipe is sealed and connected with the anti-corrosion lining on the inner wall of the sleeve pipe. The other end of the connecting pipe is provided with a bell mouth whose diameter gradually increases. The end of the inner pipe where the bell mouth is located can be relatively inserted into the pipe fitting. There is an interference fit between the frontmost diameter of the bell mouth and the inner diameter of the pipe fitting. The inner tube hole of the pipe fitting is piston-like and relatively sealed in the axial direction. 2. The connector structure of the fluorine-lined pipe according to claim 1, characterized in that: the outer diameter of the inner connecting pipe is smaller than the inner diameter of the pipe fitting, the socket pipe is sleeved to one end of the pipe fitting, and the inner connecting pipe is inserted into the outer pipe wall of a section of the pipe fitting There is also a sealing retaining ring protruding from the rear of the bell mouth. 3. The connector structure of the fluorine-lined pipe according to claim 2, characterized in that: the inner wall of the bell mouth and the outer wall of the bell mouth intersect at the front end of the bell mouth, and the front end of the outer wall of the bell mouth meets the inner wall of the pipe fitting. Relative to the tight fit, the inner wall of the bell mouth forms a transition guide section with a gradually decreasing diameter between the inner wall of the pipe fitting and the inner wall of the inner connecting pipe. 4. The connector structure of the fluorine-lined pipe according to claim 3, characterized in that: the sleeve is sleeved on the pipe, and an annular cavity is formed between the bell mouth and the sealing retaining ring. 5. The connector structure of the fluorine-lined pipe according to claim 1, characterized in that: a section of the sleeve pipe correspondingly provided with an internal thread is coaxially provided with an internal connection pipe made of the same material as the anti-corrosion lining. 6. The connector structure of the fluorine-lined pipe according to claim 5, characterized in that: the inner connecting pipe and the anti-corrosion lining on the inner wall of the socket pipe are in an integrated structure. 7. The connector structure of the fluorine-lined pipe according to claim 6, characterized in that: the material of the anti-corrosion lining on the inner wall of the pipe fitting and the socket pipe is polyperfluoroethylene propylene.