CN210069223U

CN210069223U - Steel-plastic adapter

Info

Publication number: CN210069223U
Application number: CN201920934265.7U
Authority: CN
Inventors: 庄家荣; 吴大伟
Original assignee: Jiangsu Jiaxin Gas Equipment Co Ltd
Current assignee: Jiangsu Jiaxin Gas Equipment Co Ltd
Priority date: 2019-06-20
Filing date: 2019-06-20
Publication date: 2020-02-14
Anticipated expiration: 2029-06-20

Abstract

The utility model discloses a crossover sub is moulded to steel, include: the plastic connecting pipe is arranged in the ground and is connected with the plastic pipe, and the 90-degree steel inclined pipe is fixedly connected with the plastic connecting pipe through a connecting part and extends out of the ground to be connected with a steel pipe on the ground; the connecting part comprises a stop block fixed at one end of the 90-degree steel askew pipe and a sleeve fixedly connected with the outer side wall of one end of the plastic connecting pipe, and the sleeve is sleeved at one end of the 90-degree steel askew pipe and is tightly attached to the stop block; the outer sides of the sleeve and the stop block are also tightly attached and sleeved with steel sleeves. The utility model discloses do not influence the internal diameter of pipeline, do not influence the flow area of pipeline promptly, use the circulation ability that also can not influence the pipeline in trunk line engineering, can still exert the big advantage of plastic conduit circulation ability.

Description

Steel-plastic adapter

Technical Field

The utility model relates to a pipeline accessory especially relates to a crossover sub is moulded to steel.

Background

The existing gas pipe made of polyethylene raw materials is widely applied in China, and a steel-plastic transition joint for connecting a polyethylene pipeline and a steel part is indispensable. In engineering construction, the problem of connection between a plastic pipe and a steel pipe is often encountered. One engineering scheme is flange connection, and the other method is steel-plastic transition connection.

The flange connection is a simple and easy scheme, but bolts used for the flange connection are difficult to be antiseptic, and a sealing ring used for the flange connection has the problem of easy aging. The steel-plastic transition pipe is a better solution, adopts an integrated connection process, and has no defects existing in mechanical connection. The existing steel-plastic transition pipe mostly adopts a 90-degree steel bent pipe, the traditional steel-plastic transition product structure is that a steel pipe is inserted into a plastic pipe, and due to the design of pressure-bearing capacity, the steel pipe needs to keep enough wall thickness, so that the flow area of the pipeline is reduced, the flow capacity of the pipeline is influenced by the application of the steel pipe in the main pipeline engineering, and the advantage of large flow capacity of the plastic pipeline cannot be exerted.

Disclosure of Invention

Aiming at the technical problem, the technical scheme provides the steel-plastic adapter which can effectively solve the problem.

The utility model discloses a following technical scheme realizes:

a steel-plastic crossover joint, comprising: the plastic connecting pipe is arranged in the ground and is connected with the plastic pipe, and the 90-degree steel bent pipe is fixedly connected with the plastic connecting pipe through a connecting part, extends out of the ground and is connected with a steel pipe on the ground; the connecting part comprises a stop dog fixed at one end of the 90-degree steel elbow and a sleeve fixedly connected with the outer side wall of one end of the plastic connecting pipe, and the sleeve is sleeved at one end of the 90-degree steel elbow and tightly attached to the stop dog.

Further, the sleeve conforms to the inner and outer diameters of the stop.

Further, a steel sleeve is tightly attached and sleeved on the outer sides of the sleeve and the stop block; the length of the steel sleeve is consistent with the total length of the sleeve and the stop block.

Further, the outer side of the steel sleeve is wrapped with a heat-shrinkable sleeve; one end of the thermal shrinkage sleeve extends to the 90-degree steel bent pipe, and the other end of the thermal shrinkage sleeve extends to the plastic connecting pipe.

Furthermore, the thermal shrinkage sleeve is sleeved on the 90-degree steel bent pipe and extends to the upper side of the unearthed position.

Furthermore, the heat shrinkable sleeve is made of a plastic film made of PE materials.

Furthermore, an external thread is arranged on one side, close to the plastic connecting pipe, of the stop block at the end part of the 90-degree steel bent pipe, and the inverted opening of the external thread faces to the 90-degree stop block.

Furthermore, a groove is formed between the external thread and the stop block on the 90-degree steel elbow, and a sealing ring is sleeved in the groove.

Furthermore, the end part of one end of the plastic connecting pipe is also provided with an inner expanding pipe in the inner diameter at the position of the connecting part.

Advantageous effects

The utility model provides a pair of steel is moulded crossover sub, compare with prior art, it has following beneficial effect:

(1) the steel-plastic conversion piece is connected with the sleeve fixed on the plastic connection pipe through the stop block fixed on the steel pipe, and one end of the steel pipe is inserted into the sleeve to be connected, so that the steel-plastic conversion piece of the technical scheme can not influence the inner diameter of a pipeline, namely the flow area of the pipeline is not influenced, the flow capacity of the pipeline can not be influenced even if the steel-plastic conversion piece is applied in the main pipeline engineering, and the advantage of high flow capacity of the plastic pipeline can be still exerted.

(2) The steel sleeve is sleeved on the outer sides of the sleeve and the stop block, and the steel sleeve is arranged, so that the stability and the sealing performance of the connecting part are improved; the outer side of the steel sleeve is also provided with the heat-shrinkable sleeve, and the heat-shrinkable sleeve is arranged, so that the stability and the sealing property of the connecting part are further improved; in addition, the thermal shrinkage sleeve adopts a PE plastic film, the corrosion resistance of the steel pipe part is improved, and the service life of the pipeline connecting piece is prolonged.

(3) The arrangement of the external threads at the end part of the 90-degree steel elbow increases the contact area of the connecting part, increases the friction force between the connecting part and the connecting part, and increases the stability of the connecting part; the design that the back cut of external screw thread is towards the dog, when processing, be convenient for press 90 steel return bends with plastic adapter tube on.

(4) Due to the design of the sealing ring, the sealing performance between the external threads in the connecting part and the inner wall of the pipe sleeve is improved, so that the connecting part is more tightly connected.

(5) The design of the inner expanding pipe can enable the inner wall of the plastic connecting pipe to be attached to the thread of the 90-degree steel bent pipe more tightly after the connecting parts are connected. Further increasing the tightness of the connection.

Drawings

Fig. 1 is a schematic cross-sectional view of the overall structure of the present invention.

Fig. 2 is a schematic structural cross-sectional view of a 90 ° steel elbow pipe according to the present invention.

Fig. 3 is a schematic cross-sectional view of the structure of the plastic connecting tube according to the present invention.

Reference numbers in the drawings: 1-plastic connecting pipe, 11-sleeve, 2-90-degree steel bent pipe, 21-stop block, 22-external thread, 23-groove, 24-sealing ring, 3-connecting part, 31-steel sleeve and 32-heat shrinkable sleeve.

Detailed Description

The technical solution 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. The described embodiments are only some, but not all embodiments of the invention. Under the prerequisite that does not deviate from the design concept of the utility model, the ordinary person in the art should fall into the protection scope of the utility model to the various changes and improvements that the technical scheme of the utility model made.

Example (b):

as shown in fig. 1 to 3, a steel-plastic crossover joint, comprising: the plastic connecting pipe 1 is arranged in the ground and connected with the plastic pipe, and the 90-degree steel bent pipe 2 is fixedly connected with the plastic connecting pipe 1 through the connecting part 3, and the 90-degree steel bent pipe 2 extends out of the ground and is connected with a steel pipe on the ground; the plastic connecting pipe 1 and the 90-degree steel elbow pipe 2 have the same inner diameter and outer diameter.

The connecting portion 3 comprises a stop 21 welded and fixed at one end of the 90-degree steel elbow pipe 2, an external thread 22 is arranged on one side, close to the plastic connecting pipe 1, of the stop 21, the inverted opening direction of the external thread 22 is the stop 21, a groove 23 is arranged between the external thread 22 and the stop 21, and a sealing ring 24 is sleeved in the groove 23. The connecting part 3 also comprises a sleeve 11 fixedly connected with the outer side wall of one end of the plastic connecting pipe 1, the sleeve 11 is sleeved on the 90-degree steel bent pipe 2, and the top end of the sleeve is tightly attached to the stop block 21; the sleeve 11 conforms to the inner and outer diameters of the stop 21. A steel sleeve 31 is tightly fitted and sleeved on the outer sides of the sleeve 11 and the stop block 21; the length of the steel sleeve 31 corresponds to the total length of the casing 11 and the dogs 21. The outer side of the steel sleeve 31 is wrapped with a heat shrinkable sleeve 32; one end of the thermal shrinkage sleeve 32 extends to the 90-degree steel bent pipe 2, and the thermal shrinkage sleeve 32 is arranged on the 90-degree steel bent pipe 2 and extends to the upper side of the unearthed position; the other end of the heat shrink sleeve 32 extends over the plastic mouthpiece 1. The heat shrinkable sleeve 32 is a plastic film made of PE.

The end of one end of the plastic connecting pipe 1 is also provided with an inner expanding pipe in the inner diameter at the position of the connecting part 3.

Claims

1. A steel-plastic crossover joint, comprising: the plastic connecting pipe (1) is arranged in the ground and connected with the plastic pipe, and the 90-degree steel bent pipe (2) is fixedly connected with the plastic connecting pipe (1) through a connecting part (3), and the 90-degree steel bent pipe (2) extends out of the ground and is connected with a steel pipe on the ground; the method is characterized in that: connecting portion (3) including fixing dog (21) in 90 steel return bends (2) one end to and with plastic linkage pipe (1) the lateral wall fixed connection's of one end sleeve pipe (11), sleeve pipe (11) cover on 90 steel return bends (2), its top closely laminates with dog (21).

2. The steel-plastic crossover joint of claim 1, wherein: the sleeve (11) is in accordance with the inner and outer diameters of the stop (21).

3. A steel-plastic crossover joint according to any one of claims 1 or 2, characterized in that: a steel sleeve (31) is tightly fitted and sleeved on the outer sides of the sleeve (11) and the stop block (21); the length of the steel sleeve (31) is consistent with the total length of the sleeve (11) and the stop block (21).

4. A steel-plastic crossover joint as defined in claim 3 wherein: the outer side of the steel sleeve (31) is wrapped with a heat-shrinkable sleeve (32); one end of the thermal shrinkage sleeve (32) extends to the 90-degree steel elbow (2), and the other end of the thermal shrinkage sleeve (32) extends to the plastic connecting pipe (1).

5. The steel-plastic crossover joint of claim 4, wherein: the heat shrinkable sleeve (32) is arranged on the 90-degree steel bent pipe (2) and extends to the upper side of the unearthed position.

6. The steel-plastic crossover joint of claim 4, wherein: the heat shrinkable sleeve (32) is made of a plastic film made of PE material.

7. The steel-plastic crossover joint of claim 1, wherein: the top of the plastic connecting pipe (1) is provided with an external thread (22) on the upper side of the stop block (21), and the reverse opening of the external thread (22) faces the stop block (21).

8. The steel-plastic crossover joint of claim 7, wherein: on 90 steel return bend (2), be provided with recess (23) between external screw thread (22) and dog (21), sealing washer (24) are established to the cover in recess (23).

9. The steel-plastic crossover joint of claim 1, wherein: the end part of one end of the plastic connecting pipe (1) is also provided with an inner expanding pipe in the inner diameter at the position of the connecting part (3).