JPH0454716Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a surge absorption element that utilizes a discharge phenomenon between rod-shaped or plate-shaped discharge electrodes sealed in an airtight container. The present invention relates to a surge absorption element that improves response characteristics and maintains a discharge gap by interposing a discharge gap defining member formed by a non-linear resistor.

[Prior Art] Conventionally, in order to protect electronic circuit elements from transient abnormal voltages applied to electronic equipment and surges caused by induced lightning, varistors made of voltage non-linear resistors and discharge voltages sealed in airtight containers have been used. Various surge absorbing elements are used, such as arresters that utilize discharge phenomena.

Among the above-mentioned surge absorbing elements, the arrester is a surge absorbing element 1 that utilizes a discharge phenomenon, as shown in FIG. 3 is formed, external terminals 6, 6 are connected to this, the container is housed in an airtight container 5 made of a glass tube, and a discharge gas is sealed.

[Problems to be solved by the invention] By the way, this type of surge absorbing element 1 absorbs surges by glow discharge and arc discharge between discharge electrodes in discharge gas.
Although the current withstand capacity is large, it requires initial electrons and ions to start the discharge, and when a surge is applied, the discharge delay time is long, and it can be used against impulsive surges with steep rise characteristics.
There is a problem in that residual surge occurs and surge protection cannot be provided sufficiently.

In addition, the length (width) of the above-mentioned discharge interval 3 has a great effect on the DC discharge starting voltage, which is the rated voltage of the surge absorbing element 1, so it needs to be specified to a predetermined length. Alternatively, in this type of surge absorbing element 1 in which plate-shaped discharge electrodes 2, 2 are supported by external terminals 6, 6, there is a risk that variations in the length of the discharge interval 3 may occur during the manufacturing process. In particular, when the length of the discharge interval 3 was set to be very small in order to keep the rated voltage low, there was a possibility that the discharge electrodes 2 would come into contact with each other and cause a short circuit.

This invention was devised in view of the above points,
By taking advantage of the advantages of surge absorption elements that utilize discharge phenomena and improving their shortcomings, they have a large current withstand capacity, a fast response speed, and can provide sufficient protection against steep surges. It is an object of the present invention to realize a surge absorbing element that can define the distance to a predetermined length.

[Means for solving the problem] In order to achieve the above object, the surge absorbing element according to the present invention has a plurality of rod-shaped or plate-shaped discharge electrodes connected to external terminals, which are arranged substantially parallel to each other and opposed to each other. A surge absorbing element comprising a discharge gap formed between each discharge electrode, which is enclosed in an airtight container, and the external terminal is led out of the airtight container,
At least one of the discharge electrodes and a discharge gap defining member formed by a voltage non-linear resistor are inserted into an engagement hole formed in the discharge gap defining member. Thus, the discharge electrodes are engaged with each other, and the discharge interval regulating member is interposed between the discharge electrode and the other discharge electrode.

Note that the above-mentioned "engaging hole" corresponds to, for example, a "through-hole" or a "recess" formed in the above-mentioned discharge interval defining member for engagement with the above-mentioned discharge electrode.

[Operation] Since the present invention has the above-described configuration, when a surge is applied to the surge absorbing element of the present invention, the varistor operation immediately reduces the voltage non-linear resistance constituting the regulating member during the discharge period. Current flows through the body and surge absorption begins. Furthermore, the voltage drop across the resistor caused by this current instantaneously generates a glow discharge between discharges and an arc discharge through which a large current flows, and this arrester operation causes a surge. is absorbed.

Since the discharge interval regulating member is interposed between the discharge electrodes, the discharge interval is maintained at a constant length by the discharge interval regulating member, and there is no short circuit between the electrodes.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

[Example 1] FIG. 1 is a perspective view showing a surge absorbing element according to an example of the present invention. In the figure, the surge absorbing element 1 is made by processing a metal material such as nickel, copper, or aluminum into a rod or plate shape (in this example, a rod shape), and coating the surface with an emitter material such as BaCO ₃ . A pair of discharge electrodes 2, 2 are arranged substantially parallel to each other to form a discharge gap 3 between the discharge electrodes 2, 2. Furthermore, between the discharge electrodes 2, 2 and a disk-shaped discharge gap formed by a voltage non-linear resistor,
The regulating member 4 is inserted between the discharge electrodes 2,
2 is inserted through the discharge electrodes 2, and is engaged with the discharge electrodes 2 by fixing them at approximately the center thereof, and the discharge electrodes 2, 2 are sealed in an airtight container 5 formed by processing a glass tube. The voltage nonlinear resistor is, for example,
The main ingredients are metal oxides such as ZnO, BaTiO ₃ and SiC. In addition, in the airtight container 5,
Dumet wires are filled with a discharge gas appropriately selected from rare gases (He, Ne, Ar, etc.), inert gases such as nitrogen gas, sulfur hexafluoride gas, etc., and are connected to the lower ends of the discharge electrodes 2, 2, respectively. External terminals 6, 6 made of 42-6 alloy wire are led out of the airtight container 5.

As shown in the figure, a disc-shaped discharge gap defining member 4 is interposed between the discharge electrodes 2, 2, and the length of the discharge gap 3 is determined by two holes bored in the discharge gap defining member 4. Specified by the distance between through holes. Therefore, by setting the distance between these through holes accurately, the rated voltage of the surge absorbing element 1 can be set accurately, and the discharge electrodes 2 can be prevented from coming into contact with each other or being too far apart. It can be prevented.

FIGS. 2 to 6 are perspective views showing the shape of the discharge interval defining member 4 and the connection form with the discharge electrodes 2, 2 in the above embodiment.

FIG. 2 shows a modification of the above embodiment,
Disc-shaped discharge gap: A through hole bored in the regulating member 4 extends to the outer edge of the disc.

FIG. 3 shows an example in which the discharge interval (disc-shaped discharge interval smaller in diameter than the regulation member 4) is engaged with only one discharge electrode 2, and the discharge interval is engaged with only one discharge electrode 2.
The outer edge of the defining member 4 is in contact with the other electrode.
In this case as well, a discharge interval defining member 4 is interposed between the discharge electrodes 2, 2, and the length of the discharge interval 3 is defined by the distance from the through hole of the discharge interval defining member 4 to the outer edge. be done.

FIG. 4 shows that by using a cap-shaped discharge interval defining member 4 with two recesses (not shown) and inserting the tips of the discharge electrodes 2, 2 into each through hole, the discharge electrodes 2, 2 and the discharge interval regulating member 4 are engaged with each other, and the other configurations are substantially the same as the above embodiments. In this case as well, a discharge gap defining member 4 is interposed between the discharge electrodes 2, 2, and the discharge gap length 3 is defined by the distance between the two through holes.

In FIG. 5, a disc-shaped discharge interval defining member 4, 4 with a smaller diameter than that in FIG. 3 is engaged with both discharge electrodes 2, 2, and each discharge interval defining member 4,
It has a configuration in which the outer edges of the two are in contact with each other. Also in this case, the discharge interval defining members 4, 4 are interposed between the respective discharge electrodes 2, 2, and the length of the discharge interval 3 is determined by the length of the discharge interval defined by the discharge interval defining members 4, 4. The distance is defined as the sum of the distances from the through hole (not shown) to the outer edge.

In FIG. 6, a cap-shaped discharge gap defining member 4, 4 having a smaller diameter than that in FIG. 4 is engaged with both discharge electrodes 2, 2, and the outer edge of each discharge gap defining member 4, 4 is It has a contact configuration. Also in this case, the discharge interval defining members 4, 4 are interposed between the respective discharge electrodes 2, 2, and the length of the discharge interval 3 is determined by the length of the discharge interval defined by the discharge interval defining members 4, 4. The distance is defined as the sum of the distances from the recess (not shown) to the outer edge.

Note that the discharge interval in FIG.
The outer edge of the discharge electrode 2 and the other discharge electrode 2 may be simply brought into contact as described above, but if they are fixed using a conductive adhesive, the length of the discharge interval 3 becomes more stable, and the length of the discharge electrode 3 becomes more stable. It is possible to prevent the length from expanding beyond a predetermined value. The two discharge interval defining members 4, 4 in FIGS. 5 and 6 may be simply brought into contact with each other as described above, but may also be fixed with a conductive adhesive.

In addition, between each discharge formed by a voltage non-linear resistor, a varistor electrode made of conductive paint or the like is formed at the connecting portion of the regulating member 4 to the discharge electrode 2 to improve adhesive strength. This contributes to reducing contact resistance.

[Embodiment 2] FIG. 7 is a perspective view showing another embodiment of the present invention. In this embodiment, a disk-shaped discharge interval regulating member 4 is connected to three discharge electrodes 2, 2, 2, two external terminals 6, 6 are connected from the upper end of an airtight container 5, and one external terminal is connected from the lower end. The other configurations are the same as in the first embodiment. In this case, the three surge absorbing elements are connected in delta, so it is suitable as a surge absorbing element between the lines of a two-wire circuit and between the lines and the ground, and between the lines of a three-wire circuit. Furthermore, since the three elements are arranged in the same space, it exhibits good response characteristics to continuous surges.

[Effects of the invention] As detailed above, the surge absorbing element of the present invention has the following effects:
Since a discharge gap defining member formed by a voltage non-linear resistor is interposed between a plurality of discharge electrodes, when a surge is applied to this member, the surge is immediately suppressed by the voltage non-linear resistor. absorption begins,
This serves as a trigger, and the surge absorption operation further shifts to arc discharge via glow discharge between discharges. Therefore, the surge absorption characteristics of the surge absorption element of the present invention have both the quick response of a varistor and the current withstand capability of an arrester, and can provide sufficient protection against steep large current surges. Become.

In addition, since the discharge interval regulating member is interposed between each discharge electrode and the discharge interval is regulated by the discharge interval regulating member, the rated voltage of the element can be stably set. When 〓 is set to a minute value, it is possible to prevent erroneous short-circuiting between the electrodes during the manufacturing process.

Furthermore, when manufacturing the device, it is only necessary to engage the discharge interval regulating member with the discharge electrode of a conventional surge absorbing element, so that it can be provided at a low cost without requiring much material or processing cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the present invention, FIGS. 2 to 6 are perspective views showing an example of the shape of the discharge interval regulating member and the connection form with the discharge electrode, and FIG. 7 is a perspective view of another embodiment of the present invention. FIG. 8 is a perspective view showing an embodiment, and FIG. 8 is a perspective view of a conventional example. 1...Surge absorption element, 2...Discharge electrode, 3...
... between discharges, 4: between discharges, regulation member, 5: airtight container, 6: external terminal.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of rod-shaped or plate-shaped discharge electrodes connected to external terminals are arranged substantially parallel to each other to form a discharge gap between each discharge electrode, which is airtight. A surge absorbing element is sealed in a container and has the external terminal led out of the airtight container, and includes a discharge gap defining member formed by at least one of the discharge electrodes and a voltage nonlinear resistor. and,
During the discharge: Engage by inserting the discharge electrode into the engagement hole bored in the regulation member,
A surge absorbing element configured such that the discharge interval regulating member is interposed between the discharge electrode and another discharge electrode. (2) engaging one part of the plurality of discharge electrodes with a discharge gap defining member by inserting the discharge electrode into an engagement hole drilled in the discharge gap defining member; The surge absorbing element according to claim 1, wherein the outer edge of the discharge interval defining member is brought into contact with another discharge electrode. (3) engaging one part of the plurality of discharge electrodes with a discharge gap defining member by inserting the discharge electrode into an engagement hole drilled in the discharge gap defining member; The surge absorbing element according to claim 1, wherein the outer edge of the discharge interval defining member is fixed to another discharge electrode. (4) All of the plurality of discharge electrodes are engaged with one discharge gap defining member by inserting each discharge electrode into a plurality of engagement holes drilled in the discharge gap defining member. The surge absorbing element according to claim 1 of the utility model registration claim, characterized in that: (5) engaging the plurality of discharge electrodes and the plurality of discharge interval defining members by inserting each discharge electrode into an engagement hole formed in each discharge interval defining member; The surge absorbing element according to claim 1, wherein the outer edges of the defining members are brought into contact with each other during each discharge. (6) engaging the plurality of discharge electrodes and the plurality of discharge interval defining members by inserting each discharge electrode into an engagement hole formed in each discharge interval defining member; The surge absorbing element according to claim 1, which is a registered utility model, characterized in that the outer edges of the defining members are fixed to each other during each discharge. (7) The discharge electrode and the plate-shaped discharge gap defining member,
Utility model registration claims 1 to 6, characterized in that the plate-shaped discharge electrode is engaged by inserting the discharge electrode into an engagement through hole drilled in the regulating member. The surge absorbing element according to any one of the above items. (8) The discharge electrode and the cap-shaped discharge gap defining member are engaged by inserting the tip of the discharge electrode into the engagement recess formed in the cap-shaped discharge gap defining member. Claims 1 and 4 of the claims for utility model registration, which are characterized by the following:
The surge absorption element according to any one of Items 5 and 6. (9) The surge absorbing element according to any one of claims 1 to 8 of the utility model registration claim, characterized in that the number of discharge electrodes is two. (10) The surge absorbing element according to any one of claims 1 to 8 of the utility model registration claim, characterized in that the number of discharge electrodes is three. (11) Utility model registration claim 1, characterized in that the airtight container is formed from a glass tube.
The surge absorbing element according to any one of items 1 to 10. (12) The surge absorbing element according to any one of claims 1 to 11, wherein the external terminals are led out from the airtight container in the same direction. (13) The surge absorbing element according to any one of claims 1 to 11, characterized in that the external terminals are led out from the airtight container in mutually opposite directions.