Heater for melting glass

Patent metadata

Field	Value
Publication number	US-12356511-B2
Application number	US-202217840263-A
Country	US
Kind code	B2
Filing date	Jun 14, 2022
Priority date	Dec 20, 2019
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A heater for melting glass includes: a heating member containing carbon (C) configured to emit heat rays upon power feeding; and a tubular member made of metal configured to have one end closed, and to house the heating member. The heating member includes a first heat generating part and a second heat generating part along an extending axis direction of the heater, and the first heat generating part is arranged at a position closer to the one end of the tubular member than is the second heat generating part. Denoting a unit-length resistance of the first heat generating part along the extending axis direction by X (Ω/m), and denoting a unit-length resistance of the second heat generating part by Y (Ω/m),( 1/30)X<Y<(½)X  Formula (1)is satisfied.

First claim

The invention claimed is:

1. A heater for melting glass, comprising:
a heating member containing carbon (C) configured to emit heat rays upon power feeding; and
a tubular member made of metal configured to have one end closed, and to house the heating member,
wherein the heating member includes a first heat generating part and a second heat generating part along an extending axis direction of the heater, and the first heat generating part is arranged at a position closer to the one end of the tubular member than is the second heat generating part, and
wherein the first heat generating part has a unit-length resistance along the extending axis direction defined by X (Ω/m), the second heat generating part has a unit-length resistance along the extending direction defined by Y (Ω/m), and the unit-length resistances X and Y of the heating member satisfy Formula (1):
( 1/30) X<Y <(½) X.

2. The heater as claimed in claim 1 , wherein one of or both of the first heat generating part and the second heat generating part are formed of a carbon fiber reinforced carbon composite.

3. The heater as claimed in claim 1 , wherein the first heat generating part has a shape selected from among a group consisting of a rod shape, a coil shape, and a hollow cylindrical shape with or without a slit.

4. The heater as claimed in claim 1 , wherein the second heat generating part has a shape different from that of the first heat generating part.

5. The heater as claimed in claim 1 , wherein the first heat generating part and the second heat generating part are arranged to physically contact each other.

6. The heater as claimed in claim 1 , wherein the tubular member is formed of a material containing one or more elements selected from among platinum, tungsten, iridium, rhodium, and molybdenum.

7. The heater as claimed in claim 1 , wherein the tubular member is formed of a material including at least one of platinum or rhodium.

8. The heater as claimed in claim 1 , further comprising:
a cooling member at part of an outer periphery of the tubular member.

9. The heater as claimed in claim 1 , wherein the heater is configured to be capable of controlling an atmosphere inside the tubular member.

10. The heater as claimed in claim 1 , wherein a gas is present between the heating member and the tubular member.

Assignees

• Agc Inc

Inventors

• Maehara Terutaka
• Niwa Akifumi
• Hyodo Shuntaro
• Akita Yukihito
• Enomoto Takashi
• Doi Yoji
• Pauli Roger
• Keen Lawrence

Classifications

• H05B2203/025

  Heaters specially adapted for glass melting or glass treatment · CPC title

• H05B3/40

  Heating elements having the shape of rods or tubes (H05B3/62, H05B3/68, H05B3/78 take precedence) · CPC title

• F27D11/02

  Ohmic resistance heating · CPC title

• C03B5/033 Primary

  by using resistance heaters above or in the glass bath, i.e. by indirect resistance heating · CPC title

• H05B3/82

  Fixedly-mounted immersion heaters · CPC title