US3544247A - Fuel burner power failure bridge - Google Patents

Fuel burner power failure bridge Download PDF

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Publication number
US3544247A
US3544247A US778737A US3544247DA US3544247A US 3544247 A US3544247 A US 3544247A US 778737 A US778737 A US 778737A US 3544247D A US3544247D A US 3544247DA US 3544247 A US3544247 A US 3544247A
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US
United States
Prior art keywords
burner
direct current
power
fuel
primary control
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
US778737A
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English (en)
Inventor
James C Blackett
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.)
Honeywell Inc
Original Assignee
Honeywell Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Honeywell Inc filed Critical Honeywell Inc
Application granted granted Critical
Publication of US3544247A publication Critical patent/US3544247A/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
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/22—Pilot burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/02—Fail safe using electric energy accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/04—Fail safe for electrical power failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators

Definitions

  • the present invention also involves connecting a power storage means to the burner primary control means in only certain applications where this type of equipment is desired without adding the burden of cost of this type of equipment to all of the similar equipment that is sold where no power bridging requirement is needed.
  • the size and type of power storage means also can be selected to provide varying capacities so that various lengths of power outages can be accounted for.
  • An alternating current supply line is connected between conductors 10 and 11 to supply conventional alternating current to the disclosed system.
  • Conductor 10 passes through a limit control 12 that is conventially used in fuel burner control systems.
  • the limit 12 in turn is connected to a controller 13 that can be momentary or two position manually operated or can be in the form of a thermostatically operated device.
  • Controller 13 is connected by conductor 14 to a burner primary control means 15 which generally includes relay contact means 16, a direct current power supply means 17, a direct current fan relay 18, and direct current amplifiers and control relays 20.
  • the burner primary control means 15 is of the type disclosed in application Ser. No. 685,193, filed on Nov. 22, 1967 and entitled Burner Control Apparatus with Prepurge Timing by l ames C. Blackett. This burner primary control means is also known as the R4795 as manufactured and sold by Honeywell Inc., Minneapolis, Minn.
  • the conductor 14 is connected to a conductor 21, transformer 22, and conductor 23 which completes the primary energizing circuit for the transformer 22.
  • Conductor 23 is directly connected to the alternating current supply line conductor 11.
  • a fuel burner means is generally disclosed at 25 and includes a fan 26, pilot valve 27, an ignition means 28, a main fuel valve 30, and a ame detector 31.
  • the elements 26, 27, 28, 30 and 31 make up part of a conventional fuel burner means and their individual functions will not be detailed as they are well known in the art.
  • An air switch 32 is connected between a pair of terminals 33 and 34 and is responsive to air being moved by the fan 26.
  • the air switch 32 is conventional and completes a normal and operative fuel burner control system.
  • the flame detector 31 When the fuel is ignited, the flame detector 31 operates through the direct current amplifier and control relays 20 to cause the main valve 30 to beenergized for cornin fact, a matter of a few seconds-.of operation of the burner primary control means 15.
  • the capacitor 41 immediately begins to discharge through the diode 43 to the terminal 34 and intothe burner primary control means to supply the necessary energy to hold the direct current relay 18 and the ⁇ direct current amplifier and control relays in their energized position. Since the diode 43 parallels the impedance or resistor 42', the resistor 42 is not in the circuit during the discharge operation of the capacitor 14.
  • the capacitor 41 is available to supply immediate energy to the burner primary control means 15 in the event of a momentary plete operation of the fuel
  • the direct current power supply means 17 loses its energizing source and the direct current fan relay 18 and the direct current amplifier and control relays 20 Ibecome deenergized. This period of time is very short and can be substantially shorter than the response time of the fuel burner means 25. ilf the power failure between conductors 10 and 11 is only a few cycles p in duration a nuisance shutdown on the fuel burner means occurs. As has been previously mentioned this nuisance type of i shutdown is very undesirable in certain types of applications, particularly process control. In order toavoid this type of nuisance shutdown the direct current power storage means 40 has been added. Its structure and operation will now be described.
  • the power storage means 40 includes a large capacitor 41 connected in series with a parallel combination of a resistor or impedance means 42 and a diode 43.
  • a conductor 44 connects the common connectionof the resistor 42 and the diode 43 torterminal 34, which is connected directly to the directcurrent power supply means 17.
  • the capacitor 41 is connected by conductor 45 to a terminal 46, which is grounded in the burner primary control means 15 and which is common to the direct current power supply means 17.
  • the terminal 46 is utilized for various connections and is normally available on the burner primary control means 15.
  • the operation is as follows.
  • controller 13 indicates that the fuel burner means 25 is to be operated, power is applied to conductor 14 andthe burner primary control means ⁇ 15.
  • the direct current power supply means 17 becomes active and supplies a direct current potential to the direct current fan relay 18 and tenminal 34rwhere the air switch 32 and the conductor 44 are connected.
  • the resistor 42 in the power storage means 40 limits the current drawn into ⁇ the capacitor 41 to a low value thereby avoiding loading down the direct current power supply means 17.
  • the resistor 42 supplies an impedance to limit the charging rate of capacitor 41. Under normal operating conditions the capacitor 41 becomes fully charged after a short period of operation of the burner primary control means 15.
  • Capacitor 41 takes on a full charge bringing it up to the level of the direct current power supply means 17. This charge having been limited bythe impedance of resistor 42 is relatively slow but only takes,
  • a very simple power storage means has lbeen provided which does not load down the direct current power supply means 17 during normal operation and which is immediately available to bridge momentary powerfailures.
  • the selection of the components within the power storage means 40 can be made to bridge varying lengths of power failures by the selection of the size of the capacitor and whether in fact a resistor 42 and diode 43 are ⁇ used.
  • said impedance means includes a parallel combination of a resistor and a diode to allow said capacitor means to beslowly charged from said direct ⁇ current power supply means and rapidly discharged to operate said burner primary control means during a short alternating current supply line failure.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
US778737A 1968-11-25 1968-11-25 Fuel burner power failure bridge Expired - Lifetime US3544247A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77873768A 1968-11-25 1968-11-25

Publications (1)

Publication Number Publication Date
US3544247A true US3544247A (en) 1970-12-01

Family

ID=25114270

Family Applications (1)

Application Number Title Priority Date Filing Date
US778737A Expired - Lifetime US3544247A (en) 1968-11-25 1968-11-25 Fuel burner power failure bridge

Country Status (3)

Country Link
US (1) US3544247A (enrdf_load_stackoverflow)
DE (1) DE1958741A1 (enrdf_load_stackoverflow)
GB (1) GB1297523A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4254759A (en) * 1978-01-18 1981-03-10 Schmidt Robert H Automatic damper means and controls therefor
USRE31256E (en) * 1978-01-18 1983-05-31 Automatic damper means and controls therefor
EP0454613A1 (en) * 1990-04-27 1991-10-30 Francisco Bertomeu Martinez Gas appliance
US20080241772A1 (en) * 2005-08-16 2008-10-02 Stefano Zanella Device for the Multifunctional Control of the Supply of a Combustible Gas to a Burner Apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429131A (en) * 1943-09-04 1947-10-14 Standard Oil Dev Co Time delay feature for flame failure protective device
US2519789A (en) * 1946-06-19 1950-08-22 Rca Corp Electronic gas control circuit
US2793291A (en) * 1950-07-08 1957-05-21 Gen Controls Co Control apparatus using oscillatory circuits
US3291193A (en) * 1963-12-31 1966-12-13 Adams & Westlake Co Venetian blind window

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429131A (en) * 1943-09-04 1947-10-14 Standard Oil Dev Co Time delay feature for flame failure protective device
US2519789A (en) * 1946-06-19 1950-08-22 Rca Corp Electronic gas control circuit
US2793291A (en) * 1950-07-08 1957-05-21 Gen Controls Co Control apparatus using oscillatory circuits
US3291193A (en) * 1963-12-31 1966-12-13 Adams & Westlake Co Venetian blind window

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4254759A (en) * 1978-01-18 1981-03-10 Schmidt Robert H Automatic damper means and controls therefor
USRE31256E (en) * 1978-01-18 1983-05-31 Automatic damper means and controls therefor
EP0454613A1 (en) * 1990-04-27 1991-10-30 Francisco Bertomeu Martinez Gas appliance
US20080241772A1 (en) * 2005-08-16 2008-10-02 Stefano Zanella Device for the Multifunctional Control of the Supply of a Combustible Gas to a Burner Apparatus

Also Published As

Publication number Publication date
DE1958741A1 (de) 1970-06-18
GB1297523A (enrdf_load_stackoverflow) 1972-11-22

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