Gas discharge tube

Abstract

The utility model discloses a gas discharge tube, which comprises a ceramic tube, a first electrode, a second electrode, a columnar electrode, an annular electrode and a cup-shaped tube electrode, the first electrode and the second electrode are arranged at the two ends of the ceramic tube respectively, and a gap between the first electrode and the second electrode is used for forming a containing cavity for containing the columnar electrode, the annular electrode and the cup-shaped tube electrode; the cup-shaped tube electrode is arranged on one side close to the first electrode, the columnar electrode is arranged on one side close to the second electrode, and the cup-shaped tube electrode and the columnar electrode are arranged at an interval; the annular electrode is arranged close to the second electrode. Under the condition of lightning stroke discharge, the annular electrode effectively protects the second electrode, the burning resistance of the electrode is effectively improved, the through-current capability of the discharge tube is improved, and the discharge tube is small in size and reliable in lightning stroke resistance.

Description

Technical Field

[0001] The utility model relates to the field of electrical technology, in particular to a gas discharge tube. Background Art

[0002] Discharge tubes are used in electronic equipment, signal systems and power supply systems to prevent damage caused by overvoltage caused by lightning strikes, electromagnetic pulses and operating overvoltage. Gas discharge tubes are widely used in AC power protection circuits. In order to improve the current carrying capacity, the existing technology generally adopts the method of increasing the product volume and thus increasing the discharge area, which results in an increase in the size of the product, which is not in line with the development trend of miniaturization of equipment. Utility Model Content

[0003] In view of this, the utility model provides a gas discharge tube to solve the above problems.

[0004] In order to solve the above technical problems, the utility model provides

[0005] A gas discharge tube, comprising:

[0006] Ceramic tube, first electrode, second electrode, cylindrical electrode, ring electrode and cup-shaped tube electrode;

[0007] The first electrode and the second electrode are respectively arranged at two ends of the ceramic tube, and the gap between the first electrode and the second electrode is used to form a receiving cavity for receiving the columnar electrode, the ring electrode and the cup-shaped tube electrode;

[0008] The cup-shaped tube electrode is arranged on a side close to the first electrode, the columnar electrode is arranged on a side close to the second electrode, and the cup-shaped tube electrode and the columnar electrode are arranged at intervals; the ring electrode is arranged close to the second electrode.

[0009] As an optional manner, the first electrode and the second electrode are respectively sealed with the ceramic tube.

[0010] As an optional manner, the first electrode and the second electrode are respectively provided with positioning grooves, and the positioning grooves are used to match the connection between the cup-shaped tube electrode and the columnar electrode.

[0011] As an optional manner, the annular electrode is sleeved on the columnar electrode.

[0012] As an optional manner, the geometric centers of the cup-shaped tube electrode, the cylindrical electrode and the ring electrode are located on the same straight line.

[0013] As an optional manner, in the direction from the first electrode to the second electrode, the inner diameter of the ring electrode is greater than the diameter of the columnar electrode, and the outer diameter of the ring electrode is greater than the diameter of the cup-shaped tube electrode.

[0014] As an option, the melting point of the ring-shaped electrode material is higher than the melting point of the second electrode material.

[0015] As an optional manner, a metal is provided on an end surface of the ceramic tube away from the accommodating cavity.

[0016] As an optional manner, the first electrode and the second electrode are fixed to the ceramic tube by low temperature welding, and the first electrode and the second electrode are fixed to the columnar electrode, the cup tube electrode, and the ring electrode by high temperature welding.

[0017] As an optional manner, the columnar electrode and the cup-shaped tube electrode form a first gap and a second gap respectively, and the cup-shaped tube electrode and the ring electrode form a third gap; the first gap, the second gap and the third gap are connected.

[0018] The beneficial effects of the utility model are:

[0019] The positioning grooves provided on the first electrode and the second electrode of the utility model enable the cup-shaped tube electrode and the columnar electrode to be centered on the axis. During the discharge of the columnar electrode to the side wall of the cup-shaped tube electrode, the discharge gap is more consistent, and the lightning current impact resistance is more reliable and stable. Secondly, the ring electrode covers the surface of the lower electrode. In the case of lightning discharge, the electrons under the gas discharge impact the surface of the ring electrode. The ring electrode effectively protects the lower electrode. The melting point temperature of the ring electrode material is higher than the melting point temperature of the lower electrode material, which effectively increases the anti-burning ability of the electrode and improves the current flow capacity of the discharge tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of a gas discharge tube provided in an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the ring electrode structure provided in an embodiment of the utility model.

[0022] Reference numerals and their corresponding relationships:

[0023] 1-ceramic tube; 2-first electrode; 3-second electrode; 4-cup-shaped tube electrode; 5-column-shaped electrode; 6-ring-shaped electrode; 7-discharge space gap between the outer wall of the columnar electrode and the inner wall of the cup-shaped tube electrode; 8-discharge space gap between the top of the columnar electrode and the bottom of the cup-shaped tube electrode; 9-discharge space gap between the end of the cup-shaped tube electrode and the surface of the ring electrode. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0025] See also Figure 1and Figure 2 This embodiment provides a gas discharge tube, including: a ceramic tube, a first electrode, a second electrode, a columnar electrode, a ring electrode and a cup-shaped tube electrode; the first electrode and the second electrode are respectively arranged at both ends of the ceramic tube, and the gap between the first electrode and the second electrode is used to form a receiving cavity for accommodating the columnar electrode, the ring electrode and the cup-shaped tube electrode; the cup-shaped tube electrode is arranged on a side close to the first electrode, the columnar electrode is arranged on a side close to the second electrode, and the cup-shaped tube electrode and the columnar electrode are arranged at intervals; the ring electrode is arranged close to the second electrode.

[0026] For implementation in this embodiment, please refer to Figure 1 In an optional real-time scenario, the first electrode is an upper electrode arranged at the upper end of the ceramic tube, and the second electrode is a lower electrode arranged at the lower end of the ceramic tube. They are respectively sealed with the ceramic tube to form a sealed cavity with a special gas inside as a receiving cavity for accommodating other electrodes. In the receiving cavity, the cup-shaped tube electrode is arranged on a side close to the first electrode, and the columnar electrode is arranged on a side close to the second electrode, and the cup-shaped tube electrode and the columnar electrode are arranged at intervals.

[0027] The first electrode and the second electrode are respectively provided with positioning grooves, and the positioning grooves are used to match the connection between the cup-shaped tube electrode and the columnar electrode. Specifically, the positioning groove of the first electrode makes the cup bottom of the cup-shaped tube electrode match, and the cup-shaped tube electrode is centered on the axis after welding; the positioning groove of the second electrode makes the cup bottom of the columnar electrode match, and the columnar electrode is centered on the axis after welding. In this way, when the ring electrode is sleeved on the columnar electrode, the geometric centers of the cup-shaped tube electrode, the columnar electrode and the ring electrode are located in the same straight line.

[0028] As an optional method, the ring electrode forms a tight connection with the second electrode, and the ring electrode is sleeved on the outside of the columnar electrode. The inner diameter D1 of the ring electrode is 0.05mm-0.2mm larger than the outer diameter D2 of the columnar electrode. The outer diameter of the ring electrode is larger than the outer diameter of the cup tube electrode and close to the inner diameter of the ceramic tube. The melting point temperature of the ring electrode material is higher than the melting point temperature of the second electrode material to increase the electrode's anti-burning ability.

[0029] Furthermore, the upper and second electrodes are welded to the columnar electrode, the annular electrode, and the cup-shaped tube electrode using high-temperature solder; then, a metallization layer is provided on both end surfaces of the ceramic tube, which has metallic properties and can be tightly welded to the first and second electrodes through solder, and the first electrode, the second electrode, and the ceramic tube are welded using low-temperature solder, and the welding temperature is lower than the high-temperature welding temperature, so as to prevent the component units of the firmware that have been tightly welded with the high-temperature solder from falling off during the low-temperature welding process.

[0030] Please refer again Figure 1In this embodiment, through the above-mentioned structural setting, the columnar electrode and the cup-shaped tube electrode are respectively formed with a first gap and a second gap, and the cup-shaped tube electrode and the ring electrode are formed with a third gap; the first gap, the second gap and the third gap are connected. Among them, the first gap is the discharge space gap between the outer wall side of the columnar electrode and the inner wall side of the cup-shaped tube electrode, the second gap is the space gap for discharge between the top of the columnar electrode and the bottom of the cup-shaped tube electrode, and the third gap is the space gap for discharge between the top of the columnar electrode and the bottom of the cup-shaped tube electrode. And the first gap is less than (not greater than) or equal to the second gap, and the second gap is less than or equal to the third gap. Among them, preferably, the second gap is close to the third gap. The first gap is the main gap of discharge and the main channel of discharge, so it must be larger than the second gap and the third gap; the second gap and the third gap are both auxiliary discharge areas, which provide auxiliary discharge in the large current discharge process.

[0031] Through the above scheme, in this embodiment, first, the positioning grooves provided in the first electrode and the positioning grooves provided in the second electrode enable the cup-shaped tube electrode and the columnar electrode to be centered on the axis. In the process of the columnar electrode discharging to the side wall of the cup-shaped tube electrode, the discharge gap is more consistent, and the lightning current impact resistance is more reliable and stable. Second, the ring electrode covers the surface of the second electrode. In the case of lightning discharge, the electrons under the gas discharge impact the surface of the ring electrode. The ring electrode effectively protects the second electrode. The melting point temperature of the ring electrode material is higher than the melting point temperature of the second electrode material, which effectively increases the anti-burning ability of the electrode and improves the current flow capacity of the discharge tube.

[0032] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention. The protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A gas discharge tube, characterized in that: include: Ceramic tube, first electrode, second electrode, cylindrical electrode, ring electrode and cup-shaped tube electrode; The first electrode and the second electrode are respectively arranged at two ends of the ceramic tube, and the gap between the first electrode and the second electrode is used to form a receiving cavity for receiving the columnar electrode, the ring electrode and the cup-shaped tube electrode; The cup-shaped tube electrode is arranged on a side close to the first electrode, the columnar electrode is arranged on a side close to the second electrode, and the cup-shaped tube electrode and the columnar electrode are arranged at intervals; the ring electrode is arranged close to the second electrode.

2. A gas discharge tube according to claim 1, characterized in that: The first electrode and the second electrode are respectively sealed with the ceramic tube.

3. A gas discharge tube according to claim 1, characterized in that: The first electrode and the second electrode are respectively provided with positioning grooves, and the positioning grooves are used to match the connection between the cup-shaped tube electrode and the columnar electrode.

4. A gas discharge tube according to claim 3, characterized in that: The annular electrode is sleeved on the columnar electrode.

5. A gas discharge tube according to claim 4, characterized in that: The geometric centers of the cup-shaped tube electrode, the columnar electrode and the ring electrode are located in the same straight line.

6. A gas discharge tube according to claim 1, characterized in that: In the direction from the first electrode to the second electrode, the inner diameter of the ring electrode is larger than the diameter of the columnar electrode, and the outer diameter of the ring electrode is larger than the diameter of the cup-shaped tube electrode.

7. A gas discharge tube according to claim 1, characterized in that: The melting point of the ring-shaped electrode material is higher than the melting point of the second electrode material.

8. A gas discharge tube according to claim 1, characterized in that: The end surface of the ceramic tube away from the accommodating cavity is provided with metal.

9. A gas discharge tube according to claim 1, characterized in that: The first electrode and the second electrode are respectively fixed to the ceramic tube by low temperature welding, and the first electrode and the second electrode are respectively fixed to the columnar electrode, the cup-shaped tube electrode, and the ring electrode by high temperature welding.

10. A gas discharge tube according to claim 1, characterized in that: The columnar electrode and the cup-shaped tube electrode form a first gap and a second gap respectively, and the cup-shaped tube electrode and the ring electrode form a third gap; the first gap is smaller than or equal to the second gap, the second gap is smaller than or equal to the third gap, and the first gap, the second gap and the third gap are connected.

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