Electric melting pipe fitting

Abstract

The utility model relates to the field of plastic pipeline welding, in particular to an electric melting pipe fitting which comprises two heating wires and a rubber coating layer coating the whole heating wires, the two heating wires are evenly distributed on the cross section of a rubber coating wire, the rubber coating wire is evenly, tightly and spirally distributed on a mold core to form a melting area of the electric melting pipe fitting, and the electric melting pipe fitting is made of plastic. Two heating wires at one end of the rubber-coated wire are respectively connected into two binding posts of the flange sleeve, and two heating wires at the other end of the rubber-coated wire are connected through a wire clamp short circuit. In the welding process, the heating wire does not vertically turn back to transversely penetrate through the spiral heating coil, so that the condition of short circuit caused by the turn-back heating wire does not exist; meanwhile, due to the arrangement mode of the heating wires, the current directions between the adjacent heating wires are opposite, and the wire doubling condition is not likely to be caused in the welding process. In addition, the number of uncorrelated rubber-coated wires is reduced through the double-core rubber-coated wires, the number of turns of winding is reduced, and efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of plastic pipe welding, and more specifically, to an electric fusion pipe fitting. Background Art

[0002] Electric fusion pipe fitting technology is currently widely used in the field of pipeline connection. Its principle is to implant a heating wire into the inner wall of the pipe socket, insert the scraped pipe, and the electric fusion welding machine outputs a constant voltage or current to supply the heating wire, so that the heating wire preset in the pipe generates heat to heat the outer wall of the pipe and the pipe. The molecular chains of the molten pipe and the pipe are reconnected under a certain pressure. After the set welding time is reached, the pipe and the pipe enter the cooling stage. During the cooling process, the molecular chains between the pipe and the pipe are rearranged and crystallized to achieve the purpose of welding the pipe and the pipe. Electric fusion pipe fittings refer to pipe fittings that use the high temperature generated by electric current to melt multiple polyethylene pipe fittings in contact with each other and then connect them together. Compared with traditional pipe connection methods, such as threaded connection and plug-in connection, since the pipe fittings need to be rotated or force applied during the connection process, on-site construction operations are very difficult for some large pipe fittings. The electric fusion connection method has outstanding advantages in construction projects. For polyethylene pipe fittings, two pipe fittings can be easily connected using electric fusion welding technology. The current mainstream technologies are mainly divided into pre-wiring electric fusion pipe fittings and post-wiring electric fusion pipe fittings. Pre-wiring electric fusion pipe fittings are to pre-coat the heating wire with a layer of the same pipe material, and then wind the rubber-coated wire around the core as required, and then put it into the mold for injection molding. After the mold is removed and cooled for a certain period of time, the core is pulled out to complete the product production. Post-wiring electric fusion pipe fittings are to first inject a material blank, and then machine a shallow groove to implant the heating wire.

[0003] At present, when the pre-wired electric fusion pipe fittings are used to make electric fusion flanges and electric fusion pipe caps, smoke or glue spraying caused by short circuits often occurs during welding inspection. The reason is that the two terminal posts need to be at one end of the non-pressure zone due to product characteristics. Therefore, when the product heating wire is wound, it is necessary to fold back the terminal end above the spiral heating wire when it reaches the end. The folded back straight rubber-coated wire needs to be protected by a wire sheath to maintain a safe distance from the spiral rubber-coated wire. However, in actual operation, workers sometimes forget to place the rubber sheath or wash away the rubber sheath during injection molding, which can easily cause smoke and glue spraying due to short circuits during welding. Utility Model Content

[0004] The utility model provides an electric fusion pipe fitting to overcome the problem described in the prior art that workers sometimes forget to place the rubber-coated wire during actual operation or wash away the rubber-coated wire during injection molding, which easily leads to smoke and glue spraying due to short circuit during welding.

[0005] The utility model aims to solve the above technical problems at least to a certain extent.

[0006] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0007] An electric fusion pipe fitting comprises an electric fusion flange sleeve body, two heating wires, terminal posts at both ends and a wire clamp, wherein the heating wires and the terminal posts are both arranged in the electric fusion flange sleeve body, and all the heating wires are spirally wound multiple times and fixed on the inner wall of the electric fusion flange sleeve body, one end of all the heating wires are connected to the terminal posts one by one, and the other end is short-circuited by a wire clamp.

[0008] Furthermore, it also includes a rubber-coated wire, and the two heating wires are wrapped by the rubber-coated wire, and the rubber-coated wire fits tightly when it is wound on the core.

[0009] Furthermore, the heating wire is divided into a first heating wire and a second heating wire, the first heating wire and the second heating wire are tightly wound on the core to form a spiral line, and the first heating wire and the second heating wire are connected to each other at the same end.

[0010] Furthermore, the terminal is divided into a first terminal and a second terminal, the first heating wire is connected to the first terminal, and the second heating wire is connected to the second terminal.

[0011] Furthermore, the first heating wire and the second heating wire located on the inner side wall of the electrofusion flange sleeve body have equal spacing between adjacent circles, and the first heating wire and the second heating wire are evenly distributed on the inner side wall of the electrofusion flange sleeve body.

[0012] Furthermore, the cross section of the rubber-coated wire is a concave rectangle.

[0013] Furthermore, a protrusion is provided in the middle portion of the cross section of the rubber-coated wire, and the height of the protrusion is not greater than the melting depth during electric fusion welding.

[0014] Furthermore, the rubber-coated wire is made of PE, fusible material PPR and PER-T.

[0015] Furthermore, the first terminal and the second terminal are columnar bodies, which are fixed in the main body of the electric fusion flange sleeve.

[0016] Furthermore, a mounting groove is provided on the outer edge of the flange sleeve body, and the first terminal and the second terminal are both installed on the inner side of the mounting groove.

[0017] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:

[0018] The utility model uses two heating wires to be coated with rubber as a whole, so the area of ​​contact with the core is increased, and the resistance is also increased, which reduces the situation where there is plastic injection between the wires due to wire punching during injection molding. Since the heating wire does not need to be folded back vertically to pass through the heating coil during welding, there is no situation where the heating wire is folded back to cause a short circuit; in addition, because the current directions between adjacent heating wires are opposite in arrangement, the force between the heating wires reduces the possibility of short circuit during AC welding. In addition, the double-core rubber-coated wire reduces the number of unrelated rubber-coated wires, reduces the number of winding turns, and improves efficiency. At the same time, it is easier to operate and easier to find problems such as flanging during the winding process. It solves the problem that the electric fusion pipe fittings are prone to product instability when the wiring is first done, and the rubber-coated wire position is easy to separate from the main body of the electric fusion pipe fittings when peeling, thereby ensuring the welding effect and improving the reliability of the pipeline system connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of an electric fusion pipe fitting according to the present invention;

[0020] Figure 2 It is a partial enlarged view of the present embodiment;

[0021] Figure 3 It is a partial enlarged view of the present invention;

[0022] In the figure, 1. main body of the electric fusion flange sleeve; 2. heating wire; 3. terminal; 4. rubber-coated wire; 5. first heating wire; 6. second heating wire; 31. first terminal; 32. second terminal. DETAILED DESCRIPTION

[0023] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0024] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0025] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Example 1

[0028] An electrofusion pipe fitting, such as Figure 1 As shown, it includes an electric fusion flange sleeve body 1, two heating wires 2, terminal posts 3 at both ends and a wire clamp 7. The heating wires 2 and the terminal posts 3 are both arranged in the electric fusion flange sleeve body 1. The plastic-coated wire of the heating wire 2 is wrapped around the inner wall of the electric fusion flange sleeve body 1 for multiple turns. One end of the heating wire 2 is connected to the terminal post 3 one by one, and the other end is short-circuited by the wire clamp 7.

[0029] In the specific implementation process, the heating wire is evenly and tightly distributed on the core to form an electric fusion melting zone. Because two wires are integrally coated with rubber, the area of ​​a single integral contact with the core increases, and the resistance will also increase. Therefore, the wire punching during injection molding can be reduced, and the injection molding between wires can be reduced. The heating wire is wound multiple times and fixed on the inner wall of the electric fusion flange sleeve body 1, which makes the winding operation easier. After the injection molding is completed, the rubber-coated wire is between the outer wall of the pipe and the injection-molded inner wall of the electric fusion pipe fitting. The double-core rubber-coated wire is short-circuited at another section of pure copper C-type wire clamp, which can maintain the contact pressure between the two heating wires for a long time and constantly. The contact pressure changes very little with changes in the external environment and load conditions, and the contact resistance is basically negligible, and the product will not be caused by short-circuiting problems.

[0030] Example 2

[0031] This embodiment further discloses the following contents based on the embodiment 1:

[0032] It also includes a rubber-coated wire 4, which is evenly and tightly distributed on the core to form a molten zone of the electric fusion pipe fitting. After injection molding is completed, it is between the outer wall of the pipe and the injection-molded inner wall of the electric fusion pipe fitting. Because two wires are integrally coated with rubber, the area contacting the core is increased, and the resistance is also increased, thereby reducing the situation where there is injected plastic between the wires due to wire punching during injection molding. By using this rubber-coated wire, the heating wire does not need to be folded back vertically to pass through the heating coil during welding, so there is no situation where the folded heating wire causes a short circuit. All heating wires 2 are wrapped by the rubber-coated wire 4, and the rubber-coated wire is tightly fitted when winding on the core. The double-core rubber-coated wire is evenly and tightly distributed on the core to form an electric fusion molten zone, and the winding operation is easier and more efficient.

[0033] like Figure 2 As shown, the two heating wires of the rubber-coated wire are parallel and evenly distributed in the rectangular rubber-coated wire, and the heating wire 2 is divided into a first heating wire 5 and a second heating wire 6. The first heating wire 5 and the second heating wire 6 are bent into a spiral shape, and the first heating wire 5 and the second heating wire 6 are connected to each other at the same end.

[0034] The terminal 3 is divided into a first terminal 31 and a second terminal 32. The first heating wire 5 passes through the first terminal 31, passes back from the second terminal 32 and is connected to the second heating wire 6. During the welding process, since the first heating wire and the second heating wire do not need to be folded back vertically to pass through the heating coil, there is no situation where the folded heating wire causes a short circuit. In addition, because the heating wires are arranged in opposite directions between adjacent heating wires, the force between the heating wires reduces the possibility of short circuit during AC welding. In addition, the double-core rubber-coated wire reduces the number of unrelated rubber-coated wires, reduces the number of winding turns, and improves efficiency. At the same time, it is easier to operate and easier to find problems such as flanging during the winding process. The problem that the electric fusion pipe fittings are prone to product instability when the wiring is first made and the rubber-coated wire position is easily separated from the main body of the electric fusion pipe fittings during stripping is solved, thereby ensuring the welding effect and improving the reliability of the pipeline system connection.

[0035] like Figure 3 As shown, the first heating wire 5 and the second heating wire 6 located on the inner wall of the electric fusion flange sleeve body 1 have equal spacing between adjacent circles, and the center distance between the heating wires is twice the distance between the heating wires from the sides. During the power-on welding process, the current directions between adjacent heating wires are opposite and the forces are balanced, so it is not easy for the heating wires to move or be paralleled. The double-core rubber-coated wire is short-circuited at another section of pure copper C-type wire clamp, which can maintain the contact pressure between the two heating wires for a long time and constantly. The contact pressure changes very little with changes in the external environment and load conditions, and the contact resistance is basically negligible, and the product will not be caused by open circuit problems due to poor short-circuiting.

[0036] In the specific implementation process, the first wiring electric fusion pipe fittings are to pre-wrap the heating wire with a layer of the same pipe fitting material, and then wind the rubber-coated wire on the core as required. The rubber-coated wire includes two heating wires and a rubber-coated layer wrapped around the heating wire as a whole. The cross-section of the rubber-coated wire has two heating wires evenly distributed, and the rubber-coated wire is evenly and tightly distributed on the core to form a molten zone of the electric fusion pipe fitting. The two heating wires at one end of the rubber-coated wire are respectively connected to the two terminal posts of the flange sleeve, and the two heating wires at the other end are short-circuited by a wire clamp. Then, they are placed in a mold for injection molding. After the mold is removed and cooled for a certain period of time, the core is pulled out to complete the product production, thereby solving the problem that the first wiring electric fusion pipe fittings are prone to product instability and the rubber-coated wire position is easy to separate from the main body of the electric fusion pipe fitting during peeling, thereby ensuring the welding effect and improving the reliability of the pipeline system connection.

[0037] Before power is turned on, the pipe is inserted into one end of the pipe fitting, the outer wall of the pipe and the inner wall of the pipe fitting are aligned, and then power is turned on at the terminal head, the inner wall and outer wall of the pipe, and the inner wall of the outer ring on the corresponding annular groove surface of the pipe fitting and the inner wall of the inner ring on the corresponding annular groove surface of the pipe fitting can be plastically deformed and melted at the same time, and after a certain period of time after the power is turned off, the softened and molten plastic material is re-solidified after cooling again. At this time, the pipe fitting and one end of the pipe head are firmly connected together in the form of plastic deformation electric melting welding, and the terminal head is partially buried in the pipe body, and its top is exposed outside the pipe body. The outer edge of the end wall of the end head is provided with an installation groove, and the terminal head is installed in the installation groove. The utility model solves the problem that because two terminal posts need to be set at one end of the non-pressure-bearing area, when the product heating wire is wound, it is necessary to fold back the terminal post end above the spiral heating wire when it is wound to the end, and the folded back section of the straight rubber-coated wire needs to be covered with a wire sheath to maintain a safe distance from the spiral rubber-coated wire, and smoke and glue spraying will not occur due to short circuit during welding.

[0038] Example 3

[0039] This embodiment further discloses the following contents based on Embodiments 1 and 2:

[0040] The cross section of the rubber-coated wire 4 is a concave rectangular shape, which can effectively reduce product waste caused by the turning of the rubber-coated wire during the winding process.

[0041] The middle part of the cross section of the rubber-coated wire 4 has a protrusion, the height of which is not greater than the welding depth during electric melting, so as to enhance the adhesion between the rubber-coated wire and the main body during injection molding and prevent the wire from coming off.

[0042] The rubber-coated wire 4 is made of PE, fusible materials PPR and PER-T, which have the characteristics of light weight, corrosion resistance, no scaling, long service life, etc.

[0043] The first terminal post 31 and the second terminal post 32 are columnar bodies, which are fixed in the fusion flange sleeve body 1 .

[0044] The heating wire comprises a first heating wire and a second heating wire, the ends of the first heating wire and the second heating wire on the same side are connected to each other, the first heating wire and the second heating wire are bent face to face to form a spiral wire, and the ends of the first heating wire and the second heating wire on the other side are connected to two different connection ends.

[0045] The pipe is inserted into one end of the pipe fitting, and the outer wall of the pipe corresponds to the inner wall of the pipe fitting. When the terminal head is energized, the inner wall and outer wall of the pipe, as well as the outer ring inner wall on the corresponding annular groove surface of the pipe fitting and the inner ring inner wall on the corresponding annular groove surface of the pipe fitting can be plastically deformed and melted at the same time, and after a certain period of time after the power is turned off and the softened and molten plastic material is cooled again, the softened and molten plastic material solidifies again. At this time, the pipe fitting and one end of the pipe head are firmly connected together by plastic deformation electric fusion welding.

[0046] The heating wires at both ends are interconnected and connected to terminals; one end of the tube body has a terminal, wherein a pair of first terminals and a second terminal are connected to the end wall of one of the end heads, the terminal is partially buried in the tube body, and the top is exposed to the outside of the tube body, and the other pair of terminals is arranged in the middle of the outer wall of the tube body, the heating wire is connected to the first terminal and the second terminal, and the terminal is perpendicular to the outer wall of the tube body.

[0047] The outer edge of the flange sleeve body 1 is provided with a mounting groove, and the first terminal post 31 and the second terminal post 32 are both mounted in the mounting groove.

[0048] In the specific implementation process, during the power welding process, the current directions between adjacent heating wires are opposite and the forces are balanced, so it is not easy for the heating wires to move or be paralleled. During AC welding, the force between the heating wires reduces the possibility of short circuit. In addition, the double-core rubber-coated wire reduces the number of unrelated rubber-coated wires, reduces the number of turns of winding, and improves efficiency. At the same time, it is easier to operate and easier to find problems such as flanging during the winding process. It solves the problem that the first wiring electric fusion pipe fittings are prone to product instability and the rubber-coated wire position is easy to separate from the main body of the electric fusion pipe fittings during stripping, thereby ensuring the welding effect and improving the reliability of the pipeline system connection. It overcomes the shortcomings of the single heating wire rubber-coated wire of the first wiring electric fusion pipe fittings when making electric fusion flanges and electric fusion pipe caps. The overall contact surface of the rubber-coated wire and the core is more than that of the single wire, and the friction is increased. It is not easy to run the wire during injection molding, which reduces waste. The double-core rubber-coated wire is not only limited to electric fusion flange products, electric fusion pipe caps and other similar products.

[0049] The same or similar reference numerals correspond to the same or similar components;

[0050] The terms used in the drawings to describe positional relationships are only used for illustrative purposes and should not be construed as limiting this patent;

[0051] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. An electric fusion pipe fitting, characterized in that: The invention comprises an electric fusion flange sleeve body (1), two heating wires (2), two-end terminal posts (3) and a wire clamp (7), wherein the heating wires (2) and the terminal posts (3) are both arranged in the electric fusion flange sleeve body (1), and all the heating wires (2) are spirally wound for multiple turns and fixed on the inner wall of the electric fusion flange sleeve body (1), and one end of all the heating wires (2) is connected to the terminal posts (3) in a one-to-one correspondence, and the other end is short-circuited by the wire clamp (7).

2. An electric fusion pipe fitting according to claim 1, characterized in that: It also includes a rubber-coated wire (4), and the two heating wires (2) are wrapped by the rubber-coated wire (4), and the rubber-coated wire (4) fits tightly when it is wound on the core.

3. An electric fusion pipe fitting according to claim 2, characterized in that: The heating wire (2) is divided into a first heating wire (5) and a second heating wire (6). The first heating wire (5) and the second heating wire (6) are tightly wound on the core to form a spiral line. The first heating wire (5) and the second heating wire (6) are connected to each other at the same end.

4. An electric fusion pipe fitting according to claim 3, characterized in that: The terminal (3) is divided into a first terminal (31) and a second terminal (32); the first heating wire (5) is connected to the first terminal (31), and the second heating wire (6) is connected to the second terminal (32).

5. An electric fusion pipe fitting according to claim 4, characterized in that: The first heating wire (5) and the second heating wire (6) located on the inner side wall of the electrofusion flange sleeve body (1) have equal spacing between adjacent circles, and the first heating wire (5) and the second heating wire (6) are evenly distributed on the inner side wall of the electrofusion flange sleeve body (1).

6. An electric fusion pipe fitting according to claim 2, characterized in that: The cross section of the rubber-coated wire (4) is a concave rectangle.

7. An electric fusion pipe fitting according to claim 6, characterized in that: The middle part of the cross section of the rubber-coated wire (4) has a protrusion, and the height of the protrusion is not greater than the melting depth during electric fusion welding.

8. An electric fusion pipe fitting according to claim 4, characterized in that: The first terminal post (31) and the second terminal post (32) are columnar bodies, which are fixed in the main body (1) of the electric fusion flange sleeve.

9. An electric fusion pipe fitting according to claim 8, characterized in that: The outer edge of the flange sleeve body (1) is provided with a mounting groove, and the first terminal post (31) and the second terminal post (32) are both mounted inside the mounting groove.

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