EP0834043B1 - Flow control, specially for an instantaneous water heater - Google Patents

Flow control, specially for an instantaneous water heater Download PDF

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Publication number
EP0834043B1
EP0834043B1 EP95923262A EP95923262A EP0834043B1 EP 0834043 B1 EP0834043 B1 EP 0834043B1 EP 95923262 A EP95923262 A EP 95923262A EP 95923262 A EP95923262 A EP 95923262A EP 0834043 B1 EP0834043 B1 EP 0834043B1
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EP
European Patent Office
Prior art keywords
water
gas
control housing
shaft
lever
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95923262A
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German (de)
French (fr)
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EP0834043A1 (en
Inventor
Klaus Schulze
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.)
Maxitrol GmbH and Co KG
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Mertik Maxitrol GmbH and Co KG
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Publication of EP0834043A1 publication Critical patent/EP0834043A1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • F23N1/08Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F23N1/087Regulating fuel supply conjointly with another medium, e.g. boiler water using mechanical means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00Measuring
    • F23N2225/04Measuring pressure
    • F23N2225/06Measuring pressure for determining flow
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00Valves, nozzles or pumps
    • F23N2235/12Fuel valves
    • F23N2235/16Fuel valves variable flow or proportional valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00Valves, nozzles or pumps
    • F23N2235/12Fuel valves
    • F23N2235/20Membrane valves
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/2496Self-proportioning or correlating systems
    • Y10T137/2511Fuel controlled by boiler or water system condition

Definitions

  • the present invention relates to a valve, as in particular for a once-through water heater to control the gas passage depending on the water flow.
  • Such fittings for continuous water heaters usually exist from a gas and a water part.
  • the Throttle control operated by a hydraulic actuator that is dependent a certain stroke depending on the amount of water flowing through Control of the amount of gas generated.
  • the stroke usually only starts at one certain minimum amount, which is necessary for igniting the burner Minimum amount of gas is set and ends with a certain one Maximum amount due to the technical design of the gas burner and the heat exchanger is determined.
  • the invention is based on the problem of a valve of the type mentioned develop in which the formation of limescale on the water-bearing Protruding plunger diminished and the influence of such Limescale deposits on the control behavior, as described in detail above, is completely turned off.
  • the problem is solved in that in the water-carrying housing the control movement of the membrane is transmitted to a lever, the The fulcrum is a tightly connected, sealed bearing and is connected to this lever Outside of the water-bearing housing forms the leading shaft.
  • the shaft also forms the fulcrum for a second one also firmly connected levers. It is between the second lever and a sealed plunger, which in a manner known per se Control movement in the gas-carrying housing by means of stroke movement transmits Push rod element arranged, whereby the rotary movement back into a Stroke movement to control the gas passage is converted.
  • the shaft By converting the stroke movement of the membrane into a rotary movement the shaft is achieved that the sealing element required for sealing, usually a 0-ring, the shaft always seals in the same place. An axial Movement no longer occurs in the sealing area. This means that the one that has occurred so far is no longer required Transport of water particles from the water-carrying space and the so associated negative consequences. Even if there is a leakage flow despite that between the water-bearing housing and the shaft seal should occur and limescale build up on the outer end of the shaft these have no influence on the bearing friction and the control behavior.
  • the fitting according to the invention is advantageously carried out so that the second lever outside the water-bearing housing in one piece with the shaft connected is.
  • the shaft sealed in the interior of the gas-carrying housing leads in the the second lever is arranged so that the transmission of the control movement of the outside in the gas-carrying housing also no longer takes place axially.
  • the shaft is then advantageously designed in two parts, a first part of the Shaft leads from the interior of the water-carrying housing to the outside, whereas a second part of the shaft from the interior of the gas-carrying housing leads to the outside
  • the water-carrying housing 2 contains, among others, known to those skilled in the art and therefore not explained further here, because it is not essential to the invention Components, a flow switch 21, which acts as a low water indicator serves.
  • This flow switch 21 has a high-pressure chamber 22 and a low pressure chamber 23, both through a membrane 24 are separated from each other.
  • the membrane 24 is supported on a membrane plate 25 from.
  • the low pressure chamber 23 is closed by a cover 26, which is connected on the one hand to the water-carrying housing 2, and on the other hand partially chambered by the gas-carrying housing 1 is.
  • a compression spring 27 is supported, which with its other End rests on the diaphragm plate 25.
  • a cranked lever is supported on the diaphragm plate 25 3 from, the other end tightly sealed with one in the cover 26 but rotatably mounted shaft 4 is connected.
  • the shaft 4 forms at the same time a fulcrum for a second lever 5, it being advantageous is when shaft 4 and lever 5 are made in one piece in the form of a bracket 6 are (Fig. 3).
  • the gas-carrying housing 1 contains, among others, also to the person skilled in the art known and therefore not here, because not essential to the invention further explained components, a gas quantity control valve 11.
  • the gas quantity control valve 11 is located in a pot-shaped space 13, in the latter Bottom 14 is an otherwise gastight guide 15 for one in the axial Direction of the cup-shaped space 13 longitudinally movable plunger 12 with the valve plate 111 of the gas quantity control valve 11 is connected.
  • the valve disk 111 is closed by a return spring 112 loaded, which is supported with its other end on the floor 14.
  • the plunger 12 On his the gas flow control valve 11 facing away from the end with the Surrounding space 16 of the otherwise gas-carrying Protrudes housing 1, the plunger 12 has a notch 121, which for Attachment of a push rod element 17 is used.
  • the push rod element 17 is U-shaped in this embodiment trained molded part.
  • a threaded bore 171 which for receiving a longitudinally adjustable element, for example a screw 174 is used.
  • one of the two legs is extended executed and bent at its end 172.
  • a recess in the axial extension of the bore 174 173 which serves to receive the notch 121 of the plunger 12.
  • the gas quantity control valve 11 also becomes the size of the differential pressure more or less open. So in Fig. 2 is the maximum opening of the Gas flow control valve 11 shown, but it is understood that intermediate positions possible are.
  • the screw 174 takes over this task, whose screw-in depth can be varied as desired through the opening 175 can.
  • valve according to the invention is of course not on the illustrated Embodiment limited. Rather, there are changes and modifications possible without leaving the scope of the invention.
  • the shaft 4 is sealed in the interior of the gas-carrying Housing 1 are performed, it being understood that then the lever 5 must be arranged in the interior of the gas-carrying housing 1.
  • the shaft 4 can be designed in two parts, a first part the shaft 4 from the interior of the water-bearing housing 2 to the outside leads, whereas a second part of the shaft 4 from the interior of the gas-carrying housing 1 leads to the outside.
  • a desired option for adjustment is then conveniently between the Implementation from the water-carrying housing 2 and the implementation from the gas-carrying housing 1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Driven Valves (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Rotary Presses (AREA)

Description

Technisches GebietTechnical field

Die vorliegende Erfindung bezieht sich auf eine Armatur, wie sie insbesondere für einen Durchlauf-Wassererhitzer zur Steuerung des Gasdurchlasses in Abhängigkeit vom Wasserdurchlauf Anwendung findet. Dabei weist die Armatur ein gasführendes Gehäuse, ein wasserführendes Gehäuse und eine mechanische Übertragung, die eine vom Wasserdurchlauf abhängige und vorzugsweise durch jeweils eine im wasserführenden Gehäuse untergebrachte Venturidüse und eine Membran bewirkte Steuerbewegung zunächst aus dem Innenraum des wasserführenden Gehäuses an die Außenseite und sodann von dort in das gasführende Gehäuse auf ein die Gasmenge steuerndes Ventil überträgt, auf.The present invention relates to a valve, as in particular for a once-through water heater to control the gas passage depending on the water flow. The Fitting a gas-carrying housing, a water-carrying housing and a mechanical transmission, which is dependent on the water flow and preferably by one housed in the water-carrying housing Venturi nozzle and a membrane initially caused the control movement the interior of the water-bearing housing to the outside and then thence into the gas-carrying housing on a gas quantity controlling Valve transmits on.

Stand der TechnikState of the art

Derartige Armaturen für Durchlauf-Wassererhitzer bestehen üblicherweise aus einem Gas- und einem Wasserteil. Bei diesen Armaturen wird die Gassteuerung von einem hydraulischen Stellantrieb betätigt, der abhängig von der jeweils durchfließenden Wassermenge einen bestimmten Hub zur Steuerung der Gasmenge erzeugt. Dabei beginnt der Hub meist erst ab einer bestimmten Minimalmenge, die durch die zum Zünden des Brenners notwendige Mindestmenge an Gas festgelegt ist, und endet mit einer bestimmten Maximalmenge, die durch die technische Auslegung des Gasbrenners und des Wärmetauschers bestimmt wird.Such fittings for continuous water heaters usually exist from a gas and a water part. With these fittings, the Throttle control operated by a hydraulic actuator that is dependent a certain stroke depending on the amount of water flowing through Control of the amount of gas generated. The stroke usually only starts at one certain minimum amount, which is necessary for igniting the burner Minimum amount of gas is set and ends with a certain one Maximum amount due to the technical design of the gas burner and the heat exchanger is determined.

Wie bereits weiter oben ausgeführt und beispielsweise in der DE-PS 647 449 dargestellt, befindet sich im Wasserteil eine Steuervorrichtung, die eine Membran aufweist, durch die das Schaltergehäuse in Kammern unterteilt wird, die über Leitungen mit Teilen der Flüssigkeitsleitung, die vor und hinter einer Drossel liegen, in Verbindung stehen. Im Gasteil befindet sich ein Gasdruckschalter, der ein Ventil mit einem Ventilkörper besitzt, der von einer weiteren Membran bewegt wird. Die Membran wird durch Druckunterschiede gesteuert, die durch eine Drossel in einer zum Brenner führenden Gaszuleitung hervorgerufen werden. Die Steuervorrichtung ist über eine Stange mit einem zur Drossel zugehörigen Ventilkörper verbunden.As already explained above and for example in DE-PS 647 449, there is a control device in the water part, the one Has membrane through which the switch housing is divided into chambers will, the lines with parts of the liquid line, the front and rear a throttle, communicate. There is a in the gas section Gas pressure switch, which has a valve with a valve body by a another membrane is moved. The membrane is caused by pressure differences controlled by a throttle in a leading to the burner Gas supply can be caused. The control device is via a Rod connected to a valve body associated with the throttle.

Eine weitere Armatur eines Durchlauf-Wassererhitzers ist in der WO 94/00716 beschrieben. Auch hier befindet sich im Wasserteil eine als Strömungsschalter bezeichnete Steuervorrichtung, die als Wassermangelsicherung dient. Dieser Strömungsschalter weist eine Hochdruckkammer und eine Niederdruckkammer auf, die beide durch eine Membran voneinander getrennt sind. Die Membran stützt sich an einem Membranteller ab, der fest mit einem Stößel verbunden ist, der seinerseits abgedichtet aus der Niederdruckkammer herausgeführt ist. Dabei bilden Membran, Membranteller und Stößel den hydraulischen Stellantrieb für ein im Gasteil angeordnetes Gasmengensteuerventil.Another fitting of a once-through water heater is in WO 94/00716. Here too there is a flow switch in the water section designated control device, the lack of water protection serves. This flow switch has a high pressure chamber and a Low pressure chamber, both separated by a membrane are. The membrane is supported on a membrane plate that is firm is connected to a plunger, which in turn seals from the low pressure chamber is brought out. Thereby form membrane, membrane plate and Tappet the hydraulic actuator for a gas quantity control valve arranged in the gas part.

Der Aufbau dieser in den o.g. Patentschriften beschriebenen Armaturen weist das Problem auf, daß der zur Hubübertragung dienende Stößel eine axiale Bewegung ausführt. Durch diese axiale Bewegung nimmt der Stößel trotz der vorhandenen Abdichtung Wasserteilchen mit heraus. Um zu verhindern, daß diese Wasserteilchen in den gasführenden Raum gelangen können, ist es üblicherweise bereits vorgesehen, daß zwischen dem wasserführenden und dem gasführenden Raum ein luftführender Raum vorhanden sein muß. Zusätzlich wird der Stößel zweigeteilt ausgeführt. Es bleibt aber das Problem, daß bei steigendem Stößelhub, hervorgerufen durch eine steigende Wasserentnahme, durch die axiale Bewegung und unterstützt vom Wasserdruck ein Wasserfilm am Stößel nach außen transportiert wird. Dieser Wasserfilm verdunstet an der Luft und führt zu Kalkablagerungen am Stößel. Beim Rückgang des Stößels, hervorgerufen durch eine sinkende Wasserentnahme, wird dieser Kalkbelag durch die Dichtung gezogen, was zur Schädigung der Dichtung und damit zu einem stärkeren Leckfluß bei den weiteren Wasserentnahmen führt. Weiterhin vergrößert sich durch die zunehmende Reibung des Stößels die Regelabweichung des Durchlauf-Wassererhitzers. Insbesondere wird bei Verringerung der durchströmenden Wassermenge die Gasmenge nicht mehr im erforderlichen Maße verringert, was zu Übertemperaturen des Wassers mit den damit verbundenen Gefährdungen des Nutzers führt. Die auftretende Kalkablagerung kann soweit fortschreiten, daß das Gasmengensteuerventil bei vollkommen abgesperrtem Wasserzulauf offen bleibt, was zur Zerstörung des Durchlauf-Wassererhitzers führt, sofern nicht ein gesonderter Übertemperaturschutz vorhanden ist.The structure of these in the above Fittings described fittings has the problem that the plunger used for the transmission of a stroke executes axial movement. Due to this axial movement, the ram takes despite the existing seal, water particles are also removed. To prevent, that these water particles can get into the gas-carrying space, it is usually already provided that between the water and there is an air-carrying space in the gas-carrying space got to. In addition, the plunger is made in two parts. But it remains Problem that with increasing ram stroke, caused by an increasing Water withdrawal, through the axial movement and supported by water pressure a film of water on the ram is transported outside. This water film evaporates in the air and leads to limescale deposits on the ram. When the ram drops, caused by a decrease in water consumption, this limescale is pulled through the seal, causing damage the seal and thus to a stronger leakage flow in the others Water withdrawals. Further increases by increasing Friction of the tappet is the control deviation of the once-through water heater. In particular, when reducing the amount of water flowing through The amount of gas is no longer reduced to the required extent, leading to excess temperatures of the water with the associated dangers to the user leads. The limescale that occurs can progress so far that the gas volume control valve is open when the water supply is completely shut off remains, which leads to the destruction of the once-through water heater, unless one separate overtemperature protection is available.

Durch Fettvorlagen, doppelte Dichtungen und Keramikführungen kann man diese negativen Folgen zwar hinaus zögern, der Wassertransport durch die axiale Bewegung des Stößels aber bleibt und führt somit irgendwann zum Ausfall. Solche Maßnahmen haben desweiteren den Nachteil, daß sich die Baumaße und letztendlich auch die Kosten erhöhen.You can do this with grease pads, double seals and ceramic guides Although the negative consequences are delayed, the water transport through the axial movement but the plunger remains and thus eventually leads to failure. Such Measures also have the disadvantage that the dimensions and ultimately also increase costs.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt das Problem zugrunde, eine Armatur der genannten Art zu entwickeln, bei der die Bildung von Kalkablagerungen auf dem aus dem wasserführenden Gehäuse herausragenden Stößel vermindert und der Einfluß solcher Kalkablagerungen auf das Regelverhalten, wie weiter oben ausführlich beschrieben, vollkommen ausgeschaltet wird.The invention is based on the problem of a valve of the type mentioned develop in which the formation of limescale on the water-bearing Protruding plunger diminished and the influence of such Limescale deposits on the control behavior, as described in detail above, is completely turned off.

Erfindungsgemäß wird das Problem dadurch gelöst, daß im wasserführenden Gehäuse die Steuerbewegung der Membran auf einen Hebel übertragen wird, dessen Drehpunkt eine fest mit diesem Hebel verbundene, abgedichtet gelagerte und zur Außenseite des wasserführenden Gehäuses führende Welle bildet. Somit wird die Hubbewegung des ersten Hebels mittels der Welle als Drehbewegung zur Außenseite übertragen. Weiterhin bildet die Welle den Drehpunkt für einen zweiten ebenfalls fest mit ihr verbundenen Hebel. Dabei ist zwischen dem zweiten Hebel und einem abgedichtet gelagerten Stößel, der in an sich bekannter Weise die Steuerbewegung in das gasführende Gehäuse mittels Hubbewegung überträgt, ein Schubstangenelement angeordnet, wodurch die Drehbewegung wieder in eine Hubbewegung zur Steuerung des Gasdurchlasses umgewandelt wird.According to the invention the problem is solved in that in the water-carrying housing the control movement of the membrane is transmitted to a lever, the The fulcrum is a tightly connected, sealed bearing and is connected to this lever Outside of the water-bearing housing forms the leading shaft. Thus the Stroke movement of the first lever by means of the shaft as a rotational movement to the outside transfer. The shaft also forms the fulcrum for a second one also firmly connected levers. It is between the second lever and a sealed plunger, which in a manner known per se Control movement in the gas-carrying housing by means of stroke movement transmits Push rod element arranged, whereby the rotary movement back into a Stroke movement to control the gas passage is converted.

Durch die Umwandlung der Hubbewegung der Membran in eine Drehbewegung der Welle wird erreicht, daß das zur Abdichtung benötigte Dichtelement, üblicherweise ein 0-Ring, die Welle immer an der gleichen Stelle abdichtet. Eine axiale Bewegung tritt im Dichtbereich nicht mehr auf. Somit entfällt der bisher aufgetretene Transport von Wasserteilchen aus dem wasserführenden Raum und die damit verbundenen negativen Folgen. Selbst wenn ein Leckfluß trotz der zwischen dem wasserführenden Gehäuse und der Welle befindlichen Dichtung auftreten sollte und sich dadurch auf dem Außenende der Welle Kalkablagerungen bilden, sind diese ohne Einfluß auf die Lagerreibung und das Regelverhalten. Als weitere Vorteil wird erreicht, daß der bei dem beschriebenen Stand der Technik vorhandene Einfluß des Wasserdruckes auf die Gasdurchflußmenge; Ursache dafür ist die auf den Querschnitt des Stößels wirkende Kraftkomponente des Wasserdruckes; bei der erfindungsgemäßen Lösung entfällt. Durch das Schubstangenelement ist gleichzeitig am Übergang zwischen dem ersten Teil und dem zweiten Teil der Welle eine Justierstelle geschaffen.By converting the stroke movement of the membrane into a rotary movement the shaft is achieved that the sealing element required for sealing, usually a 0-ring, the shaft always seals in the same place. An axial Movement no longer occurs in the sealing area. This means that the one that has occurred so far is no longer required Transport of water particles from the water-carrying space and the so associated negative consequences. Even if there is a leakage flow despite that between the water-bearing housing and the shaft seal should occur and limescale build up on the outer end of the shaft these have no influence on the bearing friction and the control behavior. Another advantage it is achieved that the existing in the described prior art Influence of water pressure on the gas flow rate; The reason for this is the on the cross section of the plunger force component of the water pressure; at the solution according to the invention is omitted. Through the push rod element at the same time at the transition between the first part and the second part of the Wave created an adjustment point.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des Gegenstandes des Hauptanspruches möglich.The measures listed in the subclaims are advantageous Developments of the subject of the main claim possible.

So ist die erfindungsgemaße Armatur vorteilhafterweise so ausgeführt, daß der zweite Hebel außerhalb des wasserführenden Gehäuses einstückig mit der Welle verbunden ist. Eine weitere vorteilhafte Ausführung besteht darin, daß die Welle abgedichtet gelagert in den Innenraum des gasführenden Gehäuses führt, in dem der zweite Hebel angeordnet ist, so daß die Übertragung der Steuerbewegung von der Außenseite in das gasführende Gehäuse ebenfalls nicht mehr axial erfolgt. Günstigerweise ist die Welle dann zweigeteilt ausgeführt, wobei ein erster Teil der Welle aus dem Innenraum des wasserführenden Gehäuses zur Außenseite führt, wohingegen ein zweiter Teil der Welle aus dem Innenraum des gasführenden Gehäuses zur Außenseite führtSo the fitting according to the invention is advantageously carried out so that the second lever outside the water-bearing housing in one piece with the shaft connected is. Another advantageous embodiment is that the shaft sealed in the interior of the gas-carrying housing leads in the the second lever is arranged so that the transmission of the control movement of the outside in the gas-carrying housing also no longer takes place axially. The shaft is then advantageously designed in two parts, a first part of the Shaft leads from the interior of the water-carrying housing to the outside, whereas a second part of the shaft from the interior of the gas-carrying housing leads to the outside

AusführungsbeispielEmbodiment

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden näher beschrieben. Es zeigen:

Fig. 1
eine Teilansicht einer erfindungsgemäßen Armatur für einen gasbeheizten Durchlauf-Wassererhitzer bei geschlossenem Gasmengensteuerventil
Fig. 2
eine Teilansicht einer erfindungsgemäßen Armatur für einen gasbeheizten Durchlauf-Wassererhitzer bei geöffnetem Gasmengensteuerventil
Fig. 3
einen Schnitt A - A aus Figur 1
An embodiment of the invention is shown in the drawings and will be described in more detail below. Show it:
Fig. 1
a partial view of a fitting according to the invention for a gas-fired instantaneous water heater with the gas quantity control valve closed
Fig. 2
a partial view of a fitting according to the invention for a gas-fired instantaneous water heater with the gas quantity control valve open
Fig. 3
a section A - A of Figure 1

Die in der Figur 1 teilweise dargestellte Armatur für einen gasbeheizten Durchlauf-Wassererhitzer bei geschlossenem Gasmengensteuerventil 11 und in der Figur 2 teilweise dargestellte Armatur für einen gasbeheizten Durchlauf-Wassererhitzer bei geöffnetem Gasmengensteuerventil 11 weist ein gasführendes Gehäuse 1 und ein wasserführendes Gehäuse 2 auf.The fitting partially shown in Figure 1 for a gas-heated Continuous-flow water heater with closed gas quantity control valve 11 and Fitting partially shown in FIG. 2 for a gas-fired instantaneous water heater when the gas quantity control valve 11 is open, it has a gas-carrying one Housing 1 and a water-bearing housing 2.

Das wasserführende Gehäuse 2 enthält neben anderen, dem Fachmann bekannten und daher hier, weil nicht erfindungswesentlich, nicht weiter erläuterten Bauteilen, einen Strömungsschalter 21, der als Wassermangelsicherung dient. Dieser Strömungsschalter 21 weist eine Hochdruckkammer 22 und eine Niederdruckkammer 23 auf, die beide durch eine Membran 24 voneinander getrennt sind. Die Membran 24 stützt sich an einem Membranteller 25 ab. Die Niederdruckkammer 23 wird durch einen Deckel 26 verschlossen, der einerseits mit dem wasserführenden Gehäuse 2 verbunden ist, und andererseits teilweise durch das gasführende Gehäuse 1 eingekammert ist. Im Deckel 26 stützt sich eine Druckfeder 27 ab, die mit ihrem anderen Ende am Membranteller 25 anliegt.The water-carrying housing 2 contains, among others, known to those skilled in the art and therefore not explained further here, because it is not essential to the invention Components, a flow switch 21, which acts as a low water indicator serves. This flow switch 21 has a high-pressure chamber 22 and a low pressure chamber 23, both through a membrane 24 are separated from each other. The membrane 24 is supported on a membrane plate 25 from. The low pressure chamber 23 is closed by a cover 26, which is connected on the one hand to the water-carrying housing 2, and on the other hand partially chambered by the gas-carrying housing 1 is. In the cover 26, a compression spring 27 is supported, which with its other End rests on the diaphragm plate 25.

Auf dem Membranteller 25 stützt sich mit einem Ende ein gekröpfter Hebel 3 ab, der mit seinem anderen Ende fest mit einer im Deckel 26 abgedichtet aber drehbar gelagerten Welle 4 verbunden ist. Dabei bildet die Welle 4 gleichzeitig einen Drehpunkt für einen zweiten Hebel 5, wobei es vorteilhaft ist, wenn Welle 4 und Hebel 5 einstückig in Form eines Bügels 6 ausgeführt sind (Fig. 3).One end of a cranked lever is supported on the diaphragm plate 25 3 from, the other end tightly sealed with one in the cover 26 but rotatably mounted shaft 4 is connected. The shaft 4 forms at the same time a fulcrum for a second lever 5, it being advantageous is when shaft 4 and lever 5 are made in one piece in the form of a bracket 6 are (Fig. 3).

Das gasführende Gehäuse 1 enthält neben anderen, dem Fachmann ebenfalls bekannten und daher hier, weil nicht erfindungswesentlich, ebenfalls nicht weiter erläuterten Bauteilen, ein Gasmengensteuerventil 11. Das Gasmengensteuerventil 11 befmdet sich in einem topfförmigen Raum 13, in dessem Boden 14 sich eine ansonsten gasdichte Führung 15 für einen in axialer Richtung des topfförmigen Raumes 13 längsbeweglichen Stößel 12, der mit dem Ventilteller 111 des Gasmengensteuerventils 11 verbunden ist, befindet. Der Ventilteller 111 wird durch eine Rückstellfeder 112 in Schließrichtung belastet, die sich mit ihrem anderen Ende am Boden 14 abstützt. An seinem dem Gasmengensteuerventil 11 abgewandten Ende, das in einen mit der Umgebung in Verbindung stehenden Raum 16 des ansonsten gasführenden Gehäuses 1 hineinragt, besitzt der Stößel 12 eine Einkerbung 121, die zur Befestigung eines Schubstangenelementes 17 dient.The gas-carrying housing 1 contains, among others, also to the person skilled in the art known and therefore not here, because not essential to the invention further explained components, a gas quantity control valve 11. The gas quantity control valve 11 is located in a pot-shaped space 13, in the latter Bottom 14 is an otherwise gastight guide 15 for one in the axial Direction of the cup-shaped space 13 longitudinally movable plunger 12 with the valve plate 111 of the gas quantity control valve 11 is connected. The valve disk 111 is closed by a return spring 112 loaded, which is supported with its other end on the floor 14. On his the gas flow control valve 11 facing away from the end with the Surrounding space 16 of the otherwise gas-carrying Protrudes housing 1, the plunger 12 has a notch 121, which for Attachment of a push rod element 17 is used.

Das Schubstangenelement 17 ist in diesem Ausführungsbeispiel ein U-förmig ausgebildetes Formteil. Im die beiden Schenkel verbindenden Teil befindet sich eine beispielsweise mit Gewinde versehene Bohrung 171, die zur Aufnahme eines in Längsrichtung verstellbaren Elementes, beispielsweise einer Schraube 174 dient. Desweiteren ist einer der beiden Schenkel verlängert ausgeführt und an seinem Ende 172 abgebogen. Im abgebogenen Ende 172 befindet sich in axialer Verlängerung der Bohrung 174 eine Ausnehmung 173, die zur Aufnahme der Einkerbung 121 des Stößels 12 dient.The push rod element 17 is U-shaped in this embodiment trained molded part. In the part connecting the two legs there is, for example, a threaded bore 171 which for receiving a longitudinally adjustable element, for example a screw 174 is used. Furthermore, one of the two legs is extended executed and bent at its end 172. In the bent At the end 172 there is a recess in the axial extension of the bore 174 173, which serves to receive the notch 121 of the plunger 12.

In der durch die beiden Schenkel gebildeten Aufnahme ist der bereits weiter oben beschriebene Hebel 5; in diesem Ausführungsbeispiel ein Teil des Bügels 6; gelagert, der sich unter den wirkenden Kräften der Rückstellfeder 112 und der Druckfeder 27 an der Schraube 174 abstützt.It is already wider in the receptacle formed by the two legs lever 5 described above; in this embodiment part of the bracket 6; stored, which is under the acting forces of the return spring 112 and the compression spring 27 is supported on the screw 174.

Die Funktion der in den Figuren 1 bis 3 dargestellten erfindungsgemäßen Armatur für einen Durchlauf-Wassererhitzer wird nachfolgend beschrieben:The function of the invention shown in Figures 1 to 3 Fitting for a once-through water heater is described below:

Mit Wasserentnahme entsteht durch die Saugwirkung der im wasserführenden Gehäuse 2 befindlichen, nicht dargestellten Venturidüse zwischen der Hochdruckkammer 22 und der Niederdruckkammer 23 ein Differenzdruck, der eine Hubbewegung der Membran 24 zur Folge hat. Diese Hubbewegung wird über den Membranteller 25 auf den Hebel 3 übertragen. Auf Grund der festen Verbindung zwischen dem Hebel 3 und der Welle 4 wird diese Hubbewegung in eine Drehbewegung umgewandelt und gleichzeitig aus dem wasserführenden Gehäuse 2 herausgeführt. Die Drehbewegung der Welle 4 wird weiter auf den Hebel 5 übertragen und dabei gleichzeitig, da die Welle 4 auch Drehpunkt für den Hebel 5 ist, wieder in eine Hubbewegung umgewandelt. Mittels des Schubstangenelementes 17 wirkt diese Hubbewegung auf den Stößel 12, wodurch das bis dahin geschlossene Gasmengensteuerventil 11 (Fig. 1) geöffnet wird.With water withdrawal, the suction effect of water in the water Housing 2 located, not shown Venturi nozzle between the High pressure chamber 22 and the low pressure chamber 23 a differential pressure, which results in a lifting movement of the membrane 24. This lifting movement is transferred to the lever 3 via the diaphragm plate 25. Due to the fixed connection between the lever 3 and the shaft 4, this stroke movement converted into a rotary motion and at the same time from the water-bearing housing 2 led out. The rotation of the shaft 4 will continue to be transferred to lever 5 and at the same time because the shaft 4 is also the fulcrum for the lever 5, again converted into a lifting movement. This lifting movement acts by means of the push rod element 17 on the plunger 12, whereby the gas quantity control valve, which was closed until then 11 (Fig. 1) is opened.

In Abhängigkeit von der Menge des benötigten Wassers, und der sich dadurch auf Grund der unterschiedlichen Saugwirkung der Venturidüse einstellenden Größe des Differenzdruckes wird auch das Gasmengensteuerventil 11 mehr oder weniger geöffnet. So ist in Fig. 2 zwar die maximale Öffnung des Gasmengensteuerventils 11 gezeigt, aber es versteht sich, daß auch Zwischenstellungen möglich sind.Depending on the amount of water required and the result due to the different suction effect of the Venturi nozzle The gas quantity control valve 11 also becomes the size of the differential pressure more or less open. So in Fig. 2 is the maximum opening of the Gas flow control valve 11 shown, but it is understood that intermediate positions possible are.

Um auf Grund der Fertigungstoleranzen eine Zuordnung zwischen dem Hub der Membran 24 und dem Hub des Gasmengensteuerventils 11 vornehmen zu können, erweist es sich als vorteilhaft ein Justageelement vorzusehen. Diese Aufgabe übernimmt in diesem Ausführungsbeispiel die Schraube 174, deren Einschraubtiefe wie gewünscht durch die Öffnung 175 variiert werden kann.To make an assignment between the stroke based on the manufacturing tolerances the membrane 24 and the stroke of the gas quantity control valve 11 to be able to, it proves to be advantageous to provide an adjustment element. In this exemplary embodiment, the screw 174 takes over this task, whose screw-in depth can be varied as desired through the opening 175 can.

Die erfindungsgemäße Armatur ist selbstredend nicht auf das dargestellte Ausführungsbeispiel beschränkt. Vielmehr sind Änderungen und Abwandlungen möglich, ohne den Rahmen der Erfindung zu verlassen. So kann beispielsweise die Welle 4 abgedichtet gelagert in den Innenraum des gasführenden Gehäuses 1 geführt werden, wobei es sich versteht, daß dann der Hebel 5 im Innenraum des gasführenden Gehäuses 1 angeordnet sein muß. Weiterhin kann die Welle 4 zweigeteilt ausgeführt sein, wobei ein erster Teil der Welle 4 aus dem Innenraum des wasserführenden Gehäuses 2 zur Außenseite führt, wohingegen ein zweiter Teil der Welle 4 aus dem Innenraum des gasführenden Gehäuses 1 zur Außenseite führt. Eine gewünschte Möglichkeit zur Justierung befindet sich dann günstigerweise zwischen der Durchführung aus dem wasserführenden Gehäuse 2 und der Durchführung aus dem gasführenden Gehäuse 1. The valve according to the invention is of course not on the illustrated Embodiment limited. Rather, there are changes and modifications possible without leaving the scope of the invention. For example the shaft 4 is sealed in the interior of the gas-carrying Housing 1 are performed, it being understood that then the lever 5 must be arranged in the interior of the gas-carrying housing 1. Furthermore, the shaft 4 can be designed in two parts, a first part the shaft 4 from the interior of the water-bearing housing 2 to the outside leads, whereas a second part of the shaft 4 from the interior of the gas-carrying housing 1 leads to the outside. A desired option for adjustment is then conveniently between the Implementation from the water-carrying housing 2 and the implementation from the gas-carrying housing 1.

Aufstellung der BezugszeichenList of reference numbers

11
gasführendes Gehäusegas-carrying housing
1111
GasmengensteuerventilGas flow control valve
111111
VentiltellerValve plate
112112
RückstellfederReturn spring
1212th
StößelPestle
121121
Einkerbungnotch
1313
topfförmiger Raumpot-shaped room
1414
Bodenground
1515
gasdichte Führunggastight guidance
1616
Raumroom
1717th
SchubstangenelementPush rod element
171171
Bohrungdrilling
172172
EndeThe End
173173
AusnehmungRecess
174174
Schraubescrew
175175
Öffnungopening
22nd
wasserführendes Gehäusewater-bearing housing
2121
StrömungsschalterFlow switch
2222
HochdruckkammerHigh pressure chamber
2323
NiederdruckkammerLow pressure chamber
2424th
Membranmembrane
2525th
MembrantellerMembrane plate
2626
Deckelcover
2727
DruckfederCompression spring
33rd
erster Hebelfirst lever
44th
Wellewave
55
zweiter Hebelsecond lever
66
Bügelhanger

Claims (5)

  1. Fitting, especially for a continuous flow water heater, to control a gas outlet depending on water flow, with a gas control housing (1), a water control housing (2) and a mechanical transmission, which transmits a control motion, irrespective of water flow and initiated preferably by a Venturi tube located in water control housing (2) and a membrane (24), firstly from the interior of water control housing (2) to its exterior and from there to a gas volume control valve in gas control housing (1), characterized by this means in that the control movement in water control housing (1) is transmitted to a lever (3), whose centre of rotation forms a shaft (4), rigidly connected to this lever (3) and whose pivot is sealed, leading to the exterior of the water control housing (2), which thus transmits the control motion externally as a rotary motion, and that shaft (4) forms the centre of rotation for a second lever (5) which is likewise rigidly connected to it, and that the control motion in gas control housing (1) is transmitted by the known method via a rod (12), whose pivot is sealed, by means of a stroke motion whereby a connecting rod element (17) is arranged between second lever (5) and rod (12), whereby the rotary motion is again converted into a stroke motion to control the gas outlet.
  2. Fitting, especially for a continuous flow water heater, according to patent claim 1, characterized by this means in that the second lever (5) is connected in one piece with shaft (4) external to water control housing (2).
  3. Fitting, especially for a continuous flow water heater, according to patent claim 1, characterized by this means in that shaft (4), whose pivot is sealed, leads to the interior of gas control housing (1) in which the second lever (5) is arranged.
  4. Fitting, especially for a continuous flow water heater, according to patent claim 3, characterized by this means in that shaft (4) is made in two parts, whereby a first part of shaft (4) leads from the interior of water control housing (2) to its exterior whereas a second part of shaft (4) leads from the interior of gas control housing (1) to its exterior.
  5. Fitting, especially for a continuous flow water heater, according to patent claims 1 or 4, characterized by this means in that the mechanical transmission between the duct from water control housing (2) and the duct from gas control housing (1) is adjustable.
EP95923262A 1994-07-16 1995-06-08 Flow control, specially for an instantaneous water heater Expired - Lifetime EP0834043B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4425200 1994-07-16
DE4425200A DE4425200A1 (en) 1994-07-16 1994-07-16 Faucet, especially for a once-through water heater
PCT/EP1995/002208 WO1996002795A1 (en) 1994-07-16 1995-06-08 Flow control, specially for an instantaneous water heater

Publications (2)

Publication Number Publication Date
EP0834043A1 EP0834043A1 (en) 1998-04-08
EP0834043B1 true EP0834043B1 (en) 2000-02-09

Family

ID=6523362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95923262A Expired - Lifetime EP0834043B1 (en) 1994-07-16 1995-06-08 Flow control, specially for an instantaneous water heater

Country Status (12)

Country Link
US (1) US5875807A (en)
EP (1) EP0834043B1 (en)
CA (1) CA2194584C (en)
CZ (1) CZ289761B6 (en)
DE (2) DE4425200A1 (en)
ES (1) ES2144616T3 (en)
HU (1) HU219964B (en)
IL (1) IL114552A0 (en)
PL (1) PL177671B1 (en)
PT (1) PT834043E (en)
WO (1) WO1996002795A1 (en)
ZA (1) ZA955734B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7465399B1 (en) * 2005-02-28 2008-12-16 Hoeptner Iii Herbert W Filtered and unfiltered water ducting in sink fitting
US7353834B2 (en) * 2005-08-25 2008-04-08 Dresser, Inc. Variable rate pressure regulator
US8596606B2 (en) * 2006-09-22 2013-12-03 Jorge Maercovich Automate fluid flow control system
US20170082321A1 (en) * 2012-02-28 2017-03-23 Mertik Maxitrol Gmbh & Co., Kg Flow control for a continuous-flow water heater

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1065595B (en) *
US2126378A (en) * 1933-02-08 1938-08-09 Junkers & Co Controller for gas-heated apparatus
DE647449C (en) * 1933-02-09 1937-07-05 Junkers & Co Device for the automatic regulation of the gas supply to gas-heated devices
US2258590A (en) * 1938-09-06 1941-10-14 Junkers & Co Gas valve for liquid heaters
GB538650A (en) * 1940-02-08 1941-08-12 Leonard Eugene Cowey Improvements in and relating to fluid actuated valves and valve fittings
FR882482A (en) * 1941-04-01 1943-06-04 Device for automatic control of the gas supply for water heaters, bath heaters and the like
FR1010002A (en) * 1948-07-21 1952-06-06 Chaffoteaux Et Maury Reunis Et Improvements in fluid sealing devices
US3327761A (en) * 1964-10-19 1967-06-27 Technical Marketing Associates Fuel safety shut-off apparatus
DE1908408A1 (en) * 1969-02-20 1970-09-10 Junkers & Co Device for controlling the gas supply to a burner of a gas-heated circulating water heater
US4200258A (en) * 1977-10-07 1980-04-29 Ranco Incorporated Butterfly valve
US4299373A (en) * 1980-01-28 1981-11-10 Ranco Incorporated Fluid flow control valve
US4457486A (en) * 1982-04-29 1984-07-03 Allegheny Valve Company Discharge control means for a storage tank for liquid
JPH0249478Y2 (en) * 1985-06-19 1990-12-26
DE4316779A1 (en) * 1992-06-24 1994-11-24 Mertik Maxitrol Gmbh & Co Kg Gas quantity control, especially for a tap of a once-through water heater

Also Published As

Publication number Publication date
US5875807A (en) 1999-03-02
PT834043E (en) 2000-07-31
ZA955734B (en) 1996-05-29
DE4425200A1 (en) 1996-01-18
HUT77508A (en) 1998-05-28
CZ289761B6 (en) 2002-04-17
CA2194584C (en) 2007-05-15
ES2144616T3 (en) 2000-06-16
CA2194584A1 (en) 1996-02-01
HU219964B (en) 2001-10-28
DE59507800D1 (en) 2000-03-16
PL318112A1 (en) 1997-05-12
PL177671B1 (en) 1999-12-31
IL114552A0 (en) 1995-11-27
WO1996002795A1 (en) 1996-02-01
EP0834043A1 (en) 1998-04-08
CZ8097A3 (en) 1997-05-14

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