JP4813010B2 - Surge absorber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a surge absorber, and more particularly to a surge absorber for absorbing surges and noises that enter a device through a power line and a signal transmission line, and surges and noises generated inside the device.
[0002]
[Prior art]
In recent years, various types of devices have been made into semiconductors, and a microcomputer is mounted and connected to a network, so that various types of information can be sent and received or controlled. In such a system, if lightning surges, switching surges, and various noises enter the device through the power line or signal transmission line, the device itself may be damaged, or data may be destroyed even if it does not. There is a risk of malfunction. In addition, the possibility that a device connected to a network malfunctions due to a surge generated inside the device propagating to the outside is increasing.
[0003]
Surge absorbers have been widely used to absorb such surges and noises at the power input terminals and signal input / output terminals of equipment and protect internal circuits.
[0004]
[Problems to be solved by the invention]
As this type of surge absorber, an absorber having a structure in which a serial connection body of a varistor element and a surge arrester element is covered with an insulating material such as an epoxy resin, or is housed in a case has been proposed (eg, patent document). 1). In this surge absorber, the shape of the varistor element and the detonator element are greatly different, the varistor element is disk-shaped, and the detonator element is a short columnar external appearance, so a case with a large volume is required. . Furthermore, if it is attempted to connect varistor elements corresponding to each line, a necessary number of surge absorbers must be used, and the connection work becomes complicated. In addition, a plurality of cases are stored in a single case, but the outer shape becomes very large, and the occupied volume becomes large during actual use, making it difficult to respond to the reduction in size and weight of equipment. .
[0005]
The present invention seeks to provide a surge absorber having a structure that has a small number of components and is extremely easy to miniaturize.
[0006]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 8-13827
[Means for Solving the Problems]
In the surge absorber according to the present invention, a varistor element is constituted by a common varistor base having a plurality of varistor elements having a rectangular plate shape, and a surge arrester element and a lead wire connected thereto are arranged on one main surface side thereof. The lead wire connected to the varistor element is arranged on the other main surface side, and these lead wires are led out in the same direction along each main surface of the varistor base, and one end side is opened. And a case where the other end side is closed and a semi-cylindrical bulging portion is provided on the entire side wall portion from the one end side to the other end side, and at least a part of the surge arrester element is in the bulging portion. The case is further filled with an insulating material.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the surge absorber according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of this embodiment, FIG. 2A is a partial sectional view seen from the front side, FIG. 2B is a partial sectional view seen from the side, and FIG. It is the fragmentary sectional view seen from the back side.
[0009]
As shown in FIG. 1, this surge absorber is open at one end and closed at the other end, and has a semi-cylindrical bulging portion 2 extending from the one end side to the other end side of one side wall portion. the casing 1 with a connection of the varistor element 3 and the lightning arrester element 4 is housed as shown in FIG. 2, is constructed is filled with an insulating resin 5. Then, the above-mentioned connecting bodies, the lead terminal portions thereof, and the lead wires 6, 7, 8 for leading out are connected to each other by using crimp fittings 9, 10, 11, 12, and further, Lead wires 6, 7 and 8 are led out from the opening of the case 1. In this example, the varistor element 3 is coated with an insulating resin such as an epoxy resin or a silicone resin. However, depending on the application and the type of molding material described later, it is not necessary to coat the element 3 in advance with a resin. Needless to say, it may be stored directly in the case 1 and further resin molded.
[0010]
Note that the bulging portion 2 is not limited to a semi-cylindrical shape, and the cross-sectional shape may be a semi-cylindrical shape such as a triangle or a polygon such as a quadrangle.
[0011]
As the insulating resin 5, an epoxy resin, a silicone resin, or the like can be used. Further, a flame retardant is added to the insulating resin 5, or an organic insulating material imparted with a flame resistance by chemical reaction thereof, or mica. If an organic insulating material imparted with flame retardancy by dispersing nonflammable inorganic insulating materials such as talc, calcium carbonate, and other silicates and calcium salts is used, safety can be improved. It goes without saying that a fillable inorganic insulating material may be used instead of the organic insulating material.
[0012]
As shown in the front view of FIG. 3A, the side view of FIG. 3B, and the rear view of FIG. 3C, the varistor element 3 has a rectangular plate shape and itself has voltage nonlinearity. , A common electrode 32 formed on one main surface thereof, electrodes 33 and 34 formed on the other main surface parallel to the varistor substrate 31 at a predetermined interval, and these electrodes And lead terminal portions 35, 36, and 37 connected to the respective pins 32, 33, and 34. In the figure, the element 3 is not covered with resin.
[0013]
As the varistor substrate 31, for example, a ceramic substrate mainly composed of zinc oxide and exhibiting voltage non-linearity itself, or a barium titanate ceramic substrate can be used. The electrodes 32, 33, and 34 are formed by printing a silver paste in a predetermined pattern and baking it.
[0014]
The lead terminal portions 35, 36, and 37 are formed by bending a wire material so that a central portion forms a loop shape, and press-molding the loop-shaped portion to make the cross-sectional shape flat. Then, the flat lead portions are connected to the electrodes 32, 33 and 34 by soldering or the like so that their external lead-out end sides are in the same direction. It is desirable to use lead-free solder for the solder.
[0015]
For the surge arrester element 4, for example, an element in which an electrode is arranged with a predetermined gap in a ceramic or heat-resistant glass container, and an inert gas such as neon, argon, nitrogen, etc. is sealed inside is used. be able to.
[0016]
As described above, the varistor element 3 and the surge arrester element 4, and further, the lead wires 6, 7, and 8 are connected by using the crimp fittings 9, 10, 11, and 12, respectively. That is, the crimping fittings 9, 10, 11, and 12 have a cylindrical shape, and the lead fitting portion 35 and the lightning arrester of the varistor element 3 are connected to the crimping fittings 9, 10, 11, and 12 in the arrangement relationship shown in FIG. The lead terminal portion 41 of the element 4, the lead terminal portion 37 and the lead wire 6, the lead terminal portion 36 and the lead wire 7, the lead terminal portion 42 and the lead wire 8 of the surge arrester element 4 are inserted, respectively, and the crimp fittings 9, 10, 11 and 12 are connected by pressing and crushing. As a result, each is mechanically and firmly connected. Here, by pressing the crimp fittings 9, 10, 11, and 12 into a flat and slightly curved shape, the connection state is further improved, and the mechanical coupling state is further strengthened. be able to. Then, the lead terminal portion 35 of the varistor element 3 is bent in the surface side direction of FIG. 3 so that the tube axis of the surge arrester element 4 and the lead wire 8 are substantially parallel to the main surface of the varistor element 3. Further, the lead terminal portions 36 and 37 are bent in the opposite direction, that is, in the rear side direction in FIG. 3, and are formed so that the lead wires 5 and 6 are substantially parallel to the main surface of the varistor element 3.
[0017]
The lead wires 6, 7, and 8 are stranded wires or single wires with insulation coating.
[0018]
After forming the lead terminal portions 35, 36, and 37, the lead wires 6 and 6 are disposed in the case 1 shown in FIG. 2D so that at least a part of the surge arrester element 4 is located in the semi-cylindrical bulge portion 2. The varistor element 3 and the surge arrester element 4 having the elements 7 and 8 are accommodated and further filled with an insulating resin such as a flame retardant epoxy resin to insulate the elements 3 and 4. The surge absorber shown in 1 is completed.
[0019]
As shown in FIG. 5, this surge absorber is used, for example, by connecting the lead wires 6 and 7 to the power supply lines 61 and 62 and connecting the lead wire 8 to the ground terminal 63. As a result, the surge coming through the lines 61 and 62 is guided to the ground through the varistor element 3 and the surge arrester element 4, thereby preventing damage and malfunction of the equipment.
[0020]
In this way, the varistor element 3 is formed into a rectangular plate shape, and a plurality of varistor elements are formed by the same varistor base 31, and the arrester element 4 used in combination with the varistor element 3 is open at one end and the other end. In the case 1 in which the side is closed and a semi-cylindrical bulging portion 2 is provided from the one end side to the other end side of the side wall portion, at least a part of the surge arrester element 4 is in the bulging portion 2. By storing it so that it is located, the number of components of the surge absorber can be reduced and the size can be significantly reduced. Furthermore, by reducing the case volume, it is possible to reduce the filling amount of an insulating material such as an insulating resin, and in combination with the reduction in the number of parts, the cost of the surge absorber can be greatly reduced.
[0021]
In addition, since crimping metal fittings are used to connect each component, even if a tensile force acts on the lead wire for any reason, the metal fittings are embedded in the filling resin, so soldering, welding, etc. This eliminates the possibility of disconnection at the connection portion of the surge absorber connected by the method and the disconnection of the lead wire, thereby improving the connection reliability.
[0022]
【The invention's effect】
The surge absorber according to the present invention uses a varistor element in which a plurality of varistor elements are formed of a common varistor base, and the base is shaped like a square plate. Further, one end is opened and the other end is closed. And a case in which a semi-cylindrical bulge is provided on the entire side wall from the one end side to the other end side so that at least a part of the surge arrester element is located in the bulge, By filling the case with an insulating resin, the size can be significantly reduced. Further, since the varistor element is a single element, the number of parts is reduced, and the cost can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing an example of an embodiment of a surge absorber according to the present invention.
2A is a partial cross-sectional view seen from the front side, FIG. 2B is a partial cross-sectional view seen from the side, FIG. 2C is a partial cross-sectional view seen from the back side, and FIG. FIG.
3A is a front view of a varistor element as a component, FIG. 3B is a side view thereof, and FIG. 3C is a rear view thereof.
FIG. 4 is a diagram for explaining a method of connecting the varistor element, the arrester element, and the lead wire, which are constituent elements thereof.
FIG. 5 is a circuit diagram showing an example of how to use the embodiment of the present invention.
[Explanation of symbols]
1 Case 2 Swelling part 3 Varistor element 4 Arrester element 5 Insulating resin (insulating material)
6, 7, 8 Lead wire 9, 10, 11 Crimp fitting 31 Varistor base 32 Common electrode 33, 34 Electrode 35, 36, 37 Lead terminal portion

Claims (2)

A varistor base having voltage non-linearity and having a rectangular plate shape, an electrode formed on one main surface of the varistor base, and the one main surface on the other main surface of the varistor base A varistor having a plurality of electrodes formed so as to face the upper electrode and spaced apart from each other, and a lead terminal portion that is bent to form a loop and is connected to the electrode and led out in the same direction Elements,
Wherein arranged on one main surface of the varistor element, and on one main surface side of the electrode of one said varistor element of the pair of terminals, the lead terminal portion bent in one main side of the varistor element A lightning tube element connected via
Each of the plurality of electrodes in the varistor element is connected to the other main surface side of the varistor element through a lead terminal portion that is bent , and led to the outside along the other main surface side of the varistor element. A plurality of lead wires arranged in such a manner and a lead wire connected to the other terminal of the surge arrester element and arranged to be led out in the same direction as the plurality of lead wires on one main surface side of the varistor element When,
A case in which one end side is open and the other end side is closed, and a semi-cylindrical bulging portion is provided on the entire side wall from the one end side to the other end side;
The connection body composed of the varistor element and the lightning tube element is housed in the case so that at least a part of the lightning tube element is located inside the bulging portion, and is insulated between the connection body and the case. Surge absorber filled with material.   The terminal part of the said varistor element and the said lightning rod element, and the terminal part and lead wire of these elements were inserted in the crimping | fitting metal fitting by corresponding combination, and it connected by pressing and crushing the said crimping | fitting metal fitting The listed surge absorber.

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