KR101017986B1 - Electric fusion piping materials with conductive plastic cylinder - Google Patents

Abstract

The present invention provides a piping device in which a pipe connecting portion for inserting another synthetic resin pipe is made of synthetic resin: a cylinder type made of a conductive plastic material provided between an inner circumferential surface of the pipe connecting portion and the synthetic resin pipe and generating heat by electricity supply. Conductive plastic cylinder; It is provided between the conductive plastic cylinder and the synthetic resin tube in order to be fused to the synthetic resin tube by the heat generated by the conductive plastic cylinder, and the auxiliary fusion for the cylindrical shape to form a surface contact state with the conductive plastic cylinder and the synthetic resin tube, respectively cylinder ; An electrical connection terminal arranged along the axial direction of the conductive plastic cylinder to supply electricity to the conductive plastic cylinder, the electrical connection terminal being in line contact with the conductive plastic cylinder; Characterized in that comprises a.

Description

ELECTRIC FUSION PIPING MATERIALS WITH CONDUCTIVE PLASTIC CYLINDER}

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 description will focus on the electric fusion of the joint pipe.

In order to achieve perfect airtightness in joining pipes made of a material such as polyethylene or polypropylene, which is used for gas pipes, water pipes, and other applications, 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).

The butt fusion method is a butt fusion method, but the surface of a pipe to be joined to a clamp equipped with hydraulic or pneumatic pressure is welded by melting the surface by joining the cross section of the pipe and the cross section of another pipe without using a separate connection socket. Face the surface to be fixed seated and smoothed the surface to be melt-bonded, and then press-fit the pipe joint end face by hydraulic or pneumatic with the heating plate in between, to a suitable melt temperature (e.g. around 210 ° C for polyethylene material). After heating and melting, the heating plate is quickly removed, and both end surfaces of the molten pipe are pressed and held in close contact with 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 it is necessary to heat the welder, which is heavy in weight and complicated in structure to transport to the work site.

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 such an electronic connection socket is winding an electric resistance wire or an electric resistance wire spiral coated with a thermoplastic resin in the form of a coil, connecting the electrical connection terminal to the end, and inserting it in an injection mold. Manufacture a socket for connection provided with an electric resistance wire integrally. 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 "

On the other hand, PCT / KR2007 / 000540 "ELECTRIC FUSION PIPING MATERIALS WITH SCREW PRESSING DEVICE" has been proposed by the applicant. According to the related art, a pipe connecting portion for connecting with another synthetic resin pipe is made of synthetic resin, and a connection thread for screwing is formed on a main surface of the connection part, and a ring-type heating element for electric fusion is formed on an inner circumferential surface of the connection part. It is provided, characterized in that it comprises a screw engaging portion screwed to the connecting portion screw thread and the pressing member is formed to be advanced in accordance with the rotation of the screw coupling portion to press the ring-shaped heating element is formed. The above technique illustrates, in particular, the use of conductive plastics as ring-shaped heating elements.

As described above, it was found that the following points need to be improved in the process of continuously developing the applicant's technology using the conductive plastic as a heating element.

1) Although the above technique uses the pressing force by the pressing member, it is cumbersome to pressurize the pressing member every time the electric welding is performed at the work site, and if the worker misses it, quality defects may occur. have.

2) Since the conductive plastic is a kind of synthetic resin different from the general synthetic resin tube, the fusion efficiency between the conductive plastic and the synthetic resin tube is not so high. Of course, the above prior art uses the pressing force by the pressing member due to this point.

3) In case of supplying electricity while the electrical connection terminal is in contact with the conductive plastic in point contact state, the conductive plastic forms a heating line appearing in the form of a line between the two electrical connection terminals, and as a result, it is impossible to obtain an uniform fusion structure. In addition, when the material of the conductive plastic does not form a completely uniform state as a whole, there is a part where the resistance change is extremely changed in the heating line, so that smooth electric fusion is difficult.

Therefore, the present invention has been proposed to improve such a problem, and improved the conductive plastic in the form of a cylinder so that a surface-shaped fusion structure can be formed to have excellent electric welding efficiency without a separate pressing member.

In addition, the present invention is not a conductive plastic is directly fused in contact with the synthetic resin tube, the cylinder-shaped conductive plastic by melting the auxiliary auxiliary fusion cylinder in the form of a cylinder so that the secondary fusion cylinder and the synthetic resin tube is fused to each other to improve the fusion efficiency It was.

In addition, the present invention is to supply electricity while the electrical connection terminal in contact with the conductive plastic cylinder in a line contact state in order to supply electricity to the conductive plastic in the form of a cylinder so that the conductive plastic generates heat in the form of a surface, to obtain a uniform fusion structure Not only can it lead to a stable resistance change of the conductive plastic, which improves the welding efficiency and also facilitates the welding operation.

In order to solve the above problems, the present invention, the pipe connecting portion for inserting the other synthetic resin pipe in the piping device made of synthetic resin: provided between the inner peripheral surface of the pipe connecting portion and the synthetic resin pipe, the heat generated by electricity supply Conductive plastic cylinders in the form of cylinders made of plastics; It is provided between the conductive plastic cylinder and the synthetic resin tube in order to be fused to the synthetic resin tube by the heat generated by the conductive plastic cylinder, and the auxiliary fusion for the cylindrical shape to form a surface contact state with the conductive plastic cylinder and the synthetic resin tube, respectively cylinder ; An electrical connection terminal arranged along the axial direction of the conductive plastic cylinder to supply electricity to the conductive plastic cylinder, the electrical connection terminal being in line contact with the conductive plastic cylinder; Characterized in that comprises a.

In the above, the outer peripheral surface of the conductive plastic cylinder is formed along the axial direction of the conductive plastic cylinder, the electrical connection terminal groove is formed in the electrical connection terminal groove is in contact with the conductive plastic cylinder It is preferable.

In the above, it is preferable that the depth of the grooves for the electrical connection terminals is 1/2 or more of the thickness of the electrical connection terminals.

In the above, the electrical connection terminal may be embedded in the conductive plastic cylinder along the axial direction of the conductive plastic cylinder in order to contact the conductive plastic cylinder.

According to another aspect of the present invention, a pipe connecting portion for inserting another synthetic resin pipe is made of synthetic resin: provided between the inner peripheral surface of the pipe connecting portion and the synthetic resin pipe, made of a conductive plastic material that is heated by electricity supply Conductive plastic cylinders in cylinder form; It is provided between the conductive plastic cylinder and the synthetic resin tube in order to be fused to the synthetic resin tube by the heat generated by the conductive plastic cylinder, and the auxiliary fusion for the cylindrical shape to form a surface contact state with the conductive plastic cylinder and the synthetic resin tube, respectively cylinder ; And an external electrical connection terminal for supplying electricity to the conductive plastic cylinder is inserted into the electrical connection along the axial direction of the conductive plastic cylinder to the pipe connection to be in line contact with the outer circumferential surface of the conductive plastic cylinder. Characterized in that the slot for the terminal is formed.

In the above, the groove for the electrical connection terminal is formed in the outer peripheral surface of the conductive plastic cylinder along the axial direction of the conductive plastic cylinder, the groove for the electrical connection terminal is preferably formed in the same direction as the slot for the electrical connection terminal. Do.

In the above two ideas, the auxiliary fusion cylinder may be formed integrally with the pipe connection.

In the above two ideas, the auxiliary fusion cylinder may be formed integrally with the conductive plastic cylinder.

In the above two ideas, it is preferable that the pipe support part in the form of a cylinder for supporting the inner circumferential surface of the synthetic resin pipe is formed integrally with the pipe connection part.

As mentioned above, this invention can provide the piping apparatus for electric fusion which does not need a separate pressurization structure. In particular, the present invention does not require a pressurized structure, since the auxiliary fusion cylinder is expanded in volume during the temperature rise process, the pressure naturally rises according to the volume expansion, so that it can be used as the pressure at the time of fusion, even without a separate pressurized structure. Excellent welding quality.

In addition, the present invention is fusion efficiency is improved by the secondary welding cylinder and the synthetic resin pipe fusion in the surface contact state with each other, and the conductive plastic cylinder can also be improved by fusion welding with the peripheral member.

In addition, the present invention can not only obtain a surface-shaped fusion structure through the heat generation of the surface of the conductive plastic by supplying electricity to the conductive plastic cylinder in the line contact state, the material of the conductive plastic cylinder is completely uniform In the absence of a state, that is, even when there is a state of a material that is partially uneven, the change of resistance caused by the portion is only a small part of the heat generation of the entire surface, and thus does not interfere with the electric welding operation.

DETAILED DESCRIPTION Hereinafter, embodiments according to the present invention will be described, and the same reference numerals in each drawing should be understood as having the same function unless otherwise noted.

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

1 is a perspective view showing the main parts of the electric fusion piping device and the synthetic resin pipe separated according to the first embodiment of the present invention, Figure 2 is a perspective view of the combined state of Figure 1, Figure 3 is in Figure 2 Sectional drawing of the pipe connection part of the electrofusion piping apparatus of the state before electrofusion piping apparatus and the synthetic resin pipe were electrofused.

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, the joint pipe 10 is provided with at least two pipe connection parts 100, the other synthetic resin pipe 20 is inserted into the pipe connection part 100 is connected. 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.

An auxiliary fusion cylinder 110 is integrally formed in the pipe connection part 100, and a pipe support part 120 is integrally formed in the pipe connection part 100.

One end of the synthetic resin tube 20 is inserted between the auxiliary fusion cylinder 110 and the tube support part 120.

The auxiliary fusion cylinder 110 is a portion fused with the synthetic resin tube 20 by the heat of the conductive plastic cylinder 300 later.

The pipe support part 120 is for supporting the inner circumferential surface of the synthetic resin pipe 20 and has a cylindrical shape.

A conductive plastic cylinder 300 in the form of a cylinder is provided on the outer circumferential surface of the auxiliary fusion cylinder 110.

The conductive plastic cylinder 300 is made of a conductive plastic material that is heated by electricity supply.

Therefore, the auxiliary fusion cylinder 110 is provided between the conductive plastic cylinder 300 and the synthetic resin tube 20, the outer peripheral surface is in contact with the conductive plastic cylinder 300, the inner peripheral surface of the synthetic resin tube 20 and The surface contact state is achieved.

An electrical connection terminal 400 is disposed along the axial direction of the conductive plastic cylinder 300 on the outer circumferential surface of the conductive plastic cylinder 300 to make a line contact with the outer circumferential surface of the conductive plastic cylinder 300.

The length of the outer circumferential surface of the conductive plastic cylinder 300 and the electrical connection terminal 400 in line contact with each other is preferably 95% or more of the length of the conductive plastic cylinder 300. This is to allow the conductive plastic cylinder 300 to be uniformly heated.

The electrical connection terminal 400 is for supplying electricity to the conductive plastic cylinder (300). In addition, two electrical connection terminals 400 are provided, and thus the two electrical connection terminals 400 are disposed at 180 ° intervals along the outer circumferential surface of the conductive plastic cylinder 300 to face each other.

Accordingly, when external power is supplied through the electrical connection terminal 400, the conductive plastic cylinder 300 generates heat. When the conductive plastic cylinder 300 generates heat, the auxiliary fusion cylinder 110 is heated by the heat to the synthetic resin tube 20. ) Will be fused. Of course, the conductive plastic cylinder 300 is also melted and fused with the surrounding ones, in particular, the auxiliary fusion cylinder 110.

Meanwhile, the electrical connection terminal 400 has an L shape so that a part of the electrical connection terminal 400 may protrude to the outside of the pipe connection 100, and the electrical connection terminal having a T shape is provided at the pipe connection 100. The groove 130 is formed. Therefore, a part of the electrical connection terminal 400 penetrates through the groove for the electrical connection terminal 130 and protrudes to the outside of the pipe connection portion 100 so that it is possible to easily supply electricity to the electrical connection terminal 400 from the outside. Of course, the shape of the electrical connection terminal groove 130 may be variously modified according to the embodiment.

On the other hand, the method of exposing the electrical connection terminal 400 to the outside of the pipe connection 100 may be considered in various ways, this embodiment is only one example.

A fixing stopper 200 is coupled to the end of the pipe connection part 100, and the fixing stopper 200 fixes the conductive plastic cylinder 300 provided inside the pipe connection part 100. As shown, the pipe connecting portion 100 and the fixing stopper 200 are fastened to each other by screwing. For this purpose, a male thread is formed on the outer circumferential surface of the pipe connecting portion 100, and the inner peripheral surface of the fixing stopper 200 is formed. Female thread acid is formed.

The operation of the present embodiment will be described below.

As shown in FIG. 3, 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 conductive plastic cylinder 300 is heated, the peripheral portion of the heating element 300, especially the auxiliary fusion cylinder 110 by the heat of the conductive plastic cylinder 300 rises while the auxiliary fusion cylinder 110 is a synthetic resin pipe It is fused to 20.

At this time, the conductive plastic cylinder 300, since the electrical connection terminal 400 supplies electricity in a line contact state along the axial direction of the conductive plastic cylinder 300, the entire conductive plastic cylinder 300 is evenly generated, Since the entire conductive plastic cylinder 300 acts as a resistance, the resistance change is stable.

In addition, the conductive plastic cylinder 300 to the auxiliary fusion cylinder 110 are all in the form of a cylinder, the thickness of which is thin and the length is long form the conductive plastic cylinder 300 to the secondary fusion cylinder 110 according to the rise in temperature Volume expansion is used at the pressure required during the fusion process.

In addition, the pipe support part 120 prevents the synthetic resin pipe 20 from being pushed toward the center side by the expansion of the conductive plastic cylinder 300 and the auxiliary fusion cylinder 110 during the electric fusion process so that the pressure at the time of fusion can be achieved at high pressure. Assist.

In addition, the fusion structure of the synthetic resin tube 20 and the secondary fusion cylinder 110 fused in this way is excellent in fusion performance because it forms a fusion structure of the surface form.

4 and 5 are modifications of the first embodiment, only the coupling structure of the pipe connecting portion 100 and the fixing stopper 200 is different, the remaining parts are the same as the first embodiment.

In FIGS. 4 and 5, grooves are formed on the outer circumferential surface (FIG. 4) or the inner circumferential surface (FIG. 5) of the pipe connection part 100, and the fixing stopper 200 is formed to form a protrusion coupled to the groove. ) Is coupled to the pipe connection 100 to the fixing stopper 200 to fix the conductive plastic cylinder (300).

6 and 7 show another modification of the first embodiment.

In FIG. 1, the auxiliary fusion cylinder was formed integrally with the pipe connection part 100, but in this embodiment, the auxiliary fusion cylinder 310 is integrally formed with the conductive plastic cylinder 300.

Of course, even in this case, the auxiliary fusion cylinder 310 and the conductive plastic cylinder 300 are different kinds of synthetic resins, and the auxiliary fusion cylinder 310 is made of a synthetic resin material for fusion with the synthetic resin tube 20.

In some cases, the auxiliary fusion cylinder 310 and the conductive plastic cylinder 300 may be manufactured and assembled as separate components, but after manufacturing the conductive plastic cylinder 300 to reduce the assembly process, the conductive plastic cylinder 300 It is preferable to manufacture by injecting the auxiliary fusion cylinder 310 integrally).

6 and 7 are the same technology except for the shape of the fixing stopper 200, in particular in Figure 7 protrusions for coupling to the groove formed on the inner peripheral surface of the pipe connection portion 100 to the auxiliary fusion cylinder 310 itself Is formed. Therefore, in FIG. 7, the auxiliary fusion cylinder 310 also serves as a fixing stopper.

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

FIG. 8 is a perspective view illustrating the main parts of the electric welding pipe apparatus and the synthetic resin pipe separated according to the second embodiment of the present invention, and FIG. 9 is a view showing the electric welding pipe apparatus and the synthetic resin pipe before the electric welding in FIG. 8. It is sectional drawing of the piping connection part of the electrofusion piping apparatus of a state.

The electrical connection terminal 400 is not provided in the electrical fusion piping device 10 of the present embodiment, but the electrical connection terminal slot 140 is formed in the pipe connection portion 100.

Electrical connection terminal slot 140 is formed along the axial direction of the conductive plastic cylinder 300 in the pipe connection portion 100, the external electrical connection terminal 30 is inserted through the electrical connection terminal slot 140 To achieve a line contact state with the outer peripheral surface of the conductive plastic cylinder (300).

That is, in order to supply electricity to the conductive plastic cylinder 300, as shown in the first embodiment, the electrical connection terminal 400 may be directly provided in the electric fusion piping device 10, but the electrical connection as in this embodiment The terminal 140 is formed so that an external electrical connection terminal connected to an external power supply device may be inserted into the electrical connection terminal slot 140 of the piping device to supply electricity to the conductive plastic cylinder 300. .

10 is another modification of FIG. 9.

In this embodiment, the protrusion 301 is formed along the axial direction on the outer circumferential surface of the conductive plastic cylinder 300. This is to prevent the melt pressure from being lowered as the conductive plastic cylinder 300 is melted at the time of electric fusion while the melt is partially escaped through the slot 140 for the electrical connection terminal.

11 to 14 show yet another modification of FIG. 9.

15 and 16 illustrate a form in which an electrofusion pipe apparatus of the present invention is applied to a valve 10 (see FIG. 15) and a branch header 10 (see FIG. 16).

Electrofusion valve 10 is provided in the pipe is used to open and close the flow of 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. 16 is a kind of a branch header for heating, and is provided with one inflow pipe into 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 or more pipe connection parts 100 are provided at 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 the above-described embodiments.

Meanwhile, in the above embodiments, the conductive plastic cylinder 300 has been described with reference to being assembled to the electrofusion piping device 10, but this is only an example. That is, the conductive plastic cylinder 300 may be integrally provided in the pipe apparatus 10 for electric fusion by a method such as double injection. Of course, even in this case, the conductive plastic cylinder 300 and the electrofusion piping device 10 are different materials. As such, when the conductive plastic cylinder 300 is integrally provided with the electrofusion pipe apparatus 10, a fixing stopper is unnecessary.

By the above embodiments, a general structure of the pipe connection part 100, the auxiliary fusion cylinder 110, the conductive plastic cylinder 300, and the electrical connection terminal 400 has been described.

Hereinafter, an improved contact structure of the conductive plastic cylinder 300 and the electrical connection terminal 400 will be described.

FIG. 17 is a view corresponding to FIG. 3, and is a perspective view and a cross-sectional view for showing a contact state between the conductive plastic cylinder 300 and the electrical connection terminal 400.

FIG. 18 is a view corresponding to FIG. 9, and is a perspective view and a cross-sectional view for showing a state in which the conductive plastic cylinder 300 and the external electrical connection terminal 30 are in contact with each other.

In FIG. 17 and FIG. 18, other components such as the pipe connection part 100 and the auxiliary fusion cylinder 110 are omitted.

When the conductive plastic cylinder 300 generates heat through the electrical connection terminal 400 or the external electrical connection terminal 30 in the state of FIGS. 17 and 18, the auxiliary fusion cylinder 110 is fused to the synthetic resin tube 20. .

At this time, the time (fusion time) until the auxiliary fusion cylinder 110 is fused to the synthetic resin tube 20 depends on the power applied to the conductive plastic cylinder 300.

In other words, the product of the power and the fusion time is the amount of power, the amount of power is generally proportional to the total amount of heat generated in the conductive plastic cylinder 300, the total amount of heat required to complete the fusion is the power of the fusion time Can be understood as a product.

In addition, the total amount of heat required for welding one auxiliary welding cylinder 110 can be understood as a fixed constant.

Accordingly, if the power supplied to the conductive plastic cylinder 300 is increased, the fusion time will be shortened. If the power supplied to the conductive plastic cylinder is lowered, the fusion time will be long.

Based on this understanding, the present inventors attempted to increase the power supply per unit time in order to reduce the welding time after confirming that the welding was successful by performing electric welding in the state of FIGS. 17 and 18 at low power. Reducing the welding time by increasing the power supply per unit time means that the time required for welding operation can be reduced.

However, according to the experiments of the present inventors, a phenomenon in which the conductive plastic cylinder 300 partially burns out when the power supply per unit time is increased, and this problem occurs very rapidly, has been found that it cannot be properly adjusted.

Therefore, the present inventors could confirm that the maximum power supply amount is limited depending on the diameter or length of the conductive plastic cylinder 300.

For example, when using a 15mm long conductive plastic cylinder 300 to connect the synthetic resin pipe of 16mm diameter, the supply power was confirmed that the limit is about 80W (watt).

Of course, the limit of the power supply may vary slightly depending on the material or size of the conductive plastic cylinder 300, but in any case if the conductive plastic cylinder 300 is partially burned out before the welding is completed if the excessively high power is supplied Was confirmed.

The present inventors have found out why such a problem occurs in order to solve such a problem, and also propose an improvement according to the following.

17 and 18, the portion heated by the conductive plastic cylinder 300 is not limited to the auxiliary fusion cylinder 110, and the pipe connection portion 100 located outside the conductive plastic cylinder 300 is also heated to melt. Done.

However, when the pipe connection part 100 located outside the conductive plastic cylinder 300 is heated in the state of FIGS. 17 and 18, a part of the pipe connection part 100 melts to increase fluidity and expand. In particular, since the pipe connection part 100 is a general synthetic resin material, it shows much higher fluidity than the conductive plastic cylinder 300 when heated, and its expandability is also high.

Therefore, a portion of the pipe connection part 100 having high fluidity is penetrated into a portion where the electrical connection terminal 400 and the conductive plastic cylinder 300 are in contact with each other. As a result, the conductive plastic cylinder 300 and the electrical connection terminal 400 are confined. The poor contact part occurs in the connection part between the parts.

That is, as the heat generated by the conductive plastic cylinder 300, the molten pipe connecting part 100 of high expansion partially penetrates into the contact portion between the electrical connection terminal 400 and the conductive plastic cylinder 300, the electrical connection terminal The contact between the 400 and the conductive plastic cylinder 300 is to be changed to a bad state.

Of course, in FIG. 18, as the heating of the conductive plastic cylinder 300 occurs, the contact between the external electrical connection terminal 30 and the conductive plastic cylinder 300 is partially changed to a bad state.

Such partial contact failure is accompanied by a partial extreme rise in resistance, and when a constant power is supplied to the electrical connection terminal 400 (or an external electrical connection terminal 30) in which the extreme resistance rise occurs, The flow is concentrated to a portion of low resistance, that is, a good contact between the electrical connection terminal (or external electrical connection terminal 30) and the conductive plastic cylinder 300, causing local overheating, so that the conductive plastic cylinder 300, which is a heating element, Burning is a problem.

Therefore, the power supplied to the conductive plastic cylinder 300 in the state of FIGS. 17 and 18 should be supplied so low that such a problem does not occur.

However, supplying low power due to these problems results in a significant increase in the welding time.

Therefore, in order to solve this problem, a design is required to prevent the molten pipe connection 100 from penetrating the contact portion between the conductive plastic cylinder 300 and the electrical connection terminal 400.

For this purpose, the inventors have found that this problem can be solved by forming the grooves 302 for the electrical connection terminals on the outer circumferential surface of the conductive plastic cylinder 300 as shown in FIGS. 19 and 20.

That is, the grooves 302 for the electrical connection terminals are formed on the outer circumferential surface of the conductive plastic cylinder 300 along the axial direction, and the electrical connection terminals 400 are seated in the grooves 302 for the electrical connection terminals. Contact with 300 will solve the above problems.

The advantage of such an electrical connection terminal groove 302 is that it can greatly increase the contact area of the electrical connection terminal 400 and the conductive plastic cylinder 300 first. That is, in the cross-sectional view of FIG. 17, the conductive plastic cylinder 300 is in contact with the conductive plastic cylinder 300 at a lower point of the electrical connection terminal 400, whereas in the cross-sectional view of FIG. 19, at least half of the main surface of the electrical connection terminal 400 is contacted. In contact with the conductive plastic cylinder (300).

In addition, as shown in FIG. 19, when the depth t2 of the electrical connection terminal groove 302 is formed to be 1/2 or more of the thickness t1 of the electrical connection terminal 400, the conductive plastic cylinder 300 may be formed. Even when the pipe connection part 100 located on the outside is melted and expanded, the expanded pipe connection part 100 pushes the electric connection terminal 400 to the conductive plastic cylinder 300 to thereby expand the electric connection terminal 400 and the conductive plastic. There is no risk that the pipe connection 100 penetrates between the cylinders 300, and the pipe connection part 100 that is melted and expanded serves to further improve the contact between the electrical connection terminal 400 and the conductive plastic cylinder 300. Will be done.

By this structure, the present inventors confirmed that when using the conductive plastic cylinder 300 of 15mm length in order to connect the synthetic resin tube of the 16mm diameter described above, the supply power can reach about 300W (watt). It was.

This is almost four times the power supply compared to the structure of FIG. 17, considering that the limit of the supply power is about 80W for the structure of FIG. 17, and as a result, about 1 / The welding operation can be completed in 4 hours. For example, if a fusion time of 40 seconds is required in the structure of FIG. 17, only a fusion time of about 10 seconds is required in the structure of FIG. 19.

FIG. 20 is the same as in FIG. 19 except that an external electrical connection terminal 30 is used instead of the electrical connection terminal 400.

Of course, the groove 302 for the electrical connection terminal in Figure 20 is formed in the same direction as the slot for the electrical connection terminal 140, the external electrical connection terminal 30 passing through the electrical connection terminal slot 140 is electrically connected It should be able to be seated in the groove 302 for the terminal.

21 is an improvement example of FIG. 19, in which a groove 302 for an electrical connection terminal encloses most of the electrical connection terminal 400.

22 is a variation of FIG. 19, in which the electrical connection terminal 400 is embedded in the conductive plastic cylinder 300 along the axial direction of the conductive plastic cylinder 300.

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.

The present invention can be applied to an electrofusion piping device for connecting a synthetic resin pipe used for a gas pipe, a water pipe, or other uses, specifically, a joint pipe, a valve, a branch header, and the like.

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

FIG. 2 is a perspective view of the state in which FIG. 1 is coupled;

3 is a cross-sectional view of the pipe connection of the electrofusion piping device and the electrofusion welding device in the state before the electrofusion welding pipe in Figure 2;

4 to 7 is a modification of FIG.

8 is a perspective view showing the main parts of the electrofusion pipe apparatus and the synthetic resin pipe separated according to the second embodiment of the present invention;

9 is a cross-sectional view of the pipe connection of the electrofusion piping device and the electrofusion welding pipe apparatus of the state before the electrofusion welding pipe in Figure 8;

10 to 14 is a modification of the Figure 9,

15 and 16 is a view showing a form in which the electrofusion piping device of the present invention is applied to the valve and the branch header,

17 is a view corresponding to FIG. 3, a perspective view and a cross-sectional view for showing a contact state between a conductive plastic cylinder and an electrical connection terminal;

18 is a view corresponding to FIG. 9, a perspective view and a cross-sectional view for showing a state in which a conductive plastic cylinder is in contact with an external electrical connection terminal;

19, 21, 22 is a view of improving the contact structure between the conductive plastic cylinder and the electrical connection terminal for Figure 17,

20 is a view illustrating an improved contact structure between a conductive plastic cylinder and an external electrical connection terminal of FIG. 18.

<Description of Symbols for Main Parts of Drawings>

10: electric fusion piping device 20: synthetic resin pipe

30: External electrical connection terminal

100: pipe connection 110: auxiliary welding cylinder

120: tube support 130: groove for the electrical connection terminal

140: slot for electrical connection terminal

200: fixing stopper

300: conductive plastic cylinder 301: protrusion

302: groove for electric connection terminal

310: auxiliary welding cylinder

400: electrical connection terminal

Claims (9)

A piping device for inserting another synthetic resin pipe, the piping device comprising a synthetic resin: A conductive plastic cylinder in the form of a cylinder made of a conductive plastic material is provided between the inner circumferential surface of the pipe connecting portion and the synthetic resin tube, and generated by electricity supply; It is provided between the conductive plastic cylinder and the synthetic resin tube in order to be fused to the synthetic resin tube by the heat of the conductive plastic cylinder, the outer peripheral surface to form a surface contact state with the conductive plastic cylinder and the inner peripheral surface to form a surface contact state with the synthetic resin tube Auxiliary welding cylinder in the form of a cylinder; An electrical connection terminal arranged along the axial direction of the conductive plastic cylinder to supply electricity to the conductive plastic cylinder, the electrical connection terminal being in line contact with the conductive plastic cylinder; And, A groove for an electrical connection terminal is formed on an outer circumferential surface of the conductive plastic cylinder along an axial direction of the conductive plastic cylinder, and the electrical connection terminal is seated in the groove for the electrical connection terminal to contact the conductive plastic cylinder. The depth of the groove for the electrical connection terminal is an electrical fusion piping device using a conductive plastic cylinder, characterized in that more than 1/2 of the thickness of the electrical connection terminal. A piping device for inserting another synthetic resin pipe, the piping device comprising a synthetic resin: A conductive plastic cylinder in the form of a cylinder made of a conductive plastic material is provided between the inner circumferential surface of the pipe connecting portion and the synthetic resin tube, and generated by electricity supply; It is provided between the conductive plastic cylinder and the synthetic resin tube in order to be fused to the synthetic resin tube by the heat of the conductive plastic cylinder, the outer peripheral surface to form a surface contact state with the conductive plastic cylinder and the inner peripheral surface to form a surface contact state with the synthetic resin tube Auxiliary welding cylinder in the form of a cylinder; An electrical connection terminal arranged along the axial direction of the conductive plastic cylinder to supply electricity to the conductive plastic cylinder, the electrical connection terminal being in line contact with the conductive plastic cylinder; And, And the electrical connection terminal is embedded in the conductive plastic cylinder along the axial direction of the conductive plastic cylinder so as to contact the conductive plastic cylinder. delete delete delete delete delete delete delete

Images