JPH017987Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a pipe heater for defrosting refrigerators, etc., and particularly relates to the terminal structure of the pipe heater.

Structure of the conventional example and its problems The terminal structure of the conventional pipe heater a is as shown in Figs. 3, 4, and 5.
Cover the terminals of the silicone rubber heater b and the heat-shrinkable tube c with a lead wire e through the terminal d, cover the heat-shrinkable tube c with a rubber tube f, and connect the silicone rubber heater b and the rubber tube f. What is covered with the metal tube g is caulked to form a squeeze groove i, and the silicone rubber heater b is fixed to the metal tube g, and the silicone rubber heater b, the heat shrinkable tube c, the terminal d, the lead wire e, and the rubber tube f Since the metal tube g is made of a chloroprene rubber mold h, a heat shrink tube c installed at both ends of the pipe heater a to prevent disconnection between the silicone rubber heater b and the terminal d due to the molding pressure of the chloroprene rubber mold h. It was difficult to install, required many man-hours, and was expensive. or,
Depending on the connection between terminal d and heat shrink tube c,
This had the drawback that the heat shrinkable tube c and the silicone rubber heater b were damaged at the end surface j of the terminal d, making the connection strength unstable.

Purpose of the invention Therefore, this invention eliminates the heat shrink tube that covers the terminal of the silicone rubber heater and improves the connection strength between the silicone rubber heater and the terminal, thereby reducing material costs and man-hours, and reducing the cost of pipe heaters. The purpose is also to stabilize the connection strength of the terminal.

Structure of the Invention In order to achieve this object, the present invention is capable of holding the terminal portion with stable strength by providing a restriction groove in the terminal that connects the silicone rubber heater inserted into the metal tube and the lead wire.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, 1 is a pipe heater in which a silicone rubber heater 2 is inserted into a metal tube 6. The silicone rubber heater 2 has a terminal 3
The lead wire 4 is connected to the lead wire 4 at the end thereof, and the end thereof is covered with a rubber tube 5. The rubber tube 5 is inserted into the end of the metal tube 6. Reference numeral 7 denotes a squeeze groove provided on the outer periphery of the end portion of the metal tube 6. Reference numeral 8 denotes a squeeze groove provided on the outer periphery of the end of the terminal 3 on the silicon rubber heater 2 side. Reference numeral 9 denotes a chloroprene rubber mold that covers the ends of the silicone rubber heater 2, the terminal 3, the lead wire 4, the rubber tube 5, and the metal tube 6.

In the above structure, a restriction groove 7 is provided on the outer periphery of the metal tube 6 that covers the silicone rubber heater 2 and covers the rubber tube 5, and a restriction groove 8 is provided on the outer periphery of the terminal 3 to which the silicone rubber heater 2 is connected. It can maintain the same strength as the squeeze groove 7 of 6,
Further, by providing the restricting groove 8 in the terminal 3, the silicone rubber heater 2 is not scratched by the end face of the terminal 3, and the strength of the silicone rubber heater 2 itself can be maintained, so that stable connection strength can be obtained.

Therefore, the heat-shrinkable tube that covers the silicone rubber heater, which was conventionally necessary, can be eliminated, and the unstable connection strength caused by the connection state of the terminals of the silicone rubber heater and the heat-shrinkable tube that covers it can be eliminated.
Moreover, since the material cost and man-hours can be reduced, it can be made at low cost.

Effects of the invention As is clear from the above explanation, the invention provides stable connection strength because the strength of the silicone rubber heater itself can be maintained by providing a restriction groove on the outer periphery of the terminal to which the silicone rubber heater is connected. Furthermore, since the conventional heat shrink tube can be abolished, material costs and man-hours can be reduced, resulting in lower costs.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a main part showing an embodiment of the pipe heater of the present invention, Fig. 2 is an enlarged perspective view of the terminal in Fig. 1, Fig. 3 is a side view of a conventional pipe heater, and Fig. 4 is FIG. 5 is an enlarged perspective view of the terminal in FIG. 4. 1... Pipe heater, 2... Silicon rubber heater, 3... Terminal, 4... Lead wire, 5... Rubber tube, 6... Metal tube, 8... Throttle groove, 9...
mold.

Claims (1)

[Scope of utility model registration request] A silicone rubber heater covered with rubber tubes at both ends and inserted into a metal tube, a terminal connecting the end of this silicone rubber heater to a lead wire, and a terminal formed on the outer periphery of the end on the side of the silicone rubber heater. A pipe heater consisting of a squeeze groove and molded rubber that covers the entire end.