US3840323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuously adjustable controls for oil burners
Assignee: Individual
•
Filing: 1973-05-14
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Granted: 1974-10-08
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Expires: 1993-05-14
Abstract
Abstract Continuously adjustable oil burner controls which include an electromagnetic metering valve in the fuel oil return line, the metering valve determining the supply of fuel oil to the atomizer nozzle of the burner as a function of the coil current which determines the throttling effect of the metering valve and thus the pressure in the fuel oil supply line. The latter also controls the air intake of a combustion air blower.
Inventors
- 👤 O Eckerle
- 👤 R Jung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:49
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0644; F16K31/0655; F16K31/0658; F23; F23K; F23K5/00; F23K5/02; F23K5/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
265 words
In an oil burner system adapted for the continuous combustion of fuel oil with air, a control device for adjusting the combustion rate of the burner comprising in combination: a fuel oil pump connected to an oil reservoir, said pump being driven by a motor at a substantially constant speed, thereby supplying a substantially even flow of oil to the system; a combustion air blower being similarly driven at a substantially constant speed, thereby supplying a flow of combustion air to the system; a burner head including an atomizer nozzle by means of which the fuel oil and combustion air are mixed and combusted; a fuel oil supply line leading from said pump to the atomizer nozzle, including a bypass junction in said line; a fuel oil return line leading from said bypass junction to the fuel oil reservoir; an electromagnetic metering valve in said return line for adjustably throttling the oil flow therein so as to determine an adjustable fuel oil supply pressure and flow rate in the oil supply line; means for adjustably pre-setting the throttling action of the metering valve independently of other adjustments in the system by adjusting its electric current; an air supply line leading from the outlet side of said blower to the atomizer nozzle; and means for adjustably throttling the air flow at the intake side of said blower so as to adjust the rate of air flow in response to said adjustable fuel oil supply pressure in such a way that the rate of air flowing through the blower is increased as the oil supply pressure increases.
Claim 2
Dependent Claim
265 words
In an oil burner system adapted for the continuous combustion of fuel oil with air, a control device for adjusting the combustion rate of the burner comprising in combination: a fuel oil pump connected to an oil reservoir, said pump being driven by a motor at a substantially constant speed, thereby supplying a substantially even flow of oil to the system; a combustion air blower being similarly driven at a substantially constant speed, thereby supplying a flow of combustion air to the system; a burner head including an atomizer nozzle by means of which the fuel oil and combustion air are mixed and combusted; a fuel oil supply line leading from said pump to the atomizer nozzle, including a bypass junction in said line; a fuel oil return line leading from said bypass junction to the fuel oil reservoir; an electromagnetic metering valve in said return line for adjustably throttling the oil flow therein so as to determine an adjustable fuel oil supply pressure and flow rate in the oil supply line; means for adjustably pre-setting the throttling action of the metering valve independently of other adjustments in the system by adjusting its electric current; an air supply line leading from the outlet side of said blower to the atomizer nozzle; and means for adjustably throttling the air flow at the intake side of said blower so as to adjust the rate of air flow in response to said adjustable fuel oil supply pressure in such a way that the rate of air flowing through the blower is increased as the oil supply pressure increases.
Claim 3
Dependent Claim
86 words
An oil burner control device as defined in claim 1, wherein: the electromagnetic metering valve includes a field coil and an axially movable armature inside the coil, the magnetic field of the coil biasing the armature toward a flow throttling position with a force that increases with increasing coil current; the metering valve further including a stationary pole core which cooperates with the movable armature to create the throttling action of the valve; and the valve adjustment controlling means includes means for adjusting said coil current.
Claim 4
Dependent Claim
104 words
An oil burner control device as defined in claim 2, wherein: the movable armature has a generally flat throttling surface facing the pole core; the pole core has a cooperating flat throttling seat facing the throttling surface of the armature, the seat area being bounded by a relief groove whose diameter is considerably smaller than the diameter of the armature; and the path of the fuel oil return line through the metering valve includes a central entry bore through the pole core to its throttling seat and one or more radially spaced exit channels in the pole core which communicate with the relief groove.
Claim 5
Dependent Claim
45 words
An oil burner control device as defined in claim 3, wherein: the metering valve armature includes a peripheral skirt which surrounds its throttling surface and extends toward the pole core so as to deflect the oil flow toward the latter and into the exit channels.
Claim 6
Dependent Claim
69 words
An oil burner control device as defined in claim 1, further including: a pressure check valve in the fuel oil supply line and means for biasing the check valve toward its closed position against the fuel oil flow, the valve biasing means being so calibrated that the check valve remains closed, when less than a predetermined supply pressure is established in the supply line upstream of the check valve.
Claim 7
Dependent Claim
40 words
An oil burner control device as defined in claim 5, wherein: the check valve is a ball-type back pressure valve arranged between the supply line bypass point and the atomizer nozzle; and the valve biasing means is a compression spring.
Claim 8
Dependent Claim
64 words
An oil burner control device as defined in claim 5, wherein: the check valve is a plunger valve which includes a moving plunger; anD the valve biasing means is a spring which engages one end of the plunger, urging the latter into its closed position against the supply pressure in the fuel oil supply line which impinges on the plunger from the opposite end.
Claim 9
Dependent Claim
166 words
An oil burner control device as defined in claim 7, wherein: the burner head includes a bypass-type atomizer nozzle to which the supply line feeds fuel oil, the bypass junction of the supply line being part of said atomizer nozzle; the plunger valve is arranged in the oil supply line between the fuel oil pump and said bypass point, and further includes a pressure relief line between it and the fuel oil reservoir; the fuel oil supply line and the valve plunger define a first closing overlap in the closed valve position and the pressure relief line and the valve plunger define a second, larger closing overlap in the same closed valve position; and the valve biasing means is so calibrated that the valve plunger displacement is less than said first closing overlap as long as the oil supply pressure determined by the metering valve is below a predetermined value, and is more than said second closing overlap when the supply pressure exceeds a predetermined value.
Claim 10
Dependent Claim
79 words
An oil burner control device as defined in claim 1, wherein: the combustion air blower includes a blower housing and an air intake opening defined by said housing; and the air flow throttling means is a clappet valve at the air intake opening, the clappet valve including a means for biasing it toward its closed position, and a hydraulic cylinder means for progressively opening it against the biasing means, as the pressure in the fuel oil supply line increases.
Claim 11
Dependent Claim
27 words
An oil burner control device as defined in claim 9, wherein: the hydraulic cylinder means includes a control line connecting it to the fuel oil supply line.
Claim 12
Dependent Claim
35 words
An oil burner control device as defined in claim 9, wherein: the hydraulic cylinder means includes a control line connecting it to the fuel oil return line upstream of the throttling means in the latter.
Claim 13
Dependent Claim
50 words
An oil burner control device as defined in claim 1, wherein: the fuel oil pump is a positive displacement pump producing a constant oil flow rate independent of the counter-pressure to be overcome in the supply line; and the combustion air blower is rotatably coupled with the fuel oil pump.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |