WO2014168589A1 - Flat gas discharge tube - Google Patents

Flat gas discharge tube Download PDF

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Publication number
WO2014168589A1
WO2014168589A1 PCT/SI2014/000019 SI2014000019W WO2014168589A1 WO 2014168589 A1 WO2014168589 A1 WO 2014168589A1 SI 2014000019 W SI2014000019 W SI 2014000019W WO 2014168589 A1 WO2014168589 A1 WO 2014168589A1
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WO
WIPO (PCT)
Prior art keywords
ceramic insulator
ring
gas discharge
discharge tube
ceramic
Prior art date
Application number
PCT/SI2014/000019
Other languages
French (fr)
Inventor
Robert ROZMAN
Original Assignee
ISKRA ZAŠČITE d.o.o.
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Filing date
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Publication of WO2014168589A1 publication Critical patent/WO2014168589A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps
    • H01T1/20—Means for starting arc or facilitating ignition of spark gap
    • H01T1/22—Means for starting arc or facilitating ignition of spark gap by the shape or the composition of the electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
    • H01T4/12—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel hermetically sealed

Definitions

  • the object of the invention is a gas discharge tube for surge protection for different electronic devices, more precisely a gas discharge tube with a very thin design.
  • the technical problem, which is solved by the present invention is construction of such carrier ceramic insulator and electrodes for a gas discharge tube, which will enable optimal conditions for the ignition of gas mixture at predetermined spark- over voltage and the current load and decreasing the amount of gas discharge tube in the form of a low cylinder.
  • the aim and object of the invention is the design of such geometry of the electrodes and ceramic insulator that will have an enough long insulation distance between the ceramic electrodes.
  • the problem, which the present invention has to solve with its construction, is to prevent uncontrolled sparks inside and outside of the gas discharge tube. Both, optimization of the dimensions of individual parts as well as their installation inside the housing are challenging for construction of very thin flat gas discharge tubes.
  • a gas discharge tube generally consists of two electrodes separated by an insulator, which is usually ceramic.
  • the electrodes and the insulator form a hermetically closed cell filled with an appropriate gas mixture.
  • the gas arrester is a perfect insulating element.
  • a spark occurs between the electrodes and the current arc is established.
  • short-term current loads can reach up to 50 kA or more.
  • the distance between the electrodes and the gas mixture define the spark-over voltage and the arrester current capability. It is also important that the insulation distance on the ceramic between both electrodes is long enough to prevent uncontrolled sparks inside and outside of the gas discharge tube. A short insulation distance on the ceramic between the electrodes can lead to problems if the gas discharge tube has a very thin flat design. State of the art
  • the essence of the flat gas discharge tube according to the invention is that the ceramic insulator is cylindrically shaped and has a wider ring, a narrow ring with two metallized layers and a wider ring, that is formed into a tip in the direction towards the centre of the ceramic insulator, wherein the distance between the planes of metallization is smaller than or equal to the length of the inner wall of the ceramic tip.
  • the flat gas discharge tube includes a ceramic insulator, two metal electrodes, gas filling and a graphite coating on the ceramic insulator and has several variants of the ceramic insulator.
  • the insulation distance on the inner as well as on the outer edge of the ceramic is increased.
  • the key part of the solution is the internal tip of the ceramic insulator that extends towards the metal electrodes.
  • FIG. 5 Comparison of the of the insulation distance length on the ceramic and the gap between the electrodes Flat gas discharge tube, shown in Figures 1 and 2, includes a ceramic insulator 1 , which is preferentially Al 2 0 3 , metal electrodes 2 and 3, which are preferably symmetrical and made of copper or copper alloy, a discharge chamber 4 and a graphite coating 5.
  • a gas discharge tube is a hermetically closed discharge chamber, filled with an appropriate gas mixture, which defines the spark-over voltage of the gas discharge tube. Consequently, due to inner part 1c of the ceramic insulator 1 the metal electrodes 2 and 3 have to be bulged, so that a hermetically closed contact between the ceramic 1 and electrodes 2 and 3 is enabled.
  • the ceramic 1 has metallized layers 6 and 6' on the part where the contact with electrodes 2 and 3 is established by soldering.
  • the flat gas discharge tube includes a ceramic insulator 1 , which is cylindrically shaped and has a wider ring 1a, a narrow ring 1b with metallized layers 6 and 6', narrowed ring 1c and a wider ring 1d, that is formed into a tip a with sides 1d' and 1d" in the direction towards the centre of the ceramic insulator 1.
  • the distance between the planes of metallization 6 and 6' is smaller than or equal to the length of sides 1d' and 1d" of the inner wall of the ceramic tip 1.
  • Ceramic 1 is covered with a graphite coating 5.
  • Electrode 2 has the shape of a circular plate, which has a part 2a soldered to the metallized layer 6 on part 1a of the ceramic insulator 1. From part 2a the electrode 2 is bulged into part 2b, which is narrowed into the middle part 2c. Because the electrode 2 is circular, the bulged part 2b is raised above the part 1c of the ceramic insulator 1.
  • electrode 3 On the upper side of the ceramic insulator 1 is electrode 3 in the shape of a circular plate, which has a part 3a soldered to the metallized layer 6' on part 1a of the ceramic insulator 1. From part 3a the electrode 3 is bulged into part 3b, which is narrowed into the middle part 3c.
  • the height of the gas discharge tube is approximately 3 mm or less, while the diameter of the gas discharge tube is approximately 30 mm.
  • the height of the gas discharge tube is defined with the distance between the lower bulged part 2b of the electrode 2 and the upper bulged part 3b of the electrode 3 or with the height of the outer part 1a of the ceramic 1.
  • the diameter of the gas discharge tube is equal to the diameter of the ceramic insulator 1.
  • Flat gas discharge tube includes a ceramic insulator 11 , which is cylindrically shaped and has a ring 11a that is widened into a wider ring 11b.
  • Ring 11a with metallized layers 16 and 16' on the ceramic insulator 11 is hermetically jointed via metallized layers 16 and 16' on the ceramic insulator 11 and soldered joints on the part of metal electrodes 12 and 13, and is filled with an appropriate gas mixture.
  • Electrode 12 has the shape of a circular plate, which has a part 12a soldered to the metallized layer 16 of the part 11a of the ceramic insulator 11. From part 12a the electrode 12 is bulged into part 12b, which is further narrowed into middle part 12c.
  • the bulged part 12b is raised above the part 11c of the ceramic insulator 11.
  • electrode 13 On the upper side of the ceramic insulator 11 is electrode 13 in the shape of a circular plate, which has part 13a soldered to the metallized layer 16' of layer 11a of the ceramic insulator 11. From part 13a the electrode is bulged into part 13b, which is further narrowed into middle part 13c.
  • Flat gas discharge tube includes a ceramic insulator 21 , which is cylindrically shaped and has a ring 21a, with is widened into a wider ring 21 b, which is formed into a tip in the direction towards the centre of the ceramic insulator 21.
  • Ring 21a with metallized layers 26 and 26' on the ceramic insulator 21 is hermetically jointed via metallized layers 26 and 26' on the ceramic insulator 21 and soldered joints on the part of metal electrodes 22 and 23, and is filled with an appropriate gas mixture.
  • Flat gas discharge tube includes a ceramic insulator 31 , which is cylindrically shaped and has a ring 31a, which is narrowed into a ring 31b and is then widened into a wider ring 31c, which is formed into a tip in the direction towards the centre of the ceramic insulator 31.
  • Ring 31a with metallized layers 36 and 36' on the ceramic insulator 31 is hermetically jointed via metallized layers 36 and 36' on the ceramic insulator 31 and soldered joints on the part of metal electrodes 32 and 33, and is filled with an appropriate gas mixture.
  • Flat gas discharge tube includes a ceramic insulator 41 , which is cylindrically shaped and has a ring 41a, which is formed into a tip 41 b in the direction towards the centre of the ceramic insulator 41.
  • Ring 41a with metallized layers 46 and 46' on the ceramic insulator 41 is hermetically jointed via metallized layers 46 and 46' on the ceramic insulator 41 and soldered joints on the part of metal electrodes 42 and 43, and is filled with an appropriate gas mixture.
  • Flat gas discharge tube includes a ceramic insulator 51 , which is cylindrically shaped and has a ring 51a, which is narrowed into part 51b, which is then formed into a tip 51c in the direction towards the centre of the ceramic insulator 51.
  • Ring 51a has metallized rings 56 and 56'.
  • Flat gas discharge tube includes a ceramic insulator 61 , which is cylindrically shaped and has a ring 61a, which is narrowed into ring 61 b and narrowed into 61c and widened into ring 61 d, which is formed into a tip in the direction towards the centre of the ceramic insulator 61.
  • Ring 61a with metallized layers 66 and 66' on the ceramic insulator 61 is hermetically jointed via metallized layers 66 and 66' on the ceramic insulator 61 and soldered joints on the part of metal electrodes 62 and 63, and is filled with an appropriate gas mixture.
  • Flat gas discharge tube according to variant VII includes a ceramic insulator 71 , which is cylindrically shaped and has an outer ring 71a, which is narrowed before the middle ring 71 b, which is further narrowed and finally forms a tip 71c in the direction towards the centre of the ceramic insulator 71.
  • This variant of the ceramic insulator allows visual detection of damage of the gas discharge tube. It is known that the gas discharge tube in the case of mechanical overload, for example fall from a height, can begin to leak, resulting in altered gas mixture inside the chamber.

Abstract

The object of the invention is a gas discharge tube for surge protection of different electronic devices, more precisely a gas discharge tube with a very thin design. The flat gas discharge tube includes a ceramic insulator (1), two metal electrodes (2,3), gas filling and a graphite coating (5) on the ceramic insulator, and is characterized in that the ceramic insulator is cylindrically shaped and has a wider ring (1a), a narrow ring (1b) with metallized layers (6,6') and a wider ring (1d), which is formed into a tip in the direction towards the centre of the ceramic insulator, wherein the distance between the planes with metallization is smaller than or equal to the distance of the inner wall (1d', 1d") of the ceramic tip. The insulation distance on the ceramic insulator between the electrodes is increased with the shape of the ceramic insulator and the shape of electrodes, which enables optimal performance of the gas discharge tube.

Description

FLAT GAS DISCHARGE TUBE
Field of the invention
The object of the invention is a gas discharge tube for surge protection for different electronic devices, more precisely a gas discharge tube with a very thin design.
Technical problem
The technical problem, which is solved by the present invention, is construction of such carrier ceramic insulator and electrodes for a gas discharge tube, which will enable optimal conditions for the ignition of gas mixture at predetermined spark- over voltage and the current load and decreasing the amount of gas discharge tube in the form of a low cylinder. The aim and object of the invention is the design of such geometry of the electrodes and ceramic insulator that will have an enough long insulation distance between the ceramic electrodes. The problem, which the present invention has to solve with its construction, is to prevent uncontrolled sparks inside and outside of the gas discharge tube. Both, optimization of the dimensions of individual parts as well as their installation inside the housing are challenging for construction of very thin flat gas discharge tubes.
A gas discharge tube generally consists of two electrodes separated by an insulator, which is usually ceramic. The electrodes and the insulator form a hermetically closed cell filled with an appropriate gas mixture. At low voltages on the electrodes the gas arrester is a perfect insulating element. When the voltage rises above a certain threshold, usually between about 100 and 1500 V, a spark occurs between the electrodes and the current arc is established. In these situations short-term current loads can reach up to 50 kA or more. The distance between the electrodes and the gas mixture define the spark-over voltage and the arrester current capability. It is also important that the insulation distance on the ceramic between both electrodes is long enough to prevent uncontrolled sparks inside and outside of the gas discharge tube. A short insulation distance on the ceramic between the electrodes can lead to problems if the gas discharge tube has a very thin flat design. State of the art
Already known gas discharge tubes are usually designed in a cylindrical shape with their diameter comparable to their height. However, flat gas discharge tubes with the ratio between height and diameter approximately 1 :10 are often needed. Such discharge tubes allow installation into devices, wherein the lack of space exists only in one direction. This most commonly occurs in the case of a large number of gas discharge tubes connected in series. Surge protection devices can contain other elements, such as varistors, various circuit breakers and contacts, which further reduce the space reserved for a gas discharge tube.
Several different solutions of flat gas discharge tubes are known. One is described in the patent application US 2010/0156264 A1 , according to which the ceramic insulator has a special step, which shortens the inner wall of the ceramic insulator, but elongates the insulation distance on the ceramic between both electrodes on the inner side. The disadvantage of this solution is that in the case of reducing the height of the ceramic insulator and consequently thinning of the entire gas discharge tube, the insulation distance on the outer side of the ceramic is reduced. This can lead to undesirable sparks on the outer side of the ceramic insulator. A solution for this problem was described in the patent application EP 1 995 837 A2. In this case the step on the ceramics is located on both sides of the ceramic insulator, inner as well as the outer. The problem of such solutions of very thin gas discharge tubes is that the difference between the outer and the inner edge of the ceramic insulator becomes very large. Consequently, only a smaller part of the gas discharge tube is intended for flow conduction between the metal electrodes. Solution of the technical problem
The essence of the flat gas discharge tube according to the invention is that the ceramic insulator is cylindrically shaped and has a wider ring, a narrow ring with two metallized layers and a wider ring, that is formed into a tip in the direction towards the centre of the ceramic insulator, wherein the distance between the planes of metallization is smaller than or equal to the length of the inner wall of the ceramic tip. The flat gas discharge tube includes a ceramic insulator, two metal electrodes, gas filling and a graphite coating on the ceramic insulator and has several variants of the ceramic insulator.
With the new geometric solution of the ceramic insulator the insulation distance on the inner as well as on the outer edge of the ceramic is increased. When insulation distances are short, premature breakthroughs can occur, reflecting in an unstable spark-over voltage. The key part of the solution is the internal tip of the ceramic insulator that extends towards the metal electrodes.
For a further understanding of the gas discharge tube according to the invention, reference should be made to the following detailed disclosure, taken in conjunction with the accompanying figures, which show:
Figure 1 Gas discharge tube
Figure 2 Cross-section A - A
Figure 3a Flat gas discharge tube according to variant I
Figure 3b Flat gas discharge tube according to variant II
Figure 3c Flat gas discharge tube according to variant III
Figure 3d Flat gas discharge tube according to variant IV
Figure 3e Flat gas discharge tube according to variant V
Figure 4a Flat gas discharge tube according to variant VI
Figure 4b Flat gas discharge tube according to variant VII
Figure 5 Comparison of the of the insulation distance length on the ceramic and the gap between the electrodes Flat gas discharge tube, shown in Figures 1 and 2, includes a ceramic insulator 1 , which is preferentially Al203, metal electrodes 2 and 3, which are preferably symmetrical and made of copper or copper alloy, a discharge chamber 4 and a graphite coating 5. In general, a gas discharge tube is a hermetically closed discharge chamber, filled with an appropriate gas mixture, which defines the spark-over voltage of the gas discharge tube. Consequently, due to inner part 1c of the ceramic insulator 1 the metal electrodes 2 and 3 have to be bulged, so that a hermetically closed contact between the ceramic 1 and electrodes 2 and 3 is enabled. For this purpose, the ceramic 1 has metallized layers 6 and 6' on the part where the contact with electrodes 2 and 3 is established by soldering.
The flat gas discharge tube includes a ceramic insulator 1 , which is cylindrically shaped and has a wider ring 1a, a narrow ring 1b with metallized layers 6 and 6', narrowed ring 1c and a wider ring 1d, that is formed into a tip a with sides 1d' and 1d" in the direction towards the centre of the ceramic insulator 1. Wherein, the distance between the planes of metallization 6 and 6' is smaller than or equal to the length of sides 1d' and 1d" of the inner wall of the ceramic tip 1. Ceramic 1 is covered with a graphite coating 5. The flat gas discharge tube is hermetically jointed via metallized layers 6 and 6' on the ceramic insulator 1 and soldered joints on metal electrodes 2 and 3, and is filled with an appropriate gas mixture. Electrode 2 has the shape of a circular plate, which has a part 2a soldered to the metallized layer 6 on part 1a of the ceramic insulator 1. From part 2a the electrode 2 is bulged into part 2b, which is narrowed into the middle part 2c. Because the electrode 2 is circular, the bulged part 2b is raised above the part 1c of the ceramic insulator 1. On the upper side of the ceramic insulator 1 is electrode 3 in the shape of a circular plate, which has a part 3a soldered to the metallized layer 6' on part 1a of the ceramic insulator 1. From part 3a the electrode 3 is bulged into part 3b, which is narrowed into the middle part 3c. The height of the gas discharge tube is approximately 3 mm or less, while the diameter of the gas discharge tube is approximately 30 mm. The height of the gas discharge tube is defined with the distance between the lower bulged part 2b of the electrode 2 and the upper bulged part 3b of the electrode 3 or with the height of the outer part 1a of the ceramic 1. The diameter of the gas discharge tube is equal to the diameter of the ceramic insulator 1. Due to very small height of the gas discharge tube there is a big danger of uncontrolled sparks between electrodes 2 and 3, which can be a consequence of a limited insulation distance on the ceramic insulator 1 between electrodes 2 and 3. This problem is solved with the shape of part 1c of the ceramic insulator 1 and bulged part 2b of the electrode 2 and bulged part 3b of the electrode 3, which increases the insulation distance so that an acceptable electrically proper condition is established. Reaction time of the gas discharge tube to overvoltage is reduced with the addition of a graphite coating 5 onto the inner wall of the ceramic 1. Due to the increased insulation distance, the length of the inner wall of the ceramic insulator is also increased, which allows more space for graphite coating 5 even at very small distances between electrodes 2 and 3.
Flat gas discharge tube according to variant I includes a ceramic insulator 11 , which is cylindrically shaped and has a ring 11a that is widened into a wider ring 11b. Ring 11a with metallized layers 16 and 16' on the ceramic insulator 11 is hermetically jointed via metallized layers 16 and 16' on the ceramic insulator 11 and soldered joints on the part of metal electrodes 12 and 13, and is filled with an appropriate gas mixture. Electrode 12 has the shape of a circular plate, which has a part 12a soldered to the metallized layer 16 of the part 11a of the ceramic insulator 11. From part 12a the electrode 12 is bulged into part 12b, which is further narrowed into middle part 12c. Because the electrode 12 is circular, the bulged part 12b is raised above the part 11c of the ceramic insulator 11. On the upper side of the ceramic insulator 11 is electrode 13 in the shape of a circular plate, which has part 13a soldered to the metallized layer 16' of layer 11a of the ceramic insulator 11. From part 13a the electrode is bulged into part 13b, which is further narrowed into middle part 13c.
Flat gas discharge tube according to variant II includes a ceramic insulator 21 , which is cylindrically shaped and has a ring 21a, with is widened into a wider ring 21 b, which is formed into a tip in the direction towards the centre of the ceramic insulator 21. Ring 21a with metallized layers 26 and 26' on the ceramic insulator 21 is hermetically jointed via metallized layers 26 and 26' on the ceramic insulator 21 and soldered joints on the part of metal electrodes 22 and 23, and is filled with an appropriate gas mixture.
Flat gas discharge tube according to variant III includes a ceramic insulator 31 , which is cylindrically shaped and has a ring 31a, which is narrowed into a ring 31b and is then widened into a wider ring 31c, which is formed into a tip in the direction towards the centre of the ceramic insulator 31. Ring 31a with metallized layers 36 and 36' on the ceramic insulator 31 is hermetically jointed via metallized layers 36 and 36' on the ceramic insulator 31 and soldered joints on the part of metal electrodes 32 and 33, and is filled with an appropriate gas mixture. Flat gas discharge tube according to variant IV includes a ceramic insulator 41 , which is cylindrically shaped and has a ring 41a, which is formed into a tip 41 b in the direction towards the centre of the ceramic insulator 41. Ring 41a with metallized layers 46 and 46' on the ceramic insulator 41 is hermetically jointed via metallized layers 46 and 46' on the ceramic insulator 41 and soldered joints on the part of metal electrodes 42 and 43, and is filled with an appropriate gas mixture.
Flat gas discharge tube according to variant V includes a ceramic insulator 51 , which is cylindrically shaped and has a ring 51a, which is narrowed into part 51b, which is then formed into a tip 51c in the direction towards the centre of the ceramic insulator 51. Ring 51a has metallized rings 56 and 56'.
Flat gas discharge tube according to variant VI includes a ceramic insulator 61 , which is cylindrically shaped and has a ring 61a, which is narrowed into ring 61 b and narrowed into 61c and widened into ring 61 d, which is formed into a tip in the direction towards the centre of the ceramic insulator 61. Ring 61a with metallized layers 66 and 66' on the ceramic insulator 61 is hermetically jointed via metallized layers 66 and 66' on the ceramic insulator 61 and soldered joints on the part of metal electrodes 62 and 63, and is filled with an appropriate gas mixture. According to this variant the weakening of the ceramic (61) can be observed, which allows detection of mechanical damage of the flat gas discharge tube. Flat gas discharge tube according to variant VII includes a ceramic insulator 71 , which is cylindrically shaped and has an outer ring 71a, which is narrowed before the middle ring 71 b, which is further narrowed and finally forms a tip 71c in the direction towards the centre of the ceramic insulator 71. This variant of the ceramic insulator allows visual detection of damage of the gas discharge tube. It is known that the gas discharge tube in the case of mechanical overload, for example fall from a height, can begin to leak, resulting in altered gas mixture inside the chamber. It is common that upon impact invisible cracks form on the ceramics, which are invisible to the naked eye, therefore damaged gas discharge tubes are often used in further processes. Such damage can only be detected by using an appropriate electric measurement. In the case of part 71a on the outer edge of the ceramics 71 , the edge is weakened and breaks off after an impact. As a result, users can see the defect at a glance, and do not use the gas discharge tube that exhibits mechanical damage. The effect of ceramic insulators with elongated insulation distance is depicted in Figure 4, where letter L denotes the distance between both electrodes, letter L1 denotes insulation pathway on the inner side of the ceramic insulator and letter L2 denotes insulation pathway on the outer side of the ceramic insulator. Distance L and insulation pathways L1 and L2 are indicated with dots, wherein the lengths are defined with the sum of all sides. The flat gas discharge tube according to the invention is characterized in that the lengths L1 and L2 are significantly longer than length L.

Claims

Claims
1. Flat gas discharge tube, which includes a ceramic insulator, two metal electrodes, gaseous filling and graphite coating, characterized in that the ceramic insulator is cylindrically shaped and has a wider ring, a narrow ring with metallized layers and a wider ring, that is formed into a tip in the direction towards the centre of the ceramic insulator, wherein the distance between the planes of metallization is smaller than or equal to the length of the inner wall of the ceramic tip; that the insulation distance on the ceramic insulator between the electrodes is increased due to the shape of the ceramic insulator and the shape of the electrodes.
2. Flat gas discharge tube according to claim 1 , characterized in that it includes ceramic insulator (1), which is cylindrically shaped and has a wider ring (1a), a narrow ring (1 b) with metallized layers (6 and 6'), a narrowed ring (1c) and an wider ring (1d) that is formed into a tip a with sides (1d' and 1d") in the direction towards the centre of the ceramic insulator (1); that the distance between the planes of metallization (6 and 6') is smaller than or equal to the length of sides (1c' and 1c") of the inner wall of the ceramic (1) tip; that a graphite coating is applied to the ceramic (1); that the whole is assembled with hermetical jointing via metallized layers (6 and 6') on the ceramic insulator (1) and soldered joints on the part of metal electrodes (2 and 3) and is filled with an appropriate gas mixture; that the electrode (2) has the shape of a circular plate, which has a part (2a) soldered to the metallized layer (6) of the part (1a) of the ceramic insulator (1); that from part (2a) the electrode (2) is bulged into part (2b), which is narrowed into middle part (2c); that the electrode (2) is circularly shaped and that the bulged part (2b) is raised above the part (1c) of the ceramic insulator (1); that on the upper side of the ceramic insulator (1) an electrode (3) in the shape of a circular plate is placed, which has part (3a) soldered to the metallized layer (6') of part (1a) of the ceramic insulator (1); that from part (3a) the electrode (3) is bulged into part (3b), which is narrowed into middle part (3c); that the height of the gas discharge tube is defined with the distance between the lower bulged part (2b) of the electrode (2) and the upper bulged part (3b) of the electrode (3) or with the height of the outer part (1a) of the ceramic (1); that the diameter of the gas discharge tube is equal to the diameter of the ceramic insulator (1).
3. Flat gas discharge tube according to claim 1 , characterized in that it includes a ceramic insulator (11), which is cylindrically shaped and has a ring ( 1a), which is widened into a wider ring (11b); that the ring (1 a) is hermetically jointed via metallized layers (16 and 16') on the ceramic insulator (11) and soldered joints on the part of metal electrodes (12 and 13) and is filled with an appropriate gas mixture.
4. Flat gas discharge tube according to claim 1 , characterized in that it includes a ceramic insulator (21), which is cylindrically shaped and has a ring (21a), which is widened into a wider ring (21b), which is formed into a tip in the direction towards the centre of the ceramic insulator (21); that the ring (21a) is a hermetically jointed via metallized layers (26 and 26') on the ceramic insulator (21) and soldered joints on the part of metal electrodes (22 and 23) and is filled with an appropriate gas mixture.
5. Flat gas discharge tube according to claim 1 , characterized in that it includes a ceramic insulator (31), which is cylindrically shaped and has a ring (31a), which is narrowed into a ring (31b), then widened into a wider ring (31c), which is formed into a tip in the direction towards the centre of the ceramic insulator (31); that the ring (31a) is hermetically jointed via metallized layers (36 and 36') on the ceramic insulator (31) and soldered joints on the part of metal electrodes (32 and 33) and is filled with an appropriate gas mixture.
6. Flat gas discharge tube according to claim 1 , characterized in that it includes a ceramic insulator (41), which is cylindrically shaped and has a ring (41a), which is formed into a tip (41b) in the direction towards the centre of the ceramic insulator (41); that the ring (41a) is hermetically jointed via metallized layers (46 and 46') on the ceramic insulator (41) and soldered joints on the part of metal electrodes (42 and 43) and is filled with an appropriate gas mixture.
7. Flat gas discharge tube according to claim 1 , characterized in that it includes a ceramic insulator (51), which is cylindrically shaped and has a ring (51 a), which is narrowed into part (51b), which is then formed into a tip (51c) in the direction towards the centre of the ceramic insulator (51).
8. Flat gas discharge tube according to claim 1 , characterized in that it includes a ceramic insulator (61), which is cylindrically shaped and has a ring (61 a), which is narrowed into a ring (61b) and further narrowed into a ring (61c) and widened into a ring (61 d), which is formed into a tip in the direction towards the centre of the ceramic insulator (61); that the ring (61a) is hermetically jointed via metallized layers (66 and 66') on the ceramic insulator (61) and soldered joints on the part of metal electrodes (62 and 63) and is filled with an appropriate gas mixture; that the weakening of the ceramic (61) allows detection of mechanical damage.
9. Flat gas discharge tube according to claim 1 , characterized in that it includes a ceramic insulator (71), which is cylindrically shaped and has an outer ring (71a), which is narrowed before the middle ring (71b), which is further narrowed and then shaped into a tip (71c) in the direction towards the centre of the ceramic insulator (71); that this design of ceramic insulator allows visual detection of damage of the gas discharge tube.
10. Flat gas discharge tube according to any claim from 1 to 9, characterized in that the height of the gas discharge tube is approximately 3 mm or less, and the diameter of the gas discharge tube is approximately 30 mm.
PCT/SI2014/000019 2013-04-08 2014-04-03 Flat gas discharge tube WO2014168589A1 (en)

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SI201300088A SI24350A (en) 2013-04-08 2013-04-08 Flat gas discharger

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016149553A1 (en) * 2015-03-17 2016-09-22 Bourns, Inc. Flat gas discharge tube devices and methods
CN110400667A (en) * 2018-04-24 2019-11-01 成都铁达电子股份有限公司 A kind of low natural capacity piezoresistor
EP3686913A4 (en) * 2017-09-18 2021-10-27 Nuctech Company Limited Anode target, ray light source, computed tomography device, and imaging method

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Publication number Priority date Publication date Assignee Title
DE977529C (en) * 1952-07-04 1966-11-24 Elek Scher App Sprecher & Schu Spark gap with pre-ionization through auxiliary glow gaps for surge arresters
EP1995837A2 (en) 2007-05-22 2008-11-26 Jensen Devices AB Gas discharge tube
US20100156264A1 (en) 2007-06-21 2010-06-24 Juergen Boy Device and Module for Protecting Against Lightning and Overvoltages

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE977529C (en) * 1952-07-04 1966-11-24 Elek Scher App Sprecher & Schu Spark gap with pre-ionization through auxiliary glow gaps for surge arresters
EP1995837A2 (en) 2007-05-22 2008-11-26 Jensen Devices AB Gas discharge tube
US20100156264A1 (en) 2007-06-21 2010-06-24 Juergen Boy Device and Module for Protecting Against Lightning and Overvoltages

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016149553A1 (en) * 2015-03-17 2016-09-22 Bourns, Inc. Flat gas discharge tube devices and methods
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