JP2890028B2 - Electrofusion fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrofusion joint used for joining a pipe made of a thermoplastic synthetic resin used as a pipe for water supply and sewage and gas.

[0002]

2. Description of the Related Art An electrofusion joint has a heating wire embedded in a contact surface of a joint made of a thermoplastic synthetic resin (when the tube is made of polyethylene, the joint is also made of polyethylene). The resin is heated and fused by supplying electric power to the heating wire, and the tube and the joint are fused.
During fusion, the pressure inside the joint increases due to the thermal expansion of the resin, and this pressure acts as a force to push the pipe out of the joint.Conventionally, the jig is used to connect the pipe to the joint or the pipe to be joined. , To keep the pipe from coming off.

[0003]

According to the above prior art, a plumbing company is required to hold and carry a retaining jig for each type and size so as to correspond to various types and sizes of joints. That's what it is and now it is.

According to the present invention, a pipe can be prevented from coming off without using a conventional jig, and a one-touch operation for preventing the pipe from coming off can be performed without requiring tools such as screws or labor. It is an object of the present invention to provide an electrofusion joint that can be performed.

[0005]

In order to achieve the above object, an electrofusion joint according to the present invention comprises a thermoplastic joint .
Thermoplastic synthetic resin joints for joining synthetic resin tubes
Embedding a heating wire in the joint surface and supplying power to the heating wire
To melt the resin by heating to fuse the pipe and the joint.
For Lectrofusion fittings
Tighten with the first split groove in the axial direction and the second split groove in the circumferential direction
Providing a fastening part to form a band, and sandwiching the first split groove
Displace the band on the fixed and movable ribs
To reduce the diameter of the receiving port.
And a heating wire terminal on the open end face of the receptacle.
Only by, the plugging tube end to the socket portion of the joint, clamping the inner surface of the fastening stopper portion integrally formed at the open end of the socket portion outside the tube surface by the cam member, by supplying power to the heating wire By heating and melting the resin and fusing the tube and the joint, the tube is prevented from coming off at the joint's fastening part without using a special jig, and the fastening part is connected to the gap between the tube and the joint. Suppressing the flow of molten resin and heat dissipation, improving the quality of fusion, and tightening the tightening part with a single touch by a cam member, without the need for tools like screws or fusion work Improve the performance.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a fastening portion according to the present invention, and FIG. 2 is a substantial view of a fusion bonding method. In FIG. 1, (1) is a T-shaped EF joint made of polyethylene, and an electric wire is provided inside the joint (1). It has embedded heat rays. Specifically, as shown in FIG. 3, the inner surface of each socket (4) of the joint (1) into which the end of the polyethylene pipe (3) used for water supply and sewage and gas is inserted, that is, the pipe (3) The heating wire (5) is embedded in the contact surface of (5). As the heating wire (5), a nickel wire or a nickel alloy wire is used as a strand, and a coated wire whose surface is coated with polyethylene is used. The heating wire (5) is provided on the open end side (the side where the pipe is inserted) of the receptacle (4). ), The heating wire (5) is folded in two and the receiving part (4)
Is inserted into the inner surface of the receiving portion (4) in a coil shape from a position inside a predetermined dimension from the opening end of the receiving portion. A pair of terminals (6) are connected to both ends of the heating wire (5), and both terminals (6) can supply power to the heating wire (5) from the open end faces (3a) of the respective receptacles (4). Thus, both terminals (6) are buried in the axial direction from the opening end surface (3a) of the receiving portion (4). Further, a terminal (7) for discriminating the type of the EF joint (1) is provided on the open end face (4a) of the receptacle (4) between the terminals (6). Therefore, three terminals (6) and (6) are provided on the open end face (3a) of each receptacle (4).
(7) is provided in proximity.

In the figure, reference numeral (8) denotes an electrofusion controller which is a power supply device for supplying power to the heating wire (5), such as an electric (electronic) circuit board and a transformer for automatic fusion control (not shown). The control box (9)
And a connector (15) for connecting a start switch (10), a reset switch (11), a liquid crystal display (12), an earth leakage breaker (13), a power cable (14), and a joint (1). A connector (17) for connecting a control cable (16) for supplying power to the heating wire (5) is disposed on the operation surface (9a) of the control box (9).

As shown in FIGS. 4 to 9, at the open end of each receiving portion (4) of the EF joint (1), a fastening portion (18) capable of fastening the inner surface to the outer surface of the pipe (3) is provided. Are integrally formed.

The fastening portion (18) has a split structure, and includes a first split groove (19) formed in an axial direction from an opening end surface (4a) of the receiving portion (4), and the first split groove (19). A second split groove (20) is formed continuously from the end of the split groove (19) in the circumferential direction of the receiving portion (4), and a first split reaching the inner surface from the outer surface of the receiving portion (4). Groove (1
9) is provided on the opposite side (a position different by 180 degrees) from the terminals (6) and (7), and the opening end face (4) of the receptacle (4) is provided.
A second groove (20) extending from the outer surface to the inner surface of the receiving portion (4) is provided to have a length substantially half of the dimension from a) to the heating wire (5) embedded region. It is provided in parallel with the opening end face (4a), and is within 180 ° from the terminal end of the first split groove (19) toward the terminal (6) (7). It is provided at a predetermined angle (θ) (approximately 135 °) up to this side, and a tightening band (21) is attached to the opening end of each socket (4) by the first and second split grooves (19) and (20). Is formed.

A movable rib (22) is integrally formed on the outer surface of the end of the band (21), and a fixed rib (23) is opposed to the movable rib (22) with a first split groove (19) interposed therebetween. ) Is formed integrally with the opening end of the receiving portion (4), and as shown in FIGS.
2) A fixing rib (23) is provided by a fastening cam member (26) mounted on the shaft (23) through the shaft holes (24) and (25).
, The inner surface of the band (21) is tightened to the outer surface of the tube (3), and the end of the tube (3) is inserted into the socket (4) in the axial direction. And the rotation of the pipe (3) is prevented.

The locking cam member (27) includes a cam lever (28) having a plate cam portion (28a) and a lever portion (28b), and a pin (2) having the cam lever (28) at one end.
Each of the ribs (22) rotatably connected via 9)
(23) and a set pin (30) that can be penetrated through the shaft holes (24) and (25).
8), the other end of the set pin (30) is provided with a locking head (30) formed by partially separating the center of the end.
a) is rotatably mounted by a pin (31), and the locking head (30a) is held by the friction with the bearing portions (30b) on both sides in a posture of being embedded along the set pin (30). Pin (30) is connected to each rib (22)
(23) can be inserted through the shaft holes (24) and (25), and after the insertion, the locking head (30a) is rotated 90 degrees to protrude at right angles to the set pin (30). The stop head (30a) functions as a head such as a bolt. The locking head (30
The plate cam portion (28a) of the cam lever (28) mounted on the side opposite to the head provided with a) has the ribs (22) (2).
3) After being inserted into the shaft holes (24) and (25) through the shaft holes (24) and (25), the locking head (30a) at the tip of the set pin (30) is closest to the pin (29) for obtaining the insertion amount that allows the rotation. The first cam surface (32) formed by
0a), the locking head (30a) is
Or set pin (3) until it comes into contact with the outer surface of (23).
0) is farther than the first cam surface (32) with respect to the pin (29) for moving the first cam surface (3).
A second cam surface (33) formed continuously with the second cam surface (33) and a pin (29) for tightening the inner surface of the fastening portion (18) to the outer surface of the tube (3); And a third cam surface (34) formed farther from the second cam surface (33).

In this embodiment, the power plug (14a) of the power cord (14) of the EF controller (8) is connected to a power source as shown in FIG. The connector (16a) of the connection cord (16) of the EF controller (8) is connected to the terminals (6) and (7) of the opening end face (4a) of the receptacle (4) of the EF joint (1) into which the end is inserted. The connector (16
a) a locking head from the outer surface of one of the ribs (22) (23) located on the opposite side to (a) to the outer surface of the other rib (fixed rib in the figure); (30a)
The set pin (30) is inserted into each shaft hole (2) from the end where the
4) Insert via (25), after this insertion FIG.
The cam lever (28) so that the first cam surface (32) comes into contact with the outer surface of the movable rib (22) as shown by the imaginary line of (3).
Is rotated so that the locking member (30a) is fixed to the fixing rib (23).
Insert the set pin (30) further to a position where it can be rotated outside the. After this insertion, the locking head (30a) is rotated 90 degrees outside the fixing rib (23) to project at right angles to the set pin (30). Thereafter, the set lever (28) is rotated (clockwise in FIG. 9) so that the second cam surface (33) comes into contact with the outer surface of the movable rib (22). It moves in the pull-out direction, and the locking head (30a) is fixed to the fixing rib (23).
, And the further movement of the set pin (30) in the pull-out direction is restricted. Thereafter, the cam lever (28) is rotated (in FIG. 9, a signal indicated by a virtual line in a clockwise direction) so as to bring the third cam surface (34) into contact with the outer surface of the movable rib (22). Pin (3
The movement of the movable rib (2) on the third cam surface (24) is restricted by the movement of the locking head (30a) in the pull-out direction of (0).
2) is brought close to the fixing rib (23), the band (21) is displaced so as to reduce the diameter of the socket (4), and the contents of the fastening portion (18) are changed to the outer surface of the pipe (3). To prevent the tube (3) from coming off and from rotating. Thereafter, when the start button (10) is turned on, the EF controller (8) supplies electric power corresponding to the type of the EF joint (1) to the heating wire (5), and the embedment range of the heating wire (5) The resin on the inner surface of the receiving portion (4) of the joint (1) and the resin on the outer surface of the corresponding tube (3) are heated and melted, so that the tube (3) and the joint (1) are automatically fused. .

After the fusion is completed, the function of the fastening portion (18) is terminated, so that the cam member (27) rotates the cam lever in the opposite manner as described above, and the locking head (30) of the set pin (30). 30a) can be connected and removed and left in a state where the tightening is released, and when the ribs (22) and (23) projecting from the outer surface of the receptacle (4) obstruct the piping, the ribs (22) and (23) are used. 22) and (23) may be cut off.

Since the band (21) is tightened on the outer peripheral side of the joint (1) on the side opposite to the power supply side to the joint (1), the tightening work can be easily performed and each terminal (6) can be tightened. The length of the band (21) that needs to be provided avoiding (7) can be formed as long as possible, and a high tightening torque can be obtained.

The band (21), that is, the fastening portion (1)
Since the tightening of 8) is performed by the cam member (27), compared to the tightening by screws, tools are not required, labor is not required, and it can be easily performed with one touch.

[0016]

Since the present invention is configured as described above, it has the following effects.

[0017]

As is apparent from the above embodiments, the present invention provides the first split groove in the axial direction in the socket (4) of the joint (1).
(19) and the second split groove (20) in the circumferential direction.
And a fastening portion (18) forming a terminal (21) is provided.
Fixed and movable holes formed facing each other across the split groove (19)
The band (21) is displaced to the band (23) (22)
Pipe clamping cam member for reducing the diameter of the opening (4)
(26), and the opening end face of the receptacle (4)
(4a) provided with a terminal (6) of a heating wire (5) ,
Without using a special jig, the pipe (3) can be retained at the fastening portion (18) of the joint (1), and the plumbing company holds a jig corresponding to the type and size of the joint, In addition, there is no need to carry, and the burden can be reduced economically and labor-intensively, and the fusing operation can be performed more easily than before, and the fastening of the fastening portion is performed by the cam member (27). It is performed with one touch, and it is possible to improve the fusion workability without requiring a tool like a screw or taking time and effort.

The fastening portion (18) is provided in a pipe (3).
The flow of the molten resin and the heat radiation from the gap between the joint and the joint (1) are suppressed, so that the fusion quality can be improved at the same time.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fastening portion according to the present invention.

FIG. 2 is an actual view of a fusing method.

FIG. 3 is a sectional view of a receptacle.

FIG. 4 is a right side view of a fastening portion.

FIG. 5 is a bottom view of the fastening portion.

FIG. 6 is a sectional view of a fastening portion.

FIG. 7 is a sectional view of a fastening portion.

FIG. 8 is a sectional view of a fastening portion.

FIG. 9 is a front view of a fastening portion.

[Explanation of symbols]

 (1) EF joint (3) Pipe (4) Receptacle (5) Heating wire (18) Clamping part (27) Clamping cam member

Claims (1)

(57) [Claims] 1. A tube (3) made of thermoplastic synthetic resin is joined.
Heating wire on the joint surface of the joint (1) made of thermoplastic synthetic resin
To bury (5) and supply power to heating wire (5)
Therefore, the resin is heated and melted to melt the pipe (3) and the joint (1).
Electrofusion joints
A first split groove (19) in the axial direction is formed in the receiving portion (4) of (1).
And the second split groove (20) in the circumferential direction and the tightening band (2).
1) forming a fastening portion (18) forming the first split groove;
Fixed and movable ribs (2) facing each other across (19)
3) At (22), displace the band (21) and
The pipe clamping cam member (2) for reducing the diameter of (4)
6) and the open end face (4) of the receptacle (4).
An electrofusion joint comprising: a ) a terminal (6) for a heating wire (5) ;