EP0389782A2 - Control device for the gas supply to a burner of a gas-heated device, especially a geyser - Google Patents

Control device for the gas supply to a burner of a gas-heated device, especially a geyser Download PDF

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Publication number
EP0389782A2
EP0389782A2 EP19900103184 EP90103184A EP0389782A2 EP 0389782 A2 EP0389782 A2 EP 0389782A2 EP 19900103184 EP19900103184 EP 19900103184 EP 90103184 A EP90103184 A EP 90103184A EP 0389782 A2 EP0389782 A2 EP 0389782A2
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EP
European Patent Office
Prior art keywords
valve
gas
valve seat
closing member
main valve
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
EP19900103184
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German (de)
French (fr)
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EP0389782B1 (en
EP0389782A3 (en
Inventor
Hans Hoeness
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0389782A3 publication Critical patent/EP0389782A3/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

Definitions

  • the invention relates to a device for controlling the gas supply according to the preamble of the main claim.
  • the arrangement of a snap-in additional valve to the main valve prevents creeping release of small amounts of gas if the stroke actuator has only carried out a small actuating stroke in the case of severely restricted draw quantities or small setpoint deviations of the regulated water temperature.
  • the gas supply is only released when the actuating stroke of the stroke actuator corresponds at least approximately to the quantity of pilot gas required to safely ignite the entire burner.
  • the snap-opening and closing additional valve is arranged within the housing-shaped closing member of the main valve, which forms an inner annular shoulder on a valve seat for the additional valve, the closing member of which has its own closing spring and is influenced by a mechanical snap disk, via which the stroke actuator on both Ven tile acts.
  • This version consists of a large number of individual parts, the assembly of which requires considerable manufacturing effort.
  • a valve actuated by a bimetal thermostat is known, the resiliently suspended closure part of which carries a membrane which can be pivoted against a valve seat fixed to the housing and which is snapped onto by the venturi effect.
  • the arrangement according to the invention with the characterizing features of the main claim is distinguished from the known device of the generic type by a much simpler structure, which consists of fewer individual parts and requires less manufacturing effort when assembling the valves.
  • FIG. 1 shows, as a first embodiment, a longitudinal section through a device according to the invention, which is combined with a lack of water protection of a water heater
  • FIGS. 2 and 3 each show a partial longitudinal section through the second and third embodiment.
  • the device 10 according to FIG. 1 is attached to a low water protection device 11, which actuates the device 10 continuously or modulatingly in accordance with the water flow via a plunger 12.
  • the device 10 has a valve housing 13 with a gas inlet opening 14, which leads into an input chamber 15. This is closed at the top by an insert 16 which contains a bore 17 and has a flange 18 on which a rubber sealing collar 19 is clamped. This is provided on the upper end face with an annular bead 20 which forms a valve seat for a closing member 21, which is provided with an annular flange 21a pressed against the annular bead 20 by a closing spring 22.
  • the closing member 21 is provided with a central control body 24 which, in the closed position shown, dips into the bore 17 with a cylindrical section 25.
  • the cylindrical section 25 is followed by a conically tapered section 26 which passes through the bore 17 over the entire stroke of the closing member 21.
  • the closing member 21 is fixedly connected to an actuating rod 27 which is guided in the valve housing 13 and rests below on the plunger 12 of the low water protection device 11.
  • An outlet chamber 28 is formed downstream of the valve seat 20, from which the gas reaches the burner of the device.
  • the closing member 21 forms with the valve seat 20 a main valve, upstream of which a snap valve, generally designated by the reference number 32, is connected upstream as an additional valve.
  • a valve seat As a valve seat, this has an annular edge 33 formed on the closing member 21, which, as a sealing element, has a sealing lip 34 protruding freely inwards and integrally molded onto the sealing collar 19 is ordered.
  • the sealing lip 34 protrudes approximately horizontally from the sealing collar 19; the arrangement is such that in the closed position of the main valve 30, the sealing lip 34 is slightly bent downward relative to the undeformed position, so that essentially the inflow-side gas pressure presses the sealing lip 34 against the ring edge 33 with sufficient sealing force.
  • the device according to FIG. 1 works as follows:
  • the lack of water safety device 11 raises the closing member 21 more or less depending on the amount of water flowing through per unit of time via the plunger 12 and the actuating rod 27.
  • the main valve 30 is already opened with very small amounts of water, whereas the snap valve 32 only suddenly releases the gas passage when a sufficient amount of gas for safely igniting the burner can pass through the valves. This is achieved in that the sealing lip 34 is initially held tightly against the ring edge 33 of the closing member 21 under the influence of the inflow-side gas pressure.
  • the inflow-side gas pressure deforms the sealing lip 34 upwards, its restoring force increasing continuously until it can no longer be overcome by the gas pressure.
  • the sealing lip 34 then springs off from the ring edge 33 with elastic resilience and returns to its undeformed initial position, in which the gas path is released through the snap valve. Thereafter, the amount of gas passing through both valves is determined by the stroke of the closing member 21 in connection with the control gap released in the bore 17.
  • the arrangement can advantageously be such that when tearing off the sealing lip 34 from the ring edge 33 there is still the cylindrical section 25 of the control body 24 in the bore 17.
  • the ring edge 33 of the closing member 21 first approaches the undeformed sealing lip 34 until the flow at the sealing lip 34 pulls it against the ring edge 33.
  • the gas supply to the burner is suddenly interrupted, which is also desirable in view of the proper functioning of the device.
  • the closing member 21 comes to rest on the valve seat 20, after which the main valve 30 is closed.
  • a closing member 41 actuated by the actuating rod 27 is designed as a carrier of a sealing washer 42, which forms an elastically bendable sealing lip 44 which projects outward.
  • a valve housing 45 On a valve housing 45, two valve seats are provided by two ring edges 46 and 47 arranged concentrically to one another, of which the inner ring edge 46 is assigned to the inner ring region of the sealing disk 42, which is supported on an annular collar 48 of the closing member 41.
  • the inner ring edge 46 and the inner ring region of the sealing disk 42 together form a main valve 50, which is provided with a closing spring 49 acting in the gas flow direction.
  • the outer ring edge 47 is assigned to the sealing lip 44 and forms a snap valve 52 with it.
  • the ring edge 47 is axially offset from the inner ring edge 46 such that in the closed position of the main valve 50, the sealing lip 44 to a small extent from its unstressed initial position downward is turned.
  • the two valves 50, 52 have a control gap 53 in the gas path downstream, which is monitored by a control body 54 formed on the closing member 41 and ensures a linear relationship between the water flow rate and the gas volume supplied to the burner.
  • the closing member 41 When the gas supply is released, the closing member 41 is moved downward, the sealing lip 44 of the snap valve 52 initially remaining in contact with the ring edge 47 fixed to the housing under the influence of the inflow-side gas pressure in the chamber 55. After a certain partial stroke of the closing member 41, the sealing lip 44 tears off from the ring edge 47, as a result of which the small gas or ignition gas quantity corresponding to the partial stroke is suddenly released. When the valve closes, the sealing lip 44 is snapped onto the sealing edge 47 when the parts have approached each other at a certain distance, which is dependent on the gas pressure present.
  • the device according to FIG. 3 consists of a main valve 60 continuously actuated by the mechanical actuator 27, which is followed by a snap valve 62 as an additional valve in the flow path of the gas.
  • the snap valve 62 is provided, analogously to the two previously described embodiments, with a sealing lip 64 clamped on the inner ring edge, which cooperates with a valve seat 65 fixed to the housing on the outflow side of the gas.
  • the sealing lip 64 is fastened to a support body 66 which is slidably mounted in the valve housing and is coupled to a double-armed lever 68 which is rotatably mounted at 67.
  • an actuating rod 70 acts on it, which is firmly connected to a closing member 71 of the main valve 60.
  • the closing member 71 is pressed by a closing spring 72 against the direction of flow of the gas against a valve seat 73 fixed to the housing.
  • the snap valve 62 also keeps the gas path closed until the actuator 27 has opened the upstream main valve 60 to such an extent that a minimum or ignition gas quantity can be exceeded there. Thereafter, the lever 68 presses the support body 66 of the snap valve 62 down so far that the sealing lip 64 tears off the sealing seat 65 and releases the gas supply to the burner.
  • valves are actuated by a thermostat which influences the valves, for example, in accordance with the setpoint deviation of the water outlet temperature of a temperature-controlled gas hot water heater.
  • the snap valve has the function of a two-point controller in a work area in which the heat requirement is below the amount of ignition gas.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Control Of Combustion (AREA)

Abstract

In devices of the generic type, the gas supply to the burner of the device is only opened when the heat requirement predetermined by the drawing quantity or the deviation from setpoint of the regulated water temperature corresponds at least to the excess ignition gas quantity, in order to prevent a gradual opening of the valves. The known devices of the generic type are to be simplified with the current invention. To achieve this aim, a pneumatic snap valve (32, 52, 62) is provided in addition to a main valve (30, 50, 60), which can be combined with the latter in a space-saving and equipment-saving manner. Preferred area of application is gas-heated water heaters with constantly regulated outlet temperature. <IMAGE>

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Einrichtung zum Steuern der Gaszu­fuhr nach der Gattung des Hauptanspruchs. Durch die Anordnung eines schnappend arbeitenden Zusatzventils zum Hauptventil wird eine schleichende Freigabe von geringen Gasmengen verhindert, wenn bei stark gedrosselten Zapfmengen oder geringen Sollwertabweichungen der geregelten Wassertemperatur das Hubstellglied nur einen kleinen Stellhub ausgeführt hat. Die Gaszufuhr wird erst freigegeben, wenn der Stellhub des Hubstellgliedes mindestens annhähernd der zum sicheren Zünden des gesamten Brenners notwendigen Zündgasmenge ent­spricht. Bei einer bekannten Einrichtung der gattungsmäßigen Art (DE-PS 12 29 928) ist das schnappend öffnende und schließende Zu­satzventil innerhalb des gehäuseartig ausgebildeten Schließglieds des Hauptventils angeordnet, welches an einer inneren Ringschulter einen Ventilsitz für das Zusatzventil bildet, dessen Schließglied von einer eigenen Schließfeder und von einer mechanischen Schnapp­scheibe beeinflußt ist, über welche das Hubstellglied auf beide Ven­ tile einwirkt. Diese Ausführung besteht aus einer Vielzahl von Ein­zelteilen, deren Zusammenbau einen erheblichen Fertigungsaufwand be­dingt. Ferner ist aus der DE-PS 12 92 980 ein von einem Bimetall­thermostaten betätigtes Ventil bekannt, dessen federnd aufgehängtes Verschlußteil eine Membran trägt, die gegen einen gehäusefesten Ven­tilsitz schwenkbar ist und durch den Venturieffekt schnappend an diesen herangezogen wird.The invention relates to a device for controlling the gas supply according to the preamble of the main claim. The arrangement of a snap-in additional valve to the main valve prevents creeping release of small amounts of gas if the stroke actuator has only carried out a small actuating stroke in the case of severely restricted draw quantities or small setpoint deviations of the regulated water temperature. The gas supply is only released when the actuating stroke of the stroke actuator corresponds at least approximately to the quantity of pilot gas required to safely ignite the entire burner. In a known device of the generic type (DE-PS 12 29 928), the snap-opening and closing additional valve is arranged within the housing-shaped closing member of the main valve, which forms an inner annular shoulder on a valve seat for the additional valve, the closing member of which has its own closing spring and is influenced by a mechanical snap disk, via which the stroke actuator on both Ven tile acts. This version consists of a large number of individual parts, the assembly of which requires considerable manufacturing effort. Furthermore, from DE-PS 12 92 980 a valve actuated by a bimetal thermostat is known, the resiliently suspended closure part of which carries a membrane which can be pivoted against a valve seat fixed to the housing and which is snapped onto by the venturi effect.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs zeichnet sich gegenüber der bekannten Einrichtung der gattungsmäßigen Art durch einen wesentlich einfacheren Aufbau aus, der aus weniger Einzelteilen besteht und einen geringeren Ferti­gungsaufwand beim Zusammenbau der Ventile erfordert.The arrangement according to the invention with the characterizing features of the main claim is distinguished from the known device of the generic type by a much simpler structure, which consists of fewer individual parts and requires less manufacturing effort when assembling the valves.

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.

Zeichnungdrawing

Drei Ausführungsbeispiele der Erfindung sind in der Zeichnung dar­gestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 als erstes Ausführungsbeispiel einen Längsschnitt durch eine erfindungsgemäße Einrichtung, die mit einer Wassermangel­sicherung eines Warmwasserbereiters kombiniert ist, und die Figuren 2 und 3 je einen Teil-Längsschnitt durch das zweite und dritte Aus­führungsbeispiel.Three embodiments of the invention are shown in the drawing and explained in more detail in the following description. 1 shows, as a first embodiment, a longitudinal section through a device according to the invention, which is combined with a lack of water protection of a water heater, and FIGS. 2 and 3 each show a partial longitudinal section through the second and third embodiment.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die Einrichtung 10 nach Figur 1 ist auf einer Wassermangelsicherung 11 befestigt, welche die Einrichtung 10 nach Maßgabe des Wasser­durchflusses über einen Stößel 12 stetig bzw. modulierend betätigt. Die Einrichtung 10 hat ein Ventilgehäuse 13 mit einer Gaseinlaßöff­nung 14, die in eine Eingangskammer 15 führt. Diese ist oben durch einen Einsatz 16 abgeschlossen, der eine Bohrung 17 enthält und ei­nen Flansch 18 aufweist, auf den eine Dichtmanschette 19 aus Gummi aufgespannt ist. Diese ist auf der oberen Stirnseite mit einem Ring­wulst 20 versehen, der einen Ventilsitz für ein Schließglied 21 bil­det, welches mit einem durch eine Schließfeder 22 gegen den Ring­wulst 20 gedrückten Ringflansch 21a versehen ist.The device 10 according to FIG. 1 is attached to a low water protection device 11, which actuates the device 10 continuously or modulatingly in accordance with the water flow via a plunger 12. The device 10 has a valve housing 13 with a gas inlet opening 14, which leads into an input chamber 15. This is closed at the top by an insert 16 which contains a bore 17 and has a flange 18 on which a rubber sealing collar 19 is clamped. This is provided on the upper end face with an annular bead 20 which forms a valve seat for a closing member 21, which is provided with an annular flange 21a pressed against the annular bead 20 by a closing spring 22.

Das Schließglied 21 ist mit einem zentralen Regelkörper 24 versehen, der in der dargestellten Schließlage mit einem zylindrischen Ab­schnitt 25 in die Bohrung 17 taucht. An den zylindrischen Abschnitt 25 schließt sich ein konisch verjüngter Abschnitt 26 an, der über den gesamten Hub des Schließglieds 21 die Bohrung 17 durchsetzt. Das Schließglied 21 ist fest mit einer Stellstange 27 verbunden, die im Ventilgehäuse 13 geführt ist und unten auf dem Stößel 12 der Wasser­mangelsicherung 11 aufliegt. Stromab des Ventilsitzes 20 ist eine Ausgangskammer 28 gebildet, aus welcher das Gas zum Brenner des Ge­rätes gelangt.The closing member 21 is provided with a central control body 24 which, in the closed position shown, dips into the bore 17 with a cylindrical section 25. The cylindrical section 25 is followed by a conically tapered section 26 which passes through the bore 17 over the entire stroke of the closing member 21. The closing member 21 is fixedly connected to an actuating rod 27 which is guided in the valve housing 13 and rests below on the plunger 12 of the low water protection device 11. An outlet chamber 28 is formed downstream of the valve seat 20, from which the gas reaches the burner of the device.

Das Schließglied 21 bildet mit dem Ventilsitz 20 ein Hauptventil, welchem in Strömungsrichtung des Gases ein insgesamt mit der Bezugs­zahl 32 bezeichnetes Schnappventil als Zusatzventil vorgeschaltet ist. Dieses hat als Ventilsitz eine am Schließglied 21 gebildete Ringkante 33, welcher als Dichtelement eine einstückig an die Dicht­manschette 19 angeformte, frei nach innen ragende Dichtlippe 34 zu­ geordnet ist. Im unverformten Zustand steht die Dichtlippe 34 an­nähernd waagrecht von der Dichtmanschette 19 ab; die Anordnung ist so getroffen, daß in Schließstellung des Hauptventils 30 die Dicht­lippe 34 leicht gegenüber der unverformten Stellung nach unten abge­bogen ist, so daß im wesentlichen der zuströmseitige Gasdruck die Dichtlippe 34 mit ausreichender Dichtkraft an die Ringkante 33 an­drückt.The closing member 21 forms with the valve seat 20 a main valve, upstream of which a snap valve, generally designated by the reference number 32, is connected upstream as an additional valve. As a valve seat, this has an annular edge 33 formed on the closing member 21, which, as a sealing element, has a sealing lip 34 protruding freely inwards and integrally molded onto the sealing collar 19 is ordered. In the undeformed state, the sealing lip 34 protrudes approximately horizontally from the sealing collar 19; the arrangement is such that in the closed position of the main valve 30, the sealing lip 34 is slightly bent downward relative to the undeformed position, so that essentially the inflow-side gas pressure presses the sealing lip 34 against the ring edge 33 with sufficient sealing force.

Die Einrichtung nach Figur 1 arbeitet wie folgt:The device according to FIG. 1 works as follows:

Die Wassermangelsicherung 11 hebt je nach der pro Zeiteinheit durch­fließenden Wassermenge über den Stößel 12 und die Stellstange 27 das Schließglied 21 mehr oder weniger weit an. Dabei wird das Hauptven­til 30 zwar bereits bei sehr kleinen Wassermengen geöffnet, wogegen das Schnappventil 32 den Gasdurchgang schlagartig erst freigibt, wenn eine zum sicheren Zünden des Brenners ausreichende Gasmenge durch die Ventile hindurchtreten kann. Das ist dadurch erreicht, daß die Dichtlippe 34 zunächst unter dem Einfluß des zuströmseitigen Gasdruckes dicht an der Ringkante 33 des Schließglieds 21 angelegt gehalten wird.The lack of water safety device 11 raises the closing member 21 more or less depending on the amount of water flowing through per unit of time via the plunger 12 and the actuating rod 27. In this case, the main valve 30 is already opened with very small amounts of water, whereas the snap valve 32 only suddenly releases the gas passage when a sufficient amount of gas for safely igniting the burner can pass through the valves. This is achieved in that the sealing lip 34 is initially held tightly against the ring edge 33 of the closing member 21 under the influence of the inflow-side gas pressure.

Mit zunehmendem Hub des Schließgliedes 21 verformt der zuströmseiti­ge Gasdruck die Dichtlippe 34 nach oben, wobei deren Rückstellkraft stetig zunimmt, bis sie schließlich durch den Gasdruck nicht mehr überwunden werden kann. Danach springt die Dichtlippe 34 unter ela­stischer Rückfederung von der Ringkante 33 ab und in ihre unverform­te Ausgangsstellung zurück, in welcher der Gasweg durch das Schnapp­ventil freigegeben ist. Danach wird die durch beide Ventile hin­durchtretende Gasmenge durch den Hub des Schließglieds 21 in Verbin­dung mit dem in der Bohrung 17 freigegebenen Regelspalt bestimmt. Die Anordnung kann vorteilhaft so getroffen sein, daß beim Abreißen der Dichtlippe 34 von der Ringkante 33 sich noch der zylindrische Abschnitt 25 des Regelkörpers 24 in der Bohrung 17 befindet.With increasing stroke of the closing member 21, the inflow-side gas pressure deforms the sealing lip 34 upwards, its restoring force increasing continuously until it can no longer be overcome by the gas pressure. The sealing lip 34 then springs off from the ring edge 33 with elastic resilience and returns to its undeformed initial position, in which the gas path is released through the snap valve. Thereafter, the amount of gas passing through both valves is determined by the stroke of the closing member 21 in connection with the control gap released in the bore 17. The arrangement can advantageously be such that when tearing off the sealing lip 34 from the ring edge 33 there is still the cylindrical section 25 of the control body 24 in the bore 17.

Bei abnehmendem Wasserdurchfluß durch die Wassermangelsicherung 11 nähert sich zunächst die Ringkante 33 des Schließglieds 21 an die unverformte Dichtlippe 34 an, bis die Strömung an der Dichtlippe 34 diese gegen die Ringkante 33 zieht. Dadurch wird die Gaszufuhr zum Brenner schlagartig unterbrochen, was mit Rücksicht auf eine ein­wandfreie Funktion des Gerätes ebenfalls erwünscht ist. Nach einer leichten Verformung der Dichtlippe 34 in die in Figur 1 gezeigte Stellung kommt das Schließglied 21 zur Auflage auf den Ventilsitz 20, wonach auch das Hauptventil 30 geschlossen ist.With decreasing water flow through the lack of water protection 11, the ring edge 33 of the closing member 21 first approaches the undeformed sealing lip 34 until the flow at the sealing lip 34 pulls it against the ring edge 33. As a result, the gas supply to the burner is suddenly interrupted, which is also desirable in view of the proper functioning of the device. After a slight deformation of the sealing lip 34 in the position shown in Figure 1, the closing member 21 comes to rest on the valve seat 20, after which the main valve 30 is closed.

Bei der Ausführung nach Figur 2 ist ein von der Stellstange 27 betä­tigtes Schließglied 41 als Träger einer Dichtscheibe 42 ausgebildet, die eine frei nach außen wegstehende, elastisch biegbare Dichtlippe 44 bildet. An einem Ventilgehäuse 45 sind zwei Ventilsitze durch zwei konzentrisch zueinander angeordnete Ringkanten 46 und 47 vorge­sehen, von denen die innere Ringkante 46 dem inneren Ringbereich der Dichtscheibe 42 zugeordnet ist, welcher auf einem Ringbund 48 des Schließglieds 41 abgestützt ist. Die innere Ringkante 46 und der innere Ringbereich der Dichtscheibe 42 bilden zusammen ein Hauptven­til 50, welches mit einer in Gasströmungsrichtung wirkenden Schließ­feder 49 versehen ist.In the embodiment according to FIG. 2, a closing member 41 actuated by the actuating rod 27 is designed as a carrier of a sealing washer 42, which forms an elastically bendable sealing lip 44 which projects outward. On a valve housing 45, two valve seats are provided by two ring edges 46 and 47 arranged concentrically to one another, of which the inner ring edge 46 is assigned to the inner ring region of the sealing disk 42, which is supported on an annular collar 48 of the closing member 41. The inner ring edge 46 and the inner ring region of the sealing disk 42 together form a main valve 50, which is provided with a closing spring 49 acting in the gas flow direction.

Die äußere Ringkante 47 ist der Dichtlippe 44 zugeordnet und bildet mit dieser ein Schnappventil 52. Die Ringkante 47 ist derart axial gegenüber der inneren Ringkante 46 versetzt angeordnet, daß in Schließlage des Hauptventils 50 die Dichtlippe 44 in einem geringen Ausmaß aus ihrer unverspannten Ausgangsstellung nach unten abgebogen ist. Den beiden Ventilen 50, 52 ist ein Regelspalt 53 im Gasweg nachgeschaltet, der durch einen am Schließglied 41 gebildeten Regel­körper 54 überwacht ist und für einen linearen Zusammenhang zwischen der Wasserdurchflußmenge und der dem Brenner zugeführten Gasmenge sorgt.The outer ring edge 47 is assigned to the sealing lip 44 and forms a snap valve 52 with it. The ring edge 47 is axially offset from the inner ring edge 46 such that in the closed position of the main valve 50, the sealing lip 44 to a small extent from its unstressed initial position downward is turned. The two valves 50, 52 have a control gap 53 in the gas path downstream, which is monitored by a control body 54 formed on the closing member 41 and ensures a linear relationship between the water flow rate and the gas volume supplied to the burner.

Beim Freigeben der Gaszufuhr wird das Schließglied 41 nach unten be­wegt, wobei zunächst die Dichtlippe 44 des Schnappventils 52 unter dem Einfluß des zuströmseitigen Gasdrucks in der Kammer 55 an der gehäusefesten Ringkante 47 angelegt bleibt. Nach einem bestimmten Teilhub des Schließglieds 41 reißt die Dichtlippe 44 von der Ring­kante 47 ab, wodurch die dem Teilhub entsprechende Klein­gas- bzw. Überzündgasmenge schlagartig freigegeben wird. Beim Schließen des Ventils wird die Dichtlippe 44 schnappend an die Dichtkante 47 herangezogen, wenn sich die Teile auf eine bestimmte, vom anstehenden Gasdruck abhängige Distanz aneinander angenähert haben.When the gas supply is released, the closing member 41 is moved downward, the sealing lip 44 of the snap valve 52 initially remaining in contact with the ring edge 47 fixed to the housing under the influence of the inflow-side gas pressure in the chamber 55. After a certain partial stroke of the closing member 41, the sealing lip 44 tears off from the ring edge 47, as a result of which the small gas or ignition gas quantity corresponding to the partial stroke is suddenly released. When the valve closes, the sealing lip 44 is snapped onto the sealing edge 47 when the parts have approached each other at a certain distance, which is dependent on the gas pressure present.

Die Einrichtung nach Figur 3 besteht aus einem über das mechanische Stellglied 27 stetig betätigten Hauptventil 60, welchem ein Schnapp­ventil 62 als Zusatzventil im Strömungsweg des Gases nachgeschaltet ist. Das Schnappventil 62 ist analog zu den beiden vorbeschriebenen Ausführungen mit einer am inneren Ringrand eingespannten Dichtlippe 64 versehen, welche mit einem auf der Abströmseite des Gases ange­ordneten gehäusefesten Ventilsitz 65 zusammenarbeitet. Die Dichtlip­pe 64 ist an einem Tragkörper 66 befestigt, der verschiebbar im Ven­tilgehäuse gelagert und mit einem bei 67 drehbar gelagerten doppel­armigen Hebel 68 gekoppelt ist. Auf diesen wirkt andererseits eine Stellstange 70 ein, die mit einem Schließglied 71 des Hauptventils 60 fest verbunden ist. Das Schließglied 71 ist von einer Schließfe­der 72 entgegen der Durchströmrichtung des Gases gegen einen gehäu­sefesten Ventilsitz 73 gedrückt.The device according to FIG. 3 consists of a main valve 60 continuously actuated by the mechanical actuator 27, which is followed by a snap valve 62 as an additional valve in the flow path of the gas. The snap valve 62 is provided, analogously to the two previously described embodiments, with a sealing lip 64 clamped on the inner ring edge, which cooperates with a valve seat 65 fixed to the housing on the outflow side of the gas. The sealing lip 64 is fastened to a support body 66 which is slidably mounted in the valve housing and is coupled to a double-armed lever 68 which is rotatably mounted at 67. On the other hand, an actuating rod 70 acts on it, which is firmly connected to a closing member 71 of the main valve 60. The closing member 71 is pressed by a closing spring 72 against the direction of flow of the gas against a valve seat 73 fixed to the housing.

Das Schnappventil 62 hält auch bei dieser Ausführung den Gasweg ge­schlossen, bis das Stellglied 27 das vorgeschaltete Hauptventil 60 so weit geöffnet hat, daß dort eine Mindest- bzw. Überzündgasmenge übertreten kann. Danach drückt der Hebel 68 den Tragkörper 66 des Schnappventil 62 so weit nach unten, daß die Dichtlippe 64 vom Dichtsitz 65 abreißt und die Gaszufuhr zum Brenner freigibt.In this embodiment, the snap valve 62 also keeps the gas path closed until the actuator 27 has opened the upstream main valve 60 to such an extent that a minimum or ignition gas quantity can be exceeded there. Thereafter, the lever 68 presses the support body 66 of the snap valve 62 down so far that the sealing lip 64 tears off the sealing seat 65 and releases the gas supply to the burner.

In allen drei beschriebenen Ausführungsbeispielen des Erfindungsge­genstandes kann - wie bei der Anordnung nach Figur 1 - eine Wasser­mangelsicherng bzw. ein Wasserschalter zur Betätigung der Ventile vorgesehen sein. Eine andere vorteilhafte Kombination ergibt sich, wenn die Ventile durch einen Thermostaten betätigt werden, der die Ventile beispielsweise nach Maßgabe der Sollwertabweichung der Was­serauslauftemperatur eines temperaturgeregelten Gas-Heißwasserbe­reiters beeinflußt. In diesem Fall erhält das Schnappventil die Funktion eines Zweipunktreglers in einem Arbeitsbereich, in welchem der Wärmebedarf unter der Überzündgasmenge liegt.In all three described exemplary embodiments of the subject matter of the invention - as in the arrangement according to FIG. 1 - a lack of water protection or a water switch can be provided for actuating the valves. Another advantageous combination results if the valves are actuated by a thermostat which influences the valves, for example, in accordance with the setpoint deviation of the water outlet temperature of a temperature-controlled gas hot water heater. In this case, the snap valve has the function of a two-point controller in a work area in which the heat requirement is below the amount of ignition gas.

Claims (11)

1. Einrichtung zum Steuern der Gaszufuhr zu einem Brenner eines gas­beheizten Geräts, insbesondere eines Durchlauf-Wassererhitzers, mit einem Hauptventil, dessen Schließglied mit einem Wärmebedarfsgeber, wie Thermostat oder Wassermangelsicherung, über ein Hubstellglied gekoppelt ist und im Zusammenwirken mit einem gehäusefesten Ventil­sitz die Gaszufuhr in einem oberen Leistungsbereich beeinflußt, der einerseits durch die Nennleistung des Gerätes und andererseits durch eine zum sicheren und vollständigen Zünden des Brenners mindestens erforderliche Zündleistung begrenzt ist, und ferner mit einem Zu­satzventil, das die Gaszufuhr in einem unteren Leistungsbereich be­einflußt und bei vorgegebenen Stellungen des Hubstellglieds schnap­pend öffnet und schließt, dadurch gekennzeichnet, daß das Zusatzven­til (32, 52, 62) ein elastisch verformbares Dichtelement in Gestalt einer von einem Tragkörper (16, 41, 66) frei abstehenden Dichtlippe (34, 44, 64) hat, die durch den zuströmseitigen Gasdruck gegen einen Ventilsitz (33, 47, 65) des Zusatzventils (32, 52, 62) gedrückt und derart bemessen ist, daß sie sich beim Bewegen des Hubstellglieds (27) in Öffnungsrichtung durch ihre Rückstellkraft entgegen dem Gas­druck vom Ventilsitz (33, 47, 65) schnappend ablöst, wenn das Hub­stellglied (27) einen der Zündleistung entsprechenden Öffnungshub zurückgelegt hat, und daß die vom Ventilsitz (33, 47, 65) abgelöste Dichtlippe (34, 44, 64) durch aus der Gasströmung abgeleitete Kräfte an den Ventilsitz (33, 47, 65) schnappend herangezogen wird, wenn sie sich bei der Schließbewegung des Hubstellglieds (27) bis auf ei­nen bestimmten Abstand an den Ventilsitz (33, 47, 65) angenähert hat.1.Device for controlling the gas supply to a burner of a gas-heated device, in particular a once-through water heater, with a main valve, the closing element of which is coupled to a heat demand device, such as a thermostat or low-water safety device, via a stroke actuator and, in cooperation with a valve seat fixed to the housing, the gas supply in influenced an upper power range, which is limited on the one hand by the nominal power of the device and on the other hand by an ignition power required at least for safe and complete ignition of the burner, and also with an additional valve that influences the gas supply in a lower power range and snaps at given positions of the stroke actuator opens and closes, characterized in that the additional valve (32, 52, 62) has an elastically deformable sealing element in the form of a sealing lip (34, 44, 64) which projects freely from a supporting body (16, 41, 66) and which flows through the inflow side n Gas pressure is pressed against a valve seat (33, 47, 65) of the additional valve (32, 52, 62) and is dimensioned such that when the stroke actuator (27) moves in the opening direction, its restoring force counteracts the gas pressure from the valve seat (33, 47, 65) snaps off when the stroke actuator (27) has an opening stroke corresponding to the ignition power and that the sealing lip (34, 44, 64) detached from the valve seat (33, 47, 65) is snapped onto the valve seat (33, 47, 65) by forces derived from the gas flow when it moves during the closing movement the stroke actuator (27) has approached the valve seat (33, 47, 65) up to a certain distance. 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Tragkörper (16, Figur 1) des Zusatzventils (32) gehäusefest angeord­net und dessen Venilsitz (33) am Schließglied (21) des Hauptventils (30) gebildet ist.2. Device according to claim 1, characterized in that the support body (16, Figure 1) of the additional valve (32) arranged fixed to the housing and the Venilsitz (33) on the closing member (21) of the main valve (30) is formed. 3. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Tragkörper (16) des Zusatzventils (32) zugleich den gehäusefesten Ventilsitz (18, 20) des Hauptventils (30) bildet bzw. trägt.3. Device according to claim 2, characterized in that the supporting body (16) of the additional valve (32) at the same time forms or carries the valve seat (18, 20) of the main valve (30). 4. Einrichtung nach einem der Ansprüche 1 bis 3, dadurch gekenn­zeichnet, daß die Dichtlippe (34, Figur 1) des Schnappventils (32) einstückig an einer Gummimanschette (19) angeformt ist, die über ei­nen Ringflansch (18) des Tragkörpers (16) gespannt ist und auf einer Stirnseite mit einem Ringwulst (20) am Ventilsitz des Hauptventils (30) versehen ist.4. Device according to one of claims 1 to 3, characterized in that the sealing lip (34, Figure 1) of the snap valve (32) is integrally formed on a rubber sleeve (19) which via an annular flange (18) of the support body (16) is tensioned and is provided on one end face with an annular bead (20) on the valve seat of the main valve (30). 5. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Schließglied (41, Figur 2) des Hauptventils (50) zugleich den Trag­körper des Zusatzventils (52) bildet, dessen Ventilsitz (47) gehäu­sefest angeordnet ist.5. Device according to claim 1, characterized in that the closing member (41, Figure 2) of the main valve (50) also forms the supporting body of the additional valve (52), the valve seat (47) is arranged fixed to the housing. 6. Einrichtung nach Anspruch 5, dadurch gekennzeichnet, daß das Schließglied (41) eine Dichtscheibe (42) trägt, deren frei abstehen­der äußerer Ringrand die Dichtlippe (44) des Zusatzventils (52) bil­det, wogegen der innere Ringrand der Dichtscheibe (42) an einer Ringschulter (48) des Schließglieds (41) abgestützt und dem Ventil­sitz (46) des Hauptventils (50) zugeordnet ist.6. Device according to claim 5, characterized in that the closing member (41) carries a sealing washer (42), the freely projecting outer ring edge of which forms the sealing lip (44) of the additional valve (52), whereas the inner ring edge of the sealing washer (42) an annular shoulder (48) of the closing member (41) is supported and is assigned to the valve seat (46) of the main valve (50). 7. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Tragkörper (66, Figur 3) des Zusatzventils (62) mit dem Schließglied (71) des Hauptventils (60) über einen vorzugsweise doppelarmigen He­bel (68) gekoppelt ist.7. Device according to claim 1, characterized in that the supporting body (66, Figure 3) of the additional valve (62) with the closing member (71) of the main valve (60) via a preferably double-armed lever (68) is coupled. 8. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch ge­kennzeichnet, daß das Zusatzventil (32, 52, 62) in Reihe mit dem Hauptventil (30, 50, 60) im Gasweg angeordnet ist (Figuren 1 bis 3).8. Device according to one of the preceding claims, characterized in that the additional valve (32, 52, 62) is arranged in series with the main valve (30, 50, 60) in the gas path (Figures 1 to 3). 9. Einrichtung nach Anspruch 8, dadurch gekennzeichnet, daß das Schließglied (21, 41, 71) des Hauptventils (30, 50, 60) mit einem in eine Gasdurchgangsbohrung (17) mit Spiel eintauchenden Regelkörper (25, 26, 54) versehen ist, der einen freien Querschnitt der Gas­durchgangsbohrung (17) hubabhängig steuert.9. Device according to claim 8, characterized in that the closing member (21, 41, 71) of the main valve (30, 50, 60) is provided with a regulating body (25, 26, 54) immersed in a gas passage bore (17) with play which controls a free cross section of the gas passage bore (17) depending on the stroke. 10. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch ge­kennzeichnet, daß das Hubstellglied (27) von einem vom Wasserdurch­fluß durch das Gerät gesteuerten Wasserschalter (11, Figur 1) beein­flußt ist.10. Device according to one of the preceding claims, characterized in that the stroke actuator (27) is influenced by a water switch (11, Figure 1) controlled by the water flow through the device. 11. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch ge­kennzeichnet, daß das Hubstellglied (27) von einem die Temperatur des im Gerät erwärmten Wassers erfassenden Thermostaten beeinflußt ist.11. Device according to one of the preceding claims, characterized in that the stroke actuator (27) is influenced by a thermostat which detects the temperature of the water heated in the device.
EP90103184A 1989-03-29 1990-02-20 Control device for the gas supply to a burner of a gas-heated device, especially a geyser Expired - Lifetime EP0389782B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3910111 1989-03-29
DE3910111A DE3910111C1 (en) 1989-03-29 1989-03-29

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EP0389782A2 true EP0389782A2 (en) 1990-10-03
EP0389782A3 EP0389782A3 (en) 1991-05-02
EP0389782B1 EP0389782B1 (en) 1993-07-07

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EP90103184A Expired - Lifetime EP0389782B1 (en) 1989-03-29 1990-02-20 Control device for the gas supply to a burner of a gas-heated device, especially a geyser

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EP (1) EP0389782B1 (en)
DE (2) DE3910111C1 (en)
ES (1) ES2042097T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4220579A1 (en) * 1992-06-24 1994-01-05 Mertik Regelungstechnik Gmbh Gas control for geyser gas and water armature - consists of control valve in gas part closed by spring pressure and activated by tappet rod operated by mechanism in water part

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2333775A (en) * 1938-07-08 1943-11-09 Honeywell Regulator Co Control valve
DE1229928B (en) * 1964-12-23 1966-12-08 Junkers & Co Thermostatically controlled gas valve
DE1292980B (en) * 1962-03-02 1969-04-17 Essex Wire Corp Valve operated by a heated bimetal thermostat
DE2642483B1 (en) * 1976-09-17 1978-03-02 Vaillant Joh Kg Gas valve for gas water heater - has cylindrical part with seatings for both safety valve and main burner valve
FR2400152A1 (en) * 1977-08-08 1979-03-09 Honeywell Inc FLUID FLOW CONTROL VALVE

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2333775A (en) * 1938-07-08 1943-11-09 Honeywell Regulator Co Control valve
DE1292980B (en) * 1962-03-02 1969-04-17 Essex Wire Corp Valve operated by a heated bimetal thermostat
DE1229928B (en) * 1964-12-23 1966-12-08 Junkers & Co Thermostatically controlled gas valve
DE2642483B1 (en) * 1976-09-17 1978-03-02 Vaillant Joh Kg Gas valve for gas water heater - has cylindrical part with seatings for both safety valve and main burner valve
FR2400152A1 (en) * 1977-08-08 1979-03-09 Honeywell Inc FLUID FLOW CONTROL VALVE

Also Published As

Publication number Publication date
EP0389782B1 (en) 1993-07-07
DE3910111C1 (en) 1990-06-13
DE59001897D1 (en) 1993-08-12
ES2042097T3 (en) 1993-12-01
EP0389782A3 (en) 1991-05-02

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