EP0429450B1 - Gas-fired instantaneous water heater - Google Patents

Gas-fired instantaneous water heater Download PDF

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Publication number
EP0429450B1
EP0429450B1 EP89903459A EP89903459A EP0429450B1 EP 0429450 B1 EP0429450 B1 EP 0429450B1 EP 89903459 A EP89903459 A EP 89903459A EP 89903459 A EP89903459 A EP 89903459A EP 0429450 B1 EP0429450 B1 EP 0429450B1
Authority
EP
European Patent Office
Prior art keywords
valve
water
flow switch
control valve
venturi
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
EP89903459A
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German (de)
French (fr)
Other versions
EP0429450A1 (en
Inventor
Josef Schmid
Christian Welte
Hans Hoeness
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0429450A1 publication Critical patent/EP0429450A1/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/18—Groups of two or more valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/20—Membrane valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/24—Valve details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/20—Controlling one or more bypass conduits

Definitions

  • the invention is based on a gas-fired once-through water heater according to the two independent claims.
  • the actuator of the flow switch acts on a control valve in a bypass channel to the venturi, which is arranged in addition to the bypass channel containing the manual control valve.
  • the control valve ensures that the maximum temperature increase matched to a specified nominal output and a specified nominal water quantity of the device is not exceeded even if the nozzle valve is only opened to such an extent that the water throughput remains below the nominal water quantity.
  • the control valve only fulfills this function of keeping the temperature constant when the manual control valve in the second bypass line is closed and the device delivers hot water with the greatest possible temperature increase.
  • the manual control valve is opened more or less to preselect a lower outlet temperature of the water, the control valve is then no longer able to maintain the preselected lower outlet temperature if the water flow through the device is also throttled by only partially opening the nozzle.
  • water heaters of the generic type are known (DE-B-1 171 138), in which the bypass channel leading to the venturi via the manual control valve is additionally monitored by a control valve influenced by the flow switch, which only releases the bypass channel when the actuator of the flow switch is one of the full energy supply has covered the corresponding stroke.
  • This arrangement is intended to ensure that the setting of the manual control valve has no influence on the minimum water flow necessary for the flow switch to respond.
  • the arrangement according to the invention with the features of the independent claims has the advantage that the water outlet temperature not only maintains the temperature value preselected or set via the manual control valve at least approximately when tapping hot water, but also when tapping water of lower temperature if the water throughput exceeds Nozzle is limited to a value that lies between the minimum amount of water that triggers the flow switch and the maximum amount of water corresponding to the respective temperature selection.
  • the control element provided for constant hot water temperature can be a control pin protruding into the narrowest cross section of the Venturi.
  • the venturi is bridged by two bypass channels, one of which via the manual control valve and the other control valve for hot water temperature constancy influenced by the flow switch, whereas the other bypass channel contains a control valve for hot water temperature constancy influenced by the flow switch and the movable valve members of the control valves are firmly connected to the piston member.
  • the invention provides that the movable valve member of the control valve for constant hot water temperature has a throttle pin projecting axially into the valve opening of the control valve, which tapers towards its free end and carries an enlarged throttle collar there .
  • control valve is matched to the gas valve in such a way that, after a linear part of the stroke characteristic of the flow switch, the gas supply no longer increases or does not increase above a predetermined maximum value.
  • valve opening of at least one control valve is formed on a socket inserted into the bypass duct, the position of which relative to the movable valve member can be set within predetermined limits.
  • FIG. 1 shows a schematic overall representation of a gas-heated device for preparing hot or hot process water with a so-called water fitting in section
  • FIG. 2 shows a partial section through the water fitting according to FIG. 1 on an enlarged scale compared to FIG. 1
  • FIG. 3 shows a variant of a functional part of the water fitting
  • FIG 4 shows a functional diagram of the device according to FIGS. 1-3.
  • the device has a water flow line 10, which leads from a water inlet 12 via a water fitting provided as a whole with the reference number 14 and a heat exchanger 16 to a water outlet 18 or a nozzle 20.
  • a rust-shaped gas burner 22 Arranged beneath the heat exchanger 16 in a combustion shaft (not shown) is a rust-shaped gas burner 22 which is fed from a gas line 24 which is provided with a gas valve 26.
  • This has a closing member 28, which is pressed by a closing spring 30 against a valve seat at the valve opening and is provided with a conically tapering control shoulder 32 projecting into it.
  • the control approach 32 is designed so that there is a linear dependence of the gas throughput on the stroke of the closing member 28.
  • the water fitting 14 contains a flow switch 34 serving as a low water protection, which has a high pressure chamber 36 and a low pressure chamber 38, which are separated from each other by a piston member 40.
  • a flow switch 34 serving as a low water protection, which has a high pressure chamber 36 and a low pressure chamber 38, which are separated from each other by a piston member 40.
  • This consists of a membrane 42 ( Figure 2) and a rigid support plate 44 to which the membrane 42 is held by means of molded pins 46.
  • the piston member 40 is also fixedly connected to a valve lifter 48, which seals is led out of the low pressure chamber 38 and together with the piston member 40 forms a hydraulic actuator for the gas valve 26.
  • the water inlet 12 is connected to a chamber 52 in the water fitting 34 which receives a water quantity regulator or limiter 50 and from which a control passage 54 leads into the high pressure chamber 36.
  • the water quantity controller 50 which is shown in the control position in FIG. 2, has a control piston 56, which is pressed upwards by a control spring 58 against the piston member 40.
  • the control piston 56 has a control cone 60, which cooperates with a control edge 62 at the control passage 54 to control the flow of water into the high-pressure chamber 36.
  • a sleeve-shaped extension 63 which is slidably mounted in a closure part 64 screwed into the valve housing and in its central bore 66 accommodates the control spring 58, which is supported at the bottom on the closure part 64.
  • the bore 66 is connected via channels 67, 68 in the control piston 56 to the part of the chamber 52 above the control cone 60.
  • a channel 70 leads from the high-pressure chamber 36 to an outlet 72 of the water fitting, in which a venturi 74 is installed.
  • the narrowest point of the Venturi 74 is connected to the low-pressure chamber 38 via a narrow bore 76.
  • From the high-pressure chamber 36 two bypass channels 78 and 80 branching off the venturi 74 also branch off, both of which open into the channel 70 downstream of the venturi 74.
  • Both bypass channels 78, 80 are each provided with a control valve 82 and 84, the structure and function of which is described in more detail below.
  • a manual control valve 86 is also installed, which has the function of a temperature selector for the tap water in a known manner.
  • the control valve 82 has a throttle pin 90 projecting coaxially into the mouth region 88 of the bypass channel 78, which is firmly connected to the carrier plate 44 of the piston member 40.
  • the throttle pin 90 has a conically tapering central section 92, the diameter-larger starting area of which, when the piston member 40 is at rest, projects into a valve opening 94 of the control valve 82.
  • the throttle pin 90 is provided with a throttle collar 96 which is enlarged in diameter and which is located in the valve end 94 in the stroke end position of the piston member 40 in the valve opening 94 shown in the right in FIG.
  • the valve opening 94 is formed on a bushing 98 which is slidably mounted in the mouth region 88 of the bypass channel 78 and whose axial position can be set within predetermined limits by an adjusting device 100.
  • the adjusting device 100 has an actuating pin 104 which is rotatably mounted in the valve housing and is provided with a screw head 102 and which carries an eccentric bolt 106 at the inner end which engages in a recess on the circumference of the bushing 98.
  • the screw head 102 is provided with a transverse slot 108 for the insertion of a tool for turning the setting pin 104, the bearing points of which are sealed by O-rings 110 and 112 and which is fixed in the set position by a clamping screw 113 pressing against the screw head 102.
  • the control valve 84 of the bypass channel 80 leading via the manual control valve 86 also has a conically tapering throttle pin 114 fastened to the piston member 40, which is arranged coaxially with a mouth region 116 of the bypass channel 80 and one Passage cross section controls according to the stroke position of the piston member 40.
  • the valve opening of the control valve 84 can be arranged analogously to the control valve 82 on an axially adjustable bushing in the mouth region 116 of the bypass channel 80.
  • the throttle pin according to FIG. 3 can also be formed by a shape 114a in the carrier plate 44a.
  • the water quantity regulator 50 can be removed by loosening the closure part 64 to the outside.
  • a thin-walled flanged collar 120 is provided on it, which is initially parallel to the control axis and, after the sleeve-shaped extension 63 of the control piston 56 has been inserted, is folded inwards.
  • a pressure relief valve 122 is also installed in the closure part 64, the closing force of which can be adjusted from the outside by turning a screw plug 124 supporting the closing spring.
  • the actuating stroke h of the flow switch 34 and the temperature increase Delta t are plotted against the passage quantity Q of the water related to the time unit.
  • the manual control valve 86 is closed (hot water preparation)
  • the flow switch 34 responds at a water flow of approximately 1.8 l / min, lifting the closing member 28 of the gas valve 26 from its seat.
  • the linear stroke h increases linearly according to the line a until the flow rate Q has approximately reached the desired value of about 7.5 l / min set by the water volume controller 50.
  • the opening stroke of the gas valve closing element 28 also increases linearly with the flow rate Q.
  • the control approach 32 on the closing member 28 ensures that the amount of gas supplied to the burner 22 increases linearly with the flow rate Q of the water and vice versa.
  • the temperature of the drawn-off water from the minimum quantity required to open the gas valve 26 of approximately 1.8 l / min to the regulating quantity of approximately 7.5 l / min is approximately the prescribed value of the temperature increase of experiences about 50 ° K, for example.
  • the temperature profile of the drawn-off hot water is represented by line b, according to which an outlet temperature of approx. 60 ° C results when the water inlet temperature is assumed to be 10 ° C.
  • the actual characteristic curve of the actuating stroke h will lie in a spreading range at a preset device, which is indicated in the functional diagram by the two limit characteristic curves a 1 and a 2. Accordingly, the actual course of the temperature increase becomes delta t lie above the flow rate Q in a range which is indicated by the two limit characteristics b1 and b2.
  • the characteristic curves can be brought into the center of the scattering ranges by corresponding axial adjustment of the bushing 98 of the control valve 82, as shown in the functional diagram, where the temperature curve b most approximated to a straight line results.
  • the throttle collar 96 on the throttle pin 90 enters the valve opening 94, after which the disproportionate effect of the Venturi 74 comes into its own and the piston member 40 of the flow switch 34 already has a minimal further effect Increasing the water throughput reaches the stroke position corresponding to the control position of the water quantity regulator 50.
  • the arrangement is such that the gas valve 26 is already fully open when the throttle collar 96 takes effect, so that the full output of the burner 22 is achieved with certainty.
  • the user wants to tap water with a lower outlet temperature than 60 ° C or a lower temperature increase than 50 ° K, he opens the bypass channel 80 accordingly by means of the manual control valve 86.
  • the conditions are shown in the functional diagram when the manual control valve 86 is fully open. It is initially assumed that the bypass channel 80, as in the prior art, is only monitored by the manual control valve 86 and the control valve 84 provided according to the invention is missing in the bypass channel 80. Then the flow switch 34 would only at a flow rate of about 6 l / min. respond and open the gas valve 26. Thereafter, the actuating stroke h would increase with a further increase in the flow rate Q according to the characteristic curve d and a course of the temperature increase Delta t would result according to the characteristic curve e.
  • the characteristic curve e makes it clear that when dispensing hot water, the outlet temperature of which depends to a considerable extent on the flow rate based on the time unit, if the manual control valve 86 is not assigned any adjustment stroke-dependent correction means.
  • the two control valves 82 and 84 are so matched to one another and to the gas valve 26 or its closing member 28 that practically from the minimum flow rate of approx. 3.7 l / min up to the maximum flow rate of approx. 11 limited by the water quantity controller 50 l / min the gas supply to the water throughput increases approximately proportionally and vice versa, so that, according to characteristic curve i, the temperature increase delta t is approximately constant.

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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)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Multiple-Way Valves (AREA)
  • Fluid-Driven Valves (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

A gas-fired instantaneous water heater is so designed that even when the water drawn is not heated to the maximum temperature (warm water), the pre-selected delivery temperature is independent of the quantity delivered per unit time. To this end, a control valve (84) acted upon by the actuator (40, 48) of the flow switch (34) is arranged in the bypass channel (80) in series with the manual control valve (86) for selecting the temperature. When the tapping valve (20) is turned on, the control valve (84) first throttles and then gradually opens the bypass channel (80). The preferred field of application is gas-fired instantaneous water heaters for supplying hot and warm water for domestic use.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem gasbeheizten Durchlauf-Wassererhitzer nach der Gattung beiden unabhängigen Ansprüche. Bei den bekannten Wassererhitzern dieser Gattung (DE-B2 25 31 485) wirkt das Stellglied des Strömungsschalters auf ein Steuerventil in einem Bypaßkanal zum Venturi ein, welcher zusätzlich zu dem das Handstellventil enthaltenden Bypaßkanal angeordnet ist. Das Steuerventil sorgt dafür, daß die auf eine vorgegebene Nennleistung und eine vorgegebene Nennwassermenge des Gerätes abgestimmte maximale Temperaturerhöhung auch dann nicht überschritten wird, wenn das Zapfventil nur soweit geöffnet ist, daß der Wasserdurchsatz unter der Nennwassermenge bleibt. Diese Funktion der Temperatur-Konstanthaltung erfüllt das Steuerventil jedoch nur, wenn das Handstellventil in der zweiten Bypaßleitung geschlossen ist und das Gerät Heißwasser mit der größtmöglichen Temperaturerhöhung liefert. Wenn das Handstellventil jedoch mehr oder weniger weit geöffnet wird, um eine geringere Auslauftemperatur des Wassers vorzuwählen, vermag das Steuerventil die vorgewählte geringere Auslauftemperatur dann nicht mehr einzuhalten, wenn durch nur teilweises Öffnen des Zapfventils auch der Wasserdurchsatz durch das Gerät gedrosselt ist.The invention is based on a gas-fired once-through water heater according to the two independent claims. In the known water heaters of this type (DE-B2 25 31 485), the actuator of the flow switch acts on a control valve in a bypass channel to the venturi, which is arranged in addition to the bypass channel containing the manual control valve. The control valve ensures that the maximum temperature increase matched to a specified nominal output and a specified nominal water quantity of the device is not exceeded even if the nozzle valve is only opened to such an extent that the water throughput remains below the nominal water quantity. The control valve only fulfills this function of keeping the temperature constant when the manual control valve in the second bypass line is closed and the device delivers hot water with the greatest possible temperature increase. However, if the manual control valve is opened more or less to preselect a lower outlet temperature of the water, the control valve is then no longer able to maintain the preselected lower outlet temperature if the water flow through the device is also throttled by only partially opening the nozzle.

Ferner sind Wassererhitzer der gattungsmäßigen Art bekannt (DE-B-1 171 138), bei denen der über das Handstellventil führende Bypasskanal zum Venturi zusätzlich von einem vom Strömungsschalter beinflußten Steuerventil überwacht ist, welches den Bypasskanal erst freigibt, wenn das Stellglied des Strömungsschalters einen der vollen Energiezufuhr entsprechenden Hub zurückgelegt hat. Mit dieser Anordnung soll sichergestellt werden, daß die Einstellung des Handstellventils keinen Einfluß auf den zum Ansprechen des Strömungsschalters notwendigen Mindestwasserdurchfluß hat.Furthermore, water heaters of the generic type are known (DE-B-1 171 138), in which the bypass channel leading to the venturi via the manual control valve is additionally monitored by a control valve influenced by the flow switch, which only releases the bypass channel when the actuator of the flow switch is one of the full energy supply has covered the corresponding stroke. This arrangement is intended to ensure that the setting of the manual control valve has no influence on the minimum water flow necessary for the flow switch to respond.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Anordnung mit den Merkmalen der unabhängigen Ansprüche hat den Vorteil, daß die Wasserauslauftemperatur nicht nur beim Heißwasserzapfen, sondern auch beim Zapfen von Wasser geringerer Temperatur (Warmwasser) den über das Handstellventil vorgewählten bzw. eingestellten Temperaturwert mindestens annähernd beibehält, wenn der Wasserdurchsatz über das Zapfventil auf einen Wert begrenzt wird, der zwischen der den Strömungsschalter zum Ansprechen bringenden Mindestwassermenge und der der jeweiligen Temperaturwahl entsprechenden Höchstwassermenge liegt.The arrangement according to the invention with the features of the independent claims has the advantage that the water outlet temperature not only maintains the temperature value preselected or set via the manual control valve at least approximately when tapping hot water, but also when tapping water of lower temperature if the water throughput exceeds Nozzle is limited to a value that lies between the minimum amount of water that triggers the flow switch and the maximum amount of water corresponding to the respective temperature selection.

Das für die Heißwasser-Temperaturkonstanz vorgesehene Steuerglied kann beispielsweise gemäß der DE-A1 23 30 486 ein in den engsten Querschnitt des Venturis hineinragender Steuerstift sein. Im Falle der Anordnung eines zur Warmwasser-Temperaturkonstanz dienenden zweiten Steuerventils ist es zur gegenseitigen Abstimmung der Teile jedoch vorteilhaft, wenn das Venturi von zwei Bypasskanälen überbrückt ist, von denen der eine über das Handstellventil und das vom Strömungsschalter beeinflußte Steuerventil für Warmwasser-Temperaturkonstanz führt, wogegen der andere Bypasskanal ein vom Strömungsschalter beeinflußtes Steuerventil für Heißwasser-Temperaturkonstanz enthält und die beweglichen Ventilglieder der Steuerventile fest mit dem Kolbenglied verbunden sind.According to DE-A1 23 30 486, the control element provided for constant hot water temperature can be a control pin protruding into the narrowest cross section of the Venturi. In the case of the arrangement of a second control valve serving to maintain the hot water temperature, however, it is advantageous for the mutual coordination of the parts if the venturi is bridged by two bypass channels, one of which via the manual control valve and the other control valve for hot water temperature constancy influenced by the flow switch, whereas the other bypass channel contains a control valve for hot water temperature constancy influenced by the flow switch and the movable valve members of the control valves are firmly connected to the piston member.

Damit gasseitig die gewünschte Nennleistung sicher erreicht wird, ist erfindungsgemäß vorgesehen, daß das bewegliche Ventilglied des Steuerventils für Heißwasser-Temperaturkonstanz einen axial in die Ventilöffnung des Steuerventils hineinragenden Drosselzapfen hat, der sich zu seinem freien Ende hin verjüngt und dort einen im Durchmesser vergrößerten Drosselbund trägt.So that the desired nominal power is reliably achieved on the gas side, the invention provides that the movable valve member of the control valve for constant hot water temperature has a throttle pin projecting axially into the valve opening of the control valve, which tapers towards its free end and carries an enlarged throttle collar there .

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des Gegenstandes des Hauptanspruchs möglich.The measures listed in the dependent claims allow advantageous developments of the subject matter of the main claim.

Es ist besonders vorteilhaft, wenn das Steuerventil so auf das Gasventil abgestimmt ist, daß nach einem linearen Teil der Hubkennlinie des Strömungsschalters ein die Gaszufuhr nicht mehr bzw. nicht über einen vorgegebenen Maximalwert steigernder Überhub einsetzt.It is particularly advantageous if the control valve is matched to the gas valve in such a way that, after a linear part of the stroke characteristic of the flow switch, the gas supply no longer increases or does not increase above a predetermined maximum value.

Zur weiteren Erleichterung der gegenseitigen Abstimmung der Funktionsteile ist es zweckmäßig, wenn die Ventilöffnung mindestens eines Steuerventils an einer in den Bypasskanal eingesetzten Buchse gebildet ist, deren Lage zum beweglichen Ventilglied in vorgegebenen Grenzen einstellbar ist.To further facilitate the mutual coordination of the functional parts, it is expedient if the valve opening of at least one control valve is formed on a socket inserted into the bypass duct, the position of which relative to the movable valve member can be set within predetermined limits.

Durch die konstruktiven Merkmale der Ansprüche 5 bis 7 ergeben sich einfache und gedrängte Konstruktionen von aus Strömungsschalter, Venturi, Steuerventilen und Handstellventil bestehenden Baueinheiten.The structural features of claims 5 to 7 result in simple and compact constructions of structural units consisting of flow switch, venturi, control valves and manual control valve.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine schematische Gesamtdarstellung eines gasbeheizten Gerätes zur Bereitung heißen bzw. warmen Brauchwassers mit einer sogenannten Wasserarmatur im Schnitt, Figur 2 einen Teilschnitt durch die Wasserarmatur nach Figur 1 in gegenüber Figur 1 vergrößertem Maßstab, Figur 3 eine Variante eines Funktionsteils der Wasserarmatur und Figur 4 ein Funktionsschaubild des Gerätes nach den Figuren 1 - 3.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. It 1 shows a schematic overall representation of a gas-heated device for preparing hot or hot process water with a so-called water fitting in section, FIG. 2 shows a partial section through the water fitting according to FIG. 1 on an enlarged scale compared to FIG. 1, FIG. 3 shows a variant of a functional part of the water fitting and FIG 4 shows a functional diagram of the device according to FIGS. 1-3.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Das Gerät hat eine Wasserdurchlaufleitung 10, die von einem Wassereinlaß 12 über eine als ganzes mit der Bezugszahl 14 versehene Wasserarmatur und einen Wärmetauscher 16 zu einem Wasserauslaß 18 bzw. einem Zapfventil 20 führt. Unterhalb des Wärmetauschers 16 ist in einem nicht dargestellten Verbrennungsschacht ein rostförmiger Gasbrenner 22 angeordnet, der aus einer Gasleitung 24 gespeist ist, die mit einem Gasventil 26 versehen ist. Dieses hat ein Schließglied 28, das von einer Schließfeder 30 gegen einen Ventilsitz an der Ventilöffnung gedrückt und mit einem in diese hineinragenden, sich konisch verjüngenden Steueransatz 32 versehen ist. Der Steueransatz 32 ist so ausgebildet, daß sich eine lineare Abhängigkeit des Gasdurchsatzes vom Hub des Schließglieds 28 ergibt.The device has a water flow line 10, which leads from a water inlet 12 via a water fitting provided as a whole with the reference number 14 and a heat exchanger 16 to a water outlet 18 or a nozzle 20. Arranged beneath the heat exchanger 16 in a combustion shaft (not shown) is a rust-shaped gas burner 22 which is fed from a gas line 24 which is provided with a gas valve 26. This has a closing member 28, which is pressed by a closing spring 30 against a valve seat at the valve opening and is provided with a conically tapering control shoulder 32 projecting into it. The control approach 32 is designed so that there is a linear dependence of the gas throughput on the stroke of the closing member 28.

Die Wasserarmatur 14 enthält einen als Wassermangelsicherung dienenden Strömungsschalter 34, der eine Hochdruckkammer 36 und eine Niederdruckkammer 38 aufweist, die durch ein Kolbenglied 40 dicht voneinander getrennt sind. Dieses besteht aus einer Membran 42 (Figur 2) und einer starren Trägerplatte 44, an welcher die Membran 42 mittels angespritzter Zapfen 46 festgehalten ist. Das Kolbenglied 40 ist ferner mit einem Ventilstößel 48 fest verbunden, der abgedichtet aus der Niederdruckkammer 38 herausgeführt ist und zusammen mit dem Kolbenglied 40 ein hydraulisches Stellglied für das Gasventil 26 bildet.The water fitting 14 contains a flow switch 34 serving as a low water protection, which has a high pressure chamber 36 and a low pressure chamber 38, which are separated from each other by a piston member 40. This consists of a membrane 42 (Figure 2) and a rigid support plate 44 to which the membrane 42 is held by means of molded pins 46. The piston member 40 is also fixedly connected to a valve lifter 48, which seals is led out of the low pressure chamber 38 and together with the piston member 40 forms a hydraulic actuator for the gas valve 26.

Der Wassereinlaß 12 ist mit einer einen Wassermengenregler bzw. -begrenzer 50 aufnehmenden Kammer 52 in der Wasserarmatur 34 verbunden, von der ein Regeldurchgang 54 in die Hochdruckkammer 36 führt. Der Wassermengenregler 50, der in Figur 2 in Regelstellung gezeigt ist, hat einen Regelkolben 56, welcher von einer Regelfeder 58 nach oben an das Kolbenglied 40 angedrückt ist. Der Regelkolben 56 hat einen Regelkonus 60, der mit einer Regelkante 62 am Regeldurchgang 54 zusammenwirkend die Zuflußmenge des Wassers in die Hochdruckkammer 36 steuert bzw. regelt. An den Regelkonus 60 schließt sich nach unten ein hülsenförmiger Ansatz 63 an, der in einem in das Armaturengehäuse eingeschraubten Verschlußteil 64 verschiebbar gelagert ist und in seiner zentralen Bohrung 66 die Regelfeder 58 aufnimmt, die sich unten am Verschlußteil 64 abstützt. Die Bohrung 66 ist über Kanäle 67, 68 im Regelkolben 56 mit dem oberhalb des Regelkonus 60 liegenden Teil der Kammer 52 verbunden.The water inlet 12 is connected to a chamber 52 in the water fitting 34 which receives a water quantity regulator or limiter 50 and from which a control passage 54 leads into the high pressure chamber 36. The water quantity controller 50, which is shown in the control position in FIG. 2, has a control piston 56, which is pressed upwards by a control spring 58 against the piston member 40. The control piston 56 has a control cone 60, which cooperates with a control edge 62 at the control passage 54 to control the flow of water into the high-pressure chamber 36. At the bottom of the control cone 60 is a sleeve-shaped extension 63, which is slidably mounted in a closure part 64 screwed into the valve housing and in its central bore 66 accommodates the control spring 58, which is supported at the bottom on the closure part 64. The bore 66 is connected via channels 67, 68 in the control piston 56 to the part of the chamber 52 above the control cone 60.

Von der Hochdruckkammer 36 führt ein Kanal 70 zu einem Auslaß 72 der Wasserarmatur, in den ein Venturi 74 eingebaut ist. Die engste Stelle des Venturi 74 ist über eine enge Bohrung 76 mit der Niederdruckkammer 38 verbunden. Von der Hochdruckkammer 36 zweigen ferner zwei das Venturi 74 umgehende Bypaßkanäle 78 und 80 ab, die beide stromab des Venturi 74 in den Kanal 70 einmünden. Beide Bypaßkanäle 78, 80 sind je mit einem Steuerventil 82 bzw. 84 versehen, deren Aufbau und Funktion nachstehend noch näher beschrieben ist. In den Bypaßkanal 80 ist ferner ein Handstellventil 86 eingebaut, welches in bekannter Weise die Funktion eines Temperaturwählers für das gezapfte Wasser hat.A channel 70 leads from the high-pressure chamber 36 to an outlet 72 of the water fitting, in which a venturi 74 is installed. The narrowest point of the Venturi 74 is connected to the low-pressure chamber 38 via a narrow bore 76. From the high-pressure chamber 36 two bypass channels 78 and 80 branching off the venturi 74 also branch off, both of which open into the channel 70 downstream of the venturi 74. Both bypass channels 78, 80 are each provided with a control valve 82 and 84, the structure and function of which is described in more detail below. In the bypass channel 80, a manual control valve 86 is also installed, which has the function of a temperature selector for the tap water in a known manner.

Das Steuerventil 82 hat einen gleichachsig in den Mündungsbereich 88 des Bypaßkanals 78 hineinragenden Drosselzapfen 90, der mit der Trägerplatte 44 des Kolbengliedes 40 fest verbunden ist. Der Drosselzapfen 90 bat einen sich konisch verjüngenden Mittelabschnitt 92, dessen im Durchmesser größerer Anfangsbereich in Ruhestellung des Kolbengliedes 40 in eine Ventilöffnung 94 des Steuerventils 82 hineinragt. Am Stirnende ist der Drosselzapfen 90 mit einem im Durchmesser vergrößerten Drosselbund 96 versehen, der sich in der rechts in Figur 2 dargestellten, durch die Regelstellung des Wassermengenreglers 50 bestimmten Hubendlage des Kolbengliedes 40 in der Ventilöffnung 94 befindet und dabei deren Durchgangsquerschnitt erheblich drosselt.The control valve 82 has a throttle pin 90 projecting coaxially into the mouth region 88 of the bypass channel 78, which is firmly connected to the carrier plate 44 of the piston member 40. The throttle pin 90 has a conically tapering central section 92, the diameter-larger starting area of which, when the piston member 40 is at rest, projects into a valve opening 94 of the control valve 82. At the front end, the throttle pin 90 is provided with a throttle collar 96 which is enlarged in diameter and which is located in the valve end 94 in the stroke end position of the piston member 40 in the valve opening 94 shown in the right in FIG.

Die Ventilöffnung 94 ist an einer Buchse 98 gebildet, die verschiebbar im Mündungsbereich 88 des Bypaßkanales 78 gelagert ist und deren axiale Lage durch eine Verstelleinrichtung 100 in vorgegebenen Grenzen einstellbar ist. Die Verstelleinrichtung 100 hat einen im Armaturengehäuse drehbar gelagerten, mit einem Schraubenkopf 102 versehenen Stellstift 104, der am inneren Ende einen Exzenterbolzen 106 trägt, welcher in eine Ausnehmung am Umfang der Buchse 98 eingreift. Der Schraubenkopf 102 ist mit einem Querschlitz 108 für das Einsetzen eines Werkzeugs zum Drehen des Stellstiftes 104 versehen, dessen Lagerstellen über O-Ringe 110 und 112 abgedichtet sind und der in der eingestellten Lage durch eine gegen den Schraubenkopf 102 drückende Spannschraube 113 festgelegt ist.The valve opening 94 is formed on a bushing 98 which is slidably mounted in the mouth region 88 of the bypass channel 78 and whose axial position can be set within predetermined limits by an adjusting device 100. The adjusting device 100 has an actuating pin 104 which is rotatably mounted in the valve housing and is provided with a screw head 102 and which carries an eccentric bolt 106 at the inner end which engages in a recess on the circumference of the bushing 98. The screw head 102 is provided with a transverse slot 108 for the insertion of a tool for turning the setting pin 104, the bearing points of which are sealed by O-rings 110 and 112 and which is fixed in the set position by a clamping screw 113 pressing against the screw head 102.

Das Steuerventil 84 des über das Handstellventil 86 führenden Bypaßkanals 80 hat ebenfalls einen sich konisch verjüngenden, am Kolbenglied 40 befestigten Drosselzapfen 114, der gleichachsig zu einem Mündungsbereich 116 des Bypaßkanals 80 angeordnet ist und einen Durchgangsquerschnitt nach Maßgabe der Hubstellung des Kolbengliedes 40 steuert. Die Ventilöffnung des Steuerventils 84 kann analog zum Steuerventil 82 an einer axial einstellbaren Buchse im Mündungsbereich 116 des Bypaßkanals 80 angeordnet sein. Bei einer vereinfachten Ausführung kann der Drosselzapfen gemäß Figur 3 auch durch eine Ausformung 114a der Trägerplatte 44a gebildet sein.The control valve 84 of the bypass channel 80 leading via the manual control valve 86 also has a conically tapering throttle pin 114 fastened to the piston member 40, which is arranged coaxially with a mouth region 116 of the bypass channel 80 and one Passage cross section controls according to the stroke position of the piston member 40. The valve opening of the control valve 84 can be arranged analogously to the control valve 82 on an axially adjustable bushing in the mouth region 116 of the bypass channel 80. In a simplified embodiment, the throttle pin according to FIG. 3 can also be formed by a shape 114a in the carrier plate 44a.

Der Wassermengenregler 50 kann durch Lösen des Verschlußteils 64 nach außen ausgebaut werden. Zum unverlierbaren Festhalten des Regelkolbens 56 und der Regelfeder 58 am Verschlußteil 64 ist an diesem ein dünnwandiger Bördelkragen 120 vorgesehen, der zunächst parallel zur Reglerachse steht und nach dem Hindurchstecken des hülsenförmigen Ansatzes 63 des Regelkolbens 56 nach innen umgelegt wird. In das Verschlußteil 64 ist ferner ein Überdruckventil 122 eingebaut, dessen Schließkraft von außen durch Drehen eines die Schließfeder stützenden Schraubstopfens 124 einstellbar ist.The water quantity regulator 50 can be removed by loosening the closure part 64 to the outside. In order to hold the control piston 56 and the control spring 58 captively on the closure part 64, a thin-walled flanged collar 120 is provided on it, which is initially parallel to the control axis and, after the sleeve-shaped extension 63 of the control piston 56 has been inserted, is folded inwards. A pressure relief valve 122 is also installed in the closure part 64, the closing force of which can be adjusted from the outside by turning a screw plug 124 supporting the closing spring.

Nachstehend ist die Wirkungsweise des Gerätes anhand des Funktionsschaubildes nach Figur 4 beschrieben, wobei die Funktionen des Venturi 74 und des Strömungsschalters 34 als bekannt vorausgesetzt und nicht näher erläutert sind.The mode of operation of the device is described below with reference to the functional diagram according to FIG. 4, the functions of the Venturi 74 and the flow switch 34 being assumed to be known and not being explained in more detail.

Im Funktionsschaubild sind über der auf die Zeiteinheit bezogenen Durchlaufmenge Q des Wassers der Stellhub h des Strömungsschalters 34 und die Temperaturerhöhung Delta t aufgetragen, die das Wasser beim Durchlauf durch das Gerät erfährt. Bei geschlossenem Handstellventil 86 (Heißwasserbereitung) spricht der Strömungsschalter 34 bei einem Wasserdurchfluß von ca. 1,8 l/min an, wobei er das Schließglied 28 des Gasventils 26 von seinem Sitz abhebt. Beim weiteren Aufdrehen des Zapfventils 20 und ansteigender Durchlaufmenge Q nimmt der Stellhub h gemaß der Linie a linear zu, bis die Durchlaufmenge Q etwa den vom Wassermengenregler 50 eingestellten Begelwert von ca. 7,5 l/min erreicht hat. Die Linearität in dem durch die Linie a gekennzeichneten Funktionsbereich wird durch das Steuerventil 82 sichergestellt, daß mit zunehmender Durchflußmenge Q eine zunehmend größere Teilmenge des aus der Hochdruckkammer 36 abströmenden Wassers über den Bypaßkanal 78 am Venturi 74 vorbeileitet und dadurch dessen überproportionale Wirkung auf das für das Linearverhalten notwendige Maß zurückführt.In the functional diagram, the actuating stroke h of the flow switch 34 and the temperature increase Delta t, which the water experiences during the passage through the device, are plotted against the passage quantity Q of the water related to the time unit. When the manual control valve 86 is closed (hot water preparation), the flow switch 34 responds at a water flow of approximately 1.8 l / min, lifting the closing member 28 of the gas valve 26 from its seat. When the nozzle 20 is opened further and the throughput increases The linear stroke h increases linearly according to the line a until the flow rate Q has approximately reached the desired value of about 7.5 l / min set by the water volume controller 50. The linearity in the functional area marked by the line a is ensured by the control valve 82 that, with an increasing flow rate Q, an increasingly larger portion of the water flowing out of the high-pressure chamber 36 bypasses the venturi 74 via the bypass channel 78 and thereby its disproportionate effect on that for the Linear behavior returns the necessary measure.

Im Linearbereich a des Stellhubes h steigt auch der Öffnungshub des Gasventil-Schließgliedes 28 linear mit der Durchflußmenge Q an. Dabei stellt der Steueransatz 32 am Schließglied 28 sicher, daß auch die dem Brenner 22 zugeführte Gasmenge linear mit der Durchflußmenge Q des Wassers zunimmt und umgekehrt. Das hat zur Folge, daß die Temperatur des gezapften Wassers bereits von der zum Öffnen des Gasventils 26 notwendigen Mindestmenge von ca. 1,8 l/min an bis zur Regelmenge von ca. 7,5 l/min annähernd den vorgeschriebenen Wert der Temperaturerhöhung von beispielsweise ca. 50° K erfährt. Im Funktionsschaubild ist der Temperaturverlauf des gezapften Heißwassers durch die Linie b dargestellt, gemäß welcher sich bei einer angenommenen Zulauftemperatur des Wassers von 10 °C eine Auslauftemperatur von ca. 60 °C ergibt.In the linear range a of the actuating stroke h, the opening stroke of the gas valve closing element 28 also increases linearly with the flow rate Q. The control approach 32 on the closing member 28 ensures that the amount of gas supplied to the burner 22 increases linearly with the flow rate Q of the water and vice versa. The consequence of this is that the temperature of the drawn-off water from the minimum quantity required to open the gas valve 26 of approximately 1.8 l / min to the regulating quantity of approximately 7.5 l / min is approximately the prescribed value of the temperature increase of experiences about 50 ° K, for example. In the functional diagram, the temperature profile of the drawn-off hot water is represented by line b, according to which an outlet temperature of approx. 60 ° C results when the water inlet temperature is assumed to be 10 ° C.

Durch die unvermeidliche u Fertigungstoleranzen an den Funktionsteilen der Wasserarmatur 34 und des Gasventils 26 wird bei einem voreingestellten Gerät die tatsächliche Kennlinie des Stellhubes h in einem Streubereich liegen, der im Funktionsschaubild durch die beiden Grenzkennlinien a₁ und a₂ angedeutet ist. Demzufolge wird zunächst auch der tatsächliche Verlauf der Temperaturerhöhung Delta t über der Durchflußmenge Q in einem Bereich liegen, der durch die beiden Grenzkennlinien b₁ und b₂ angedeutet ist. Am installierten Gerät können die Kennlinien durch entsprechendes axiales Verstellen der Buchse 98 des Steuerventils 82 wie im Funktionsschaubild gezeigt in die Mitte der Streubereiche gebracht werden, wo sich der einer Geraden am weitesten angenäherte Temperaturverlauf b ergibt.Due to the unavoidable u manufacturing tolerances on the functional parts of the water valve 34 and the gas valve 26, the actual characteristic curve of the actuating stroke h will lie in a spreading range at a preset device, which is indicated in the functional diagram by the two limit characteristic curves a 1 and a 2. Accordingly, the actual course of the temperature increase becomes delta t lie above the flow rate Q in a range which is indicated by the two limit characteristics b₁ and b₂. On the installed device, the characteristic curves can be brought into the center of the scattering ranges by corresponding axial adjustment of the bushing 98 of the control valve 82, as shown in the functional diagram, where the temperature curve b most approximated to a straight line results.

Kurz vor Erreichen der Regelwassermenge von ca. 7,5 l/min tritt der Drosselbund 96 am Drosselzapfen 90 in die Ventilöffnung 94 ein, wonach die überproportionale Wirkung des Venturi 74 voll zur Geltung kommt und das Kolbenglied 40 des Strömungsschalters 34 bereits bei einer minimalen weiteren Steigerung des Wasserdurchsatzes in die der Regelstellung des Wassermengenreglers 50 entsprechende Hubstellung gelangt. Dabei ist die Anordnung so getroffen, daß das Gasventil 26 bereits bei Wirksamwerden des Drosselbundes 96 voll geöffnet ist, so daß die volle Leistung des Brenners 22 mit Sicherheit erreicht wird.Shortly before the regulating water volume of approx. 7.5 l / min is reached, the throttle collar 96 on the throttle pin 90 enters the valve opening 94, after which the disproportionate effect of the Venturi 74 comes into its own and the piston member 40 of the flow switch 34 already has a minimal further effect Increasing the water throughput reaches the stroke position corresponding to the control position of the water quantity regulator 50. The arrangement is such that the gas valve 26 is already fully open when the throttle collar 96 takes effect, so that the full output of the burner 22 is achieved with certainty.

Wenn der Benutzer Wasser mit einer geringeren Auslauftemperatur als 60 °C bzw. einer geringeren Temperaturerhöhung als 50° K zapfen möchte, macht er über das Handstellventil 86 den Bypaßkanal 80 entsprechend weit auf. Im Funktionsschaubild sind die Verhältnisse bei voll geöffnetem Handstellventil 86 dargestellt. Dabei sei zunächst angenommen, daß der Bypaßkanal 80 wie beim Stand der Technik nur vom Handstellventil 86 überwacht ist und das erfindungsgemäß vorgesehene Steuerventil 84 im Bypaßkanal 80 fehlt. Dann würde der Strömungsschalter 34 erst bei einer Durchflußmenge von ca. 6 l/min. ansprechen und das Gasventil 26 öffnen. Danach würde der Stellhub h mit weiter ansteigender Durchflußmenge Q nach der Kennlinie d ansteigen und sich dabei ein Verlauf der Temperaturerhöhung Delta t gemäß der Kennlinie e ergeben. Die Kennlinie e macht deutlich, daß beim Zapfen von Warmwasser dessen Auslauftemperatur in erheblichem Maß von der auf die Zeiteinheit bezogenen Durchflußmenge abhängig ist, wenn dem Handstellventil 86 keine stellhubabhängigen Korrekturmittel zugeordnet sind.If the user wants to tap water with a lower outlet temperature than 60 ° C or a lower temperature increase than 50 ° K, he opens the bypass channel 80 accordingly by means of the manual control valve 86. The conditions are shown in the functional diagram when the manual control valve 86 is fully open. It is initially assumed that the bypass channel 80, as in the prior art, is only monitored by the manual control valve 86 and the control valve 84 provided according to the invention is missing in the bypass channel 80. Then the flow switch 34 would only at a flow rate of about 6 l / min. respond and open the gas valve 26. Thereafter, the actuating stroke h would increase with a further increase in the flow rate Q according to the characteristic curve d and a course of the temperature increase Delta t would result according to the characteristic curve e. The characteristic curve e makes it clear that when dispensing hot water, the outlet temperature of which depends to a considerable extent on the flow rate based on the time unit, if the manual control valve 86 is not assigned any adjustment stroke-dependent correction means.

Durch die erfindungsgemäße Anordnung eines zum Handstellventil 86 in Reihe liegenden Steuerventils 84 wird beim Aufdrehen des Zapfventils 20 der Bypaßkanal 80 durch das Steuerventil 84 zunächst erheblich gedrosselt, wie Figur 1 leicht erkennen läßt. Das hat zur Folge, daß der Ansprechpunkt des Strömungsschalters 34 auf eine Durchflußmenge von ca. 3,7 l/min vorverlegt wird. Danach nimmt infolge der konischen Ausbildung der Drosselzapfen 114 und 90 und somit der zunehmenden Freigabe der Bypaßkanäle 80 und 78 der Stellhub h des Strömungsschalters 34 gemäß Kennlinie f wiederum im wesentlichen linear zu, bis sie in einen steileren Ast g übergeht, wenn der Drosselbund 96 am Drosselzapfen 90 in die Ventilöffnung 94 eintritt.As a result of the arrangement according to the invention of a control valve 84 lying in series with the manual control valve 86, the bypass channel 80 is initially throttled considerably by the control valve 84 when the nozzle 20 is opened, as can easily be seen in FIG. As a result, the response point of the flow switch 34 is brought forward to a flow rate of approximately 3.7 l / min. Thereafter, due to the conical design of the throttle pegs 114 and 90 and thus the increasing release of the bypass channels 80 and 78, the actuating stroke h of the flow switch 34 in accordance with characteristic curve f again increases substantially linearly until it changes to a steeper branch g when the throttle collar 96 on Throttle pin 90 enters valve opening 94.

Die beiden Steuerventile 82 und 84 sind so aufeinander und auf das Gasventil 26 bzw. dessen Schließglied 28 abgestimmt, daß praktisch bereits ab der minimalen Durchflußmenge von ca. 3,7 l/min bis zu der vom Wassermengenregler 50 begrenzten maximalen Durchflußmenge von ca. 11 l/min die Gaszufuhr zum Wasserdurchsatz annähernd proportional ansteigt und umgekehrt, so daß sich gemäß Kennlinie i ein annähernd konstanter Verlauf der Temperaturerhöhung Delta t ergibt.The two control valves 82 and 84 are so matched to one another and to the gas valve 26 or its closing member 28 that practically from the minimum flow rate of approx. 3.7 l / min up to the maximum flow rate of approx. 11 limited by the water quantity controller 50 l / min the gas supply to the water throughput increases approximately proportionally and vice versa, so that, according to characteristic curve i, the temperature increase delta t is approximately constant.

Bei zunehmender Drosselung des Bypaßkanals 80 durch das Handstellventil 86 verschiebt sich der Ansprechpunkt des Strömungsschalters 34 auf der Abszisse des Funktionsschaubildes vom Wert Q = ca. 3,7 l/min gegen den Wert Q = ca. 1,8 l/min hin, der sich einstellt, wenn das Handstellventil 86 der Forderung nach höchster Zapfwassertemperatur entsprechend ganz geschlossen ist.With increasing throttling of the bypass channel 80 by the manual control valve 86, the response point of the flow switch 34 on the abscissa of the functional diagram shifts from the value Q = approx. 3.7 l / min against the value Q = approx. 1.8 l / min occurs when the manual control valve 86 is completely closed in accordance with the requirement for the highest tap water temperature.

Claims (7)

  1. Gas instantaneous water heater, comprising a venturi (74) in the water passage (10), the narrowest cross-section of which venturi is connected to the low-pressure chamber (38) of a flow switch (34) whose high-pressure chamber (36) is pressurized by the admission pressure of the venturi (74) and is separated from the low-pressure chamber (38) by a piston member (40) which, together with a stem (48), forms a hydraulic actuator for a gas valve (26) and acts both on a water-quantity regulator or limiter (50) in the inflow (12) to the high-pressure chamber (36) and on a control member (56) which, in coordination with the gas valve (26), influences the flow in the venturi (74) in such a way that, after the response of the flow switch (34), the gas supply increases at least approximately linearly with the water throughput and vice versa, furthermore comprising two bypass channels (78, 80) which bypass the venturi (74), of which one (80) runs via a manual regulating valve (86), via which the user can selectively set the temperature of the heated water within limits, and the other (78) contains a first control valve (82), influenced by the flow switch (34), for constancy of the hot-water temperature, characterized in that the bypass channel (80), running via the manual regulating valve (86), is monitored by a second control valve (84), which is arranged in series with the manual regulating valve (86), in that the two control valves (82, 84) have valve members (90, 114) which influence the cross-sections of passage of the respective bypass channel (78, 80) and are firmly connected to the piston member (40) and in that the valve member (114) of the second control valve (84), influenced by the actuator (40, 48) of the flow switch (34), controls the cross-section of passage of the bypass channel (80) in such a way that, even when manual regulating valve (86) is fully or partly opened and the dispensing temperature is correspondingly reduced, after the response of the flow switch (34) the gas supply increases at least approximately linearly with the water throughput and vice versa, which leads to a constancy of the hot-water temperature.
  2. Gas instantaneous water heater, comprising a venturi (74) in the water passage (10), the narrowest cross-section of which venturi is connected to the low-pressure chamber (38) of a flow switch (34) whose high-pressure chamber (36) is pressurized by the admission pressure of the venturi (74) and is separated from the low-pressure chamber (38) by a piston member (40) which, together with a stem (48), forms a hydraulic actuator for a gas valve (26) and acts both on a water-quantity regulator or limiter (50) in the inflow (12) to the high-pressure chamber (36) and on a control member (56) which, in coordination with the gas valve (26), influences the flow in the venturi (74) in such a way that, after the response of the flow switch (34), the gas supply increases at least approximately linearly with the water throughput and vice versa, furthermore comprising two bypass channels (78, 80) which bypass the venturi (74), of which one (80) runs via a manual regulating valve (86), via which the user can selectively set the temperature of the heated water within limits, and the other (78) contains a first control valve (82), influenced by the flow switch (34), for constancy of the hot-water temperature, characterized in that the bypass channel (80), running via the manual regulating valve (86), is monitored by a second control valve (84), which is arranged in series with the manual regulating valve (86) and its adjustable valve member (114), influenced by the actuator (40, 48) of the flow switch (34), controls a cross-section of passage of the bypass channel (80), and in that the movable valve member (90) of the first control valve (82) for constancy of the hot-water temperature is a restrictor plug (90) which projects axially into the valve port (94) of the control valve (82), tapers towards its free end and has there a restrictor collar (96) enlarged in diameter, so that, even when manual regulating valve (86) is fully or partly opened and the dispensing temperature is correspondingly reduced, after the response of the flow switch (34) the gas supply increases at least approximately linearly with the water throughput and vice versa, which leads to a constancy of the hot-water temperature.
  3. Water heater according to Claim 1 or 2, characterized in that the first control valve (82) is coordinated with the gas valve (26) in such a way that, after a linear section of the regulating stroke characteristic (a or f) of the flow switch (34), an excess stroke (c or g) commences which no longer increases the gas supply or does not increase it beyond a predetermined maximum value.
  4. Water heater according to any of the preceding claims, characterized in that the valve port (94) of at least one control valve (82) is formed on a bush (98) which is inserted into the bypass channel (78) and whose position relative to the movable valve member (90) can be adjusted within predetermined limits.
  5. Water heater according to any of the preceding claims, characterized in that both bypass channels (78, 80) lead out from the high-pressure chamber (36) of the flow switch (34) along an axis parallel to its actuator (40, 48) and the movable valve members (90, 114) of the two control valves (82, 84) are designed as tapering restrictior plugs projecting axially into the orifice areas (88, 116) of the bypass channels.
  6. Water heater according to any of the preceding claims, characterized in that the piston member (40) of the flow switch (34) consists of a diaphragm (42) and a support plate (44) which is firmly connected to this diaphragm (42) and to which the two movable valve members (90,114) of the control valves (82, 84) are fixed.
  7. Water heater according to Claim 6, characterized in that at least one valve member is formed by a formed-out section (114a) of the support plate (44a).
EP89903459A 1988-03-30 1989-03-22 Gas-fired instantaneous water heater Expired - Lifetime EP0429450B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3810836A DE3810836A1 (en) 1988-03-30 1988-03-30 GAS HEATED CONTINUOUS WATER HEATER
DE3810836 1988-03-30
PCT/DE1989/000180 WO1989009367A1 (en) 1988-03-30 1989-03-22 Gas-fired instantaneous water heater

Publications (2)

Publication Number Publication Date
EP0429450A1 EP0429450A1 (en) 1991-06-05
EP0429450B1 true EP0429450B1 (en) 1995-06-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP89903459A Expired - Lifetime EP0429450B1 (en) 1988-03-30 1989-03-22 Gas-fired instantaneous water heater

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EP (1) EP0429450B1 (en)
KR (1) KR900700826A (en)
AU (1) AU3282589A (en)
DE (2) DE3810836A1 (en)
ES (1) ES2013131A6 (en)
PT (1) PT90155B (en)
WO (1) WO1989009367A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61228355A (en) * 1985-04-03 1986-10-11 Green Cross Corp:The Method and apparatus for automatically detecting agglutination reaction
ES2065804B1 (en) * 1992-02-27 1997-04-16 Fagor S Coop IMPROVEMENTS INTRODUCED IN INSTANT GAS WATER HEATERS.
EP1852654A3 (en) * 2006-05-03 2015-11-04 Vaillant GmbH Water switch for gas water heater

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1194753A (en) * 1957-05-31 1959-11-12 Vaillant Joh Kg Instant water heater with diaphragm flow regulator
FR76864E (en) * 1959-09-29 1961-12-15 Vaillant Joh Kg Instant water heater with diaphragm flow regulator
DE1171138B (en) * 1960-07-16 1964-05-27 Godesia Werk Badeapp Und Metal Low water protection for water heater
FR92079E (en) * 1967-03-17 1968-09-20 Chaffoteaux Et Maury Improvements to water heaters
DE1679694A1 (en) * 1967-10-20 1971-04-08 Junkers & Co Gas-heated instant water heater with a low water protection device
BE794663A (en) * 1972-06-26 1973-07-30 Leblanc Sa IMPROVEMENT FOR THE IGNITION OF BURNERS OF GAS APPLIANCES, SUCH AS WATER HEATERS, BATH HEATERS, CENTRAL HEATING BOILERS, GAS RADIATORS AND THE LIKE
DE2330486A1 (en) * 1973-06-15 1975-01-16 Junkers & Co Gas-fired continuous-flow water heater regulator - with venturi's narrowest section penetrated by variable-section control plug membrane
FR2373004A1 (en) * 1976-12-03 1978-06-30 Saunier Duval Magnetically operated gas heater governor - has toothed ring rotated by external member to adjust air passages through valve member
FR2541434B1 (en) * 1983-02-23 1987-01-30 Vaillant Sarl INSTANTANEOUS GAS WATER HEATER

Also Published As

Publication number Publication date
ES2013131A6 (en) 1990-04-16
DE58909312D1 (en) 1995-07-27
WO1989009367A1 (en) 1989-10-05
DE3810836A1 (en) 1989-10-12
KR900700826A (en) 1990-08-17
PT90155B (en) 1994-05-31
AU3282589A (en) 1989-10-16
EP0429450A1 (en) 1991-06-05
PT90155A (en) 1989-11-10

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