Three-section welded PE pipe structure

Abstract

The utility model discloses a three-section welded PE (Poly Ethylene) pipe structure, and relates to a welding technology in a construction process of a PE pipe of a water supply pipe network in cities and towns, in particular to a construction structure of three-section PE pipe electric fusion welding. Comprising a clamping mechanism for fixing a PE pipe (1) and an electric melting pipe hoop (2) on the same axis, and the clamping mechanism comprises a support (3), a pipe hoop clamping ring (4) and a PE pipe clamping ring (5); the upper surface of the support is a plane, the plane is provided with a pipe hoop groove for accommodating an electric melting pipe hoop, two ends of the pipe hoop groove are provided with PE pipe grooves for accommodating two PE pipe joints, the lower surface of the support is a cambered surface, and the cambered surface and the circle center of the PE pipe grooves form an eccentric structure; and a PE pipe clamping ring and a pipe hoop clamping ring which are arranged above the PE pipe groove and the pipe hoop groove are used for fixing the PE pipe and the electric melting pipe hoop in the support groove. The problems that in the prior art, due to the fact that butt joint and a PE pipe and an electric melting pipe hoop are in a suspended state in a groove, the electric heating pipe fitting is separated in the welding and cooling process due to the influence of external vibration, welding seam cracks are caused, welding seams are not tight, and welding seam firmness and integrity are poor are solved.

Description

Technical Field

[0001] The utility model relates to the welding technology in the construction process of PE pipes for urban water supply networks, and specifically relates to the construction structure of electrofusion welding of three sections of PE pipes. Background Art

[0002] PE pipes are extruded and formed in one step by a plastic extruder using special polyethylene as the raw material, and are applied to urban water supply networks, irrigation water diversion projects, and agricultural sprinkler irrigation projects. They are especially suitable for plastic pipes in acid and alkali resistant and corrosion resistant environments. The commonly used connection method between PE pipes is electrofusion connection. Electrofusion connection is to make the special electrofusion fitting (i.e., welding pipe hoop or electrofusion pipe hoop) with internal buried resistance wire be in close contact with the connection part of the PE pipe and energize. The PE pipe heats the connection part through the internal buried resistance wire, melts it into one body until the joint cools; electrofusion connection can be used to connect with polyethylene pipes or socket fittings of different types and different melt flow rates. The welding butt joint of PE pipes is a process widely used in the installation and connection of engineering pipelines such as urban water supply, natural gas and coal gas transmission, food and chemical industry, ore sand and slurry transportation, landscaping, power wire threading, and sewage treatment. The three-section welding PE pipe process uses the principle that the voltage is more stable and the reliability is better, so that each of the three sections of voltage maintains a constant voltage. According to the formula Q = U²t / R, as time prolongs, the resistance increases, and in the early stage of welding, the heat rises quickly per unit time, making it easier to meet the melting temperature of the fitting and the pipe.

[0003] The welding butt joint of PE pipes is carried out by manual visual inspection or by using a steel plate for sizing, but the relative position between PE pipes is not easy to control, and it is difficult to ensure that the longitudinal centerlines of the two PE pipes always remain on the same straight line. There are often misalignment defects caused by human control errors during the welding process, and the welding quality cannot be guaranteed. Moreover, this operation method also has safety risks. During welding, it is necessary to always keep the relative position of the PE pipes unchanged, which is easy to scald the construction workers. Chinese patent document CN217373517U discloses a PE pipe welding butt joint device. By pushing and pulling the operating rod back and forth, the movable sleeve can move horizontally and linearly along the channel steel base, so that the longitudinal centerlines of the two PE pipes always remain on the same straight line during the welding butt joint of the PE pipes.

[0004] The above-mentioned three-section welding technology and the above-mentioned patented technology can ensure the coaxial welding of PE pipes. However, during the electrofusion welding, heat fusion and cooling process of the three-section PE pipes, due to the long length of the PE pipes, their butt joints and the PE pipes and electrofusion pipe hoops are in a suspended state in the trench, and the trench base cannot tightly support the fittings. The environment during the construction process of PE pipes is very harsh, and the fittings or the fittings and the pipe network will be affected by any external forces, such as: knocking, pulling, stepping, sitting, etc. During the electrofusion welding and cooling process of the electrothermal fittings, due to these external environmental influences, the PE pipes and the electrofusion pipe hoops are separated due to vibration, resulting in weld cracks, non-tight welds, and poor weld firmness and integrity.

[0005] In view of this, a patent application for this utility model is hereby filed. Contents of the Utility Model

[0006] The utility model provides a PE pipe structure with three-stage welding to solve the problems in the prior art that due to the butt joint and the fact that the PE pipe and the electrofusion pipe fitting are in a suspended state in the trench, affected by external vibration, they may separate during the fusion and cooling process of the electrothermal pipe fitting, resulting in weld cracks, loose welds, and poor weld firmness and integrity.

[0007] To solve the above problems, the utility model provides a PE pipe structure with three-stage welding. The PE pipe structure with three-stage welding includes two butt-jointed PE pipes 1 arranged in a construction trench 7 and an electrofusion pipe fitting 2 connecting the PE pipes 1. The butt joints of the two PE pipes 1 are respectively arranged at the two ends of the electrofusion pipe fitting 2; it also includes a clamping mechanism for fixing the PE pipe 1 and the electrofusion pipe fitting 2 on the same axis. The clamping mechanism includes a support 3, a pipe fitting clamp ring 4, and a PE pipe clamp ring 5.

[0008] The upper surface of the support 3 is a flat surface, and this flat surface has a pipe fitting groove 34 for accommodating the electrofusion pipe fitting 2. Both ends of the pipe fitting groove 34 have PE pipe grooves 33 for accommodating the joints of the two PE pipes 1. The PE pipe grooves 33 and the pipe fitting groove 34 are both semi-cylindrical structures, and the PE pipe grooves 33 and the pipe fitting groove 34 are coaxial; the electrofusion pipe fitting 2 and the PE pipe 1 are arranged in the pipe fitting groove 34 and the PE pipe grooves 33; the lower surface of the support 3 is an arc surface 31, and the arc surface 31 forms an eccentric structure with the center of the PE pipe groove 33.

[0009] The pipe fitting clamp ring 4 and the PE pipe clamp ring 5 arranged above the PE pipe 1 and the electrofusion pipe fitting 2 fix the PE pipe 1 and the electrofusion pipe fitting 2 in the grooves of the support 3.

[0010] Furthermore, the PE pipe structure with three-stage welding of the utility model also has the following characteristics: multiple layers of rubber pads 6 are respectively arranged on the inner arc surfaces of the pipe fitting clamp ring 4 and the PE pipe clamp ring 5 and the cylindrical surfaces of the PE pipe grooves 33 and the pipe fitting groove 34.

[0011] Furthermore, the three-stage welded PE pipe structure of the present utility model also has the following characteristics: at the positions on the upper plane edge of the support 3 corresponding to the pipe coupling groove 34 and the PE pipe groove 33 respectively, there are support bushings 32; the PE pipe clamp ring 5 and the pipe coupling clamp ring 4 above the PE pipe groove 33 and the pipe coupling groove 34 are both semi-circular structures, and the PE pipe clamp ring 5 and the pipe coupling clamp ring 4 are respectively clamped above the electrofusion pipe coupling 2 and the PE pipe 1 arranged in the pipe coupling groove 34 and the PE pipe groove 33; one end of the pipe coupling clamp ring 4 and the PE pipe clamp ring 5 has a pipe coupling clamp ring bushing 41 and a PE pipe clamp ring bushing 51, and the pipe coupling clamp ring bushing 41 and the PE pipe clamp ring bushing 51 are respectively in contact with the support bushing 32, and a hinge shaft is installed on the two mutually contacting bushings, and the axis of the hinge shaft is parallel to the axes of the PE pipe groove 33 and the pipe coupling groove 34; the other end of the pipe coupling clamp ring 4 and the PE pipe clamp ring 5 has an end plate in contact with the upper plane of the support 3, and the stud on this end plate is fixed in the screw hole on the upper plane of the support 3.

[0012] Technical effects of the present utility model:

[0013] Through the clamping mechanism, the PE pipe and the electrofusion pipe coupling are firmly fixed to form an integral structure before welding. Therefore, during the welding and cooling processes, the PE pipe and the electrofusion pipe coupling will not separate. The weld of the welding is dense and crack-free, the weld is tight and strong, without cracks or bubbles, and the welding firmness and integrity are good, ensuring the welding quality.

[0014] The support of the cam structure of the clamping mechanism will support under the welded part. This cam structure is like a wedge padding in the gap between the welded pipe fitting and the trench foundation and realizes the wedging effect. Furthermore, the welded part is stably and firmly supported in the trench, the pipe fittings and the pipe network structure are stable, the vibration is reduced, and the welding quality is ensured.

[0015] Due to the support by the support with the cam structure, the support height of the arc surface of the support padding under the welded part gradually increases, making the originally suspended welded part reach the most suitable support. Furthermore, during the welding process, the pipe fitting structure is stable, reducing the influence of vibration on the welding.

[0016] The overall structure is convenient for installation and disassembly, saving working hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the top view of the PE pipe, the electrofusion pipe coupling and the clamping mechanism of the present utility model;

[0018] Figure 2 is Figure 1 the A-A cross-sectional view of

[0019] Figure 3 is the structural schematic diagram of the PE pipe clamp ring;

[0020] Figure 4 is the three-dimensional view of the support;

[0021] Figure 5 Schematic diagram of a PE pipe and an electrofusion pipe fitting

[0022] Figure 6 Schematic diagram of a PE pipe in a trench

[0023] Figure 7 Schematic diagram of a support pad inserted under the PE pipe

[0024] Figure 8 Schematic diagram of a support firmly supporting under the PE pipe

[0025] Figure 9 Schematic diagram of the clamping mechanism installed

[0026] Symbol description in the figure: PE pipe 1, electrofusion pipe fitting 2, support 3, arc surface 31, support bushing 32, PE pipe groove 33, pipe fitting groove 34, pipe fitting clamping ring 4, pipe fitting clamping ring bushing 41, PE pipe clamping ring 5, PE pipe clamping ring bushing 51, rubber gasket 6, trench 7 Detailed implementation mode

[0027] The following uses the best embodiments to describe the present invention in detail

[0028] As Figure 1 、 2 、3, 4, 5 show, the PE pipe structure welded in three sections includes two butt-jointed PE pipes 1 arranged in a construction trench 7 and an electrofusion pipe fitting 2 connecting the PE pipes 1. The electrofusion pipe fitting refers to a plastic (polyethylene) pipe fitting that is melted by the temperature generated by an electric current to achieve connection. The butting interfaces of the two PE pipes 1 are respectively arranged at both ends of the electrofusion pipe fitting 2; it also includes a clamping mechanism for fixing the PE pipes 1 and the electrofusion pipe fitting 2 on the same axis. The clamping mechanism includes a support 3 and a pipe fitting clamping ring 4

[0029] The upper surface of the support 3 is a flat surface, which has a pipe fitting groove 34 for accommodating the electrofusion pipe fitting 2. Both ends of the pipe fitting groove 34 have PE pipe grooves 33 for accommodating the joints of the two PE pipes 1. The PE pipe grooves 33 and the pipe fitting grooves 34 are both semi-cylindrical structures, and the PE pipe grooves 33 and the pipe fitting grooves 34 are coaxial; at the positions corresponding to the pipe fitting groove 34 and the PE pipe groove 33 respectively on the edge of the upper plane of the support 3, there are support bushings 32

[0030] The lower surface of the support 3 is an arc surface 31. The arc surface 31 forms an eccentric structure with the center of the PE pipe groove 33, and further forms a cam structure with the axis of the PE pipe groove 33. With the axis of the PE pipe groove 33 as the center of the circle, the radius of the surface of the arc surface 31 is the largest on one side of the support bushing 32 and gradually decreases towards the other side

[0031] Above the PE pipe groove 33 and the pipe coupling groove 34, there are respectively arranged a PE pipe clamp ring 5 and a pipe coupling clamp ring 4. Both the PE pipe clamp ring 5 and the pipe coupling clamp ring 4 are semi-circular structures. The PE pipe clamp ring 5 and the pipe coupling clamp ring 4 are respectively clamped above the electrofusion pipe coupling 2 and the PE pipe 1 arranged in the pipe coupling groove 34 and the PE pipe groove 33. One end of the pipe coupling clamp ring 4 and the PE pipe clamp ring 5 has a pipe coupling clamp ring shaft sleeve 41 and a PE pipe clamp ring shaft sleeve 51. The pipe coupling clamp ring shaft sleeve 41 and the PE pipe clamp ring shaft sleeve 51 are respectively in fit with the support shaft sleeve 32, and a hinge shaft is installed on the two mutually-fitted shaft sleeves. The axis of the hinge shaft is parallel to the axes of the PE pipe groove 33 and the pipe coupling groove 34. The other end of the pipe coupling clamp ring 4 and the PE pipe clamp ring 5 has an end plate in fit with the upper plane of the support 3, and the stud on this end plate is fixed in the screw hole on the upper plane of the support 3, thereby fixing the PE pipe 1 and the electrofusion pipe coupling 2 in the groove of the support 3.

[0032] On the inner arc surfaces of the pipe coupling clamp ring 4 and the PE pipe clamp ring 5 and on the cylindrical surfaces of the PE pipe groove 33 and the pipe coupling groove 34, there are respectively arranged multiple layers of rubber pads 6.

[0033] As Figure 6 、 7 、8, 9 show, the usage method: 1. Select the number of layers of the rubber pad 6 according to the radii of the PE pipe 1 and the electrofusion pipe coupling 2, so that the inner arcs of the PE pipe groove 33, the PE pipe clamp ring 5, the pipe coupling groove 34, and the PE pipe clamp ring 5 are in conformity with the outer diameters of the PE pipe 1 and the electrofusion pipe coupling 2, thereby being able to firmly fix the PE pipe 1 and the electrofusion pipe coupling 2 therein.

[0034] 2. Install the clamping mechanism. Before welding, insert the butt ends of the two PE pipes 1 located in the trench 7 into both ends of the electrofusion pipe coupling 2. The end with the minimum radius of the cam-shaped arc surface 31 of the support 3 is placed under the PE pipe 1 and the electrofusion pipe coupling 2, and the PE pipe 1 and the electrofusion pipe coupling 2 are respectively arranged in the PE pipe groove 33 and the pipe coupling groove 34 on the upper plane of the support 3. At the same time, rotate the PE pipe groove 33 to support the support 3 with the cam surface to the maximum extent under the PE pipe 1 and the electrofusion pipe coupling 2 to form a tight support with the base layer of the trench 7.

[0035] 3. Fix the pipe coupling clamp ring 4 and the PE pipe clamp ring 5 on the PE pipe 1 and the electrofusion pipe coupling 2, thereby fixing the PE pipe 1 and the electrofusion pipe coupling 2 into an integral structure. During the welding process, even if there is external vibration, the PE pipe 1 and the electrofusion pipe coupling 2 will not separate, thereby ensuring the welding quality.

[0036] 4. Conduct electrofusion welding and cooling of the PE pipe. After the electrofusion welding of the PE pipe is completed, remove the clamping mechanism.

[0037] Operation key points: Place the two PE pipes on the clamping mechanism, make the central axes of the two pipes basically on the same horizontal line, and clamp and fix them to make the two welded pipes completely aligned, and minimize the misalignment as much as possible. In this way, the welding quality can be improved, and the problems of insecure joint welding and poor airtightness can be prevented.

[0038] This technology utilizes the principle that the voltage is more stable and the reliability is better, enabling each of the three sections of voltage to maintain a constant voltage. According to the formula Q = U²t / R, as time prolongs, the resistance increases, and the heat per unit time increases rapidly in the early stage of welding, making it easier to meet the temperature for the fusion of pipe fittings and pipes.

[0039] Use a fully automatic electrofusion welder to adjust the voltage for each section during welding. Keep each section of voltage unchanged and weld the pipe and the pipe fitting. During the welding process, observe the changes in the observation holes of each electrofusion joint, any abnormal sounds, joint deformation, surface temperature, and the welding parameters of each section of the welder. If there is no abnormality, when the third section is completed, the welding is finished and a good joint is obtained.

[0040] This technology solves the problems of low connection efficiency, poor quality, and difficulty in control of PE pipes. While improving the welding quality, it also speeds up the construction speed, reduces material losses, and the input of machinery and personnel, which is of great significance for reducing project costs and shortening the construction period.

[0041] This technology has been successfully tested in projects such as water supply projects, intake pump stations, pipeline parts, and pipeline well parts and other ancillary projects, achieving remarkable economic and social benefits.

[0042] This technology is a low-consumption, environmentally friendly, economical and practical green process, ensuring the connection quality of PE pipes with a diameter of not less than 63mm, bringing good economic and social benefits to the enterprise.

Claims

1. The structure of a three-section welded PE pipe, comprising two butt-jointed PE pipes (1) arranged in a construction trench (7) and an electrofusion pipe fitting (2) connecting the PE pipes (1), the butt joints of the two PE pipes (1) being respectively arranged at the two ends of the electrofusion pipe fitting (2); characterized in that, It further includes a clamping mechanism for fixing the PE pipe (1) and the electrofusion pipe fitting (2) on the same axis. The clamping mechanism includes a support (3), a pipe fitting snap ring (4) and a PE pipe snap ring (5); The upper surface of the support (3) is a plane which has a pipe fitting groove (34) for accommodating the electrofusion pipe fitting (2). At both ends of the pipe fitting groove (34), there are PE pipe grooves (33) for accommodating the joints of two PE pipes (1). Both the PE pipe grooves (33) and the pipe fitting groove (34) are semi-cylindrical structures, and the PE pipe grooves (33) and the pipe fitting groove (34) are coaxial. The electrofusion pipe fitting (2) and the PE pipe (1) are arranged in the pipe fitting groove (34) and the PE pipe grooves (33). The lower surface of the support (3) is an arc surface (31), and the arc surface (31) forms an eccentric structure with the center of the PE pipe groove (33); The pipe fitting snap ring (4) and the PE pipe snap ring (5) arranged above the PE pipe (1) and the electrofusion pipe fitting (2) fix the PE pipe (1) and the electrofusion pipe fitting (2) in the grooves of the support (3).

2. The structure of the PE pipe with three-stage welding as described in claim 1, characterized in that, On the inner arc surfaces of the pipe fitting snap ring (4) and the PE pipe snap ring (5) and on the cylindrical surfaces of the PE pipe grooves (33) and the pipe fitting groove (34), multiple layers of rubber pads (6) are respectively arranged.

3. The PE pipe structure welded in three sections as described in claim 1 is characterized in that, At the positions on the edge of the upper plane of the support (3) corresponding to the pipe fitting groove (34) and the PE pipe grooves (33) respectively, there are support bushings (32). The PE pipe snap ring (5) and the pipe fitting snap ring (4) above the PE pipe grooves (33) and the pipe fitting groove (34) are both semi-circular structures. The PE pipe snap ring (5) and the pipe fitting snap ring (4) are respectively clamped above the electrofusion pipe fitting (2) and the PE pipe (1) arranged in the pipe fitting groove (34) and the PE pipe grooves (33). One end of the pipe fitting snap ring (4) and the PE pipe snap ring (5) has a pipe fitting snap ring bushing (41) and a PE pipe snap ring bushing (51). The pipe fitting snap ring bushing (41) and the PE pipe snap ring bushing (51) are respectively in contact with the support bushings (32). An articulated shaft is installed on the two mutually contacting bushings, and the axis of the articulated shaft is parallel to the axes of the PE pipe grooves (33) and the pipe fitting groove (34). The other end of the pipe fitting snap ring (4) and the PE pipe snap ring (5) has an end plate in contact with the upper plane of the support (3), and the studs on the end plate are fixed in the screw holes on the upper plane of the support (3).

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