A metal elbow pipe with polyethylene outer anticorrosion and convenient connection

Abstract

The application relates to the technical field of metal elbow pipes, and provides a metal elbow pipe with polyethylene outer anti-corrosion and convenient connection, which comprises universal quick connecting mechanisms and a polyethylene telescopic sleeve pipe, the two universal quick connecting mechanisms are symmetrically arranged, a hollow telescopic pipe group is sealed and communicated between the two universal quick connecting mechanisms, the polyethylene telescopic sleeve pipe is sealed and arranged between the two universal quick connecting mechanisms, and the hollow telescopic pipe group is located in the polyethylene telescopic sleeve pipe, wherein the universal quick connecting mechanism comprises a hollow steering assembly and a butt joint positioning head group, the hollow steering assembly is sealed and communicated with a flange plate group and arranged on one side of the hollow telescopic pipe group, and the butt joint positioning head group is sealed and rotationally communicated on the side of the hollow steering assembly far from the hollow telescopic pipe group. Through the technical scheme, the metal elbow pipe in the prior art has the problems of low installation efficiency and great installation difficulty when the misaligned steel pipes are butt jointed.

Description

Technical Field

[0001] This invention relates to the field of metal pipe bending technology, specifically to a metal pipe with polyethylene outer corrosion protection that is easy to connect. Background Technology

[0002] Metal bends are widely used as key components in modern industry and various engineering applications, with applications covering oil and natural gas transportation, water supply and drainage systems, as well as many fields such as chemical and power industries.

[0003] Currently, most metal bends are connected using flanges or welding. In practice, flange connections require multiple bolts for fixing, which complicates the entire mechanical structure. During installation, uneven bolt stress can easily lead to seal failure, causing fluid leakage and other problems. While welding can guarantee connection strength to a certain extent, it requires on-site hot work, which not only damages the original polyethylene anti-corrosion layer on the surface of the metal bend but also easily causes stress concentration at the weld, reducing the service life of the bend. More importantly, both of these traditional connection methods require high precision in mechanical fitting. When pipe misalignment occurs, the connection difficulty increases significantly, seriously affecting construction efficiency and project quality.

[0004] Furthermore, traditional connection methods (such as flange welding) require secondary treatment of the anti-corrosion layer on-site after the connection is completed. However, due to the limitations of manual operation, air bubbles or poor adhesion between the anti-corrosion layer and the metal substrate are easily generated during the treatment process. In subsequent use, when subjected to external forces such as mechanical vibration, the anti-corrosion layer is easily peeled off, causing the metal bend to lose its anti-corrosion protection, thereby accelerating metal corrosion, shortening the overall service life of the metal bend, and increasing maintenance costs and safety risks. Summary of the Invention

[0005] This invention proposes a metal bend with polyethylene external corrosion protection that is easy to connect, in order to solve the problems mentioned in the background art, namely, the low installation efficiency and high installation difficulty of existing metal bends when connecting misaligned steel pipes.

[0006] The technical solution of the present invention is as follows: a metal bend with polyethylene external anti-corrosion for easy connection, comprising a universal quick-connect mechanism and a polyethylene telescopic sleeve;

[0007] The universal quick-connect mechanism is provided in two parts, which are symmetrically arranged and sealed and connected by a hollow telescopic tube assembly.

[0008] The polyethylene telescopic sleeve is sealed between the two universal quick-connect mechanisms, and the hollow telescopic tube assembly is located inside the polyethylene telescopic sleeve.

[0009] The universal quick-connect mechanism includes a hollow steering component and a docking positioning head assembly;

[0010] The hollow steering assembly is sealed and connected to one side of the hollow telescopic tube assembly via a flange assembly;

[0011] The docking positioning head assembly is sealed and rotatably connected to the side of the hollow steering assembly away from the hollow telescopic tube assembly. Several pipe positioning rods are slidably and sealingly arranged inside the docking positioning head assembly, and the several pipe positioning rods can fix the docking positioning head assembly to one side of the docking pipe.

[0012] As a preferred technical solution of the present invention, the hollow steering assembly includes a female docking steering box, a male docking steering box, and a docking ring;

[0013] One end of the female docking steering box is sealed and connected to one side of the hollow telescopic tube assembly through the flange assembly, and a steering groove is provided on the side of the female docking steering box away from the hollow telescopic tube assembly;

[0014] One end of the male docking steering box is located in the steering groove, and two hollow steering shafts are connected in the steering groove. The male docking steering box is located between the two hollow steering shafts, and one end of the hollow steering shaft is rotatably disposed in the male docking steering box with sealing through it.

[0015] One end of the docking ring is sealed and rotatably connected to one side of the male docking steering box, while the other end is detachably and sealed to the docking positioning head assembly.

[0016] As a preferred technical solution of the present invention, the docking positioning head assembly includes a convex hollow docking head and a positioning limiting part;

[0017] One end of the docking ring can extend into the convex hollow joint and can be detachably and sealed to the convex hollow joint by a number of docking bolts. The pipe positioning rod passes through and is slidably and sealed inside the convex hollow joint.

[0018] The positioning and limiting part is provided in several parts, and each positioning and limiting part corresponds to one of the pipe positioning rods. The positioning and limiting part is set on the convex hollow docking head and is used for limiting and installing the pipe positioning rods.

[0019] Furthermore, based on the aforementioned solution, the positioning and limiting part includes a positioning cover and a positioning cylinder;

[0020] The convex hollow connector is provided with a positioning hole, and the pipe positioning rod can be installed into the convex hollow connector through the positioning hole. The positioning cover is detachably installed in the positioning hole by a number of positioning bolts.

[0021] One end of the positioning cylinder is disposed on the positioning cover, and the other end is in sealed contact with the inner wall of the convex hollow connector. One end of the pipe positioning rod is inserted through and slidably disposed in the positioning cylinder. The positioning cylinder has several adjustment through holes that are connected to the convex hollow connector.

[0022] Based on the aforementioned scheme, the inner diameter of the convex hollow connector is the same as the outer diameter of the metal pipe of the pipe to be connected. The side of the convex hollow connector that contacts the upper surface of the metal bend of the pipe to be connected is provided with at least two rubber sealing gaskets, and the pipe positioning rod is located between at least two rubber sealing gaskets.

[0023] Based on the aforementioned scheme, the convex hollow docking head is equipped with a pressurized oil injection nozzle.

[0024] Based on the aforementioned scheme, the convex hollow joint head is also connected to an oil drain and pressure relief pipe. The oil drain and pressure relief pipe has an external thread on the side away from the convex hollow joint head, and a sealing nut is detachably connected to the internal sealing thread of the external thread.

[0025] Based on the aforementioned scheme, the polyethylene telescopic sleeve is sealed between the two convex hollow joints, and the side of the convex joint away from the polyethylene telescopic sleeve is coated with an anti-corrosion layer.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. In this invention, by setting up a universal quick-connect mechanism, the pipe positioning rod in the docking positioning head group can be pressurized by injecting oil into the docking positioning head group through the oil injection nozzle, so that the pipe positioning rod moves in the direction of docking pipe. Before docking the pipe, it is only necessary to partially peel off part of the outer layer of one side of the pipe to be docked, and expose the metal pipe in the docking pipe. Then, several positioning holes adapted to the pipe positioning rod are opened on the metal pipe. Then, the metal pipe on one side of the docking pipe extends into the convex hollow docking head through the movement of the pipe positioning rod into the corresponding positioning hole, so as to realize the rapid positioning of the universal quick-connect mechanism.

[0028] 2. In this invention, by setting a hollow steering component, the male docking steering box achieves a sealed rotational connection with the female docking steering box through the hollow steering shaft without affecting the flow of the solution in the pipeline. This allows the metal bend to flexibly adjust its angle during connection, adapting to the pipeline docking requirements of different directions and positions. Moreover, in complex pipeline laying environments, it can effectively solve the connection problems caused by the changing pipeline routes, improve the versatility and applicability of the metal bend, and reduce the need for rework or reselection due to incompatible angles. Attached Figure Description

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a partial cross-sectional structural schematic diagram of the present invention;

[0032] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the partial structure at point A in the middle;

[0033] Figure 4 For the present invention Figure 2 A magnified view of the structure at point B in the middle;

[0034] Figure 5 This is a schematic diagram of the structure of the universal quick-connect mechanism and the hollow telescopic tube assembly in this invention.

[0035] Figure 6 This is a schematic diagram of the structure of the docking positioning head assembly and the pipe positioning rod in this invention.

[0036] Figure 7 This is a partial cross-sectional structural diagram of the docking positioning head assembly and the pipe positioning rod in this invention;

[0037] Figure 8 For the present invention Figure 7 A magnified schematic diagram of the local structure at point C;

[0038] Figure 9 This is a schematic diagram of the structure of the present invention in conjunction with the pipe to be connected;

[0039] Figure 10 This is a structural schematic diagram of another state of the present invention.

[0040] In the diagram: 001, Hollow steering assembly; 002, Docking and positioning head assembly;

[0041] 1. Hollow expansion joint assembly; 2. Polyethylene expansion sleeve; 3. Flange assembly; 4. Pipe positioning rod; 5. Female docking steering box; 6. Steering groove; 7. Male docking steering box; 8. Hollow steering shaft; 9. Docking ring; 10. Convex hollow butt joint; 11. Docking bolt; 12. Positioning cover; 13. Positioning bolt; 14. Positioning cylinder; 15. Oil injection nozzle; 16. Oil drain and pressure relief pipe; 17. Sealing nut. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] like Figures 1 to 10 As shown, this embodiment proposes a metal bend with polyethylene external corrosion protection that is easy to connect, including a universal quick-connect mechanism and a polyethylene telescopic sleeve 2.

[0044] As described above, there are two universal quick-connect mechanisms, which are symmetrically arranged. A hollow telescopic tube assembly 1 is sealed and connected between the two universal quick-connect mechanisms. A polyethylene telescopic sleeve 2 is sealed between the two universal quick-connect mechanisms, and the hollow telescopic tube assembly 1 is located inside the polyethylene telescopic sleeve 2.

[0045] Specifically, by setting up a hollow expansion tube assembly 1 in conjunction with a polyethylene expansion sleeve 2, the metal bend has a certain degree of expansion and contraction adjustment capability. This not only makes it easier to connect two misaligned pipes, but also allows for adaptive length adjustment when the pipes expand and contract due to temperature changes, relieving internal stress and preventing pipe damage caused by stress concentration. This improves the stability and durability of the pipeline system. Furthermore, compared to traditional paint corrosion protection, the polyethylene expansion sleeve 2 has better corrosion resistance and service life, while also providing better protection for the hollow expansion tube assembly 1.

[0046] The aforementioned universal quick-connect mechanism includes a hollow steering assembly 001 and a docking positioning head assembly 002. The hollow steering assembly 001 is sealed and connected to one side of the hollow telescopic tube assembly 1 through the flange assembly 3. The docking positioning head assembly 002 is sealed and rotatably connected to the side of the hollow steering assembly 001 away from the hollow telescopic tube assembly 1. Several pipe positioning rods 4 are slidably and sealed inside the docking positioning head assembly 002. The several pipe positioning rods 4 can fix the docking positioning head assembly 002 to one side of the docking pipe.

[0047] The hollow steering assembly 001 includes a female docking steering box 5, a male docking steering box 7, and a docking ring 9. One end of the female docking steering box 5 is sealed and connected to one side of the hollow telescopic tube assembly 1 through the flange assembly 3. A steering groove 6 is provided on the side of the female docking steering box 5 away from the hollow telescopic tube assembly 1. One end of the male docking steering box 7 is located in the steering groove 6. Two hollow steering shafts 8 are connected in the steering groove 6. The male docking steering box 7 is located between the two hollow steering shafts 8. One end of the hollow steering shaft 8 is inserted through and sealed and rotatably installed in the male docking steering box 7. One end of the docking ring 9 is sealed and rotatably connected to one side of the male docking steering box 7, and the other end is sealed and detachably connected to the docking positioning head assembly 002.

[0048] Specifically, by setting up the docking ring 9, male docking turning box 7, hollow turning shaft 8, and female docking turning box 5, the medium can flow sequentially along the docking ring 9, male docking turning box 7, hollow turning shaft 8, and female docking turning box 5 without affecting the normal transportation of the medium. Furthermore, the male docking turning box 7 achieves a sealed rotational connection with the female docking turning box 5 through the hollow turning shaft 8, allowing the metal bend to flexibly adjust its angle during connection to adapt to the pipe docking requirements of different directions and positions. In complex pipeline laying environments, it can effectively solve the connection problems caused by the changing pipeline routes, improve the versatility and applicability of the metal bend, and reduce the need for rework or reselection due to incompatible angles.

[0049] The docking positioning head assembly 002 includes a convex hollow docking head 10 and a positioning limiting part. One end of the docking ring 9 can extend into the convex hollow docking head 10 and can be detachably and sealed to the convex hollow docking head 10 by several docking bolts 11. The pipe positioning rod 4 is slidably and sealed inside the convex hollow docking head 10. Several positioning limiting parts are provided, and each positioning limiting part corresponds to one of the pipe positioning rods 4. The positioning limiting parts are set on the convex hollow docking head 10 and are used for limiting and installing the pipe positioning rods 4.

[0050] The positioning and limiting part includes a positioning cover 12 and a positioning cylinder 14. The convex hollow connector 10 has a positioning hole, and the pipe positioning rod 4 can be installed into the convex hollow connector 10 through the positioning hole. The positioning cover 12 is detachably and sealed in the positioning hole by a number of positioning bolts 13. One end of the positioning cylinder 14 is set on the positioning cover 12, and the other end is in sealed contact with the inner wall of the convex hollow connector 10. One end of the pipe positioning rod 4 is slidably and sealed in the positioning cylinder 14. The positioning cylinder 14 has a number of adjustment through holes that are connected to the convex hollow connector 10.

[0051] Specifically, by setting a positioning cover 12, the installation and replacement of the pipe positioning rod 4 can be facilitated by removing the positioning cover 12. By setting a positioning cylinder 14, the position of the pipe positioning rod 4 can be limited, so that it can only perform linear reciprocating motion, thereby improving the stability of the movement of the pipe positioning rod 4. When the pressure inside the convex hollow connector 10 increases, the medium can enter the positioning cylinder 14 through the adjustment through hole, so that the pipe positioning rod 4 can slide to the side away from the positioning cylinder 14, thereby adjusting the position of the pipe positioning rod 4.

[0052] The inner diameter of the convex hollow connector 10 is the same as the outer diameter of the metal pipe of the pipe to be connected. At least two rubber sealing gaskets are provided on the side of the convex hollow connector 10 that contacts the upper surface of the metal bend of the pipe to be connected, and the pipe positioning rod 4 is located between the at least two rubber sealing gaskets.

[0053] The rubber sealing gasket is mainly used to improve the sealing between the outer wall of the metal pipe and the convex hollow joint 10. In actual use, it can also be used in combination with items such as raw rubber tape to improve the sealing quality.

[0054] It should be noted that the convex hollow connector 10 is equipped with a pressurized oil injection nozzle 15, and the convex hollow connector 10 is also connected to an oil drain and pressure relief pipe 16. The oil drain and pressure relief pipe 16 has an external thread on the side away from the convex hollow connector 10, and a sealing nut 17 is detachably connected to the sealing thread on the external thread.

[0055] Specifically, after installing the pipe positioning rod 4 and positioning cover 12 inside the convex hollow connector 10, hydraulic oil can be added into the convex hollow connector 10 through the oil injection nozzle 15 to pressurize the convex hollow connector 10, thereby adjusting the position of the pipe positioning rod 4. Excess gas inside the convex hollow connector 10 can be released by removing the sealing nut 17.

[0056] When adjusting the position of the pipe positioning rod 4, tighten the sealing nut 17 onto the external thread. By continuously filling the convex hollow connector 10 with hydraulic oil, the pressure inside the convex hollow connector 10 increases, and the pipe positioning rod 4 will move towards one side of the metal pipe. When disassembling the convex hollow connector 10, the sealing nut 17 can be removed, and the hydraulic oil inside the convex hollow connector 10 can be sucked out through the oil drain and pressure relief pipe 16, so that the pipe positioning rod 4 moves back into the convex hollow connector 10.

[0057] As further explained, the polyethylene telescopic sleeve 2 is sealed between the two convex hollow joints 10, and the side of the convex joints away from the polyethylene telescopic sleeve 2 is coated with an anti-corrosion layer.

[0058] Specifically, the polyethylene expansion sleeve 2 is sealed between the two universal quick-connect mechanisms, completely enclosing the hollow expansion tube assembly 1 to form a robust anti-corrosion barrier, isolating the metal bend from external corrosive substances. At the same time, the convex joint is sprayed with an anti-corrosion layer on the side away from the polyethylene expansion sleeve 2, further enhancing the anti-corrosion capability. This dual anti-corrosion structure significantly extends the service life of the metal bend and can further reduce maintenance and replacement costs, making it particularly suitable for working environments with strong corrosiveness and slow flow rates of the medium inside the pipeline.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A metal elbow with polyethylene outer corrosion protection for easy connection, characterized in that, include: Two universal quick-connect mechanisms are provided, and the two universal quick-connect mechanisms are arranged symmetrically. A hollow telescopic tube assembly (1) is sealed and connected between the two universal quick-connect mechanisms. A polyethylene telescopic sleeve (2) is sealed between the two universal quick-connect mechanisms, and the hollow telescopic tube assembly (1) is located inside the polyethylene telescopic sleeve (2). The universal quick-connect mechanism includes: The hollow steering assembly (001) is sealed and connected to one side of the hollow telescopic tube assembly (1) by the flange assembly (3); The docking positioning head assembly (002) is sealed and rotatably connected to the side of the hollow steering assembly (001) away from the hollow telescopic tube assembly (1). Several pipe positioning rods (4) are slidably and sealed inside the docking positioning head assembly (002). The several pipe positioning rods (4) can fix the docking positioning head assembly (002) to one side of the docking pipe. The docking positioning head assembly (002) includes: Convex hollow connector (10); The positioning and limiting part is provided in several parts, and the positioning and limiting part corresponds one-to-one with the pipe positioning rod (4). The positioning and limiting part is set on the convex hollow connector (10) and is used for the limiting and installation of the pipe positioning rod (4). The positioning and limiting part includes: The positioning cover (12) has a positioning hole on the convex hollow connector (10). The pipe positioning rod (4) can be installed into the convex hollow connector (10) through the positioning hole. The positioning cover (12) is detachably installed in the positioning hole by a number of positioning bolts (13). The positioning cylinder (14) has one end set on the positioning cover (12) and the other end sealed to the inner wall of the convex hollow connector (10). One end of the pipe positioning rod (4) is inserted through and sealed to slide inside the positioning cylinder (14). The positioning cylinder (14) has several adjustment holes connected to the convex hollow connector (10). The convex hollow connector (10) is equipped with a pressurized oil injection nozzle (15). The convex hollow connector (10) is also connected to an oil drain and pressure relief pipe (16).

2. The easily connectable metal bend with polyethylene external corrosion protection according to claim 1, characterized in that, The hollow steering assembly (001) includes: The female docking steering box (5) is sealed at one end through the flange group (3) and connected to one side of the hollow telescopic tube group (1). The female docking steering box (5) is provided with a steering groove (6) on the side away from the hollow telescopic tube group (1). The male docking steering box (7) has one end located in the steering groove (6), and the steering groove (6) is connected to two hollow steering shafts (8). The male docking steering box (7) is located between the two hollow steering shafts (8), and one end of the hollow steering shaft (8) is rotatably disposed in the male docking steering box (7) with sealing. The docking ring (9) has one end sealed and rotatably connected to one side of the male docking steering box (7), and the other end is sealed and detachably connected to the docking positioning head assembly (002).

3. A metal bend with polyethylene external corrosion protection for easy connection according to claim 2, characterized in that, One end of the docking ring (9) can extend into the convex hollow connector (10) and can be detachably and sealed to the convex hollow connector (10) by a number of docking bolts (11). The pipe positioning rod (4) is inserted through and slidably disposed in the convex hollow connector.

4. A metal bend with polyethylene external corrosion protection for easy connection according to claim 3, characterized in that, The inner diameter of the convex hollow connector (10) is the same as the outer diameter of the metal pipe of the pipe to be connected.

5. A metal bend with polyethylene external corrosion protection for easy connection according to claim 4, characterized in that, The oil drain and pressure relief pipe (16) has an external thread on the side away from the convex hollow connector (10), and a sealing nut (17) is detachably connected to the sealing thread on the external thread.

6. A metal bend with polyethylene external corrosion protection for easy connection according to claim 5, characterized in that, The polyethylene telescopic sleeve (2) is sealed between the two convex hollow connectors (10).

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