US3829739A - Ignition device for burner installations - Google Patents

Ignition device for burner installations Download PDF

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Publication number
US3829739A
US3829739A US00387673A US38767373A US3829739A US 3829739 A US3829739 A US 3829739A US 00387673 A US00387673 A US 00387673A US 38767373 A US38767373 A US 38767373A US 3829739 A US3829739 A US 3829739A
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US
United States
Prior art keywords
resistor
incandescent
resistance
capacitor
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00387673A
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English (en)
Inventor
N Andersen
E Hubschmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Danfoss AS
Original Assignee
Danfoss AS
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Filing date
Publication date
Priority claimed from DE19722243120 external-priority patent/DE2243120C2/de
Application filed by Danfoss AS filed Critical Danfoss AS
Application granted granted Critical
Publication of US3829739A publication Critical patent/US3829739A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/22—Details

Definitions

  • Aging of the resistor causes the resistance to increase with a resulting drop in the power input.
  • a capacitor is used in series with the resistor to compensate for the increase in resistance of the resistor as it ages. It is also found that the capacitor causes the resistor to become incandescent more rapidly.
  • the invention relates to an ignition device for burner installations and having an electrically heatable silicon carbide incandescent resistor.
  • the object of the invention is to provide an ignition device of the initially described kind in which the increase in the resistance of the silicon carbide incandescent resistor, caused by aging has only a slight effect upon the incandescence.
  • this object is achieved by connecting the incandescent resistor in series with a capacitor, the capacitance C (in farads) of which is equal to or preferably somewhat greater than wherein W is the effective power (in watts) necessary for the required incandescence temperature, V is the supply voltage (in volts) of the series connection, and w is the cyclic frequency of this supply voltage.
  • a lower value is selected for the hot resistance R of a new ignition resistor than the value U /2N.
  • This rating ensures that an increase in resistance when hot during the life of the device can lead only to an increase and not to a reduction in the power input.
  • the permissible increase in the incandescence temperature determines the extent to which the capacitance of the capacitor should be greater than the above-stated value.
  • FIG. 1 shows a circuit diagram of an ignition device of the invention
  • FIG. 2 shows curves of equal effective power in a resistance capacitance graph relating to this circuit.
  • the ignition device has a mains connection 1, a switch 2 which is actuated by a control means 3, a capacitor 4 and a rod-shaped incandescent resistor 5 made of silicon carbide.
  • the hot resistance R is (f /2 N 220 /2 50 486 ohms) If the point a is considered as the final point after aging for a hot resistance that should have increased 50% during the life of the device, then the hot resistance R of a new incandescent resistor is approximately 360 ohms. This is shown as point b in the graph of FIG. 2. It will be seen that the deviation from the required power of 50 W is very small.
  • R and C will generally be so selected that for a new incandescent resistor a predetermined power N is attained. ln the present case this means that a slightly higher value for capacitance C than the above calculated minimum capacitance is selected. The working point c then lies exactly on the 50 Wcurve.
  • the form of the curves for constant power enable capacitor having pronounced aging characteristics to be used.
  • lf for example a capacitor of approximately 8 ;LF is initially used, then the associated hot resistance R is obtained from the point d in FIG. 2.
  • the capacitance drops to approximately 7p.F during the life of the capacitor, but the hot resistance R of the incandescent resistor at the same time rises again by approximately 50%, then a working point e is obtained.
  • the change of the working point from d to e shows that during use the deviation from the required power of 50 W is only slight.
  • the curve f shows the approximate change in resistance R when the initially cold incandescent resistor heats up.
  • the resistance curve intersects the 50 W curve at the point g.
  • the working point passes briefly into the higher power range. This means that additional heating power is passed to the incandescent resistor during the heating-up period. This leads to incandescence being reached more rapidly than previously.
  • it is important for the capacitance of the capacitor not to be too close to the minimum value defined by the point a.
  • the greatest possible deivations are obtained by using condensers having a considerable decrease in capacity caused by aging.
  • the criterion for a rise above the range is whether the incandescence temperature either drops or rises in an impermissible manner as a result of changes in power during the service life.
  • An oil burner ignition assembly comprising an electric circuit having a silicon carbide incandescent resistor in series with a capacitor, an AC power source for said circuit, said capacitor having a faradic value equal to twice the power input in watts to said resistor for a required incandescent temperature divided by the product of the frequency in radians per second times the voltage of said source squared, the ohmic value of said resistor when new is less than said voltage squared divided by twice said power unit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Resistance Heating (AREA)
  • Control Of Resistance Heating (AREA)
US00387673A 1972-09-01 1973-08-13 Ignition device for burner installations Expired - Lifetime US3829739A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722243120 DE2243120C2 (de) 1972-09-01 Zündvorrichtung für Feuerungen

Publications (1)

Publication Number Publication Date
US3829739A true US3829739A (en) 1974-08-13

Family

ID=5855266

Family Applications (1)

Application Number Title Priority Date Filing Date
US00387673A Expired - Lifetime US3829739A (en) 1972-09-01 1973-08-13 Ignition device for burner installations

Country Status (7)

Country Link
US (1) US3829739A (xx)
JP (1) JPS4963565A (xx)
CH (1) CH550976A (xx)
FR (1) FR2198096B1 (xx)
GB (1) GB1435766A (xx)
NL (1) NL179163C (xx)
SE (1) SE380082B (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058701A (en) * 1974-05-14 1977-11-15 Schoeller & Co. Elektrotechnische Fabrik Gmbh & Co. Glow element arrangement for electric cigarette lighters
US4337498A (en) * 1978-01-27 1982-06-29 Tokai Konetsu Kogyo Co., Ltd. Small ignition device comprising string-like silicon carbide heating element affixed to terminal supports
US4863372A (en) * 1988-06-08 1989-09-05 Channel Products, Inc. Gas ignition apparatus
US20070281263A1 (en) * 2006-05-30 2007-12-06 Johnston Michael R Safety mechanism for a torch

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1451626A1 (de) * 1964-01-31 1969-01-16 Walter Wilhelms Vorrichtung zum UEberwachen von Zuend- und Verbrennungsvorgaengen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058701A (en) * 1974-05-14 1977-11-15 Schoeller & Co. Elektrotechnische Fabrik Gmbh & Co. Glow element arrangement for electric cigarette lighters
US4337498A (en) * 1978-01-27 1982-06-29 Tokai Konetsu Kogyo Co., Ltd. Small ignition device comprising string-like silicon carbide heating element affixed to terminal supports
US4863372A (en) * 1988-06-08 1989-09-05 Channel Products, Inc. Gas ignition apparatus
US20070281263A1 (en) * 2006-05-30 2007-12-06 Johnston Michael R Safety mechanism for a torch
DE102007024924B4 (de) * 2006-05-30 2010-09-23 Irwin Industrial Tool Co. Sicherheitsmechanismus für einen Brenner
US7967601B2 (en) 2006-05-30 2011-06-28 Irwin Industrial Tool Company Safety mechanism for a torch

Also Published As

Publication number Publication date
GB1435766A (en) 1976-05-12
JPS4963565A (xx) 1974-06-20
FR2198096B1 (xx) 1977-08-05
DE2243120B1 (de) 1974-01-31
FR2198096A1 (xx) 1974-03-29
SE380082B (xx) 1975-10-27
CH550976A (de) 1974-06-28
NL179163C (nl) 1986-07-16
NL179163B (nl) 1986-02-17
DE2243120A1 (xx) 1974-01-31
NL7311580A (xx) 1974-03-05

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