Terminal protection electric melting pipe fitting

Abstract

The utility model relates to the technical field of electric melting pipe fittings, in particular to a terminal protection electric melting pipe fitting. Comprising a prefabricated composite pipe, a resistance wire and a wiring terminal assembly, the wiring terminal assembly comprises a connecting assembly and a binding post, the connecting assembly is arranged in a mounting through hole, one end of the connecting assembly is connected with the resistance wire, the other end of the connecting assembly is detachably connected with one end of the binding post, and the binding post is detachably connected with the connecting assembly. And the other end of the binding post extends out of the outer surface of the prefabricated composite pipe. According to the utility model, the binding post extends out of the outer surface of the prefabricated composite pipe, so that the electric fusion welding machine and the binding post assembly can be stably connected; the connecting assembly is arranged in the mounting through hole, the other end of the connecting assembly is detachably connected with one end of the binding post, when hot melting is not needed, the binding post is detached, the remaining connecting assembly is located in the prefabricated composite pipe, the binding post assembly is prevented from being exposed, and the binding post can be protected.

Description

Technical Field

[0001] The utility model relates to the technical field of electric fusion pipe fittings, and more specifically, to a terminal protection electric fusion pipe fitting. Background Art

[0002] When the length of the pipe is not enough and multiple pipes need to be connected, electric fusion pipe fittings are usually used to connect multiple pipes into one pipeline through electric fusion connection. Electric fusion connection uses the resistance wire on the inner surface of the electric fusion pipe fitting to energize and heat it, so that the material on the inner surface of the pipe fitting and the outer surface of the socket pipe reaches the melting temperature. The expansion of the heated material generates welding pressure, and after molecular transfer, diffusion, entanglement, and cooling, it fuses into one, achieving the purpose of welding. Usually, the resistance wire is connected to the terminal block, and the resistance wire is energized and heated through the terminal block during welding. However, the exposed one-piece terminal block will inevitably cause collisions between pipes or collisions between pipes and other objects during transportation, which can easily cause the terminal to break, making construction welding impossible.

[0003] The prior art discloses a double-layer electric fusion pipe fitting in which the connection section of the terminal is located within a terminal accommodating slot, with the top of the connection section not extending beyond the outer surface of the outer tube. The terminal is designed to be lower than the outer wall of the outer tube. After the fitting is inserted onto the outer tube, the terminal accommodating slot can be sealed, protecting the terminal from corrosion and further preventing leakage at the terminal connection. However, the connection section of the terminal, which does not extend beyond the outer surface of the outer tube, makes it difficult to securely connect to the electric fusion welding machine, which can affect welding quality. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings that the power connection section of the terminal post whose top does not extend out of the outer surface of the outer tube is difficult to be firmly connected to the electric fusion welding machine, which easily affects the welding quality, and provide a terminal protection electric fusion pipe fitting that can protect the terminal and facilitates a firm connection with the electric fusion welding machine.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0006] A terminal protection electric fusion pipe fitting includes a prefabricated composite pipe, a resistance wire and a terminal assembly, wherein the resistance wire is wound on the inner wall of the prefabricated composite pipe, and the prefabricated composite pipe is provided with a mounting through hole; the terminal assembly includes a connecting assembly and a terminal post, wherein the connecting assembly is arranged in the mounting through hole, one end of the connecting assembly is connected to the resistance wire, and the other end of the connecting assembly is detachably connected to one end of the terminal post, and the other end of the terminal post extends out of the outer surface of the prefabricated composite pipe.

[0007] According to the above technical means, the utility model provides a terminal protection electric fusion pipe fitting. When connecting two pipes, the two pipes to be connected are respectively inserted from both ends of the prefabricated composite pipe, so that the outer wall of the inserted pipe abuts against the inner wall of the prefabricated composite pipe, the terminal is connected to the connection component, and an electric fusion welding machine is used to connect the terminal to the terminal for electrical connection. The resistance wire is energized through the terminal to allow the prefabricated composite pipe and the pipe to be heat-fused, and the two pipes to be connected are connected through the prefabricated composite pipe. By extending the terminal from the outer surface of the prefabricated composite pipe, it is possible to facilitate the electric fusion welding machine and the terminal assembly to be firmly connected. By arranging the connection component in the mounting through-hole, and the other end of the connection component being detachably connected to one end of the terminal, when heat fusion is not required, the terminal is removed, and the remaining connection component is located in the prefabricated composite pipe, so as to avoid the terminal assembly from being exposed and protect the terminal.

[0008] Furthermore, the prefabricated composite pipe includes, from the inside out, an inner layer, a reinforcement layer, and an outer layer, the inner layer, the reinforcement layer, and the outer layer being sequentially connected, and the resistance wire being wound around the inner side of the inner layer. The reinforcement layer can enhance the strength of the prefabricated composite pipe.

[0009] Furthermore, the reinforcement layer includes, from the inside out, a first reinforcement layer, an intermediate layer, and a second reinforcement layer, wherein the inner layer, the first reinforcement layer, the intermediate layer, the second reinforcement layer, and the outer layer are sequentially connected. The first and second reinforcement layers enable the prefabricated composite pipe to withstand high pressure.

[0010] Furthermore, the first and second reinforcement layers each include hot melt adhesive and a steel mesh skeleton embedded within the hot melt adhesive. The hot melt adhesive connects the two sides of the middle layer to the inner layer and outer layer, respectively. By connecting the steel mesh skeleton to the middle layer, inner layer, and outer layer using hot melt adhesive, the peel strength between the layers of the prefabricated composite pipe can be improved.

[0011] Furthermore, the invention further comprises a circular sealing ring, which is arranged on the end face of the prefabricated composite pipe and is connected to the inner layer and the outer layer by heat-melting, thereby protecting the end face of the prefabricated composite pipe.

[0012] Furthermore, the connection assembly includes a base and a compression assembly for compressing the resistance wire. The base is removably mounted within the mounting hole, and the compression assembly is mounted on the base. The resistance wire passes through the base and is connected to the compression assembly. One end of the terminal block is removably connected to the base or the compression assembly. The connection assembly is connected to the prefabricated composite tube via the base, and the compression assembly compresses the resistance wire to prevent separation of the resistance wire from the terminal assembly.

[0013] Furthermore, the compression assembly includes a plurality of elastic meniscuses and a connecting tube for abutting the meniscuses. The meniscuses are provided on the base, with a threading space for the resistance wire passing through the plurality of meniscuses. The connecting tube is detachably connected to the base, and the inner diameter of the connecting tube gradually decreases from the end proximal to the base to the end distal to the base. One end of the terminal is detachably connected to the base or the connecting tube. The resistance wire is passed through the threading space to connect the connecting tube to the base. During connection, the inner wall of the connecting tube drives the meniscuses toward the threading space, and the plurality of meniscuses abut against the resistance wire, thereby pressing the resistance wire and preventing the resistance wire from separating from the terminal assembly.

[0014] Furthermore, the connecting tube and the terminal are both threadedly connected to the base, and a cross groove is provided at one end of the connecting tube away from the base. The cross groove makes it easy to use a screwdriver to rotate the connecting tube, thereby facilitating the installation and removal of the connecting tube.

[0015] Furthermore, a spiral groove is provided on the inner wall of the prefabricated composite tube, and the resistance wire is embedded and fixed in the groove, so as to facilitate fixing the position of the resistance wire.

[0016] Furthermore, the terminal block assembly is provided with two groups, and the two ends of the resistance wire are connected to the two groups of terminal block assemblies respectively. By providing two groups of terminal block assemblies, the resistance wire can be heated from both ends simultaneously, thereby improving the heat-melting efficiency.

[0017] Compared with the prior art, the beneficial effects are:

[0018] 1. The utility model provides a terminal protection electric fusion pipe fitting, which can facilitate the stable connection between the electric fusion welding machine and the terminal assembly by extending the terminal post out of the outer surface of the prefabricated composite pipe; by arranging the connecting component in the mounting through hole, and the other end of the connecting component is detachably connected to one end of the terminal post, when hot melting is not required, the terminal post is removed, and the remaining connecting component is located in the prefabricated composite pipe, thereby avoiding the terminal assembly from being exposed and protecting the terminal.

[0019] 2. The utility model provides a terminal protection electric fusion pipe fitting, which enables the prefabricated composite pipe to achieve high pressure resistance by arranging the first reinforcement layer and the second reinforcement layer; the wire mesh skeleton is connected with the middle layer, the inner layer and the outer layer by hot melt adhesive, which can improve the peeling strength between the layers of the prefabricated composite pipe.

[0020] 3. The utility model provides a terminal protection electric fusion pipe fitting, which is provided with a half-moon piece and a connecting tube. The inner wall of the connecting tube drives the half-moon piece to move toward the threading space. Multiple half-moon pieces are in contact with the resistance wire together to press the resistance wire tightly, which can prevent the resistance wire from being separated from the terminal assembly, and also facilitates the installation and separation of the resistance wire and the terminal assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a cross-sectional view of the overall structure of the terminal protection electric fusion pipe fitting of the utility model;

[0022] Figure 2 It is a partial cross-sectional view of the terminal assembly in the utility model;

[0023] Figure 3 It is a structural diagram of the half-moon piece in the utility model;

[0024] Figure 4 It is a cross-sectional view of the connecting pipe in the utility model;

[0025] Figure 5 This is a top view of the connecting pipe in the utility model;

[0026] Figure 6 yes Figure 1 A partial enlarged view of point A in the middle.

[0027] Among them, the markings in the figure are explained as follows: 1. Prefabricated composite pipe; 11. Mounting through hole; 12. Groove; 101. Inner layer; 102. Reinforcement layer; 121. First reinforcement layer; 122. Middle layer; 123. Second reinforcement layer; 103. Outer layer; 2. Resistance wire; 3. Terminal assembly; 301. Connection assembly; 311. Base; 312. Half-moon piece; 3121. Threading space; 313. Connecting tube; 3131. Inner diameter; 3132. Cross groove; 302. Terminal; 4. Sealing ring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The present invention is described in one of the embodiments below in combination with the specific implementation methods. Among them, the drawings are only for illustrative purposes and represent only schematic diagrams rather than physical drawings, and cannot be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0029] In the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" or "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that meet both A and B.

[0030] Example 1

[0031] like Figure 1 As shown, this embodiment proposes a terminal protection electric fusion pipe fitting, including a prefabricated composite pipe 1, a resistance wire 2 and a terminal assembly 3, the resistance wire 2 is wound on the inner wall of the prefabricated composite pipe 1, and the prefabricated composite pipe 1 is provided with a mounting through hole 11; the terminal assembly 3 includes a connecting assembly 301 and a terminal post 302, the connecting assembly 301 is arranged in the mounting through hole 11, the connecting assembly 301 is entirely located in the mounting through hole 11, and the connecting assembly 301 does not exceed the outer surface of the prefabricated composite pipe 1; the preferred length of the connecting assembly 301 is The detachable connection between the component 301 and the terminal 302 is flush with the outer surface of the prefabricated composite pipe 1. At this time, not only can the connection component 301 be located as a whole in the prefabricated composite pipe 1 for protection, but it can also facilitate the connection between the connection component 301 and the terminal 302; one end of the connection component 301 is connected to the resistance wire 2, and the other end of the connection component 301 is detachably connected to one end of the terminal 302, and the other end of the terminal 302 extends out of the outer surface of the prefabricated composite pipe 1, and the specific extension length is to facilitate electrical connection with the electric fusion welding machine.

[0032] According to the above technical means, the present invention provides a terminal protection electric fusion pipe fitting. When connecting two pipes, the two pipes to be connected are inserted from both ends of a prefabricated composite pipe 1, with the outer walls of the inserted pipes abutting the inner wall of the prefabricated composite pipe 1. The terminal 302 is connected to the connecting assembly 301, and an electric fusion welding machine is used to electrically connect the terminal 302. The resistance wire 2 is energized through the terminal 302 to heat-fuse the prefabricated composite pipe 1 and the pipes, and the two pipes to be connected are connected through the prefabricated composite pipe 1. By extending the terminal 302 from the outer surface of the prefabricated composite pipe 1, the electric fusion welding machine can facilitate a stable connection with the terminal assembly 3. By positioning the connecting assembly 301 within the mounting hole 11, and with the other end of the connecting assembly 301 being detachably connected to one end of the terminal 302, when heat-fusing is no longer required, the terminal 302 is removed, and the remaining connecting assembly 301 is located within the prefabricated composite pipe 1, preventing the terminal assembly 3 from being exposed and protecting the terminal.

[0033] Example 2

[0034] This embodiment proposes a terminal protection electric fusion pipe fitting. Based on the first embodiment, in this embodiment, Figure 6 As shown, the prefabricated composite pipe 1 includes, from the inside out, an inner layer 101, a reinforcement layer 102, and an outer layer 103. The inner layer 101, reinforcement layer 102, and outer layer 103 are sequentially connected, and the resistance wire 2 is wound around the inner side of the inner layer 101. The provision of the reinforcement layer 102 enhances the strength of the prefabricated composite pipe 1. The reinforcement layer 102 includes, from the inside out, a first reinforcement layer 121, an intermediate layer 122, and a second reinforcement layer 123. The inner layer 101, first reinforcement layer 121, intermediate layer 122, second reinforcement layer 123, and outer layer 103 are sequentially connected. The provision of the first reinforcement layer 121 and second reinforcement layer 123 enables the prefabricated composite pipe 1 to withstand high pressure, protects the joints of the pipe, and improves the strength of the pipe joints.

[0035] The first and second reinforcement layers 121, 123 both comprise hot melt adhesive and a steel mesh framework embedded within the adhesive. The middle layer 122 is connected to the inner layer 101 and outer layer 103 on either side via hot melt adhesive. The hot melt adhesive used here is highly compatible with the middle layer 122, inner layer 101, outer layer 103, and the steel mesh framework. Using hot melt adhesive to connect the steel mesh framework to the middle layer 122, inner layer 101, and outer layer 103 improves the peel strength between the layers of the prefabricated composite pipe 1, ensuring the high pressure-bearing and stability of the electrofusion pipe fitting in high and low temperature environments.

[0036] The inner wall of the prefabricated composite tube 1 is provided with a spiral groove 12, that is, the inner surface of the inner layer 101 is provided with a spiral groove 12, and the resistance wire 2 is embedded and fixed in the groove 12. The groove 12 facilitates the position of the resistance wire 2 to be fixed.

[0037] like Figure 1 As shown, it also includes an annular sealing ring 4, which is arranged on the end face of the prefabricated composite pipe 1 and is heat-melted to the inner layer 101 and the outer layer 103. The sealing ring 4 protects the end face of the prefabricated composite pipe 1.

[0038] Example 3

[0039] This embodiment proposes a terminal protection electric fusion pipe fitting. Based on the first embodiment, in this embodiment, Figure 2 As shown, the connection assembly 301 includes a base 311 and a compression assembly for compressing the resistor wire 2. The base 311 is removably mounted within the mounting hole 11. The compression assembly is mounted on the base 311. The resistor wire 2 passes through the base 311 and is connected to the compression assembly. One end of the terminal 302 is removably connected to the base 311 or the compression assembly. The connection assembly 301 is connected to the prefabricated composite tube 1 through the base 311, while the resistor wire 2 passes through the base 311. The base 311 guides the resistor wire 2, and the compression assembly compresses the resistor wire 2 to prevent it from separating from the terminal assembly 3.

[0040] like Figure 3 and Figure 4 As shown, the pressing assembly includes a plurality of elastic half-moons 312 and a connecting tube 313 for abutting the half-moons 312. The half-moons 312 are provided on the base 311. There is a threading space 3121 between the plurality of half-moons 312 for the resistance wire 2 to pass through. At least two half-moons 312 can be provided. The connecting tube 313 is detachably connected to the base 311. The inner diameter 3131 of the connecting tube 313 gradually decreases from one end close to the base 311 to the end away from the base 311. One end of the terminal 302 is detachably connected to the base 311 or the connecting tube 313. The resistance wire 2 is passed through the threading space 3121, and the position of the resistance wire 2 can be freely adjusted. The connecting tube 313 is connected to the base 311. During the connection, the inner wall of the connecting tube 313 drives the half-moon piece 312 to move toward the threading space 3121. Multiple half-moon pieces 312 are jointly in contact with the resistance wire 2, pressing the resistance wire 2 to prevent the resistance wire 2 from separating from the terminal assembly 3.

[0041] like Figure 5As shown, the connecting tube 313 and the terminal 302 are both threadedly connected to the base 311. A cross groove 3132 is provided at the end of the connecting tube 313 away from the base 311. When connecting the connecting tube 313 to the base 311, a screwdriver is inserted into the cross groove 3132 and rotated, driving the connecting tube 313 to rotate and connect with the base 311. This makes it easy to install and remove the connecting tube 313, and also allows the connecting tube 313 to be connected to the base 311 in place, thereby pressing the resistance wire 2 tightly.

[0042] like Figure 1 As shown, there are two groups of terminal assemblies 3, and the two ends of the resistance wire 2 are respectively connected to the two groups of terminal assemblies 3. By providing two groups of terminal assemblies 3, the resistance wire 2 can be heated from both ends at the same time, thereby improving the hot melt efficiency.

[0043] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0044] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A terminal protection electric fusion pipe fitting, comprising a prefabricated composite pipe (1), a resistance wire (2) and a terminal assembly (3), wherein the resistance wire (2) is wound on the inner wall of the prefabricated composite pipe (1), and the prefabricated composite pipe (1) is provided with a mounting through hole (11); characterized in that: The terminal assembly (3) comprises a connecting assembly (301) and a terminal post (302); the connecting assembly (301) is arranged in the mounting through hole (11); one end of the connecting assembly (301) is connected to the resistance wire (2); the other end of the connecting assembly (301) is detachably connected to one end of the terminal post (302); and the other end of the terminal post (302) extends out of the outer surface of the prefabricated composite tube (1).

2. The terminal protection electric fusion pipe fitting according to claim 1, characterized in that: The prefabricated composite pipe (1) comprises, from the inside to the outside, an inner layer (101), a reinforcement layer (102) and an outer layer (103); the inner layer (101), the reinforcement layer (102) and the outer layer (103) are connected in sequence; and the resistance wire (2) is wound on the inner side of the inner layer (101).

3. The terminal protection electric fusion pipe fitting according to claim 2, characterized in that: The reinforcement layer (102) includes, from the inside to the outside, a first reinforcement layer (121), an intermediate layer (122), and a second reinforcement layer (123); the inner layer (101), the first reinforcement layer (121), the intermediate layer (122), the second reinforcement layer (123), and the outer layer (103) are connected in sequence.

4. The terminal protection electric fusion pipe fitting according to claim 3, characterized in that: The first reinforcement layer (121) and the second reinforcement layer (123) both comprise hot melt adhesive and a steel wire mesh skeleton embedded in the hot melt adhesive, and both sides of the middle layer (122) are connected to the inner layer (101) and the outer layer (103) respectively through the hot melt adhesive.

5. The terminal protection electric fusion pipe fitting according to claim 2, characterized in that: It also includes a circular sealing ring (4), which is arranged on the end face of the prefabricated composite pipe (1), and the sealing ring (4) is hot-melt-connected to the inner layer (101) and the outer layer (103).

6. The terminal protection electric fusion pipe fitting according to any one of claims 1 to 5, characterized in that: The connecting assembly (301) comprises a base (311) and a pressing assembly for pressing the resistance wire (2); the base (311) is detachably arranged in the mounting through hole (11); the pressing assembly is arranged on the base (311); the resistance wire (2) passes through the base (311); the resistance wire (2) is connected to the pressing assembly; and one end of the terminal (302) is detachably connected to the base (311) or the pressing assembly.

7. The terminal protection electric fusion pipe fitting according to claim 6, characterized in that: The pressing assembly comprises a plurality of elastic half-moon pieces (312) and a connecting tube (313) for contacting the half-moon pieces (312). The half-moon pieces (312) are arranged on the base (311). A threading space (3121) for the resistance wire (2) to pass through is provided between the plurality of half-moon pieces (312). The connecting tube (313) is detachably connected to the base (311). The inner diameter (3131) of the connecting tube (313) gradually decreases from one end close to the base (311) to the other end away from the base (311). One end of the terminal (302) is detachably connected to the base (311) or the connecting tube (313).

8. The terminal protection electric fusion pipe fitting according to claim 7, characterized in that: The connecting tube (313) and the terminal (302) are both threadedly connected to the base (311), and a cross groove (3132) is provided at one end of the connecting tube (313) away from the base (311).

9. The terminal protection electric fusion pipe fitting according to any one of claims 1 to 5, characterized in that: A spiral groove (12) is provided on the inner wall of the prefabricated composite pipe (1), and the resistance wire (2) is embedded and fixed in the groove (12).

10. The terminal protection electric fusion pipe fitting according to any one of claims 1 to 5, characterized in that: The wiring terminal assemblies (3) are provided in two groups, and the two ends of the resistance wire (2) are respectively connected to the two groups of wiring terminal assemblies (3).

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