WO2017143796A1

WO2017143796A1 - Gas discharge tube

Info

Publication number: WO2017143796A1
Application number: PCT/CN2016/103195
Authority: WO
Inventors: 何济
Original assignee: 深圳市槟城电子有限公司
Priority date: 2016-02-25
Filing date: 2016-10-25
Publication date: 2017-08-31
Also published as: CN105610049B; CN105610049A

Abstract

Provided is a gas discharge tube, comprising at least one insulating tube, as well as a first electrode and a second electrode that are respectively connected in a sealed manner to both ends of the insulating tube to form an inner discharge cavity, wherein the first electrode and the insulating tube are connected in a sealed manner by means of a low-temperature sealing adhesive, and the clear height of an emitting surface of the first electrode that extends into the inner discharge cavity is greater than 0 mm and less than or equal to 1.5 mm. The gas discharge tube can discharge a lightning current or an overvoltage when suffered from a lightning strike or a surge overvoltage; furthermore, under the effect of a particular continuous current or an excess current, the sealing state becomes ineffective when the gas discharge tube is heated to fuse the low-temperature sealing adhesive. Since the clear height of the emitting surface of the electrode is very small, external air can quickly enter and contact the emitting surface for air blowout, so that a follow-up current is quickly cut off.

Description

Instruction manual Name of the invention: a gas discharge tube

Technical field

[0001] The present invention relates to the field of overvoltage protection products, and more particularly to a gas discharge tube.

Background technique

[0002] A gas discharge tube is a type of protection device that is commonly used as an overvoltage protection device. At present, the gas discharge tube generally used is formed by insulating the tube body and sealing electrodes at both ends thereof, and the inner chamber is filled with an inert gas. When the voltage across the gas discharge tube electrode exceeds the breakdown voltage of the gas, a gap discharge is caused, and the gas discharge tube rapidly changes from a high resistance state to a low resistance state to form a conduction, thereby protecting other devices connected in parallel thereto. . However, if the overvoltage is long or the frequency is high or there is a long inter-turn current or a large current 吋, the gas discharge tube will heat up due to long inter-turn or frequent overcurrent, which is too high. Temperature not only affects the safe use of other devices in the circuit, but also exposes the gas discharge tube to the risk of shorting or bursting, and even burns the customer's circuit board to form a fire.

technical problem

[0003] An object of the present invention is to provide a gas discharge tube capable of providing effective overvoltage protection for a circuit, and capable of performing arc extinguishing in a short interval between overcurrent and temperature, and rapidly cutting off the circuit.

Problem solution

Technical solution

[0004] In view of this, an embodiment of the present invention provides a gas discharge tube including at least one insulating tube body and a first electrode and a second portion that are respectively sealedly connected to both ends of the insulating tube body to form a discharge inner cavity. The electrode is characterized in that: the first electrode and the insulating tube body are sealingly connected by a low temperature sealing adhesive, wherein a net height of the emitting surface of the first electrode protruding into the discharge inner cavity is greater than 0 is less than or equal to 1.5 mm.

[0005] Further, an edge of the first electrode that protrudes into the emission surface of the discharge cavity is chamfered.

Further, the chamfer extends from an emitting surface of the first electrode to a position on an inner side surface of the first electrode opposite to the low temperature sealing adhesive.

[0007] Further, a metal ring is disposed between the first electrode and the insulating tube body, and the first electrode and the The metal rings are sealed by a low temperature sealing adhesive.

[0008] Further, the low temperature sealing adhesive is a low temperature solder or a low temperature adhesive.

[0009] Further, a clear height of the emitting surface of the second electrode extending into the discharge cavity is greater than 0 or less than or equal to 1.5 mm.

[0010] Further, the second electrode and the insulating tube body are sealingly connected by a low temperature sealing adhesive.

[0011] Further, a metal ring is disposed between the second electrode and the insulating tube body, and the second electrode and the metal ring are sealed and connected by a low temperature sealing adhesive.

Advantageous effects of the invention

Beneficial effect

[0012] The gas discharge tube of the present invention can withstand a lightning strike or surge overvoltage, and can function as a lightning current or an overvoltage; and, when subjected to a certain continuous current or excessive current, heats up due to heat generation. After the low temperature sealing adhesive is melted, the sealing state is invalid. Since the emitting surface of the electrode has a small net height, the external air quickly enters and contacts the emitting surface to perform arc extinguishing, and the subsequent current is quickly cut off.

Brief description of the drawing

DRAWINGS

[0013] In order to make the content of the present invention easier to understand, the present invention will be further described in detail below with reference to the accompanying drawings

1 is a schematic view showing the appearance of a gas discharge tube according to Embodiment 1 of the present invention;

2 is an axial cross-sectional view of a gas discharge tube according to Embodiment 1 of the present invention;

3 is an exploded view of a gas discharge tube according to Embodiment 1 of the present invention;

4 is an exploded view of a gas discharge tube according to a second embodiment of the present invention;

5 is an exploded view of a gas discharge tube according to a third embodiment of the present invention;

6 is an exploded view of a gas discharge tube according to a fourth embodiment of the present invention.

Embodiments of the invention

[0020] The present invention will be further illustrated by the following examples in conjunction with the accompanying drawings. It should be noted in advance that the high temperature solder referred to in the present invention refers to a solder having a melting point of more than 500 ° C, and a high temperature, that is, a temperature greater than 500 ° C. The low temperature referred to in the present invention is a lower temperature relative to the high temperature, and is a temperature of 500 ° C or less; the low temperature sealing adhesive of the present invention is a sealing material capable of withstanding low temperature, the material In an environment higher than the low temperature, it may be melted or even liquefied, resulting in failure to seal; the insulating tube body referred to in the present invention is a glass tube, a porcelain tube or other insulating tube body suitable as a material of the gas discharge tube; The gas discharge tube includes a diode, a triode and a multi-pole tube.

1 is a perspective view of a gas discharge tube according to a first embodiment of the present invention, and FIG. 2 is an axial sectional view of a gas discharge tube according to a first embodiment of the present invention; It is an exploded view of the gas discharge tube provided in the first embodiment of the present invention. As shown in FIG. 1-3, the gas discharge tube of this embodiment includes: an insulating tube body 11 and a first electrode 13 and a second portion respectively connected to the two ends of the insulating tube body 11 to form a discharge inner cavity The electrode 12, wherein the first electrode 13 and the insulating tube body 11 are sealingly connected by a low temperature sealing adhesive 15, wherein the first electrode 13 extends into the emitting surface of the discharge cavity The net height is greater than 0 and less than or equal to 1.5 mm, that is, the h representing the net height of the emission surface in Fig. 2 satisfies 0 < h ≤ 1.5 mm. When the low-temperature sealing adhesive 15 melts due to high temperature and external air enters the discharge inner cavity, since the net height of the emitting surface is small, the external air quickly flows to the emitting surface, and the arc of the emitting surface is aired. Extinguish the arc and quickly cut off the subsequent current.

[0022] Preferably, an edge of the first electrode 13 that protrudes into the emission surface of the discharge cavity is provided with a chamfer 131. When the low temperature sealing adhesive 15 is melted due to high temperature, external air enters the After the discharge inner cavity flows along the chamfer 131 to the emission surface, the arc of the emission surface is air-extinctioned, and the subsequent current is quickly cut off.

[0023] Further preferably, the chamfer 131 extends from an emitting surface of the first electrode 13 to a position opposite to the low temperature sealing adhesive 15 on an inner side surface of the first electrode 13 such that When the low-temperature sealing adhesive 15 is melted due to high temperature, the external air is quickly guided to the emitting surface by the chamfer 131 as soon as it enters, and the arc of the emitting surface is air-extinguished, and the subsequent current is cut off more quickly.

[0024] Preferably, a metal ring 14 is disposed between the first electrode 13 and the insulating tube body 11, and the first electrode 13 and the metal ring 14 are sealed by a low temperature sealing adhesive 15 connection. The metal ring 14 and the insulating tube 11 are sealed and connected by a high-temperature sealing adhesive 16 , and the second electrode 12 and the insulating tube 11 are sealed by a high-temperature sealing adhesive 17 . Sealed connection.

[0025] Specifically, the low temperature sealing adhesive 15 is a low temperature solder or a low temperature adhesive. Preferably, the low The warm solder is a low-temperature alloy solder or a glass solder with a melting point of about 220 °C. The low temperature adhesive is an organic binder such as glue.

[0026] The gas discharge tube of the present invention can withstand a lightning current or an overvoltage when subjected to a lightning strike or a surge overvoltage, and is heated to a certain sustained current or excessive current due to heat generation. Melting the low-temperature sealing adhesive 吋, the sealing state is invalid, because the emitting surface of the electrode has a small net height, and the chamfering on the emitting surface can guide the external air to rapidly contact the emitting surface for air arc extinguishing, Cut off the subsequent current.

Please refer to FIG. 4. FIG. 4 is an exploded view of a gas discharge tube according to Embodiment 2 of the present invention; as shown in FIG. 4, the gas discharge tube of this embodiment includes: an insulating tube 21, insulated from the same The two ends of the tube body 21 are respectively sealedly connected to form the first electrode 23 and the second electrode 22 of the discharge inner cavity, wherein the first electrode 23 and the insulating tube body 21 pass the low temperature sealing adhesive 25 a sealing connection, wherein a clear height of the emitting surface of the first electrode 23 extending into the discharge cavity is greater than 0 and less than or equal to 1.5 mm, that is, the h representing the net height of the emission surface in FIG. 2 satisfies 0 < h ≤ 1.5 mm. When the low-temperature sealing adhesive 15 is melted due to high temperature, the sealing state is disabled, and after the outside air enters the discharge inner cavity, since the net height of the emitting surface is small, the external air quickly flows to the emitting surface, and the emitting surface The arc extinguishes the air and quickly cuts off the subsequent current.

[0028] The difference between the second embodiment and the first embodiment is as follows: The second electrode 22 in the second embodiment has the same characteristics as the first electrode 21, and the net height of the emitting surface extending into the discharge cavity is greater than 0 is less than or equal to 1.5 mm. The utility model has the beneficial effects that: the inter-electrode discharge gap of the gas discharge tube is further enlarged, and when the heat is raised to melt the low-temperature sealing adhesive, the sealing state is invalid, and the external air is more likely to extinguish the gas discharge tube. Arc, quickly cut off the subsequent current. The rest of the same parts will not be described here.

Referring to FIG. 5, FIG. 5 is an exploded view of a gas discharge tube according to Embodiment 3 of the present invention; as shown in FIG. 5, the gas discharge tube of this embodiment includes: an insulating tube body 31, and the insulation The two ends of the tube body 31 are respectively sealed to form a first electrode 33 and a second electrode 32 of the discharge inner cavity, wherein the first electrode 33 and the insulating tube body 31 pass the low temperature sealing adhesive 35 a sealing connection, wherein a clear height of the emitting surface of the first electrode 33 extending into the discharge cavity is greater than 0 and less than or equal to 1.5 mm, that is, the h representing the net height of the emission surface in FIG. 2 satisfies 0 < h ≤ 1.5 mm. When the low-temperature sealing adhesive 35 melts due to high temperature, the sealing state fails, and after the outside air enters the discharge inner cavity, the outer surface is small due to the small height of the emitting surface. The gas quickly flows to the emitting surface, and the arc of the emitting surface is air-extinctioned, and the subsequent current is quickly cut off.

[0030] The third embodiment is different from the above-mentioned embodiment in that: a metal ring 39 is disposed between the second electrode 32 and the insulating tube body 31 in the third embodiment, and the second electrode 32 is The metal rings 39 are sealed by a low temperature sealing adhesive 35. The metal ring 39 and the insulating tube body 31 are sealed and connected by a high temperature sealing adhesive 37, and the second electrode 32 and the metal ring 39 are sealed by a low temperature sealing adhesive 38. connection.

[0031] The beneficial effects are as follows: the first electrode and the second electrode are both sealed with the insulating tube by a low temperature sealing adhesive, and heated to heat to melt the low temperature sealing bond. The object state, the sealing state is invalid, and the two electrode ends enter the outside air at the same time, and it is easier to perform air arc extinguishing on the gas discharge tube, and the subsequent current is quickly cut off.

6 is an exploded view of a gas discharge tube according to Embodiment 4 of the present invention; as shown in FIG. 6, the gas discharge tube of this embodiment includes: an insulating tube body 41, and two of the insulating tube bodies 41 The first electrode 43 and the second electrode 42 are respectively sealed and connected to each other, and the first electrode 43 and the insulating tube 41 are sealed and connected by a low-temperature sealing adhesive 45, wherein The net height of the emitting surface of the first electrode 43 extending into the discharge inner cavity is greater than 0 and less than or equal to 1.5 mm, that is, h representing the net height of the emitting surface in FIG. 2 satisfies 0 < h ≤ 1.5 mm. When the low-temperature sealing adhesive 45 melts due to high temperature, the sealing state fails, and after the outside air enters the discharge inner cavity, since the net height of the emitting surface is small, the external air quickly flows to the emitting surface, and the emitting surface The arc extinguishes the air and quickly cuts off the subsequent current.

[0033] The fourth embodiment is different from the third embodiment described above in that: the second electrode 42 in the fourth embodiment has the same characteristics as the first electrode 41, and the net height of the emitting surface extending into the discharge cavity is greater than 0 is less than or equal to 1.5 mm. The utility model has the beneficial effects that: the inter-electrode discharge gap of the gas discharge tube is further enlarged, and when the heat is heated to melt the low-temperature sealing adhesive, the sealing state is invalid, and the two electrode ends enter the outside air at the same time, the external air It is easier to air-extinguish the gas discharge tube and quickly cut off the subsequent current. The rest of the same parts will not be described here.

[0034] It is to be understood that the above-described embodiments are merely illustrative of the embodiments and are not intended to limit the embodiments. Certain technical features in any of the above embodiments may also be transferred to other embodiments. For those of ordinary skill in the art, other different forms of variation can be made based on the above description. Or change. There is no need and no way to exhaust all of the implementations. As long as a low temperature sealing adhesive is used to seal the discharge cavity at one electrode end, and the electrode is made of an ultrathin electrode, it is within the scope of protection of the present application.

Claims

Claim

A gas discharge tube comprising at least one insulating tube body and a first electrode and a second electrode respectively sealed and connected to two ends of the insulating tube body to form a discharge inner cavity, wherein: the first electrode and the first electrode The insulating tubes are sealed by a low temperature sealing adhesive, wherein

The net height of the emitting surface of the first electrode extending into the discharge cavity is greater than 0 or less than or equal to 1.5 mm.

A gas discharge tube according to claim 1, wherein: an edge of said first electrode that extends into said discharge cavity is chamfered.

A gas discharge tube according to claim 2, wherein: said chamfer extends from an emitting surface of said first electrode to a position on an inner side of said first electrode opposite said low-temperature sealing adhesive .

The gas discharge tube according to claim 1, wherein: a metal ring is disposed between the first electrode and the insulating tube, and a low temperature sealing bond is used between the first electrode and the metal ring. The object is sealed.

A gas discharge tube according to claim 1, wherein: said low temperature sealing adhesive is a low temperature solder or a low temperature adhesive.

The gas discharge tube according to claim 1, wherein: a net height of the emission surface of said second electrode extending into said discharge inner cavity is greater than 0 and less than or equal to 1.5 mm.

The gas discharge tube according to claim 1 or 6, wherein the second electrode and the insulating tube body are hermetically connected by a low temperature sealing adhesive.

The gas discharge tube according to claim 7, wherein: a metal ring is disposed between the second electrode and the insulating tube, and a low temperature sealing bond is used between the second electrode and the metal ring. The object is sealed.