JPS59166787A - Pipe connector, which can be melted and bonded, manufacture of pipe connector and method of connecting pipe using pipe connector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a melt-bondable connector and a connection between the connector and a thermoplastic pipe. The pipe fitting has a sleeve overlapping the pipe or tubular member, and
This sleeve is fused or melt-bonded to the tube or tubular member.

More details (1) The present invention relates to the above-mentioned connecting tool and the above-mentioned molten bonding device, and this connecting device etc. is to be stored for molten bonding or bath melting. This melting process is carried out using an electric heating filament device embedded inside the connector or inside the tube or bag-like member.

As already disclosed, the reading device has a hollow sleeve which, like the sleeve described above, is intended for enclosing a 1c g or tubular member, and this sleeve has a helical recess. a recess surrounding the inner wall of the fitting; the fitting is attached to the outer end wall of the front tube or tubular member; When using this connector, the thermoplastic pipe or tubular member is surrounded by the connector, and when the electrically conductive wire ζ is energized, the adjacent joint surface between the sleeve and the tube or tubular member melts. The sleeve and tube etc. are fused or fused together. Such a fitting allows the ends of two tubes or tubular members to be joined together in a hermetically sealed manner.

The object of the present invention is 111) to provide a simple and improved construction of a pipe fitting or a thermoplastic pipe fitting which can be manually fused together, which has good thermal efficiency and which can be inserted into the sleeve of the tube. The goal is to create something that improves positioning.

One advantage of the present invention is that it provides a method for making a melt-connectable fitting that includes a thermoplastic sleeve, which method includes a helical cut groove around the inner wall of the sleeve. the cut groove extends obliquely relative to the surface of the inner wall, and the angle between the cut groove and the hole of the fitting of the tool is such that the cut groove extends inwardly from the flap when cutting the groove; (The flap is made of a thermoplastic material, which when cutting the groove (from the fitting, being lifted up, and the direction of sharpening of the cut groove) a helical cavity is formed within the wall of the sleeve; the method also includes the step of placing a conductive stitch in the cavity; The method further includes the step of machining the inner wall of the fitting to force the flap at least partially into the inner wall and enclosing the conductive filament within a cavity between the flap knob and the sleeve wall. It is called.

Another feature of the invention is to provide a melt-weldable removable fitting that includes a thermoplastic sleeve having an aperture, an inner wall defining the aperture, and a thermoplastic sleeve defining the aperture. The inner wall has a spiral cut groove around the inner wall, the cut groove is inclined with respect to the inner wall in the direction in which the cut groove extends, and the connector has a conductive wire. and the filament is disposed within a helical cavity, the helical cavity being formed between the notched groove and the flap, the flap having a notched groove in the inner wall of the sleeve. It is made of a thermoplastic material that is cut up during manufacture and is pressed against the inner wall of the sleeve.

Yet another feature of the present invention is to provide a method for forming a fusion bond between an end of a thermoplastic or tubular member and a tubing fitting surrounding the same, the fusion bonding method described above. Attaching the sleeve of the pipe fitting formed as described to and surrounding the end of the pipe or tubular member.

Air is passed through the electrically conductive strips to attach the sleeve to the conductive wire.
It consists of a step of fusing it to α or a tubular member.

It has been discovered by the applicant that in the melt bonding or fusing step, the inwardly extending flaps
When the 41-strand filament is passed through, it opens so as to extend toward the inside of the hole in the sleeve.

To this end, the flap contacts the tube or tubular member in the bore of the sleeve. This has the advantageous effect of improving the thermal conductivity from the conductive filament to the outer surface of the tube or tubular element, so that in the case of melt bonding of the type described above, the sleeve and the tube or tubular element are bonded together. The heat transfer between the two is significantly better than that achieved by convection or radiation. Additionally, the inner flap facilitates holding the tube or tubular member firmly, securely, and centered within the sleeve while making the fusion connection. .

The above-mentioned effect occurs because the flap opens inward, and this inner side (this is due to the effect that the thermoplastic material of the front sleeve remembers the history of the shoulder). It is believed that this memory effect causes the flap to return to the position and shape when it was first carved into the sleeve. It is thought that this is caused by a strong force.

It is also possible to provide sleeves at both ends of the fitting to allow two tubes or tubular members to be connected.

It is permissible to extend the helical increments along the front and back sleeves, but it is not preferred to run them across the connector at the same pitch. Therefore, the angle of the start pitch of fitJ is increased at the 1tfl portions at both ends of the sleeve, and this pitch is made closer to 1ti5i<
Only the ends of the sleeve are made into a Q-shape, at which the fittings are normally held in place.

Insertion of the guiding line into the cavity formed on the sides of the notch can be done manually or mechanically. Alternatively, the conductive wire may be inserted into the cavity from the bottom after forming the cavity, and in this case, the insertion may be carried out by using an appropriate insertion device with the cut groove forming tool. It can be done by incorporating it into

After making the spiral cut groove and inserting the conductive filament, each end of the conductive filament is embedded, and the cap of the electrical terminal is placed in the embedded position of the filament. wear. The conductive wire is "ironed" on the back side of the flap cut up from the helical notch to align the flap as a whole with the inner wall of the fitting and to confine the conductive wire between the flap and the sleeve. This ironing is carried out by passing the mandrel through the front connector. At the same time, to facilitate ironing, the conductive filament is briefly exposed to the ironing. It can also be heated through air.

To ensure alignment when connecting the tubes or alpha-shaped members with the joining member, a physical stop may be provided at the center of the hole of the connector.

The method of making the above-mentioned connections is to use joints or joints with a single sleeve to connect the α straightly, but also to connect similar tubular members, e.g. It can also be applied to cases where an elbow and a 90' elbow, a flange mounting member and a small diameter U, etc. are connected. In other words, the present invention can be applied to a variety of pipe connectors attached to pipes, tubular members, or various other members.

Furthermore, the present invention provides a method for bonding a thermoplastic fitting and a tube so that the connection between the thermoplastic fitting and the tube can be satisfied even when the dimensional tolerance between the fitting and the tube to which it is connected is not sufficient. Judgment 7): 1 indicates that fusion splicing is possible.

Therefore, according to the present invention, it has been found that it is possible to sufficiently fuse the fitting and the pipe even when the corresponding (diameter and outer diameter) of the fitting and the pipe are significantly different. While it is still warm after being removed from its mold, or while it is still hot, it should be placed in a cooling tank (for example, a cooling tank filled with cooling water) to at least prevent the normal shrinkage of the connector due to cooling. After being placed in the cooling bath, the fittings may be stored in a standard practical manner (therefore, for the purpose of removing the usual strain). The machine tolerances are defined and the conductive wire is inserted according to the invention. Attached so as to surround the pipe, one loop is traced to the guide wire for the melting layer.This operation heats the fittings JJD, so that the above-mentioned binding of the fittings is avoided. Sweeping has been removed,
The fitting closely aligns with the tube. This method can be applied to cases where the Itjl gap between the sieve and the connector is large.

As an alternative example, the present invention provides an inclined spiral-shaped notch on the outer periphery of the angular or alpha-shaped member. The cavity can be provided under the flap created by the groove forming device. In such an example, the sleeve of the pipe fitting is placed over the tubular member. (Insert the conductive wire into this connector, bath-fuse the connector to the α-shaped member, attach the flap to the g or α-shaped member, and attach the above-mentioned flap to the sleeve.) Let it work in the same way as it worked inside.

Hereinafter, the figures (hereinafter, embodiments of the invention will be described).

The pipe fitting 1, not shown in FIG. 1, has a sleeve made of thermoplastic material. A helical cut groove 3 (see Fig. 2) is provided on the inner wall 2ζ of this connecting tool, and this cut groove 3 is formed on the surface of the inner wall of the connecting tool that connects the opening point of the cut. Approximately 30°
It's about 60 degrees to 1. As can be seen in the figure, the cut groove has a flap 4 formed in a cantilever structure on the side of the cut groove. A cavity 8 is defined in the inner wall of the connecting device, and the conductive wire 5 is inserted 7 into the cavity 8 . A mandrel is inserted into the connecting tool, and the mandrel pushes back the inner wall of the connecting tool to a desired size, and threads the conductive wire through the conductive wire while pushing back. , said flap melts into contact with the hole of said self-sleeve 1, thus embedding the iLi self-conductive filament 5.

As shown in FIG. What should be noted here is that each of the four parts of the spiral conductive filament has a pitch angle relatively close to each other, so that the central part 7 of the connector strip (this part is In the case where the front welding is not necessary), the pitch angle is substantially larger than ζ, so that the road line traverses the central part of the strip over a relatively short distance.

FIG. 3 shows the wall 2 of the connecting device, which is in the state immediately after the aperture 5 has been inserted into the cavity 8. This third
The figure and FIG. 2 show how to naturally open the hula hoop 4 in the hole of the connector.

FIG. 4 shows the wall 2 of the fitting, which shows that the mandrel is in its later state, and that the electrically conductive wire is energized for a short time while being passed through the mandrel. The flap 4 is partially flattened and flush with the wall 2, thus enclosing the four tortoise filaments 5.

FIG. 5 ζ shows the state after a u9 made of a thermoplastic material, for example polyethylene, has been inserted into the connector and the five-piece is energized for a short time. As can be seen in this figure, l! When the 4-contact portion 4 is exposed to the force 3, a sudden change occurs, that is, the flap opens and comes into contact with the inserted flap 9. This phenomenon is...
I don't think this is due to the thermoplasticity of g9. It is clear that this phenomenon ζ improves the heat transfer to the inserted tube and makes it easier for g here to be firmly fixed coaxially to the connector.

When heated for a period of time, bath melting occurs between the inserted tube and the connector, and this melting occurs when the inserted tube is heated (
This will encourage it to spread. This molten state is shown in FIG.

The present invention exhibits greater convenience and effectiveness with the above-mentioned device, and a thermoplastic connector (
Moreover, the position of the embedding can be extremely close to the joint surface of the connector with the inserted tube.

Furthermore, according to the present invention, it is possible to thermally and efficiently weld the thermoplastic tube and the thermoplastic sleeve, and the position where the thermoplastic pipe and the thermoplastic sleeve are sufficiently welded can be clarified. By doing so, the fused joint can be strengthened.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional elevational view of a pipe connection according to the present invention and a portion connected according to the present invention, FIG. 2 is a partial enlarged cross-sectional view of the inner wall of the connector shown in FIG. 1 before connection, 3-6 are cross-sectional views of the connector of FIG. 1 at various stages during connection. 1... Sleeve, 2... Inner wall, 3... Cut groove, 4
...Flap, 5...Wire, 6...Terminal, 7...
・Central band. 1 person representative Kiyoshi Inomata Continued from page 1 Priority claim 01 March 1983 ■ United Kingdom (GB)
[Yes] 8305541 @ October 24, 1983 ■ United Kingdom (GB) ■ 8328394 527-

Claims (1)

[Claims] 1. A method for manufacturing a melt-connectable pipe fitting including a thermo-OT plastic sleeve. 2C1 The method comprises forming a helical cut groove around the inner wall of the sleeve. a tool for making the cut groove by cutting the cut groove into the surface of the inner wall so as to be inclined to the line of the cut groove; and an angle between the tool and the hole of the connecting tool. The cut grooves are created in the inner wall of the sleeve by appropriately selecting the cut grooves, and at this time, a flap is formed from the thermoplastic material of the inner wall of the sleeve that is cut and raised, and this flap is formed by jpi analysis of the cut grooves. (1) deforming the wall of the sleeve so as to form a helical cavity; The second method is to at least place the flap against the inner wall of the sleeve and insert the sexual filament into the cavity between the flap and the sleeve wall. A method for manufacturing a pipe fitting capable of melt bonding, the method comprising the step of applying a U-mark that confines the pipe fitting. 2. A thermoplastic sleeve is provided at both ends of the pipe fitting, and the sleeve allows 21 Claim 1 characterized in that the barb or 8-shaped member is made to be removed by coupling.
A method for manufacturing the bath-fusion bonded iJ fi/g connector described in section 1. 3. The melt-bondable R-connection according to claim 2, characterized in that the helical groove extends completely across the sleeve. A method of manufacturing ingredients. 4. Patent J, characterized in that the pitch angle tg- of the helical cut groove is large above the central portion between the two ends of the sleeve, as set forth in item 3 of this scope. A method of manufacturing a melt bondable d-connection. 5. Any one of the above-mentioned claims of the claims, characterized in that the wake-up-inducing filament is inserted into the cavity of the cut groove using a machine. 6. The conductive filament is inserted into the cavity, and the insertion is carried out immediately after the cavity is formed using an insertion device incorporating the notching device (5). A method for manufacturing a fusion-connectable viewing forceps according to any one of claims 1 to 5. 7. After inserting the conductive wire into the helical cavity,
The end portion of the filament is embedded and fixed, and an electrical terminal is provided at the embedded and fixed position. Method of manufacturing fittings. 8. After inserting the conductive filament into the spiral cavity,
8. A method for manufacturing a melt-bondable pipe fitting according to any one of claims 1 to 7, characterized in that a mandrel is passed through the sleeve and the flap is penetrated into the inner wall of the sleeve. 9. A method for manufacturing a melt adhesive OT capable pipe connector according to claim 8, characterized in that when the mandrel is passed through the sleeve, a current is passed through the conductive wire (V). , the connecting device is formed by molding, and the connecting device is taken out from the mold and placed in a cooling tank while still warm. 11. Forming a melt weld: l'je, a joint between an end of a thermoplastic pipe or tubular member and a surrounding tubular connector. Method 1 for connecting pipes, the method includes connecting a sleeve of a connector manufactured using the method for manufacturing a melt-connectable connector according to any one of the above claims to the pipe. or a method for connecting a tube, comprising the steps of: applying an electric current to the end of the tubular member, and melting and connecting the sleeve to the tube or α-shaped member by passing the current through the conductive wire; 12. In nine fittings which can be melted and connected, one fitting has a thermal i+J plastic sleeve having a hole and an inner wall defining the hole, and around the inner wall of said sleeve is inclined with respect to the inner wall surface of this sleeve. a notched groove; a flap made of a thermoplastic material cut and raised by cutting the notched groove into the inner wall of the sleeve and overlapped with the sleeve; and a flap made between the notched groove and the flap. A pipe connector capable of being melted and bonded, comprising a conductive wire disposed in a spiral cavity.