US 12,218,490 B2
Lightning-protection spark gap
Bernhard Krauss, Berg (DE); Stephan Hierl, Neumarkt (DE); and Uwe Strangfeld, Nuremberg (DE)
Assigned to DEHN SE, Neumarkt i.d.OPf. (DE)
Appl. No. 17/918,298
Filed by DEHN SE, Neumarkt i.d.OPf. (DE)
PCT Filed Nov. 8, 2021, PCT No. PCT/EP2021/080993
§ 371(c)(1), (2) Date Oct. 11, 2022,
PCT Pub. No. WO2022/101149, PCT Pub. Date May 19, 2022.
Claims priority of application No. 102020214136.3 (DE), filed on Nov. 10, 2020.
Prior Publication US 2024/0162689 A1, May 16, 2024
Int. Cl. H01T 4/10 (2006.01); H01T 1/02 (2006.01); H01T 4/04 (2006.01)
CPC H01T 4/10 (2013.01) [H01T 1/02 (2013.01); H01T 4/04 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A lightning-protection spark gap, comprising:
a housing (G);
a first electrode (3a), having a first outer side (Aa) and a first inner side (Ia), and a second electrode (3b), having a second outer side (Ab) and a second inner side (Ib), wherein the first electrode (3a) and the second electrode (3b) diverge from each other;
wherein, between the first inner side (Ia) of the first electrode (3a) and the second inner side (Ib) of the second electrode (3b), an ignition region (Z) and a subsequent propagation region (L) for an arc are formed;
wherein the housing (G) forms an arc chamber (LK), which is arranged between the first and second electrodes (3a, 3b) and which is delimited by a quenching chamber (4); and
wherein, in the housing (G), at least one gas circulation channel (K1) is configured, by means of which a gas flow escaping from the quenching chamber (4) in the event of a lightning stroke can be returned to the arc chamber (LK) via at least one first cut-out (V1; V1′; V1″; V1′″) in the propagation region (L) of the first electrode (3a);
characterized in that
the first cut-out (V1; V1′; V1″; V1′″) is configured asymmetrically with respect to a longitudinal extension of the first cut-out (V1; V1′; V1″; V1′″) in the propagation direction of the arc; and
the first cut-out (V1; V1′; V1″; V1′″), in the propagation direction of the arc, decreases from a first cross-section (Q1) of the first electrode (3a) to a minimum cross-section (QM) of the first electrode (3a) over a first distance (l1; l1′; l1″; l1′″), and increases from the minimum cross-section (QM) of the first electrode (3a) to a second cross-section (Q2) of the first electrode (3a) over a second distance (l2; l2′; l2″; l2′″); and
the first distance (l1; l1′; l1″; l1″) is shorter than the second distance (l2; l2′; l2″; l2′″).