EP0366971A1 - Device for preventing dripping in a hot water heater - Google Patents

Device for preventing dripping in a hot water heater Download PDF

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Publication number
EP0366971A1
EP0366971A1 EP89118532A EP89118532A EP0366971A1 EP 0366971 A1 EP0366971 A1 EP 0366971A1 EP 89118532 A EP89118532 A EP 89118532A EP 89118532 A EP89118532 A EP 89118532A EP 0366971 A1 EP0366971 A1 EP 0366971A1
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EP
European Patent Office
Prior art keywords
water
chamber
jet pump
valve
mixing valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89118532A
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German (de)
French (fr)
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EP0366971B1 (en
Inventor
Franz Dr. Bogdanski
Ernst Appun
Klaus-Dieter Wahnschaffe
Klaus Schütz
Gerd Schultes
Robert Kreikenbohm
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Stiebel Eltron GmbH and Co KG
Original Assignee
Stiebel Eltron GmbH and Co KG
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Publication date
Priority claimed from DE19883836877 external-priority patent/DE3836877C1/en
Application filed by Stiebel Eltron GmbH and Co KG filed Critical Stiebel Eltron GmbH and Co KG
Priority to AT89118532T priority Critical patent/ATE72893T1/en
Publication of EP0366971A1 publication Critical patent/EP0366971A1/en
Application granted granted Critical
Publication of EP0366971B1 publication Critical patent/EP0366971B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1008—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system expansion tanks

Definitions

  • the invention relates to a device in a water heater to avoid dripping at its overflow open to the environment when heating the water reservoir, with a water jet pump in the cold water inlet of the water reservoir, the water when opening the water valve in front of the water reservoir at a suction opening from a Sucks chamber, wherein after the nozzle valve closes water flows back through the suction opening into the chamber, which is closed to the environment at least when the water is sucked out of the chamber, and that the water-absorbing space of the chamber is at least closed to the environment when the chamber is filled with water.
  • the water jet pump is placed in the cold water line to the low-pressure hot water tank, i.e. in a line section through which cold water flows only when hot water is requested through the appropriate position on a mixer valve of a fitting. This is because only as much hot water is pressed out of the water reservoir as cold water is flowing in at the same time. If the user wants to tap cold water, the mixing valve is adjusted so that bypassing the hot water tank and the water jet pump cold water is transferred directly to the overflow via the tap valve.
  • the disadvantage of this arrangement is that the water jet pump represents an additional pipe constriction, which in the case of low-pressure hot water storage tanks basically becomes undesirable during dispensing Pressure increase inside the device leads.
  • another disadvantage of this arrangement is that the water jet pump is located in the hot water-carrying area, so that it is nevertheless exposed to a considerable risk of calcification.
  • the object of the invention is to avoid the disadvantages mentioned above, i.e. to achieve that, on the one hand, the entire amount of water that can be taken from a hot water fitting is passed through the water jet pump, and this with a water temperature at which water hardly tends to precipitate lime.
  • the chamber need not be designed to be pressure-resistant.
  • the invention achieves this in that the water jet pump is arranged in a pipe section which lies between the nozzle valve and the mixing valve. Further advantageous embodiments result from the subclaims.
  • a line (1) coming from the house supply network is followed by a nozzle (2) which is connected via a pipe section (3) to a mixing valve (4).
  • the mixing valve (4) is set by means of a cam, whether the inflowing water with its total volume of the cold water inflow line (5) of a low-pressure hot water tank (9) is fed, which would be equivalent to a temperature setting "hot”; whether the total amount of water flowing in via the line (8) to the overflow (7) of the fitting is fed directly, which would be equivalent to a "cold” temperature setting; or whether it is achieved by an intermediate position that a partial amount of water is transferred to the storage, while another partial amount flows directly via the pipe (8) into the overflow (7), which would be equivalent to a temperature setting "medium”.
  • Cold water entering the cold water inflow line (5) simultaneously displaces hot water from the reservoir (9), which flows through the hot water pipe (6) into the overflow (7).
  • a water jet pump (10) is now arranged according to the invention, which is connected via a suction line (11) to a chamber (12) which has a suction opening (13), this suction opening (13 ) against the environment at least when the water is sucked out of the chamber (12), and that the water-absorbing space of the chamber (12) against the environment is at least closed when the chamber (12) is filled with water.
  • the chamber (12) itself can consist of a bellows, a hose or a balloon-like, elastic body. Care must be taken that the chamber (12) is constructed in such a way that it can withstand the negative pressure generated by the water jet pump and that it can at least withstand the pressure of the dripping water filling it.
  • Such a low-pressure mixing valve (15) is shown in FIG.
  • the line (1) coming from the house installation network which ends at a nozzle (2), from where a pipe section (3) branches off, which in turn ends in a mixing chamber (14).
  • the mixing chamber (14) is connected via a cam disc to a line (8) and a further bore which leads to the cold water inflow line (5), which in turn acts as an inflow line to the low-pressure accumulator.
  • the total amount of water drawn can now either be fed to the line (8) or to the cold water inflow line (5) leading to the low-pressure hot water tank (9), or the water flow to these two pipes can can also be divided in a mixing ratio so that water with a desired temperature flows out at the overflow (7).
  • a pipe section (3) which receives the water jet pump (10) is provided within the connection between the nozzle valve (2) and the mixing valve (4).
  • the pipe section (3) can be reached from the outside, so that a previously made water jet pump can be inserted into this pipe section and fixed there .
  • Such a separately manufactured water jet pump is shown in FIG. 4.
  • the water jet pump (10) can also be manufactured during the manufacture of the pipe section (3). This requires two drills, one at the front having the contour of the inlet cross-section and the other at the front having the contour of the outlet cross-section of the water jet pump (10). Both drills move during the manufacture of the Pipe section (3) and the water jet pump (10) on the same level to each other that they meet where the intake pipe (11) opens, in such a way that the intake pipe (11) opens into a region of the water jet pump (10) where it creates negative pressure when water flows through it.
  • the chamber (12) is connected to the suction line (11) in a manner not shown in FIG. 2.
  • the chamber (12) is preferably installed in the dead space behind a sink or sink, or behind the low-pressure hot water tank (9), so that it does not appear visually. A possibly defective chamber (12) can be easily replaced with a new one.
  • a check valve (16) is inserted into the line (8).
  • the check valve (16) has the task that the chamber (12) sucks back water only from the hot water tank (9) after a tap operation. This ensures that even larger amounts of water can be sucked back, for example when a larger hot water tank is operated, which inevitably produces more expansion water during a heating process. With this measure, not only water can be extracted from the tap, but also from the hot water tank while lowering the water level. In such a case, the chamber (12) must be placed under the water level of the water heater.
  • the device works as follows: If the nozzle valve (2) is opened, then cold water flows through the pipe section (3) into the mixing chamber (14) of the mixing valve (4) and from here either into the cold water inflow line (5) or into line (8) or but together with corresponding partial water quantities in the pipelines (5, 8). Water flowing into the cold water inflow line (5) presses hot water from the low pressure water reservoir (9) via the hot water pipe (6) to the overflow (7). The transition from the hot water pipe (6) to the overflow (7) is in the fitting according to FIG. 2 behind the pipe section (3). The water jet pump (10) sucks water out of the chamber (12) via the suction line (11) and the suction opening (13) and mixes it into the cold water flow accordingly.
  • the volume of the chamber (12) should be so large that approx. 3%, i.e. have about 150 cm3 of water in their place. If the water jet pump works well, it can add about 30% water from the chamber (12) to its own volume flow, so that a through-flowing volume of approximately 450 cm3 is necessary to completely empty the chamber (12). This is just under 1/2 l, which occurs practically with every tap. Of course, the device works just as well if less water is drawn, because it can also be assumed that correspondingly less water will be removed from the storage tank and thus less water will have to be reheated.
  • the mixing valve (4) is switched to direct passage to the low-pressure hot water tank (9), which corresponds to a "hot" temperature setting, the chamber (12) sucks water out of the tank via the cold water supply line (5) after the tap process has been completed 9) back, so that there is now a lowering of the water level inside the fitting or in the piping connected to the fitting, if not a lowering of the water level inside the reservoir itself. This depends on the size of the chamber (12) determined.
  • a water jet pump is always indicated as a vacuum-generating element.
  • a Venturi nozzle can also be used here, which is equivalent in its effect to the water jet pump.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Multiple-Way Valves (AREA)
  • Percussion Or Vibration Massage (AREA)

Abstract

A device for preventing dripping in a hot water heater at its overflow (7) open to the outside during heating-up of the water storage tank (9) is proposed. The said device is provided with a water-jet pump (10) which is arranged in a pipe section (3) between a tap valve (2) and a mixing valve (4) of a low-pressure mixing fixture (15). The water-jet pump (10) is connected via a suction pipe (11) to a chamber (12). As long as water is being drawn, the water-jet pump (10) sucks water from the chamber (12). When the drawing is finished, the chamber (12) fills with water again, which is either sucked back from the fixture piping or from the warm water heater. The space which is thereby freed can fill with expansion water on subsequent heating. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Vorrichtung bei einem Warmwasserbereiter zum Vermeiden des Tropfens an seinem zur Umgebung offenen Überlauf beim Aufheizen des Wasserspeichers, mit einer Wasserstrahlpumpe im Kaltwasserzulauf des Wasserspeichers, die beim Öffnen des im Wasserweg vor dem Wasserspeicher liegenden Zapfventils Wasser an einer Ansaugöffnung aus einer Kammer absaugt, wobei nach dem Schließen des Zapfventils Wasser über die Ansaugöffnung in die Kammer zurückfließt, die gegen die Umgebung wenigstens dann abgeschlossen ist, wenn das Wasser aus der Kammer gesaugt ist, und daß der wasseraufnehmende Raum der Kammer gegen die Umgebung wenigstens dann abgeschlossen ist, wenn die Kammer wassergefüllt ist.The invention relates to a device in a water heater to avoid dripping at its overflow open to the environment when heating the water reservoir, with a water jet pump in the cold water inlet of the water reservoir, the water when opening the water valve in front of the water reservoir at a suction opening from a Sucks chamber, wherein after the nozzle valve closes water flows back through the suction opening into the chamber, which is closed to the environment at least when the water is sucked out of the chamber, and that the water-absorbing space of the chamber is at least closed to the environment when the chamber is filled with water.

Hier ist die Wasserstrahlpumpe in den Kaltwasserstrang zum Niederdruck-Warmwasserspeicher gelegt, also in einen Strangabschnitt, der nur dann von Kaltwasser durchflossen ist, wenn durch entsprechende Stellung an einem Mischventil einer Armatur Warmwasser angefordert wird. Dies liegt daran, daß immer nur soviel Warmwasser aus dem Wasserspeicher gedrückt wird, wie gleichzeitig Kaltwasser zufließt. Will der Benutzer Kaltwasser zapfen, so wird das Mischventil so verstellt, daß unter Umgehung des Warmwasserspeichers und der Wasserstrahlpumpe Kaltwasser über das Zapfventil direkt in den Überlauf überführt wird.Here, the water jet pump is placed in the cold water line to the low-pressure hot water tank, i.e. in a line section through which cold water flows only when hot water is requested through the appropriate position on a mixer valve of a fitting. This is because only as much hot water is pressed out of the water reservoir as cold water is flowing in at the same time. If the user wants to tap cold water, the mixing valve is adjusted so that bypassing the hot water tank and the water jet pump cold water is transferred directly to the overflow via the tap valve.

In solchen Fällen, wo nur niedrig temperiertes Wasser gezapft wird, fließt auch nur wenig Wasser durch die Wasserstrahlpumpe, so daß in diesen Fällen nur ein geringer Unterdruck an der Wasserstrahlpumpe erzeugt wird.In such cases where only low temperature water is tapped, only a little water flows through the water jet pump, so that in these cases only a slight negative pressure is generated at the water jet pump.

Dadurch kommt es auch nur zu einem Zurücksaugen von wenig Wasser aus der Verrohrung der Armatur bzw. aus dem Warmwasserbereiter. Es besteht in solchen Fällen die Gefahr, daß es trotz dieser Einrichtung dennoch zu einem Nachtropfen an der Armatur kommt, wenn nämlich mehr Ausdehnungswasser entsteht, als vorher abgesaugt wurde.As a result, only a little water is sucked back out of the piping of the fitting or from the water heater. In such cases, there is a risk that, despite this device, dripping will still occur on the valve if more expansion water is produced than was previously suctioned off.

Solange Kaltwasser gezapft wird, führt dies zu einem Druckanstieg innerhalb des Warmwasserbereiters und damit auch in der Kammer. Dieser Druckanstieg kann je nach Zapfmenge pro Zeiteinheit durchaus 1 bar betragen. Daher muß die Kammer so ausgebildet sein, daß sie diesem Druck standhalten kann. Dies ist fertigungstechnisch aufwendig.As long as cold water is drawn, this leads to an increase in pressure inside the water heater and thus also in the chamber. This pressure increase can be 1 bar depending on the dispensing volume per unit of time. The chamber must therefore be designed so that it can withstand this pressure. This is complex in terms of production technology.

In der gleichen Patentanmeldung ist aber auch bereits der Vorschlag gemacht worden, die Wasserstrahlpumpe unmittelbar an die tiefste Stelle sowohl des warmwasser­als auch des kaltwasser-führenden Auslaufs zu legen was dann dazu führt, daß die gesamte Wassermenge, also Kaltwasser, Mischwasser wie auch Heißwasser, über die Wasserstrahlpumpe geführt wird, so daß es hier zu einem kräftigen Unterdruck kommt, der gewährleistet, daß in jedem Fall soviel Wasser während des Zapfens abgesaugt wird daß das Volumen des abgesaugten Wassers in jedem Falle größer ist als das Volumen das sich bei einem nachfolgenden Nacherwärmungs-Vorgang möglicherweise einstellen kann.In the same patent application, however, the proposal has already been made to place the water jet pump directly at the lowest point of both the hot water and the cold water-leading outlet, which then leads to the total amount of water, i.e. cold water, mixed water and hot water, being above the water jet pump is guided, so that there is a strong negative pressure here, which ensures that in any case so much water is drawn off during the dispensing that the volume of the water drawn off is in any case greater than the volume that occurs during a subsequent reheating Operation may stop.

Der Nachteil dieser Anordnung besteht einmal darin, daß die Wasserstrahlpumpe eine zusätzliche Rohrverengung darstellt, was bei Niederdruck-Heißwasserspeichern grundsätzlich während des Zapfens zu einer unerwünschten Druckerhöhung innerhalb des Gerätes führt. Andererseits besteht ein weiterer Nachteil dieser Anordnung darin, daß die Wasserstrahlpumpe im heißwasser-führenden Bereich­liegt, so daß sie doch einer erheblichen Verkalkungsgefahr ausgesetzt ist.The disadvantage of this arrangement is that the water jet pump represents an additional pipe constriction, which in the case of low-pressure hot water storage tanks basically becomes undesirable during dispensing Pressure increase inside the device leads. On the other hand, another disadvantage of this arrangement is that the water jet pump is located in the hot water-carrying area, so that it is nevertheless exposed to a considerable risk of calcification.

Die Aufgabe der Erfindung besteht darin, die obengenannten Nachteile zu vermeiden d.h. zu erreichen, daß einerseits die gesamte, einer Warmwasserarmatur entnehmbare Wassermenge über die Wasserstrahlpumpe geführt wird, und dies mit einer Wassertemperatur, bei der Wasser kaum zum Kalkausfall neigt. Zusätzlich soll erreicht werden daß die Kammer nicht druckfest ausgebildet zu sein braucht.The object of the invention is to avoid the disadvantages mentioned above, i.e. to achieve that, on the one hand, the entire amount of water that can be taken from a hot water fitting is passed through the water jet pump, and this with a water temperature at which water hardly tends to precipitate lime. In addition, it should be achieved that the chamber need not be designed to be pressure-resistant.

Dies erreicht die Erfindung dadurch, daß die Wasserstrahlpumpe in einem Rohrabschnitt angeordnet ist, der zwischen dem Zapfventil und dem Mischventil liegt. Weitere vorteilhafte Ausgestaltungen ergeben sich aus den Unteransprüchen.The invention achieves this in that the water jet pump is arranged in a pipe section which lies between the nozzle valve and the mixing valve. Further advantageous embodiments result from the subclaims.

Anhand von vier Figuren soll der Erfindungsgegenstand beispielsweise beschrieben werden. Es zeigen

  • Figur 1 den Aufbau der Verrohrung eines Niederdruck-­Untertisch-Heißwasserspeichers schematisch,
  • Figur 2 einen Querschnitt durch das Innere einer Niederdruck-Mischarmatur,
  • Figur 3 einen Querschnitt eines Teibereichs des Rohrabschnittes einer Niederdruck-Mischarmatur, in dem die Wasserstrahlpumpe angeordnet ist und
  • Figur 4 eine Wasserstrahlpumpe als separat gefertigtes Bauteil.
The subject of the invention is to be described, for example, with reference to four figures. Show it
  • FIG. 1 schematically shows the construction of the piping of a low-pressure under-table hot water tank,
  • FIG. 2 shows a cross section through the interior of a low-pressure mixing valve,
  • 3 shows a cross section of a partial area of the pipe section of a low-pressure mixing valve, in which the water jet pump is arranged, and
  • Figure 4 shows a water jet pump as a separately manufactured component.

In Figur 1 ist einer aus dem Hausversorgungsnetz kommenden Leitung(1) ein Zapfventil(2) nachgeordnet, das über einen Rohrabschnitt(3) mit einem Mischventil(4) in Verbindung steht. Mit dem Mischventil(4) wird mittels einer Kurvenscheibe eingestellt, ob das zufließende Wasser mit seinem Gesamtvolumen der Kaltwasser-Zuflußleitung(5) eines Niederdruck-Warmwasserspeichers(9) zugeführt wird, was einer Temperatur-Einstellung "Heiß" gleichkäme; ob die gesamte zufließende Wassermenge über die Leitung(8) dem Überlauf(7) der Armatur direkt zugeführt wird, was einer Temperatur- Einstellung "Kalt" gleichkäme; oder ob durch eine dazwischenliegende Position erreicht ist, daß eine Teilwassermenge in den Speicher überführt wird, während eine weitere Teilmenge direkt über die Rohrleitung(8) in den Überlauf(7) fließt, was einer Temperatur-Einstellung "Mittel" gleichkäme. In die Kaltwasser-Zuflußleitung(5) eintretendes Kaltwasser verdrängt gleichzeitig Heißwasser aus dem Speicher(9), welches über die Warmwasser-­Rohrleitung(6) in den Überlauf(7) fließt.In Figure 1, a line (1) coming from the house supply network is followed by a nozzle (2) which is connected via a pipe section (3) to a mixing valve (4). With the mixing valve (4) is set by means of a cam, whether the inflowing water with its total volume of the cold water inflow line (5) of a low-pressure hot water tank (9) is fed, which would be equivalent to a temperature setting "hot"; whether the total amount of water flowing in via the line (8) to the overflow (7) of the fitting is fed directly, which would be equivalent to a "cold" temperature setting; or whether it is achieved by an intermediate position that a partial amount of water is transferred to the storage, while another partial amount flows directly via the pipe (8) into the overflow (7), which would be equivalent to a temperature setting "medium". Cold water entering the cold water inflow line (5) simultaneously displaces hot water from the reservoir (9), which flows through the hot water pipe (6) into the overflow (7).

Zwischen Zapfventil (2) und Mischventil(4) ist nun erfindungsgemäß eine Wasserstrahlpumpe(10) angeordnet, die über eine Ansaugleitung(11) mit einer Kammer(12) in Verbindung steht, welche eine Ansaugöffnung(13) aufweist, wobei diese Ansaugöffnung(13) gegen die Umgebung wenigstens dann abgeschlossen ist, wenn das Wasser aus der Kammer(12) abgesaugt ist, und daß der wasseraufnehmende Raum der Kammer(12) gegen die Umgebung wenigstens dann abgeschlossen ist, wenn die Kammer(12) wassergefüllt ist. Die Kammer(12) selbst kann dabei aus einem Faltenbalg einem Schlauch oder einem ballonartigen, elastischen Körper bestehen. Es ist dafür Sorge zu tragen, daß die Kammer(12) so aufgebaut ist, daß sie einerseits dem durch die Wasserstrahlpumpe erzeugten Unterdruck standhält, daß sie andererseits aber auch zumindest dem Druck des sie füllenden Tropfwassers gewachsen ist.Between the nozzle valve (2) and the mixing valve (4), a water jet pump (10) is now arranged according to the invention, which is connected via a suction line (11) to a chamber (12) which has a suction opening (13), this suction opening (13 ) against the environment at least when the water is sucked out of the chamber (12), and that the water-absorbing space of the chamber (12) against the environment is at least closed when the chamber (12) is filled with water. The chamber (12) itself can consist of a bellows, a hose or a balloon-like, elastic body. Care must be taken that the chamber (12) is constructed in such a way that it can withstand the negative pressure generated by the water jet pump and that it can at least withstand the pressure of the dripping water filling it.

In Figur 2 ist eine solche Niederdruck-Mischarmatur(15) gezeigt. Hier ist die vom Hausinstallationsnetz kommende Leitung(1) erkennbar, die an einem Zapfventil(2) endet, von wo aus ein Rohrabschnitt(3) abgeht, der seinerseits in einer Mischkammer(14) endet. Die Mischkammer(14) steht über eine Kurvenscheibe in Verbindung mit einer Leitung(8) und einer weiteren Bohrung, die zur Kaltwasser-­Zuflußleitung(5) führt, die ihrerseits als Zuflußleitung zum Niederdruckspeicher wirkt. Entsprechend der Einstellung der Kurvenscheibe des Mischventils(4) kann nun die gezapfte Wassermenge entweder insgesamt der Leitung(8) oder der zum Niederdruck-Warmwasserspeicher(9) führenden Kaltwasser-Zuflußleitung(5) zugeführt werden, oder es kann der Wasserstrom auf diese beiden Rohrleitungen auch in einem Mischungsverhältnis aufgeteilt werden, so daß am Überlauf(7) Wasser mit einer gewünschten Temperatur ausfließt.Such a low-pressure mixing valve (15) is shown in FIG. Here you can see the line (1) coming from the house installation network, which ends at a nozzle (2), from where a pipe section (3) branches off, which in turn ends in a mixing chamber (14). The mixing chamber (14) is connected via a cam disc to a line (8) and a further bore which leads to the cold water inflow line (5), which in turn acts as an inflow line to the low-pressure accumulator. Depending on the setting of the cam disc of the mixing valve (4), the total amount of water drawn can now either be fed to the line (8) or to the cold water inflow line (5) leading to the low-pressure hot water tank (9), or the water flow to these two pipes can can also be divided in a mixing ratio so that water with a desired temperature flows out at the overflow (7).

Innerhalb der Verbindung zwischen Zapfventil(2) und Mischventil(4) ist - wie oben bereits ausgeführt - ein Rohrabschnitt(3) vorgesehen, der die Wasserstrahlpumpe(10) aufnimmt. Solange der Hahnkörper des Mischventils(4) bzw. der Dichtkörper des Zapfventils(2) noch nicht in die Armatur eingebracht ist, ist der Rohrabschnitt(3) von außen erreichbar, so daß eine zuvor gefertigte Wasserstrahlpumpe in diesen Rohrabschnitt eingebracht und dort fixiert werden kann. Eine solche separat gefertigte Wasserstrahlpumpe ist in Figur 4 dargestellt.As already stated above, a pipe section (3) which receives the water jet pump (10) is provided within the connection between the nozzle valve (2) and the mixing valve (4). As long as the valve body of the mixing valve (4) or the sealing body of the nozzle (2) has not yet been inserted into the valve, the pipe section (3) can be reached from the outside, so that a previously made water jet pump can be inserted into this pipe section and fixed there . Such a separately manufactured water jet pump is shown in FIG. 4.

Wie die Figur 3 erkennen läßt, kann die Wasserstrahlpumpe(10) aber auch während der Herstellung des Rohrabschnittes(3) mitgefertigt werden. Dazu sind zwei Bohrer erforderlich, wobei der eine vorn die Kontur des Einlaufquerschnittes und der andere vorn die Kontur des Auslaufquerschnittes der Wasserstrahlpumpe(10) aufweist. Beide Bohrer bewegen sich bei der Herstellung des Rohrabschnittes(3) und der Wasserstrahlpumpe(10) auf gleicher Ebene aufeinander zu, daß sie sich dort, wo die Ansaugleitung(11) mündet, treffen, und zwar so, daß die Ansaugleitung(11) in einem Bereich der Wasserstrahlpumpe(10) mündet, wo sie beim Durchfluß von Wasser Unterdruck erzeugt.As can be seen in FIG. 3, the water jet pump (10) can also be manufactured during the manufacture of the pipe section (3). This requires two drills, one at the front having the contour of the inlet cross-section and the other at the front having the contour of the outlet cross-section of the water jet pump (10). Both drills move during the manufacture of the Pipe section (3) and the water jet pump (10) on the same level to each other that they meet where the intake pipe (11) opens, in such a way that the intake pipe (11) opens into a region of the water jet pump (10) where it creates negative pressure when water flows through it.

Die Ansaugleitung(11), die eine Verbindung zwischen Wasserstrahlpumpe(10) und Kammer(12) herstellt, ist hier ebenfalls wie die Leitungen(5,6) als Bohrung in den Armaturenkörper eingebracht. An die Ansaugleitung(11) ist die Kammer(12) in in Figur 2 nicht näher dargestellter Weise angeschlossen. Die Kammer(12) ist vorzugsweise in den Totraum hinter einer Spüle bzw. einem Waschbecken, oder hinter den Niederdruck-Warmwasserspeicher(9) verlegt, so daß sie optisch nicht in Erscheinung tritt. Eine möglicherweise defektgegangene Kammer(12) kann dadurch leicht gegen eine neue ausgewechselt werden.The suction line (11), which establishes a connection between the water jet pump (10) and the chamber (12), is also introduced here as a hole in the valve body, like the lines (5, 6). The chamber (12) is connected to the suction line (11) in a manner not shown in FIG. 2. The chamber (12) is preferably installed in the dead space behind a sink or sink, or behind the low-pressure hot water tank (9), so that it does not appear visually. A possibly defective chamber (12) can be easily replaced with a new one.

In die Leitung(8) ist bedarfsweise ein Rückschlagventil(16) eingesetzt. Das Rückschlagventil(16) hat die Aufgabe, daß die Kammer(12) nach einem Zapfvorgang Wasser ausschließlich aus dem Warmwasserspeicher(9) zurücksaugt. Damit ist erreicht, daß auch größere Wassermengen zurückgesaugt werden können, etwa dann, wenn ein größerer Warmwasserspeicher betrieben wird, der zwangsläufig während eines Aufheizvorganges auch mehr Ausdehnungswasser produziert. Mit dieser Maßnahme kann daher nicht nur Wasser aus der Armatur, sondern auch aus dem Warmwasserspeicher unter Absenkung des Wasserspiegels abgesaugt werden. Die Kammer(12) muß in einem solchen Fall unter den Wasserspiegel des Warmwasserbereiters gelegt werden.If necessary, a check valve (16) is inserted into the line (8). The check valve (16) has the task that the chamber (12) sucks back water only from the hot water tank (9) after a tap operation. This ensures that even larger amounts of water can be sucked back, for example when a larger hot water tank is operated, which inevitably produces more expansion water during a heating process. With this measure, not only water can be extracted from the tap, but also from the hot water tank while lowering the water level. In such a case, the chamber (12) must be placed under the water level of the water heater.

Die Wirkungsweise der Vorrichtung ist folgende:
Wird das Zapfventil(2) geöffnet, dann fließt Kaltwasser über den Rohrabschnitt(3) in die Mischkammer(14) des Mischventils(4) und von hier aus entweder in die Kaltwasser-Zuflußleitung(5) bzw. in die Leitung(8) oder aber mit entsprechenden Teilwassermengen in die Rohrleitungen(5,8) gemeinsam. Wasser, das in die Kaltwasser-Zuflußleitung(5) fließt, drückt aus dem Niederdruck-Wasserspeicher(9) Warmwasser über die Warmwasser-Rohrleitung(6) zum Überlauf(7). Der Übergang von der Warmwasser-Rohrleitung(6) zum Überlauf(7) befindet sich in der Armatur nach Fig. 2 hinter dem Rohrabschnitt(3). Dabei saugt die Wasserstrahlpumpe(10) über die Ansaugleitung(11) und die Ansaugöffnung(13) aus der Kammer(12) Wasser heraus und mischt es dem Kaltwasserstrom entsprechend bei.The device works as follows:
If the nozzle valve (2) is opened, then cold water flows through the pipe section (3) into the mixing chamber (14) of the mixing valve (4) and from here either into the cold water inflow line (5) or into line (8) or but together with corresponding partial water quantities in the pipelines (5, 8). Water flowing into the cold water inflow line (5) presses hot water from the low pressure water reservoir (9) via the hot water pipe (6) to the overflow (7). The transition from the hot water pipe (6) to the overflow (7) is in the fitting according to FIG. 2 behind the pipe section (3). The water jet pump (10) sucks water out of the chamber (12) via the suction line (11) and the suction opening (13) and mixes it into the cold water flow accordingly.

Bei einem Niederdruck-Warmwasserspeicher mit einem Wasservolumen von 5 l sollte das Volumen der Kammer(12) so groß sein, daß ca. 3 %, d.h. etwa 150 cm³ Wasser in ihr Platz haben. Bei guter Wirkung der Wasserstrahlpumpe kann diese zu ihrem eigenen Volumenstrom noch ca. 30 % Wasser aus der Kammer(12) dazumischen, so daß in etwa ein durchfließendes Volumen von ca. 450 cm³ notwendig ist, um die Kammer(12) völlig zu entleeren. Dies ist knapp 1/2 l, der praktisch bei jedem Zapfvorgang anfällt. Selbstverständlich wirkt die Einrichtung aber genauso einwandfrei, wenn weniger Wasser gezapft wird, weil dann auch davon auszugehen ist, daß entsprechend weniger Wasser dem Speicher entnommen und damit wieder weniger Wasser nachzuheizen ist.In the case of a low-pressure hot water tank with a water volume of 5 l, the volume of the chamber (12) should be so large that approx. 3%, i.e. have about 150 cm³ of water in their place. If the water jet pump works well, it can add about 30% water from the chamber (12) to its own volume flow, so that a through-flowing volume of approximately 450 cm³ is necessary to completely empty the chamber (12). This is just under 1/2 l, which occurs practically with every tap. Of course, the device works just as well if less water is drawn, because it can also be assumed that correspondingly less water will be removed from the storage tank and thus less water will have to be reheated.

Wird das Zapfventil(2) geschlossen, dann ist die gesamte Vorrichtung vom Netzdruck frei. Es fließt jetzt Wasser aus dem Überlauf(7) und den mit ihm verbundenen Rohrleitungen in die Kammer(12) zurück, so daß dieser nun von Wasser befreite Raum zur Aufnahme von beim Nachheizen entstehenden Tropfwasser zur Verfügung steht.If the nozzle valve (2) is closed, the entire device is free of the network pressure. Water now flows from the overflow (7) and the pipelines connected to it back into the chamber (12), so that this water-free space for receiving during reheating emerging drip water is available.

Ist das Mischventil(4) auf direkten Durchgang zum Niederdruck-Warmwasserspeicher(9) geschaltet, was einer Temperatur-Einstellung "Heiß" entspricht, saugt die Kammer(12) nach abgeschlossenem Zapfvorgang Wasser über die Kaltwasser-Zuflußleitung(5) aus dem Speicher(9) zurück, so daß es auch jetzt zu einem Absenken des Wasserspiegels innerhalb der Armatur bzw. in der mit der Armatur in Verbindung stehenden Verrohrung kommt, wenn nicht sogar zu einem Absenken des Wasserspiegels innerhalb des Speichers selbst. Dies wird von der Größe der Kammer(12) bestimmt.If the mixing valve (4) is switched to direct passage to the low-pressure hot water tank (9), which corresponds to a "hot" temperature setting, the chamber (12) sucks water out of the tank via the cold water supply line (5) after the tap process has been completed 9) back, so that there is now a lowering of the water level inside the fitting or in the piping connected to the fitting, if not a lowering of the water level inside the reservoir itself. This depends on the size of the chamber (12) determined.

In solchen Fällen, wo besonders viel Ausdehnungswasser produziert wird, z.B. bei einem größeren Warmwasserspeicher, ist es notwendig, in die Leitung(8) ein Rückschlagventil(16) einzusetzen. Dadurch wird erreicht, daß die Kammer(12) ausschließlich Wasser aus dem Niederdruck-Warmwasserspeicher(9) zurücksaugt, so daß auch ein Absenken des Wasserspiegels möglich ist. Bei dieser Maßnahme ist darüber hinaus erforderlich, daß die Kurvenscheibe des Mischventils(4) in der Stellung "Kalt" in Richtung zur Kaltwasser-Zuflußleitung(5) einen Restquerschnitt freiläßt, damit ein Zurücksaugen von Wasser auch in den Fällen möglich ist, wenn Kaltwasser unter sonst üblicher Umgehung des Warmwasserspeichers gezapft wird.In cases where a lot of expansion water is produced, e.g. in the case of a larger hot water tank, it is necessary to insert a check valve (16) in the line (8). This ensures that the chamber (12) sucks back only water from the low-pressure hot water tank (9), so that a lowering of the water level is also possible. This measure also requires that the cam plate of the mixing valve (4) in the "cold" position towards the cold water inlet line (5) leaves a residual cross section, so that water can be sucked back even in cases when cold water is below otherwise bypassing the hot water tank is tapped.

In der Beschreibung und in den Ansprüchen ist stets eine Wasserstrahlpumpe ais unterdruck-erzeugendes Element angegeben. Selbstverständlich kann hier auch eine Venturidüse zum Einsatz kommen, die in ihrer Wirkung der Wasserstrahlpumpe gleichzusetzen ist.In the description and in the claims, a water jet pump is always indicated as a vacuum-generating element. Of course, a Venturi nozzle can also be used here, which is equivalent in its effect to the water jet pump.

Claims (5)

1. Vorrichtung bei einem Warmwasserbereiter zum Vermeiden des Tropfens an seinem zur Umgebung offenen Überlauf beim Aufheizen des Wasserspeichers, mit einer Wasserstrahlpumpe im Kaltwasserzulauf des Wasserspeichers, die beim Öffnen des im Wasserweg vor dem Wasserspeicher liegenden Zapfventils Wasser an einer Ansaugöffnung aus einer Kammer absaugt, wobei nach dem Schließen des Zapfventils Wasser über die Ansaugöffnung in die Kammer zurückfließt, die Ansaugöffnung gegen die Umgebung wenigstens dann abgeschlossen ist, wenn das Wasser aus der Kammer gesaugt ist, und der wasseraufnehmende Raum der Kammer gegen die Umgebung wenigstens dann abgeschlossen ist, wenn die Kammer wassergefüllt ist, dadurch gekennzeichnet, daß die Wasserstrahlpumpe (10) im Rohrabschnitt(3) zwischen dem Zapfventil(2) und dem Mischventil (4) einer Niederdruck-Mischarmatur(15) angeordnet ist.1.Device in a water heater to avoid dripping at its overflow, which is open to the environment, when the water reservoir is heated up, with a water jet pump in the cold water inlet of the water reservoir, which sucks water out of a chamber at a suction opening when the nozzle valve lying in front of the water reservoir is opened, whereby after the nozzle has closed, water flows back into the chamber via the suction opening, the suction opening against the environment is closed at least when the water is sucked out of the chamber, and the water-absorbing space of the chamber against the environment is closed at least when the chamber is filled with water, characterized in that the water jet pump (10) is arranged in the pipe section (3) between the nozzle valve (2) and the mixing valve (4) of a low-pressure mixing valve (15). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Wasserstrahlpumpe als integrierter Bestandteil der Armatur(15) ausgebildet ist (Fig. 5).2. Device according to claim 1, characterized in that the water jet pump is designed as an integral part of the fitting (15) (Fig. 5). 3. Wasserstrahlpumpe nach Anspruch 1, dadurch gekennzeichnet, daß sie als separates Bauteil ausgebildet ist.3. Water jet pump according to claim 1, characterized in that it is designed as a separate component. 4. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Ansaugleitung(11) durch den Armaturenkörper geführt ist, wobei die Kammer(12) außerhalb der Armatur, vorzugsweise im Totraum hinter einer Zapfstelle, d.h. einer Küchenspüle oder eines Handwaschbeckens installiert ist.4. Device according to one of the preceding claims, characterized in that the suction line (11) is guided through the valve body, the chamber (12) is installed outside the fitting, preferably in the dead space behind a tap, ie a kitchen sink or a hand basin. 5. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß in der von dem Mischventil(4) zum Überlauf(7) führenden Leitung(8) ein Rückschlagventil(16) angeordnet ist, und daß die Kurvenscheibe des Mischventils(4) so ausgebildet ist, daß in der Stellung "Kalt" in Bezug auf die Leitung(5) ein Restquerschnitt verbleibt, der das Rücksaugen von Wasser aus dem Niederdruck-­Warmwasserspeicher(9) erlaubt.5. The device according to claim 1, characterized in that in the from the mixing valve (4) to the overflow (7) leading line (8) a check valve (16) is arranged, and that the cam plate of the mixing valve (4) is designed so that in the "cold" position with respect to the line (5) there remains a residual cross section which allows water to be sucked back from the low-pressure hot water tank (9).
EP89118532A 1988-10-29 1989-10-05 Device for preventing dripping in a hot water heater Expired - Lifetime EP0366971B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89118532T ATE72893T1 (en) 1988-10-29 1989-10-05 DEVICE ON A WATER HEATER TO PREVENT DRIPPING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3836877 1988-10-29
DE19883836877 DE3836877C1 (en) 1987-07-21 1988-10-29 Device in a water heater for preventing dripping

Publications (2)

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EP0366971A1 true EP0366971A1 (en) 1990-05-09
EP0366971B1 EP0366971B1 (en) 1992-02-26

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ID=6366146

Family Applications (1)

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EP89118532A Expired - Lifetime EP0366971B1 (en) 1988-10-29 1989-10-05 Device for preventing dripping in a hot water heater

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EP (1) EP0366971B1 (en)
AT (1) ATE72893T1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994012738A1 (en) * 1992-12-01 1994-06-09 Ideal-Standard Gmbh Scald-protection device for water-discharge systems with a low-pressure water-storage tank
WO1997005063A1 (en) * 1995-07-28 1997-02-13 Aktiebolaget Electrolux Device and method for re-suction of water from an outlet pipe in connection with an water purifier
CN100419343C (en) * 2004-11-16 2008-09-17 海尔集团公司 Constant temperature water heater

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB526504A (en) * 1939-03-18 1940-09-19 Ferranti Ltd Improvements in or relating to water heaters
DE1275749B (en) * 1961-04-25 1968-08-22 Siemens Elektrogeraete Gmbh Hot water heater

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB526504A (en) * 1939-03-18 1940-09-19 Ferranti Ltd Improvements in or relating to water heaters
DE1275749B (en) * 1961-04-25 1968-08-22 Siemens Elektrogeraete Gmbh Hot water heater

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994012738A1 (en) * 1992-12-01 1994-06-09 Ideal-Standard Gmbh Scald-protection device for water-discharge systems with a low-pressure water-storage tank
DE4396070C1 (en) * 1992-12-01 2003-05-15 Ideal Standard Scalding protection for water extraction systems with low pressure storage
WO1997005063A1 (en) * 1995-07-28 1997-02-13 Aktiebolaget Electrolux Device and method for re-suction of water from an outlet pipe in connection with an water purifier
CN100419343C (en) * 2004-11-16 2008-09-17 海尔集团公司 Constant temperature water heater

Also Published As

Publication number Publication date
ATE72893T1 (en) 1992-03-15
EP0366971B1 (en) 1992-02-26

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