KR100912672B1 - Electro-fusion connecting sheet for connecting plastic pipes - Google Patents

Abstract

An electro-fusion connecting sheet for connecting synthetic resin pipes is provided to prevent overheating of the heating element and wall subsidence and fluid leakage due to overheating by inserting long heating members to the outer side of the thermoplastic synthetic resin sheet. An electro-fusion connecting sheet for connecting synthetic resin pipes comprises a thermoplastic synthetic resin sheet(110) of rectangular shape, a heating element(130), and a contact terminal(150). The heating element is inserted in the edge of the thermoplastic synthetic resin sheet in a U shape. The heating element is composed of a plurality of outer long heating members(131), a plurality of inner long heating members(132), and a plurality of short heating members(133). The inner long heating members are inserted in the thermoplastic synthetic resin sheet, adjacent to of the rectangular shape to the outer long heating members. The outer long heating members are inserted to the outer side of the thermoplastic synthetic resin sheet at the interval of 1~5mm. The ratio between the number of the outer long heating members and the number of the inner long heating members is 1:0.2~0.8.

Description

Electro-Fusion Connecting Sheet for Connecting Plastic Pipes

The present invention relates to an electric fusion bonding sheet for connecting a synthetic resin pipe, and more particularly, to improve the arrangement of the heating element to prevent the leakage of fluid from occurring in the connection portion of the synthetic resin pipe by the electric fusion bonding sheet It relates to a fusion bonding sheet.

Synthetic resin pipes have been used in various fields because of their durability and corrosion resistance and easy processing and construction, and recently, due to the above-mentioned advantages, they are rapidly replacing existing metallic pipes and concrete pipes. Such synthetic resin pipes are manufactured in various diameters and shapes and are mainly used as water pipes, gas pipes, heating pipes, and sewage pipes.

Synthetic resin tube as described above is produced by cutting to a certain unit length for convenience of movement and storage, the construction site is to perform the piping work by interconnecting the synthetic resin tube of the unit length. In particular, the majority of synthetic resin pipes used as water pipes, gas pipes, sewage pipes, etc. are buried in the ground. Thus, the method mainly used to connect the synthetic resin pipes buried in the ground is as follows.

First, the connection is made by a fusion machine that can pressurize in the connecting direction of the synthetic resin tube with the fitting that matches the outer diameter of the synthetic resin tube to be connected. That is, each synthetic resin tube to be connected is mounted on a fusion machine, a hot plate is injected to melt both end surfaces, and a method of pressurizing and cooling the connection is used (this method is called 'but fusion'). This method has excellent advantages in that there is no fluid leakage at the connection part, but it is not easy to handle the fusion machine, it is difficult to work due to the narrow working space in the ground, and when the diameter of the synthetic resin pipe is changed, There is a problem in terms of work efficiency, such as changing the mounting part one by one.

Next, the connection may be made using an electronic socket. The electronic socket has an inner diameter that matches the outer diameter of the synthetic resin tube to be connected, and a strand of hot wire is wound in a threaded shape with synthetic resin coating on both ends of the inner circumferential surface of the socket. When electricity is supplied to such a socket, the heating wire generates heat, thereby melting and bonding the coating part and the inner surface of the socket and the outer surface of the synthetic resin pipe to be connected. The connection using the electronic socket as described above has the advantage that the construction is relatively simple and easy to confirm the bonding result, but the heating wire does not directly heat the inner surface of the socket and the outer surface of the synthetic resin pipe, but indirectly through the coating part. Since heating takes place, there is inconvenience in construction, such as scraping the outer surface of the synthetic resin pipe before connection to remove the oxide film. In addition, since one strand of the hot wire is wound, there is a problem that a poor bonding may occur due to a short.

Next, the synthetic resin pipes may be interconnected by using an electrofusion bonding sheet. The method of connecting the synthetic resin pipe using the electrofusion bonding sheet is mainly used in double wall pipes and the like used for sewage pipes. In other words, since the wall of the synthetic resin pipe is molded into a hollow like a double walled pipe, it is a method used to connect the synthetic resin pipe when it is inappropriate to connect the synthetic resin pipe by the method such as 'butt fusion' described above.

1 is a view for explaining a process of connecting the synthetic resin pipe using the electrofusion bonding sheet, Figure 2 is a conventional electric used in the process of connecting the synthetic resin pipe using the electrofusion bonding sheet shown in FIG. It is a top view of a fusion bonding sheet.

The process of connecting the synthetic resin pipe using the electrofusion bonding sheet will be described with reference to FIG. 1.

First, a portion of the synthetic resin pipes to be joined together is wrapped with the electrofusion bonding sheet 10 and tightened using a band or the like, and then connection terminals formed at both ends of the heating element 13 of the electrofusion bonding sheet 10. 15 and the power supply line 31 of the power supply device 30 are connected to each other. Next, when electricity is supplied through the power supply device 30, the heating element 13 generates heat, and the inner surface of the electrofusion bonding sheet 10, ie, the inner surface of the thermoplastic synthetic resin sheet 11, is generated by the heating of the heating element 13. And the outer surface of the synthetic resin tube 20 is melted, bonded and cooled by the synthetic resin tube is connected to each other.

Conventional electrofusion bonding sheet used in the process of connecting the synthetic resin tube using the electro-fusion bonding sheet is a thermoplastic synthetic resin sheet 11 made of the same or similar material as the synthetic resin tube to be connected, as shown in Figure 2, It consists of a heating element (13) inserted into and attached to the inner surface of the thermoplastic synthetic resin sheet (11) and a connection terminal (15) connected to the heating element (13). The heating element 13 is disposed in a "c" shape so as to surround and melt the synthetic resin tubes to be connected.

In the conventional electrofusion bonding sheet 10 as described above, since the heating element 13 is simply disposed in a "c" shape, the inner portion of the electrofusion bonding sheet 10 is attached to the inner portion (the 'A' portion of FIG. 2). The heat generating element 13 arranged is excessively heated. When the heating element disposed in the inner portion is excessively heated as described above, the synthetic resin tube and the thermoplastic synthetic resin sheet adjacent to the excessively generated heating element are also excessively melted, thereby deforming the structure of the synthetic resin tube at the connection portion and recessing of the wall. And the like, and there is a problem that the fluid leaks to such a portion.

The present invention has been made to solve the conventional problems as described above, due to the excessive heat generation of the local heating element, the deformation of the synthetic resin pipe structure, the depression of the wall occurs, such as to solve the problem of leakage of fluid, that is, the connection portion It is an object of the present invention to provide an electrofusion bonding sheet for connecting a synthetic resin pipe without leakage of the fluid.

The present invention provides an electrofusion bonding sheet for connecting a synthetic resin pipe, the electrofusion bonding sheet for connecting a synthetic resin pipe according to the present invention,

A rectangular thermoplastic synthetic resin sheet for wrapping a portion of the synthetic resin tubes to be joined to each other;

A heating element inserted into an outer surface of the rectangular thermoplastic synthetic resin sheet in a “c” shape;

It comprises a connecting terminal formed on each end of the heating element.

The heating element,

A plurality of outer joist heating elements inserted into the outer side of the rectangular thermoplastic synthetic resin sheet;

A plurality of inner joist heating members inserted into the rectangular thermoplastic resin sheet adjacent to the outer joist heating member; And

The outer joist heating member and the inner joist heating member are connected to each other, and the outer joist heating member and the inner joist heating member are formed of a plurality of single wire heating members disposed at right angles.

Preferably, the distance between the plurality of outer joist heating members is 1 to 5 mm.

Preferably, the ratio of the number of strands of the outer long line heating member and the inner long line heating member inserted into the rectangular thermoplastic synthetic resin sheet is 1: 0.2 to 0.8.

The area ratio of the thermoplastic synthetic resin sheet into which the outer joist heating member is inserted and the synthetic resin sheet into which the inner joist heating member is inserted is preferably 1: 1.

In addition, the electrofusion bonding sheet for connecting the synthetic resin pipe according to the present invention,

A rectangular thermoplastic synthetic resin sheet for wrapping a portion of the synthetic resin tubes to be joined to each other;

A pair of heating elements inserted into the outer shell of the rectangular thermoplastic resin sheet;

A connection member for electrically connecting the first end of the pair of heating elements; And

A connection terminal formed at each of the second ends of the pair of heating elements;

The pair of heating elements,

A plurality of outer longitudinal heating members inserted into an outer side of the rectangular thermoplastic resin sheet;

A plurality of inner longitudinal heating members inserted into the rectangular thermoplastic synthetic resin sheet adjacent to the outer longitudinal heating members; And

Connecting the outer longitudinal heating member and the inner longitudinal heating member to each other and comprising a plurality of unidirectional heating members disposed at right angles to the outer longitudinal heating member and the inner longitudinal heating member;

The plurality of outer longitudinal heating members are inserted at intervals of 1 to 5 mm;

The ratio of the number of strands of the outer longitudinal heating member and the inner longitudinal heating member is characterized in that 1: 0.2 to 0.8.

The connection member for electrically connecting the first end of the pair of heating elements is preferably made of the same material as the heating element.

In addition, the area ratio of the thermoplastic synthetic resin sheet into which the outer longitudinal heating member is inserted and the thermoplastic synthetic resin sheet into which the inner longitudinal heating member is inserted is preferably 1: 1.

According to the present invention as described above, the electro-fusion bonding sheet for connecting the synthetic resin pipe, it is possible to prevent excessive heat generation of the local heating element in advance, so that the deformation of the synthetic resin pipe structure, the depression of the wall does not occur at the connection portion It is possible to prevent the leakage of the fluid.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a plan view of the electrofusion bonding sheet according to the first embodiment of the present invention, Figure 4 is a plan view of the electrofusion bonding sheet according to the second embodiment of the present invention.

As shown in Figure 3, the electrofusion bonding sheet 100 according to the first embodiment of the present invention,

A rectangular thermoplastic synthetic resin sheet 110 for wrapping a portion of the synthetic resin tubes to be joined to each other;

Heating element 130 is inserted into the "c" shape on the outer shell of the rectangular thermoplastic synthetic resin sheet 110;

It includes a connecting terminal 150 formed on both ends of the heating element 130, respectively.

The thermoplastic synthetic resin sheet 110 is to surround a portion where the synthetic resin tubes to be connected to each other (see FIG. 1), and may be sufficient to surround a portion where the synthetic resin tubes to be connected to each other, and its size, shape or There is no particular limitation on the thickness.

However, considering the efficiency of the manufacturing process and the construction process, it is preferable that the shape is rectangular in shape, the long direction (horizontal side) wraps the synthetic resin tube, and has a length that is partially overlapped, and unidirectional (vertical side). It is preferable that the synthetic resin tube has a length sufficient to sufficiently support and fix the synthetic resin tube after the connection process or the connection. In addition, the thickness of the thermoplastic synthetic resin sheet 110 preferably has a thickness sufficient to support the synthetic resin tube after the connection process or connection of the synthetic resin tube. The thermoplastic synthetic resin sheet 110 may be formed of various kinds of thermoplastic resins, and is preferably formed of the same material as the synthetic resin tube to be connected.

The heating element 130,

A plurality of outer joist heating members 131 inserted into the outer side of the rectangular thermoplastic synthetic resin sheet 110;

A plurality of inner joist heating members 132 inserted into the rectangular thermoplastic resin sheet 110 and adjacent to the outer joist heating member 131; And

A plurality of disconnection heating members connected to the outer joist heating member 131 and the inner joist heating member 132 and disposed at right angles with the outer joist heating member 131 and the inner joist heating member 132 ( 133).

The outer joist heating member 131, the inner joist heating member 132, and the disconnection heating member 133 constituting the heating element 130 are conventional metal materials used as heating elements, for example, copper, copper alloy, It is made of stainless steel (SUS) and the like.

The outer joist heating member 131 is arranged at a distance of 1 to 5 mm from another adjacent joist heating member. This is because excessive heat generation may occur when the distance between the adjacent outer joist heating members is shorter than 1 mm, and when the length is longer than 5 mm, the synthetic resin tube and the thermoplastic synthetic resin sheet may not be sufficiently melted.

The ratio of the number of strands of the outer joist heating member 131 and the inner joist heating member 132 inserted into the rectangular thermoplastic synthetic resin sheet 110 is selected in the range of 1: 0.2 to 0.8. When the ratio of the number of strands of the inner joist heating member 132 based on the outer joist heating member 131 is greater than 0.8, deformation of the synthetic resin pipe structure due to excessive heat generation, decay of the wall, etc., as in the conventional electrofusion bonding sheet This is because there is a possibility that this may occur, and when the ratio of the number of strands is less than 0.2, the synthetic resin tube and the thermoplastic synthetic resin sheet may not be sufficiently melted.

In addition, the area ratio of the thermoplastic synthetic resin sheet into which the outer joist heating member 131 is inserted and the synthetic resin sheet into which the inner joist heating member 132 is inserted is selected in the range of 1: 1. When the area ratio of the synthetic resin sheet into which the inner joist heating member 132 is inserted is smaller than 1 based on the area of the thermoplastic synthetic resin sheet into which the outer joist heating member 131 is inserted, as in the conventional electric fusion bonding sheet, This is because there is a risk of deformation of the structure of the synthetic resin pipe, depression of the wall, etc., and when the area ratio is larger than 2, the synthetic resin pipe and the thermoplastic synthetic resin sheet may not be sufficiently melted.

Figure 4 shows an electrofusion bonding sheet according to a second embodiment of the present invention, the electrofusion bonding sheet 200 according to a second embodiment of the present invention,

A rectangular thermoplastic synthetic resin sheet 210 for wrapping a portion of the synthetic resin tubes to be joined to each other;

A pair of heating elements 230 inserted into the outer shell of the rectangular thermoplastic synthetic resin sheet 210;

Connection member 240 for electrically connecting the first end of the pair of heating elements 230; And

And a connection terminal 250 formed at each of the second ends of the pair of heating elements 230.

As in the first embodiment, the thermoplastic synthetic resin sheet 210 is to surround a portion where the synthetic resin tubes to be connected to each other are joined (see FIG. 1), and may sufficiently wrap a portion where the synthetic resin tubes to be connected to each other are butted together. If there is enough, there is no particular limitation on the size, shape or thickness, but considering the efficiency in the manufacturing process and construction process, it is preferable that the shape is rectangular in shape, and the long direction (horizontal side) surrounds the synthetic pipe. After that, it has a length that is partially overlapped, and the unidirectional (vertical side) preferably has a length sufficient to sufficiently support and fix the synthetic resin tube after the process or connection of the synthetic resin tube. In addition, the thermoplastic synthetic resin sheet 210 preferably has a thickness sufficient to sufficiently support the synthetic resin tube after the connection process or the connection of the synthetic resin tube. The thermoplastic synthetic resin sheet 210 may be formed of various thermoplastic resins, and is preferably formed of the same material as the synthetic resin tube to be connected.

The pair of heating elements 230,

A plurality of outer longitudinal heating members 231 inserted into an outer side of the rectangular thermoplastic synthetic resin sheet 210;

A plurality of inner longitudinal heating members 232 inserted adjacent to the outer longitudinal heating members 231 inside the rectangular thermoplastic synthetic resin sheet 210; And

The outer longitudinal heating member 231 and the inner longitudinal heating member 232 are connected to each other, the plurality of perpendicularly disposed with the outer longitudinal heating member 231 and the inner longitudinal heating member 232 It consists of a unidirectional heating member 233.

The outer longitudinal heating member 231, the inner longitudinal heating member 232, and the unidirectional heating member 233 constituting the heating element 230 are conventional metal materials used as heating elements, for example, copper and copper. Alloy, stainless steel (SUS), and the like.

The outer longitudinal heating member 231 is arranged at a distance of 1 to 5 mm from another adjacent longitudinal heating member. This is because excessive heat generation may occur when the distance between the adjacent outer longitudinal heating members is shorter than 1 mm, and when the length is longer than 5 mm, the synthetic resin tube and the thermoplastic synthetic resin sheet may not be sufficiently melted. .

The ratio of the number of strands of the outer longitudinal heating member 231 and the inner longitudinal heating member 231 inserted into the rectangular thermoplastic synthetic resin sheet 210 is selected in the range of 1: 0.2 to 0.8. If the ratio of the number of strands of the inner longitudinal heating member 232 relative to the outer longitudinal heating member 231 is greater than 0.8, the deformation of the synthetic resin pipe structure due to excessive heat generation, the wall of the wall It is because there exists a possibility that recession etc. may occur, and when a ratio of strand number is less than 0.2, there exists a possibility that a synthetic resin tube and a thermoplastic synthetic resin sheet may not be melted sufficiently.

In addition, the area ratio of the thermoplastic synthetic resin sheet into which the outer longitudinal heating member 231 is inserted and the synthetic resin sheet into which the inner longitudinal heating member 232 is inserted is selected in the range of 1: 1. When the area ratio of the synthetic resin sheet into which the inner longitudinal heating member 232 is inserted is smaller than 1 based on the area of the thermoplastic synthetic resin sheet into which the outer longitudinal heating member 231 is inserted, as in the conventional electric fusion bonding sheet, It is because there is a possibility that deformation of the synthetic resin tube structure due to heat generation, depression of the wall, etc. may occur, and when the area ratio is larger than 2, the synthetic resin tube and the thermoplastic synthetic resin sheet may not be sufficiently melted.

In addition, the connection member 240 for electrically connecting the first end of the pair of heating elements is formed of the same material as the heating element in consideration of the heat transfer coefficient, thermal expansion coefficient and the like.

Although the present invention has been described with reference to the above-described embodiments and the accompanying drawings, different embodiments may be configured without departing from the spirit and scope of the invention. Therefore, the scope of the present invention is defined by the appended claims and equivalents thereof, and is not limited by the specific embodiments described herein.

1 is a view for explaining a process of connecting a synthetic resin pipe using an electrofusion bonding sheet.

2 is a plan view of a conventional electrofusion bonding sheet.

3 is a plan view of the electrofusion bonding sheet according to the first embodiment of the present invention.

4 is a plan view of an electrofusion bonding sheet according to a second embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: electrofusion bonding sheet

    110: thermoplastic synthetic resin sheet

    130: heating element

        131: outer joist heating member

        132: inner joist heating member

        133: disconnection heating element

    150: connection terminal

200: electrofusion bonding sheet

    210: thermoplastic synthetic resin sheet

    230: heating element

        231: outer longitudinal heating member

        232: inner longitudinal heating element

        233: unidirectional heating member

    240: connection member

    250: connection terminal

Claims (5)

A rectangular thermoplastic synthetic resin sheet for wrapping a portion of the synthetic resin tubes to be joined to each other; A heating element inserted into an outer surface of the rectangular thermoplastic synthetic resin sheet in a “c” shape; A connection terminal formed at each end of the heating element; The heating element, A plurality of outer joist heating elements inserted into the outer side of the rectangular thermoplastic synthetic resin sheet; A plurality of inner joist heating members inserted into the rectangular thermoplastic resin sheet adjacent to the outer joist heating member; And Connecting the outer joist heating member and the inner joist heating member to each other, the outer joist heating member and the inner joist heating member made up of a plurality of single wire heating members disposed at right angles; The plurality of outer joist heating elements are inserted at intervals of 1 to 5 mm; The ratio of the number of strands of the outer side joule heating member and the inner side joule heating member to be inserted into the rectangular thermoplastic synthetic resin sheet is 1: 1 to 0.2 ~ 0.8 electro-fusion bonding sheet for the synthetic resin pipe connection. The method of claim 1, The area ratio of the thermoplastic synthetic resin sheet into which the outer joist heating member is inserted and the thermoplastic synthetic resin sheet into which the inner joist heating member is inserted are 1: 1 to 2. A rectangular thermoplastic synthetic resin sheet for wrapping a portion of the synthetic resin tubes to be joined to each other; A pair of heating elements inserted into the outer shell of the rectangular thermoplastic resin sheet; A connection member for electrically connecting the first end of the pair of heating elements; And A connection terminal formed at each of the second ends of the pair of heating elements; The pair of heating elements, A plurality of outer longitudinal heating members inserted into an outer side of the rectangular thermoplastic resin sheet; A plurality of inner longitudinal heating members inserted into the rectangular thermoplastic synthetic resin sheet adjacent to the outer longitudinal heating members; And Connecting the outer longitudinal heating member and the inner longitudinal heating member to each other and comprising a plurality of unidirectional heating members disposed perpendicularly to the outer longitudinal heating member and the inner longitudinal heating member; The plurality of outer longitudinal heating members are inserted at intervals of 1 to 5 mm; The ratio of the number of strands of the outer longitudinal heating member and the inner longitudinal heating member to be inserted into the rectangular thermoplastic synthetic resin sheet is 1: 0.2 to 0.8 electrofusion bonding sheet for the synthetic resin pipe connection. The method of claim 3, The connecting member for connecting the first end of the pair of heating elements electrically connected to the synthetic resin pipe, characterized in that the same material as the heating element. The method of claim 3, The area ratio of the thermoplastic synthetic resin sheet into which the outer longitudinal heating member is inserted, and the area of the thermoplastic synthetic resin sheet into which the inner longitudinal heating member is inserted is 1: 1 to 2. .

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