CN101764356B - High power metal ceramic gas discharge tube for power system overvoltage protection - Google Patents
High power metal ceramic gas discharge tube for power system overvoltage protection Download PDFInfo
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- CN101764356B CN101764356B CN200910107556XA CN200910107556A CN101764356B CN 101764356 B CN101764356 B CN 101764356B CN 200910107556X A CN200910107556X A CN 200910107556XA CN 200910107556 A CN200910107556 A CN 200910107556A CN 101764356 B CN101764356 B CN 101764356B
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Abstract
A high power metal ceramic gas discharge tube for power system overvoltage protection relates to a gas discharge tube which is used for avoiding the overvoltage caused by lightning protection and electromagnetic pulse prevention in electronic equipment and power system and avoiding the damage of the electronic equipment caused by overvoltage operation. The gas discharge tube comprises an outer electrode, an inner electrode and a metalized ceramic ring, wherein the inner electrode contains a cavity which extends in the cylinder of the outer electrode, the metalized ceramic ring is arranged between the cylinder opening of the outer electrode and the cylinder opening, extending in the outer electrode, of the inner electrode, the tightness sealing is performed to form a sealed gas discharge gap which is filled with inert gas; the central position of top wall of the cavity which is capable of holding gas is provided with a center air hole, the bottom of the cavity is provided with a plurality of gas inlets, and the center air hole and the gas inlets are used to form a gas circulation path between the discharging gap and the cavity. The effects of the invention are as follows: the alternating current power supply system can be automatically closed when the voltage crosses zero after the overvoltage is clustered, the volume of the gas discharge tube is small while the power is large, the performance is excellent and the production cost is low.
Description
Technical field
Overvoltage of the present invention relates to be applied to prevent in electronic equipment, the power-supply system to be struck by lightning, electromagnetic pulse being brought and switching overvoltage be to the hurtful discharge tube of electronic equipment, especially refers to the ceramet gas discharge tube that a kind of overvoltage can reliably be closed during the AC power supply system voltage zero-cross later voluntarily, volume is little and through-current capability is big.
Background technology
Overvoltage that ceramet gas discharge tube prevents to be struck by lightning in electronic equipment, power-supply system, electromagnetic pulse is brought and switching overvoltage have a wide range of applications in to the infringement that electronic equipment caused.We can say; The size of problem, volume size and through-current capability that can overvoltage reliably close during the AC power supply system voltage zero-cross later voluntarily is three big indexs of measurement ceramet gas discharge tube performance and advanced technology degree; The ceramet gas discharge tube that the three is advanced, the ceramet gas discharge tube that can reliably close voluntarily when gathering three aspect advanced technologies for overvoltage all over the body AC power supply system voltage zero-cross later in other words, volume is little and through-current capability is big just can be applicable to the power-supply system overvoltage protection.Up to the present; Ceramet gas discharge tube is only outstanding in performance in a certain respect; Perhaps overvoltage can reliably be closed during the AC power supply system voltage zero-cross later voluntarily, and perhaps volume is little, and is perhaps high-power; Comprehensively do not integrate or central combination, thereby do not have the all-round excellent product of a kind of performance.For example:
1, Chinese patent discloses the application of CN1588718A " no afterflow ceramet gas discharge tube "; This invention has designed inside and outside electrode; And interior electrode is stretched in the external electrode and is held around by external electrode; Constitute the airtight discharging gap that inert gas is arranged through silver-copper brazing alloy respectively between inside and outside electrode and the metallized ceramic, a plurality of air admission holes that are shaped on centre bore on the interior electrode and are communicated with it, the discharging gap between air admission hole, centre bore and internal and external electrode has constituted the gas circulation flow path.When this invention punctures because of Lightning Over-voltage; In discharging gap, form electric arc; Under the effect of the electromagnetic force of electron stream that arc temperature, ionized gas produce and ion flow, the inert gas in the discharging gap is volatile outwards to be expanded by the center, gap, in discharging gap, is formed centrally low-pressure area; The gas that outwards expands simultaneously is through the inert gas gas between electrode and the metallized ceramic sheet in the compression of the gap between interior electrode and external electrode; Make this regional inert gas flow to centre bore by a plurality of air admission holes rapidly, owing to the variation of the inert gas that does not have ionization in the pore because of hole pipe resistance, the inert gas that is flowed to centre bore by a plurality of air admission holes is accelerated and sprays to discharging gap in centre bore; Electrical discharge arc does not have at this that electric arc is elongated rapidly under jet-stream wind effect of ionization; The voltage of keeping discharge raises rapidly, until arc extinction, thereby cuts off the afterflow of ceramet gas discharge tube.Though the invention solves the difficult problem that the ceramet gas discharge tube overvoltage can reliably be closed during the AC power supply system voltage zero-cross later voluntarily; But its centre bore only form of a pore exists, and its volume is little; The gas that can flow through is restricted; Thereby during lightning discharge, to electric arc hold absorb limited, thereby the elongation of electric arc also is restricted.In addition, this invention volume is big, and the electrode difficulty of processing is big, and manufacturing cost is high.Thereby in practical application, need further to improve.
2, Chinese patent discloses the patent of CN2807463 " miniature high-power metallic ceramic gas discharge tube "; This invention has designed inside and outside electrode; And interior electrode is stretched in the external electrode and is held around by external electrode, constitutes airtight discharging gap through silver-copper brazing alloy respectively between inside and outside electrode and the metallized ceramic.When heavy-current discharge; The immense pressure that the inert gas expansion produces is converted into the uniform tension to the pressure and the outermost cylindricality metallization face of the top annular metallization face of metallized ceramic; Because the compression strength of metallized ceramic is it perpendicular to tens times of the pull-off strength of metallization face; Simultaneously to bear the pulling force that is parallel to metallization face be that it bears tens times perpendicular to the pressure of metallization face to ceramic metallized layer, so the through-current capability of this patent will improve more than 10 times than the ceramet gas discharge tube of existing comparable size.Though this patent through-current capability is big, and is simple in structure, volume is little,, the not solution of problem that overvoltage can reliably be closed during the AC power supply system voltage zero-cross later voluntarily.
Summary of the invention
The ceramet gas discharge tube that the present invention is intended to overcome prior art is only in that performance is outstanding in a certain respect; Perhaps overvoltage can reliably be closed during the AC power supply system voltage zero-cross later voluntarily; Perhaps volume is little; Perhaps powerful deficiency through comprehensive integration or central combination, is released the all-round excellent high power metal ceramic gas discharge tube for power system overvoltage protection product of a kind of performance.
To achieve these goals, accomplish above-mentioned task, high power metal ceramic gas discharge tube for power system overvoltage protection of the present invention adopts following technical scheme:
Construct high power metal ceramic gas discharge tube for power system overvoltage protection of the present invention; Comprise external electrode, interior electrode and metallization porcelain ring, external electrode is the cylindrical shell that an end opening other end has the end, and interior electrode comprises a cavity body; Said cavity body puts in the cylindrical shell of external electrode; Between the nozzle position that the nozzle position and the interior electrode of external electrode puts in external electrode, metallization porcelain ring is installed is also carried out the air-tightness sealing-in, constitutes airtight gas discharge gap and also fill betwixt with inert gas; The centre of roof that can hold the said cavity body of inert gas has a centre porosity; Have a plurality of air admission holes in the bottom of said cavity body; Said centre porosity is communicated with said cavity body with the discharging gap at top; Said air admission hole is communicated with the discharging gap of the sidepiece between said cavity body and the inside and outside electrode, between discharging gap and cavity body, forms the gas circulation flow path through centre porosity and air admission hole.
Technique scheme is further set forth:
The said cavity body of interior electrode is made up of the head and the afterbody of interior electrode.
Said head and said afterbody are through the scolder welding.
Said head is the cylindrical body that there are the end and lower ending opening in the top.
Said afterbody comprises discoid body and the rhabodoid that is overall shaped into one.
The discoid body of said afterbody and the lower ending opening of said head are fastenedly connected and constitute said cavity body.
The radial symmetric setting of the head of the interior electrode in said air admission hole edge, and: the bottom that said air admission hole pierces said cavity body sidewall is the bottom of said head side wall, and perhaps, the diapire that said air admission hole pierces said cavity body is the discoid body of said afterbody.
The external diameter coupling of the said rhabodoid of the internal diameter of metallization porcelain ring and the said afterbody of interior electrode, weld to realize the air-tightness sealing-in with scolder the internal diameter coupling junction of the external diameter of metallization porcelain ring and external electrode.
The centre of the bottom surface of the said discoid body of the said afterbody of interior electrode is protrusion one bulge loop downwards.
In the junction, nozzle position of metallization porcelain ring and external electrode, and weld with the sealing-in of realization air-tightness with scolder in the metallization porcelain ring and the junction of the said bulge loop of the said discoid body of the said afterbody of interior electrode.
High power metal ceramic gas discharge tube for power system overvoltage protection of the present invention is compared with prior art, and its beneficial effect is:
One of which gathers that overvoltage can reliably be closed during the AC power supply system voltage zero-cross later voluntarily, volume is little and high-power for all over the body, and the performance of ceramet gas discharge tube that has solved prior art is only more excellent in a certain respect, and in the not good problem of others.
1., when the present invention punctures because of Lightning Over-voltage, in discharging gap, form electric arc because the spacing minimum of the discharging gap between that one side of the end face of the interior electrode external electrode relative with it, this discharging gap at first discharges.The top of centre porosity becomes the center of this discharging gap; Under the effect of the electromagnetic force of electron stream that arc temperature, ionized gas produce and ion flow, the inert gas in the discharging gap is volatile outwards to be expanded by this discharging gap center, in this discharging gap, is formed centrally low-pressure area; Inert gas in the sidewall spacers in the inert gas that outwards expands simultaneously compresses from top to bottom between electrode and external electrode; This regional gas is flowed in the cavity body by a plurality of air admission holes rapidly, because the volume of cavity body is big, the centre porosity of cavity body is in low-pressure area in addition; From the air admission hole to the cavity body to the centre porosity pressure drop; The unionized inert gas that is flowed to cavity body by a plurality of air admission holes is easy to be accelerated and spray to discharging gap in centre porosity, electrical discharge arc electric arc under the air-flow effect that does not have ionization of this injection is elongated rapidly, and the voltage of keeping discharge raises rapidly; Until arc extinction, thereby extinguish ceramet gas discharge tube.Because the volume of cavity body is big, can hold the inert gas that does not have ionization of capacity, thereby electric arc is elongated easily, thereby the overvoltage of the present invention better effects if of reliably closing voluntarily during the AC power supply system voltage zero-cross later.
2., the through-current capability of ceramet gas discharge tube is big, promptly discharging current is big, gas tension is also big.The size of the through-current capability of ceramet gas discharge tube is mainly relevant with the orientation of the joint face of inside and outside electrode with metallization porcelain ring.Among the present invention; When heavy-current discharge; The immense pressure that gas expand to produce be converted into to the pressure of the top annular metallization face of metallized ceramic and along the outside uniform tension of tubular metallization face; Because the compression strength of metallized ceramic is far longer than its tensile strength; Simultaneously ceramic metallized layer bears the pulling force that is parallel to metallization face and is far longer than its pressure perpendicular to the metallization face, so through-current capability of the present invention improves than the ceramet gas discharge tube of existing comparable size greatly, has little, the high-power characteristics of volume.
3., the volume of ceramet gas discharge tube size is relevant with its discharging current size that can bear, discharging current is big, gas tension is big, the hyperthermia radiation of electric arc is also big to the destruction of the porcelain ring that metallizes.Through-current capability of the present invention is big, still, the immense pressure that inert gas expand to produce be converted into to the pressure of the top annular metallization face of metallized ceramic and along the outside uniform tension of tubular metallization face.Simultaneously, because the path of discharging current does not have near metallized ceramic, the hyperthermia radiation of electric arc is limited to the influence of metallization porcelain ring.Therefore, the present invention is under equal through-current capability, and volume can be done very for a short time, is convenient to use in the lightning-protection module structure in lightning protection boxes such as power supply.
Its two, production cost of the present invention is low.
1., the present invention's porcelain ring that metallizes is little with the connection area of inside and outside electrode, thereby expensive silver-copper brazing alloy uses fewly, and material cost is reduced.
2., interior electrode of the present invention can use inexpensive ordinary metallic material to make.
3., simple in structure, be convenient to processing, the machining period cost is low.
Its three, purposes is wide, overvoltage of can in electronic equipment, power-supply system, prevent to be struck by lightning, electromagnetic pulse being brought and switching overvoltage are used in to the infringement that electronic equipment caused.
Description of drawings
Fig. 1 is cutaway drawing of the present invention (embodiment one, and air admission hole pierces the bottom of cavity body sidewall).
Fig. 2 is the profile of the embodiment one corresponding with Fig. 1.
Fig. 3 is cutaway drawing of the present invention (embodiment two, and air admission hole pierces the diapire of said cavity body).
Fig. 4 is the profile of the embodiment two corresponding with Fig. 3.
Fig. 5 is cutaway drawing of the present invention (embodiment three, and the centre porosity that is positioned at the cavity body roof of electrode enlarges, and whole roof of the cavity body of electrode becomes centre bore in it).
Fig. 6 is the profile corresponding with Fig. 1.
Fig. 7 is interior electrode sketch map.
Among the figure: 1, external electrode; 2, interior electrode; 21, head; 22, afterbody; 221, discoid body; 2211, bulge loop; 222, rhabodoid; 23, cavity body; 24, centre porosity; 25, air admission hole; 3, metallization porcelain ring; 4, discharging gap; 5, scolder.
Embodiment
Below, introduce the embodiment of the utility model in conjunction with accompanying drawing.
As shown in the figure; High power metal ceramic gas discharge tube for power system overvoltage protection of the present invention; Comprise external electrode 1, interior electrode 2 and metallization porcelain ring 3, external electrode 1 is the cylindrical shell that an end opening other end has the end, and interior electrode comprises a cavity body 23; Said cavity body 23 puts in the cylindrical shell of external electrode 1; Between the nozzle position that the nozzle position and the interior electrode 2 of external electrode 1 puts in external electrode 1, metallization porcelain ring 3 is installed is also carried out the air-tightness sealing-in, constitutes airtight gas discharge gap 4 and also fill betwixt with inert gas; The centre of roof that can hold the said cavity body 23 of gas has a centre porosity 24; Have a plurality of air admission holes 25 in the bottom of said cavity body 23; Said centre porosity 24 is communicated with said cavity body 23 with the discharging gap 4 at top; Said air admission hole 25 is communicated with the discharging gap 4 of the sidepiece between said cavity body 23 and interior electrode 2, the external electrode 1, forms the gas circulation flow paths 23 of discharging gap 4 and cavity body through centre porosity 24 and air admission hole 25.The neglecting actual needs greatly of its centre porosity 24 and deciding, the maximum in addition can make in the whole roof of cavity body of electrode become centre bore 24 (Fig. 5,6).When centre porosity was big, gas wherein was accelerated and sprays to discharging gap more easily, and electric arc elongates rapider, made the better effects if of ceramet gas discharge tube discharge quenching.
The said cavity body 23 of interior electrode 2 is made up of the head 21 and the afterbody 22 of interior electrode 2.
Said head 21 passes through scolder 5 fastening welding with said afterbody 22.Said scolder 5 can be a silver-copper brazing alloy.
Said head 21 has the cylindrical body of the end and lower ending opening for the top.
Said afterbody 22 comprises discoid body 221 and the rhabodoid 222 that is overall shaped into one.
The discoid body 221 of said afterbody 22 welds through scolder 5 with the lower ending opening place of said head 21, constitutes said cavity body 23.Said scolder 5 can be a silver-copper brazing alloy.
Said air admission hole 25 certainly, also we can say along the radial symmetric setting of the head 21 of interior electrode 2, the radial symmetric setting of the afterbody 22 of the interior electrode 2 in edge.And: the bottom that said air admission hole 25 pierces said cavity body 23 sidewalls is the bottom (Fig. 1, Fig. 3) of said head 21 sidewalls, and perhaps, the diapire that said air admission hole 25 pierces said cavity body 23 is the discoid body 221 (Fig. 2, Fig. 4) of said afterbody 22.
The external diameter coupling of the said rhabodoid 222 of the internal diameter of metallization porcelain ring 3 and the said afterbody 22 of interior electrode 2, the external diameter of metallization porcelain ring 3 and the internal diameter coupling of external electrode 1.
The centre of the bottom surface of the said discoid body 221 of the said afterbody 22 of interior electrode 2 is protrusion one bulge loop 2211 downwards; Certainly; The external diameter of the little said discoid body 221 on it of the external diameter of this bulge loop 2211; The metallization porcelain ring 3 and the contact-making surface of the bottom surface of the said discoid body 221 of the said afterbody 22 of interior electrode 2 are diminished, under the prerequisite that guarantees other requirement, can save expensive silver-copper brazing alloy.
In the nozzle position junction of metallization porcelain ring 3 with external electrode 1, reach at metallization porcelain ring 3 and carry out the air-tightness sealing-in with scolder 5 with the junction of the said bulge loop 2211 of the said discoid body 221 of the said afterbody 22 of interior electrode 2, said scolder 5 can be a silver-copper brazing alloy.
The above only is preferred embodiment of the present invention, is not that technical scope of the present invention is done any restriction.The technical staff of the industry; Under the inspiration of present technique scheme; Can make some distortion and revise, every foundation technical spirit of the present invention all still belongs in the scope of technical scheme of the present invention above any modification, equivalent variations and modification that embodiment did.
Claims (6)
1. high power metal ceramic gas discharge tube for power system overvoltage protection comprises external electrode (1), interior electrode (2) and metallization porcelain ring (3), and external electrode (1) is the cylindrical shell that there is the end on the bottom end opening top; It is characterized in that: interior electrode comprises a cavity body (23); Said cavity body (23) puts in the cylindrical shell of external electrode (1); At the nozzle position of external electrode (1) and put between the interior electrode (2) at said nozzle position of external electrode (1) and metallization porcelain ring (3) is installed and is carried out the air-tightness sealing-in, constitutes airtight gas discharge gap (4) and also fill betwixt with inert gas; The centre of roof that can hold the said cavity body (23) of inert gas has a centre porosity (24); Have a plurality of air admission holes (25) in the bottom of said cavity body (23); Said centre porosity (24) is communicated with said cavity body (23) with the discharging gap (4) at top; Said air admission hole (25) is communicated with the discharging gap (4) of the sidepiece between said cavity body (23) and interior electrode (2) and the external electrode (1), between discharging gap (4) and cavity body (23), forms the gas circulation flow path through centre porosity (24) and air admission hole (25).
2. high power metal ceramic gas discharge tube for power system overvoltage protection according to claim 1; It is characterized in that: the said cavity body (23) of interior electrode (2) is made up of the head (21) and the afterbody (22) of interior electrode (2); Head (21) has the cylindrical body of the end and bottom end opening for the top; Said afterbody (22) comprises discoid body (221) and the rhabodoid (222) that is overall shaped into one; Head (21) welds through scolder (5) with afterbody (22), and the discoid body (221) of said afterbody (22) constitutes said cavity body (23) with the bottom end opening of said head (21) through scolder (5) welding.
3. high power metal ceramic gas discharge tube for power system overvoltage protection according to claim 2; It is characterized in that: said air admission hole (25) is along the radial symmetric setting of the head (21) of interior electrode (2); Or the radial symmetric setting of the afterbody (22) of the interior electrode in edge (2), and said air admission hole (25) pierces said cavity body (23) sidewall; Perhaps, said air admission hole (25) pierces the discoid body (221) that the diapire of said cavity body (23) is said afterbody (22).
4. high power metal ceramic gas discharge tube for power system overvoltage protection according to claim 2; It is characterized in that: the external diameter coupling of the said rhabodoid (222) of the internal diameter of metallization porcelain ring (3) and the said afterbody (22) of interior electrode (2), the external diameter of metallization porcelain ring (3) and the internal diameter of external electrode (1) coupling.
5. high power metal ceramic gas discharge tube for power system overvoltage protection according to claim 2 is characterized in that: the centre of the bottom surface of the said discoid body (221) of the said afterbody (22) of interior electrode (2) is protrusion one bulge loop (2211) downwards.
6. high power metal ceramic gas discharge tube for power system overvoltage protection according to claim 5; It is characterized in that:, reach in the metallization porcelain ring (3) and the junction of the said bulge loop (2211) of the said discoid body (221) of the said afterbody (22) of interior electrode (2) and carry out the air-tightness welding with scolder (5) in the junction, nozzle position of metallization porcelain ring (3) with external electrode (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910107556XA CN101764356B (en) | 2009-06-02 | 2009-06-02 | High power metal ceramic gas discharge tube for power system overvoltage protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910107556XA CN101764356B (en) | 2009-06-02 | 2009-06-02 | High power metal ceramic gas discharge tube for power system overvoltage protection |
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| CN101764356A CN101764356A (en) | 2010-06-30 |
| CN101764356B true CN101764356B (en) | 2012-02-15 |
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| CN105762049B (en) * | 2016-04-22 | 2018-11-27 | 中国电子科技集团公司第十二研究所 | A kind of high voltage inflatable collector on travelling-wave tubes |
| CN111029907B (en) * | 2019-12-09 | 2020-12-25 | 西安交通大学 | Main electrode structure for flexible direct current transmission and preparation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4866562A (en) * | 1988-01-26 | 1989-09-12 | Tii Industries, Inc. | Self-contained air gap assembly |
| CN2807463Y (en) * | 2005-06-03 | 2006-08-16 | 曾献昌 | Mimitype large power cermet gas discharge tube |
| CN100353625C (en) * | 2004-08-17 | 2007-12-05 | 曾献昌 | No-follow curren metal ceramic gas discharge tube |
| CN201438603U (en) * | 2009-06-02 | 2010-04-14 | 东莞市新铂铼电子有限公司 | High-power metal-ceramic gas discharge tube used for overvoltage protection of power system |
-
2009
- 2009-06-02 CN CN200910107556XA patent/CN101764356B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4866562A (en) * | 1988-01-26 | 1989-09-12 | Tii Industries, Inc. | Self-contained air gap assembly |
| CN100353625C (en) * | 2004-08-17 | 2007-12-05 | 曾献昌 | No-follow curren metal ceramic gas discharge tube |
| CN2807463Y (en) * | 2005-06-03 | 2006-08-16 | 曾献昌 | Mimitype large power cermet gas discharge tube |
| CN201438603U (en) * | 2009-06-02 | 2010-04-14 | 东莞市新铂铼电子有限公司 | High-power metal-ceramic gas discharge tube used for overvoltage protection of power system |
Non-Patent Citations (1)
| Title |
|---|
| JP昭59-198683A 1984.11.10 |
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