EP0784190B1 - Device for optimizing the efficiency of a gas-fired heat generator - Google Patents

Device for optimizing the efficiency of a gas-fired heat generator Download PDF

Info

Publication number
EP0784190B1
EP0784190B1 EP96110211A EP96110211A EP0784190B1 EP 0784190 B1 EP0784190 B1 EP 0784190B1 EP 96110211 A EP96110211 A EP 96110211A EP 96110211 A EP96110211 A EP 96110211A EP 0784190 B1 EP0784190 B1 EP 0784190B1
Authority
EP
European Patent Office
Prior art keywords
signal
gas
fan
mains
burner
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
EP96110211A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0784190A1 (en
Inventor
Lamberto Del Grosso
Giancarlo Vendramini
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.)
BAXI S.P.A.
Original Assignee
Baxi SpA
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 Baxi SpA filed Critical Baxi SpA
Publication of EP0784190A1 publication Critical patent/EP0784190A1/en
Application granted granted Critical
Publication of EP0784190B1 publication Critical patent/EP0784190B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/08—Regulating air supply or draught by power-assisted systems
    • F23N3/082—Regulating air supply or draught by power-assisted systems using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/06—Regulating fuel supply conjointly with draught
    • F23N1/062—Regulating fuel supply conjointly with draught 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
    • F23N2227/04—Prepurge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/02—Ventilators in stacks
    • F23N2233/04—Ventilators in stacks with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves

Definitions

  • This invention relates to a device in accordance with the introduction to claim 1.
  • a modern gas-fired heat generator or boiler is known to comprise a fan used both as the device for evacuating burnt gases from the combustion chamber and as the combustion air feed member.
  • the heat output of the adjustable heat generator is regulated by the action of its control unit on the pressure regulator of the gas valve, but the rotational speed of the fan is left unaltered to give a constant volumetric throughput (optimized for maximum heat output).
  • combustion takes place with optimum combustion air throughput only for maximum heat output, the air throughput being excessive and increasing as the heat output decreases.
  • the thermal efficiency with respect to the water decreases in relation to the air excess.
  • JP-A-62169929 relates to a device according to the preamble of the main claim.
  • a control of the rotational speed of an intake and exhaust fan corresponding to the opening of a proportional control valve which represents the amount of combustion of a burner In order to obtain said control, there are provided rotational speed setting means which sets in a plurality of stages the fan speed corresponding to the openineg of the control valve, and drive data output means which outputs to a rotation drive means data for driving the intake and exhaust fan.
  • the data of the drive data output means are renewed by the result of a comparison of the output of a rotational speed detection circuit, obtained by detection means, with the output of the rotational speed setting means; as a consequence of this comparison, when the fan speed drops, it is corrected, and when said speed rises, it is not corrected, and an amount of blast close to a set amount can be secured.
  • An object of the present invention is therefore to provide an improved device for optimizing the efficiency of a gas-fired boiler.
  • a particular object of the invention is to provide a device of the stated type allowing the combustion air throughput to be substantially and instantaneously regulated for all operating ranges (ie for every possible required heat output) of the heat generator.
  • a further object is to provide a device of the stated type which, even if the mains voltage varies (rises or falls), enables optimum combustion air throughput to be maintained for any gas flow to the burner, in particular enabling a minimum air throughput corresponding to minimum heat output to be maintained even following a drop in mains voltage.
  • FIG. 1 shows the device 1 of the invention, comprising means 2 for controlling a motor 3 of a usual fan (not shown) positioned within the combustion chamber of a gas-fired heat generator (not shown).
  • the means 2 measure the voltage across a usual electrically operated flow regulator (not shown), and on the basis of this (ie on the basis of the gas flow rate to the burner) they act on the fan motor 3 to modify the fan speed and hence modify the combustion air flow rate.
  • a voltage V REF is withdrawn from across the modulator of a gas valve (not shown) defining the said gas flow regulator.
  • This voltage is fed to an amplifier 5 which amplifies the V REF signal and constitutes a stage with a high impedance input. From the amplifier there leaves a signal V C which is fed to a comparator 6 which compares this signal with a voltage signal V R originating from a block 7 which measures the voltage of the electricity mains powering the heat generator.
  • the block 7 in particular comprises a ramp generator 8 connected to a zero sensor 9 from which it receives a signal V Z . This latter is formed from a sequence of pulses generated each time the mains voltage passes through zero.
  • the block 7 is connected to the mains voltage V A (symbolize by the block 10) via a voltage reducer 12.
  • the ramp generator 8 is connected to a timer member 15 which receives mains voltage downstream of the voltage reducer and is connected in parallel with the zero sensor 9.
  • the purpose of the member 15 is to enable the fan motor 3 to be powered to achieve maximum rotational speed (and hence maximum combustion air flow) for a predetermined time period each time the heat generator is started, independently of the value of V REF , so as to prepurge the combustion chamber.
  • the comparator 6 compares the signals V C and V R , and generates an output signal V U which is fed to an adder node 17 which also receives a signal V K from a filter member 18 of compensator-limiter type which receives the mains voltage downstream of the reducer 12.
  • the member 18 compensates for mains voltage variations which would otherwise influence the feed voltage of the motor 3. In particular, the member 18 ensures that the motor feed voltage never falls below a predetermined minimum value so as to set a minimum rotational speed of the motor 3 at which the air flow rate corresponds to the minimum heat output of the boiler.
  • a signal V X leaves the adder node 17 to reach the control means 2.
  • These latter can be an actual microprocessor unit (so as for example to allow automatic memorized control of the motor 3 on the basis of each value of V REF measured or of the signal V X ) or a simple comparator member or other known control means.
  • the unit 2 is connected to a galvanic separator 20 which ensures adequate electrical isolation between the mains voltage and the very low safety voltage present in the circuit.
  • the signal from the unit 2 hence controls the closure and opening of a static switch (for example a TRIAC) 22 through which the mains power reaches the motor 3.
  • a static switch for example a TRIAC
  • the control means or unit 2 measure the voltage V REF corresponding to the state of gas flow to the burner, and hence by means of this signal measure the gas flow rate to said burner.
  • This signal is compared with the signal V R representative of the instantaneous mains voltage powering the motor 3. If this comparison shows that there is a preset difference between these two signals, the signal V U is generated and, suitably treated with the signal V K , reaches the means 2.
  • the means 2 operate to modify the duty cycle of the static switch, to hence vary the speed of the motor 3 and of the fan.
  • the device of the invention is reliable, is simple to construct and can be mounted in boilers already provided with an electrically controlled gas flow regulator, even after their installation.

Landscapes

  • 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)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Led Devices (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Sorption Type Refrigeration Machines (AREA)
EP96110211A 1996-01-12 1996-06-25 Device for optimizing the efficiency of a gas-fired heat generator Expired - Lifetime EP0784190B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI960044 1996-01-12
IT96MI000044A IT1281658B1 (it) 1996-01-12 1996-01-12 Dispositivo ottimizzatore del rendimento di un generatore di calore a combustibile gassoso

Publications (2)

Publication Number Publication Date
EP0784190A1 EP0784190A1 (en) 1997-07-16
EP0784190B1 true EP0784190B1 (en) 2000-03-15

Family

ID=11372893

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96110211A Expired - Lifetime EP0784190B1 (en) 1996-01-12 1996-06-25 Device for optimizing the efficiency of a gas-fired heat generator

Country Status (4)

Country Link
EP (1) EP0784190B1 (enrdf_load_stackoverflow)
AT (1) ATE190711T1 (enrdf_load_stackoverflow)
DE (1) DE69607129T2 (enrdf_load_stackoverflow)
IT (1) IT1281658B1 (enrdf_load_stackoverflow)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60169014A (ja) * 1984-02-14 1985-09-02 Rinnai Corp 燃焼安全装置
JPS61202011A (ja) * 1985-03-01 1986-09-06 Sanyo Electric Co Ltd 強制給排気式燃焼器
JPH0637975B2 (ja) * 1986-01-20 1994-05-18 三洋電機株式会社 燃焼制御装置
JPS62280516A (ja) * 1986-05-27 1987-12-05 Rinnai Corp 燃焼装置
DE3928114C2 (de) * 1989-08-25 1994-02-10 Webasto Ag Fahrzeugtechnik Verfahren zur Steuerung eines über einen Motor angetriebenen Brennluftgebläses für ein Heizgerät
JP2594363B2 (ja) * 1989-09-29 1997-03-26 株式会社ハーマン 燃焼装置用の給気装置

Also Published As

Publication number Publication date
ITMI960044A1 (it) 1997-07-12
ITMI960044A0 (enrdf_load_stackoverflow) 1996-01-12
IT1281658B1 (it) 1998-02-26
EP0784190A1 (en) 1997-07-16
DE69607129D1 (de) 2000-04-20
ATE190711T1 (de) 2000-04-15
DE69607129T2 (de) 2000-07-13

Similar Documents

Publication Publication Date Title
US5682826A (en) Systems and methods for controlling a draft inducer for a furnace
EP0322132B1 (en) Fuel burner apparatus and a method of control
US7241135B2 (en) Feedback control for modulating gas burner
CA2571522C (en) Method for setting the air ratio on a firing device and a firing device
CA2582197C (en) System and method for combustion-air modulation of a gas-fired heating system
US4852797A (en) Process for operating a fuel-operated heater and control arrangement for performing the process
US4238185A (en) Control system for a burner
US5676069A (en) Systems and methods for controlling a draft inducer for a furnace
JPS62252826A (ja) 燃焼装置
EP0784190B1 (en) Device for optimizing the efficiency of a gas-fired heat generator
JPS6064122A (ja) 燃焼制御装置
GB2187309A (en) Burner control
JPS62280516A (ja) 燃焼装置
KR0122496B1 (ko) 연소장치
KR0167837B1 (ko) 연소기기의 연소제어회로
JPS634096B2 (enrdf_load_stackoverflow)
KR940002072B1 (ko) 버너 연소 제어시스템
KR920007072B1 (ko) 전동기 제어장치
KR100541745B1 (ko) 버너 시스템
SU1276880A1 (ru) Система автоматического регулировани процесса горени
SU1612181A1 (ru) Система регулировани подачи воздуха на горение дл водогрейного котла
KR930007833Y1 (ko) 전동기의 제어장치
SU850993A1 (ru) Система автоматического регулировани пОдАчи ТОплиВА B пАРОгЕНЕРАТОР
KR940004177B1 (ko) 가열 제어장치
SU1575003A1 (ru) Система автоматического регулировани подачи топлива в топку котла

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT DE FR GB

17P Request for examination filed

Effective date: 19970912

17Q First examination report despatched

Effective date: 19981124

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: BAXI S.P.A.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FR GB

REF Corresponds to:

Ref document number: 190711

Country of ref document: AT

Date of ref document: 20000415

Kind code of ref document: T

REF Corresponds to:

Ref document number: 69607129

Country of ref document: DE

Date of ref document: 20000420

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20080623

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20080703

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20080630

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20080623

Year of fee payment: 13

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20090625

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20100226

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090625

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100101

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090625