US3763838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetor having a heat pipe for vaporizing fuel
Assignee: Shell USA Inc
•
Filing: 1971-12-23
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Granted: 1973-10-09
•
Expires: 1991-12-23
Abstract
Abstract A fuel vaporizing system for spark ignition internal combustion engines wherein a heat pipe filled with a narrow-range boiling point fluid is disposed to transfer heat from a heat zone to a vaporizing zone. The liquid fuel is vaporized in the vaporizing zone prior to being mixed with air.
Inventors
- 👤 R Lindsay
- 👤 A Thomas
- 👤 I Finlay
- 👤 J Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:06
CPC Classifications
F; F02; F02M; F02M31/00; F02M31/02; F02M31/16; F02M31/18; F02M31/005; F28; F28D; F28D15/00; F28D15/02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
155 words
A liquid fuel vaporizing device for a spark ignition engine comprising: at least one heat pipe, said heat pipe being in the form of a sealed vessel; a narrow-range boiling point heat transfer fluid, said fluid being disposed in said sealed vessel; said heat pipe being disposed so that the liquid phase of the fluid collects in a heat-receiving zone, the vapor phase of the fluid being arranged to condense in a heat transfer zone where heat is required to vaporize liquid fuel upstream of the point where the fuel is mixed with the main stream of combustion air for sAid engine; the heat-receiving portion of said heat pipe being disposed to extend into the exhaust manifold of the engine with the outer surface of said sealed vessel in contact with the exhaust gas of the engine; and a fuel conduit disposed in heat transfer relationship with the heat transfer zone of the heat pipe.
Claim 2
Dependent Claim
155 words
A liquid fuel vaporizing device for a spark ignition engine comprising: at least one heat pipe, said heat pipe being in the form of a sealed vessel; a narrow-range boiling point heat transfer fluid, said fluid being disposed in said sealed vessel; said heat pipe being disposed so that the liquid phase of the fluid collects in a heat-receiving zone, the vapor phase of the fluid being arranged to condense in a heat transfer zone where heat is required to vaporize liquid fuel upstream of the point where the fuel is mixed with the main stream of combustion air for sAid engine; the heat-receiving portion of said heat pipe being disposed to extend into the exhaust manifold of the engine with the outer surface of said sealed vessel in contact with the exhaust gas of the engine; and a fuel conduit disposed in heat transfer relationship with the heat transfer zone of the heat pipe.
Claim 3
Dependent Claim
33 words
A device as claimed in claim 1, in which the heat pipe is provided with additional cooling means which are arranged to remove heat from the vapor phase of the heat transfer fluid.
Claim 4
Dependent Claim
36 words
A device as claimed in claim 1 in which the inner surface of the heat pipe is lined with a wick-like structure for transporting the heat transfer fluid when in the liquid phase of capillary action.
Claim 5
Dependent Claim
28 words
The device of claim 1 in which the heat pipe contains a quantity of gas which is non-condensable within the intended range of operation of the heat pipe.
Claim 6
Dependent Claim
18 words
The device of claim 1 in which the heat pipe is formed by a plurality of individual pipes.
Claim 7
Dependent Claim
44 words
The device of claim 1 and in addition a secondary air duct communicating with said fuel conduit so that the fuel can be vaporized in the presence of a secondary stream of air prior to said fuel mixing with said mainstream of combustion air.
Claim 8
Dependent Claim
41 words
The device of claim 6, and in addition a main air duct for supplying the mainstream of combustion air, said main air duct converging until it combines with said secondary air duct whereafter said combined main and secondary air ducts diverge.
Claim 9
Dependent Claim
27 words
The device of claim 1 wherein the liquid phase present in the heat pipe occupies less than 40 percent of the total volume of the last pipe.
Claim 10
Dependent Claim
20 words
The device of claim 1 in which the heat transfer fluid has a boiling point of between 100*C and 300*C.
Claim 11
Dependent Claim
13 words
The device of claim 9 in which the heat transfer fluid is 2-octanol.
Claim 12
Dependent Claim
13 words
The device of claim 9 in which the heat transfer fluid is decane.
Claim 13
Dependent Claim
13 words
The device of claim 9 in which the heat transfer fluid is tetralin.
Claim 14
Dependent Claim
28 words
The device of claim 1 and in addition a return passageway formed in said heat pipe for returning condensate form said heat transfer zone to said liquid zone.
Claim 15
Independent Claim
70 words
A method for vaporizing the liquid fuel supplied to a spark-ignition internal combustion engine comprising: boiling an intermediate fluid enclosed in a sealed container in a high temperature region; using the latent heat of condensation of the vapor of said fluid to vaporize a fuel charge for the engine prior to its admixture with the mainstream of combustion air, and admixing said vaporized fuel and the mainstream of combustion air.
Claim 16
Independent Claim
70 words
A method for vaporizing the liquid fuel supplied to a spark-ignition internal combustion engine comprising: boiling an intermediate fluid enclosed in a sealed container in a high temperature region; using the latent heat of condensation of the vapor of said fluid to vaporize a fuel charge for the engine prior to its admixture with the mainstream of combustion air, and admixing said vaporized fuel and the mainstream of combustion air.
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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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |