JPH047649Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an overvoltage protection device that protects various electronic devices connected to it from abnormal voltages such as surges, and particularly relates to an overvoltage protection device that is small, lightweight, and easy to assemble.

Generally, electronic devices such as communication devices are always threatened by abnormal voltages generated by lightning or switches, so it is necessary to protect electronic devices from abnormal voltages. In particular, failure of electronic equipment due to abnormal voltage significantly disrupts daily life. Furthermore, the withstand voltage of recent electronic devices has become lower due to the use of semiconductors, and overvoltage protection devices have become an important element in improving the reliability of electronic devices.

Although there are various types of overvoltage protection devices, the three-dimensional overvoltage protection device usually consists of the circuit diagram shown in Figure 5.
Pole arrester 1 is used. To explain this, the neutral electrode 2 of the three-pole lightning arrester 1 is grounded, and the other two electrodes 3 and 4 are connected via varistors 5 and 6.
Connected to the line that connects to the electronic equipment you are trying to protect. The surge generated on the line is grounded via the varistors 5 and 6 and the three-pole arrester 1. In this case, even when a surge occurs on one line, the three-pole lightning arrester 1 operates to protect the electronic equipment without creating a voltage difference between the lines. In addition, the terminal voltage of the varistors 5 and 6 decreases when the three-pole arrester 1 operates, so the voltage applied to the line
This prevents follow-on current from occurring after the surge has stopped. As a practical application of this, Utility Model Publication Publication No. 56-152532 "Protector against Abnormal Voltage"
has been announced.

To summarize this, a 3.
a polar gas-filled discharge tube, b two varistors inserted and mounted in two left and right cylindrical portions provided at intervals on the substrate, c a line electrode of the three-pole gas-filled discharge tube, and the varistor. and (d) a ground terminal fitting provided between the two varistors.

Thus, the prior art overvoltage protection device
In both cases, a) a three-electrode gas-filled discharge tube is placed between two varistors, making the device horizontally long;
This creates wasted space above the ballista, b)3
Since the three-pole gas-filled discharge tube is supported by special supporting metal fittings with rivets, it is difficult to install the three-pole gas-filled discharge tube,
There is a problem in that it requires time and effort to remove, and this also affects internal inspection of the device.

This invention was made in view of the problems of the conventional technology, and aims to provide an overvoltage protection device that is miniaturized and extremely easy to assemble and inspect.

An embodiment of this invention will be described based on the drawings. A first cylindrical portion 11 is formed on the left side of the substrate 10, a varistor 13 is disposed within the first cylindrical portion 11, and a first connecting fitting 20 is disposed on the left side wall of the first cylindrical portion 11. The lower part of the first connecting fitting 20 constitutes the contact part 21 of the varistor 13, and this contact part 21 contacts the varistor 13, and the upper part of the first connecting fitting 20 forms the line of the three-electrode gas-filled discharge tube 50. This contact portion 22 constitutes a contact portion 22 with the electrode 51.
is in contact with the line electrode 51, and the first connecting fitting 2
A protrusion 23 is disposed on the left wall at an intermediate position of 0, and this protrusion 23 is inserted into the board 10 and connected to the first connection fitting 2.
0 is fixed on the substrate 10. Further, a first line terminal fitting 24 is disposed on the right side wall of the first cylindrical portion 11, and a lower part of the first line terminal fitting 24 is connected to the varistor 13.
The contact portion 25 contacts the varistor 13, and the upper center portion of the contact portion 25 is bent to the right to form a protrusion 26.
The protrusion 26 is inserted into the substrate 10 and fixes the first line terminal fitting 24 to the substrate 10. and the first
A connecting portion 27 is provided on the upper left side of the line terminal fitting 24 (see Fig. 2), and the upper end of this connecting portion 27 is bent at a right angle to form a terminal portion 28, which is intended to be protected. It is connected to the line to which electronic equipment is connected. Further, a second cylindrical portion 12 is formed on the right side of the substrate 10, a varistor 14 is disposed within this second cylindrical portion 12, and a second connecting fitting 30 is disposed on the right side wall of this second cylindrical portion 12. established,
The lower part of this second connection fitting 30 constitutes a contact part 31 of the varistor 14, and this contact part 31 is connected to the varistor 1.
4, and the upper part of the second connection fitting 30 is connected to the connection part 32 of the line electrode 52 of the triode gas-filled discharge tube 50.
The contact portion 32 contacts the line electrode 52, and a protrusion 33 is provided on the right wall of the second connection fitting 30 at an intermediate position. A metal fitting 30 is fixed to the substrate 10. Further, a second line terminal fitting 34 is disposed on the left side wall of the second cylindrical portion 12 , and the lower part of the second line terminal fitting 34 constitutes a contact portion 35 of the varistor 14 . The upper center portion of the contact portion 35 is bent to form a protrusion 36, which is inserted into the substrate 10 and fixes the second line terminal fitting 34 to the substrate 10. A connecting portion 37 is provided on the upper left side of the second line terminal fitting 34 (see FIG. 2), and the upper end of this connecting portion 37 is bent at a right angle to form a terminal portion 38. is connected to the line to which the electronic equipment to be protected is connected.

Furthermore, an earth terminal fitting 40 is arranged in the center of the board 10, and the lower part of this earth terminal fitting 40 is arranged horizontally, and a terminal part 41 is formed at the tip (a third
4), the upper part is bent vertically, and the electrode clamping part 42 of the ground electrode 53 of the triode gas-filled discharge tube 50 is disposed at the tip.

Two clamping parts 61 and 62 are provided on the inner surface of the cover 60 mounted on the upper part of the substrate 10 to clamp and support the left and right ends of the triode gas-filled discharge tube 50, respectively. The cover 60, which clamps and supports the tube 50, is mounted on the substrate 10. And the earth electrode 53 of the three-electrode gas-filled discharge tube 50
The electrode clamping part 42 of the earth terminal fitting 40 clamps and contacts the line electrodes 51 and 52 at the left and right ends of the three-electrode gas-filled discharge tube 50, and the varistor 13,
Contact parts 22, 3 of connecting fittings 20, 30 from 14
2 are in contact with each other.

In this way, the overvoltage protection device of the embodiment
By positioning the three-electrode gas-filled discharge tube above the varistor, the distance between the varistors becomes narrower, and the wasted space above the varistor is effectively utilized, making the device more compact. Since the gas-filled discharge tube can be attached to and removed from the device while being held between the covers, assembly and internal inspection of the device can be carried out extremely easily.

As mentioned above, this device has high reliability as a device, and by positioning the three-electrode gas-filled discharge tube above the varistor, the distance between the varistors can be reduced, and there is no waste above the varistor. This makes effective use of space, making the device more compact.In addition, the device can be installed and removed while the three-electrode gas-filled discharge tube is held between the covers, increasing the productivity of device assembly. On the other hand, it has practical effects such as simplifying the internal inspection work of the device.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view, Figure 2 is a cross-sectional view of the line terminal metal fitting, Figure 3 is a cross-sectional view of the earth terminal metal fitting, Figure 4 is a cross-sectional view of the terminal, and Figure 5 is a sectional view of the three-pole arrester. It is an electrical circuit diagram. 10...Substrate, 11,12...Cylinder part, 13,1
4... Varistor, 20... Connection fitting, 22... Contact part, 30... Connection fitting, 32... Contact part, 40
...Earth terminal fitting, 42...Electrode holding part, 50
...Triode gas-filled discharge tube, 51, 52...Line electrode, 53...Earth electrode, 60...Cover, 6
1,62... clamping part.

Claims (1)

[Claims for Utility Model Registration] a) A three-pole gas-filled discharge tube having line electrodes at the left and right ends and a ground electrode at the middle of the left and right sides, and b) two left and right discharge tubes provided at intervals on a substrate. two varistors inserted and mounted in the cylinder, c)
d) two connecting fittings having a contact portion above for connecting the line electrode of the three-electrode gas-filled discharge tube and the varistor; and d) a grounding terminal fitting provided between the two varistors. In the overvoltage protection device, a) two clamping parts 61 and 62 are provided on the inner surface of the cover 60 mounted on the upper part of the substrate 10 to clamp and support the left and right ends of the triode gas-filled discharge tube 50, respectively. , b) By mounting the cover 60 that clamps and supports the triode gas-filled discharge tube 50 on the substrate 10, the ground electrode 5 of the triode gas-filled discharge tube 50 is fixed.
3 is held and contacted by the electrode holding part 42 of the earth terminal fitting 40, and c) the varistor 1 is connected to the line electrodes 51 and 52 at the left and right ends of the three-electrode gas-filled discharge tube 50.
Contact portion 2 of connecting fittings 20, 30 from 3, 14
An overvoltage protection device in which 2 and 32 are in contact with each other.