US4434772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion mixture generator for internal combustion engines
Assignee: Pierburg GmbH
•
Filing: 1983-07-08
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Granted: 1984-03-06
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Expires: 2003-07-08
Abstract
Abstract A carburettor or other combustible mixture generator 1 has a mixture chamber 3 surrounded by a tubular wall 2 which has an inner skin 9 and an outer skin 10 with an annular heating chamber 11 between them. Heating fluid such as exhaust gas or heated engine cooling water flows through the chamber 11 from an inlet 12 to an outlet 13 and so heats the inner skin 9. A fuel metering device 6, 7 directs the fuel on to the surface of the heated skin 9 and thus causes the fuel to be evaporated within the mixing chamber 3 upstream of a throttle 4. This greatly improves the uniformity of the mixture and the uniformity of its distribution through an inlet downstream of the throttle 4.
Inventors
- 👤 Gunter Hartel
- 👤 Werner Schiele
- 👤 Armin Schurfeld
- 👤 Valerio Bianchi
- 👤 Anwar Abidin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:44
CPC Classifications
F; F02; F02M; F02M15/00; F02M15/02; F02M19/00; F02M19/08; F02M19/088; F02M31/00; F02M31/02; F02M31/12; F02M31/135; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
228 words
In a combustible mixture generator for an internal combustion engine, said generator comprising an axially extending upwardly arranged tubular wall having an upper end and a lower end and defining a mixture chamber therein, means for heating said tubular wall over at least part of the axial length thereof between the upper end and lower end, a flap-shaped throttle member, means mounting said throttle member at the lower end of said tubular wall and fuel metering means for directing fuel into said mixture chamber at the upper end thereof, said tubular wall comprising a double wall heat exchanger jacket defining an annular chamber within said double wall, means for conducting heating fluid through said annular chamber, the improvement wherein said double wall extending axially from adjacent said fuel metering means substantially to said throttle member with the throttle member located between the upper and lowr ends of said annular chamber, said fuel metering means is located between upper and lower ends of said tubular wall and is operative to direct substantially all of said fuel onto the inner surface of said double wall defining the mixture chamber between said fuel metering means and said throttle member, said double wall comprising an inner and an outer wall and said means for heating said double wall comprises electrical resistance heating material located within the inner wall of said double wall.
Claim 2
Dependent Claim
228 words
In a combustible mixture generator for an internal combustion engine, said generator comprising an axially extending upwardly arranged tubular wall having an upper end and a lower end and defining a mixture chamber therein, means for heating said tubular wall over at least part of the axial length thereof between the upper end and lower end, a flap-shaped throttle member, means mounting said throttle member at the lower end of said tubular wall and fuel metering means for directing fuel into said mixture chamber at the upper end thereof, said tubular wall comprising a double wall heat exchanger jacket defining an annular chamber within said double wall, means for conducting heating fluid through said annular chamber, the improvement wherein said double wall extending axially from adjacent said fuel metering means substantially to said throttle member with the throttle member located between the upper and lowr ends of said annular chamber, said fuel metering means is located between upper and lower ends of said tubular wall and is operative to direct substantially all of said fuel onto the inner surface of said double wall defining the mixture chamber between said fuel metering means and said throttle member, said double wall comprising an inner and an outer wall and said means for heating said double wall comprises electrical resistance heating material located within the inner wall of said double wall.
Claim 3
Dependent Claim
21 words
A generator as claimed in claim 1, in which at least part of said inner wall is composed of PTC material.
Claim 4
Dependent Claim
28 words
A generator as claimed in claim 1, in which said fuel metering means comprises means defining a fuel exit and central pre-atomiser means provided at said fuel exit.
Claim 5
Dependent Claim
64 words
A generator as claimed in claim 1, in which said fuel metering means includes an atomising nozzle, means defining a central fuel exit in said nozzle, means defining an annular gap concentric with said fuel exit and a constriction at said exit for atomising air under elevated pressure to produce velocity vectors of different magnitudes and directions for fuel and air at said exit.
Claim 6
Dependent Claim
39 words
A generator as claimed in claim 4, in which said exit of said atomizing nozzle is disposed substantially centrally of said mixing chamber and is directed in the direction of a main air and fuel flow through said chamber.
Claim 7
Dependent Claim
41 words
A generator as claimed in claim 1, in which said fuel metering means includes means defining an annular duct extending around and communicating with said mixing chamber for the introduction of an annular stream of a pre-mixture into said mixing chamber.
Claim 8
Dependent Claim
22 words
A generator as claimed in claim 6, in which said annular duct is formed in said tubular wall of said mixing chamber.
Claim 9
Dependent Claim
57 words
A generator as claimed in claim 6, further comprising means defining at least one fuel supply duct communicating with said annular duct and means defining at least one air duct which merges tangentially into said annular duct adjacent said fuel duct, and means for supplying supplementary air under elevated pressure to said at least one air duct.
Claim 10
Dependent Claim
36 words
A generator as claimed in claim 6, further comprising porous internal boundary wall means associated with said annular duct, said wall means being permeable to said pre-mixture and communicating said annular duct with said mixing chamber.
Claim 11
Dependent Claim
17 words
A generator as claimed in claim 9, in which said porous wall means is of sintered metal.
Claim 12
Dependent Claim
24 words
A generator as claimed in claim 6, further comprising means defining an annular pre-mixture exit gap communicating said annular duct with said mixture chamber.
Claim 13
Dependent Claim
36 words
A generator as claimed in claim 6, further comprising means defining a plurality of pre-mixture exit ducts communicating said annular duct with said mixture chamber, said pre-mixture exit ducts being uniformly distributed around said mixture chamber.
Claim 14
Dependent Claim
54 words
A generator as claimed in claim 12, in which said exit ducts extend at an angle from said annular duct, said annular duct being integrated into said tubular wall of said mixing chamber, said exit ducts communicating said annular duct with a pre-mixture entry zone of said mixture chamber downstream of said annular duct.
Claim 15
Dependent Claim
28 words
A generator as claimed in claim 13, further comprising means defining pre-mixture exit ports in said tubular wall, said ports communicating said exit ducts with said mixture chamber.
Claim 16
Dependent Claim
30 words
A generator as claimed in claim 13, further comprising means defining an annular pre-mixture groove disposed around said tubular wall, said groove communicating said exit ducts with said mixture chamber.
Claim 17
Dependent Claim
34 words
A generator as claimed in claim 15, further comprising means defining additional groove means extending from said annular pre-mixture groove in a direction parallel to a direction of main mixture flow through said chamber.
Claim 18
Dependent Claim
19 words
A generator as claimed in claim 6, in which said annular duct is disposed upstream of said inner wall.
Claim 19
Dependent Claim
25 words
A generator as claimed in claim 6, in which said annular duct is at least partially surrounded by said annular chamber in said tubular wall.
Claim 20
Dependent Claim
51 words
A generator as claimed in claim 6, further comprising means forming a converging venturi zone in said mixture chamber, said annular duct being disposed in said converging venturi zone, said annular duct communicating with a throat of said venturi zone and being surrounded by said annular chamber of said tubular wall.
Claim 21
Dependent Claim
62 words
A generator as claimed in claim 6, further comprising a flow member disposed radially within said tubular wall, said annular duct being formed in said flow member, means defining an annular air gap between said flow member and said tubular wall, and said annular duct opening outwardly into said annular air gap and means for flowing induction air through said annular gap.
Claim 22
Dependent Claim
36 words
A generator as claimed in claim 20, further comprising means defining a central air passage through said flow member, said central air passage having a relatively large surface area being disposed radially within said annular duct.
Claim 23
Dependent Claim
37 words
A generator as claimed in claim 20, in which a portion of said tubular wall which surrounds said flow member is of greater radial extent than the remainder of said tubular wall which surrounds said mixture chamber.
Claim 24
Dependent Claim
18 words
A generator as claimed in claim 20, in which said flow member is shaped to form pre-atomiser means.
Claim 25
Dependent Claim
19 words
A generator as claimed in claim 20, in which said central passage through said flow member forms venturi means.
Claim 26
Dependent Claim
28 words
A generator as claimed in claim 1, in which said fuel metering means comprises injection nozzle means which is operative to produce an annular conical stream of fuel.
Claim 27
Dependent Claim
15 words
A generator as claimed in claim 1, further comprising means for heating said throttle member.
Claim 28
Dependent Claim
20 words
A generator as claimed in claim 1, in which said inner wall includes portion of material of good thermal conductivity.
Claim 29
Dependent Claim
27 words
A generator as claimed in claim 27, in which said inner wall portion of material of good thermal conductivity includes rib means extending into said mixing chamber.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |