Sealing pipe fitting with internal electric melting connection
By wrapping an electrofusion wire around the outer wall of the pipe fitting and using the positive and negative electrodes of the copper head to form a current loop, the problem of unstable connection of steel-plastic composite pipes in the prior art is solved, and an efficient and safe electrofusion connection effect is achieved.
Patent Information
- Application Number
- CN202520016214.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-01-06
AI Technical Summary
The existing electrofusion joint fittings have an unreasonable structural design, which causes the plastic to separate from the steel wire or steel plate when the steel-plastic composite pipe is used, resulting in water leakage and affecting the connection and sealing effect.
An electrofusion wire is wound around the outer wall of the pipe fitting, and an electrofusion connection is achieved through the positive and negative copper terminals at the pipe end, forming a stable current circuit and avoiding instability caused by the connection on the inner wall.
It improves the stability and sealing of pipe connections, prevents water leakage, and ensures standardized, efficient, fast, safe and reliable installation.
Smart Images
Figure CN223595300U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrofusion connection technology, specifically to a sealing pipe fitting with internal electrofusion connection. Background Technology
[0002] Electrofusion heating is a pipe fitting connection method that uses electric current to heat an embedded resistance wire (electrofusion wire) within the pipe fitting, melting the internal material and connecting it to another pipe fitting. After cooling, the melt solidifies. Electrofusion connections offer high connection strength and, due to the high quality and sealing of the electrofusion pipe fitting joints, greater reliability. However, existing electrofusion pipe fitting designs are flawed, resulting in poor performance. Specifically, in existing electrofusion pipe fittings, the electrofusion wire is installed on the inner wall of the fitting to connect to the outer wall of the electrofusion pipe. This connection method is prone to causing separation between the plastic and steel wire or plate when exposed to water in steel-plastic composite pipes. This can lead to water seepage into the composite layer of the pipe, severely affecting the connection and sealing effect of the electrofusion pipe fitting. Summary of the Invention
[0003] To address the shortcomings and deficiencies of existing steel-plastic composite pipes where the plastic separates from the steel wire or plate upon contact with water, this utility model provides a sealing pipe fitting with internal electrofusion connection that features a reasonable structural design, standardized and efficient installation, high speed, safety and reliability, and improved pipe connection stability.
[0004] This utility model achieves the above objectives by adopting the following technical solution:
[0005] An internal electrofusion-connected sealing pipe fitting includes a pipe body and a pipe head; the pipe body is distributed left and right and has a ring structure; an electrofusion wire is provided on the outer wall of the pipe body, the electrofusion wire is spirally wound and installed on the outer wall of the pipe body, and the electrofusion wire is kept flush with the outer wall of the pipe body; the pipe head is located at the right end of the pipe body and the two are integrally formed, and the pipe head is also provided with a through hole, the through hole being two symmetrically distributed front and back, and a copper head positive electrode and a copper head negative electrode are respectively installed thereon; one end of the electrofusion wire is connected to the copper head positive electrode and the other end is connected to the copper head negative electrode.
[0006] As a preferred technical solution: the outer diameter of the positive copper head is L1, the diameter of the through hole is L, and L1 = (1.1-1.2)L. In this state, the positive copper head is directly pressed into the through hole by external force; the installation structure of the negative copper head is the same as that of the positive copper head.
[0007] As a preferred technical solution: the outer diameter of the positive copper head is equal to the outer diameter of the through hole; in this state, the positive copper head can be fixedly installed in the through hole by means of threaded connection; the installation structure of the negative copper head is the same as that of the positive copper head.
[0008] As a preferred technical solution: the outer diameter of the positive copper head is equal to the outer diameter of the through hole; the inner wall of the through hole is provided with annularly distributed slots, and the outer wall of the positive copper head is provided with a protrusion, which is matched and installed with the slots; and the cross-section of the protrusion is an arc-shaped structure; the installation structure of the negative copper head is the same as that of the positive copper head.
[0009] A further preferred technical solution: the electrofusion wire is directly pressed into the outer wall of the tube body by external force.
[0010] A further preferred technical solution: a spirally distributed mounting groove is provided on the outer wall of the tube, and the electrofusion wire is adapted to be wound and installed in the mounting groove.
[0011] A further preferred technical solution: the lower end of the positive copper head is provided with a connecting hole for connecting the electric fuse wire; a fastening hole is also provided on one side of the positive copper head, and the fastening hole is perpendicular to the connecting hole; a clamping rod is threadedly installed at the fastening hole, and a metal pressure plate is provided at the inner end of the clamping rod for pressing the electric fuse wire into stable contact with the positive copper head; the outer end face of the clamping rod does not exceed the outer wall of the positive copper head; the mounting structure of the negative copper head is the same as that of the positive copper head.
[0012] The advantages of this utility model compared to the prior art are as follows: This utility model aims to solve the problem of separation between plastic and steel wire or steel plate when exposed to water in existing steel-plastic composite pipes. Compared with traditional sealing methods, it is simple, efficient and stable. It avoids the unstable connection caused by the electrofusion wire of commonly used electrofusion fittings being used on the inner wall of the fitting to connect with the outer wall of the electrofusion pipe. This sealing fitting involves winding and laying wire on the outer wall of the joint pipe body, and connecting with the electrofusion wire through the positive and negative copper terminals inserted into the joint pipe head. The outer wall of the connector (pipe body) is electrofused with the electrofusion fitting later to achieve complete separation of the inner and outer electrofusion from the cross-section of the pipe material, preventing water from seeping into the composite layer of the pipe material. Compared with traditional steel-plastic composite pipe sealing methods, the installation is standardized, efficient, fast, safe and reliable, and more practical. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a perspective view of the overall structure of Embodiment 1 of this utility model;
[0015] Figure 2 for Figure 1The front view;
[0016] Figure 3 for Figure 2 Enlarged view of part A in the diagram;
[0017] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention;
[0018] Figure 5 This is a schematic diagram of the structure of Embodiment 3 of this utility model;
[0019] Figure 6 for Figure 5 Enlarged view of section B in the diagram.
[0020] In the diagram: 1. Tube body; 2. Tube head; 3. Electro-fusible wire; 4. Through hole; 5. Positive copper head; 6. Negative copper head; 7. Slot; 8. Protrusion; 9. Mounting slot; 10. Connecting hole; 11. Fastening hole; 12. Clamping rod; 13. Metal pressure plate. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] It should be noted that, in the specific embodiments of this utility model, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the use of phrases such as "comprising one" to define an element does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "equipped" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0024] Example 1: As Figures 1 to 2 As shown:
[0025] A sealing pipe fitting with internal electrofusion connection includes a pipe body 1 and a pipe head 2. The pipe body 1 is arranged horizontally and has a ring structure. An electrofusion wire 3 is provided on the outer wall of the pipe body 1. The electrofusion wire 3 is spirally wound and installed on the outer wall of the pipe body 1, keeping the electrofusion wire 3 flush with the outer wall of the pipe body 1. In a preferred embodiment, the outer diameter of the copper head positive electrode 5 is L1, and the diameter of the through hole 4 is L, where L1 = (1.1-1.2)L. In this state, the copper head positive electrode 5 is directly pressed into and installed at the through hole 4 by external force; this arrangement simplifies assembly and provides good fastening. The installation structure of the copper head negative electrode 6 is the same as that of the copper head positive electrode 5. The electrofusion wire 3 is directly pressed into the outer wall of the pipe body 1 by external force. Specifically, the electrofusion wire can be directly pressed into the outer wall of the pipe body using a lathe. The pipe head 2 is located at the right end of the pipe body 1, and the two are integrally formed. The outer diameter of the pipe head is larger than the outer diameter of the pipe body, while the inner diameters of the two are consistent. A through hole 4 is also provided at the pipe head 2. Specifically, a through hole is opened on the end face of the pipe head for installing a copper head electrode. There are two through holes 4 symmetrically distributed front and back, and copper head positive electrode 5 and copper head negative electrode 6 are installed respectively. For better identification, positive and negative electrode marking points can be set at the corresponding through holes. One end of the electrofusion wire 3 is connected to the copper head positive electrode 5, and the other end is connected to the copper head negative electrode 6. This arrangement forms a current loop. The sealing fitting is made by winding and laying wire on the outer wall of the connector pipe body, and connecting to the electrofusion wire through the copper head positive and copper head negative electrodes inserted into the connector pipe head. The outer wall of the connector (pipe body) is later electrofused with the electrofusion fitting to achieve complete separation of the inner and outer electrofusion from the cross-section of the pipe material, preventing water from seeping into the composite layer of the pipe material. Compared with the traditional steel-plastic composite pipe sealing method, the installation is standardized, efficient, fast, safe and reliable.
[0026] Example 2: As Figure 4 As shown: This embodiment is largely similar to the technical solution of Embodiment 1, except that: a sealing pipe fitting with internal electrofusion connection further includes: the outer diameter of the copper head positive electrode 5 is equal to the outer diameter of the through hole 4. In this state, the copper head positive electrode 5 can be fixedly installed in the through hole 4 by means of threaded connection. The installation structure of the copper head negative electrode 6 is the same as that of the copper head positive electrode 5. The purpose of this setting is to facilitate matching installation, and the advantage is that it is easy to disassemble and replace while ensuring a stable connection. In a preferred technical solution, a spirally distributed installation groove 9 is also provided on the outer wall of the pipe body 1, and the electrofusion wire 3 is adapted and wound around the installation groove 9. Specifically, the cross-section of the installation groove can be designed as an arc structure larger than the semicircle of the electrofusion wire, which facilitates the formation of a snap-fit installation structure. This setting facilitates the adaptation and installation of the electrofusion wire, and the electrofusion wire can be easily tightened without the need for external pressure equipment.
[0027] Example 3: As Figure 5 and Figure 6 As shown: This embodiment is largely similar to the technical solution of Embodiment 1, except that: a sealing pipe fitting for internal electrofusion connection further includes: the outer diameter of the copper head positive electrode 5 is equal to the outer diameter of the through hole 4. A ring-shaped groove 7 is also provided on the inner wall of the through hole 4, and a protrusion 8 is provided on the outer wall of the copper head positive electrode 5, the protrusion 8 being matched and installed with the groove 7. The cross-section of the protrusion 8 is arc-shaped; the installation structure of the copper head negative electrode 6 is the same as that of the copper head positive electrode 5. The purpose of this design is to facilitate matching and installation, and its advantage is that it facilitates disassembly and replacement while ensuring a stable connection.
[0028] Example 4: Figure 3 As shown: Based on Embodiment 1, Embodiment 2, or Embodiment 3, a sealing fitting for internal electrofusion connection further includes: a connecting hole 10 at the lower end of the copper head positive electrode 5 for connecting the electrofusion wire 3. A fastening hole 11 is also provided on one side of the copper head positive electrode 5. The fastening hole 11 is perpendicularly distributed to the connecting hole 10. A clamping rod 12 is threadedly installed at the fastening hole 11, and a metal pressure plate 13 is provided at the inner end of the clamping rod 12 for pressing the electrofusion wire 3 into stable contact with the copper head positive electrode 5; wherein, the metal pressure plate can adopt an arc-shaped structure, and a bearing is provided between the metal pressure plate and the clamping rod to ensure that the clamping rod rotates while the metal pressure plate does not rotate but only moves inward and outward. In the installed state, the outer end face of the clamping rod 12 does not exceed the outer wall of the copper head positive electrode 5; this setting forms good integrity, and the installation structure of the copper head negative electrode 6 is the same as that of the copper head positive electrode 5. The purpose of this design is to facilitate a secure connection between the electric fuse and the copper electrode, while also allowing for separate installation of the two components, making it easier to replace either part. This results in a higher cost-performance ratio and greater practicality.
[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An electrofusion sealed pipe coupling, characterised in that: It includes pipe body (1) and pipe head (2), the pipe body (1) is distributed left and right, and is annular structure, the outer wall of pipe body (1) is equipped with electric fuse (3), the electric fuse (3) is installed in the outer wall of pipe body (1) in spiral winding distribution, and keeps electric fuse (3) flush with the outer wall of pipe body (1), the pipe head (2) is arranged at the right end of pipe body (1), and the both are integrally formed, and the pipe head (2) is also equipped with through hole (4), the through hole (4) is two front and back symmetrical distribution, and is respectively installed with copper head positive pole (5) and copper head negative pole (6), one end of electric fuse (3) is connected with copper head positive pole (5), the other end is connected with copper head negative pole (6).
2. An electrofusion sealed pipe coupling according to claim 1, wherein: The outer diameter of copper head positive pole (5) is L1, the diameter of through hole (4) is L, L1=(1.1-1.2)L, in this state, copper head positive pole (5) is directly installed in through hole (4) by external force, the installation structure of copper head negative pole (6) is same with copper head positive pole (5).
3. An electrofusion sealed pipe coupling according to claim 1, wherein: The outer diameter of copper head positive pole (5) is equal to the outer diameter of through hole (4), in this state, copper head positive pole (5) can be fixedly installed in through hole (4) by screw connection, the installation structure of copper head negative pole (6) is same with copper head positive pole (5).
4. An electrofusion sealed pipe coupling according to claim 1, wherein: The outer diameter of copper head positive pole (5) is equal to the outer diameter of through hole (4), the through hole (4) is also equipped with annular distribution's clamping groove (7) in the inner wall, the outer wall of copper head positive pole (5) is also equipped with clamping convex (8), the clamping convex (8) is matched with the installation of clamping groove (7), and the cross section of clamping convex (8) is arc structure, the installation structure of copper head negative pole (6) is same with copper head positive pole (5).
5. An electrofusion end seal pipe according to any one of claims 2, 3 or 4, wherein: The electric fuse (3) is directly pressed into the outer wall of pipe body (1) by external force.
6. An electrofusion end seal pipe according to any one of claims 2, 3 or 4, wherein: The outer wall of pipe body (1) is also equipped with spiral distribution's installation groove (9), and the electric fuse (3) is adaptively wound and installed in the installation groove (9).
7. An electrofusion end seal pipe as claimed in any one of claims 2, 3 or 4, wherein: The lower end of copper head positive pole (5) is equipped with connecting hole (10) for connecting electric fuse (3), one side of copper head positive pole (5) is also equipped with fastening hole (11), and the fastening hole (11) is vertically distributed with connecting hole (10), the fastening hole (11) is threadedly installed with compression rod (12), the inner end of compression rod (12) is equipped with metal pressing plate (13) for pressing electric fuse (3) and copper head positive pole (5) to stably contact, the outer end surface of compression rod (12) does not exceed the outer wall of copper head positive pole (5), the installation structure of copper head negative pole (6) is same with copper head positive pole (5).