JPS647482B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a voltage nonlinear resistor made of, for example, zinc oxide and used for protection against overcurrents and overvoltages.

This type of non-linear resistor is usually resin-molded by baking electrodes on both sides of an element having non-linear resistor characteristics, connecting lead wires. However, such a resin-molded voltage nonlinear resistor has poor heat dissipation, and has a low long wave tail capability, long pulse width capability, and repeated energization capability, that is, a low power loss capability. Therefore, as shown in Figure 1, there is a structure in which a resistor element 1 is sandwiched between heat sinks 2 and fixed using bolts 3, but this method is time-consuming and expensive to assemble, and has the disadvantage of being weak against vibration tests. are doing.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks, provide a voltage nonlinear resistor that is easy to assemble, is inexpensive, and has a high heat dissipation effect.

The purpose of this is to have one side of the heat sink contact the electrode surface of the resistor element housed inside the insulating holder, and the other side of the heat radiator to be pressurized by a spring that engages the peripheral wall of the holder. achieved by. It is desirable that the heat dissipation body is plate-shaped and has a protruding surface at its contact portion with the electrode surface, and that the pressing portion of the spring contacts the back surface of the protruding surface.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a plan view of one embodiment of the present invention, and FIG.
The figure is a side view thereof, and FIG. 4 is a cross-sectional view taken along the line A-A' in FIG. The heat sink 21 is made of a metal with good thermal conductivity, and has a protrusion 22 formed therein by, for example, extrusion. The edge of the heat sink 21 enters the groove 41 of the holder 4 made of an insulating material, and the back surface of the protrusion 22 of the heat sink 21 is pressed by the action of the spring 5 whose end also enters the holder groove 41. . As a result,
The electrode surface of the resistor element 1 is connected to the heat sink protrusion 22
The element is in pressure contact with the surface of the element in a good thermal conductivity, and the heat of the element is well dissipated. To assemble such a voltage nonlinear resistor, first place one of the springs 5 in the center of the holder 4, then insert one of the heat sinks 21 from the left side in FIG. Place the resistor element 1 on it, then insert the other heat sink 22 from the right side in FIG.
Finally, place the other spring 5 in the center and press it.

In the embodiments shown in FIGS. 2 to 4, the terminals 23 provided on the heat sink 21 are provided at separate positions on both heat sinks. As a result, the insulation distance on the wiring becomes longer, which provides the advantage of making it easier to fix the wiring on a printed circuit board or the like. However, although the distance between the terminals becomes smaller, the terminal conductor 6 is separated from the heat sink 21 as in the embodiment shown in FIG. It is also possible to press the element 1 or the heat sink 21 into contact with the element 1 or the heat sink 21.

In the present invention, the heat dissipation effect is improved because the heat dissipation body is in direct pressure contact with the voltage non-linear resistor element, and as shown in the discharge withstand characteristic diagram in FIG. It shows superior long wave tail resistance compared to the characteristic curve 82 of the resistor without the resistor. It also increases power loss tolerance. Furthermore, since reliable heat radiation is guaranteed through simple assembly without using brazing, it can be used extremely effectively as an inexpensive protective element against overcurrent and overvoltage in electrical equipment.

[Brief explanation of drawings]

FIG. 1 is a side view of a conventional example of a voltage nonlinear resistor with a heat sink, and FIG. 2 is a plan view of an embodiment of the present invention.
Figure 3 is its side view, Figure 4 is A- of Figure 2.
5 is a plan view of another embodiment, and FIG. 6 is a pulse width-discharge current relationship diagram of a resistor according to the present invention and a resistor without a heat sink. 1... Resistor element, 21... Heat sink, 2
2... Heat sink protrusion, 4... Holder, 5... Spring.

Claims (1)

[Claims] 1. One surface of the heat radiator is in contact with the electrode surface of the resistor element housed inside the insulating holder, and the other surface of the heat radiator is pressurized by a spring that engages with the peripheral wall of the holder. A voltage nonlinear resistor characterized by: 2. The resistor according to claim 1, characterized in that the heat dissipation body is plate-shaped and has a protruding surface at the contact portion with the electrode surface, and the pressing portion of the spring contacts the back surface of the protruding surface. voltage nonlinear resistor.