Internal connection electric melting pipe joint and composite pipe

Abstract

The internal connection electric melting pipe joint comprises an inner socket pipe section, an outer sealing pipe section and a butt joint pipe section, the inner socket pipe section is used for being inserted into a pipeline, and an electric melting area used for being attached to the inner wall of the pipeline is arranged on the outer wall of the inner socket pipe section; the outer sealing pipe section is connected to one end of the inner socket pipe section, the outer diameter of the outer sealing pipe section is larger than that of the inner socket pipe section, and the outer sealing pipe section is used for being attached to the end of a pipeline; the butt joint pipe section is connected to the other end of the outer sealing pipe section, the outer diameter of the butt joint pipe section is smaller than that of the outer sealing pipe section, and the butt joint pipe section is used for being inserted into a joint of another pipeline.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline connection, and in particular to an internally connected electric fusion pipe joint and a composite pipe. Background Art

[0002] Water seepage at the end of composite pipes is an industry pain point. Adding a sealing process to the composite pipe ports is a conventional solution. Nowadays, a solution with better sealing effect is to use special pipe edge sealing equipment for edge sealing. However, for on-site pipe breakage, emergency repairs and other working conditions, the existing composite pipe port seals are not easy to install, resulting in low operating efficiency and poor sealing effect. It is difficult to adapt to the requirements of fast and convenient sealing for on-site pipe breakage, emergency repairs and other working conditions. Utility Model Content

[0003] The main purpose of the present application is to provide an internally connected electric fusion pipe joint and a composite pipe, aiming to solve the technical problems of poor sealing and installation convenience and low operating efficiency of existing composite pipeline ports.

[0004] To achieve the above-mentioned purpose, the present application provides an internally connected electric fusion pipe joint, comprising an inner bell-and-spigot pipe section, an outer sealed pipe section and a butt-jointed pipe section, wherein the inner bell-and-spigot pipe section is used to be inserted into the interior of a pipe, and an outer wall of the inner bell-and-spigot pipe section is provided with an electric fusion zone for fitting the inner wall of the pipe; the outer sealed pipe section is connected to one end of the inner bell-and-spigot pipe section, the outer diameter of the outer sealed pipe section is greater than the outer diameter of the inner bell-and-spigot pipe section, and the outer sealed pipe section is used to fit the end of the pipe; the butt-jointed pipe section is connected to the other end of the outer sealed pipe section, the outer diameter of the butt-jointed pipe section is less than the outer diameter of the outer sealed pipe section, and the butt-jointed pipe section is used to be inserted into the joint of another pipe.

[0005] Optionally, the butt joint pipe section includes a positioning fitting section and a bevel guide section, the positioning fitting section is connected to the end of the outer sealing pipe section; the bevel guide section is connected to the other end of the positioning fitting section, and the outer diameter of the bevel guide section gradually decreases in the direction away from the positioning fitting section.

[0006] Optionally, the outer wall of the inclined guide section is provided with at least one circle of sealing groove, and a sealing rubber ring is arranged in the sealing groove.

[0007] Optionally, an inner chamfer is formed on an inner wall of an end portion of the inner bell-and-spigot pipe section away from the outer sealing pipe section.

[0008] Optionally, assuming that the length of the inner bell-and-spigot pipe section is L1, the length of the outer sealing pipe section is L2, and the length of the fusion zone is L3, then L1, L2 and L3 meet the following conditions:

[0009] L1≥L3+5mm;

[0010] L3 ≥ 10 mm;

[0011] L2≥5mm.

[0012] Optionally, the outer diameter of the outer sealing pipe section is equal to the outer diameter of the pipeline.

[0013] Optionally, a heating wire is buried in the electric fusion zone.

[0014] The present application also provides a composite pipe, comprising the above-mentioned internal connection electric fusion pipe joint.

[0015] Optionally, a connecting pipe is further included, wherein the connecting pipe is sleeved on the inner bell-and-spigot pipe section, and the end of the connecting pipe is in contact with the side end of the outer sealing pipe section.

[0016] Optionally, the connecting pipe includes an inner plastic layer, a reinforcement skeleton layer and an outer plastic layer which are sequentially connected from inside to outside.

[0017] The beneficial effects that this application can achieve are as follows:

[0018] The present application includes an inner bell-and-spigot pipe section, an outer sealed pipe section and a butt-joint pipe section. The inner bell-and-spigot pipe section is used to be inserted into the interior of a pipeline, and an outer wall of the inner bell-and-spigot pipe section is provided with an electric fusion zone for fitting the inner wall of the pipeline; the outer sealed pipe section is connected to one end of the inner bell-and-spigot pipe section, the outer diameter of the outer sealed pipe section is larger than the outer diameter of the inner bell-and-spigot pipe section, and the outer sealed pipe section is used to fit the end of the pipeline; the butt-joint pipe section is connected to the other end of the outer sealed pipe section, the outer diameter of the butt-joint pipe section is smaller than the outer diameter of the outer sealed pipe section, and the butt-joint pipe section is used to be inserted into the interior of another pipeline. Based on the structure of the present application, when two pipes need to be sealed and connected, the inner bell-and-spigot pipe section is first inserted into one of the pipes. The electric fusion zone on the inner bell-and-spigot pipe section can be directly welded and fixed on the inner wall of the pipe by electric fusion welding. At this time, the outer sealing pipe section fits the end of the pipe. After welding and fixing, the outer sealing pipe section can seal the end of the pipe, and there is no need to perform the sealing operation separately, thereby improving the convenience of sealing installation and improving operating efficiency. The other pipe can be quickly docked through the docking pipe section, which improves the installation efficiency. The inner bell-and-spigot electric fusion method adopted in the present application can effectively prevent the internal fluid from penetrating into the pipe port, thereby ensuring the sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0020] Figure 1 This is a schematic structural diagram of an internally connected electric fusion pipe joint in an embodiment of the present application;

[0021] Figure 2 This is a schematic structural diagram of a composite tube in an embodiment of the present application;

[0022] Figure 3This is a schematic diagram of the structure of the connecting pipe in the embodiment of the present application;

[0023] Figure 4 It is a schematic structural diagram of a composite pipe when an outer jacket electric fusion pipe fitting is sleeved on the composite pipe in an embodiment of the present application.

[0024] Reference numerals:

[0025] 100-internal connecting electric fusion pipe joint, 110-internal bell-and-spigot pipe section, 111-electric fusion zone, 112-inner chamfer, 120-external sealing pipe section, 130-butt pipe section, 131-positioning matching section, 132-bevel guide section, 140-sealing rubber ring, 200-connecting pipe, 210-inner plastic layer, 220-reinforced skeleton layer, 230-outer plastic layer.

[0026] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; 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 connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0031] Example 1

[0032] Reference Figure 1 The present embodiment provides an internal connection electric fusion pipe joint 100, including an inner bell-and-spigot pipe section 110, an outer sealed pipe section 120 and a butt-joint pipe section 130. The inner bell-and-spigot pipe section 110 is used to be inserted into the interior of a pipeline, and an outer wall of the inner bell-and-spigot pipe section 110 is provided with an electric fusion zone 111 for fitting the inner wall of the pipeline; the outer sealed pipe section 120 is connected to one end of the inner bell-and-spigot pipe section 110, and the outer diameter of the outer sealed pipe section 120 is greater than the outer diameter of the inner bell-and-spigot pipe section 110, and the outer sealed pipe section 120 is used to fit the end of the pipeline; the butt-joint pipe section 130 is connected to the other end of the outer sealed pipe section 120, and the outer diameter of the butt-joint pipe section 130 is less than the outer diameter of the outer sealed pipe section 120, and the butt-joint pipe section 130 is used to be inserted into the joint of another pipeline.

[0033] In this embodiment, when it is necessary to seal and connect two pipes, the inner bell-and-spigot pipe section 110 is first inserted into one of the pipes, and the electric fusion zone 111 on the inner bell-and-spigot pipe section 110 can be directly welded and fixed on the inner wall of the pipe by electric fusion welding. At this time, the outer sealing pipe section 120 fits the end of the pipe. After welding and fixing, the outer sealing pipe section 120 can seal the end of the pipe, and there is no need to perform the sealing operation separately, thereby improving the convenience of sealing installation and improving the operating efficiency. The other pipe (mainly referring to the outer jacket electric fusion pipe fitting) can be quickly docked through the docking pipe section 130, which improves the installation efficiency. In addition, the inner bell-and-spigot electric fusion method adopted in this embodiment can effectively prevent the internal fluid from penetrating into the pipe port, thereby ensuring the sealing performance, and can meet the requirements of fast and convenient sealing in conditions such as on-site pipe breakage and emergency repairs.

[0034] It should be noted that the outer diameter dn1 of the inner socket pipe section here matches the inner diameter of the corresponding matching pipe to ensure the product installation and welding effect; when another pipe is connected through the butt pipe section 130, the internal fluid can flow normally at this time, and there is no need to rush. At this time, the electric fusion pipe fittings can be installed at the joint between the butt pipe section 130 and the pipeline for fixing.

[0035] As an optional embodiment, the docking tube section 130 includes a positioning fitting section 131 and a bevel guide section 132, the positioning fitting section 131 is connected to the end of the outer sealing tube section 120; the bevel guide section 132 is connected to the other end of the positioning fitting section 131, and the outer diameter of the bevel guide section 132 gradually decreases in the direction away from the positioning fitting section 131.

[0036] In this embodiment, when the butt-jointed pipe section 130 and the pipeline are butt-jointed and installed, the butt-jointed pipe section 130 can be quickly inserted into the pipeline through the inclined guide section 132, thereby improving the convenience of installation and thus improving efficiency. After being fully inserted, the positioning matching section 131 fits against the inner wall of the pipeline to facilitate matching connection with the pipeline.

[0037] As an optional implementation, at least one sealing groove is formed on the outer wall of the inclined guide section 132, and a sealing rubber ring 140 is arranged in the sealing groove, which can improve the sealing performance between the butt joint section 130 and the pipeline after docking and prevent fluid leakage after docking.

[0038] As an optional implementation, an inner chamfer 112 is provided on the inner wall of the end of the inner bell-and-spigot pipe section 110 away from the outer sealing pipe section 120, which can effectively reduce the fluid pressure loss inside the pipeline and optimize the water supply condition of the inner wall.

[0039] As an optional embodiment, assuming that the length of the inner bell-and-spigot pipe section 110 is L1, the length of the outer sealing pipe section 120 is L2, and the length of the fusion zone 111 is L3, then L1, L2 and L3 meet the following conditions:

[0040] L1≥L3+5mm;

[0041] L3 ≥ 10 mm;

[0042] L2≥5mm.

[0043] In this embodiment, in order to ensure the reliability of electric fusion welding, the electric fusion zone 111 should have a certain length, otherwise it is easy to cause the welding to be unreliable and detached. According to experimental tests, the length L3 ≥ 10 mm of the electric fusion zone 111 can meet the above requirements, and the length of the inner socket pipe section 110 should be greater than the length of the electric fusion zone 111, generally greater than 5 mm or more, so as to retain the hot melt section sealing area; and the length L2 of the outer sealing pipe section 120 should not be too short. According to experimental tests, setting L2 ≥ 5 mm here can meet the welding sealing requirements.

[0044] As an optional embodiment, the outer diameter dn2 of the outer sealing pipe section 120 is equal to the outer diameter of the pipeline. After installation, the outer sealing pipe section 120 and the pipeline form a smooth integrated structure without protruding parts, thereby maintaining the original size of the pipeline and preventing interference with subsequent pipeline installation.

[0045] As an optional implementation, a heating wire is buried in the electric fusion zone 111. By heating the heating wire, the electric fusion zone 111 can be hot-melt welded to the inner wall of the pipe to achieve internal welding, and the pipe structure is firm and stable after welding.

[0046] Example 2

[0047] Reference Figure 1-Figure 4 This embodiment also provides a composite pipe, including the above-mentioned inner connection electric fusion pipe joint 100. It also includes a connecting pipe 200, which is sleeved on the inner bell-and-spigot pipe section 110, and the end of the connecting pipe 200 is in contact with the side end of the outer sealing pipe section 120. After the composite pipe adopts the inner connection electric fusion pipe joint 100, it can be quickly sealed and installed, and the sealing performance is guaranteed.

[0048] As an optional embodiment, the connecting pipe 200 includes an inner plastic layer 210, a reinforcement skeleton layer 220 and an outer plastic layer 230 which are sequentially connected from the inside to the outside, and has high structural strength.

[0049] Based on the structure of the above-mentioned internal connection electric fusion pipe joint 100, its manufacturing method is as follows: first prepare a semi-finished pipe joint, the manufacturing method of the semi-finished pipe joint includes but is not limited to mold opening injection molding, thick-walled pipe turning molding, etc., the blank outer diameter of the inner bell-and-spigot pipe section 110 in the semi-finished product is dn3, wherein dn3>dn1; then perform wire-laying processing, fix the semi-finished pipe joint on a wire-laying lathe, now turn the outer diameter dn3 of the inner bell-and-spigot pipe section 110 to dn1, and then bury the heating wire, the heating wire burying interval is designed to be L3, generally speaking, L1≥L3+5mm, and the hot melt section sealing area is retained; in particular, a sealing rubber ring 140 can be put on before and after the wire-laying processing, or a rubber ring-free design can be adopted.

[0050] Based on the structure of the above-mentioned internal connection electric fusion pipe joint 100, its installation method is as follows: first, the port of the composite pipe to be connected (i.e., the connecting pipe 200) is polished and smoothed; the oxide layer of the inner plastic layer 210 of the inner diameter of the port is polished, and the polishing depth is L4, L4>L3, and the inner bell-and-spigot pipe section 110 is installed on the inner wall of the connecting pipe 200, and the welding parameters are set by electric fusion welding. After the welding is completed, the end of the connecting pipe 200 is sealed and connected with the internal connection electric fusion pipe joint 100, and then the butt pipe section 130 is connected. It is quickly connected with the outer jacket electric fusion pipe fitting (the inner wall of the outer jacket electric fusion pipe fitting is provided with a limiting step for positioning the outer sealing pipe section 120), so that the outer electric fusion zone of the outer jacket electric fusion pipe fitting is at the docking position of the inner connecting electric fusion pipe joint 100 and the connecting pipe 200, and then electric fusion welding and sealing are performed from the outside. Here, the outer jacket electric fusion pipe fitting can be a straight pipe or a curved pipe, and the other end of the outer jacket electric fusion pipe can be connected to a composite pipe (that is, a pre-assembled structure of the inner connecting electric fusion pipe joint 100 and the connecting pipe 200 with the same structure), thereby forming a complete pipeline.

[0051] It should be noted that if Figure 4 As shown, the length L2 of the outer sealing pipe section 120 needs to meet the application pipeline connection, and the length of the outer electric fusion zone corresponding to the matching electric fusion pipe fitting must include a section of L2 length, and a sealing area is reserved. If L2 is too short, when the outer outer fusion pipe fitting is welded, L2 will not be in the melting zone of the outer outer fusion pipe fitting, resulting in welding failure and internal fluid infiltration. At the same time, it is necessary to ensure that L2>L5, and L5 is the length of the sealing cooling zone at the bottom of the socket of the outer outer fusion pipe fitting.

[0052] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An internal connection electric fusion pipe joint, characterized in that: include: An inner bell-and-spigot pipe section, the inner bell-and-spigot pipe section is used to be inserted into the interior of the pipeline, and an outer wall of the inner bell-and-spigot pipe section is provided with an electric fusion zone for fitting against the inner wall of the pipeline; An outer sealed pipe section, the outer sealed pipe section is connected to one end of the inner bell-and-spigot pipe section, the outer diameter of the outer sealed pipe section is greater than the outer diameter of the inner bell-and-spigot pipe section, and the outer sealed pipe section is used to fit the end of the pipeline; A butt-joint pipe section is connected to the other end of the outer sealed pipe section, the outer diameter of the butt-joint pipe section is smaller than the outer diameter of the outer sealed pipe section, and the butt-joint pipe section is used to be inserted into the joint of another pipeline.

2. An internal connection electric fusion pipe joint as claimed in claim 1, characterized in that: The butt-jointed pipe section comprises: A positioning and fitting section, the positioning and fitting section being connected to an end portion of the outer sealing tube section; The bevel guide section is connected to the other end of the positioning and fitting section, and the outer diameter of the bevel guide section gradually decreases in a direction away from the positioning and fitting section.

3. An internal connection electric fusion pipe joint as claimed in claim 2, characterized in that: The outer wall of the inclined guide section is provided with at least one circle of sealing groove, and a sealing rubber ring is arranged in the sealing groove.

4. An internal connection electric fusion pipe joint as claimed in claim 1, characterized in that: An inner chamfer is formed on the inner wall of the end of the inner bell-and-spigot pipe section away from the outer sealing pipe section.

5. An internal connection electric fusion pipe joint as claimed in claim 1, characterized in that: Assuming that the length of the inner bell-and-spigot pipe section is L1, the length of the outer sealing pipe section is L2, and the length of the electric fusion zone is L3, then L1, L2 and L3 meet the following conditions: L1≥L3+5mm; L3≥10mm; L2≥5mm.

6. An internal connection electric fusion pipe joint as claimed in claim 1 or 5, characterized in that: The outer diameter of the outer sealing pipe section is equal to the outer diameter of the pipeline.

7. An internal connection electric fusion pipe joint as claimed in claim 1 or 5, characterized in that: The electric melting zone is buried with a heating wire.

8. A composite pipe, characterized in that: It comprises an inner connection electric fusion pipe joint as claimed in any one of claims 1 to 7.

9. A composite pipe according to claim 8, characterized in that: It also includes a connecting pipe, which is sleeved on the inner bell-and-spigot pipe section, and the end of the connecting pipe is in contact with the side end of the outer sealing pipe section.

10. A composite pipe according to claim 9, characterized in that: The connecting pipe comprises an inner plastic layer, a reinforcement skeleton layer and an outer plastic layer which are sequentially connected from the inside to the outside.

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