# US 10,767,929 B2 · Furnace

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- Number: US 10,767,929 B2
- Document ID: US10767929B2
- Status: Granted
- Kind: B2
- Application number: 15/761,574
- Filed: 2015-11-12
- Published: 2019-02-21
- Granted: 2020-09-08
- Earliest claimed: 2015-10-13
- Assignees: Tsuyoshi Kajitani; Nippon Crucible Co., Ltd.
- Applicants: Tsuyoshi Kajitani; Nippon Crucible Co., Ltd.
- Inventors: Tsuyoshi Kajitani; Kazumi Yoshiguchi
- Web page: https://patentgrep.com/patent/US10767929B2

## CPC

- F27B 3/205: {Burners}
- C22B 7/003: {only remelting, e.g. of chips, borings, turnings; apparatus used therefor}
- F27B 3/04: of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces
- F27B 3/12: Working chambers or casings; Supports therefor
- F27B 3/20: Arrangements of heating devices
- F27B 3/22: Arrangements of air or gas supply devices
- F27B 3/28: Arrangement of controlling, monitoring, alarm or the like devices
- F27D 13/00: Apparatus for preheating charges; Arrangements for preheating charges
- F27D 17/10: Arrangements for using waste heat
- F27D 19/00: Arrangements of controlling devices
- F27D 21/00: Arrangement of monitoring devices; Arrangement of safety devices
- F27D 99/0033: {using burners}
- F27D 21/0028: {Devices for monitoring the level of the melt}
- F27D 2019/0071: {Regulation using position sensors}
- Y02P 10/20: Recycling
- F27B: FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS
- F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A furnace as described in this invention comprises a temperature regulating portion to assist in melting a non-ferrous material, such as an aluminium, and to reserve said material for the subsequent casting or injection molding procedure. The furnace provides a mean to eliminate an oxide, such as iron oxide, which generally floats on the top layer of a molten material inside a melting portion and a heating portion by preventing the flow of said oxide into the temperature regulating portion. A sensor or any detector that can detect the level of the molten material is utilized to measure the surface level of said molten material. A temperature regulating burner, which is a flat flame type, is utilized on the ceiling of the temperature regulating portion in order to prevent any oxidation reaction to occur as well as to reduce the concentration of oxygen inside the portion.

## Claims

### Claim 1

A furnace wherein the furnace comprises the following components:
a furnace wall;
a pre-heating portion comprising a lid with a material insert channel;
a melting portion and an inclined hearth below the pre-heating portion;
a first burner above the inclined hearth;
a heating portion comprising an oxide-eliminating door and a connecting passage, wherein the heating portion is configured to hold a molten material that has been melted by the first burner in the melting portion and that has flowed over the inclined hearth;
a temperature regulating portion for storing the molten material, the temperature regulating portion comprising a temperature regulating burner which emits a flame, wherein the connecting passage has an inclined or curved bottom and wherein the connecting passage allows molten material to flow from the heating portion into the temperature regulating portion;
a separator for forming the connecting passage wherein the separator comprises a lower edge that is located below a liquid surface of the molten material inside the heating portion and a liquid surface of the molten material inside the temperature regulating portion, when there is molten material in the furnace; and
an exit channel for the molten material,
wherein the temperature regulating portion is a closed system, and wherein the temperature regulating burner is configured to control the oxygen concentration in the temperature regulating portion to 0-5%.

### Claim 2 (depends on 1)

The furnace according to claim 1, further comprising a sensor for detecting the level of molten material, wherein the sensor is located in the exit channel.

### Claim 3 (depends on 1)

The furnace according to claim 1, wherein the temperature regulating burner is a flat flame burner.

### Claim 4 (depends on 1)

The furnace according to claim 1 wherein the temperature regulating portion further comprises:
a heat exchanger on one part of the furnace wall or on a ceiling lid.

### Claim 5 (depends on 1)

The furnace according to claim 1 wherein the temperature regulating portion is a closed system without a door.