# US 5,706,768 A · Zigzag ignition gap arrangement

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- Number: US 5,706,768 A
- Document ID: US5706768A
- Status: Granted
- Kind: A
- Application number: 08/513,975
- Filed: 1996-04-04
- Granted: 1998-01-13
- Earliest claimed: 1993-03-15
- Assignees: Jan .ANG.bom; Bengt G. Tornqvist
- Inventors: Jan .ANG.bom
- Web page: https://patentgrep.com/patent/US5706768A

## CPC

- F02M 21/12: for fuels in pulverised state
- F02B 19/16: Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
- F02B 19/165: {The shape or construction of the pre-combustion chambers is specially adapted to be formed, at least in part, of ceramic material (surface coverings of combustion-gas-swept parts F02B77/02; shaped ceramic products characterised by their composition or ceramic compositions C04B35/00; ceramic material for engine casings F02F7/0087)}
- F02B 45/02: operating on powdered fuel, e.g. powdered coal (operating on fuel containing oxidant F02B45/06)
- F02D 2200/0606: Fuel temperature
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/30: Use of alternative fuels, e.g. biofuels
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The invention relates to an arrangement in such ignition gaps or channels as are used in combustion devices, for example, internal combustion engines, to impart to an injected finely-divided particulate fuel a temperature sufficient for ignition, heat being transferred from the heated walls for the ignition gaps or channels. The novelty of the invention resides in that the ignition gap or gaps are zigzag-shaped or otherwise formed of two or more substantially straight sections connected at an angle to each other.

## Claims

### Claim 1

An ignition gap arrangement for combustion devices, comprising a wall structure having a zigzag shaped channel formed therein for imparting to an injected finely-divided particulate fuel passing through said channel a temperature sufficient for ignition, said wall structure comprising a plurality of plates having substantially inclined through openings and arranged so that the ends of the openings of adjacent plates correspond with each other, the openings of adjacent plates having deviating directions.

### Claim 2 (depends on 1)

The ignition gap arrangement of claim 1 wherein each of the openings has an angular inclination of approximately 20.degree. with respect to a normal axis passing through the plane of the respective plate.

### Claim 3 (depends on 2)

The ignition gap arrangement of claim 2 wherein each of the plates has a thickness of approximately 20 mm.

### Claim 4 (depends on 1, 2, 3)

The ignition gap arrangement of claim 1, 2 or 3 wherein abutting surfaces of adjacent plates are ground and lapped.

### Claim 5 (depends on 4)

The ignition gap arrangement of claim 4 wherein each of the plates comprises a ceramic material.

### Claim 6 (depends on 1, 3)

The ignition gap arrangement of claim 1 or 3 wherein each of two plates positioned at opposite ends of said wall structure has a spherically-domed smoothed end surface.

### Claim 7 (depends on 6)

The ignition gap arrangement of claim 6 further comprising compression means, adapted to engage each spherically-domed smoothed end surface of the two end plates, for compressing the plates, said compression means comprising a gland sealing device, against which the plurality of plates is applied, and means for cooling said plates.

### Claim 8 (depends on 7)

The ignition gap arrangement of claim 7, wherein said compression means further comprises at least one flange device acting on one end of the plates and operable by an external pressure to hold the plates compressed.

### Claim 9 (depends on 1, 2, 3)

The ignition gap arrangement of claim 1, 2 or 3 wherein each of the plates is comprised of a material adapted to withstand a temperature of approximately 1250.degree. C. and an internal pulsating pressure in the range of approximately 1-200 bar.