# US 10,767,862 B2 · Flame rod

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- Number: US 10,767,862 B2
- Document ID: US10767862B2
- Status: Granted
- Kind: B2
- Application number: 16/030,920
- Filed: 2018-07-10
- Published: 2019-01-17
- Granted: 2020-09-08
- Earliest claimed: 2017-07-12
- Assignees: Rinnai Corporation
- Applicants: Rinnai Corporation
- Inventors: Takashi Ojiro; Kazuyuki Akagi; Masaru Takeuchi; Yoshinari Iwata; Yoshiaki Miyajima
- Web page: https://patentgrep.com/patent/US10767862B2

## CPC

- F23N 5/12: using ionisation-sensitive elements, i.e. flame rods
- F23N 2241/02: Space-heating
- F23N 2241/04: Heating water
- F23N: REGULATING OR CONTROLLING COMBUSTION (control devices specially adapted for combustion apparatus in which combustion takes place in a fluidised bed of fuel or other particles F23C10/28; condition responsive controls for regulating combustion in domestic stoves with open fires for solid fuel F24B1/187)

## Abstract

A flame rod (1) including: a rod portion (11) made of a metal material containing aluminum; and a protective cover layer (21) containing a cover material having high conductivity and high heat resistance, wherein the protective cover layer (21) covers a surface of an insertion portion (11A) of the flame rod (11), and the protective cover layer (11) has a thickness of 0.002 mm or more and less than 0.1 mm.

## Claims

### Claim 1

A flame rod comprising:
a rod portion made of a metal material containing aluminum; and
a protective cover layer containing a cover material having high conductivity and high heat resistance, wherein
the protective cover layer covers a surface of at least an insertion portion of the rod portion, the insertion portion being inserted into flame,
the protective cover layer has a thickness of 0.002 mm or more and less than 0.1 mm, and
the rod portion has a groove extending from the insertion portion to a non-insertion portion on the surface thereof, the non-insertion portion being disposed outside the flame.

### Claim 2 (depends on 1)

The flame rod according to claim 1, wherein
the cover material of the protective cover layer contains lanthanum-strontium-manganese oxide.

### Claim 3 (depends on 2)

The flame rod according to claim 2, further comprising an alumina layer and an alumina-manganese compound layer in order from a rod portion side at an interface between the rod portion and the protective cover layer.

### Claim 4

A flame rod comprising:
a rod portion made of a metal material containing aluminum;
a protective cover layer containing a cover material having high conductivity and high heat resistance, the cover material containing lanthanum-strontium-manganese oxide; and
an alumina layer and an alumina-manganese compound layer in order from a rod portion side at an interface between the rod portion and the protective cover layer, wherein
the protective cover layer covers a surface of at least an insertion portion of the rod portion, the insertion portion being inserted into flame, and
the protective cover layer has a thickness of 0.002 mm or more and less than 0.1 mm.

### Claim 5 (depends on 4)

The flame rod according to claim 4, wherein
the rod portion has a groove extending from the insertion portion to a non-insertion portion on the surface thereof, the non-insertion portion being disposed outside the flame.