EP0681147A1 - Gas-fitted instantaneous water heater - Google Patents

Gas-fitted instantaneous water heater Download PDF

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Publication number
EP0681147A1
EP0681147A1 EP95105165A EP95105165A EP0681147A1 EP 0681147 A1 EP0681147 A1 EP 0681147A1 EP 95105165 A EP95105165 A EP 95105165A EP 95105165 A EP95105165 A EP 95105165A EP 0681147 A1 EP0681147 A1 EP 0681147A1
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EP
European Patent Office
Prior art keywords
ignition
valve
water
water heater
gas
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.)
Withdrawn
Application number
EP95105165A
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German (de)
French (fr)
Inventor
Jürgen Dipl.-Ing. Hahne (FH)
Erwin Dipl.-Ing. Witzki (Fh)
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Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP0681147A1 publication Critical patent/EP0681147A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F23N1/087—Regulating fuel supply conjointly with another medium, e.g. boiler water using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/36—Spark ignition, e.g. by means of a high voltage

Definitions

  • the invention relates to a gas-heated once-through water heater according to the preamble of the main claim.
  • Known water heaters of this type obtain the ignition energy from the device's own battery or from the network.
  • gas-heated water heaters which have a thermoelectric safety device for igniting and monitoring the gas burner, in which a pilot burner is ignited by a spark gap which is connected to a piezzoelectric voltage source. The pilot burner heats a thermocouple, which feeds a magnetic safety valve in the gas supply line via a thermal circuit.
  • the arrangement according to the invention with the characterizing features of the main claim works independently of the network, so that security measures that have to be taken when connecting a water heater to a 220V network can largely be dispensed with.
  • the ignition device according to the invention is largely maintenance-free; the environment is also protected because there are no discharged batteries.
  • the ignition circuit be monitored by a timer 61 to limit the time of the ignition process.
  • thermoelectric ignition safety device for safety monitoring of the gas burner, the pilot burner of which is flammable by the ignition device according to the invention and whose magnet armature in the safety valve (magnet insert) can be converted into the retracted position by an actuating force derived from the beginning water flow. This ensures that additional measures for igniting and monitoring the gas burner are omitted while maintaining the independence from the network.
  • the magnet armature of the safety valve can advantageously be moved into a starting position which enables the safety valve to be closed by means of a restoring force which is effective after the water flow has ended be traceable. It is thereby achieved that the pilot flame burns only during the water tap.
  • thermoelectric ignition fuse To quickly activate the thermoelectric ignition fuse, it is also proposed that an additional voltage generated by the ignition generator is applied to the solenoid of the safety valve parallel to the thermal voltage at the start of the tap.
  • an ignition generator driven by the water flow also makes it possible, with an appropriate design, to design it as an energy source for a solenoid valve, for example a safety valve that monitors proper ignition or a gas valve that serves as a low water protection device.
  • a solenoid valve for example a safety valve that monitors proper ignition or a gas valve that serves as a low water protection device.
  • the usual diaphragm system for low water protection can be dispensed with if the actuating forces for a gas valve are derived from the electromagnetic axial forces between the armature and stator of the ignition generator and / or the hydraulic axial forces of the impeller of a turbine provided for driving the ignition generator.
  • FIG. 1 shows an overall picture of a water heater according to the first exemplary embodiment
  • FIG. 2 shows an enlarged valve arrangement of the water heater according to FIG. 1
  • FIG. 3 shows a partial picture of a water heater according to the second exemplary embodiment.
  • the water heater according to FIG. 1 has a gas feed line 10, which leads to an atmospheric gas burner 15 via a thermoelectric safety device 11, a gas valve 13 actuated by a hydraulic actuator 12, which forms a lack of water safety device, and a gas quantity regulator 14.
  • the device also has a cold water connection 18, which leads via a vane motor 19 into a chamber 20 of a water fitting 21 and into a high pressure chamber 22 of the hydraulic actuator 12 integrated into the water fitting 21.
  • the high-pressure chamber 22 is separated from a low-pressure chamber 23 by a membrane 24, which acts on the gas valve 13 via adjusting pins 25, 26 arranged coaxially one behind the other.
  • the low-pressure chamber 23 is connected to the narrowest point of a venturi 27, which lies in the course of a line extending from the high-pressure chamber 22, which leads via a heat exchanger 29 to a hot water tap valve 30. This is followed by an outlet 31 into which a connection from the chamber 20 monitored by a cold water tap valve 32 also opens.
  • the safety device 11 shown in more detail in FIG. 2 has a so-called magnet insert 34, the magnet armature 35 of which is connected to a spring-loaded valve closing member 26 in the axial direction without play.
  • a second valve seat which is monitored by a valve closing member 40 which is slidably seated on a bolt 41 which is articulated at 42 to a pivot lever 43.
  • the valve closing member 40 is supported by a spring 44 supported on the pivot lever 43 against a stop 45 on the bolt 41 pressed.
  • the bolt 41 has an end collar 46 which engages in a latching manner behind resiliently deflectable claws 47 which are fastened to the valve closing member 36.
  • the pivoting lever 43 which is pivotably mounted at 48 and acted upon by a spring 49 in the clockwise direction, carries at one end a leaf spring 50 which engages over the adjusting pin 26 in a fork-shaped manner.
  • a switching cam 52 is arranged on the actuating pin 26 and is located below the leaf spring 50 in the idle state of the device and above the leaf spring 50 in the operating position shown in the drawing.
  • the switching cam 52 protrudes over the edge of the fork slot in the leaf spring 50 and the leaf spring 50 is designed such that it moves the pivot lever 43 when the actuating pin 26 is moved from the rest position into the operating position and vice versa and thereby bends such that the switching cam 52 can go from one side to the other.
  • the swivel range of the swivel lever 43 is limited by the axial freedom of movement of the bolt 41, which comes to rest on the one hand on a housing stop 53 and on the other hand via the valve closing member 36 on the magnet insert 34.
  • the magnet insert 34 is fed by a thermocouple 55 which is heated by the pilot burner 39.
  • the ignition burner 39 is opposite an ignition electrode 56 in the spark gap distance, which is connected via an ignition line 57 to a stator winding 58 of an ignition generator 59, the rotor 60 of which is coupled to the vane motor 19.
  • the ignition line 57 is monitored by a switch 61, which is actuated by a switch cam 62 on the actuating pin 25. The arrangement is such that the switch 61 closes the ignition line 57 at the beginning of a dispensing operation over a predetermined stroke of the hydraulic actuator 12 and then interrupts it.
  • the ignition generator 59 has a second stator winding 63, which is parallel to the thermocouple 55 Magnet insert feeds via a line 64, which is also timed by the switch 61.
  • a bypass channel 66 which bypasses the venturi 27 is formed in the water fitting 21 and is monitored by an adjusting element 67 for the temperature selection.
  • a slow ignition device 71 is provided, which throttles the water inflow into the low pressure chamber 23.
  • the hot water tap valve 30 When the hot water tap valve 30 is open, the water flowing through the vane motor 19 drives the ignition generator 59.
  • the switching cam 62 keeps the switch 61 closed, so that a spark band is formed on the pilot burner 39 for a limited time.
  • the switching cam 52 on the actuating pin 26 acts on the swivel lever 43, which thereby displaces the bolt 41 downward, the valve closing member 40 getting onto its valve seat and that valve closing member 36 lifting off its valve seat until the magnet armature 35 comes to rest against the magnetic poles .
  • the gas can then flow via the lock chamber 37 to the ignition channel 39, where it ignites and heats the thermocouple 55.
  • the ignition generator 59 applies a voltage to the magnet insert 34 for a limited time via its second stator winding 63, so that its holding force is reached when the switching cam 52 overcomes the bending force of the leaf spring 50 and runs over it. Then the spring 49 pivots the pivot lever 43 back to the position shown in the drawing, in which the magnet armature 35 held in the retracted position determines the position of the bolt 41 and the two valve closing members 36, 40 lifted from their valve seats. Immediately thereafter, the actuating pin 26, which goes further upward, opens the gas valve 13 so that the gas can flow to the gas burner 15 secured by the pilot burner 39.
  • the closing spring 69 of the gas valve 13 returns the parts of the hydraulic actuator 12 to the starting position, the switch cam 52 temporarily pivoting the pivot lever 43 clockwise over the position shown in the drawing until the bolt 41 engages the housing stop 53 is coming.
  • the bolt 41 tears off the magnet armature 34 via the claws 47, after which the valve closing member 36 comes into its seat and the pilot light extinguishes.
  • the water heater according to the second exemplary embodiment, shown in part in FIG. 3, corresponds to the first exemplary embodiment with regard to the gas part including the thermoelectric safety device 11 and its mechanical coupling with an adjusting pin 26 influenced by the water flow.
  • a water turbine 81 is provided in a line 82 coming from the cold water connection, which leads downstream of the water turbine 81 directly to the heat exchanger of the device.
  • the water turbine 81 and the ignition generator 80 are arranged coaxially to the actuating pin 26 and are designed such that their hydraulic and electromagnetic axial forces occurring during operation move the actuating pin 26 upwards.
  • the safety device 11 is first activated and then the gas valve is opened.
  • a slow ignition device 83 is arranged between the ignition generator 80 and the actuating pin 26.
  • This has a buffer chamber 84 which is connected to the outside air via an adjustable throttle 85 and is delimited on one side by a membrane 86.
  • the membrane 86 is fixedly connected to an actuating linkage 87 which transmits the upward axial movements of the rotor shaft of the turbine generator unit 81, 80 to the actuating pin 26.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)

Abstract

The water heater has an ignition having an ignition generator (59) connected to a hydraulic turbo machine, especially vane cell motor (19), driven by the water flowing through. The ignition circuit is controlled by a time-switch (61). A thermoelectric safety pilot has an ignition burner (39) heating a thermoelement (55) and ignited by the ignition. A magnetic safety valve (34) is fed by the thermocurrent and has a magneto inductor (35) connected to the valve closure element (36) and moved by an adjusting force diverted from the water flow into a draw-in position in which the valve closure element is lifted from the valve seating. <IMAGE>

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem gasbeheizten Durchlauf-Wassererhitzer nach der Gattung des Hauptanspruchs. Bekannte Wassererhitzer dieser Gattung beziehen die Zündenergie aus einer geräteeigenen Batterie oder aus dem Netz. Ferner sind gasbeheizte Wassererhitzer bekannt, die zum Zünden und Überwachen des Gasbrenners eine thermoelektrische Sicherheitseinrichtung haben, bei welcher ein Zündbrenner durch eine Funkenstrecke gezündet wird, die an eine piezzoelektrische Spannungsquelle angeschlossen ist. Der Zündbrenner beheizt ein Thermoelement, das über einen Thermostromkreis ein magnetisches Sicherheitsventil in der Gaszuleitung speist.The invention relates to a gas-heated once-through water heater according to the preamble of the main claim. Known water heaters of this type obtain the ignition energy from the device's own battery or from the network. Furthermore, gas-heated water heaters are known which have a thermoelectric safety device for igniting and monitoring the gas burner, in which a pilot burner is ignited by a spark gap which is connected to a piezzoelectric voltage source. The pilot burner heats a thermocouple, which feeds a magnetic safety valve in the gas supply line via a thermal circuit.

Bei Wasserarmaturen für sanitäre Hausinstallationen ist es bekannt (EP 0 361 332 A1), einen elektrischen Generator vorzusehen, der von einem im Durchflußkanal der Armatur angeordneten Turbinenrad angetrieben ist und einen elektrischen Speicher auflädt, der Ventile, Temperaturmeßsonden und derartige Anzeigen mit Energie versorgt.In the case of water fittings for sanitary domestic installations, it is known (EP 0 361 332 A1) to provide an electrical generator which is driven by a turbine wheel arranged in the flow channel of the fitting and charges an electrical store which supplies energy to valves, temperature measuring probes and such displays.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs arbeitet netzunabhängig, so daß auf Sicherungsmaßnahmen, die beim das Anschließen eines Wassererhitzers an ein 220V-Netz getroffen werden müssen, weitgehend entfallen können. Im Gegensatz zu einer Batteriezündung ist die erfindungsgemäße Zündeinrichtung weitgehend wartungsfrei; außerdem wird die Umwelt geschont, weil keine entladenen Batterien anfallen.The arrangement according to the invention with the characterizing features of the main claim works independently of the network, so that security measures that have to be taken when connecting a water heater to a 220V network can largely be dispensed with. In contrast to battery ignition, the ignition device according to the invention is largely maintenance-free; the environment is also protected because there are no discharged batteries.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen der Anordnung nach dem Hauptanspruch möglich.Advantageous further developments of the arrangement according to the main claim are possible through the measures listed in the subclaims.

Um dauerndes Zünden während eines Zapfvorgangs zu vermeiden, wird vorgeschlagen, daß der Zündstromkreis von einem Zeitschaltglied 61 zur zeitlichen Begrenzung des Zündvorgangs überwacht ist.In order to avoid permanent ignition during a tap operation, it is proposed that the ignition circuit be monitored by a timer 61 to limit the time of the ignition process.

Zur Sicherheitsüberwachung des Gasbrenners kann eine thermoelektrische Zündsicherung an sich bekannter Bauart vorgesehen sein, deren Zündbrenner von der erfindungsgemäßen Zündeinrichtung entflammbar ist und deren Magnetanker im Sicherheitsventil (Magneteinsatz) von einer aus der beginnenden Wasserströmung abgeleiteten Stellkraft in die Einzugsstellung überführbar ist. Dadurch ist erreicht, daß unter Wahrung der Netzunabhängigkeit zusätzliche Maßnahmen zum Zünden und Überwachen des Gasbrenners entfallen.For safety monitoring of the gas burner, a thermoelectric ignition safety device of known type can be provided, the pilot burner of which is flammable by the ignition device according to the invention and whose magnet armature in the safety valve (magnet insert) can be converted into the retracted position by an actuating force derived from the beginning water flow. This ensures that additional measures for igniting and monitoring the gas burner are omitted while maintaining the independence from the network.

Zur Energieeinsparung kann vorteilhaft der Magnetanker des Sicherheitsventils durch eine nach Beendigung der Wasserströmung wirksame Rückstellkraft in eine das Schließen des Sicherheitsventils ermöglichende Ausgangsstellung zurückführbar sein. Dadurch ist erreicht, daß die Zündflamme nur während des Wasserzapfens brennt.In order to save energy, the magnet armature of the safety valve can advantageously be moved into a starting position which enables the safety valve to be closed by means of a restoring force which is effective after the water flow has ended be traceable. It is thereby achieved that the pilot flame burns only during the water tap.

Zum schnellen Aktivieren der thermoelektrischen Zündsicherung wird ferner vorgeschlagen, daß bei Zapfbeginn an die Magnetspule des Sicherheitsventils parallel zur Thermospannung eine vom Zündgenerator erzeugte Spannung zusätzlich angelegt ist.To quickly activate the thermoelectric ignition fuse, it is also proposed that an additional voltage generated by the ignition generator is applied to the solenoid of the safety valve parallel to the thermal voltage at the start of the tap.

Die erfindungsgemäße Anordnung eines von der Wasserströmung angetriebenen Zündgenerators ermöglicht es ferner, diesen bei entsprechender Auslegung auch als Energiequelle für ein Magnetventil auszubilden, zum Beispiel ein die ordnungsgemäße Zündung überwachendes Sicherheitsventil oder ein als Wassermangelsicherung dienendes Gasventil.The arrangement according to the invention of an ignition generator driven by the water flow also makes it possible, with an appropriate design, to design it as an energy source for a solenoid valve, for example a safety valve that monitors proper ignition or a gas valve that serves as a low water protection device.

Das übliche Membransystem einer Wassermangelsicherung kann entfallen, wenn die Stellkräfte für ein Gasventil aus den elektromagnetischen Axialkräften zwischen Anker und Stator des Zündgenerators und/oder den hydraulischen Axialkräften des Laufrades einer zum Antrieb des Zündgenerators vorgesehenen Turbine abgeleitet sind.The usual diaphragm system for low water protection can be dispensed with if the actuating forces for a gas valve are derived from the electromagnetic axial forces between the armature and stator of the ignition generator and / or the hydraulic axial forces of the impeller of a turbine provided for driving the ignition generator.

Zeichnungdrawing

Zwei Ausführungsbeispiele des Gegenstandes der Erfindung sind in der Zeichnung schematisch dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein Gesamtbild eines Wassererhitzers nach dem ersten Ausführungsbeispiel, Figur 2 vergrößert eine Ventilanordnung des Wassererhitzers nach Figur 1 und Figur 3 ein Teilbild eines Wassererhitzers nach dem zweiten Ausführungsbeispiel.Two embodiments of the object of the invention are shown schematically in the drawing and explained in more detail in the following description. FIG. 1 shows an overall picture of a water heater according to the first exemplary embodiment, FIG. 2 shows an enlarged valve arrangement of the water heater according to FIG. 1, and FIG. 3 shows a partial picture of a water heater according to the second exemplary embodiment.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Der Wassererhitzer nach Figur 1 hat eine Gaszuleitung 10, die über eine thermoelektrische Sicherheitseinrichtung 11, ein von einem hydraulischen Stellglied 12 betätigtes, mit diesem eine Wassermangelsicherung bildendes Gasventil 13 und einen Gasmengenregler 14 zu einem atmosphärischen Gasbrenner 15 führt. Das Gerät hat ferner einen Kaltwasseranschluß 18, der über einen Flügelzellenmotor 19 in eine Kammer 20 einer Wasserarmatur 21 und in eine Hochdruckkammer 22 des in die Wasserarmatur 21 integrierten hydraulischen Stellglieds 12 führt. Die Hochdruckkammer 22 ist von einer Niederdruckkammer 23 durch eine Membran 24 getrennt, die über koaxial hintereinanderliegende Stellstifte 25, 26 auf das Gasventil 13 einwirkt. Die Niederdruckkammer 23 ist an der engsten Stelle eines Venturis 27 angeschlossen, das im Zuge einer von der Hochdruckkammer 22 ausgehenden Leitung liegt, die über einen Wärmetauscher 29 zu einem Warmwasserzapfventil 30 führt. Diesem ist ein Auslauf 31 nachgeschaltet, in den auch eine von einem Kaltwasserzapfventil 32 überwachte Verbindung aus der Kammer 20 mündet.The water heater according to FIG. 1 has a gas feed line 10, which leads to an atmospheric gas burner 15 via a thermoelectric safety device 11, a gas valve 13 actuated by a hydraulic actuator 12, which forms a lack of water safety device, and a gas quantity regulator 14. The device also has a cold water connection 18, which leads via a vane motor 19 into a chamber 20 of a water fitting 21 and into a high pressure chamber 22 of the hydraulic actuator 12 integrated into the water fitting 21. The high-pressure chamber 22 is separated from a low-pressure chamber 23 by a membrane 24, which acts on the gas valve 13 via adjusting pins 25, 26 arranged coaxially one behind the other. The low-pressure chamber 23 is connected to the narrowest point of a venturi 27, which lies in the course of a line extending from the high-pressure chamber 22, which leads via a heat exchanger 29 to a hot water tap valve 30. This is followed by an outlet 31 into which a connection from the chamber 20 monitored by a cold water tap valve 32 also opens.

Die in Figur 2 näher dargestellte Sicherheitseinrichtung 11 hat einen sogenannten Magneteinsatz 34, dessen Magnetanker 35 mit einem federbelasteten Ventilschließglied 26 in Achsrichtung spiellos verbunden ist. Dieses überwacht einen Ventilsitz am Eingang einer Schleusenkammer 37, von der eine Zündgasleitung 38 zu einem Zündbrenner 39 am Gasbrenner 15 führt. Am Ausgang der Schleusenkammer 37 ist ein zweiter Ventilsitz vorgesehen, der von einem Ventilschließglied 40 überwacht ist, welches verschiebbar auf einem Bolzen 41 sitzt, der bei 42 an einen Schwenkhebel 43 angelenkt ist. Das Ventilschließglied 40 ist von einer sich am Schwenkhebel 43 abstützenden Feder 44 gegen einen Anschlag 45 am Bolzen 41 gedrückt. Der Bolzen 41 hat einen Stirnbund 46, welcher rastend hinter federnd auslenkbare Klauen 47 greift, die am Ventilschließglied 36 befestigt sind.The safety device 11 shown in more detail in FIG. 2 has a so-called magnet insert 34, the magnet armature 35 of which is connected to a spring-loaded valve closing member 26 in the axial direction without play. This monitors a valve seat at the entrance of a lock chamber 37, from which an ignition gas line 38 leads to an ignition burner 39 on the gas burner 15. At the exit of the lock chamber 37 there is a second valve seat which is monitored by a valve closing member 40 which is slidably seated on a bolt 41 which is articulated at 42 to a pivot lever 43. The valve closing member 40 is supported by a spring 44 supported on the pivot lever 43 against a stop 45 on the bolt 41 pressed. The bolt 41 has an end collar 46 which engages in a latching manner behind resiliently deflectable claws 47 which are fastened to the valve closing member 36.

Der bei 48 schwenkbar gelagerte und von einer Feder 49 im Uhrzeigersinn beaufschlagte Schwenkhebel 43 trägt an einem Ende eine Blattfeder 50, die den Stellstift 26 gabelförmig übergreift. Am Stellstift 26 ist ein Schaltnocken 52 angeordnet, der sich im Ruhezustand des Geräts unterhalb und in der in der Zeichnung dargestellten Betriebsstellung oberhalb der Blattfeder 50 befindet. Der Schaltnocken 52 ragt über den Rand des Gabelschlitztes in der Blattfeder 50 und die Blattfeder 50 ist so ausgebildet, daß sie beim Verschieben des Stellstiftes 26 aus der Ruhestellung in die Betriebsstellung und umgekehrt den Schwenkhebel 43 verstellt und sich dabei derart verbiegt, daß der Schaltnocken 52 von der einen auf die andere Seite gelangen kann. Der Schwenkbereich des Schwenkhebels 43 ist durch die axiale Bewegungsfreiheit des Bolzens 41 begrenzt, der einerseits an einem Gehäuseanschlag 53 und andererseits über das Ventilschließglied 36 am Magneteinsatz 34 zur Anlage kommt.The pivoting lever 43, which is pivotably mounted at 48 and acted upon by a spring 49 in the clockwise direction, carries at one end a leaf spring 50 which engages over the adjusting pin 26 in a fork-shaped manner. A switching cam 52 is arranged on the actuating pin 26 and is located below the leaf spring 50 in the idle state of the device and above the leaf spring 50 in the operating position shown in the drawing. The switching cam 52 protrudes over the edge of the fork slot in the leaf spring 50 and the leaf spring 50 is designed such that it moves the pivot lever 43 when the actuating pin 26 is moved from the rest position into the operating position and vice versa and thereby bends such that the switching cam 52 can go from one side to the other. The swivel range of the swivel lever 43 is limited by the axial freedom of movement of the bolt 41, which comes to rest on the one hand on a housing stop 53 and on the other hand via the valve closing member 36 on the magnet insert 34.

Der Magneteinsatz 34 ist von einem Thermoelement 55 gespeist, das von dem Zündbrenner 39 beheizt ist. Dem Zündbrenner 39 steht im Funkenstreckenabstand eine Zündelektrode 56 gegenüber, die über eine Zündleitung 57 an eine Statorwicklung 58 eines Zündgenerators 59 angeschlossen ist, dessen Rotor 60 mit dem Flügelzellenmotor 19 gekoppelt ist. Die Zündleitung 57 ist von einem Schalter 61 überwacht, der von einem Schaltnocken 62 am Stellstift 25 betätigt ist. Die Anordnung ist so getroffen, daß der Schalter 61 die Zündleitung 57 am Beginn eines Zapfvorgangs über einen vorgegebenen Hub des hydraulischen Stellglieds 12 schließt und danach unterbricht. Der Zündgenerator 59 hat eine zweite Statorwicklung 63, die parallel zum Thermoelement 55 den Magneteinsatz über eine Leitung 64 speist, die ebenfalls vom Schalter 61 zeitlich gesteuert ist.The magnet insert 34 is fed by a thermocouple 55 which is heated by the pilot burner 39. The ignition burner 39 is opposite an ignition electrode 56 in the spark gap distance, which is connected via an ignition line 57 to a stator winding 58 of an ignition generator 59, the rotor 60 of which is coupled to the vane motor 19. The ignition line 57 is monitored by a switch 61, which is actuated by a switch cam 62 on the actuating pin 25. The arrangement is such that the switch 61 closes the ignition line 57 at the beginning of a dispensing operation over a predetermined stroke of the hydraulic actuator 12 and then interrupts it. The ignition generator 59 has a second stator winding 63, which is parallel to the thermocouple 55 Magnet insert feeds via a line 64, which is also timed by the switch 61.

In der Wasserarmatur 21 ist ein das Venturi 27 umgehender Bypasskanal 66 gebildet, der von einem Einstellglied 67 für die Temperaturwahl überwacht ist. In Ruhestellung des Geräts ist zwischen dem Stellstift 26 und dem Schließkörper 70 des Gasventils 13 ein axialer Abstand vorhanden, so daß das Gasventil 13 erst nach einem bestimmten Vorhub des hydraulischen Stellglieds 12 öffnet. Am Eingang der Niederdruckkammer 23 ist eine Langsamzündvorrichtung 71 vorgesehen, die den Wasserzufluß in die Niederdruckkammer 23 drosselt.A bypass channel 66 which bypasses the venturi 27 is formed in the water fitting 21 and is monitored by an adjusting element 67 for the temperature selection. In the rest position of the device, there is an axial distance between the actuating pin 26 and the closing body 70 of the gas valve 13, so that the gas valve 13 only opens after a certain forward stroke of the hydraulic actuator 12. At the entrance of the low pressure chamber 23, a slow ignition device 71 is provided, which throttles the water inflow into the low pressure chamber 23.

Bei geöffnetem Warmwasserzapfventil 30 treibt das durchströmende Wasser über den Flügelzellenmotor 19 den Zündgenerator 59 an. Am Beginn eines Zapfvorgangs hält der Schaltnocken 62 den Schalter 61 geschlossen, so daß sich am Zündbrenner 39 ein Zündfunkenband zeitlich begrenzt ausbildet. Gleichzeitig wirkt der Schaltnocken 52 am Stellstift 26 auf den Schwenkhebel 43 ein, welcher dabei den Bolzen 41 nach unten verschiebt, wobei das Ventilschließglied 40 auf seinen Ventilsitz gelangt und daß Ventilschließglied 36 von seinem Ventilsitz abhebt, bis der Magnetanker 35 zur Anlage an den Magnetpolen kommt. Danach kann das Gas über die Schleusenkammer 37 zum Zündkanal 39 strömen, wo es sich entzündet und das Thermoelement 55 beheizt.When the hot water tap valve 30 is open, the water flowing through the vane motor 19 drives the ignition generator 59. At the beginning of a tap operation, the switching cam 62 keeps the switch 61 closed, so that a spark band is formed on the pilot burner 39 for a limited time. At the same time, the switching cam 52 on the actuating pin 26 acts on the swivel lever 43, which thereby displaces the bolt 41 downward, the valve closing member 40 getting onto its valve seat and that valve closing member 36 lifting off its valve seat until the magnet armature 35 comes to rest against the magnetic poles . The gas can then flow via the lock chamber 37 to the ignition channel 39, where it ignites and heats the thermocouple 55.

Zusätzlich zur Thermospannung des Thermoelements 55 legt der Zündgenerator 59 über seine zweite Statorwicklung 63 eine Spannung an den Magneteinsatz 34 zeitlich begrenzt an, so daß dessen Haltekraft erreicht ist, wenn der Schaltnocken 52 die Biegekraft der Blattfeder 50 überwindet und diese überfährt. Danach schwenkt die Feder 49 den Schwenkhebel 43 in die in der Zeichnung dargestellte Lage zurück, in welcher der in der Einzugsstellung festgehaltene Magnetanker 35 die Stellung des Bolzens 41 und der beiden von ihren Ventilsitzen abgehobenen Ventilschließglieder 36, 40 bestimmt. Unmittelbar danach öffnet der weiter nach oben gehende Stellstift 26 das Gasventil 13, so daß das Gas zu dem durch den Zündbrenner 39 gesicherten Gasbrenner 15 strömen kann. Nach Beendigung des Zapfens führt die Schließfeder 69 des Gasventils 13 die Teile des hydraulischen Stellglieds 12 in die Ausgangsstellung zurück, wobei der Schaltnocken 52 den Schwenkhebel 43 vorübergehend über die in der Zeichnung dargestellte Lage im Uhrzeigersinn verschwenkt, bis der Bolzen 41 zur Anlage am Gehäuseanschlag 53 kommt. Dabei reißt der Bolzen 41 über die Klauen 47 den Magnetanker 34 ab, wonach das Ventilschließglied 36 auf seinen Sitz gelangt und die Zündflamme erlischt.In addition to the thermal voltage of the thermocouple 55, the ignition generator 59 applies a voltage to the magnet insert 34 for a limited time via its second stator winding 63, so that its holding force is reached when the switching cam 52 overcomes the bending force of the leaf spring 50 and runs over it. Then the spring 49 pivots the pivot lever 43 back to the position shown in the drawing, in which the magnet armature 35 held in the retracted position determines the position of the bolt 41 and the two valve closing members 36, 40 lifted from their valve seats. Immediately thereafter, the actuating pin 26, which goes further upward, opens the gas valve 13 so that the gas can flow to the gas burner 15 secured by the pilot burner 39. After the end of the pin, the closing spring 69 of the gas valve 13 returns the parts of the hydraulic actuator 12 to the starting position, the switch cam 52 temporarily pivoting the pivot lever 43 clockwise over the position shown in the drawing until the bolt 41 engages the housing stop 53 is coming. The bolt 41 tears off the magnet armature 34 via the claws 47, after which the valve closing member 36 comes into its seat and the pilot light extinguishes.

Der zum Teil in Figur 3 dargestellte Wassererhitzer nach dem zweiten Ausführungsbeispiel stimmt bezüglich des Gasteils einschließlich der thermoelektrischen Sicherheitseinrichtung 11 und deren mechanische Koppelung mit einem von der Wasserströmung beeinflußten Stellstift 26 mit dem ersten Ausführungsbeispiel überein. Zum Antrieb eines Zündgenerators 80 ist eine Wasserturbine 81 in einer vom Kaltwasseranschluß kommenden Leitung 82 vorgesehen, die stromab der Wasserturbine 81 unmittelbar zum Wärmetauscher des Geräts führt. Die Wasserturbine 81 und der Zündgenerator 80 sind koaxial zum Stellstift 26 angeordnet und so ausgeführt, daß ihre im Betrieb auftretenden hydraulischen und elektromagnetischen Axialkräfte den Stellstift 26 nach oben verschieben. Dabei wird, wie beim ersten Ausführungsbeispiel, zunächst die Sicherheitseinrichtung 11 aktiviert und danach das Gasventil geöffnet.The water heater according to the second exemplary embodiment, shown in part in FIG. 3, corresponds to the first exemplary embodiment with regard to the gas part including the thermoelectric safety device 11 and its mechanical coupling with an adjusting pin 26 influenced by the water flow. To drive an ignition generator 80, a water turbine 81 is provided in a line 82 coming from the cold water connection, which leads downstream of the water turbine 81 directly to the heat exchanger of the device. The water turbine 81 and the ignition generator 80 are arranged coaxially to the actuating pin 26 and are designed such that their hydraulic and electromagnetic axial forces occurring during operation move the actuating pin 26 upwards. As in the first exemplary embodiment, the safety device 11 is first activated and then the gas valve is opened.

Zwischen dem Zündgenerator 80 und dem Stellstift 26 ist eine Langsamzündeinrichtung 83 angeordnet. Diese hat eine Pufferkammer 84, die über eine verstellbare Drossel 85 mit der Außenluft verbunden und an der einen Seite durch eine Membran 86 begrenzt ist. Die Membran 86 ist fest mit einem Stellgestänge 87 verbunden, welches die nach oben gerichteten Axialbewegungen der Rotorwelle des Turbine-Generatoraggregats 81, 80 auf den Stellstift 26 überträgt.A slow ignition device 83 is arranged between the ignition generator 80 and the actuating pin 26. This has a buffer chamber 84 which is connected to the outside air via an adjustable throttle 85 and is delimited on one side by a membrane 86. The membrane 86 is fixedly connected to an actuating linkage 87 which transmits the upward axial movements of the rotor shaft of the turbine generator unit 81, 80 to the actuating pin 26.

Claims (8)

Gasbeheizter Durchlauf-Wassererhitzer, mit einer am Beginn einer Strömung aktivierten Zündeinrichtung, die mit einer Zündenergiequelle und einer am Gasbrenner angeordneten Funkenstrecke versehen ist, dadurch gekennzeichnet, daß die Zündeinrichtung einen geräteeigenen Zündgenerator (59) hat, der mit einer vom durchlaufenden Wasser angetriebenen hydraulischen Strömungsmaschine, insbesondere einem Flügelzellenmotor (19), gekuppelt ist.Gas-fired instantaneous water heater, with an ignition device activated at the beginning of a flow, which is provided with an ignition energy source and a spark gap arranged on the gas burner, characterized in that the ignition device has its own ignition generator (59) which is operated with a hydraulic flow machine driven by the water flowing through , in particular a vane motor (19), is coupled. Wassererhitzer nach Anspruch 1, dadurch gekennzeichnet, daß der Zündstromkreis von einem Zeitschaltglied (61) zur zeitlichen Begrenzung des Zündvorgangs überwacht ist.Water heater according to claim 1, characterized in that the ignition circuit is monitored by a timer (61) to limit the time of the ignition process. Wassererhitzer nach Anspruch 1 oder 2, gekennzeichnet durch eine thermoelektrische Zündsicherung, die einen von der netzunabhängigen Zündeinrichtung entflammbaren, ein Thermoelement (55) beheizenden Zündbrenner (39) und ein vom Thermostrom gespeistes, magnetisches Sicherheitsventil (Magneteinsatz 34) hat, dessen mit dem Ventilschließglied (36) gekoppelter Magnetanker (35) durch eine aus der Wasserströmung abgeleitete Stellkraft in die Einzugsstellung bewegbar ist, in welcher das Ventilschließglied (36) vom Ventilsitz abgehoben ist.Water heater according to claim 1 or 2, characterized by a thermoelectric ignition fuse which has a pilot burner (39) which is flammable from the mains-independent ignition device and which heats a thermocouple (55) and a magnetic safety valve (magnet insert 34) fed by the thermoelectric current, the valve insert of which is connected to the valve closing member ( 36) coupled magnet armature (35) can be moved into the retracted position by an actuating force derived from the water flow, in which the valve closing member (36) is lifted off the valve seat. Wassererhitzer nach Anspruch 3, dadurch gekennzeichnet, daß die Stellkraft von einem von der Strömung des durchlaufenden Wassers beeinflußten Stellglied für ein Gasventil (Wassermangelsicherung) abgeleitet ist.Water heater according to claim 3, characterized in that the actuating force is derived from an actuator for a gas valve (low water protection) influenced by the flow of the water flowing through. Wassererhitzer nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß der Magnetanker (35) durch eine nach Beendigung der Wasserströmung wirksame Rückstellkraft in eine das Schließen des Sicherheitsventils (34) ermöglichende Ausgangsstellung zurückführbar ist.Water heater according to claim 3 or 4, characterized in that the magnetic armature (35) can be returned to an initial position which enables the safety valve (34) to be closed by an restoring force which is effective after the water flow has ended. Wassererhitzer nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß bei Zapfbeginn an die Magnetspule des Sicherheitsventils (34) parallel zur Thermospannung eine vom Zündgenerator (59) erzeugte Spannung zusätzlich angelegt ist.Water heater according to one of Claims 3 to 5, characterized in that, at the start of the tap, an additional voltage generated by the ignition generator (59) is applied to the solenoid of the safety valve (34) parallel to the thermal voltage. Wassererhitzer nach Anspruch 6, dadurch gekennzeichnet, daß ein vom Zündgenerator (59) gespeistes elektromagnetisches Gasventil vorgesehen ist.Water heater according to claim 6, characterized in that an electromagnetic gas valve fed by the ignition generator (59) is provided. Wasserarmatur nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Stellkräfte für ein Gasventil (13) aus den elektromagnetischen Axialkräften zwischen Anker und Stator des Zündgenerators (80) und/oder den hydraulischen Axialkräften eines Laufrads einer zum Antrieb des Zündgenerators (80) vorgesehenen Turbine (81) abgeleitet sind.Water fitting according to one of the preceding claims, characterized in that the actuating forces for a gas valve (13) from the electromagnetic axial forces between the armature and stator of the ignition generator (80) and / or the hydraulic axial forces of an impeller of a turbine provided for driving the ignition generator (80) (81) are derived.
EP95105165A 1994-05-04 1995-04-06 Gas-fitted instantaneous water heater Withdrawn EP0681147A1 (en)

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DE4415639A DE4415639A1 (en) 1994-05-04 1994-05-04 Gas-fired instantaneous water heater
DE4415639 1994-05-04

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GB2331578A (en) * 1997-11-21 1999-05-26 Triton Plc Water Heaters
WO2001025693A1 (en) * 1999-10-01 2001-04-12 Op Controls S.P.A. A valve unit for regulating the flow-rate of fuel gas in dependence on the flow-rate of water, particularly for water heaters
CN104807041A (en) * 2015-04-07 2015-07-29 东莞市海厨宝厨具有限公司 Pre-ignition type wax motor linkage control safety ignition system

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DE102005005678A1 (en) * 2005-02-08 2006-08-10 Robert Bosch Gmbh Gas-fired continuous water heater

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JPS58117915A (en) * 1982-01-07 1983-07-13 Matsushita Electric Ind Co Ltd Combustion controller
EP0108032A2 (en) * 1982-10-23 1984-05-09 Joh. Vaillant GmbH u. Co. Control device for a fuel-heated heat source
FR2562216A1 (en) * 1984-04-03 1985-10-04 Sdecc ARRANGEMENT MECHANISM WITH VARIABLE RIGIDITY FOR APPARATUS FOR INSTANTLY PRODUCING HOT WATER BY GAS
EP0240394A1 (en) * 1986-03-06 1987-10-07 Chaffoteaux & Maury Water or bath gas burner
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Cited By (4)

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Publication number Priority date Publication date Assignee Title
GB2331578A (en) * 1997-11-21 1999-05-26 Triton Plc Water Heaters
GB2331578B (en) * 1997-11-21 2001-05-02 Triton Plc Water heaters
WO2001025693A1 (en) * 1999-10-01 2001-04-12 Op Controls S.P.A. A valve unit for regulating the flow-rate of fuel gas in dependence on the flow-rate of water, particularly for water heaters
CN104807041A (en) * 2015-04-07 2015-07-29 东莞市海厨宝厨具有限公司 Pre-ignition type wax motor linkage control safety ignition system

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