CN111486279A - Adjustable ground lining pipeline union joint - Google Patents

Abstract

The invention discloses an adjustable ground-lined pipeline union connection joint, which comprises a male head, a female head, a union and a pipe string. The right port of the male head corresponds to the left port of the pipe string, and the left port of the union The sleeve is hung on the outer wall of the male head, the outer wall of the pipe string is provided with the outer thread of the pipe string, the inner wall of the female head is provided with the inner thread of the female head, the outer wall of the female head is provided with the outer thread of the female head, and the inner wall of the union is provided with the inner thread of the union, so the The union is connected to the female external thread of the female head through its own internal union thread, and the female head is connected to the external thread of the pipe string through its own female internal thread. The invention can facilitate the maintenance of the ground lined pipeline by adjusting the position of the female head on the pipe string to facilitate the replacement of a certain pipeline. The adjustable union connection joint has strong adaptability, compact structure and convenient pipeline replacement operation.

Description

Adjustable Ground Lined Line Union Connections

technical field

The invention relates to the technical field of union joints of petroleum machinery engineering ground lined pipelines, in particular to an adjustable ground lined pipeline union joint.

Background technique

The ground lined pipeline union connection joint is a connecting device that can easily replace the pipeline. As a device for connecting two pipelines, it is possible to replace a certain pipeline without changing the length of the pipeline, which is convenient for maintenance. In order to solve the problems of perforation and scaling caused by corrosion and abrasion of ground pipes, ultra-high molecular weight polyethylene with the characteristics of wear resistance, corrosion resistance, scale inhibition and self-lubrication is used as the lining layer inside the pipeline. At present, the fixed union connection joint of the ground lined pipeline makes the male head and the female head directly clamp the gasket under the action of the tightening force of the union. This connection method is easy to operate, but this fixed connection is used when replacing the pipeline. When the joint connects the two pipelines, it is necessary to change the length of the pipeline, thereby increasing the cost and causing waste.

Application number: 201810216181.X A new type of joint for anti-corrosion lined pipe for oil and gas industry, the device mainly includes: first thread, second thread, left adapter, tight shoulder, double female joint, right adapter, third Thread, fourth thread, safety clearance, among them, the material of the left adapter, double female joint and right adapter are the same and all are corrosion-resistant alloy; The second thread is connected to the left end of the double female joint; the right adapter and the right carbon steel pipe are connected into one through the fourth thread, and then connected to the right end of the double female joint through the third thread; the first thread and the fourth thread also only play the role of connection, while The second thread, the third thread and the fastening shoulders on the double female joint play the role of sealing and connection; the safety gap protects the left and right inner liner pipes, and avoids the left and right linings from being squeezed and damaged during the fastening process. Right liner. The invention is suitable for the technical fields of oil and natural gas gathering and transportation and long-distance transportation engineering.

Application number: 201721422462.8 provides lined anti-corrosion ground pipeline, including steel joint A, steel joint B, connecting cap, one end of steel joint A is welded to the steel pipe, the inner side of the steel pipe and steel joint A is lined, and the inner side of the lined The end is a lining flanging, the inner end of the steel joint A has a flange corresponding to the lining flanging, and the outside of the other end is provided with an external thread; one end of the steel joint B is welded to the steel pipe, and the inner side of the steel pipe and the steel joint B is welded. It is the inner lining, the end of the inner lining is the inner lining flanging, the middle part of the steel joint B has a boss, and the outside of the other end of the steel joint B is the inner lining flanging; the connecting cap is located on the outer side of the steel joint B, connecting The inner diameter of one end of the cap is smaller than the inner diameter of the boss, the inner diameter of the other end of the connecting cap is larger than the inner diameter of the boss, and there is an inner thread corresponding to the outer thread on the inside; the advantages are: it solves the problem of lining collapse and corrosion, and enhances the joint connection. strength at.

Application No.: 201620697621.4 proposes an anti-corrosion pipeline connection structure, including interconnected pipe bodies, flanges are provided at both ends of the pipe body, and the pipe body is provided with an anti-corrosion lining, and the anti-corrosion lining is made of polyamide. Made of tetrafluoroethylene material, the pipe opening on the end face of the flange is set as a stepped opening, the inner diameter of the stepped opening is larger than the inner diameter of the pipe body, and the anti-corrosion lining extends from the inner surface of the pipe body To the stepped mouth, the inner diameter of the anti-corrosion lining at the stepped mouth is smaller than the inner diameter of the stepped mouth and its thickness is higher than the axial depth of the stepped mouth. The inner lining is adapted to be in close contact, and the axially outer end surface of the anti-corrosion lining is in the shape of a curved surface. When the pipe bodies are connected to each other, the anti-corrosion lining is in extrusion contact with a curved surface that is adapted to each other. The purpose of the invention is to provide a pipeline connection structure with good anti-corrosion sealing effect and long anti-corrosion life.

Application No.: 201611181572.X discloses a telescopic pipe joint, including an adjustment sleeve, a front connecting pipe, a rear connecting pipe, a front compression cover, a rear compression cover, a front conical sealing ring, a rear conical sealing ring, and a threaded connection part, two tapered parts, several sealing bodies, several accommodating grooves, a first threaded part, a second threaded part, a first blocking cover and a second blocking cover, the inner walls of both ends of the adjustment sleeve are formed with tapered parts , the inner wall of the adjustment sleeve is provided with a threaded connection part, the two ends of the adjustment sleeve are respectively provided with a front connection pipe and a rear connection pipe, and the rear end of the front connection pipe and the front end of the rear connection pipe are provided with The external thread matched with the threaded connection part, the front connecting pipe is sleeved with a front conical sealing ring located in the conical part of the front end of the adjusting sleeve, and the rear connecting pipe is sleeved with a conical sealing ring located at the rear end of the adjusting sleeve Compared with the prior art, the rear conical sealing ring in the inner part can be easily installed and disassembled, and the sealing effect is good.

Application No.: 201721521510.9 provides a lined pipe joint with adjustable length, the technical solution is: mainly composed of pipe string A1, lined pipe 2 of pipe string A, pipe string A joint 3, coupling 4, sealing gasket 5 , the first O-ring 6, the male and female joints 7, the pipe string B joint 8, the second O-ring 9, the pipe string B lining pipe 10 and the pipe string B11; the beneficial effects of the present invention: the design is reasonable and practical, and can be adjusted The length of the joint is flexible and flexible, which is more convenient for installation, removal and replacement, saving time and effort, reducing labor intensity and improving production efficiency.

The present invention is different from the above disclosed technology.

SUMMARY OF THE INVENTION

The purpose of the invention is to provide an adjustable ground lined pipeline union connection joint, which can facilitate the maintenance of the ground lined pipeline by adjusting the position of the female head on the pipe string to facilitate the replacement of a certain pipeline. The non-connecting joint has strong adaptability, compact structure and convenient operation for replacing pipelines.

In order to achieve the above purpose, the present invention adopts the following technical scheme: the adjustable ground lined pipeline union connection joint includes a male head, a female head, a union, and a pipe string, and the right port of the male head and the left port of the pipe string are Correspondingly, the left port of the union is sleeved on the outer wall of the male head, the outer wall of the pipe string is provided with an outer thread of the pipe string, the inner wall of the female head is provided with an inner thread of a female head, and the outer wall of the female head is provided with an outer thread of a female head, the The inner wall of the union is provided with a union internal thread, and the union is connected to the female head external thread of the female head by its own union internal thread screw type, and the female head is connected to the pipe of the pipe string by its own female head internal thread screw type. Column male thread.

The inner wall of the female head is provided with a first snap ring platform and a second snap ring platform, the outer wall of the pipe column is provided with a first snap shoulder, and the left end face of the first snap ring platform and the right end face of the first snap ring form an axial limit , a sealing gasket is installed on the second snap ring stage.

The outer wall of the male head is provided with an outer card shaft shoulder, the inner wall of the left port of the union is provided with a diameter-reducing snap ring platform, and the right end face of the diameter-reducing snap ring platform and the left end face of the outer card shaft shoulder constitute an axial limit, and the female head is on the left side. The port is empty to cover the outer wall of the right port of the male head, that is, the right end of the male head extends into the left port of the female head, and the two are in clearance fit, and the left end face of the female head and the right end face of the outer card shaft shoulder also form an axial limit. bit.

The inner wall of the male head is fitted with a male head liner, and the inner wall of the pipe string is fitted with a pipe string liner.

The male head lining is turned outward at the male head port to form a male head lining flanging, and the male head lining flanging is in contact with the left end face of the sealing gasket.

The pipe string lining is everted outside the pipe string port to form a pipe string lining flanging, and the pipe string lining flanging is in contact with the right end face of the sealing gasket.

The inner diameters of the male head lining, the sealing gasket and the pipe string lining are the same.

Compared with the prior art, the present invention has the following beneficial effects:

The male head and the pipe string are respectively equipped with a male head lining and a pipe string lining with interference fit, and the lining is flanged to form an end face seal, and a sealing gasket is installed between the two ends; The cylindrical surface is designed with threads, the outer surface of the pipe string is designed with external threads, the internal thread of the female head is connected with the external thread of the pipe string; the internal thread of the union is connected with the external thread of the female head, under the action of the tightening force of the union The end face of the male head and the pipe string clamps the sealing gasket, and the whole joint forms a non-metallic sealing channel, which realizes the continuity of the lining to prevent the corrosion of the metal pipe, and has good anti-corrosion and wear-resistant performance; when replacing the pipeline , without changing the length of the pipeline, the connection of a pipeline can be replaced by adjusting the position of the female head on the pipe string. One end of the pipe string is designed with a shoulder to limit the position of the female head, and a shoulder is designed on the male head to facilitate the union to exert sealing force on the sealing gasket. One end of the male head penetrates into the female head to form a clearance fit, and a sealing gasket is installed between the two end faces of the inner lining after flanging.

The invention can facilitate the maintenance of the ground lined pipeline by adjusting the position of the female head on the pipe string to facilitate the replacement of a certain pipeline. The adjustable union connection joint has strong adaptability, compact structure and convenient pipeline replacement operation.

Description of drawings

Fig. 1 is the structural schematic diagram of the adjustable ground lining pipeline union connecting joint of the present invention at the minimum adjustment position;

FIG. 2 is a schematic structural diagram of the union connecting joint of the adjustable ground lining pipeline of the present invention at the maximum adjustment position.

Marked in the figure: male head 1, union 2, female head 3, pipe string 4, pipe string lining 5, male head lining 6, sealing gasket 7.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to Fig. 1 to Fig. 2, the present invention provides a technical solution: an adjustable ground lined pipeline union connection joint, including a male head 1, a female head 3, a union 2, and a pipe string 4, the right side of the male head is The port corresponds to the left port of the pipe string, the left port of the union is sleeved on the outer wall of the male head, the outer wall of the pipe string is provided with an outer thread of the pipe string, the inner wall of the female head is provided with an inner thread of a female head, and the outer wall of the female head is provided with a female head The outer thread of the head, the inner wall of the union is provided with the inner thread of the union, and the inner thread of the union connects the female head of the female head through its own union inner thread, and the female head passes through its own female head inner thread. Button-type connection to the external thread of the pipe string.

The inner wall of the female head is provided with a first snap ring platform and a second snap ring platform, the outer wall of the pipe column is provided with a first snap shoulder, and the left end face of the first snap ring platform and the right end face of the first snap ring form an axial limit , a sealing gasket 7 is installed on the second snap ring stage.

The outer wall of the male head is provided with an outer card shaft shoulder, the inner wall of the left port of the union is provided with a diameter-reducing snap ring platform, and the right end face of the diameter-reducing snap ring platform and the left end face of the outer card shaft shoulder constitute an axial limit, and the female head is on the left side. The port is empty to cover the outer wall of the right port of the male head, that is, the right end of the male head extends into the left port of the female head, and the two are in clearance fit, and the left end face of the female head and the right end face of the outer card shaft shoulder also form an axial limit. bit.

The inner wall of the male head is fitted with a male head liner 6 , and the inner wall of the pipe string is fitted with a pipe string liner 5 .

The male head lining is turned outward at the male head port to form a male head lining flanging, and the male head lining flanging is in contact with the left end face of the sealing gasket.

The pipe string lining is everted outside the pipe string port to form a pipe string lining flanging, and the pipe string lining flanging is in contact with the right end face of the sealing gasket.

The inner diameters of the male head lining, the sealing gasket and the pipe string lining are the same.

The male head 1 and the pipe string 4 are respectively equipped with a male head lining 6 and a pipe string lining 5 which are interference fit with them, and the lining is flanged to form an end face seal, and a sealing gasket 7 is installed between the two end faces; The inner and outer cylindrical surfaces of the head 3 are designed with threads, the pipe string 4 is designed with an outer thread, the inner thread of the female head 3 is connected with the outer thread of the pipe string 4, and one end of the pipe string 4 is designed with a shoulder to limit the female head 3. Position; the internal thread of union 2 is connected with the external thread of female head 3, and the male head 1 is designed with a shaft shoulder so that under the action of the tightening force of union 2, the male head 1 and the pipe column 4 can clamp the sealing gasket 7, The whole joint forms a non-metallic sealed channel, which realizes the continuity of the lining to prevent the occurrence of corrosion of the metal pipe, and has good anti-corrosion and wear resistance; when replacing a pipeline, it is not necessary to change the length of the pipeline. The position of 3 on the pipe string 4 can facilitate the replacement of the pipeline.

One end of the pipe string 4 is designed with a shaft shoulder to limit the position of the female head 3 , and a shaft shoulder is designed on the male head 1 to exert a sealing force on the gasket through the union 2 .

The internal thread of the female head 3 is connected with the external thread of the pipe string 4, and the position of the female head 3 on the pipe string 4 can be adjusted to meet the length requirement when replacing the pipeline.

One end of the male head 1 penetrates into the female head 3 to form a clearance fit. After the inner thread of the union 2 and the outer thread of the female head 3 are tightened, the male head 1 and the pipe column 4 clamp the sealing gasket 7 to achieve sealing.

The specific working process of this adjustable ground lined pipeline union joint is as follows:

Minimum adjustment position: first install the union 2 on the male head 1, and the female head 3 is installed on the pipe string 4 through the threaded connection, until the position of the female head 3 is restricted by the shoulder of the pipe column and cannot be screwed, the male head 1 and the pipe The column 4 is connected to the pipeline by butt welding, and the male head lining 6 and the pipe column lining 5 with interference fit are respectively installed inside, the lining is flanged to form an end face seal, and a sealing gasket 7 is installed between the two end faces. , install one end of the male head 1 into the hole of the female head 3 to form a clearance fit. The male head 1 is designed with a shaft shoulder so that the union 2 can exert a clamping force on the sealing gasket 7 under the action of the tightening force to achieve Pipeline connection.

Maximum adjustment position: When replacing the pipeline, adjust the female head 3 to move the female head 3 on the pipe string 4 away from the shoulder of the pipe string for a certain distance, and then follow the operation method of the minimum adjustment position to make the two pipes. line connection.

The invention has simple structure and flexible operation. When replacing a certain pipeline, the pipeline can be replaced and connected by adjusting the position of the female head on the pipe string without cutting or lengthening the pipeline.

In the description of the present invention, it should be understood that the orientation indication or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention, rather than indicating or implying that the indicated device or element must have The particular orientation, construction and operation in the particular orientation are therefore not to be construed as limitations of the invention.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. Adjustable ground lined pipeline union connection joint, including male head, female head, union and pipe string, the right port of the male head corresponds to the left port of the pipe string, and the left port of the union is sleeved On the outer wall of the male head, it is characterized in that the outer wall of the pipe string is provided with an outer thread of the pipe string, the inner wall of the female head is provided with an inner thread of a female head, the outer wall of the female head is provided with an outer thread of a female head, and the inner wall of the union is provided with an inner thread of the union , the union is connected to the female head external thread of the female head through its own union internal thread screw type, and the female head is connected to the pipe string external thread of the pipe string through its own female head internal thread screw type. 2 . The adjustable ground lining pipeline union connection joint according to claim 1 , wherein a first snap ring platform and a second snap ring platform are provided on the inner wall of the female head, and a first snap ring platform is provided on the outer wall of the pipe string. 3 . A clamping shoulder, the left end surface of the first clamping ring platform and the right end surface of the first clamping shoulder constitute an axial limit, and a sealing gasket is installed on the second clamping ring platform. 3. The adjustable ground lined pipeline union connection joint according to claim 1 or 2, wherein the outer wall of the male head is provided with an outer clamping shoulder, and the inner wall of the left port of the union is provided with a diameter-reducing clamping ring platform , the right end face of the reduced diameter snap ring platform and the left end face of the outer snap shaft shoulder constitute an axial limit, the left port of the female head is empty to cover the outer wall of the right port of the male head, that is, the right end of the male head extends into the inside of the left port of the female head, And the two are in clearance fit, and at the same time, the left end face of the female head and the right end face of the outer card shaft shoulder also constitute an axial limit. 4 . The adjustable ground lining pipeline union connection joint according to claim 1 or 2 , wherein the inner wall of the male head is fitted with a male head lining, and the inner wall of the pipe string is fitted with a pipe string lining. 5 . 5 . The adjustable ground lining pipeline union joint according to claim 4 , wherein the male head lining is turned outside the male head port to form a male head lining flanging, and the male head lining is turned over. 6 . The edge is in contact with the left end of the gasket. 6 . The adjustable ground lining pipeline union connection joint according to claim 5 , wherein the pipe string lining is turned outside the pipe string port to form a pipe string lining flanging, and the pipe string lining is turned over. 7 . The edge is in contact with the right end of the gasket. 7 . The adjustable ground lining pipeline union connection joint according to claim 6 , wherein the inner diameter of the male head lining, the sealing gasket and the pipe string lining are the same. 8 .

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