EP2428745B1 - Electric heat block and water heating unit - Google Patents

Electric heat block and water heating unit Download PDF

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Publication number
EP2428745B1
EP2428745B1 EP11172648.5A EP11172648A EP2428745B1 EP 2428745 B1 EP2428745 B1 EP 2428745B1 EP 11172648 A EP11172648 A EP 11172648A EP 2428745 B1 EP2428745 B1 EP 2428745B1
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EP
European Patent Office
Prior art keywords
flow
heat block
flow rate
valve
housing
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.)
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EP11172648.5A
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German (de)
French (fr)
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EP2428745A3 (en
EP2428745A2 (en
Inventor
Christian Englisch
Wolfgang Hörner
Gebhard Mayer
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2428745A2 publication Critical patent/EP2428745A2/en
Publication of EP2428745A3 publication Critical patent/EP2428745A3/en
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Publication of EP2428745B1 publication Critical patent/EP2428745B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/14—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
    • F24H1/142—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form using electric energy supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F24H9/2028—Continuous-flow heaters

Definitions

  • the present invention relates to an electric heating block, in particular for a water heater, according to the preamble of claim 1, wherein the heating block is a housing in which a flow channel for defining a heating path for a fluid is formed and in the heating elements for heating the flowing through the flow channel Fluid can be arranged, and a flow-limiting unit for adjusting a flow cross-section has, and a water heater with such a heating block.
  • the heating block is a housing in which a flow channel for defining a heating path for a fluid is formed and in the heating elements for heating the flowing through the flow channel Fluid can be arranged, and a flow-limiting unit for adjusting a flow cross-section has, and a water heater with such a heating block.
  • Modern electrically controlled instantaneous water heaters are able to regulate an outlet temperature to the power limit to the degree.
  • the unit output is often insufficient to reach the set target temperature.
  • so-called fully electronically controlled instantaneous water heaters have been developed, which additionally have an electronically controlled flow limitation unit, with the help of which the electronic control adjusts the flow dynamically, so that the set target temperature is reached even if the user for the required temperature too high Water flow has chosen.
  • Previous flow limitation units are independent assemblies that are subsequently connected to the internal water supply of the heating block. The connection often takes place via sleeve or threaded inserts, which represent in addition to an increased assembly costs and higher costs, in particular potential leaks.
  • G 93 04 262 Another water heater is disclosed in G 93 04 262.
  • an inlet side arranged solenoid valve is provided.
  • the publication DE 10 2004 037966 A1 discloses a water heater with control valve according to the preamble of claim 1. From the DE 42 27 649 A1 is a water heater especially for a shower known.
  • the object of the invention is to provide an electric heating block, in particular for a water heater, which eliminates the aforementioned disadvantages and allows a simple, space-saving and cost-effective positioning of a flow-limiting unit, and to provide a water heater with such a heating block.
  • An inventive electric heating block for a water heater has a housing in which a flow channel for defining a heating path for a fluid is formed and in the heating elements for heating the fluid flowing through the flow channel can be arranged.
  • the heating block has a flow-limiting unit for setting a flow cross-section, which is inventively integrated into the housing and at least partially immersed with a valve body in the flow channel.
  • the integration of the flow-limiting unit according to the invention into the heating block Due to the integration of the flow-limiting unit according to the invention into the heating block, subsequent installation thereof is eliminated, so that the installation effort of the heating block in a water heater is reduced compared to known solutions.
  • no potential weak points such as leaks between the heating block and the flow-limiting unit are formed by the integration, so that the heating block according to the invention is very robust.
  • the flow-limiting unit virtually does not need its own housing and is thus compact enough to carry out that even small-flow water heaters, in which the space is usually very cramped, can be factory-equipped with the integral flow-limiting unit according to the invention.
  • no accessories that are absolutely necessary for operation must be installed. Likewise, necessary settings such as the setting of the
  • the housing of the heating block can be made of plastic. Consequently, the flow restriction unit is integral with the housing of the heating block. i.e. integrated, executed. This means that at least part of the flow restriction unit is integral with the heater block housing. This can be realized for example in an injection molding process, wherein a plastic welding is also used. Therefore, a flow restricting unit made in a quasi integral manner with the heating block can be provided.
  • the flow-limiting unit is inserted into an opening of the housing and positioned in the region of a flow section of the flow channel.
  • the integration of the flow-limiting unit upstream of the heating elements is advantageous in that thus only as much water is supplied to the heating elements, as is necessary for setting the target temperature.
  • the valve body is a valve spool which cooperates with a wall section of the flow area formed as a valve seat.
  • a valve spool can be relatively easily integrated into the housing or the flow area, so that such a solution is particularly inexpensive.
  • the valve seat is integrally formed integrally with the housing, in particular plastic housing, of the heating block. That the housing of the heating block simultaneously serves as the housing of the flow-limiting unit, in which the valve seat is designed directly in an opening of the heating block or of the heating block housing.
  • this head side may have a preferably finger-like or lance-like projection, which dives in sections in a recess introduced into the valve seat.
  • valve spool The adjustment of the valve spool can be done via an electric motor actuator.
  • actuators are relatively robust, small and inexpensive.
  • the valve spool may include a rack-like body portion which is operatively connected to a pinion of the actuator.
  • a gear engagement is very sensitive adjustable, so that the flow cross-section can be set extremely sensitive.
  • relatively few moving components for controlling the valve spool are needed.
  • the flow channel preferably has a reduced flow cross-section compared to adjacent flow sections. As a result, even the smallest adjustment or travel paths of the valve slide are sufficient to change the flow.
  • a strainer is installed in the flow area upstream of the flow-limiting unit or the valve spool.
  • a preferred electric instantaneous water heater is equipped with a heating block according to the invention.
  • Such a flow heater is particularly compact, robust, easy to install and inexpensive.
  • the present invention is particularly suitable for providing an electric heating block for a water heater in the field of home appliance technology, which is compact, robust, easy to install and inexpensive.
  • FIG. 1 shows a simplified longitudinal section through an electric heating block 1 according to the invention for a water heater for heating water.
  • This has a housing 2, in which a meandering flow channel 4 is designed to define a heating section.
  • the heating block 1 is designed in bare-wire technology with a plurality of not shown in the flow channel 4 heating elements for heating the water.
  • the housing 2 has an inlet connection 6 and an outlet connection 8, which are in fluid communication with a heating element-free flow region 10 or a heating element-free trailing region 12 of the flow channel 4.
  • a flow-limiting unit 14 is integrated into the housing 2, the valve slide 18 of which is guided through an opening 16 in the housing 2 into the flow area 10.
  • the valve spool 18 has according to FIG. 2 an extending in the direction of adjustment cylindrical shape with a hemispherical slider head 20 which cooperates with a shell-like valve seat 22 which is formed by a relative to the opening 16 positioned wall portion 24 of the flow area or flow channel 10.
  • the valve spool 18 is guided longitudinally in the opening 16, which is sealed by a sealing ring 26 which is inserted into a circumferential groove 28 of the valve spool 18 and in abutment with an inner wall portion 30 of the opening 16.
  • valve slide 18 In order to prevent the valve slide 18 from being tilted in the opening 16 when there is an axial displacement or that the sealing ring 26 is damaged, the valve slide 18 has a finger 32 on the head side, which dives in sections into a recess 34 formed in the valve seat 22.
  • the wall section 24 is offset radially in the direction of the opening 16 in the region of the flow-limiting unit 14 so that the flow channel 10 immediately upstream and downstream of the valve seat 22 has a flow cross-section A R which reduces compared to the flow cross-section A of adjacent upstream and downstream channel sections 36, 38 is.
  • the recess 34 is formed in this embodiment in a radially outwardly directed projection 40 of the flow channel 10.
  • the opening 16 is formed in a radially outwardly directed projection 42, whereby on the one hand is achieved that the valve spool 18 can completely open the flow channel. On the other hand it is achieved that the flow channel 10 has a constant wall thickness substantially over its entire length.
  • the flow-limiting unit 14 has an electromechanical actuator 44.
  • a servo motor not shown, for example, a stepper motor
  • a foot-side extending in the longitudinal direction tooth-like body portion 48 of the valve spool 18 is in operative engagement.
  • a sieve is arranged upstream of the flow-limiting unit 14 or integrated therein.
  • the actuator 44 When switching on the water heater, the actuator 44 is driven in response to a set temperature by the operator that the valve spool 18 is moved via a rotation of the pinion 46 so that the flow area in the region of the valve seat 22 is increased or decreased.
  • an increase in the flow cross-section means a movement of the valve spool 18 to the left and thus a movement away from the valve seat 22.
  • a Enlargement of the flow cross-section accordingly means a movement of the valve spool 18 to the right and thus a movement in the direction of the valve seat 22nd
  • an electric heating block for a water heater comprising a housing in which a flow channel is formed for defining a heating path for a fluid and in the heating elements for heating the fluid flowing through the flow channel can be arranged, as well as with a flow-limiting unit for adjusting a flow cross-section, wherein the flow-limiting unit is integrated in the housing and with a valve body at least partially immersed in the flow channel.

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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)
  • Multiple-Way Valves (AREA)
  • Details Of Valves (AREA)
  • Temperature-Responsive Valves (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)

Description

Die vorliegende Erfindung betrifft einen elektrischen Heizblock, insbesondere für einen Durchlauferhitzer, nach dem Oberbegriff des Patentanspruchs 1, wobei der Heizblock ein Gehäuse, in dem ein Strömungskanal zur Definierung einer Heizstrecke für ein Fluid ausgebildet ist und in dem Heizelemente zum Erhitzen des durch den Strömungskanal strömenden Fluids anordbar sind, und eine Durchflussbegrenzungseinheit zum Einstellen eines Durchflussquerschnitts hat, sowie einen Durchlauferhitzer mit einem derartigen Heizblock.The present invention relates to an electric heating block, in particular for a water heater, according to the preamble of claim 1, wherein the heating block is a housing in which a flow channel for defining a heating path for a fluid is formed and in the heating elements for heating the flowing through the flow channel Fluid can be arranged, and a flow-limiting unit for adjusting a flow cross-section has, and a water heater with such a heating block.

Moderne elektrisch geregelte Durchlauferhitzer sind in der Lage, eine Auslauftemperatur bis zur Leistungsgrenze gradgenau zu regeln. Bei geringeren Zulauftemperaturen, hohen Solltemperaturen und einem zu hohen Wasserdurchfluss reicht die Geräteleistung häufig jedoch nicht mehr aus, um die eingestellte Solltemperatur zu erreichen. Aus diesem Grund wurden sogenannte vollelektronisch geregelte Durchlauferhitzer entwickelt, die zusätzlich über eine elektronisch ansteuerbare Durchflussbegrenzungseinheit verfügen, mit deren Hilfe die elektronische Regelung den Durchfluss dynamisch anpasst, so dass die eingestellte Solltemperatur auch dann erreicht wird, wenn der Benutzer für die geforderte Temperatur einen zu hohen Wasserdurchfluss gewählt hat. Bisherige Durchflussbegrenzungseinheiten sind eigenständige Baugruppen, die nachträglich mit der internen Wasserführung des Heizblocks verbunden werden. Die Anbindung erfolgt häufig über Muffen- bzw. Gewindeeinsätze, die neben einem erhöhten Montageaufwand und höheren Kosten insbesondere potentielle Leckagen darstellen.Modern electrically controlled instantaneous water heaters are able to regulate an outlet temperature to the power limit to the degree. However, with lower inlet temperatures, high set temperatures and too high a water flow, the unit output is often insufficient to reach the set target temperature. For this reason, so-called fully electronically controlled instantaneous water heaters have been developed, which additionally have an electronically controlled flow limitation unit, with the help of which the electronic control adjusts the flow dynamically, so that the set target temperature is reached even if the user for the required temperature too high Water flow has chosen. Previous flow limitation units are independent assemblies that are subsequently connected to the internal water supply of the heating block. The connection often takes place via sleeve or threaded inserts, which represent in addition to an increased assembly costs and higher costs, in particular potential leaks.

In dem deutschen Gebrauchsmuster DE 299 06 937 U1 ist eine Durchflussbegrenzungseinheit in einen Druckdifferenzschalter eines hydraulisch gesteuerten Durchlauferhitzers integriert. Nachteilig an dieser Lösung ist jedoch die aufwendige und komplizierte Integration der Durchflussbegrenzungseinheit in den Druckdifferenzschalter.In the German utility model DE 299 06 937 U1 For example, a flow restricting unit is integrated with a differential pressure switch of a hydraulically controlled instantaneous water heater. A disadvantage of this solution, however, is the complex and complicated integration of the flow restricting unit in the differential pressure switch.

Ein weiteres Warmwassergerät ist in der G 93 04 262 offenbart. Zur Begrenzung des einströmenden Wassers ist ein einlaufseitig angeordnetes Magnetventil vorgesehen. Die Druckschrift DE 10 2004 037966 A1 offenbart einen Durchlauferhitzer mit Stellventil nach dem Oberbegriff des Anspruchs 1. Aus der DE 42 27 649 A1 ist ein Durchlauferhitzer insbesondere für eine Dusche bekannt.Another water heater is disclosed in G 93 04 262. To limit the inflowing water, an inlet side arranged solenoid valve is provided. The publication DE 10 2004 037966 A1 discloses a water heater with control valve according to the preamble of claim 1. From the DE 42 27 649 A1 is a water heater especially for a shower known.

Aufgabe der Erfindung ist es, einen elektrischen Heizblock, insbesondere für einen Durchlauferhitzer, der die vorgenannten Nachteile beseitigt und eine einfache, platzsparende und kostengünstige Positionierung einer Durchflussbegrenzungseinheit ermöglicht, sowie einen Durchlauferhitzer mit einem derartigen Heizblock zu schaffen.The object of the invention is to provide an electric heating block, in particular for a water heater, which eliminates the aforementioned disadvantages and allows a simple, space-saving and cost-effective positioning of a flow-limiting unit, and to provide a water heater with such a heating block.

Diese Aufgabe wird gelöst durch einen elektrischen Heizblock mit den Merkmalen des Patentanspruchs 1. Ein Durchlauferhitzer mit den Merkmalen des Patentanspruchs 6 und vorteilhafte Aus- und Weiterbildungen, welche einzeln oder in Kombination miteinander ersetzbar sind, sind Gegenstand der jeweils abhängigen Ansprüche.This object is achieved by an electric heating block with the features of claim 1. A water heater having the features of claim 6 and advantageous embodiments and further developments, which are individually or in combination replaceable, are the subject of the respective dependent claims.

Ein erfindungsgemäßer elektrischer Heizblock für einen Durchlauferhitzer hat ein Gehäuse, in dem ein Strömungskanal zur Definierung einer Heizstrecke für ein Fluid ausgebildet ist und in dem Heizelemente zum Erhitzen des durch den Strömungskanal strömenden Fluids anordbar sind. Darüber hinaus weist der Heizblock eine Durchflussbegrenzungseinheit zum Einstellen eines Durchflussquerschnitts auf, die erfindungsgemäß in das Gehäuse integriert ist und mit einem Ventilkörper zumindest abschnittsweise in den Strömungskanal eintaucht.An inventive electric heating block for a water heater has a housing in which a flow channel for defining a heating path for a fluid is formed and in the heating elements for heating the fluid flowing through the flow channel can be arranged. In addition, the heating block has a flow-limiting unit for setting a flow cross-section, which is inventively integrated into the housing and at least partially immersed with a valve body in the flow channel.

Durch die erfindungsgemäße Integration der Durchflussbegrenzungseinheit in den Heizblock entfällt eine nachträgliche Montage derselben, so dass der Installationsaufwand des Heizblocks in einen Durchlauferhitzer gegenüber bekannten Lösungen reduziert ist. Darüber hinaus werden durch die Integration keine potentiellen Schwachstellen wie Leckagen zwischen dem Heizblock und der Durchflussbegrenzungseinheit gebildet, so dass der erfindungsgemäße Heizblock sehr robust ist. Die Durchflussbegrenzungseinheit benötigt quasi kein eigenes Gehäuse und ist somit derart kompakt ausführbar, dass sie selbst Kleindurchlauferhitzer, in denen die Platzverhältnisse üblicherweise sehr beengt sind, mit der erfindungsgemäßen integralen Durchflussbegrenzungseinheit werksseitig ausgerüstet werden können. Zusätzlich muss bei der Inbetriebnahme durch den Handwerker oder den Endkunden kein Zubehör, das zum Betrieb zwingend erforderlich ist, montiert werden. Ebenso können notwendige Einstellungen wie die Einstellung desDue to the integration of the flow-limiting unit according to the invention into the heating block, subsequent installation thereof is eliminated, so that the installation effort of the heating block in a water heater is reduced compared to known solutions. In addition, no potential weak points such as leaks between the heating block and the flow-limiting unit are formed by the integration, so that the heating block according to the invention is very robust. The flow-limiting unit virtually does not need its own housing and is thus compact enough to carry out that even small-flow water heaters, in which the space is usually very cramped, can be factory-equipped with the integral flow-limiting unit according to the invention. In addition, during commissioning by the craftsman or the end customer, no accessories that are absolutely necessary for operation must be installed. Likewise, necessary settings such as the setting of the

Wasserdurchflusses bereits werkseitig vorgenommen werden, so dass diese bei Erstinstallation eines mit einem derartigen Heizblock versehenen Durchlauferhitzers entfallen. Das Gehäuse des Heizblocks kann aus Kunststoff hergestellt werden. Folglich ist die Durchflussbegrenzungseinheit mit dem Gehäuse des Heizblocks integral. d.h. integriert, ausgeführt. Das bedeutet, dass zumindest ein Teil der Durchflussbegrenzungseinheit einstückig mit dem Heizblockgehäuse ist. Dies kann beispielsweise in einem Spritzgussverfahren realisiert werden, wobei auch ein Kunststoffschweißen ebenfalls einsetzbar ist. Daher kann eine quasi einstückig mit dem Heizblock hergestellte Durchflussbegrenzungseinheit bereitgestellt werden.Water flow already made at the factory, so that they account for the first installation of a provided with such a heating block water heater. The housing of the heating block can be made of plastic. Consequently, the flow restriction unit is integral with the housing of the heating block. i.e. integrated, executed. This means that at least part of the flow restriction unit is integral with the heater block housing. This can be realized for example in an injection molding process, wherein a plastic welding is also used. Therefore, a flow restricting unit made in a quasi integral manner with the heating block can be provided.

Erfindungsgemäß die Durchflussbegrenzungseinheit in eine Öffnung des Gehäuses eingesetzt und im Bereich eines Vorlaufabschnitts des Strömungskanals positioniert. Die Integration der Durchflussbegrenzungseinheit stromaufwärts der Heizelemente ist insofern vorteilhaft, als dass somit nur so viel Wasser den Heizelementen zugeführt wird, wie zum Einstellen der Solltemperatur notwendig ist.According to the invention, the flow-limiting unit is inserted into an opening of the housing and positioned in the region of a flow section of the flow channel. The integration of the flow-limiting unit upstream of the heating elements is advantageous in that thus only as much water is supplied to the heating elements, as is necessary for setting the target temperature.

Der Ventilkörper ein Ventilschieber, der mit einem als ein Ventilsitz ausgebildeten Wandungsabschnitt des Vorlaufbereiches zusammenwirkt. Ein Ventilschieber lässt sich verhältnismäßig einfach in das Gehäuse bzw. den Vorlaufbereich integrieren, so dass eine derartige Lösung besonders kostengünstig ist. Der Ventilsitz ist integral mit dem Gehäuse, insbesondere Kunststoffgehäuse, des Heizblocks integral bzw. einstückig hergestellt. D.h. dass das Gehäuse des Heizblocks gleichzeitig als Gehäuse der Durchflussbegrenzungseinheit dient, in dem der Ventilsitz direkt in einer Öffnung des Heizblocks bzw. des Heizblockgehäuse ausgeführt ist.The valve body is a valve spool which cooperates with a wall section of the flow area formed as a valve seat. A valve spool can be relatively easily integrated into the housing or the flow area, so that such a solution is particularly inexpensive. The valve seat is integrally formed integrally with the housing, in particular plastic housing, of the heating block. That the housing of the heating block simultaneously serves as the housing of the flow-limiting unit, in which the valve seat is designed directly in an opening of the heating block or of the heating block housing.

Zur Führung des Ventilschiebers in der Öffnung kann dieser kopfseitig einen bevorzugterweise finger- bzw. lanzenartigen Vorsprung aufweisen, der in eine in den Ventilsitz eingebrachte Vertiefung abschnittsweise eintaucht. Durch die Fingerführung wird der Ventilschieber im Bereich seines Dichtungselementes entlastet, so dass eine derartige Durchflussbegrenzungseinheit eine hohe Standfestigkeit aufweist und wartungsarm ist.To guide the valve spool in the opening, this head side may have a preferably finger-like or lance-like projection, which dives in sections in a recess introduced into the valve seat. By the finger guide the valve spool is relieved in the region of its sealing element, so that such a flow restricting unit has a high stability and low maintenance.

Die Verstellung des Ventilschiebers kann über einen elektromotorischen Stellantrieb erfolgen. Derartige Stellantriebe sind verhältnismäßig robust, klein und kostengünstig.The adjustment of the valve spool can be done via an electric motor actuator. Such actuators are relatively robust, small and inexpensive.

Der Ventilschieber kann einen zahnstangenartigen Körperabschnitt aufweisen, der mit einem Ritzel des Stellantriebs in Wirkverbindung steht. Ein derartiger Getriebeeingriff ist sehr empfindlich einstellbar, so dass der Durchflussquerschnitt äußerst sensibel eingestellt werden kann. Zudem werden verhältnismäßig wenig bewegliche Bauteile zur Ansteuerung des Ventilschiebers benötigt.The valve spool may include a rack-like body portion which is operatively connected to a pinion of the actuator. Such a gear engagement is very sensitive adjustable, so that the flow cross-section can be set extremely sensitive. In addition, relatively few moving components for controlling the valve spool are needed.

Vorzugsweise weist der Vorlaufkanal im Bereich der Durchflussbegrenzungseinheit einen gegenüber benachbarten Vorlaufabschnitten verkleinerten Strömungsquerschnitt auf. Hierdurch genügen bereits kleinste Stell- bzw. Verfahrwege des Ventilschiebers zur Veränderung des Durchflusses.In the region of the flow-limiting unit, the flow channel preferably has a reduced flow cross-section compared to adjacent flow sections. As a result, even the smallest adjustment or travel paths of the valve slide are sufficient to change the flow.

Zur Vermeidung einer Verschmutzung des Ventilschiebers sowie zur Vermeidung einer Beschädigung der Heizelemente ist bei einem Ausführungsbeispiel stromaufwärts der Durchflussbegrenzungseinheit bzw. des Ventilschiebers ein Sieb in den Vorlaufbereich installiert.In order to avoid contamination of the valve spool and to avoid damage to the heating elements, in one exemplary embodiment upstream of the flow-limiting unit or the valve spool, a strainer is installed in the flow area.

Ein bevorzugter elektrischer Durchlauferhitzer ist mit einem erfindungsgemäßen Heizblock ausgerüstet. Ein derartiger Durchlauferhitzer ist insbesondere kompakt, robust, einfach zu installieren und kostengünstig.A preferred electric instantaneous water heater is equipped with a heating block according to the invention. Such a flow heater is particularly compact, robust, easy to install and inexpensive.

Die vorliegende Erfindung eignet sich insbesondere zur Bereitstellung eines elektrischen Heizblockes für einen Durchlauferhitzer im Bereich der Hausgerätetechnik, der kompakt, robust, einfach zu installieren und kostengünstig ist.The present invention is particularly suitable for providing an electric heating block for a water heater in the field of home appliance technology, which is compact, robust, easy to install and inexpensive.

Sonstige vorteilhafte Ausführungsbeispiele der vorliegenden Erfindung sind Gegenstand weiterer Unteransprüche.Other advantageous embodiments of the present invention are the subject of further subclaims.

Im Folgenden wird ein bevorzugtes Ausführungsbeispiel der Erfindung anhand schematischer Darstellungen näher erläutert. Es zeigen:

Figur 1
einen Längsschnitt durch einen erfindungsgemäßen Heizblock,
Figur 2
eine Detaildarstellung einer in Figur 1 gezeigten Durchflussbegrenzungseinheit, und
Figur 3
eine weitere Detaildarstellung der in Figur 1 gezeigten Durchflussbegrenzungseinheit.
In the following, a preferred embodiment of the invention is explained in more detail with reference to schematic representations. Show it:
FIG. 1
a longitudinal section through a heating block according to the invention,
FIG. 2
a detailed representation of an in FIG. 1 shown flow limitation unit, and
FIG. 3
a further detail of the in FIG. 1 shown flow limitation unit.

Figur 1 zeigt einen vereinfachten Längsschnitt durch einen erfindungsgemäßen elektrischen Heizblock 1 für einen Durchlauferhitzer zum Erwärmen von Wasser. Dieser weist ein Gehäuse 2 auf, in dem ein mäanderartiger Strömungskanal 4 zur Definierung einer Heizstrecke ausgebildet ist. Der Heizblock 1 ist in Blankdrahttechnik mit einer Vielzahl von in dem Strömungskanal 4 angeordneten nicht gezeigten Heizelementen zum Erwärmen des Wassers ausgeführt.
Zum Zuführen von zu erwärmendem Wasser und zur Entnahme des erwärmten Wassers weist das Gehäuse 2 einen Einlassstutzen 6 und einen Auslassstutzen 8 auf, die mit einen heizelementenfreien Vorlaufbereich 10 bzw. einen heizelementenfreien Nachlaufbereich 12 des Strömungskanals 4 in Fluidverbindung stehen. Zur Begrenzung der durch den Strömungskanal 4 strömenden Wassermenge bzw. zur Begrenzung der Durchflussmenge ist erfindungsgemäß in das Gehäuse 2 eine Durchflussbegrenzungseinheit 14 integriert, deren Ventilschieber 18 durch eine Öffnung 16 in dem Gehäuse 2 in den Vorlaufbereich 10 geführt ist. FIG. 1 shows a simplified longitudinal section through an electric heating block 1 according to the invention for a water heater for heating water. This has a housing 2, in which a meandering flow channel 4 is designed to define a heating section. The heating block 1 is designed in bare-wire technology with a plurality of not shown in the flow channel 4 heating elements for heating the water.
For supplying water to be heated and for removing the heated water, the housing 2 has an inlet connection 6 and an outlet connection 8, which are in fluid communication with a heating element-free flow region 10 or a heating element-free trailing region 12 of the flow channel 4. In order to limit the amount of water flowing through the flow channel 4 or to limit the flow rate, a flow-limiting unit 14 is integrated into the housing 2, the valve slide 18 of which is guided through an opening 16 in the housing 2 into the flow area 10.

Der Ventilschieber 18 hat gemäß Figur 2 eine sich in Stellrichtung erstreckende zylindrische Gestalt mit einem halbkugelartigen Schieberkopf 20, der mit einem schalenartigen Ventilsitz 22 zusammenwirkt, der von einem gegenüber der Öffnung 16 positionierten Wandungsabschnitt 24 des Vorlaufbereichs bzw. Vorlaufkanals 10 gebildet ist. Der Ventilschieber 18 ist in Längsrichtung in der Öffnung 16 geführt, die über einen Dichtungsring 26 abgedichtet ist, der in eine Umfangsnut 28 des Ventilschiebers 18 eingesetzt ist und sich in Anlage mit einem Innenwandungsabschnitt 30 der Öffnung 16 befindet. Um zu verhindern, dass der Ventilschieber 18 bei einer Axialverschiebung in der Öffnung 16 verkantet bzw. dass der Dichtungsring 26 beschädigt wird, weist der Ventilschieber 18 kopfseitig einen Finger 32 auf, der abschnittsweise in eine in den Ventilsitz 22 ausgebildete Vertiefung 34 eintaucht.The valve spool 18 has according to FIG. 2 an extending in the direction of adjustment cylindrical shape with a hemispherical slider head 20 which cooperates with a shell-like valve seat 22 which is formed by a relative to the opening 16 positioned wall portion 24 of the flow area or flow channel 10. The valve spool 18 is guided longitudinally in the opening 16, which is sealed by a sealing ring 26 which is inserted into a circumferential groove 28 of the valve spool 18 and in abutment with an inner wall portion 30 of the opening 16. In order to prevent the valve slide 18 from being tilted in the opening 16 when there is an axial displacement or that the sealing ring 26 is damaged, the valve slide 18 has a finger 32 on the head side, which dives in sections into a recess 34 formed in the valve seat 22.

Gemäß dem Längsschnitt in Figur 3 ist der Wandungsabschnitt 24 im Bereich der Durchflussbegrenzungseinheit 14 radial in Richtung der Öffnung 16 versetzt, so dass der Vorlaufkanal 10 unmittelbar stromaufwärts und stromabwärts des Ventilsitzes 22 einen Strömungsquerschnitt AR aufweist, der im Vergleich zum Strömungsquerschnitt A benachbarter stromaufwärtiger und stromabwärtiger Kanalabschnitte 36, 38 reduziert ist.According to the longitudinal section in FIG. 3 the wall section 24 is offset radially in the direction of the opening 16 in the region of the flow-limiting unit 14 so that the flow channel 10 immediately upstream and downstream of the valve seat 22 has a flow cross-section A R which reduces compared to the flow cross-section A of adjacent upstream and downstream channel sections 36, 38 is.

Wie in Figur 3 ebenfalls gezeigt, ist die Vertiefung 34 bei diesem Ausführungsbeispiel in einem radial nach außen gerichteten Vorsprung 40 des Vorlaufkanals 10 ausgebildet. Ebenso ist die Öffnung 16 in einem radial nach außen gerichteten Vorsprung 42 ausgebildet, wodurch zum einen erreicht wird, dass der Ventilschieber 18 den Vorlaufkanal vollständig aufsteuern kann. Zum anderen wird erreicht, dass der Vorlaufkanal 10 im Wesentlichen über seine gesamte Länge eine konstante Wandstärke aufweist.
Zur axialen Verschiebung des Ventilschiebers 18 in der Öffnung 16 weist die Durchflussbegrenzungseinheit 14 einen elektromechanischen Stellantrieb 44 auf. Dieser hat ein Ritzel 46, das auf einer Antriebswelle eines nicht gezeigten Stellmotors, beispielsweise ein Schrittmotor, befestigt ist und mit einem fußseitigen sich in Längsrichtung erstreckenden zahnartigen Körperabschnitt 48 des Ventilschiebers 18 in Wirkeingriff steht. Um zu verhindern, dass der Ventilschieber 18 auf den Ventilsitz 22 aufläuft und somit der Vorlaufkanal 10 vollständig zugesteuert wird, ist ein nicht dargestellter stellantriebseitiger Anschlag vorgesehen.As in FIG. 3 also shown, the recess 34 is formed in this embodiment in a radially outwardly directed projection 40 of the flow channel 10. Likewise, the opening 16 is formed in a radially outwardly directed projection 42, whereby on the one hand is achieved that the valve spool 18 can completely open the flow channel. On the other hand it is achieved that the flow channel 10 has a constant wall thickness substantially over its entire length.
For the axial displacement of the valve spool 18 in the opening 16, the flow-limiting unit 14 has an electromechanical actuator 44. This has a pinion 46 which is mounted on a drive shaft of a servo motor, not shown, for example, a stepper motor, and with a foot-side extending in the longitudinal direction tooth-like body portion 48 of the valve spool 18 is in operative engagement. In order to prevent the valve spool 18 runs on the valve seat 22 and thus the flow channel 10 is fully zugesteuert, an unillustrated actuator-side stop is provided.

Um eine Verschmutzung des Ventilschiebers 18, des Ventilsitzes 22 oder der Heizelemente zu verhindern, ist stromaufwärts der Durchflussbegrenzungseinheit 14 bzw. in diese integriert ein nicht gezeigtes Sieb angeordnet.In order to prevent contamination of the valve spool 18, the valve seat 22 or the heating elements, a sieve, not shown, is arranged upstream of the flow-limiting unit 14 or integrated therein.

Beim Einschalten des Durchlauferhitzers wird der Stellantrieb 44 derart in Abhängigkeit einer vom Bediener eingestellten Solltemperatur angesteuert, dass über eine Rotation des Ritzels 46 der Ventilschieber 18 so verfahren wird, dass der Durchflussquerschnitt im Bereich des Ventilsitzes 22 vergrößert oder verkleinert wird. Gemäß der Darstellung in Figur 3 bedeutet eine Vergrößerung des Durchflussquerschnittes eine Bewegung des Ventilschiebers 18 nach links und somit eine Bewegung weg vom Ventilsitz 22. Eine Vergrößerung des Durchflussquerschnittes bedeutet demgemäß eine Bewegung des Ventilschiebers 18 nach rechts und somit eine Bewegung in Richtung des Ventilsitzes 22.When switching on the water heater, the actuator 44 is driven in response to a set temperature by the operator that the valve spool 18 is moved via a rotation of the pinion 46 so that the flow area in the region of the valve seat 22 is increased or decreased. As shown in FIG. 3 an increase in the flow cross-section means a movement of the valve spool 18 to the left and thus a movement away from the valve seat 22. A Enlargement of the flow cross-section accordingly means a movement of the valve spool 18 to the right and thus a movement in the direction of the valve seat 22nd

Offenbart ist ein elektrischer Heizblock für einen Durchlauferhitzer, mit einem Gehäuse, in dem ein Strömungskanal zur Definierung einer Heizstrecke für ein Fluid ausgebildet ist und in dem Heizelemente zum Erhitzen des durch den Strömungskanal strömenden Fluids anordbar sind, sowie mit einer Durchflussbegrenzungseinheit zum Einstellen eines Durchflussquerschnitts, wobei die Durchflussbegrenzungseinheit in das Gehäuse integriert ist und mit einem Ventilkörper zumindest abschnittsweise in den Strömungskanal eintaucht.Disclosed is an electric heating block for a water heater, comprising a housing in which a flow channel is formed for defining a heating path for a fluid and in the heating elements for heating the fluid flowing through the flow channel can be arranged, as well as with a flow-limiting unit for adjusting a flow cross-section, wherein the flow-limiting unit is integrated in the housing and with a valve body at least partially immersed in the flow channel.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Heizblockheating block
22
Gehäusecasing
44
Strömungskanalflow channel
66
Einlassstutzeninlet port
88th
Auslassstutzenoutlet
1010
Vorlaufbereichleading area
1212
Nachlaufbereichrunning area
1414
DurchflussbegrenzungseinheitFlow limiter
1616
Öffnungopening
1818
Ventilschiebervalve slide
2020
Schieberkopfslide head
2222
Ventilsitzvalve seat
2424
Wandungsabschnittwall section
2626
Dichtungsringsealing ring
2828
Umfangsnutcircumferential groove
3030
InnenwandungsabschnittInnenwandungsabschnitt
3232
Fingerfinger
3434
Vertiefungdeepening
3636
benachbarter Kanalabschnittadjacent channel section
3838
benachbarter Kanalabschnittadjacent channel section
4040
Vorsprunghead Start
4242
Vorsprunghead Start
4444
Stellantriebactuator
4646
Ritzelpinion
4848
Körperabschnittbody part
ArAr
reduzierter Strömungsquerschnittreduced flow cross-section
AA
normaler Strömungsquerschnittnormal flow cross section

Claims (6)

  1. Electric heat block (1) for a continuous flow heater, with a housing (2), in which a flow channel (4) for defining a heat path for a fluid is embodied and in which heating elements for heating the fluid flowing through the flow channel (4) can be arranged, as well as with a flow rate restricting unit (14) for setting a flow rate profile, characterised in that the flow rate restricting unit (14) is integrated into the housing (2) and immerses into the flow channel (4) with a valve body (18) at least in sections,
    wherein the flow rate restricting unit (14) is introduced into an opening (16) of the housing (2) and is arranged in the region of a lead section (10) of the flow channel (4), wherein the valve body (18) is a valve slide, which interacts with a wall section (24) of the lead region (10) embodied as a valve seat (22), and
    wherein the valve slide (18) has a protrusion (32) on its head side for axial guidance, which immerses at least in sections into a recess (34) introduced into the valve seat (22).
  2. Heat block according to claim 1, wherein there is provision for an electromotive actuating drive (44) for displacing the valve slide (18).
  3. Heat block according to claim 2, wherein the valve slide (18) has a toothed rack-like body section (48), which has an operative connection with a pinion (44) of the actuating drive (44).
  4. Heat block according to one of the preceding claims, wherein the lead region (10) has a reduced flow rate profile (AR) with respect to adjacent lead regions (36, 38) in the region of the flow rate restricting unit (14).
  5. Heat block according to one of the preceding claims, wherein a filter is installed in the lead region (10) upstream of the flow rate restricting unit (14).
  6. Electric continuous flow heater with a heat block (1) according to one of the preceding claims.
EP11172648.5A 2010-07-19 2011-07-05 Electric heat block and water heating unit Not-in-force EP2428745B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010031521A DE102010031521A1 (en) 2010-07-19 2010-07-19 Electric heating block and water heater

Publications (3)

Publication Number Publication Date
EP2428745A2 EP2428745A2 (en) 2012-03-14
EP2428745A3 EP2428745A3 (en) 2014-01-22
EP2428745B1 true EP2428745B1 (en) 2016-09-07

Family

ID=44508767

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11172648.5A Not-in-force EP2428745B1 (en) 2010-07-19 2011-07-05 Electric heat block and water heating unit

Country Status (4)

Country Link
EP (1) EP2428745B1 (en)
DE (1) DE102010031521A1 (en)
PL (1) PL2428745T3 (en)
RU (1) RU2494318C2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018001315B4 (en) * 2018-02-20 2023-12-07 Stiebel Eltron Gmbh & Co. Kg Switch-on value reduction depending on the setpoint

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004037966A1 (en) * 2004-08-05 2006-03-16 Stiebel Eltron Gmbh & Co. Kg Instantaneous water heater, has control valve for controlling amount of water flowing through heating block, where control valve is integrated within heating block and includes valve body in valve seat and drive unit for valve body
EP2075513A2 (en) * 2007-12-28 2009-07-01 BSH Bosch und Siemens Hausgeräte GmbH Heat block for a warm water device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2042892C1 (en) * 1991-10-04 1995-08-27 Николай Николаевич Леухин High-pressure through-flow water heater
DE4227649C2 (en) * 1992-08-21 2000-12-21 Stiebel Eltron Gmbh & Co Kg Instantaneous water heater, especially for a shower
DE9304262U1 (en) * 1993-03-22 1993-06-17 Eckerfeld, Erika, 5628 Heiligenhaus, De
DE19501203C2 (en) * 1995-01-17 1998-01-15 Stiebel Eltron Gmbh & Co Kg Control device in the water flow of a water heater
RU2105433C1 (en) * 1996-01-03 1998-02-20 Акционерное общество открытого типа "СЭВ" Electric water heater
DE29906937U1 (en) 1999-04-17 2000-08-31 Forbach Gmbh Differential pressure switch for switching on the heating power of hydraulically controlled instantaneous heat
GB2390135A (en) * 2002-06-24 2003-12-31 Aqualisa Products Ltd Water flow control device
DE10312724B4 (en) * 2003-03-21 2011-02-24 BSH Bosch und Siemens Hausgeräte GmbH Heater
DE102008013946B3 (en) * 2008-03-12 2009-07-16 Stiebel Eltron Gmbh & Co. Kg Method for controlling an electric instantaneous water heater

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004037966A1 (en) * 2004-08-05 2006-03-16 Stiebel Eltron Gmbh & Co. Kg Instantaneous water heater, has control valve for controlling amount of water flowing through heating block, where control valve is integrated within heating block and includes valve body in valve seat and drive unit for valve body
EP2075513A2 (en) * 2007-12-28 2009-07-01 BSH Bosch und Siemens Hausgeräte GmbH Heat block for a warm water device

Also Published As

Publication number Publication date
EP2428745A3 (en) 2014-01-22
RU2494318C2 (en) 2013-09-27
EP2428745A2 (en) 2012-03-14
RU2011129074A (en) 2013-01-20
DE102010031521A1 (en) 2012-01-19
PL2428745T3 (en) 2017-02-28

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