EP4027058A1 - Verfahren und anordnung zur erkennung von flüssigkeit in einem gebläse eines heizgerätes - Google Patents

Verfahren und anordnung zur erkennung von flüssigkeit in einem gebläse eines heizgerätes Download PDF

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Publication number
EP4027058A1
EP4027058A1 EP21213010.8A EP21213010A EP4027058A1 EP 4027058 A1 EP4027058 A1 EP 4027058A1 EP 21213010 A EP21213010 A EP 21213010A EP 4027058 A1 EP4027058 A1 EP 4027058A1
Authority
EP
European Patent Office
Prior art keywords
fan
blower
liquid
heater
speed
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.)
Pending
Application number
EP21213010.8A
Other languages
German (de)
English (en)
French (fr)
Inventor
Maik Telgmann
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.)
Vaillant GmbH
Original Assignee
Vaillant GmbH
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 Vaillant GmbH filed Critical Vaillant GmbH
Publication of EP4027058A1 publication Critical patent/EP4027058A1/de
Pending 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
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L5/00—Blast-producing apparatus before the fire
    • F23L5/02—Arrangements of fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/06—Sampling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/20—Warning devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/20—Warning devices
    • F23N2231/22—Warning devices using warning lamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/26—Fail safe for clogging air inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2239/00—Fuels
    • F23N2239/04—Gaseous fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/06—Space-heating and heating water

Definitions

  • the invention relates to a method and an arrangement for detecting the presence of liquid in a fan of a heater that is operated with a mixture of air and a fuel gas.
  • Modern heaters are operated using premix burners, in which air is first mixed with an amount of fuel gas suitable for clean combustion and the resulting mixture is then fed to a burner by a blower.
  • the burner distributes the mixture into a combustion chamber where it is burned to form flames.
  • Any exhaust gases are discharged through an exhaust system.
  • Combustion gases containing hydrogen or hydrocarbons also produce water vapor during combustion, which can form condensate at various points in the heater together with possible other components.
  • a non-return valve which is generally located in the exhaust system, prevents water vapor or condensate from entering the fan. This applies in particular to multi-occupancy systems where several heaters are connected to one chimney.
  • a control and regulation unit typically initiates all associated processes, including starting and increasing the speed of the fan up to a predefinable setpoint.
  • the blower is supplied with one- to three-phase alternating current, the effective strength of which is specified by pulse width modulation (so-called PWM signal).
  • PWM signal pulse width modulation
  • the object of the present invention is to at least alleviate the problems explained with reference to the prior art, and in particular to detect the presence of liquid in the fan without additional instrumentation by means of the data and measured values that are available anyway can be used for this, e.g. B. to trigger a warning or error message or to initiate maintenance.
  • a method for detecting the presence of liquid in a fan of a heater contributes to this, the heater being operated with a mixture of air and fuel gas which is supplied to a burner by the fan.
  • at least one physical variable that is characteristic of the function of the fan is measured at least once at the end of a specifiable time interval from the start of the heater and compared with (previously known, determined and/or stored) empirical values and/or calibration data, with a deviation from the empirical values and /or calibration data is evaluated by a predetermined size (or predetermined amount) as an indication of liquid in the fan.
  • the (previously known, determined and/or stored) empirical values and/or calibration data include, in particular, values and/or curves of the characteristic physical variable under consideration, with (practically) no liquid and a (significant) amount of liquid being present in the blower, with possibly also a or there may be several limit values for certain amounts of liquid.
  • the empirical values and/or calibration data can also be available as a map, e.g. B. depending on the operating status of the heater, the ambient conditions, the position of the fan, etc. Until now, it was not assumed that (small) amounts of liquid in the fan, i.e.
  • a "physical variable” is understood here to mean any measurable property or variable or any operating parameter (derived from it) or any state variable (derived from it) that can say something about the state and/or the behavior of the blower, i.e. in particular variables such as speed, effective power consumption, mass flow, pressure difference, flow rate, temperature, noise level and the like.
  • "Experience values” can be preset and/or stored in particular for the heater, e.g. as the result of long-term tests or long-term observations of the operation of such heaters.
  • “Calibration data” can be set or determined, for example, when the heater is (first) set up; they may relate to levels that allow proper or efficient operation under site conditions.
  • the “predeterminable size” of the deviation can include a fixedly predetermined value or a value that may be variably adapted to the operating conditions. It is possible that the detection of a deviation by at least the predefinable size (immediately) leads to a warning and/or safety action in the heating device or its control and regulation unit.
  • the physical variable is measured only once at a significant point in time after the start, e.g. B. 0.1 to 2 s [seconds] afterwards, preferably 0.3 to 1.5 s, (determined and) compared, for greater accuracy also more (measurements and) comparisons can be carried out at intervals from one another. If the deviation from calibration data or empirical values, e.g. B. at> 10% (example of a predetermined size), this can be interpreted systemically as an indication of liquid.
  • the time profile of at least one physical variable that is characteristic of the function of the fan is measured and observed from the time the heater is started and compared with empirical values and/or calibration data, with deviations in the profile from the empirical values and/or calibration data are evaluated by a specifiable size as an indication of liquid in the blower.
  • a continuous or quasi-continuous observation of the course over time increases the accuracy and helps to avoid misinterpretations.
  • the speed of the blower is particularly suitable as a physical quantity to be observed. This is measured in all modern heaters anyway, and the measured value is constantly available to the control and regulation unit, so that it can be used not only for known controls but also to determine the presence of liquid in the fan without additional instrumentation.
  • pulse width modulation means switching on and off quickly (e.g. with a frequency of 1 kHz [kilohertz] or more) in a changeable rhythm, with the ratio between switch-on times (pulse widths) and switch-off times changing (modulating) becomes. This ratio is also called duty cycle and can also be specified as a percentage.
  • a 100% duty cycle means the power is on all the time, a 50% duty cycle means the power is on only half the time.
  • a warning or error message is preferably triggered when there is an indication of liquid in the blower.
  • This can be signaled acoustically via a signaling device or optically via a display or an indicator device (e.g. warning light) or sent to an external location in order to trigger maintenance.
  • a signaling device or optically via a display or an indicator device (e.g. warning light) or sent to an external location in order to trigger maintenance.
  • a display or an indicator device e.g. warning light
  • an arrangement for detecting the presence of liquid in a fan of a heater wherein the heater is operated with a mixture of air and fuel gas, which is supplied to a burner by the fan.
  • a control and regulation unit that is set up to control the start-up of the blower and its speed up to a target value by means of a pulse width modulated current and to process a measured actual value of the speed, with (at least) one comparator in the tax and Control unit is present, which is set up to compare the speed and / or the pulse width of the pulse width modulated current with stored calibration data and / or empirical values and to trigger a warning or error message if there is a deviation by a predetermined size.
  • a control and regulation unit that is typical for such heaters already has data storage for calibration data and/or empirical values and at least one microprocessor, so that it can take on the additional functions described without great effort.
  • the speed of the fan and the PWM signal for controlling the fan are also constantly available there.
  • the comparator is preferably set up to carry out a comparison not just at one point in time after the start, but rather at a number of points in time and/or quasi-continuously after the start of the heater. In this way, greater accuracy of data interpretation can be achieved, so that erroneous warning or fault messages (false alarms) cannot easily occur.
  • a further aspect relates to a computer program product comprising instructions which cause the arrangement described to carry out the method described.
  • the comparison of measured data with empirical values or calibration data requires a program and data for the control and regulation unit of the heater, both of which have to be updated from time to time.
  • Such a computer program product can contribute to this.
  • the explanations for the method can be used for a more detailed characterization of the arrangement, and vice versa.
  • the arrangement can also be set up in such a way that the method is carried out with it.
  • FIG. 1 1 schematically shows a typical heater 1 (e.g. a so-called condensing boiler) which can be operated with a mixture of air and fuel gas.
  • a fan 4 draws in ambient air, which is mixed with a fuel gas quantity suitable for clean combustion via a fuel gas valve 6 .
  • the mixture is supplied to a burner 2 by the blower 4 via a mixture channel 7 and burned in a combustion chamber 3 .
  • Exhaust gases are discharged via an exhaust pipe 10 with a non-return valve 11 .
  • a central control and regulation unit 5 controls and regulates the heater.
  • This also includes activating the fan 4 via a signal line 8 with a pulse width modulated current (PWM signal) when starting the heater 1 and monitoring the speed D of the fan when starting and running up via a measuring line 9 in order to quickly reduce the speed D to a to bring predetermined setpoint and regulate there.
  • PWM signal pulse width modulated current
  • the control and regulation unit 5 has a comparator 12 and at least one data memory 13 for calibration data and/or empirical values. After starting the heater 1 so the Compare the course of the speed D and/or the PWM signal as a function of the time after the start with stored or specified courses (calibration data).
  • liquid 15 in the blower leads to very typical deviations (d1, d2, d3) which, above a predetermined size, e.g. B. more than 5%, preferably more than 10%, at any time of stored values can be interpreted as an indication of the presence of liquid 15. It can be sufficient to determine the deviation at just one suitable point in time, but more reliable results are obtained when comparing at two or more points in time, in particular when comparing values measured continuously or at short time intervals (quasi-continuously). If there are indications of the presence of liquid 15 in the blower, a signaling device 14 is then activated and/or a warning or error message is otherwise triggered, in particular also sent to a remote location in order, for example, to B. to trigger maintenance.
  • a predetermined size e.g. B. more than 5%, preferably more than 10%
  • FIG. 2 shows an example of the course of speed D and PWM signal within the first 2 s after starting heater 1.
  • the time t is plotted on the x-axis, the speed D (revolutions per second) on the left and the right on the right Size of the PWM signal in percent.
  • the solid line corresponds to the progression of the PWM signal without liquid 15 in fan 4.
  • a continuous current (duty cycle of 100%) is first sent for 0.5 s .
  • the PWM signal can then be lowered because the speed D has quickly approached its target value (constant speed in the diagram). This can be recognized by a drop in the previously constant PWM signal.
  • liquid 15 in fan 4 can be determined very reliably by comparator 12 according to the invention.
  • the present invention allows the presence of liquid in the blower to be detected early and reliably in a heater without additional instrumentation, thereby preventing subsequent damage.

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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)
EP21213010.8A 2021-01-07 2021-12-08 Verfahren und anordnung zur erkennung von flüssigkeit in einem gebläse eines heizgerätes Pending EP4027058A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021100119.6A DE102021100119A1 (de) 2021-01-07 2021-01-07 Verfahren und Anordnung zur Erkennung von Flüssigkeit in einem Gebläse eines Heizgerätes

Publications (1)

Publication Number Publication Date
EP4027058A1 true EP4027058A1 (de) 2022-07-13

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EP21213010.8A Pending EP4027058A1 (de) 2021-01-07 2021-12-08 Verfahren und anordnung zur erkennung von flüssigkeit in einem gebläse eines heizgerätes

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Country Link
EP (1) EP4027058A1 (zh)
CN (1) CN114719289A (zh)
DE (1) DE102021100119A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4345377A1 (de) * 2022-09-27 2024-04-03 Vaillant GmbH Vorrichtung für ein heizgerät, heizgerät und verfahren zu dessen betrieb

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02146412A (ja) * 1988-11-28 1990-06-05 Matsushita Electric Ind Co Ltd 送風機の制御装置
JPH09145054A (ja) * 1995-11-24 1997-06-06 Paloma Ind Ltd 燃焼機器
US10451303B1 (en) * 2018-07-30 2019-10-22 Rheem Manufacturing Company Electronic detection of vent blockage and blower malfunction in temperature control systems

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19901708B4 (de) 1999-01-18 2009-01-15 J. Eberspächer GmbH & Co. KG Drehzahlgeregelter Elektromotor ohne Motorstrombegrenzung, insbesondere drehzahlgeregelter Brennermotor eines Kraftfahrzeug-Heizgerätes
JP2004169981A (ja) 2002-11-19 2004-06-17 Matsushita Electric Ind Co Ltd 燃焼装置
DE102008006120B4 (de) 2008-01-25 2016-08-18 Eberspächer Climate Control Systems GmbH & Co. KG Verfahren zur Erkennung einer Strömungsverdämmung im Verbrennungsluftströmungsweg oder/und im Abgasströmungsweg eines brennstoffbetriebenen Heizgerätes, insbesondere für ein Fahrzeug

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02146412A (ja) * 1988-11-28 1990-06-05 Matsushita Electric Ind Co Ltd 送風機の制御装置
JPH09145054A (ja) * 1995-11-24 1997-06-06 Paloma Ind Ltd 燃焼機器
US10451303B1 (en) * 2018-07-30 2019-10-22 Rheem Manufacturing Company Electronic detection of vent blockage and blower malfunction in temperature control systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4345377A1 (de) * 2022-09-27 2024-04-03 Vaillant GmbH Vorrichtung für ein heizgerät, heizgerät und verfahren zu dessen betrieb

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CN114719289A (zh) 2022-07-08
DE102021100119A1 (de) 2022-07-07

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