Electric melting end sealing elbow capable of simultaneously welding single-layer pipe and double-layer pipe

Abstract

The utility model relates to the field of composite pipe electro-fusion welding, in particular to an electro-fusion end-sealed elbow capable of welding a single-layer pipe and a double-layer pipe at the same time. Comprising an elbow body, the elbow body comprises an elbow outer layer, a welding layer and an elbow inner layer from outside to inside, a single-layer pipe welding area is arranged on the inner wall of one end of the elbow body, a double-layer pipe welding area is arranged on the inner wall of the other end of the elbow body, and the double-layer pipe welding area comprises a double-layer pipe outer pipe welding area and a double-layer pipe inner pipe welding area from outside to inside in sequence. The diameter of the double-layer pipe outer pipe welding area is larger than that of the double-layer pipe inner pipe welding area. The double-layer pipe and the single-layer pipe can be welded at the same time, joints and pipelines are reduced, the installation space is obviously saved, the material and process cost is reduced, and the welding work efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of electrofusion welding of composite pipes, and particularly relates to an electrofusion end elbow capable of welding single-layer and double-layer pipes simultaneously. Background Technique

[0002] In the petroleum and chemical industries, the oil transportation system must adopt effective anti-leakage measures to reduce pollution and safety hazards. When traditional single-layer pipes are used for oil transportation, they are easily eroded and damaged, leading to the risk of oil and gas leakage. To address this problem, many gas stations use composite pipes as buried pipelines to enhance the anti-leakage function. Existing fuel dispensers usually need to be connected to single-layer oil pipelines to meet their design and operation requirements. In this case, double-layer composite pipes and single-layer composite pipes require specific interface treatments. The double-layer composite pipe is connected to the single-layer composite pipe through a terminal joint, and then an electrofusion elbow is used to connect the next single-layer pipe at the position where the pipeline direction changes, and finally connected to the fuel dispenser. This series of operations not only increases the complexity and time consumption of construction, but also may increase the construction cost and risk. At the same time, the number of welding points is relatively large, and the quality of the welding points directly affects the safety of the entire system.

[0003] In summary, the existing technology has deficiencies such as low welding efficiency, high cost, and large space occupation, and there is an urgent need for a new solution. In view of this situation, the utility model proposes a new type of electrofusion elbow, which can weld single-layer and double-layer pipes simultaneously, simplifies the connection method, improves the welding efficiency, reduces the construction cost, and provides a more safe, economical, and efficient composite pipe joint product for gas stations. Summary of the Invention

[0004] The present invention aims to provide a new type of electrofusion elbow that can weld double-layer composite pipes and single-layer pipes simultaneously, thereby solving the problems of large space occupation, high cost, and low welding efficiency in the existing technology.

[0005] To solve the above problems, the technical solution of the present invention is as follows: An electrofusion end elbow capable of welding single-layer and double-layer pipes simultaneously, including an elbow main body. The elbow main body is composed of an elbow outer layer, a welding layer, and an elbow inner layer from outside to inside. At both ends of the elbow main body, a single-layer pipe welding area is provided on the inner wall of one end, and a double-layer pipe welding area is provided on the inner wall of the other end. The double-layer pipe welding area includes a double-layer pipe outer pipe welding area and a double-layer pipe inner pipe welding area from outside to inside. The diameter of the double-layer pipe outer pipe welding area is larger than that of the double-layer pipe inner pipe welding area.

[0006] The above-mentioned electrofusion end elbow capable of welding single-layer and double-layer pipes simultaneously is provided with a leakage detection component on the welding layer. The leakage detection component includes a copper nozzle, a nut, and a sealing plug. The copper nozzle of the leakage detection component extends to the outside of the elbow body. The copper nozzle has a thread outside the elbow and is connected to the nut. The inside of the sealing plug is inserted into the copper nozzle, and the outside of the sealing plug is connected to the nut through a snap structure.

[0007] In the above-mentioned electrofusion end elbow capable of welding single-layer and double-layer pipes simultaneously, a sealing ring is provided between the copper nozzle and the inner wall of the elbow body, and a sealing ring is provided between the welding layer and the inner layer of the elbow.

[0008] In the above-mentioned electrofusion end elbow capable of welding single-layer and double-layer pipes simultaneously, the snap structure is that two centrally symmetric hooks are upwardly provided on the outer edge of the nut, and two cylindrical protrusions are horizontally provided on the outer side of the sealing plug. After the sealing plug is inserted, the sealing plug is rotated, and the two cylindrical protrusions will be stuck into the two hooks on the nut.

[0009] In the above-mentioned electrofusion end elbow capable of welding single-layer and double-layer pipes simultaneously, a metal gasket is provided between the nut and the outer surface of the elbow body, and a sealing ring is provided between the metal gasket and the outer surface of the elbow body.

[0010] In the above-mentioned electrofusion end elbow capable of welding single-layer and double-layer pipes simultaneously, circular protrusions are provided at the contact positions of the sealing rings and the elbow body.

[0011] In the above-mentioned electrofusion end elbow capable of welding single-layer and double-layer pipes simultaneously, heating wires are provided on the welding layer, the wiring terminals pass through the outer layer of the elbow and are connected to the heating wires, and dust covers are provided on the wiring terminals.

[0012] In the above-mentioned electrofusion end elbow capable of welding single-layer and double-layer pipes simultaneously, welding indicator rods are respectively provided on the elbow body in the single-layer pipe welding area and the double-layer pipe welding area.

[0013] In the above-mentioned electrofusion end elbow capable of welding single-layer and double-layer pipes simultaneously, positioning blocks are provided on the elbow body.

[0014] In the above-mentioned electrofusion end elbow capable of welding single-layer and double-layer pipes simultaneously, the inner wall of the port of the elbow body for welding the double-layer pipe is in a conical shape, wider on the outside and narrower on the inside.

[0015] Advantages of the present utility model

[0016] The electrofusion elbow of the present invention realizes the simultaneous welding of double-layer pipes and single-layer pipes through an integrated design. Compared with the existing double-layer pipe welding terminal joint, the terminal joint welds the single-layer pipe, the single-layer pipe is then welded with another single-layer pipe using an electrofusion elbow, and finally connected to the fuel dispenser, it reduces the joints and pipelines, significantly saves the installation space, reduces the material and process costs, and improves the welding work efficiency. Brief description of the drawings

[0017] Figure 1 It is a schematic diagram of an electrofusion end - sealing elbow that can weld single - layer and double - layer pipes simultaneously.

[0018] Figure 2 It is a schematic diagram of an electrofusion end - sealing elbow without a leakage detection component that can weld single - layer and double - layer pipes simultaneously.

[0019] Figure 3 It is Figure 2 An enlarged schematic diagram of the circled part in

[0020] Figure 4 A side view of an electrofusion end - sealing elbow that can weld single - layer and double - layer pipes simultaneously.

[0021] Figure 5 It is Figure 4 An enlarged schematic diagram of the circled part in

[0022] Figure 6 It is Figure 5 An enlarged schematic diagram of the circled part in

[0023] Figure 7 It is Figure 3 An enlarged external appearance schematic diagram of the circled part in

[0024] Figure 8 It is a schematic diagram of a sealing plug.

[0025] Figure 9 It is a schematic diagram of a nut.

[0026] Markings in the figure: 1. Elbow body 2. Elbow outer layer 3. Welding layer 4. Elbow inner layer 5. Terminal 6. Reinforcing rib 7. Welding indicator rod 8. Sealing plug 9. Dust cover 10. Single - layer pipe welding area 11. Double - layer pipe outer pipe welding area 12. Double - layer pipe inner pipe welding area 13. Sealing ring 14. Positioning block 15. Electric heating wire 16. Inner wall of the port of the double - layer pipe appearance welding area 17. Circular protrusion 18. Copper nozzle 19. Nut with a hook 20. Metal gasket. Specific implementation method

[0027] Example 1

[0028] As Figures 1-9As shown in the figure, the elbow main body 1 is divided into three parts, namely the elbow outer layer 2, the welding layer 3 and the elbow inner layer 4. The main body 1 is divided into two ends, which are respectively used for welding the single-layer pipe and the double-layer pipe. The single-layer pipe welding area 10 is provided at one end for connecting the single-layer pipe, and the double-layer pipe welding area is provided at the other end for connecting the double-layer pipe. The double-layer pipe welding area includes the double-layer pipe outer pipe welding area 11 and the double-layer pipe inner pipe welding area 12. The diameter of the outer pipe welding area is slightly larger than that of the inner pipe welding area. The welding layer 3 is provided with heating wires 15, and the elbow outer layer 2 is provided with two terminal posts 5 for connecting the heating wires to ensure effective power connection. Dust covers 9 are provided on the two terminal posts 5 to prevent impurities from entering and affecting power conduction. The welding indicator rod 8 can be used to observe the internal welding situation during power-on welding.

[0029] The copper nozzle 18 of the leakage detection component 24 provided between the elbow outer layer 2 and the welding layer 3 is sealed by the sealing plug 8. Its function is that when it is necessary to conduct a leakage detection on the pipeline or export the leakage, the sealing plug 8 can be removed and the leakage detection device can be connected. When there is no need for detection or there is no leakage to be exported, the sealing plug can be inserted. When the sealing plug 8 is inserted into the copper nozzle 18, it can play a role in preventing leakage. If the inner layer of the double-layer pipe leaks, the leakage will finally flow out from the copper nozzle 18 between the two layers of pipes. A sealing ring 13 is provided between the copper nozzle 18 and the inner wall of the elbow to prevent the leakage from leaking outside the elbow. The copper nozzle 18 is provided with threads at the outer end of the elbow and is connected to the nut 19 to play a fixing role. A metal gasket 20 is provided between the nut 19 and the outer end of the elbow. Its function is to increase friction, reduce pressure, prevent loosening and enhance the fastening force. A sealing ring 13 is added between the metal gasket 20 and the outer surface of the elbow to prevent external impurities from leaking into the pipe. In addition, circular protrusions 17 are provided at the positions where the sealing ring 13 contacts the elbow outer layer 2, and its function is to increase the friction between the sealing ring and it, so that the sealing effect is better.

[0030] At the same time, two centrally symmetric hooks are provided upward on the outer edge of the nut 19, forming a fixing device with four cylindrical protrusions on the sealing plug. After inserting the sealing plug 8, rotate the sealing plug 8, and two of the cylindrical protrusions will get stuck in the two hooks on the nut 19. The other two cylindrical protrusions are for convenient manual rotation. The advantage of this fixing device is to prevent the sealing plug 8 from being ejected by the air pressure change inside the elbow, resulting in the leakage flowing out. Sealing rings 13 are provided between both ends of the elbow inner layer 4 and the welding layer 3 to prevent leakage. At the same time, circular protrusions 17 are also provided at the part where the sealing ring 13 contacts the inner wall of the welding layer 3 to increase the friction and strengthen the sealing effect to ensure that there will be no leakage. A positioning block 14 is provided at the appearance welding area at the end of the welding layer for welding the double-layer pipe to prevent the double-layer pipe from being inserted too deep, thus affecting the leakage detection. In addition, reinforcing ribs 6 are provided on the outer side of the elbow main body to enhance the strength of the elbow main body. The inner wall 16 of the port of the elbow outer layer for welding the double-layer pipe is set in a conical shape, wider outside and narrower inside, to facilitate the butt joint between the elbow and the double-layer pipe.

[0031] During use, insert the double-layer pipe into the double-layer pipe welding area. The outer layer and the inner layer of the double-layer pipe are respectively inserted into the outer pipe welding area 11 and the inner pipe welding area 12 of the double-layer pipe. The positioning block 14 positions the double-layer pipe to prevent the double-layer pipe from being inserted too deep. The terminal 5 is connected to the power supply, and the heating wire 15 is heated to weld the double-layer pipe and the double-layer pipe welding area. The welding indicator rod 8 can observe the internal welding situation during the energized welding. The welding method of the single-layer pipe is the same as that of the double-layer pipe. A dust cover 9 is provided on the terminal 5 to prevent impurities from entering and affecting the power supply.

Claims

1. An electric fusion end-sealed elbow capable of welding single-layer and double-layer pipes simultaneously, comprising an elbow body (1), characterized in that: The elbow body (1) comprises, from outside to inside, an elbow outer layer (2), a welding layer (3) and an elbow inner layer (4). At two ends of the elbow body (1), the inner wall of one end is provided with a single-layer tube welding area (10), and the inner wall of the other end is provided with a double-layer tube welding area. The double-layer tube welding areas are, from outside to inside, a double-layer tube outer tube welding area (11) and a double-layer tube inner tube welding area (12). The diameter of the double-layer tube outer tube welding area (11) is greater than the diameter of the double-layer tube inner tube welding area (12).

2. The electric fusion end-sealing elbow capable of welding single and double-layer pipes at the same time according to claim 1 is characterized in that: A leakage detection component (24) is provided on the welding layer (3), and the leakage detection component (24) comprises a copper nozzle (18), a nut (19), and a sealing plug (8). The copper nozzle (18) of the leakage detection component (24) extends to the outside of the elbow body (1), the copper nozzle (18) is provided with a thread on the outside of the elbow, and is connected to the nut (19), the copper nozzle (18) is inserted into the inside of the sealing plug (8), and the outside of the sealing plug (8) is connected to the nut (19) via a snap-fit ​​structure.

3. The electric fusion end-sealing elbow capable of welding single and double-layer pipes at the same time according to claim 2 is characterized in that: A sealing ring (13) is provided between the copper nozzle (18) and the inner wall of the elbow body (1), and a sealing ring (13) is provided between the welding layer (3) and the inner layer (4) of the elbow.

4. The electric fusion end-sealing elbow capable of welding single and double-layer pipes simultaneously according to claim 2 is characterized in that: The buckle structure is that two centrally symmetrical hooks are arranged upward on the outer edge of the nut (19), and four cylindrical protrusions are arranged horizontally on the outer side of the sealing plug (8). After the sealing plug (8) is inserted, the sealing plug (8) is rotated, and two of the cylindrical protrusions are locked into the two hooks on the nut (19).

5. The electric fusion end-sealing elbow capable of welding single and double-layer pipes simultaneously according to claim 2 is characterized in that: A metal gasket (20) is provided between the nut (19) and the outer surface of the elbow body (1), and a sealing ring (13) is provided between the metal gasket (20) and the outer surface of the elbow body (1).

6. The electric fusion end-sealing elbow capable of welding single-layer and double-layer pipes simultaneously according to claim 3 or 5, characterized in that: A circular protrusion (17) is provided at the contact point between the sealing ring (13) and the elbow body (1).

7. The electric fusion end-sealing elbow capable of welding single-layer and double-layer pipes simultaneously according to claim 1 is characterized in that: A heating wire (15) is provided on the welding layer (3), the terminal (5) passes through the elbow outer layer (2) and is connected to the heating wire (15), and a dust cover (9) is provided on the terminal (5).

8. The electric fusion sealing elbow capable of welding single and double-layer pipes at the same time according to claim 1, characterized in that: A welding indicator rod (7) is provided on the elbow body (1) of the single-layer tube welding area (10) and the double-layer tube welding area, respectively.

9. The electric fusion sealing elbow capable of welding single and double-layer pipes at the same time according to claim 1, characterized in that: A positioning block (14) is provided on the elbow body (1).

10. The electric fusion end-sealing elbow capable of welding single-layer and double-layer pipes simultaneously according to claim 1, characterized in that: The inner wall (16) of the port of the elbow body (1) welded with the double-layer pipe is in a conical shape, which is larger on the outside and smaller on the inside.

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