# US 4,392,811 A · Gasifying device for liquid fuel burner

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- Number: US 4,392,811 A
- Document ID: US4392811A
- Status: Granted
- Kind: A
- Application number: 06/234,432
- Filed: 1981-02-13
- Granted: 1983-07-12
- Earliest claimed: 1980-02-16
- Assignees: Dainichi Kogyo Co., Ltd.
- Inventors: Takao Ito
- Web page: https://patentgrep.com/patent/US4392811A

## CPC

- F23K 5/22: Vaporising devices (in burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space F23D11/44)
- F23D 11/448: {heated by electrical means}
- F23D 11/46: Devices on the vaporiser for controlling the feeding of the fuel
- F23K: FEEDING FUEL TO COMBUSTION APPARATUS (fuel feeders specially adapted for fluidised bed combustion apparatus F23C10/22)
- F23D: BURNERS

## Abstract

A gasified liquid fuel combustion apparatus for supplying a gaseous mixture of air and a gasified liquid fuel to a burner for combustion. The apparatus includes a gasifying device which comprises two spaced concentric tubes having a concentric inner tube therein. An electric heater is positioned in the space between the inner tube and the two concentric tubes and heats a chamber between the concentric tubes. Fuel is admitted to the lower rear end of the chamber and is gasified and then exits the gasifier through a nozzle connected to the forward end of the chamber. A solenoid controlled valve is operable to open and close the nozzle.

## Claims

### Claim 1

A gasified liquid fuel combustion apparatus for supplying a gaseous mixture of air and a gasified liquid fuel ejected from a nozzle to a burner for combustion, said apparatus including a gasifying device comprising:
(a) a gasifier including two concentric tubes having front and rear ends and defining a chamber and sealed at least at the rear end thereof and having a concentric inner tube disposed therein, said gasifier and inner tube being in sealed communicating relation with a nozzle head provided concentrically with and at the front end of said inner tube, said nozzle head including a nozzle;
(b) a valve rod provided in said inner tube and having at its front end a valve needle cooperable with said nozzle;
(c) a movable core provided at the rear end of said valve rod;
(d) a solenoid provided at the rear end of said inner tube and operable to move said movable core;
(e) an electric heater provided in a concentric space between said gasifyer and said inner tube;
(f) a fuel delivery pipe connected to the lower rear end of said gasifier and adapted to deliver fuel to the rear end of said gasifier chamber;
(g) means causing said fuel to travel in a helical path around and along said chamber from its rear end to its front end; and
(h) means connecting the front end of said gasifier chamber to said nozzle.

### Claim 2 (depends on 1)

An apparatus according to claim 1, wherein said movable core is disposed inside said inner tube, and said solenoid is disposed on the outside of the rear end of said inner tube.

### Claim 3 (depends on 2)

An apparatus according to claim 2, wherein said inner tube is provided at the rear end thereof with a fixed core, and a compression spring is provided between said movable core and said fixed core.

### Claim 4 (depends on 1)

An apparatus according to claim 1, wherein said means causing said fuel to travel in a helical path includes heat-conductive packing provided in said gasifier chamber formed between said concentric tubes of said gasifier.

### Claim 5 (depends on 4)

An apparatus according to claim 4, wherein said heat-conductive packing is formed from metal wires or metal ribbons.

### Claim 6 (depends on 4)

An apparatus according to claim 4, wherein said heat-conductive filler is arranged in a helix in said chamber.

### Claim 7 (depends on 1)

An apparatus according to claim 1, wherein said connecting means connects the upper forward end of said chamber to said nozzle head for delivering gasified fuel to said nozzle.

### Claim 8 (depends on 1)

An apparatus according to claim 1, wherein said gasifier includes temperature responsive means controlling delivery of fuel to said fuel delivery pipe in response to the temperature in said chamber.