Patent US3741710A successfully refreshed from Google Patents.
US3741710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion control valve means and system
Assignee: Individual
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Filing: 1971-12-20
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Granted: 1973-06-26
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Expires: 1991-12-20
Abstract
Abstract Combination control apparatus including means for supplying air to a furnace, means for supplying gas to the furnace, means responsive to heat demand for varying the air flow and means responsive to the rate of air flow for adjusting the rate of gas flow to maintain a constant fuel/air ratio. Preferably, an air damper or valve is located in an air inlet pipe to a blower and a gas supply pipe is also connected to the inlet pipe adjacent the blower. The blower feeds the mixture into the furnace. A modulating-type pressure regulating valve controls the rate of gas flow and means responsive to air pressure, located between the air valve and the blower, adjusts the modulating valve to maintain an outlet pressure that provides a fuel/air ratio that is substantially constant.
Inventors
- 👤 L Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:21
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/02; F23N1/027; F23N2225/00; F23N2225/08; F23N2225/18; F23N2235/00; F23N2235/02; F23N2235/06; F23N2235/12; F23N2235/20; F23N2235/24; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2521
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
139 words
Combustion control apparatus comprising conduit means for delivering air to a furnace, air flow control means in said conduit means for regulating the rate of air flow according to heat demand, air flow restricting means in said conduit means, gas pressure actuated valve means for delivering gas to said conduit means downstream of said air flow restricting means, said valve means including pressure regulating means and a gas flow restricTing means downstream of said pressure regulating means, temperature responsive means arranged to supply gas to said valve means to open said valve means, and means responsive to air pressure upstream of said air flow restricting means to adjust the gas pressure on said pressure regulating means by bleeding valve actuating gas therefrom to maintain the outlet gas pressure from said pressure regulating means substantially equal to said air pressure.
Claim 2
Dependent Claim
139 words
Combustion control apparatus comprising conduit means for delivering air to a furnace, air flow control means in said conduit means for regulating the rate of air flow according to heat demand, air flow restricting means in said conduit means, gas pressure actuated valve means for delivering gas to said conduit means downstream of said air flow restricting means, said valve means including pressure regulating means and a gas flow restricTing means downstream of said pressure regulating means, temperature responsive means arranged to supply gas to said valve means to open said valve means, and means responsive to air pressure upstream of said air flow restricting means to adjust the gas pressure on said pressure regulating means by bleeding valve actuating gas therefrom to maintain the outlet gas pressure from said pressure regulating means substantially equal to said air pressure.
Claim 3
Dependent Claim
34 words
Combustion control apparatus as defined in claim 1 wherein said air flow control means includes a sensor adapted to sense the temperature of heating fluid heated by the burning of said gas and air.
Claim 4
Dependent Claim
25 words
Combustion control apparatus as defined in claim 1 wherein said conduit means for delivering air includes a blower downstream from said air flow restricting means.
Claim 5
Dependent Claim
147 words
Combustion control apparatus as defined in claim 1 wherein said pressure regulating means includes a movable wall operably connected to a main valve, a pressure chamber on one side of said movable wall and means normally biasing said main valve closed and said wall into said chamber, said temperature responsive means includes a three-way control valve selectively operable to establish communication between the inlet side of said main valve and said pressure chamber or between said chamber and the outlet side of said main valve, said air pressure responsive means includes a pressure regulator valve located between said pressure chamber and the outlet side of said main valve and a diaphragm actuator for said pressure regulator valve being exposed on the valve side thereof to said main valve''s outlet gas pressure and on the other side thereof to air pressure upstream of said air flow restricting means.
Claim 6
Dependent Claim
15 words
The combination defined in claim 4 wherein gas flow to the control valve is restricted.
Claim 7
Dependent Claim
30 words
The combination defined in claim 5 wherein said temperature responsive means includes a remote sensor located in a space the temperature of which is to be controlled by said apparatus.
Claim 8
Dependent Claim
16 words
The combination defined in claim 6 in combination with an igniter controlled by said remote sensor.
Claim 9
Dependent Claim
28 words
The combination of claim 5 in combination with thermostatic means electrically connected to said blower and three-way valve and an igniter also electrically connected to said thermostatic means.
Claim 10
Dependent Claim
29 words
Combustion control apparatus as defined in claim 1 wherein said means for regulating the rate of air flow is valve means located upstream of said air flow restricting means.
Claim 11
Dependent Claim
22 words
Combustion control apparatus as defined in claim 9 wherein said air flow-valve means is controlled by a sensor responsive to heat demand.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |