JP3102776U - Surge absorbing element - Google Patents

Abstract

Provided is a surge absorbing element which prevents secondary damage to other places caused by destruction and scattering during operation and realizes this with a simple structure and at low cost.
In a surge absorbing element in which a spark gap is formed between terminal electrodes facing a discharge space in an outer tube made of a heat-brittle material such as a glass material or a resin material, an entire outer tube is provided. And covered with a cover 2 made of a heat-resistant elastic material.
In addition, the entire outer tube is covered with a cover body having heat resistance elasticity and heat shrinkage, and is heated and shrunk so as to adhere to the entire outer tube. Further, the cover body has a resin tube shape. In addition, when covering the outer tube with the cover body, a predetermined length of the lead wire 16 exposed from both ends of the outer tube is covered.
[Selection diagram] Fig. 1

Description

  The invention of the present application relates to a surge absorbing element in which a discharge current flows in a spark gap between electrodes arranged in an outer tube, and a surge absorbing element that absorbs an abnormal energy of an overcurrent or an overvoltage in an outer tube enclosing element. The present invention relates to a surge absorbing element made of a thermo-brittle material such as a resin tube.

  Electronic devices such as communication devices usually have a surge absorbing element (also referred to as a surge absorber) as a protection component that absorbs suddenly generated abnormal energy such as a short circuit or lightning to prevent fatal damage to other circuits. Is built into the circuit.

  In this surge absorption element, a pair of electrodes are arranged on the upper surface of an insulating substrate made of ceramic or the like with a small gap (commonly called “spark gap” or “micro gap”), and this is used for an outer tube such as a glass tube. It is stored and configured. Such a configuration has become mainstream from the viewpoint of cost and ease of manufacturing.

  When the outer tube is a glass tube, when the extraordinary energy, mostly high voltage is applied and the surge absorbing element is activated, the outer tube may be destroyed without retaining its original shape due to the high temperature and thermal expansion in the discharge space. is there. This phenomenon itself satisfies the original function of the surge absorbing element, and it can be said that it is preferable because fatal damage to the electronic device to which the present element is attached has been avoided.

  However, it is good if the above-mentioned breakage is limited to the degree of cracking or cracking of the glass tube, but sometimes when the glass tube fragments or various members housed in the glass tube are scattered due to rapid thermal expansion, the scattered fragments are nearby. There is a concern that the surge absorbing element may defeat the original purpose of avoiding catastrophic damage to electronic equipment by causing secondary damage that adheres to short circuits and damages circuit mounted parts. It had been.

By the way, in consideration of the above concerns, in forming the outer tube, the gap between the electrodes is covered with a transient voltage protection material obtained by drying and curing a thermosetting rubber or a synthetic resin, and this is further covered with an epoxy resin or the like. Some have high breakage resistance (for example, see Patent Document 1).
JP 2003-297606 A (Page 3-5, FIG. 1)

  The present invention proposes a surge absorbing element that aims to prevent secondary damage to other places caused by destruction and scattering when operating the surge absorbing element, and to realize this with a simple structure and at low cost. To provide.

  In order to solve the above problems, a surge absorbing element according to the present invention is configured as follows.

  That is, in the surge absorbing element in which the spark gap (15) is formed between the terminal electrodes (13) facing the discharge space in the outer tube (11) made of a thermo-brittle material, at least the entire outer tube (11) And is covered with a cover body (2) made of a heat-resistant elastic material.

  The thermo-brittle material includes not only a material such as glass which is easily broken by an impact regardless of heating, but also a resin material which is plastic at normal temperature but becomes brittle by heating, such as glass or resin. The material includes brittle materials widely without being limited to materials.

  Further, the entire outer tube (11) made of a heat-brittle material of a glass tube, a resin tube, or a combination thereof is covered with a cover body (2) having heat-resistant elasticity and heat shrinkage, and heat shrinkage is performed. Then, the outer tube (11) is brought into close contact with the entire outer tube (11).

  Further, the cover (2) is characterized in that it is made of a resinous tube.

  In addition, when covering the outer tube (11) with the cover body (2), a predetermined length of the lead wire (16) exposed from both ends of the outer tube (11) is covered.

  The reference numerals in parentheses described in the documents of the claims for utility model registration and in the section of the means for solving the above-mentioned problems are those with drawing reference numerals for reference to facilitate understanding of the structure of the invention. Of course, the present invention is not limited to the form on the drawing.

  Since the surge absorbing element of the present invention is configured as described above, the following effects can be obtained.

  That is, the surge absorbing element of the present invention allows the cover body to be attached to the outer tube easily and additionally without changing the structure and manufacturing process of the existing structure of the surge absorbing element.

  Further, even if the surge absorbing element is broken, it is possible to prevent the broken pieces of the outer tube and the constituent members from scattering, and to prevent secondary damage to the circuit board of the electronic device. Pulling also has the effect of reducing the time and cost for cleaning and repairing the circuit board due to destruction and scattering.

  Hereinafter, the best mode for carrying out the surge absorbing element according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a partially cutaway perspective view showing a surge absorbing element of an embodiment, and FIG. 2 is a perspective view showing an assembled state of the surge absorbing element of the embodiment.

  The surge absorbing element 1 according to the present embodiment is an existing surge absorbing element. For example, both ends of a substrate 12 made of an insulating material such as ceramic are sandwiched between terminal electrodes 13 made of a conductive material. A plurality of discharge electrodes 14 are arranged on the upper surface of the substrate 12 by a technique such as etching or printing to form a spark gap 15. In addition, lead wires 16 for connection to the outside are attached to the terminal electrodes 13 on both ends, and the entirety of these substrates 12 is made of an exterior tube 11 (hereinafter, referred to as a “glass tube”) made of a glass material which is a thermo-brittle material. "). The inside of the glass tube 11 is evacuated to a vacuum state or filled with an argon gas, a neon gas, a sulfur hexafluoride gas, or the like.

  In the surge absorbing element 1, there is a type in which the outer tube 11 is made of a material having high heat resistance such as ceramics, but the outer tube is made of a glass tube 11 in consideration of easiness of processing and cost. It is common to have

  The cover body 2 covers the glass tube 11 of the surge absorbing element 1 so as to be in close contact with the cover body 2, and also covers the lead wires 16 extending on both sides so as to extend to a length approximately equal to the length of the glass tube 11.

  The cover body 2 is formed from a heat-shrinkable tubular material of a synthetic resin. As shown in FIG. 2, the cover body 2 is mounted on the surge absorbing element 1 so as to cover the cover body 2, and then hot air of an appropriate temperature is applied. Is sprayed on the glass tube 11 so that the glass tube 11 is brought into close contact with at least a part of the side surface and both ends. In addition, the surge absorbing element 1 with the cover 2 attached may be placed in a high-temperature atmosphere.

  In addition, since the surge absorbing element 1 is destroyed by the heat generated by the abnormal energy, it is more preferable that the cover 2 is a highly flame-retardant material and a highly plastic material.

It is a partially notched perspective view which shows the surge absorption element of an Example. It is a perspective view showing the assembled state of the surge absorption element of an example.

Explanation of reference numerals

1 Surge absorbing element 11 Glass tube (exterior tube)
DESCRIPTION OF SYMBOLS 12 Substrate 13 Terminal electrode 14 Discharge electrode 15 Spark gap 16 Lead wire 2 Cover

Claims (5)

In a surge absorbing element in which a spark gap (15) is formed between terminal electrodes (13) facing a discharge space in an outer tube (11) made of a thermo-brittle material,
A surge absorbing element characterized by being covered with a cover body (2) made of a heat-resistant elastic material so as to include at least the entire outer tube (11). In a surge absorbing element in which a spark gap (15) is formed between terminal electrodes (13) facing a discharge space in an outer tube (11) made of a thermo-brittle material,
A surge absorbing element characterized in that the entire outer tube (11) is covered with a cover body (2) having heat-resistant elasticity and heat shrinkage, and then heat-shrinked to adhere to the entire outer tube (11). The surge absorbing element according to claim 1, wherein the outer tube made of a thermo-brittle material is a glass tube, a resin tube, or a combination thereof. 4. The surge absorbing element according to claim 1, wherein the cover (2) is formed of a resin tube. The cover (2) covers the outer tube (11) so as to cover a predetermined length of a lead wire (16) exposed from both ends of the outer tube (11). 5. The surge absorbing element according to 3, 4 or 5.

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