KR20070080244A - Electric fusion piping materials with screw pressing device - Google Patents

Abstract

A piping device for an electric fusion having a pressing structure of a screw thread is provided to increase the melting efficiency by fusing a melting part with a predetermined pressure and cooling the melting part. A piping device for an electric fusion having a pressing structure of a screw thread includes a melting part, a pressing member(200), a ring-type heating unit(300), and a screw coupling part(220). The heating unit heats and melts the melting part by being conducted. The pressing member rotates and directly/indirectly presses the ring-type heating unit when a temperature of the melting part reaches a softening point. The ring-type heating unit presses the melting part. The melting part is pressed by controlling a rotation of the screw coupling part. If the rotation of the screw coupling part is suspended, the pressed pressure to the melting part is kept regular.

Description

ELECTRIC FUSION PIPING MATERIALS WITH SCREW PRESSING DEVICE}

1 is a perspective view showing the main parts of the electrofusion piping apparatus and the synthetic resin pipe according to the first embodiment of the present invention separately;

Figure 2 is a cross-sectional view of the pipe connection of the electrofusion piping device of the electrofusion piping apparatus and the synthetic resin pipe in the state before the electrofusion in Figure 1,

3 to 5 is a cross-sectional view of the pipe connecting portion of the electrofusion piping device in the state before the electrofusion piping device and the synthetic resin pipe in the other embodiment according to the present invention;

6 to 7 illustrate a form in which the present invention is applied to a valve and a branch header, respectively, as an electrofusion pipe apparatus.

<Description of Symbols for Main Parts of Drawings>

10: piping device 20: synthetic resin pipe

100: pipe connection 110: step

120: connection thread

200: pressing member 210: pressing unit

220: screw connection

300: ring type heating element

400: electrical connection terminal

500: ring type weld

The present invention relates to an electrofusion piping apparatus for electric fusion to connect a synthetic resin pipe that is used for gas pipes, water pipes or other uses.

The present invention relates to a piping device for easy connection with other synthetic resin pipe, the connection method can be classified as electric fusion.

Since the electric fusion is mainly used for the connection of the joint pipe, the following will mainly describe the electric fusion of the joint pipe.

In order to achieve perfect airtightness in joining pipes made of materials such as polyethylene and polypropylene, which are used for gas pipes, water pipes, and other uses, heat fusion has been basically used.

Conventional heat fusion methods include butt fusion welding (Butt Fusion Welding), the general socket heat welding (Heat Fusion Socket Welding), and electronic socket fusion (Electro Fusion Socket Welding or Electric Fusion).

Butt fusion method is called butt fusion method, but it does not use a separate socket for connecting but the pipe end and the end face are melted and joined together, facing the end of the pipe to be joined to the clamp equipped with hydraulic or pneumatic The surface to be fixed seated and melt-bonded is smoothed, and then the heating plate is placed therebetween, and the pipe joint end face is press-fitted by hydraulic or pneumatic pressure to heat-melt to an appropriate melting temperature (e.g. around 210 ° C for polyethylene material). After that, the heating plate is quickly removed, and both end faces of the molten pipe are pressed and adhered to each other to maintain a predetermined time, and then cooled to solidify and join.

Therefore, this method melts and attaches the base metal when joining the pipes, and does not require a separate connection socket, but requires a heat welding machine that is heavy in weight and complicated in structure to be transported to the workplace.

Next, as a general connection socket, there is a method of melting and pasting the inner peripheral surface of the connecting socket and the outer peripheral surface of the pipe at the same time. In other words, the outer circumference of the pipe and the inner circumference of the connecting socket are simultaneously heated so that each surface melts at the same time, and when the heating is completed, the inner circumference of the connecting socket is quickly inserted into the outer circumference of the pipe, and the cooling is performed in this state. Keep it.

Next, as the electronic socket fusion, injection molding is integrally performed by inserting a heating element such as a heating coil into the connection socket. As a heating coil, copper wire, copper alloy wire, nichrome wire, etc. which hold electric resistance to some extent are used. Representative methods for manufacturing the electronic connection socket is a coil of the electrical resistance wire or electrical resistance wire coated with the thermoplastic resin in the form of a coil to connect the electrical connection terminal to the end and then injected into the injection mold Integrate. When the electrical connection socket manufactured in this manner is inserted into a pipe to be fused and then energized by a simple power supply for a predetermined time, the outer diameter surface of the pipe and the inner diameter surface of the electronic connection socket are simultaneously melted and joined.

Above and below, the electronic socket fusion is referred to as an electric fusion method.

This electrofusion method has been mainly used in the joint pipe.

Currently, the electric welding tube is favored by users because of its simplicity, and various technologies have been developed as a heating element of the electric welding tube.

On the other hand, in addition to the above technology, as a conventional technology integrated in the present specification, Korean Patent Publication No. 2002-0012809 "Electronic welding sheet of thermoplastic resin (polyethylene, polypropylene, etc.) pipe by a printed (coated) heating circuit" , Korean Unexamined Patent Publication No. 10-2004-0069622 "Fusing Bushing for Synthetic Resin Pipe Fusion", Korean Unexamined Patent Publication No. 10-2004-0096757 "Synthetic Resin Pipe Fusion Structure", Korean Unexamined Patent Publication No. 10-2005-0003231 Fusion structure of synthetic resin pipe using "

However, current electric fusion fittings have the following problems.

(1) In the case of joining by fusion, in order to obtain airtightness or watertightness, there should be no impurity on the surface to be melt-bonded, and if there is an impurity, the impurity acts as a kind of boundary layer, and the melts between the boundary layers are bonded to each other. This is a factor that lowers the joining efficiency. In view of this point, cleaning is performed on the surface to be melt-bonded before joining by fusion, but in the case of fine thin film impurities, complete cleaning is difficult.

(2) Bonding by fusion is basically an important factor in the operation of crimping in a state where proper pressure is applied (for example, in the case of the butt fusion method, the fusion site is press-bonded and bonded, In the case of electric fusion, the heating element is inserted into the inner circumferential surface of the joint pipe, so only the pressure due to natural expansion by melting can be used, and no artificial pressurization can be considered.

(3) In addition, in order to use the pressure due to natural expansion, the error between the inner circumferential surface of the electrofusion joint pipe and the outer circumferential surface of the synthetic resin pipe inserted therein should be small, and the production cost will be increased during precision processing.

The present invention, in order to solve the problems of the prior art as described above, by changing the rotational movement of the pressing member to a linear movement by the screw thread to press the heating element provided on the inner peripheral surface of the pipe connection portion of the piping device directly or indirectly, As a result, the molten part melted by the heating element is pressurized to obtain the pressure necessary for the fusion, as well as to provide a new electrofusion piping device that can increase the fusion efficiency by destroying the boundary layer due to impurities.

In order to solve the above problems, the present invention is a piping device for connecting to another synthetic resin pipe is made of synthetic resin, the piping device is a joint pipe, the connection thread for the screw thread is formed on the inner peripheral surface of the connection portion And a pressurizing member having an annular heating element for electric welding on the inner circumferential surface of the connecting portion, and a screwing portion screwed to the connecting thread and a pressurizing portion configured to pressurize the ring-shaped heating element by advancing according to rotation of the screwing portion. Characterized in that comprises a.

Hereinafter will be described in detail the configuration and operation according to the first embodiment of the present invention.

1 is a perspective view showing the main parts of the electrofusion pipe apparatus and the synthetic resin pipe separated according to the first embodiment of the present invention, Figure 2 is before the electrofusion piping device and the synthetic resin pipe in Figure 1 It is sectional drawing of the piping connection part of the electrofusion piping apparatus of a state.

The electrofusion piping device 10 shown in Figure 1 is a joint pipe.

The joint pipe 10 is used to connect two synthetic resin pipes 20.

Therefore, at least two pipe connection parts 100 are provided at the joint pipe 10, and another synthetic resin pipe 20 is connected to the pipe connection part 100. Of course, at least the pipe connection 100 in the joint pipe 10 should be made of synthetic resin.

The pipe connection part 100 forms an inner circumferential surface so that the synthetic resin pipe 20 can be inserted.

In addition, the stepped portion 110 is formed on the inner circumferential surface of the pipe connection part 100 so as to support one end of the synthetic resin pipe 20 to be inserted. Step 110 is for the synthetic resin tube is inserted into the appropriate depth so that the position can be determined.

The connection part thread 120 is formed in the outer peripheral surface adjacent to the edge part of the piping connection part 100. The connecting member thread 120 is screwed to the pressing member 200 to be described later.

Of course, the connection thread 120 may be formed on the inner circumferential surface of the pipe connection part 100 in some cases, and in some cases, the connection thread 120 may be spaced apart from the end of the pipe connection part 100.

On the other hand, the ring-shaped heating element 300 for electric fusion is provided on the inner peripheral surface of the pipe connection portion 100. The ring-shaped heating element 300 is connected to the electrical connection terminal 400, and when the external power is supplied through the electrical connection terminal 400, the ring-shaped heating element 300 is heated, when the ring-shaped heating element 300 is heated The periphery melts.

The ring-shaped heating element refers to all ring-shaped objects that generate heat through electricity. In this embodiment, conductive plastic is used as the heating element. However, in some embodiments, a metal heating element may be used.

Meanwhile, the pressure member 200 is screwed to the end of the pipe connecting portion 100.

The pressurizing member 200 is formed with a screw coupling part 220 having a female thread for screwing to an end of the pipe connecting part 100 on the outside, and the pressing member 200 has a pipe connection part 100 formed therein. The pressing portion 210 is inserted into the inner circumferential surface to press the ring-shaped heating element 300 directly or indirectly.

In addition, the pressing member 200 has a shape of a hexagon nut as a whole to facilitate the rotation operation of the pressing member 200.

Therefore, when the pressure member 200 is rotated, the pipe connection part 100 and the screw coupling part 220 screwed forward is rotated to move forward, the pressure member 200 formed integrally with the screw coupling part 220 at the same time Go forward.

The operation of the present embodiment will be described below.

As shown in FIG. 2, after arranging the electric fusion fitting pipe 10 and the synthetic resin pipe 20, when the electrical connection terminal 400 is connected to a power supply device (not shown) to conduct electricity for a predetermined time, The temperature of the periphery of the heat generating element 300 (ie, the inner circumferential surface of the pipe connecting portion 100 and the outer circumferential surface of the synthetic resin tube 20, etc., referred to as " melted portion ") is increased by the heat generation of the heat generating element 300. Is melted.

At this time, the inner circumferential surface of the pipe connection portion and the outer circumferential surface of the synthetic resin pipe reach the softening temperature through the glass transition temperature as the temperature increases.

As such, when the temperature of the melting part rises to reach the softening point, the pressing member 200 is rotated. As a result, the pressing member 200 advances and presses the ring-shaped heating element 300 directly or indirectly, thereby melting. The additional pressure is applied, the pressure at which the melted portion is pressed is adjusted according to the degree of rotation of the screw coupling portion 220, the pressurized pressure is kept constant when the rotation of the screw coupling portion 220 is stopped.

Thereafter, the molten part is melted under a predetermined pressure, and the inner circumferential surface of the pipe connection part around the heating element and the outer circumferential surface of the synthetic resin tube are fused.

According to the exemplary embodiment, after the temperature of the melting part is melted at a temperature below the softening point or higher, the pressing part 200 may be rotated to pressurize the melting part.

In this way, the bonded and cooled portions are pressed at a predetermined pressure at a high temperature, and the fusion efficiency is very excellent.

In addition, the boundary layer due to impurities at the fusion site (ie, the inner circumferential surface of the pipe connection portion or the outer circumferential surface of the synthetic resin pipe) of the melted portion is smashed by high temperature and shear force while the melt portion is pressed at a predetermined pressure, thereby preventing deterioration of the bonding performance due to the boundary layer of the impurities Can be.

Hereinafter, a second embodiment of the present invention will be described.

3 is a cross-sectional view of a pipe connecting portion of the electrofusion piping apparatus and the synthetic resin pipe of the second embodiment according to the present invention before the electrofusion welding apparatus.

In this embodiment, a pair of ring-shaped heating element 300 is provided as a heating element.

As described above, the pair of ring-shaped heating elements 300 generate heat by the power supplied from the electrical connection terminal 400.

In addition, between the pair of ring-shaped heating element 300 is provided with a ring-shaped welding rod 500 of the synthetic resin material for melting.

The ring-shaped weldment 500 is a synthetic resin material having a melting point lower than the melting point of the pipe connection part 100, and is melted, pressed, and cooled before the pipe connection part 100 according to the temperature rise of the heating element 300, and then cooled and the pipe connection part ( 100) and the synthetic resin tube 20 are closely fused.

Ring-shaped welding rod 500 is provided with a connection line 510 therein for electrical connection of the ring-shaped heating element 300 located on both sides.

The pair of ring-shaped heating element 300 and the ring-shaped weldment 500 provided therebetween may be manufactured separately or integrally.

Hereinafter, a third embodiment of the present invention will be described.

4 is a cross-sectional view of the pipe connecting portion of the electrofusion piping apparatus and the synthetic resin pipe of the third embodiment according to the present invention before the electrofusion welding apparatus.

In this embodiment, the connection part thread 120 is formed on the inner circumferential surface of the pipe connection part 100. Therefore, the screw connection part 220 of the pressure member 200 to be screwed to the connection part thread 120 is a pressure member ( It is formed in the outer peripheral surface of 200).

Hereinafter, a fourth embodiment of the present invention will be described.

5 is a cross-sectional view of a pipe connection of the electrofusion piping apparatus and the synthetic resin pipe of the fourth embodiment according to the present invention before the electrofusion welding apparatus.

In this embodiment, the electrical connection terminal is not provided in the piping device 10 itself.

That is, the electrical connection terminal hole 130 is formed in the piping connection part 100, and the electrical connection terminal (not shown) of the external power supply device is inserted into the electrical connection terminal hole 130, thereby providing the piping connection part 100. It is possible to supply electricity to the ring-shaped heating element 300 located on the inner circumferential surface of the).

On the other hand, the arrangement of the electrical connection terminal 400 or the hole for the electrical connection terminal 130 may be considered in various ways depending on the number of the heating element, and in the case of supplying electricity to the plurality of heating elements, the circuit configuration of the heating element in series or parallel Various structures can be proposed depending on the selection.

In addition, the electrical connection terminal or the hole for the electrical connection terminal may be provided in the pipe connecting portion or the pressing member, and in some cases may be provided between the pipe connecting portion and the pressing member, between the pressing member and the synthetic resin tube.

Although the above embodiments are described as being entirely separate from the heating element, the heating element itself may be assumed to melt.

For example, if the heating element is formed of a conductive plastic and power is supplied to the conductive plastic, the present technology can be applied not only to use the conductive plastic as a heating element but also to melt the conductive plastic itself and the synthetic resin in the vicinity thereof.

6 and 7 illustrate a configuration in which the electrofusion pipe apparatus of the present invention is applied to the valve 10 (see FIG. 6) and the branch header 10 (see FIG. 7).

Electrofusion valve 10 is provided in the pipe is used to open and close the flow of the fluid flowing through the pipe or to adjust the flow rate. Therefore, at least two or more pipe connection parts 100 are provided in the electrofusion pipe device 10, and another synthetic resin pipe 20 is connected to the pipe connection part 100. Of course, at least the pipe connection 100 in the piping device 10 for the electrical fusion should be made of synthetic resin.

The electrofusion branch header 10 is used to flow the fluid introduced into the inlet pipe, which is a kind of pipe connection part, into the plurality of outlet pipes, which is a kind of pipe connection part, in the pipe. The branch header 10 of FIG. 7 is a kind of a branch header for heating, and is provided with one inflow pipe through which heating water flows from a boiler or the like and a plurality of outflow pipes for sending heating water to a plurality of heating water use mechanisms. Therefore, at least two pipe connection parts 100 are provided in the branch header 10 for fusion, and another synthetic resin pipe 20 is connected to the pipe connection part 100. Of course, at least the pipe connection 100 in the branch header 10 for the electrical fusion should be made of synthetic resin.

In such a configuration, the connection structure of the pipe connection part 100 and the synthetic resin pipe 20 may be applied to the structures of FIGS. 2 to 5.

The above embodiments are merely preferred embodiments of the present invention, and the technical idea of the present invention may be variously modified or adjusted by those skilled in the art. Such modifications and adjustments fall within the scope of the present invention if they use the technical idea of the present invention.

As described above, the present invention, by changing the rotational movement of the pressing member screwed to the pipe connection portion of the electrofusion piping device in a linear motion by the screw thread to press the melted portion melted by the heating element on the inner peripheral surface of the pipe connection portion required for welding It provides a new electrofusion piping system that not only gains pressure but also breaks the boundary layer caused by impurities to increase the welding efficiency.

That is, the present invention is very excellent in joining efficiency because the joining site is fused and cooled while being pressed at a predetermined pressure at a high temperature.

In addition, the present invention can prevent the deterioration of the bonding performance due to the boundary layer of impurities while the boundary layer due to impurities at the fusion site is destroyed by the high temperature and shear force while the melting portion is pressed at a predetermined pressure.

As a result, the tolerance range of the outer diameter of the synthetic resin pipe and the inner diameter of the piping device can be widened, and the manufacturing cost of the synthetic resin pipe and the piping device can be reduced, thereby providing high quality electric welding economically.

Claims (8)

In the piping device made of synthetic resin pipe connecting portion for connecting with other synthetic resin pipe, The piping device is a joint pipe, Connection thread for screwing is formed on the inner circumferential surface of the connection portion, A ring-shaped heating element for electric fusion is provided on the inner circumferential surface of the connection portion, An electrofusion with a pressurized structure by means of a screw, characterized in that it comprises a screwing portion screwed to the connecting portion thread and a pressing portion formed to advance according to the rotation of the screwing portion to pressurize the ring-shaped heating element. Wear plumbing. The method of claim 1, The heating element is an electrofusion piping device having a pressurized structure by the thread, characterized in that made of a conductive plastic. The method according to claim 1 or 2, An electrical connection terminal for supplying electricity to the heating element is an electrical fusion piping device having a pressurized structure by the thread, characterized in that provided in the connecting portion or the pressing member. In accordance with claim 1 or 2, And a connection hole or a pressurizing member is provided with a hole for an electrical connection terminal for supplying electricity to the heating element. The method according to claim 1 or 2, An electrofusion piping apparatus having a pressurized structure by a screw thread, characterized in that a ring-shaped weldment is provided adjacent to the ring-shaped heating element. The method of claim 5, The ring-shaped welding electrode is an electrofusion piping device having a pressurized structure by the thread, characterized in that provided between the pressing portion and the ring-shaped heating element. The method of claim 5, The ring-type heating element is provided in plural, the ring-shaped welding ribs are electro-fusion piping device having a pressurized structure by the thread, characterized in that provided between the ring-shaped heating element. The method of claim 5, And the ring-shaped heating element and the ring-shaped weld meat are integrally provided with each other.

Images