Double-rubber-ring PE composite sealing electric hot melting pipe fitting

Abstract

The utility model provides a double rubber ring PE composite sealing electric hot melting pipe fitting, which belongs to the technical field of electric melting pipe fittings and comprises a pipe fitting outer layer and a hot melting layer, the hot melting layer is sleeved in the pipe fitting outer layer, an electrode column is arranged on the pipe fitting outer layer, a first resistance wire is annularly arranged in the hot melting layer, the electrode column penetrates through the pipe fitting outer layer and is in lap joint with the first resistance wire, and the first resistance wire is in lap joint with the electrode column. The pipe fitting further comprises a reinforcing layer, baffle rings and a plurality of expansion screws, the reinforcing layer is arranged between the pipe fitting outer layer and the hot melting layer, an expansion cavity is reserved between the reinforcing layer and the pipe fitting outer layer, second resistance wires are annularly arranged in the reinforcing layer and in lap joint with the electrode columns, the baffle rings are arranged at the two ends of the pipe fitting outer layer, and the expansion screws are evenly arranged on the baffle rings. And the baffle plate penetrates through the baffle ring and extends into the expansion chamber. By arranging the expansion screws and the reinforcing layer, the hot melting layer is uniformly extruded, so that the hot melting layer and the pipe are welded more tightly, gaps existing after the expansion screws are screwed can be filled through melting of the reinforcing layer, and the welding strength of the pipe and the electric melting pipe fitting is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric fusion pipe fittings, in particular to a double rubber ring PE composite sealing electric hot-melt pipe fitting. Background Art

[0002] Electric fusion fittings are plastic (polyethylene) pipe fittings that can be connected by melting through the temperature generated by electric current. With the development of various composite pipes based on polyethylene, most composite pipes on the market are currently connected using electric fusion fittings, because electric fusion fittings are less affected by the external environment and human factors, so they are more reliable.

[0003] For example, the utility model patent with patent number CN202023133551.5 discloses an assembled electric fusion pipe fitting, including: an electric fusion pipe body, an electrode column and a bushing, the bushing is concentrically arranged in the electric fusion pipe body, a resistance wire is spirally arranged on the outer circle of the bushing, and threaded sleeves located at both ends of the resistance wire are radially arranged on the outer circle of the bushing, and the electric fusion pipe body is provided with stepped holes corresponding to the threaded sleeves one by one, and the electrode column is arranged in the stepped hole and extends to the inner side of the electric fusion pipe body and is connected to the threaded sleeve. The electric fusion pipe body and the bushing adopt a split structure, and are injection molded separately, which is convenient for production. Then the resistance wire is wound around the outer circle of the bushing and welded and fixed with the threaded sleeve, and then the bushing is filled into the electric fusion pipe body to ensure concentricity, and finally the electrode column is screwed on, which improves the position accuracy and structural stability of the bushing, reduces the difficulty of production, is convenient for assembly, and has a high yield rate.

[0004] However, during the welding process, the electric fusion pipe fitting cannot form welding pressure with the pipe, resulting in welding gaps, a large clearance between the electric fusion pipe fitting and the pipe, and liquid leakage at the welding point between the electric fusion pipe fitting and the pipe, resulting in poor welding quality of the pipe. Utility Model Content

[0005] Based on this, the utility model provides a double rubber ring PE composite sealed electric hot-melt pipe fitting to solve the technical problems existing in the prior art, that is, the existing electric hot-melt pipe fittings cannot form a welding pressure with the pipe during the welding process, resulting in a welding gap, a large matching gap between the electric hot-melt pipe fittings and the pipe, resulting in liquid leakage at the welding point between the electric hot-melt pipe fittings and the pipe, and poor welding quality of the pipe.

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

[0007] A double rubber ring PE composite sealed electric hot-melt pipe fitting, comprising a pipe outer layer and a hot-melt layer, the hot-melt layer being sleeved inside the pipe outer layer, an electrode column being arranged on the pipe outer layer, a first resistance wire being arranged in an annular shape inside the hot-melt layer, the electrode column passing through the pipe outer layer and overlapping with the first resistance wire, further comprising a reinforcing layer, a retaining ring and a plurality of expansion screws, the reinforcing layer being arranged between the pipe outer layer and the hot-melt layer, an expansion chamber being reserved between the reinforcing layer and the pipe outer layer, a second resistance wire being arranged in an annular shape inside the reinforcing layer, the second resistance wire overlapping with the electrode column, the retaining rings being arranged at both ends of the pipe outer layer, a plurality of expansion screws being evenly arranged on the retaining rings, and extending through the retaining rings into the expansion chamber.

[0008] Preferably, it also includes a metal layer, which is arranged between the hot melt layer and the reinforcement layer, and a material discharge channel is arranged through the metal layer.

[0009] Preferably, the metal layer is one of cross-wound metal wires or threaded metal wires.

[0010] Preferably, it further comprises a glue layer, which is arranged between the reinforcement layer and the metal layer and glues the reinforcement layer and the metal layer together.

[0011] Preferably, a bayonet is provided on the electrode column, and a lap post is provided on the reinforcement layer. The lap post is connected to the second resistance wire, and the lap post can be moved downward and snapped into the bayonet.

[0012] Preferably, the bayonet is in the shape of a trapezoidal enlarged opening, and the enlarged opening of the bayonet is arranged corresponding to the overlapping column.

[0013] Preferably, it also includes a limiting ring, which is arranged on the inner wall of the hot melt layer.

[0014] Preferably, 8 groups of expansion screws are provided.

[0015] Compared with the prior art, the utility model has at least the following advantages:

[0016] By arranging a plurality of the expansion screws and the reinforcement layers, tightening the expansion screws from different directions, and evenly squeezing the hot-melt layer, the hot-melt layer and the pipe are more tightly fused. At the same time, after the reinforcement layer is melted, it can fill the virtual welding part and the unwelded part between the hot-melt layer and the pipe, thereby improving the fusion strength between the pipe and the electric fusion pipe fitting. Furthermore, the melting of the reinforcement layer can fill the gap existing after the expansion screw is tightened, thereby further improving the fusion strength between the pipe and the electric fusion pipe fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is an axonometric view of a double rubber ring PE composite sealed electric hot-melt pipe fitting.

[0018] Figure 2 It is a half-section view of a double rubber ring PE composite sealed electric hot-melt pipe fitting.

[0019] Figure 3 for Figure 2 A partial enlarged view of .

[0020] Figure 4 It is a partial cross-sectional view of a double rubber ring PE composite sealed electric hot-melt pipe fitting.

[0021] In the figure: the outer layer 100 of the pipe, the hot melt layer 200, the first resistance wire 210, the electrode column 300, the bayonet 310, the reinforcement layer 400, the second resistance wire 410, the overlapping column 420, the retaining ring 500, the expansion screw 600, the expansion chamber 610, the metal layer 700, the feeding channel 710, the glue layer 800, and the limit ring 900. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The technical solution of the present invention will be further described below in conjunction with the drawings of the embodiments of the present invention, and the present invention is not limited to the following specific implementation methods.

[0023] It should be understood that the same or similar numbers in the drawings of the embodiments correspond to the same or similar parts. In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom" and the like indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] Please see Figures 1 to 4A double rubber ring PE composite sealed electric hot-melt pipe fitting, comprising a pipe fitting outer layer 100 and a hot-melt layer 200, wherein the hot-melt layer 200 is sleeved inside the pipe fitting outer layer 100, an electrode column 300 is arranged on the pipe fitting outer layer 100, a first resistance wire 210 is arranged in a ring shape inside the hot-melt layer 200, the electrode column 300 passes through the pipe fitting outer layer 100 and overlaps with the first resistance wire 210, and further comprises a reinforcing layer 400, a retaining ring 500 and a plurality of expansion screws 600, wherein the reinforcing layer 400 is arranged An expansion chamber 610 is reserved between the outer layer 100 of the pipe and the hot melt layer 200, and between the reinforcement layer 400 and the outer layer 100 of the pipe. A second resistance wire 410 is arranged in a ring shape in the reinforcement layer 400. The second resistance wire 410 overlaps the electrode column 300. The retaining ring 500 is arranged at both ends of the outer layer 100 of the pipe. A plurality of expansion screws 600 are evenly arranged on the retaining ring 500 and extend through the retaining ring 500 to the expansion chamber 610.

[0025] The electric fusion pipe fitting is used in conjunction with an electric fusion welding machine. The hot melt layer 200 is an injection molding structure and is melted by high temperature. The retaining ring 500 has the function of limiting and fixing the hot melt layer 200 and the expansion screw 600, and also has a sealing function to prevent impurities from entering the expansion chamber 610. The hot melt layer 200 is a first welding rubber ring, and the reinforcing layer 400 is a second welding rubber ring. The hot melt layer 200 and the reinforcing layer 400 together form a double rubber ring to weld and seal the pipe.

[0026] In the specific use process, the ends of the two pipes are sleeved into the electric fusion pipe fitting, and the electric fusion welding machine is connected to the electrode column 300. After the electric fusion welding machine is powered on, the current is transmitted to the first resistance wire 210, and the first resistance wire 210 heats up and gradually melts the hot melt layer 200. At the same time, the second resistance wire 410 heats up after being powered on and gradually melts the reinforcement layer 400. During the welding process of the hot melt layer 200 and the reinforcement layer 400, the expansion screw 600 is gradually tightened, and the expansion screw 600 expands in the expansion chamber 610, which will squeeze the reinforcement layer 400. and the hot-melt layer 200, so that the gradually melted hot-melt layer 200 is closely attached to the surface of the pipe, and the expansion screw 600 is continuously and uniformly tightened from all directions of the retaining ring 500, so that the hot-melt layer 200 is evenly stressed, and the hot-melt layer 200 and the pipe are more tightly welded. At the same time, as the reinforcing layer 400 melts, the virtual welding part and the unwelded part between the hot-melt layer 200 and the pipe can be filled. Moreover, the melting of the reinforcing layer 400 can fill the gap existing after the expansion screw 600 is tightened; after welding, wait for the weld to cool down, and the welding is completed.

[0027] The effect achieved

[0028] By arranging a plurality of the expansion screws 600 and the reinforcement layer 400, tightening the expansion screws 600 from different directions, the hot-melt layer 200 is uniformly squeezed, so that the hot-melt layer 200 and the pipe are more tightly welded. At the same time, after the reinforcement layer 400 is melted, it can fill the virtual welding part and the unwelded part between the hot-melt layer 200 and the pipe, thereby improving the welding strength between the pipe and the electric fusion pipe fitting. Furthermore, the melting of the reinforcement layer 400 can fill the gap existing after the expansion screws 600 are tightened, thereby further improving the welding strength between the pipe and the electric fusion pipe fitting.

[0029] In one possible embodiment, see Figure 2 , Figure 3 , further comprising a metal layer 700, the metal layer 700 being arranged between the hot melt layer 200 and the reinforcing layer 400, and the metal layer 700 being penetrated by a feed channel 710. The metal layer 700 is evenly arranged between the hot melt layer 200 and the reinforcing layer 400, and when the reinforcing layer 400 is melted, the feed channel 710 passing through the metal layer 700 fills the virtual welding part and the unwelded part between the hot melt layer 200 and the pipe material, and after the reinforcing layer 400 is completely welded, it will be cooled and bonded with the metal layer 700, and the metal layer 700 can improve the pressure bearing strength of the electric fusion pipe fitting, and at the same time, the provision of the metal layer 700 can reduce the amount of injection molding used in the preparation process of the electric fusion pipe fitting and reduce the wall thickness of the electric fusion pipe fitting.

[0030] Specifically, the metal layer 700 is made of iron metal material or copper metal material.

[0031] In a preferred embodiment, the metal layer 700 is one of cross-wound metal wires or threaded metal wires. The cross-wound or threaded metal wires are evenly compressed and have high pressure-bearing strength. In the preparation process, the material discharge channel 710 naturally exists, and there is no need to open the material discharge channel 710 again.

[0032] In a possible embodiment, in order to prevent the reinforcement layer 400 and the metal layer 700 from being separated from each other, a glue layer 800 is further included. The glue layer 800 is arranged between the reinforcement layer 400 and the metal layer 700, and at the same time glues the reinforcement layer 400 and the metal layer 700 to make the reinforcement layer 400 and the metal layer 700 bonded more firmly, avoiding the reinforcement layer 400 and the metal layer 700 from being separated, resulting in uneven heating. When the reinforcement layer 400 is melted and cooled again, the reinforcement layer 400 will be bonded to the metal layer 700 without the need for bonding through the glue layer 800.

[0033] In a possible embodiment, the electrode column 300 is provided with a bayonet 310, and the reinforcing layer 400 is provided with a lap post 420, the lap post 420 is connected to the second resistance wire 410, and the lap post 420 can be moved down and snapped into the bayonet 310. In the first state (i.e. before welding), the lap post 420 and the bayonet 310 are separated from each other. Even after the electrode column 300 is powered on, since the lap post 420 and the bayonet 310 are separated from each other and not powered on each other, the reinforcing layer 400 will not melt, and only the hot melt layer 200 will melt; in the second state (i.e. starting welding), after the electrode column 300 is powered on, the hot melt layer 200 melts first and fuses with the pipe. After the preset welding time, the expansion screw 600 is rotated and tightened, and the expansion screw 600 squeezes the reinforcing layer 400, and the reinforcing layer 400 The lap column 420 moves downward, driving the lap column 420 to move into the bayonet 310, contacting the bayonet 310, and energizing the lap joint. The second heating wire in the reinforcing layer 400 heats up and melts the reinforcing layer 400 to achieve delayed welding. Since the reinforcing layer 400 is melted later, the reinforcing layer 400 has high strength, and the reinforcing layer 400 can be evenly squeezed against the hot melt layer 200. When a cold weld or an unwelded portion appears between the hot melt layer 200 and the pipe, the reinforcing layer 400 will be welded to the cold weld or the unwelded portion after melting, thereby improving the welding strength.

[0034] In a preferred embodiment, the bayonet 310 is in a trapezoidal enlarged opening shape, and the enlarged opening of the bayonet 310 is arranged corresponding to the lap post 420. Even if the lap post 420 and the bayonet 310 are slightly misaligned, the lap post 420 can be overlapped in the bayonet 310, preventing the misalignment and the phenomenon that the lap post 420 and the bayonet 310 cannot be overlapped.

[0035] In a possible embodiment, a limiting ring 900 is further included, and the limiting ring 900 is arranged on the inner wall of the hot melt layer 200. The two pipes to be welded are respectively inserted into the two ends of the electric fusion pipe fitting to the limiting ring 900, and the limiting ring 900 performs preliminary limiting and sealing for the two pipes. At the same time, as the hot melt layer 200 melts, the part of the limiting ring 900 in contact with the hot melt layer 200 melts, and the limiting ring 900 fills the connection between the two pipes to improve the sealing strength.

[0036] In a preferred embodiment, eight groups of expansion screws 600 are provided. The expansion screws 600 gradually squeeze the reinforcement layer 400 and the hot melt layer 200 from eight directions: top, bottom, left, right, upper left, lower left, upper right, and lower right, so that the hot melt layer 200 and the pipe are more tightly welded.

[0037] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double rubber ring PE composite sealed electric hot-melt pipe fitting, comprising a pipe fitting outer layer and a hot-melt layer, wherein the hot-melt layer is sleeved inside the pipe fitting outer layer, an electrode column is arranged on the pipe fitting outer layer, a first resistance wire is arranged in a ring shape inside the hot-melt layer, the electrode column passes through the pipe fitting outer layer and overlaps with the first resistance wire, characterized in that: It also includes a reinforcement layer, a retaining ring and a plurality of expansion screws. The reinforcement layer is arranged between the outer layer of the pipe and the hot melt layer. An expansion chamber is reserved between the reinforcement layer and the outer layer of the pipe. A second resistance wire is arranged in a ring shape in the reinforcement layer. The second resistance wire overlaps the electrode column. The retaining ring is arranged at both ends of the outer layer of the pipe. A plurality of expansion screws are evenly arranged on the retaining ring and extend through the retaining ring into the expansion chamber.

2. A double rubber ring PE composite sealing electric hot-melt pipe fitting as claimed in claim 1, characterized in that: It also includes a metal layer, which is arranged between the hot melt layer and the reinforcement layer, and a material discharge channel is arranged through the metal layer.

3. A double rubber ring PE composite sealing electric hot-melt pipe fitting as claimed in claim 2, characterized in that: The metal layer is one of cross-wound metal wires or threaded metal wires.

4. A double rubber ring PE composite sealing electric hot-melt pipe fitting as claimed in claim 2, characterized in that: The invention also comprises a glue layer, which is arranged between the reinforcement layer and the metal layer and glues the reinforcement layer and the metal layer together.

5. A double rubber ring PE composite sealing electric hot-melt pipe fitting as claimed in claim 1, characterized in that: The electrode column is provided with a bayonet, the reinforcement layer is provided with a lap post, the lap post is connected to the second resistance wire, and the lap post can be moved downward and snapped into the bayonet.

6. A double rubber ring PE composite sealing electric hot-melt pipe fitting as claimed in claim 5, characterized in that: The bayonet is in the shape of a trapezoidal enlarged opening, and the enlarged opening of the bayonet is arranged corresponding to the overlapping column.

7. A double rubber ring PE composite sealing electric hot-melt pipe fitting as claimed in claim 1, characterized in that: It also includes a limiting ring, which is arranged on the inner wall of the hot melt layer.

8. A double rubber ring PE composite sealing electric hot-melt pipe fitting as claimed in claim 1, characterized in that: The expansion screws are provided in 8 groups.

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