Patent US3795476A successfully refreshed from Google Patents.
US3795476A
Expired / Lapsed
US
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Combustion control apparatus
Assignee: Honeywell Inc
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Filing: 1972-11-06
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Granted: 1974-03-05
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Expires: 1992-11-06
Abstract
Abstract Combustion control apparatus for a gas furnace wherein a dual thermostat senses the furnace water temperature to turn on the gas and to then modulate air flow in accordance with heat demand. A diaphragm gas valve has a pressure regulator therein that responds to the air pressure to adjust the diaphragm valve to maintain a substantially constant fuel/air ratio.
Inventors
- 👤 L Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:11
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/02; F23N1/025; F23D; F23D14/00; F23D14/46; F23D14/60; F23N2221/00; F23N2221/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
Combustion control apparatus, for a heating system having conduit means for delivering air to a furnace, air flow control means in said conduit means for adjusting the rate of air flow and constructed to always provide at least a minimum air flow and air flow restricting means in said conduit means, comprising: means for delivering fuel to said conduit means at a position downstream of said air flow restricting means, said fuel delivering means including on-off control means and pressure regulating control means responsive To fuel outlet pressure and a fuel flow restricting means in a portion of said fuel delivering means downstream of said pressure regulating control means, means responsive to air pressure upstream of said air flow restricting means to adjust the loading on said pressure regulating control means to maintain the outlet fuel pressure from said fuel delivering means substantially equal to said air pressure, and means responsive to a condition of the heating system for controlling the operation of said on-off control means and then adjusting said air flow control means in accordance with heat demand.
Claim 2
Dependent Claim
180 words
Combustion control apparatus, for a heating system having conduit means for delivering air to a furnace, air flow control means in said conduit means for adjusting the rate of air flow and constructed to always provide at least a minimum air flow and air flow restricting means in said conduit means, comprising: means for delivering fuel to said conduit means at a position downstream of said air flow restricting means, said fuel delivering means including on-off control means and pressure regulating control means responsive To fuel outlet pressure and a fuel flow restricting means in a portion of said fuel delivering means downstream of said pressure regulating control means, means responsive to air pressure upstream of said air flow restricting means to adjust the loading on said pressure regulating control means to maintain the outlet fuel pressure from said fuel delivering means substantially equal to said air pressure, and means responsive to a condition of the heating system for controlling the operation of said on-off control means and then adjusting said air flow control means in accordance with heat demand.
Claim 3
Dependent Claim
39 words
Combustion control apparatus as defined in claim 1 wherein said heating system has an air blower between said furnace and the air conduit where the fuel enters, so that said pressure regulating control means is adjusted by subatmospheric pressures.
Claim 4
Dependent Claim
35 words
Combustion control apparatus as defined in claim 1 wherein said condition responsive means has first and second control means with one controlling said on-off control means and the other controlling said air flow control means.
Claim 5
Dependent Claim
17 words
The combination of claim 3 wherein said air flow control means includes a modulating type of motor.
Claim 6
Dependent Claim
44 words
The combination of claim 3 wherein said first control means operates at one preselected condition of said system and said second control means operates at a second preselected condition of said system indicative of a need for a larger supply of fuel and air.
Claim 7
Dependent Claim
28 words
The combination of claim 5 wherein said first control means is a three-way valve and said fuel delivering means includes a diaphragm valve controlled by said three-way valve.
Claim 8
Dependent Claim
15 words
The combination of claim 6 wherein said pressure regulating means also controls said diaphragm valve.
Claim 9
Dependent Claim
19 words
Combustion control apparatus as defined in claim 1 wherein said condition responsive means has a single condition sensing means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |