GB2057054A - Combined ignition device and fuel injector - Google Patents
Combined ignition device and fuel injector Download PDFInfo
- Publication number
- GB2057054A GB2057054A GB8026685A GB8026685A GB2057054A GB 2057054 A GB2057054 A GB 2057054A GB 8026685 A GB8026685 A GB 8026685A GB 8026685 A GB8026685 A GB 8026685A GB 2057054 A GB2057054 A GB 2057054A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ignition device
- electrode
- fuel injection
- fuel
- outer electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P21/00—Direct use of flames or burners for ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/26—Starting; Ignition
- F02C7/264—Ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/06—Fuel-injectors combined or associated with other devices the devices being sparking plugs
Abstract
The invention provides a combined ignition device and fuel injection device wherein the ignition device is a plasma flame ignition device. One embodiment comprises a central electrode 1 surrounded by an annular electrode 3, the electrodes being spaced by an insulator 2 and the assembly forming a plasma flame ignition device. An outer member 5 provided with fuel injection orifices 6 surrounds the electrode 3. <IMAGE>
Description
SPECIFICATION
Combined ignition device and fuel injector
The present invention relates to a combined
ignition device and fuel injector.
According to the present invention there is
provided a combined ignition device and fuel
injection device wherein the ignition device is a
plasma flame ignition device.
Preferably two of the electrodes of the plasma
flame ignition device are arranged co-axially and
the fuel injection device is associated with one of
the electrodes.
According to one form of the invention, the
plasma flame ignition device includes a central
electrode surrounded by an outer electrode in
order to define a generally annular gap
therebetween and the fuel injection device is in
the form of one or more orifices provided in a
member surrounding the outer electrode. In an
alternative arrangement the fuel injection device
may be in the form of a central coaxial orifice in
the central electrode. In yet another arrangement
the fuel injection device may be a single annular orifice, for example associated with the outer
electrode. Preferably the electrode with which the
fuel injection device is associated is at earth
potential.
The invention will now be further described, by
way of example, with reference to the
accompanying drawings in which: Fig. 1 is a diagrammatic end view of one
embodiment of combined ignition device and fuel
injector according to the invention,
Fig. 2 is a scrap sectional view through the end
of the device of Fig. 1, and
Fig. 3 is a diagrammatic longitudinal sectional
view of another embodiment of the device
according to the invention.
Referring to Figs. 1 and 2 of the drawings, the
combined ignition device and fuel injector
illustrated comprises a central electrode 1
surrounded by an insulator 2 which is in turn
surrounded by an annular electrode 3. The latter
electrode is spaced from the central electrode 1 by
an annular gap 4 and is itself surrounded by an
outer annular member 5 provided with a series of
fuel injection orifices 6, for example six as shown.
Any other desired number of orifices could be
provided, including a single orifice.
Plasma flame ignition devices are described, for
example, in our Specifications Nos 1310499,
1410471 and 1486560 and 1563205 and the
ignition device included in the present invention functions in the general manner disclosed in those
prior specifications and may employ any of the
configurations disclosed therein which are suitable for use in combination with a fuel injection device.
In the arrangement according to the present
invention, fuel is injected through the fuel injection
orifices so that when the plasma flame ignition
device is fired, the conditions of the fuel air
mixture exposed to the plasma are satisfactory for ensuring the generation of a chemically assisted
plasma flame.
Such a jet of flame has a significantly higher
flame front velocity than that created by other
known igniters and the greater penetration
achieved by such a jet is advantageous in ensuring
adequate combustion of the fuel/air charge in a
combustion chamber.
More specifically as shown in Fig. 2, the fuel
injected through the orifices forms a divergent
spray S of droplets such that the region X is filled
with air, fuel vapour and small droplets of fuel
shortly after injection. If the ignition device is fired
to generate the plasma arc under these conditions,
then a high velocity chemical flame will be
generated along the axis of the device.
The fuel injected may be the only fuel used or
may be ancillary to that employed for the main
combustion. In the latter case, the fuel may be the
same as that employed for the main combustion,
or may be derived from a separate fuel supply
which is different from the fuel employed for the
main combustion.
According to a modification, the fuel injection
device may be in the form of an orifice extending through the central electrode 1. Yet again the fuel
injection device may take the form of an annular gap defined between the electrode 3 and the member 5.
The axis of the orifices 6 need not be parallel to the axis of the electrodes but may be drilled at any angle to the axis of the electrodes to create an asymmetric flame.
Fig. 3 shows a further embodiment of combined ignition device and fuel injector comprising an outer body 10 of steel which surrounds and is co-axial with a central electrode
11, e.g. of copper. The two electrodes are separated by a member 12 of insulating material, which is preferably a ceramic such as alumina. The
outer body 10 includes an externally threaded
portion 13 to enable it to be screwed into a spark
plug aperture or equivalent aperture in an engine
or other device, such as an oil burner, and the
body 10 is then effectively at earth potential.
A fuel passageway 14 extends through the body 10 between a fuel connector 1 5 attached to the periphery of the body and an annular groove
16 formed in an end cap 17 which is screwed onto the end of the body. A plurality of orifices 1 8 are provided through the end cap 1 7 communicating with the annular groove 16, whereby fuel fed to the connector 14 may be injected into a combustion space through the orifices 1 8.
The central electrode 11 is provided with a tip 1 9 of an alloy resistant to spark damage, such as
Inconel 600 (Registered Trade Mark), which is brazed to the electrode 11.
The rear end of the electrode 11 carries a further electrode 20 surrounded by an insulating body 21 and separated from the electrode 11 by an air gap 22.
The device is operated as a plasma flame ignition device in the manner described in the aforementioned specifications and to this end a lower voltage V1 is applied to the electrode 11 via a connector 23 and a higher voltage V2 is applied to the electrode 20 via a connector 24.
This embodiment of combined ignition device and fuel injector is intended for use in applications where fuel is required to be fed in a continuous manner. Thus it may be employed, for example, as a burner of a gas turbine or Stirling engine or as a pilot for a furnace. The device operates in a pulsed mode, the trigger voltage V2 being applied at such a rate, e.g. OHz, that should the flame be extinguished, it will quickly be relit.
The fuel flow through the outer body 10 and round the annulus 16 has a beneficial effect both in cooling the device, particularly the end cap 17, and in heating the fuel so that it vapourizes more readily as it is sprayed from the orifices 18.
Claims (8)
1. A combined ignition device and fuel injection device wherein the ignition device is a plasma flame ignition device.
2. A device as claimed in claim 1, wherein two of the electrodes of the plasma flame ignition device are arranged co-axially and the fuel injection device is associated with one of the electrodes.
3. A device as claimed in claim 2, wherein the plasma flame ignition device includes a central electrode surrounded by an outer electrode in order to define a generally annular gap therebetween and the fuel injection device is in the form of one or more orifices in said outer electrode or in a member surrounding said outer electrode.
4. A device as claimed in claim 2, wherein the plasma flame ignition device includes a central eletrode surrounded by an outer electrode and the fuel injection device is in the form of one or more orifices in the central electrode.
5. A device as claimed in claim 3, wherein the outer electrode includes a fuel passage leading to a gallery provided adjacent the tip of said outer electrode and feeding said one or more orifices, the fuel flow through said outer electrode and said gallery serving to cool the device and also serving to heat the fuel so that it vapourizes more readily as it is sprayed from said orifices.
6. A device as claimed in claim 2, 3, 4 or 5, wherein the electrode with which the fuel injection device is associated is at earth potential.
7. A device as claimed in claim 3, 4 or 5, wherein the or each orifice is formed at a selected angle to the axis of the associated electrode.
8. A combined ignition device and fuel injection device substantially as hereinbefore described with reference to Figs. 1 and 2 or Fig. 3 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8026685A GB2057054B (en) | 1979-08-17 | 1980-08-15 | Combined ignition device and fuel injector |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7928697 | 1979-08-17 | ||
| GB8026685A GB2057054B (en) | 1979-08-17 | 1980-08-15 | Combined ignition device and fuel injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2057054A true GB2057054A (en) | 1981-03-25 |
| GB2057054B GB2057054B (en) | 1983-06-02 |
Family
ID=26272602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8026685A Expired GB2057054B (en) | 1979-08-17 | 1980-08-15 | Combined ignition device and fuel injector |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2057054B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0635636A1 (en) * | 1993-07-12 | 1995-01-25 | Siemens Automotive Corporation | Railplug direct injector/ignitor assembly |
| US5531199A (en) * | 1992-05-11 | 1996-07-02 | United Fuels Limited | Internal combustion engines |
| WO2001065107A1 (en) * | 2000-02-28 | 2001-09-07 | Orbital Engine Company (Australia) Pty Limited | Combined fuel injection and ignition means |
| EP1439302A1 (en) * | 2003-01-17 | 2004-07-21 | Ford Global Technologies, Inc., A subsidiary of Ford Motor Company | Fuel injector and ignition device for an internal combustion engine |
-
1980
- 1980-08-15 GB GB8026685A patent/GB2057054B/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5531199A (en) * | 1992-05-11 | 1996-07-02 | United Fuels Limited | Internal combustion engines |
| EP0635636A1 (en) * | 1993-07-12 | 1995-01-25 | Siemens Automotive Corporation | Railplug direct injector/ignitor assembly |
| WO2001065107A1 (en) * | 2000-02-28 | 2001-09-07 | Orbital Engine Company (Australia) Pty Limited | Combined fuel injection and ignition means |
| US7086376B2 (en) | 2000-02-28 | 2006-08-08 | Orbital Engine Company (Australia) Pty Limited | Combined fuel injection and ignition means |
| EP1439302A1 (en) * | 2003-01-17 | 2004-07-21 | Ford Global Technologies, Inc., A subsidiary of Ford Motor Company | Fuel injector and ignition device for an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2057054B (en) | 1983-06-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920815 |