Patent US4238185A successfully refreshed from Google Patents.
US4238185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for a burner
Assignee: TELEGAN Ltd
•
Filing: 1978-05-19
•
Granted: 1980-12-09
•
Expires: 1998-05-19
Abstract
Abstract This invention is a control for a burner enabling it to operate efficiently with very little excess air but providing a main control for the fuel and for the combustion air in response to demand, and an auxiliary control in response to the amount of free oxygen in the products of combustion. The latter quantity can be measured by a zirconia cell, and there are means for controlling its temperature accurately so that the reading is reliable. The controls in response to demand and excess air respectively are applied alternately in a cycle with a period of no control to enable the effect of an adjustment to be established before further control is applied.
Inventors
- 👤 Kenneth Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:26
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/003; F23N5/006; F23N1/00; F23N1/08; F23N1/10; F23N1/105; F23N2233/00; F23N2233/06; F23N2235/00; F23N2235/02; F23N2235/06; F23N2237/00; F23N2237/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
154 words
A burner control system for optimizing the fuel and air supplied to a burner, comprising: a fuel control; an air control responsive to the fuel control; demand responsive means for controlling the fuel control and air control; oxygen sensing means for sensing the amount of oxygen in the products of combustion from the burner and producing an oxygen signal; additional burner control means responsive to the oxygen signal for further adjusting air to the burner to optimize the ratio of fuel to air supplied for combustion; a substantially continuously running timer; and switch means connected with the timer for cyclical operation to first render the demand responsive means operative, then render both the demand responsive means and additional control means inoperative to provide time for stabilization of combustion following operation of the demand responsive means, and then render the additional control means operative for additional adjustment as necessary, and for thereafter repeating the cycle.
Claim 2
Dependent Claim
154 words
A burner control system for optimizing the fuel and air supplied to a burner, comprising: a fuel control; an air control responsive to the fuel control; demand responsive means for controlling the fuel control and air control; oxygen sensing means for sensing the amount of oxygen in the products of combustion from the burner and producing an oxygen signal; additional burner control means responsive to the oxygen signal for further adjusting air to the burner to optimize the ratio of fuel to air supplied for combustion; a substantially continuously running timer; and switch means connected with the timer for cyclical operation to first render the demand responsive means operative, then render both the demand responsive means and additional control means inoperative to provide time for stabilization of combustion following operation of the demand responsive means, and then render the additional control means operative for additional adjustment as necessary, and for thereafter repeating the cycle.
Claim 3
Dependent Claim
22 words
A system as claimed in claim 1 including means for controlling the fuel and the air supply together in a predetermined relationship.
Claim 4
Dependent Claim
17 words
A system as claimed in claim 2 in which the additional control means adjusts the predetermined relationship.
Claim 5
Dependent Claim
66 words
A system as claimed in claim 1 used in combination with a burner having an automatically operated fuel control in response to demand and a linkage for automatically adjusting an air damper as the fuel supply is adjusted, the system including a trim damper controlling the air supply to the air damper, which trim damper is opened or closed in response to the additional control means.
Claim 6
Dependent Claim
26 words
A system as claimed in claim 4 in which the trim damper is upstream of the air damper in an air passage containing the air damper.
Claim 7
Dependent Claim
30 words
A system as claimed in claim 1 in which the additional control means is only operative while the air supply is within a predetermined range of a demanded air supply.
Claim 8
Dependent Claim
20 words
A system as claimed in claim 6 in which means automatically rests the range in response to changing burner load.
Claim 9
Dependent Claim
58 words
A system as claimed in claim 1 in which a burner stack leads from the burner and the oxygen sensing means responsive to the amount of oxygen in the products of combustion comprises a zirconia cell in the burner stack arranged to give an electrical signal representing the amount of oxygen in the exhaust gases in the stack.
Claim 10
Dependent Claim
65 words
A system as claimed in claim 8 including a heater for the zirconia cell arranged to be switched to one or other of two states in dependence on the temperature of the cell so as to heat the cell if the temperature is lower than one limit, and to allow the cell to cool if it is above that limit or above a higher limit.
Claim 11
Dependent Claim
156 words
A burner control system for optimizing the fuel and air supplied to a burner, comprising: a fuel control; an air control responsive to the fuel control; demand responsive means for controlling the fuel control and air control; oxygen sensing means for sensing the amount of oxygen in the products of combustion from the burner and producing an oxygen signal; additional burner control means responsive to the oxygen signal for further adjusting air to the burner to optimize the ratio of fuel to air supplied for combustion; a substantially continuously running timer; and switch means connected with the timer for cyclical operation to first render the demand responsive means operative, then render one of the demand responsive means and additional control means inoperative to provide time for stabilization of combustion following operation of one of the control means, and then render the additional control means operative for additional adjustment as necessary, and for thereafter repeating the cycle.
Claim 12
Dependent Claim
156 words
A burner control system for optimizing the fuel and air supplied to a burner, comprising: a fuel control; an air control responsive to the fuel control; demand responsive means for controlling the fuel control and air control; oxygen sensing means for sensing the amount of oxygen in the products of combustion from the burner and producing an oxygen signal; additional burner control means responsive to the oxygen signal for further adjusting air to the burner to optimize the ratio of fuel to air supplied for combustion; a substantially continuously running timer; and switch means connected with the timer for cyclical operation to first render the demand responsive means operative, then render one of the demand responsive means and additional control means inoperative to provide time for stabilization of combustion following operation of one of the control means, and then render the additional control means operative for additional adjustment as necessary, and for thereafter repeating the cycle.
References Cited (Backward Citations)
US3404836A
Cited
US3503553A
Cited
US3549089A
Cited
US3616274A
Cited
US3947217A
Cited
DE2461565A1
Cited
FR2304034A1
Cited
US4150939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |