An electrofusion conversion reducer and pipe connection structure

Abstract

This application discloses an electrofusion conversion reducer and pipe connection structure, including an inner connector tube, an output tube at one end of the inner connector tube with a diameter smaller than that of the inner connector tube, a first resistance wire wound around the outer wall of the inner connector tube, an outer connector tube connected to the outer wall of the inner connector tube near the output tube, a second resistance wire wound around the inner wall of the outer connector tube, and an annular connection cavity formed between the outer connector tube and the inner connector tube for connection with a pipe, and a through-hole for the end of the first resistance wire to extend from the side end of the outer connector tube. This application has the advantage of improving the connection reliability of the reducer.

Description

Technical Field

[0001] This application relates to the field of electrofusion tube technology, and in particular to an electrofusion conversion reducer joint and tube connection structure. Background Technology

[0002] High-density polyethylene (PE) piping systems are widely used in fluid transportation fields such as municipal water supply and drainage, gas transmission, and mine tailings due to their excellent corrosion resistance, flexibility, and service life. Electrofusion fittings, especially large-diameter electrofusion tees, are key connecting components in piping systems used for diversion and bypass.

[0003] In practical engineering, it is often necessary to connect a small-diameter branch pipe from the large-diameter tee bypass port of the main pipeline. Generally, a reducer can be used to connect the bypass pipe of the main pipeline to the small-diameter branch pipe. However, the welding surface of the reducer and the bypass pipe is either on the inner wall or the outer wall of the pipe. Regardless of the connection structure, after a period of use, the reducer is prone to loosening due to internal fluid impact and corrosion and the influence of the external environment (such as corrosion and vibration), which eventually leads to fluid leakage. Therefore, the reliability of the connection structure between the reducer and the bypass pipe needs to be further improved. Utility Model Content

[0004] The main objective of this application is to provide an electrofusion conversion reducer and pipe connection structure, which aims to solve the technical problem of low connection reliability of existing reducers used for pipe connection.

[0005] To achieve the above objectives, this application provides an electrofusion conversion reducer, including an inner connector tube, an output tube at one end of the inner connector tube, the diameter of the output tube being smaller than the diameter of the inner connector tube, a first resistance wire wound around the outer wall of the inner connector tube, an outer connector tube connected to the outer wall of the inner connector tube near the output tube, a second resistance wire wound around the inner wall of the outer connector tube, and an annular mating cavity formed between the outer connector tube and the inner connector tube for mating with a pipe, and a port for the end of the first resistance wire to extend from the side end of the outer connector tube.

[0006] Optionally, the outer wall of the external connector tube is provided with a terminal block, which is electrically connected to the second resistance wire.

[0007] Optionally, a sealing plug may be detachably provided at the opening.

[0008] Optionally, the end of the inner connector tube away from the output tube is connected to multiple elastic clips with barbs, and the multiple elastic clips are distributed in a ring array.

[0009] Optionally, a flow divider is provided on the inner wall of the inner connector pipe for diverting fluid.

[0010] Optionally, the distributor includes a circular portion, the edge of which is connected to a plurality of distribution strips arranged in a ring array, and the other end of the distribution strips is connected to the inner wall of the inner connector pipe.

[0011] Optionally, the length direction of the splitter bar forms an angle with the axis of the inner connector pipe, so that the splitter as a whole has a conical structure, and the circular part is close to the output pipe.

[0012] Optionally, a reducing transition pipe is also connected between the inner connector pipe and the output pipe, with the diameter of the reducing transition pipe gradually decreasing towards the output pipe.

[0013] To achieve the above objectives, this application also provides a pipe connection structure, including a main pipe, at least one bypass pipe connected to the side wall of the main pipe, and the bypass pipe being connected to an electrofusion conversion reducer as described above.

[0014] Optionally, the inner wall of the bypass pipe is provided with a limiting step that contacts the end face of the inner connector pipe. The side wall of the limiting step is provided with multiple engaging grooves that cooperate with the corresponding elastic buckles. The engaging grooves are filled with adhesive.

[0015] The beneficial effects that this application can achieve are as follows: This application includes an inner connector tube, one end of which is provided with an output tube. The diameter of the output tube is smaller than that of the inner connector tube. A first resistance wire is wound around the outer wall of the inner connector tube. An outer connector tube is connected to the outer wall of the inner connector tube near the output tube. A second resistance wire is wound around the inner wall of the outer connector tube. The outer connector tube and the inner connector tube form an annular mating cavity for docking with a pipe. An opening is provided at the side end of the outer connector tube for the end of the first resistance wire to extend out. Based on the structure of this application, an annular connecting cavity is formed between the outer connector pipe and the inner connector pipe to connect with the branch pipe. After the connection is assembled, an electrofusion welding surface is formed between the first resistance wire on the outer wall of the inner connector pipe and the inner wall of the branch pipe. At the same time, an electrofusion welding surface is formed between the second resistance wire on the inner wall of the outer connector pipe and the outer wall of the branch pipe. This double-layer electrofusion welding surface improves the reliability of the connection with the branch pipe. Furthermore, due to the double-layer pipe structure formed by this application, the first resistance wire can be extended to connect to the electrofusion welding machine by opening a port at the side end of the outer connector pipe. The first resistance wire will not contact the side end of the outer connector pipe at the port, so that the first resistance wire only forms an electrofusion welding surface between the outer wall of the inner connector pipe and the inner wall of the branch pipe, thus ensuring the feasibility of the inner and outer welding surfaces. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of the structure of an electrofusion conversion reducer joint according to an embodiment of this application; Figure 2 for Figure 1 Structural diagram in right view (sealing plug omitted); Figure 3 This is a schematic diagram of another structure of an electrofusion conversion reducer according to an embodiment of this application; Figure 4 This is a cross-sectional view of a pipe connection structure in an embodiment of this application; Figure 5 for Figure 4 A magnified schematic diagram of the partial structure at point A in the middle; Figure 6 This is a three-dimensional structural diagram of a pipe connection structure in an embodiment of this application.

[0018] Figure label: 110-Inner connector tube, 111-Elastic snap fastener, 120-Output tube, 130-First resistance wire, 140-Outer connector tube, 141-Port, 150-Second resistance wire, 160-Annular mating cavity, 170-Terminal, 180-Sealing soft plug, 190-Shunting device, 191-Circular part, 192-Shunting strip, 210-Reducing diameter transition tube, 220-Main pipe, 230-Bypass pipe, 231-Clamping groove, 240-Adhesive.

[0019] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0022] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0024] Example 1 Reference Figures 1-3 This embodiment provides an electrofusion conversion reducer, including an inner connector tube 110. One end of the inner connector tube 110 is provided with an output tube 120, the diameter of which is smaller than that of the inner connector tube 110. A first resistance wire 130 is wound around the outer wall of the inner connector tube 110. An outer connector tube 140 is connected to the outer wall of the inner connector tube 110 near the output tube 120. A second resistance wire 150 is wound around the inner wall of the outer connector tube 140. An annular docking cavity 160 for docking with a pipe is formed between the outer connector tube 140 and the inner connector tube 110. A port 141 for the end of the first resistance wire 130 to extend is opened on the side end of the outer connector tube 140.

[0025] In this embodiment, the branch pipe is connected by forming an annular mating cavity 160 between the outer connector pipe 140 and the inner connector pipe 110. After the mating assembly, an electrofusion welding surface is formed between the first resistance wire 130 on the outer wall of the inner connector pipe 110 and the inner wall of the branch pipe. At the same time, an electrofusion welding surface is formed between the second resistance wire 150 on the inner wall of the outer connector pipe 140 and the outer wall of the branch pipe. This double-layer electrofusion welding surface improves the reliability of the connection with the branch pipe. Furthermore, due to the double-layer pipe structure formed in this embodiment, the first resistance wire 130 can be extended to connect to the electrofusion welding machine by opening a through-hole 141 at the side end of the outer connector pipe 140. The first resistance wire 130 will not contact the side end of the outer connector pipe 140 at the through-hole 141. This ensures that the first resistance wire 130 only forms an electrofusion welding surface between the outer wall of the inner connector pipe 110 and the inner wall of the branch pipe, thus guaranteeing the feasibility of the inner and outer welding surfaces.

[0026] It should be noted that after connecting the electrofusion conversion reducer in this embodiment to the branch pipe, the output pipe 120 can be used to connect to the target small-diameter branch pipe. The output pipe 120 can be an electrofusion socket with wire-lined outer wall, or it can be designed as a flange end or other interface form as needed. The electrofusion conversion reducer in this embodiment can be an integral injection-molded structure, facilitating mass production. After assembly, the first resistance wire 130 and the second resistance wire 150 can be heated by an electrofusion welding machine. The generated heat melts the polyethylene material on both sides of the fusion surface simultaneously, and after cooling, a strong and sealed integral structure is formed. During electrofusion welding, welding parameters can be set, such as using a three-stage gradient current. The first stage preheats the plastic in the fusion zone, the second stage reaches the maximum melting temperature peak, and the third stage slowly cools and solidifies to eliminate internal stress. After welding, a reliable sealed connection structure is formed.

[0027] As an optional implementation, the outer wall of the external connector tube 140 is provided with a terminal 170, which is electrically connected to the second resistance wire 150. This allows the terminal 170 to directly contact the electrodes of the electrofusion welding machine, thereby causing the second resistance wire 150 to heat up.

[0028] It should be noted that the end of the first resistance wire 130 extending out of the port 141 needs to be temporarily assembled with a terminal block to contact the electrode of the electrofusion welding machine. After the welding is completed, the end of the first resistance wire 130 can be cut off.

[0029] As an optional implementation, a sealing soft plug 180 is detachably provided at the port 141. After the fusion is completed, the sealing soft plug 180 can be pressed into the port 141 to prevent foreign objects from entering the port 141 and causing corrosion to the weld surface, thereby further improving the reliability of the pipe connection. At the same time, the sealing soft plug 180 can be partially melted and bonded to the port 141 by the preheating of the first resistance wire 130, which improves the fixation reliability of the sealing soft plug 180 in the port 141.

[0030] As an optional implementation, the end of the inner connector tube 110 away from the output tube 120 is connected to a plurality of elastic buckles 111 with barbs, and the plurality of elastic buckles 111 are distributed in a ring array.

[0031] In this embodiment, multiple engaging grooves that mate with the elastic buckle 111 can be opened in the branch pipe. During pre-assembly, the inner connector pipe 110 can be inserted into the branch pipe, and the elastic buckle 111 can be engaged in the corresponding engaging groove. This allows the branch pipe to exert a certain restraining force on the entire reducing joint, reducing the risk that the axis of the reducing joint and the axis of the branch pipe will not be parallel due to material shrinkage and deformation during the welding process.

[0032] As an optional implementation, a flow divider 190 is provided on the inner wall of the inner connector pipe 110. The flow divider 190 is used to divide the fluid, thereby reducing the erosive force of the fluid on the pipe.

[0033] As an optional implementation, the diverter 190 includes a circular portion 191, the edge of which is connected to a plurality of diverter strips 192 arranged in a ring array, and the other end of the diverter strips 192 is connected to the inner wall of the inner connector tube 110.

[0034] In this embodiment, when the fluid passes through the diverter 190, it is divided into multiple streams by the action of multiple diverter bars 192. The circular part 191 located at the center of the multiple diverter bars 192 plays the role of connecting and reinforcing the structure. The diverted fluid then converges and flows out in the output pipe 120, thereby reducing the erosion effect caused by the sudden change in pipe diameter from large to small, and improving the service life of the pipeline.

[0035] As an optional implementation, the length direction of the diverter 192 forms an angle with the axis of the inner connector pipe 110, so that the diverter 190 has an overall conical structure, and the circular part 191 is close to the output pipe 120. Based on the conical structure of the diverter 190, compared with the planar structure (i.e., the diverter 192 is perpendicular to the axis of the inner connector pipe 110), the diverter 190 can improve its resistance to fluid impact, thereby increasing its service life.

[0036] As an optional implementation, a variable diameter transition pipe 210 is also connected between the inner connector pipe 110 and the output pipe 120. The diameter of the variable diameter transition pipe 210 gradually decreases towards the output pipe 120. The variable diameter transition pipe 210 can further reduce fluid resistance, reduce turbulence and energy loss.

[0037] Example 2 Reference Figures 4-6 This embodiment also provides a pipe connection structure, including a main pipe 220, with at least one bypass pipe 230 (i.e., the aforementioned branch pipe) connected to the side wall of the main pipe 220. The bypass pipe 230 is connected to an electrofusion conversion reducer as described above. The inner wall of the bypass pipe 230 is provided with a limiting step that contacts the end face of the inner connector pipe 110. The side wall of the limiting step is provided with multiple engaging grooves 231 that mate with corresponding elastic buckles 111. The engaging grooves 231 are filled with adhesive 240. In this embodiment, during assembly, the locking groove 231 is pre-filled with adhesive 240. When the inner connector tube 110 is inserted into the bypass tube 230 and the limiting step is released, the corresponding elastic buckle 111 is engaged in the corresponding locking groove 231. Since the opening space of the locking groove 231 needs to be larger than the volume of the elastic buckle 111 to ensure the smooth insertion of the elastic buckle 111, the gap between the elastic buckle 111 and the locking groove 231 can be automatically filled after the adhesive 240 solidifies. This ensures that there is no gap inside the reducer and the bypass tube 230 after welding, thus ensuring the integrity of the pipe structure.

[0038] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An electrofusion transition reducing coupling, characterised in that, The device includes an inner connector tube, one end of which is provided with an output tube. The diameter of the output tube is smaller than that of the inner connector tube. A first resistance wire is wound around the outer wall of the inner connector tube. An outer connector tube is connected to the outer wall of the inner connector tube near the output tube. A second resistance wire is wound around the inner wall of the outer connector tube. The outer connector tube and the inner connector tube form an annular mating cavity for docking with a pipe. An opening is provided on the side end of the outer connector tube for the end of the first resistance wire to extend out.

2. An electrofusion transition coupling as claimed in claim 1, characterised in that, The outer wall of the external connector tube is provided with a terminal post, which is electrically connected to the second resistance wire.

3. An electrofusion transition coupling as claimed in claim 1, wherein, A detachable sealing plug is provided at the opening.

4. An electrofusion transition coupling as claimed in claim 1, wherein, The end of the inner connector tube away from the output tube is connected to multiple elastic buckles with barbs, and the multiple elastic buckles are distributed in a ring array.

5. An electrofusion transition coupling as claimed in claim 1, wherein, The inner wall of the inner connector pipe is provided with a flow divider, which is used to divide the fluid.

6. An electrofusion transition coupling as claimed in claim 5, wherein, The diverter includes a circular portion, the edge of which is connected to a plurality of diverting strips arranged in a ring array, and the other end of the diverting strips is connected to the inner wall of the inner connector pipe.

7. An electrofusion transition coupling as claimed in claim 6, wherein, The length direction of the splitter bar forms an angle with the axis of the inner connector tube, so that the splitter as a whole has a conical structure, and the circular part is close to the output tube.

8. An electrofusion conversion reducing coupling according to any one of claims 1 to 7, wherein, A variable diameter transition pipe is also connected between the inner connector pipe and the output pipe, and the diameter of the variable diameter transition pipe gradually decreases towards the output pipe.

9. A pipe butt joint structure characterized by It includes a main pipeline, the side wall of which is connected to at least one bypass pipe, and the bypass pipe is connected to an electrofusion conversion reducer as described in claim 4.

10. A pipe butt joint structure according to claim 9, wherein The inner wall of the bypass pipe is provided with a limiting step that contacts the end face of the inner connector pipe. The side wall of the limiting step is provided with a plurality of engaging grooves that cooperate with the corresponding elastic buckles. The engaging grooves are filled with adhesive.

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