DE202005012704U1 - Electrode for igniting or monitoring a gas burner comprises two materials one being hard and crack-resistant and the other tough and oxidation-resistant - Google Patents

Abstract

An electrode (3) for igniting or monitoring a gas burner comprises a metal electrode positioned in the flame region of the burner and partly enclosed by an insulating body (4) attached to the burner. The electrode is formed of a hard, crack-resistant material (1) and a second, tough and oxidation layer-resistant material (2).

Description

The The invention relates to an electrode according to the preamble of the patent claim 1.

An electrode of the type mentioned is according to the DE 103 06 702 A1 known. This consists of a metallic electrode which can be positioned in the flame region of the gas burner and partially enclosed by an insulating body which can be fastened to the gas burner. Such electrodes can be used both for igniting and for monitoring a gas burner.

According to "Manual for Heating Technology" (ISBN 3-410-15283-0, 2nd edition, p. 144) "consist of the electrode wires a special steel or nickel alloy for a good life guaranteed at the high electrode temperatures between 800 ° C and 1100 ° C is. Are the electrodes heated above 950 ° C The wire is very brittle become and may not be bent anymore. Electrodes are too the wear parts to count. "

Of the Invention has for its object to provide an electrode, the aging phenomena such as corrosion and embrittlement better resists.

These Task is with an electrode of the type mentioned by solved the features listed in the characterizing part of claim 1 protection.

To The invention is therefore intended that the electrode of a first, hard, creep-resistant and made of a second, tough, oxidation-inhibiting Material is formed.

The The condition "creep-resistant" expresses that the first material has only a slight tendency to settle plastically deform at rest. The second material becomes because after being selected, that it does not form a corrosion layer ("oxidation-inhibiting").

With in other words, the invention consists in forming the electrode from two materials, one offering the required strength and the other guaranteed that the surface the electrode does not corrode.

Other advantageous developments of the electrode according to the invention, in particular the arrangement possibilities of the two materials, are mentioned in the dependent claims.

The electrode according to the invention including their advantageous developments according to the dependent claims below with reference to the drawings of various embodiments explained in more detail.

It each shows in perspective

1 the electrode according to the invention of two materials, which are arranged adjacent to each other and extending in the axial direction of the electrode;

2 the electrode in which the two materials are arranged rotated in the axial direction of the electrode to each other;

3 the electrode in which the oxidation-inhibiting material is formed as a wire which surrounds the creep-resistant material helically; and

4 the electrode in which the oxidation-inhibiting material is formed as a coating, which encloses the creep-resistant material like a coat.

The in the 1 to 4 In principle, the illustrated electrode for igniting or monitoring a gas burner consists of a first metallic electrode 3 , which can be positioned in the flame region of the gas burner and partially by an insulating body attachable to the gas burner 4 is enclosed. This insulation body 4 is formed in a known manner from a good electrical insulating ceramic and attachable to a gas burner carrier plate 5 arranged. In the illustrated embodiments is beyond and in a likewise known manner also a second electrode 6 present, which is preferably also formed in the manner explained below according to the invention.

Essential for all four embodiments is now that the electrode 3 from a first, hard, creep-resistant 1 and a second, tough, oxidation-inhibiting material 2 is formed. This requirement ensures that the electrode is both well protected against corrosion and thus virtually no aging phenomena, and on the other hand that the electrode is still stable enough to withstand mechanical and thermal loads well.

In this case, in all the illustrated embodiments, the two materials 1 . 2 arranged adjacent to each other and extending in the axial direction of the electrode.

In the embodiment according to 1 are the two materials 1 . 2 arranged side by side, so similar to a bimetallic strip.

According to 2 is provided, the two materials 1 . 2 twisted to each other in the axial direction of the electrode. The helical line in 2 represents the material limit.

To 3 is alternatively provided that the oxidation-inhibiting material 2 is designed as a wire, the creep-resistant material 1 encloses helically. This results in a sense to one with an oxidation-free wire 2 wrapped support element 1 ,

A fourth embodiment is according to 4 further, that the oxidation-inhibiting material 2 As Be coating is formed, the creep resistant material 1 encloses like a coat.

With regard to the materials is advantageously provided that the first material 1 from Kanthal APM (see for example http://www.kanthal.com). As second material 2 Finally, Aluchrom Y, Aluchrom YHF, Crofer 22 APU or Nicrofer 6025 HT may be provided.

1

first material

2

second material

3

electrode

4

insulation body

5

support plate

6

second electrode

Claims (10)

An electrode for igniting or monitoring a gas burner, comprising a metallic electrode ( 3 ), which can be positioned in the flame region of the gas burner and partially by an insulating body attachable to the gas burner (US Pat. 4 ), characterized in that the electrode ( 3 ) from a first, hard, creep-resistant ( 1 ) and a second, tough, oxidation-inhibiting material ( 2 ) is formed. Electrode according to Claim 1, characterized in that the two materials ( 1 . 2 ) are arranged adjacent to each other and extending in the axial direction of the electrode. Electrode according to Claim 1 or 2, characterized in that the two materials ( 1 . 2 ) are arranged side by side. Electrode according to Claim 3, characterized in that the two materials ( 1 . 2 ) are arranged rotated in the axial direction of the electrode to each other. Electrode according to one of claims 1 to 3, characterized in that the oxidation-inhibiting material ( 2 ) is formed as a wire, the creep-resistant material ( 1 ) encloses helically. Electrode according to one of claims 1 to 3, characterized in that the oxidation-inhibiting material ( 2 ) is formed as a coating, the creep-resistant material ( 1 ) encloses like a coat. Electrode according to one of Claims 1 to 6, characterized in that the first material ( 1 ) consists of Kanthal APM. Electrode according to one of Claims 1 to 7, characterized in that the second material ( 2 ) optionally consists of Aluchrom Y, Aluchrom YHF, Crofer 22 APU or Nicrofer 6025 HT. Electrode according to one of claims 1 to 8, characterized in that the insulating body ( 4 ) is formed of a ceramic. Electrode according to one of claims 1 to 9, characterized in that the insulating body ( 4 ) on a carrier plate fastened to the gas burner ( 5 ) is arranged.