EP0784190A1 - Dispositif d'optimaliser du rendement d'un chaudière à gaz - Google Patents

Dispositif d'optimaliser du rendement d'un chaudière à gaz Download PDF

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Publication number
EP0784190A1
EP0784190A1 EP96110211A EP96110211A EP0784190A1 EP 0784190 A1 EP0784190 A1 EP 0784190A1 EP 96110211 A EP96110211 A EP 96110211A EP 96110211 A EP96110211 A EP 96110211A EP 0784190 A1 EP0784190 A1 EP 0784190A1
Authority
EP
European Patent Office
Prior art keywords
fan
heat generator
control
burner
signal
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.)
Granted
Application number
EP96110211A
Other languages
German (de)
English (en)
Other versions
EP0784190B1 (fr
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
OCEAN IDROCLIMA 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 OCEAN IDROCLIMA SpA filed Critical OCEAN IDROCLIMA SpA
Publication of EP0784190A1 publication Critical patent/EP0784190A1/fr
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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
    • 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 the main claim.
  • 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.
  • 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 achieve "scavenging" of 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 Dispositif d'optimaliser du rendement d'un chaudière à gaz Expired - Lifetime EP0784190B1 (fr)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=11372893

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96110211A Expired - Lifetime EP0784190B1 (fr) 1996-01-12 1996-06-25 Dispositif d'optimaliser du rendement d'un chaudière à gaz

Country Status (4)

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

Citations (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
JPS62169929A (ja) * 1986-01-20 1987-07-27 Sanyo Electric Co Ltd 燃焼制御装置
GB2191022A (en) * 1986-05-27 1987-12-02 Rinnai Kk A fluid heating apparatus
EP0413942A2 (fr) * 1989-08-25 1991-02-27 Webasto AG Fahrzeugtechnik Dispositif de chauffage
JPH03117812A (ja) * 1989-09-29 1991-05-20 Harman Co Ltd 燃焼装置用の給気装置

Patent Citations (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
JPS62169929A (ja) * 1986-01-20 1987-07-27 Sanyo Electric Co Ltd 燃焼制御装置
GB2191022A (en) * 1986-05-27 1987-12-02 Rinnai Kk A fluid heating apparatus
EP0413942A2 (fr) * 1989-08-25 1991-02-27 Webasto AG Fahrzeugtechnik Dispositif de chauffage
JPH03117812A (ja) * 1989-09-29 1991-05-20 Harman Co Ltd 燃焼装置用の給気装置

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 006 (M - 445) 11 January 1986 (1986-01-11) *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 034 (M - 558) 31 January 1987 (1987-01-31) *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 004 (M - 657) 8 January 1988 (1988-01-08) *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 314 (M - 1145) 12 August 1991 (1991-08-12) *

Also Published As

Publication number Publication date
EP0784190B1 (fr) 2000-03-15
ATE190711T1 (de) 2000-04-15
IT1281658B1 (it) 1998-02-26
DE69607129D1 (de) 2000-04-20
DE69607129T2 (de) 2000-07-13
ITMI960044A0 (fr) 1996-01-12
ITMI960044A1 (it) 1997-07-12

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