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EP0185874A1 - Flow heater - Google Patents

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Publication number
EP0185874A1
EP0185874A1 EP85113249A EP85113249A EP0185874A1 EP 0185874 A1 EP0185874 A1 EP 0185874A1 EP 85113249 A EP85113249 A EP 85113249A EP 85113249 A EP85113249 A EP 85113249A EP 0185874 A1 EP0185874 A1 EP 0185874A1
Authority
EP
European Patent Office
Prior art keywords
tube
water heater
pipe
stainless steel
metal tube
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
EP85113249A
Other languages
German (de)
French (fr)
Other versions
EP0185874B1 (en
Inventor
Ingo Dipl.-Ing. Dr. Mont. Bleckmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ELPAG AG CHUR
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ELPAG AG CHUR
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6773885&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0185874(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by ELPAG AG CHUR filed Critical ELPAG AG CHUR
Priority to AT85113249T priority Critical patent/ATE49865T1/en
Publication of EP0185874A1 publication Critical patent/EP0185874A1/en
Application granted granted Critical
Publication of EP0185874B1 publication Critical patent/EP0185874B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F24H1/14—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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4285—Water-heater arrangements

Definitions

  • the invention relates to a water heater for dishwashers, washing machines or other electrically operated domestic appliances with hot water preparation.
  • the known flow heaters have the disadvantage that constituents contained in the water flow, for example food residues, washing powder, etc., settle on the heated tubular heater and burn in there. This leads to taste and smell nuisance, especially in dishwashers, apart from hygienic concerns. If, for example, a dishwasher of the type in question is not operated for a few weeks, then the settled food remnants start to form mold. In addition, such deposits on the tubular heating element cause this to overheat locally, since the heat dissipation is impaired.
  • the invention is based on the object of designing a continuous-flow heater of the type in question in such a way that the heat transfer from the tubular heating element to the inner jacket of the flow tube is improved in the sense of a more uniform heat distribution on the inner jacket of the tube, so that deposits are avoided.
  • a good heat-conducting metal pipe 2 which consists in particular of copper or aluminum and which carries a soldered tubular heating element 3, is pushed on. The arrangement is then thorned or expanded from the inside out. Instead of flaring, the steel tube 1 can also be soldered together with the rivet tube 2 in a single operation, with a good heat-conducting connection.
  • the rustproof tube can be cast in die-cast metal tube 2 carrying the tubular heating element 3.
  • stainless steel pipes have many advantages for the purposes in Reae, but the considerable disadvantage of e.g. Thermal conductivity is significantly poorer than that of copper or aluminum.
  • the arrangement of the metal tube 2 made of a material that is a good conductor of heat achieves a uniform heat distribution and in this way prevents food residues or dirt from caking on the inner jacket of the steel tube 1. It is particularly important, however, that stress corrosion cracking is prevented by the uniform heat distribution.

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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)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)

Abstract

1. An electrical continuous flow heater for dishwashing machines, washing machines or other electrically operated domestic appliances which involve the production of hot water, wherein a pipe (1) through which flows the liquid to be heated is heated from the outside by at least one tubular heater member (3), characterised by the combination of the following features : a) The pipe (1) through which the liquid flows comprises stainless steel. b) Soldered onto the pipe (1) of stainless teel is a metal pipe of copper, aluminium or a suitable Cu or Al alloy. c) The metal pipe (2) carries a helical tubular heater member soldered thereon.

Description

Die Erfindung betrifft einen Durchlauferhitzer für Geschirrspülmaschinen, Waschmaschinen oder andere elektrisch betriebene Haushalsgeräte mit Warmwasserbereitung.The invention relates to a water heater for dishwashers, washing machines or other electrically operated domestic appliances with hot water preparation.

Aus der DE-OS 24 40 42b ist ein elektrischer Durchlauferhitzer bekannt geworden, bei dem das Durchflußrohr den Rohrheizkörper oder die Rohrheizkörper konzentrisch umgibt.From DE-OS 24 40 42b an electric instantaneous water heater has become known in which the flow tube concentrically surrounds the tubular heating element or the tubular heating element.

Aus der US-PS 31 30 737 ist eine Geschirrspülmaschine bekannt geworden, bei der ebenfalls ein elektrischer Heizwiderstand in dem Luftstrom angeordnet ist.From US-PS 31 30 737 a dishwasher has become known in which an electrical heating resistor is also arranged in the air flow.

Die bekannten Durchflußerhitzer haben den Nachteil, daß im Wasserstrom enthaltene Bestandteile, z.B. Speisereste, Waschpulver usw. sich an dem erhitzten Rohrheizkörper absetzen und dort einbrennen. Dies führt insbesondere bei Geschirrspülmaschinen zu Geschmacks- und Geruchsbelästigungen, abgesehen von hygienischen Bedenken. Wird beispielsweise eine Geschirrspülmaschine der in Rede stehenden Art über einige Wochen hinweg nicht betrieben, dann fangen die abgesetzten Speisereste an, Schimmel zu bilden. Darüber hinaus wird durch derartige Ablagerungen am Rohrheizkörper dieser örtlich überhitzt, da ja die Wärmeabgabe beeinträchtigt wird.The known flow heaters have the disadvantage that constituents contained in the water flow, for example food residues, washing powder, etc., settle on the heated tubular heater and burn in there. This leads to taste and smell nuisance, especially in dishwashers, apart from hygienic concerns. If, for example, a dishwasher of the type in question is not operated for a few weeks, then the settled food remnants start to form mold. In addition, such deposits on the tubular heating element cause this to overheat locally, since the heat dissipation is impaired.

Es sind dementsprechend, wie dies z.b. die DE-OS 33 07 9b2 oder die US-PS 4 326 552 zeigen, elektrische Durchlauferhitzer für Getränkebereiter bzw. für Geschirrspülmaschinen entwickelt worden, bei denen ein Rohrheizkörper wendelförmig um ein Rohr gewickelt ist, durch welches der Flüssigkeitsstrom geleitet wird. Durch diese Durchlauferhitzer wird zwar die Problemstellung verbessert, jedoch noch nicht vollständig gelöst. Durch die direkte Wärmeübertragung vom Rohrheizkörper auf die Innenrnantelflache des Rohres entstehen dort Zonen mit höherer Temperatur und solcehe mit niedriger Temperatur, wobei wiederum an den Zonen mit höheren Temperaturen die entsprechenden Ablagerungen auftreten.Accordingly, as is shown, for example, by DE-OS 33 07 9 b 2 or US Pat. No. 4,326,552, electric instantaneous water heaters for beverage makers or for dishwashers have been developed in which a tubular heating element is wound helically around a tube through which the liquid flow is directed. These water heaters improve the problem, but they have not yet been completely solved. Due to the direct heat transfer from the tubular heating element to the inner jacket surface of the tube, zones with a higher temperature and solcehe with a lower temperature are formed, with the corresponding deposits occurring in the zones with higher temperatures.

Der Erfindung liegt nun die Aufgabe zugrunde, einen Durchlauferhitzer der in Rede stehenden At so auszubilden, daß die Wärmeübertragung vom Rohrheizkörper auf den Innenmantel des Durchflußrohres im Sinne einer gleichmäßigeren wärmeverteilung am Rohr innenmantel verbessert wird, so daß Ablagerungen vermieden werden.The invention is based on the object of designing a continuous-flow heater of the type in question in such a way that the heat transfer from the tubular heating element to the inner jacket of the flow tube is improved in the sense of a more uniform heat distribution on the inner jacket of the tube, so that deposits are avoided.

Die Lösung der gestellten Aufgabe ergibt sich aus den kennzeichnenden Merkmalen des Hauptanspruches. Die Unteransprüche betreffen bevorzugte Ausführungsforrnen.The solution to the problem arises from the characterizing features of the main claim. The subclaims relate to preferred embodiments.

Auf der Zeichnung ist eine bevorzugte Ausführungsform des Gegenstandes der Erfindung dargestellt. Es zeigen:

  • Fig. 1 einen Schnitt durch den unteren Teil einer Geschirrspülmaschine;
  • Fig. 2 in vergrößertem Maßstab eine teilweise geschnittene Ansicht des Durchlauferhitzers.
In the drawing, a preferred embodiment of the object of the invention is shown. Show it:
  • 1 shows a section through the lower part of a dishwasher.
  • Fig. 2 in an enlarged scale, a partially sectioned view of the water heater.

Auf ein rostfreies Stahlrohr 1, z.B. aus Chromnickelstahl, wird ein gut wärmeleitendes Metallrohr 2, das insbesondere aus Kupfer oder Aluminium besteht und das einen aufgelöteten Rohrheizkörper 3 trägt, aufgeschoben. Anschließend wird die Anordnung von innen nach außen aufgedornt bzw. expandiert. Anstelle des Aufdornens kann das Stahlrohr 1 auch mit dem Nietallrohr 2 in einem einzigen Arbeitsgang gemeinsam verlötet werden, wobei eine gut wärmeleitende Verbindung erfolgt.On a stainless steel pipe 1, e.g. made of chromium-nickel steel, a good heat-conducting metal pipe 2, which consists in particular of copper or aluminum and which carries a soldered tubular heating element 3, is pushed on. The arrangement is then thorned or expanded from the inside out. Instead of flaring, the steel tube 1 can also be soldered together with the rivet tube 2 in a single operation, with a good heat-conducting connection.

Als weitere Alternative kann das rostfreie Rohr in Druckguß in das den Rohrheizkörper 3 tragende Metallrohr 2 eingegossen werden.As a further alternative, the rustproof tube can be cast in die-cast metal tube 2 carrying the tubular heating element 3.

Rostfreie Stahlrohre haben, wie bekannt, für die in Reae stehenden Zwecke viele Vorteile, jedoch den erheblichen Nachteil der z.B. gegenüber Kupfer oder Aluminium wesentlich schlechteren Wärmeleitfähigkeit. Durch die Anordnung des Metallrohres 2 aus gut wärmeleitendem Material wird eine gleichmäßige Wärmeverteilung erzielt und auf diese Weise das Anbacken von Speiseresten oder Verschmutzungen am Innenmantel des Stahlrohres 1 verhindert. Besonders wesentlich ist jedoch, daß durch die gleichmäßige Wärmeverteilung auch eine Spannungsrißkorrosion unterbunden wird.As is known, stainless steel pipes have many advantages for the purposes in Reae, but the considerable disadvantage of e.g. Thermal conductivity is significantly poorer than that of copper or aluminum. The arrangement of the metal tube 2 made of a material that is a good conductor of heat achieves a uniform heat distribution and in this way prevents food residues or dirt from caking on the inner jacket of the steel tube 1. It is particularly important, however, that stress corrosion cracking is prevented by the uniform heat distribution.

Bei richtiger Auslegung der Oberflächenbelastung, wobei ein kritischer Wert, der sich nach dem Verschmutzungsgrad des Wassers richtet, nicht überschritten werden darf, bildet sich überhaupt kein Belag mehr am Innenmantel des Rohres 1 aus rostfreiem Stahl. Damit zeigt sich, daß ein bisher bei Geschirrspülmaschinen für unvermeidlich gehaltenes Problem durch die neu vorgeschlagene Anordnung gelöst werden kann. Der Durchlauferhitzer eignet sich selbstverständlich auch für was chma schinen und für die warmwasserbereitung, wobei sich im letzteren Fall der Vorteil eines wesentlich geringeren Kalkansatzes am Innenmantel des Rohres 1 aus rostfreiem Stahl ergibt.With a correct design of the surface load, whereby a critical value which depends on the degree of pollution of the water must not be exceeded, no coating at all on the inner jacket of the tube 1 made of stainless steel. This shows that a problem previously considered inevitable in dishwashers can be solved by the newly proposed arrangement. The instantaneous water heater is suitable of course also for what chma machines and for the hot water preparation, in the latter case there is the advantage of a much lower lime deposit on the inner jacket of the tube 1 made of stainless steel.

Claims (5)

1. Elektrischer Durchlauferhitzer für Geschirrspülmaschinen, Waschmaschinen oder andere elektrisch betriebene Haushaltsmaschinen mit Warmwasserbereitung, bei dem ein von der zu erwärmenden Flüssigkeit durchströmtes Rohr (1) von außen her von mindestens einem Rohrheizkörper (3) beheizt wird, dadurch gekennzeichnet, daß das von der Flüssigkeit durchströmte Rohr (1) aus rostfreiem Stahl besteht und daß auf das Rohr (1) ein Metallrohr (2) aus gut wärmeleitendem Material aufgeschoben ist, welches mindestens einen Rohrheizkörper (3) trägt.1. Electric instantaneous water heater for dishwashers, washing machines or other electrically operated domestic machines with hot water preparation, in which a tube through which the liquid to be heated flows (1) is heated from the outside by at least one tubular heater (3), characterized in that the liquid flowed through tube (1) made of stainless steel and that a metal tube (2) of good heat-conducting material is pushed onto the tube (1), which carries at least one tubular heater (3). 2. Durchlauferhitzer nach Anspruch 1, dadurch gekennzeichnet, daß der Außenmantel des Rohres (1) durch Aufdornen oder Expandieren an den Innenmantel des Metallrohres (2) aus gut wärmeleitendem Material angepreßt ist.2. instantaneous water heater according to claim 1, characterized in that the outer jacket of the tube (1) by pressing or expanding on the inner jacket of the metal tube (2) is pressed from a good heat-conducting material. 3. Durchlauferhitzer nach Anspruch 1, dadurch gekennzeichnet, daß das rohr (1) aus rostfreiem Stahl mit dem Metallrohr (2) aus gut wärmeleitendem Material verlötet ist.3. instantaneous water heater according to claim 1, characterized in that the tube (1) made of stainless steel is soldered to the metal tube (2) made of a good heat-conducting material. 4. Durchlauferhitzer nach Anspruch 1, dadurch gekennzeichnet, daß das Rohr (1) aus rostfreiem Stahl in Druckguß in das Metallrohr (2) eingegossen ist.4. instantaneous water heater according to claim 1, characterized in that the tube (1) made of stainless steel is die-cast in the metal tube (2). 5. Durchlauferhitzer nach einem der Ansprüche 1 bis 4, ladurch gekennzeichnet, daß das Metallrohr (2) aus Kupfer, sluminium oder einer entsprechenden Cu- bzw. AI-Legierung sesteht.5. water heater according to one of claims 1 to 4, characterized in that the metal tube (2) made of copper, aluminum or a corresponding Cu or Al alloy.
EP85113249A 1984-12-18 1985-10-18 Flow heater Expired - Lifetime EP0185874B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85113249T ATE49865T1 (en) 1984-12-18 1985-10-18 INSTANTANEOUS HEATER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8437042U 1984-12-18
DE8437042 1984-12-18

Publications (2)

Publication Number Publication Date
EP0185874A1 true EP0185874A1 (en) 1986-07-02
EP0185874B1 EP0185874B1 (en) 1990-01-31

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ID=6773885

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EP85113249A Expired - Lifetime EP0185874B1 (en) 1984-12-18 1985-10-18 Flow heater

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EP (1) EP0185874B1 (en)
AT (1) ATE49865T1 (en)
DE (1) DE3575666D1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0299343A1 (en) * 1987-07-07 1989-01-18 I.R.C.A. S.p.a. Industria Resistenze Corazzate e Affini Heating element for household electrical appliances
US4825043A (en) * 1985-07-23 1989-04-25 E.G.O. Elektro-Gerate Blanc U. Fischer Electric continuous flow heater for liquid containers
US5138693A (en) * 1986-03-26 1992-08-11 E.G.O. Elektro-Gerate Blanc U. Fischer Electric fluid heater with thermosphonic fluid circulation
WO2019197479A1 (en) * 2018-04-10 2019-10-17 BSH Hausgeräte GmbH Domestic appliance with at least one heater for a tubular piece, through which a fluid flows

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD415264S (en) 1997-12-08 1999-10-12 Sherwood-Templeton Coal Company, Inc. Water heater

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1690677A1 (en) * 1968-02-28 1971-06-09 Stiebel Werke Gmbh & Co Dr Electric instant water heater
DE7707584U1 (en) * 1977-03-11 1977-06-23 Siemens Ag, 1000 Berlin Und 8000 Muenchen Electric water heater for coffee machines
DE3307962A1 (en) * 1983-03-07 1984-09-20 Siemens AG, 1000 Berlin und 8000 München Electrical continuous-flow heater for a drinks dispenser

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1690677A1 (en) * 1968-02-28 1971-06-09 Stiebel Werke Gmbh & Co Dr Electric instant water heater
DE7707584U1 (en) * 1977-03-11 1977-06-23 Siemens Ag, 1000 Berlin Und 8000 Muenchen Electric water heater for coffee machines
DE3307962A1 (en) * 1983-03-07 1984-09-20 Siemens AG, 1000 Berlin und 8000 München Electrical continuous-flow heater for a drinks dispenser

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4825043A (en) * 1985-07-23 1989-04-25 E.G.O. Elektro-Gerate Blanc U. Fischer Electric continuous flow heater for liquid containers
US5138693A (en) * 1986-03-26 1992-08-11 E.G.O. Elektro-Gerate Blanc U. Fischer Electric fluid heater with thermosphonic fluid circulation
EP0299343A1 (en) * 1987-07-07 1989-01-18 I.R.C.A. S.p.a. Industria Resistenze Corazzate e Affini Heating element for household electrical appliances
WO2019197479A1 (en) * 2018-04-10 2019-10-17 BSH Hausgeräte GmbH Domestic appliance with at least one heater for a tubular piece, through which a fluid flows

Also Published As

Publication number Publication date
ATE49865T1 (en) 1990-02-15
DE3575666D1 (en) 1990-03-08
EP0185874B1 (en) 1990-01-31

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