JP2826993B2 - Waterproofing method for electrical connection terminals - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a technology for waterproofing electrical connection terminals.

[0002]

2. Description of the Related Art In recent years, synthetic resin molded articles such as polyethylene such as gas pipes, water pipes, tubular covers of electric wires, and water-blocking sheets have been frequently joined by electric fusion. In this electric fusion, a heating wire is embedded in one of the resin surfaces to be fused, or a heating wire is sandwiched between the resin surfaces to be fused, and an appropriate power is supplied to the heating wire via a controller. The resin is heated and melted to perform fusion between the synthetic resin molded products.

[0003]

The above-mentioned electric fusion between synthetic resin molded articles is not only performed outdoors, but also in the case of water pipes, the work is performed around water.
Further, since there are cases where the work is performed in a water-passing state, reliable waterproofing (water blocking) is required for the electrical connection terminals of the controller and the heating wires.

[0004]

According to the present invention, a male terminal is coated with a synthetic resin coating on a front end surface thereof, and a rubber coating is formed on a base terminal surface of the male terminal continuously from a rear end of the synthetic resin coating. While covering, further fitting an annular rubber packing to the male terminal base end, the shaft hole provided in the shaft center portion of the male terminal is formed in the shaft center portion of the female terminal forming the shaft hole for fitting the male terminal. Form a shaft-shaped terminal to be fitted, configure so as to make a double contact surface when the male terminal and the female terminal are fitted, conduct electricity between the inner contact surfaces, and between the outer contact surfaces and Waterproofing is performed by the sealed connection between the protruding end surface of the male terminal and the embedded end surface of the female terminal, so that the terminal for electric connection is reliably shut off from water without impairing the original function of the terminal and is waterproofed.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on an embodiment of electrofusion between water pipes shown in the drawings.

FIG. 2 is a perspective view showing an electric fusion method. In the electric fusion between polyethylene water pipes (P), a polyethylene electrofusion joint (1) (hereinafter referred to as E) is used.
F joint) is used. As shown in FIG. 3, a heating wire (3) is buried in the inner surface of each of the receiving holes (2) of the EF joint (1), and a pair of conductive metals fixed to both ends of the heating wire (3). Female terminal (4A) (4B) is E
Each socket (2) of the F-joint (1) is buried in the axial direction from the front surface. Each E between the female terminals (4A) and (4B)
Shaft holes (5) for differentiating product types with different depths for each F-joint (1)
Is provided.

The above-mentioned EF joint (1) has a single heating wire (3) in which a nickel resin wire is covered with a polyethylene resin film via an insulating layer of a glass fiber braid at an intermediate portion, and the heating wire (3) is doubled. The heat generating wire (3) is spirally wound along a cylindrical surface to form a cylindrical shape, and the female terminals (4A) and (4B) are fixed to both ends of the heat generating wire (3) by soldering. This is put into a molding die for the EF joint (1), and the melted polyethylene resin is pressed into the die.

[0008] The EF joint (1) is inserted into the heat-generating wire (3) embedded in the inner surface of the receptacle (2) of the EF joint (1) into which the water pipe (P) to be joined is inserted via the controller (6). By heating the outer resin of the water pipe (P) and the inner resin of the receiving port (2) of the EF joint (1) to a set temperature by the heat generated by the heating wire (3), and melting the resin. The fusion of the water pipe (P) and the EF joint (1) is performed.

The controller (6) includes a start button (8) and a reset button (9) for fusion work on a front surface of a main body case (7) containing a board constituting an electronic circuit, a transformer, and the like. A liquid crystal display panel (10) for displaying an operation instruction is provided, and a power cable (12) having a power plug (11) at the tip and an EF joint (1) at the tip from the main body case (7). And a connection cable (14) having a connection connector (13) with the heating wire (3).

As shown in FIG. 1, a pair of male terminals (15A) (15) (15A) (15A) (15) made of conductive metal fitted to a pair of female terminals (4A) (4B) embedded in the end face of the EF joint (1).
B) protrudes and is fixed in parallel from the distal end face of the connector (13), and between the male terminals (15A) and (15B) is a shaft hole for type identification provided on the end face of the EF joint (1). (5) The sensor pin (16) that can move forward and backward to measure the depth
Is provided.

The male terminals (15A) and (15B) are made of a conductive metal made of a synthetic resin such as polyethylene (18). The surface of the terminal body (17) is covered with an elastic rubber film (19) from the middle part to the base end continuously from the rear end of the synthetic resin film (18). An O-ring (20), which is an annular rubber packing, is fitted to the base end of (17). on the other hand,
The female terminals (4A) and (4B) are connected to the male terminals (15
A) A cylindrical outer terminal (21) made of a conductive metal and having a circular cross section and having a shaft hole into which (15B) is fitted, and provided on the shaft core of the outer terminal (21) so as to protrude from the bottom surface. An inner terminal (22), which is a conductive metal-made circular shaft-shaped terminal fitted into a shaft hole formed in a shaft core of the terminal body (17) of the male terminal (15A) (15B); Male terminal (15
A) When the (15B) and the female terminals (4A) (4B) are fitted, the inner surface of the terminal body (17) of the male terminals (15A) (15B) and the inner terminal (22) of the female terminals (4A) (4B). The outer surface and the inner surface of the outer terminal (21) of the female terminals (4A) and (4B) and the outer surface of the terminal body (17) of the male terminals (15A) and (15B) are double-contacted. The nickel wire of the heating wire (3) is fixed to one end of the inner terminal (22) of the female terminal (4A) (4B) forming one of the contact surfaces by soldering on the back side of the outer terminal (21). One end of the terminal body (17) (17) of the male terminal (15A) (15B) forming the other of the contact surfaces is fixed to one end of the connector (13) inside the connector (13) by soldering with the conductive element wire of each connection cable (14). , Male terminal (15A) (15B) and female terminal (4
A) The male terminals (15A), (15A), (15A), (15A), which allow current to flow between the inner contact surfaces of (4B) and form one of the outer contact surfaces.
The female terminal (4A) which forms the other of the outer contact surfaces on the outer surface of the terminal body (17) of FIG.
(4B) The connector (1) that is brought into close contact with the inner surface of the outer terminal (21) and that projects the male terminals (15A) and (15B).
3) The end face and the socket (2) of the EF joint (1) in which the female terminals (4A) and (4B) are embedded are brought into close contact with the end face via the O-ring (20), and the male terminal (15A) (15B) and the female terminal (4A) and (4B) are hermetically connected to provide waterproofing.

The male terminal (15A) (15B) is tapered so that the female terminal (4A) (4B) can be easily fitted into the terminal body (1) of the male terminal (15A) (15B).
7) The synthetic resin film (18) and the rubber film (19)
The thickness is sequentially changed so that the terminal tip side is thinnest and the terminal base end side is thickest. Further, a synthetic resin film (18) is provided on the terminal tip side from the rubber film (19), and the male terminal (1) is provided.
The rubber coating (19) is protected by the synthetic resin coating (18) when the 5A) (15B) is inserted into and removed from the female terminals (4A) (4B), preventing the rubber coating (19) from peeling off and lowering the waterproof function. , Preventing reductions. Male terminal (15A)
The surface of the synthetic resin film (18) of (15B) is formed in an uneven shape, and the female terminals (4A) (4) of the male terminals (15A) and (15B) are formed.
This prevents the synthetic resin film (18) from being displaced in the insertion / removal direction or coming off from the terminal body (17) when being inserted into or removed from B).

[0013]

As is apparent from the above embodiments, according to the present invention, the front surfaces of the male terminals (15A) and (15B) are covered with a synthetic resin film (18), and the rear end of the synthetic resin film (18) is used. Continuously, the base end surfaces of the male terminals (15A) and (15B) are covered with a rubber coating (19).
A) The axial center of the female terminals (4A) and (4B) forming a shaft hole for fitting the male terminals (15A) and (15B) while fitting the annular rubber packing (20) at the base end of the (15B). A shaft-shaped terminal (22) to be fitted into a shaft hole provided in a shaft core portion of the male terminals (15A) (15B) is formed in the male terminal (15A).
A) When the (15B) and the female terminals (4A) and (4B) are fitted to each other, a double contact surface is formed, a current is supplied between the inner contact surfaces, and the outer contact surfaces and the male contact are formed. Terminal (15
A) (15B) Waterproofing is performed by the hermetic connection between the protruding end face and the female terminal (4A) (4B) embedded end face, and the electrical connection terminal is reliably shut off from water and waterproof, so that it can be used outdoors or around water. The use of electric equipment can be performed without any inconvenience.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of an electric connection terminal of the present invention.

FIG. 2 is an actual view showing an electric fusion method using the electric connection terminal.

FIG. 3 is a cross-sectional view of a joint tip of an EF joint.

[Explanation of symbols]

 (4A) (4B) Female terminal (15A) (15B) Male terminal (18) Synthetic resin coating (19) Rubber coating (20) Rubber packing

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-366088 (JP, A) JP-A-5-55728 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01R 13/52 H01R 13/52 301 B29C 65/34 F16L 47/02

Claims (1)

(57) [Claims] 1. A male terminal is coated with a synthetic resin coating on a front end surface thereof, a base end surface of the male terminal is coated with a rubber coating continuously from a rear end of the synthetic resin coating, and a ring is formed on the male terminal base end. While the rubber packing is fitted, a shaft-shaped terminal to be fitted in a shaft hole provided in the shaft center portion of the male terminal is formed in a shaft center portion of a female terminal forming a shaft hole for fitting the male terminal, The male terminal and the female terminal are configured to form a double contact surface when mated,
A method for waterproofing an electrical connection terminal, characterized in that a current is supplied between the inner contact surfaces and a waterproof connection is made between the outer contact surfaces and between the male terminal protruding end surface and the female terminal embedded end surface.