EP0335250A1 - Once through heater, especially for coffee or tea making machines - Google Patents

Once through heater, especially for coffee or tea making machines Download PDF

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Publication number
EP0335250A1
EP0335250A1 EP89105190A EP89105190A EP0335250A1 EP 0335250 A1 EP0335250 A1 EP 0335250A1 EP 89105190 A EP89105190 A EP 89105190A EP 89105190 A EP89105190 A EP 89105190A EP 0335250 A1 EP0335250 A1 EP 0335250A1
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EP
European Patent Office
Prior art keywords
hollow body
heater
water heater
printed
heater according
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
EP89105190A
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German (de)
French (fr)
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EP0335250B1 (en
Inventor
Hans-Jürgen Slomka
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Melitta Haushaltsprodukte GmbH and Co KG
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Melitta Haushaltsprodukte GmbH and Co KG
Melitta Werke Bentz and Sohn KG
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Classifications

    • 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
    • F24H1/121—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 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
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1818—Arrangement or mounting of electric heating means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/013—Heaters using resistive films or coatings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/021—Heaters specially adapted for heating liquids

Definitions

  • the present invention relates to a continuous-flow heater, in particular for a coffee or tea machine, consisting of a hollow body provided with an inlet and an outlet and an electrical resistance heater which completely or partially surrounds the hollow body.
  • Water heaters of the generic type are known in many embodiments.
  • the electrical resistance heating consists of heating wires or flat radiators which are wound around the hollow body or are completely or partially cast into the hollow body.
  • This design principle has a negative influence on the size of the known instantaneous water heaters as well as their design options.
  • the heating wires surrounding the hollow body increase the total volume of previously known instantaneous heaters, the overall dimensions of previously known instantaneous heaters anyway having to be designed to be quite large in order to provide the heating power required in each case.
  • the present invention has for its object to provide a flow heater of the generic type, which is characterized both by small dimensions and in that its shape can be aligned practically without restriction to the particular use or application.
  • the hollow body from an electrically non-conductive Ma material or is provided with a thin insulating layer and the electrical resistance heater consists of an at least in partial areas of the outer surface of the hollow body printed and sintered on resistance paste.
  • the electrical resistance heater is printed and sintered onto the hollow body, on the one hand an increase in volume of the entire instantaneous heater by the resistance heater itself is practically avoided and on the other hand the advantage is achieved that the instantaneous heater can be largely optimally adapted to its respective use, since in its design, it is practically only necessary to ensure that the hollow body can be printed with an appropriate resistance paste.
  • hybrid heating elements The printing of corresponding materials with appropriate resistance pastes and sintering on of these resistance pastes for the purpose of forming heating elements is known per se under the term hybrid heating elements, so far, however, such hybrid heating elements have been produced and used exclusively as contact heating elements which serve to transfer heat to other components to transfer.
  • hybrid heating elements have been produced and used exclusively as contact heating elements which serve to transfer heat to other components to transfer.
  • the use of conventional hybrid heating elements for instantaneous water heaters would not bring any advantage over the known prior art.
  • a tubular flow heater generally designated by the reference numeral 10
  • This water heater 10 consists of a hollow body 11 in the form of a tube and a resistance paste 12 printed and sintered onto this hollow body 11, which serves as an electrical resistance heater.
  • the hollow body 11 is either made of an electrically non-conductive material or consists of an electrically conductive material which is provided with a thin insulating layer.
  • the hollow body 11 consist of steel, and a thin ceramic coating can be provided as the insulating layer.
  • the resistance paste 12 is then printed and sintered onto this ceramic coating.
  • a pipe end 13 is used as an inlet and the one not shown in FIG. 1 re pipe end 14 used as an outlet for the water heater 10.
  • the instantaneous water heater 10 shown in a perspective view in FIG. 2 again consists of a hollow body 11 with an inlet 13 and an outlet 14 as well as a resistance paste 12 printed and sintered onto the hollow body, which forms the electrical resistance heater for the instantaneous heater 10.
  • the hollow body 11 is also made in the exemplary embodiment according to FIG. 2 from an electrically non-conductive material or is provided with an insulating layer.
  • the resistance paste 12 is printed on the respective hollow body 11 in spiral shapes.
  • 3 and 4 show a further embodiment for a tubular instantaneous water heater 10.
  • the central area of the tubular hollow body 11 is flattened in order to create largely flat surfaces for printing with the resistance paste 12.
  • Inlet 13 and outlet 14 of the instantaneous water heater 10 are left cylindrical in order to be able to connect corresponding hose-like connecting parts to the instantaneous water heater 10 without problems.
  • the instantaneous water heater 10 can also be curved in the form of a tube.
  • FIG. 5 in conjunction with FIG. 6 makes it clear that there are various possibilities with regard to the shape of the instantaneous water heater 10 according to the invention.
  • two pipe sections 16, which run parallel to one another and are connected to one another by a central web 15, can be provided with an electrical resistance heater by means of a printed and sintered-on resistor paste 12, and the two pipe sections can be connected to one another via a connecting piece 17.
  • the tube sections 16 are flattened in order to create a surface that is as flat as possible for printing on the resistance paste 12.
  • any curved hollow body 11 can be provided with an electrical resistance heater in the form of a printed and sintered resistance paste 12 in order to create a continuous-flow heater 10.
  • the water heater 10 is to have a hollow body 11 made of electrically non-conductive material, aluminum dioxide is preferably used.

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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)
  • Resistance Heating (AREA)

Abstract

A once-through heater (10), in particular for a coffee or tea making machine, consists of a hollow member (11) which is provided with an inlet (13) and an outlet (14) and to which an electric resistance heating element is applied in the form of a resistor paste (12) printed and sintered onto the hollow member (11). …<??>The advantage of this once-through heater (10) resides on the one hand in the fact that the electric resistance heating element practically does not increase the volume of the once-through heater (10) and on the other hand in the fact that the design of the shape of the once-through heater ultimately only has to consider the possibility that a resistor paste (12) can be printed on and sintered on. …<IMAGE>…

Description

Die vorliegende Erfindung bezieht sich auf einen Durchlauf­erhitzer, insbesondere für eine Kaffee- oder Teemaschine, bestehend aus einem mit einem Einlauf und einem Auslauf versehenen Hohlkörper sowie einer den Hohlkörper ganz oder teilweise umgebenden elektrischen Widerstandsheizung.The present invention relates to a continuous-flow heater, in particular for a coffee or tea machine, consisting of a hollow body provided with an inlet and an outlet and an electrical resistance heater which completely or partially surrounds the hollow body.

Durchlauferhitzer der gattungsgemäßen Art sind in vieler­lei Ausführungsformen bekannt.Water heaters of the generic type are known in many embodiments.

Außer dem Einsatz derartiger Durchlauferhitzer für Kaffee- oder Teemaschinen sind auch andere Anwendungsfälle für Durchlauferhitzer bekannt, wobei das ständig gleiche Funk­tionsprinzip darin zu sehen ist, daß ein zu erwärmendes Medium durch den Einlauf in den Durchlauferhitzer ein­strömt, während des Durchströmens durch den Hohlkörper in diesem erhitzt wird und durch den Auslauf den Durch­lauferhitzer wieder verläßt.In addition to the use of such instantaneous water heaters for coffee or tea machines, other applications for instantaneous water heaters are also known, whereby the same principle of operation is to be seen in the fact that a medium to be heated flows through the inlet into the instantaneous heater, while flowing through the hollow body heats it and leaves the instantaneous water heater again through the outlet.

Bei vorbekannten Durchlauferhitzern besteht die elektri­sche Widerstandsheizung aus Heizdrähten oder Flachheiz­körpern, die um den Hohlkörper herumgewickelt oder ganz bzw. teilweise in den Hohlkörper eingegossen sind.In the case of previously known instantaneous water heaters, the electrical resistance heating consists of heating wires or flat radiators which are wound around the hollow body or are completely or partially cast into the hollow body.

Durch dieses Konstruktionsprinzip wird sowohl die Größe der vorbekannten Durchlauferhitzer negativ beeinflußt wie auch deren Gestaltungsmöglichkeit. Die den Hohlkörper um­gebenden Heizdrähte vergrößern das Gesamtvolumen vorbekann­ter Durchlauferhitzer, wobei die gesamten Abmessungen vor­bekannter Durchlauferhitzer ohnehin recht groß ausgelegt werden müssen, um die jeweils geforderte Heizleistung zu erbringen.This design principle has a negative influence on the size of the known instantaneous water heaters as well as their design options. The heating wires surrounding the hollow body increase the total volume of previously known instantaneous heaters, the overall dimensions of previously known instantaneous heaters anyway having to be designed to be quite large in order to provide the heating power required in each case.

Bei der Formgebung vorbekannter Durchlauferhitzer hat der Konstrukteur immer darauf zu achten, daß die Möglichkeit der Umwicklung oder des Eingießens der Widerstandsdrähte erhalten bleibt, wodurch die Freiheit der Formgestaltung im Sinne einer optimalen Anpassung an den jeweiligen An­wendungszweck beträchtlich eingeschränkt wird.When shaping known instantaneous water heaters, the designer always has to take care that the possibility of wrapping or pouring the resistance wires is preserved, whereby the freedom of shaping in terms of an optimal adaptation to the respective application is considerably restricted.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Durchlauferhitzer der gattungsgemäßen Art zu schaf­fen, der sich sowohl durch geringe Abmessungen wie auch dadurch auszeichnet, daß seine Formgestaltung praktisch uneingeschränkt am jeweiligen Verwendungs- oder Einsatz­zweck ausrichtbar ist.The present invention has for its object to provide a flow heater of the generic type, which is characterized both by small dimensions and in that its shape can be aligned practically without restriction to the particular use or application.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Hohlkörper aus einem elektrisch nicht leitfähigen Ma­ terial besteht oder mit einer dünnen Isolierschicht ver­sehen ist und die elektrische Widerstandsheizung aus einer zumindest in Teilbereichen der Außenfläche des Hohlkörpers auf diesen aufgedruckten und aufgesinterten Widerstands­paste besteht.This object is achieved in that the hollow body from an electrically non-conductive Ma material or is provided with a thin insulating layer and the electrical resistance heater consists of an at least in partial areas of the outer surface of the hollow body printed and sintered on resistance paste.

Bedingt durch die Tatsache, daß die elektrische Wider­standsheizung auf den Hohlkörper aufgedruckt und aufge­sintert ist, wird einerseits eine Volumenvergrößerung des gesamten Durchlauferhitzers durch die Widerstandsheizung selbst praktisch vermieden und andererseits der Vorteil erzielt, daß der Durchlauferhitzer weitestgehend optimal an seinen jeweiligen Verwendungszweck angepaßt werden kann, da bei seiner Formgestaltung praktisch nur darauf zu achten ist, daß die Bedruckung des Hohlkörpers mit einer entsprechenden Widerstandspaste möglich ist.Due to the fact that the electrical resistance heater is printed and sintered onto the hollow body, on the one hand an increase in volume of the entire instantaneous heater by the resistance heater itself is practically avoided and on the other hand the advantage is achieved that the instantaneous heater can be largely optimally adapted to its respective use, since in its design, it is practically only necessary to ensure that the hollow body can be printed with an appropriate resistance paste.

Durch die Verwendung eines elektrisch nicht leitfähigen Materiales oder durch die Verwendung eines elektrisch leitfähigen, aber mit einer dünnen Isolierschicht verse­henen Materiales ist die elektrische Sicherheit eines der­artigen Durchlauferhitzers ohne weiteres gewährleistet.By using an electrically non-conductive material or by using an electrically conductive material but provided with a thin insulating layer, the electrical safety of such a water heater is easily guaranteed.

Die Bedruckung von entsprechenden Materialien mit ent­sprechenden Widerstandspasten und Aufsintern dieser Wi­derstandspasten zum Zwecke der Bildung von Heizelementen ist ansich unter dem Begriff Hybrid-Heizelemente bekannt, bislang werden derartige Hybrid-Heizelemente allerdings ausschließlich als Kontaktheizkörper hergestellt und ver­wendet, die dazu dienen, Wärme auf andere Bauteile zu übertragen. Die Verwendung herkömmlicher Hybrid-Heizele­mente für Durchlauferhitzer würde insoweit gegenüber dem vorbekannten Stand der Technik keinen Vorteil mitsichbrin­gen.The printing of corresponding materials with appropriate resistance pastes and sintering on of these resistance pastes for the purpose of forming heating elements is known per se under the term hybrid heating elements, so far, however, such hybrid heating elements have been produced and used exclusively as contact heating elements which serve to transfer heat to other components to transfer. The use of conventional hybrid heating elements for instantaneous water heaters would not bring any advantage over the known prior art.

Weitere Merkmale der Erfindung sind Gegenstand von Unter­ansprüchen.Further features of the invention are the subject of dependent claims.

In den beigefügten Zeichnungen sind Ausführungsbeispiele der Erfindung dargestellt, die im folgenden näher beschrie­ben werden. Es zeigen:

  • Fig. 1 eine perspektivische Teildarstellung eines rohrförmigen Durchlauferhitzers
  • Fig. 2 eine perspektivische Darstellung eines zy­lindrischen Durchlauferhitzers
  • Fig. 3 eine Ansicht eines rohrförmigen, abeflach­ten Durchlauferhitzers
  • Fig. 4 eine Ansicht in Richtung des Pfeiles IV in Fig. 3
  • Fig. 5 eine Draufsicht auf einen Durchlauferhitzer nach einem weiteren Ausführungsbeispiel der Erfindung
  • Fig. 6 eine Ansicht in Richtung des Pfeiles VI in Fig. 5
  • Fig. 7 eine Draufsicht auf einen Durchlauferhitzer nach einem weiteren Ausführungsbeispiel der Erfindung
  • Fig. 8a bis 8g mögliche Querschnittsformen für erfindungs­gemäße Durchlauferhitzer.
In the accompanying drawings, embodiments of the invention are shown, which are described in more detail below. Show it:
  • Fig. 1 is a partial perspective view of a tubular instantaneous water heater
  • Fig. 2 is a perspective view of a cylindrical instantaneous water heater
  • Fig. 3 is a view of a tubular, flattened water heater
  • 4 is a view in the direction of arrow IV in FIG. 3rd
  • Fig. 5 is a plan view of a water heater according to another embodiment of the invention
  • 6 is a view in the direction of arrow VI in FIG .. 5
  • Fig. 7 is a plan view of a water heater according to another embodiment of the invention
  • 8a to 8g possible cross-sectional shapes for instantaneous water heaters according to the invention.

In Fig. 1 ist in perspektivischer Darstellung ein rohrför­miger, insgesamt mit dem Bezugszeichen 10 versehener Durchlauferhitzer dargestellt. Dieser Durchlauferhitzer 10 besteht aus einem Hohlörper 11 in Form eines Rohres sowie einer auf diesen Hohlkörper 11 aufgedruckten und aufge­sinterten Widerstandspaste 12, die als elektrische Wider­standsheizung dient.In Fig. 1, a tubular flow heater, generally designated by the reference numeral 10, is shown in perspective. This water heater 10 consists of a hollow body 11 in the form of a tube and a resistance paste 12 printed and sintered onto this hollow body 11, which serves as an electrical resistance heater.

Der Hohlkörper 11 ist entweder aus einem elektrisch nicht leitfähigen Material hergestellt oder besteht aus einem elektrisch leitfähigen Material, welches mit einer dünnen Isolierschicht versehen ist.The hollow body 11 is either made of an electrically non-conductive material or consists of an electrically conductive material which is provided with a thin insulating layer.

In letztgenanntem Falle kann z.B. der Hohlkörper 11 aus Stahl bestehen, wobei als Isolierschicht eine dünne Kera­mikbeschichtung vorgesehen sein kann. Auf diese Keramik­beschichtung wird dann die Widerstandspaste 12 aufgedruckt und aufgesintert.In the latter case, e.g. the hollow body 11 consist of steel, and a thin ceramic coating can be provided as the insulating layer. The resistance paste 12 is then printed and sintered onto this ceramic coating.

Bei dem Durchlauferhitzer gemäß Fig. 1 wird ein Rohrende 13 als Einlauf und das in Fig. 1 nicht dargestellte, ande­ re Rohrende 14 als Auslauf für den Durchlauferhitzer 10 benutzt.1, a pipe end 13 is used as an inlet and the one not shown in FIG. 1 re pipe end 14 used as an outlet for the water heater 10.

Der in Fig. 2 in perspektivischer Darstellung gezeigte Durchlauferhitzer 10 besteht wieder aus einem Hohlkörper 11 mit einem Einlauf 13 und einem Auslauf 14 sowie einer auf den Hohlkörper aufgedruckten und aufgesinterten Wider­standspaste 12, welche die elektrische Widerstandsheizung für den Durchlauferhitzer 10 bildet.The instantaneous water heater 10 shown in a perspective view in FIG. 2 again consists of a hollow body 11 with an inlet 13 and an outlet 14 as well as a resistance paste 12 printed and sintered onto the hollow body, which forms the electrical resistance heater for the instantaneous heater 10.

Wie schon beim rohrförmigen Durchlauferhitzer nach Fig. 1 ist der Hohlkörper 11 auch beim Ausführungsbeispiel nach Fig. 2 aus einem elektrisch nicht leitfähigen Material hergestellt oder mit einer Isolierschicht versehen.As in the tubular instantaneous water heater according to FIG. 1, the hollow body 11 is also made in the exemplary embodiment according to FIG. 2 from an electrically non-conductive material or is provided with an insulating layer.

Bei den Ausführungsbeispielen nach den Fig. 1 und 2 ist die Widerstandspaste 12 in umlaufenden Spiralformen auf den jeweiligen Hohlkörper 11 aufgedruckt.In the exemplary embodiments according to FIGS. 1 and 2, the resistance paste 12 is printed on the respective hollow body 11 in spiral shapes.

Die Fig. 3 und 4 zeigen ein weiteres Ausführungsbeispiel für einen rohrförmigen Durchlauferhitzer 10.3 and 4 show a further embodiment for a tubular instantaneous water heater 10.

Hier ist der mittlere Bereich des rohrartigen Hohlkörpers 11 abgeflacht, um weitestgehend ebene Flächen für das Be­drucken mit der Widerstandspaste 12 zu schaffen.Here, the central area of the tubular hollow body 11 is flattened in order to create largely flat surfaces for printing with the resistance paste 12.

Einlauf 13 und Auslauf 14 des Durchlauferhitzers 10 sind hingegen zylindrisch belassen, um entsprechend schlauch­artige Anschlußteile an den Durchlauferhitzer 10 problem­los anschließen zu können.Inlet 13 and outlet 14 of the instantaneous water heater 10, on the other hand, are left cylindrical in order to be able to connect corresponding hose-like connecting parts to the instantaneous water heater 10 without problems.

In Fig. 4 ist schon angedeutet, daß der Durchlauferhitzer 10 in Rohrform auch gekrümmt sein kann.In Fig. 4 it is already indicated that the instantaneous water heater 10 can also be curved in the form of a tube.

Fig. 5 in Verbindung mit Fig. 6 macht deutlich, daß hin­sichtlich der Formgestaltung erfindungsgemäßer Durchlauf­erhitzer 10 vielfältige Möglichkeiten bestehen.FIG. 5 in conjunction with FIG. 6 makes it clear that there are various possibilities with regard to the shape of the instantaneous water heater 10 according to the invention.

So können beispielsweise zwei parallel zueinander verlau­fende, durch einen Mittelsteg 15 miteinander verbundene Rohrabschnitte 16 mit einer elektrischen Widerstandshei­zung durch eine aufgedruckte und aufgesinterte Widerstands­paste 12 versehen und die beiden Rohrabschnitte über ein Verbindungsstück 17 miteinander verbunden sein.For example, two pipe sections 16, which run parallel to one another and are connected to one another by a central web 15, can be provided with an electrical resistance heater by means of a printed and sintered-on resistor paste 12, and the two pipe sections can be connected to one another via a connecting piece 17.

Auch beim Ausführungsbeispiel nach den Fig. 5 und 6 sind die Rohrabschnitte 16 abeflacht, um eine möglichst ebene Fläche für das Aufdrucken der Widerstandspaste 12 zu schaf­fen.5 and 6, the tube sections 16 are flattened in order to create a surface that is as flat as possible for printing on the resistance paste 12.

Das Ausführungsbeispiel gemäß Fig. 7 macht deutlich, daß auch beliebig gekrümmte Hohlkörper 11 mit einer elektri­schen Widerstandsheizung in Form einer aufgedruckten und aufgesinterten Widerstandspaste 12 versehen werden können, um einen Durchlauferhitzer 10 zu schaffen.The embodiment according to FIG. 7 makes it clear that any curved hollow body 11 can be provided with an electrical resistance heater in the form of a printed and sintered resistance paste 12 in order to create a continuous-flow heater 10.

Die Fig. 8a bis 8g machen deutlich, daß letztendlich be­liebige Querschnittsformen von Hohlkörpern 11 verwendet werden können, insbesondere auch solche mit ohnehin ebe­nen Flächen wie quadratische, rechteckige oder mehreckige Profile, weiterhin können auch Mehrkammerprofile (s. Fig. 8g) zum Einsatz kommen.8a to 8g make it clear that ultimately any cross-sectional shapes of hollow bodies 11 can be used, in particular also those with flat surfaces such as square, rectangular or polygonal profiles, and multi-chamber profiles (see FIG. 8g) can also be used.

Die dargestellten Ausführungsbeispiele dienen lediglich dazu, die vielseitigen Gestaltungsmöglichkeiten für erfin­dungsgemäße Durchlauferhitzer anzudeuten.The exemplary embodiments shown serve only to indicate the versatile design options for instantaneous water heaters according to the invention.

Insbesondere bei Durchlauferhitzern für Kaffee- oder Tee­maschinen kommte es häufig darauf an, den Durchlauferhit­zer so zu gestalten, daß dieser sich der äußeren Form der Kaffee- oder Teemaschine optimal unterordnet. Gerade die­ser Forderung kann mit vorliegender Erfindung optimal ent­sprochen werden.Particularly in the case of instantaneous water heaters for coffee or tea machines, it was often important to design the instantaneous water heater in such a way that it optimally subordinates itself to the external shape of the coffee or tea machine. This requirement can be optimally met with the present invention.

Für den Fall, daß der Durchlauferhitzer 10 einen Hohlkör­per 11 aus elektrisch nicht leitfähigem Material aufwei­sen soll, wird bevorzugt Aluminiumdioxyd eingesetzt.In the event that the water heater 10 is to have a hollow body 11 made of electrically non-conductive material, aluminum dioxide is preferably used.

Claims (7)

1. Durchlauferhitzer, insbesondere für eine Kaffee- oder Teemaschine, bestehend aus einem mit einem Einlauf und einem Auslauf versehenen Hohlkörper sowie einer den Hohlkörper ganz oder teilweise umgebenden elek­trischen Widerstandsheizung, dadurch gekennzeichnet, daß der Hohlkörper (11) aus einem elektrisch nicht leitfähigen Material besteht oder mit einer dünnen Isolierschicht versehen ist und die elektrische Widerstandsheizung aus einer zumindest in Teilbereichen der Außenfläche des Hohl­körpers (11) auf diesen aufgedruckten und aufgesinter­ten Widerstandspaste (12) besteht.1. Continuous-flow heater, in particular for a coffee or tea machine, consisting of a hollow body provided with an inlet and an outlet, and an electrical resistance heater which completely or partially surrounds the hollow body, characterized in that the hollow body (11) consists of an electrically non-conductive material or is provided with a thin insulating layer and the electrical resistance heating consists of a resistance paste (12) printed and sintered onto the hollow body (11) at least in partial areas of the outer surface thereof. 2. Durchlauferhitzer nach Anspruch 1, dadurch gekenn­zeichnet, daß der Hohlkörper (11) aus Aluminiumdioxyd hergestellt ist.2. instantaneous water heater according to claim 1, characterized in that the hollow body (11) is made of aluminum oxide. 3. Durchlauferhitzer nach Anspruch 1, dadurch gekenn­zeichnet, daß der Hohlkörper (11) aus Stahl mit einer dünnen Keramikbeschichtung besteht.3. instantaneous water heater according to claim 1, characterized in that the hollow body (11) consists of steel with a thin ceramic coating. 4. Durchlauferhitzer nach einem oder mehreren der An­sprüche 1 bis 3, dadurch gekennzeichnet, daß der Hohl­körper (11) rohrförmig gestaltet und in den Bereichen der aufgedruckten und aufgesinterten Widerstandspaste (12) abgeflacht ist.4. instantaneous water heater according to one or more of claims 1 to 3, characterized in that the hollow body (11) is tubular and is flattened in the areas of the printed and sintered resistance paste (12). 5. Durchlauferhitzer nach einem oder mehreren der An­sprüche 1 bis 3, dadurch gekennzeichnet, daß der Hohl­körper (11) zylindrisch ausgebildet und die aufge­druckte und aufgesinterte Widerstandspaste (12) spi­ralförmig um den zylindrischen Hohlkörper (11) umlau­fend angeordnet ist.5. water heater according to one or more of claims 1 to 3, characterized in that the hollow body (11) is cylindrical and the printed and sintered resistance paste (12) is arranged in a spiral around the cylindrical hollow body (11). 6. Durchlauferhitzer nach einem oder mehreren der An­sprüche 1 bis 4, dadurch gekennzeichnet, daß der Hohl­körper (11) aus zwei über ein Verbindungsstück (17) miteinander verbundenen Rohrstücken (16) besteht.6. instantaneous heater according to one or more of claims 1 to 4, characterized in that the hollow body (11) consists of two pipe pieces (16) connected to one another via a connecting piece (17). 7. Durchlauferhitzer nach einem oder mehreren der vor­hergehenden Ansprüche, dadurch gekennzeichnet, daß Einlauf (13) und Auslauf (14) unabhängig von der Querschnittsform des Hohlkörpers (11) zylindrische Querschnitte aufweisen.7. instantaneous water heater according to one or more of the preceding claims, characterized in that the inlet (13) and outlet (14) independently of the cross-sectional shape of the hollow body (11) have cylindrical cross sections.
EP89105190A 1988-03-30 1989-03-23 Once through heater, especially for coffee or tea making machines Expired - Lifetime EP0335250B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3810736 1988-03-30
DE3810736A DE3810736A1 (en) 1988-03-30 1988-03-30 CONTINUOUS HEATER, ESPECIALLY FOR A COFFEE OR TEA MACHINE

Publications (2)

Publication Number Publication Date
EP0335250A1 true EP0335250A1 (en) 1989-10-04
EP0335250B1 EP0335250B1 (en) 1992-09-23

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EP89105190A Expired - Lifetime EP0335250B1 (en) 1988-03-30 1989-03-23 Once through heater, especially for coffee or tea making machines

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US (1) US5027425A (en)
EP (1) EP0335250B1 (en)
JP (1) JPH0221589A (en)
AU (1) AU3226589A (en)
BR (1) BR8901459A (en)
DE (2) DE3810736A1 (en)
DK (1) DK154989A (en)

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WO2019171310A1 (en) * 2018-03-09 2019-09-12 Formaster S.A. A flow heater for heating fluid and/or for generating steam, and a heater assembly and a flow device for heating fluid and/or for generating steam comprising such a heater
EP3610763B1 (en) 2018-08-16 2021-04-07 CUP&CINO Kaffeesystem-Vertrieb GmbH & Co. KG Coffee machine for preparing a hot drink

Also Published As

Publication number Publication date
AU3226589A (en) 1989-10-05
DE3810736C2 (en) 1990-04-26
JPH0221589A (en) 1990-01-24
DE58902317D1 (en) 1992-10-29
DK154989D0 (en) 1989-03-30
DK154989A (en) 1989-10-01
US5027425A (en) 1991-06-25
DE3810736A1 (en) 1989-10-19
BR8901459A (en) 1989-11-14
EP0335250B1 (en) 1992-09-23

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