EP2565551A1 - Heat block and continous-flow water heating unit - Google Patents
Heat block and continous-flow water heating unit Download PDFInfo
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- EP2565551A1 EP2565551A1 EP12182534A EP12182534A EP2565551A1 EP 2565551 A1 EP2565551 A1 EP 2565551A1 EP 12182534 A EP12182534 A EP 12182534A EP 12182534 A EP12182534 A EP 12182534A EP 2565551 A1 EP2565551 A1 EP 2565551A1
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 114
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 25
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims description 12
- 239000008236 heating water Substances 0.000 claims description 7
- 230000007704 transition Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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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
- F24H1/101—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 using electric energy supply
- F24H1/102—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 using electric energy supply with resistance
- F24H1/103—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 using electric energy supply with resistance with bare resistances in direct contact with the fluid
Definitions
- the invention relates to a heating block for an electric instantaneous water heater, in particular for the provision of heating water, according to the preamble of claim 1, with a housing in which a meandering heating section is designed for heating a liquid having a plurality of heating channels for receiving heating coils and a plurality of U-shaped deflection areas for deflecting the liquid between the respective adjacent heating channels, and a water heater.
- Heating blocks for instantaneous water heaters for providing heating water are usually designed as a bare-wire systems in which bare heating coils lie directly in the water flow.
- bare-wire systems In comparison to tubular heating elements, bare-wire systems have small heat capacities with a high control dynamic.
- air bubbles in the water flow can significantly complicate the complete flow around the heating coils with water, whereby the heating coils in the respective anhydrous section can overheat and burn through.
- Heating channels in the heating blocks are like in the DE 19 651 087 C2 shown, usually meander-shaped and oriented vertically in the installation position of the water heater. It turns out that those areas of the heating channels are particularly endangered by air bubbles, in which the water flow is guided downwards. The buoyancy of the air bubbles counteracts the flow and the air bubbles are only carried along by the flow at a sufficiently large flow rate. A particularly critical area is immediately downstream of the upper deflection areas. Investigations have shown that, in particular, a gradual widening of the flow cross-section downstream of the upper deflection regions favors the attachment of air bubbles to channel inner walls. A heating block with a gradual widening of the flow cross section is in FIG. 1 shown.
- the heating block has a two-part housing 1, which is formed by two half-shells 2, 4.
- the housing 1 and the interconnected half shells 2, 4 define a meandering Heating path, which is formed by a plurality of heating channels 6a, 6b and a plurality of deflection regions 8, which connect the adjacent heating channels 6a, 6b with each other.
- a meandering Heating path which is formed by a plurality of heating channels 6a, 6b and a plurality of deflection regions 8, which connect the adjacent heating channels 6a, 6b with each other.
- the deflection regions 8 are reduced in cross-section with respect to the heating channels 6a, 6b.
- the upper deflecting regions 8 in the installation position of the heating block or of the throughflow heater each have a conically tapered inlet section 10 and a conically widened outlet section 12.
- the object of the invention is to provide a heating block, which eliminates the aforementioned disadvantages and has an improved flow behavior, so that in particular a fixing of air bubbles downstream of in an installation position upper deflection is prevented. Furthermore, it is an object of the invention to provide a robust water heater.
- An inventive heating block for an electric water heater in particular for providing heating water, has a housing in which a meandering heating path is formed for heating a liquid having a plurality of heating channels for receiving heating coils and a plurality of U-shaped deflection areas for deflecting having the liquid between the respective adjacent heating channels.
- the upper deflection regions in the installation position, have an inlet section for reducing a flow cross-section of the Heating channels on a deflection cross-section and an outlet section, which opens in stages in the respective heating channel.
- a uniform flow over the cross section of the outlet sections of the upper deflection areas or the upper outlet sections can be achieved if they are straight.
- a uniform introduction of the turbulence over the flow cross-section can be achieved if the upper outlet sections are oriented coaxially to the respective heating channel and thus open the front side centrally into the heating channels.
- the upper outlet sections each have a constant outlet cross-section, so that the liquid flow enters the respective heating channel with uniform pressure and speed ratios.
- the upper outlet cross section may be equal to the upper deflection cross section, so that the two features deflecting and swirling or introducing tolerances for bladder driving are both locally and functionally separated.
- the heating block according to the invention can be optimized in particular for domestic use, when the upper outlet sections have an axial extent of about 10mm to 20mm.
- the upper outlet portions and the upper inlet portions have a same axial extent.
- the lower deflecting areas in the installation position each have a lower deflecting cross section corresponding to the flow cross section.
- the deflection regions each have a deflection section defining the upper and lower deflection cross-sections, which extends in the transverse direction of the heating channels between the inlet section and the outlet section.
- An inventive flow heater is provided with a heating block according to the invention.
- Such a water heater is characterized by a high insensitivity to changing flow rates and thus by a high degree of robustness.
- the invention is particularly suitable for providing a heating block for an electrically heated water heater in the field of home appliance technology, which is insensitive to changing flow rates and thus robust and low maintenance.
- FIG. 2 a lower shell 14 of a two-part housing of a heating block according to the invention for an electrically heated water heater for providing heating water in the domestic area is shown.
- An upper shell for forming the housing is not shown, but this is almost identical to the lower shell 14, so that the explanations relating to the lower shell 14 essentially also apply to the upper shell.
- the housing of the heating block which is executed in bare wire technology, defines a heating section 16 for heating the water flowing through the water heater.
- the heating section 16 is viewed in the parting plane of the housing in each case half in the lower shell 14 and taken in half in the upper shell, not shown.
- the lower shell 14 has an inlet connection 18 and an outlet connection 20, which are in fluid communication with a supply line 22 and an overflow section 24.
- the delay line 22 and the overrun section 24 are respectively formed meander-like and have over their entire length a constant and same flow cross-section.
- the heating section 16 extends meandering between the flow path 22 and the overrun 24. It has a plurality of heating channels 26a to 26f and a plurality of deflection regions 28a to 28f.
- the heating channels 26a to 26f serve to receive heating elements, in particular heating coils. They are straight and run parallel next to each other in the longitudinal direction of the housing. They have a constant flow cross section, which is increased compared to the flow cross section of the flow path 22 and the overrun section 24.
- For energizing the Heating elements is formed in the heating channels 26a to 26f each have an opening 30 for receiving cooperating with the heating elements electrical contact elements.
- the deflection regions 28a to 28f serve to connect the respectively adjacent heating elements 26a to 26f and thus to redirect the water. They are U-shaped and each have an inlet section 32a, 32b, a deflection section 34a, 34b and a discharge section 36a, 36b.
- the inlet sections 32a, 32b and the outlet sections 36a, 36b extend in the longitudinal direction of the housing and in particular coaxially with the heating channels 26a to 26f.
- the inlet sections 32a, 32b and the outlet sections 36a, 36b have the same length.
- the deflection portions 34a, 34b are oriented substantially in the transverse direction of the heating channels 26a to 26f.
- the deflection regions 28a to 28f can be subdivided into lower deflection regions 28b, 28d, 28f and into upper deflection regions 28a, 28c, 28e.
- the lower deflection regions 28b, 28d, 28f each have a lower deflection cross-section which is equal to or nearly equal to the flow cross-section of the heating channels 26a to 26f. That is, the lower inflow portions 32b, the lower divert portions 34b, and the lower drain portions 36b have a uniform constant inner cross section that is equal to or nearly equal to the flow area of the heating passages 26a to 26f.
- the upper deflection regions 28a, 28c, 28e and in particular their deflection sections 34a each have an upper deflection cross-section, which is reduced in relation to the flow cross-section of the heating channels 26a to 26f.
- the inlet sections 32a of the upper deflection regions 28c, 28e which are arranged between two respective heating channels 26b, 26c and 26d, 26e, have a conically tapered inlet cross section, as viewed in the direction of flow
- the inlet section 32a of the upper deflection region 28a, which is arranged between the flow path 22 and the heating section 16 has a constant inlet cross-section.
- a cross-sectional reduction to the upper deflection cross-section is not necessary in that than the deflection cross section of the upper deflection section 34a is equal to the flow cross section of the flow path 22.
- the outlet portions 36a of the upper deflection regions 28a, 28c, 28e and the upper outlet portions 36a are cylindrical and have a constant outlet cross section, which is equal to the upper deflection cross section of the deflection portions 34a.
- the outlet sections 38a open into the heating channels 26a, 26c, 26e in a stepped manner, whereby an annular surface 38 extending transversely to the flow direction is formed in the transition region.
- the spout portions 38a preferably have an axial extent of about 10mm to 20mm.
- FIG. 3 is the in FIG. 2 shown open heating section 16 closed example shown in the region of the upper deflection region 28c.
- FIG. 3 essential features of the invention figuratively illustrated from another perspective. However, the order used below is not a weighting of the features.
- the heating channels 26b, 26c have a constant flow area.
- the upper deflection portion 34a has a deflection cross-section which is reduced from the flow area of the heating channels 26b, 26c.
- the upper inlet section 32a has a conically reduced inflow cross section, whereby the flow cross section of the heating channel 26b is slowly reduced to the deflection cross section.
- the upper spout portion 36a has a constant spout cross section equal to the turnaround section of the spool portion 34a.
- the upper inlet portion 32a and the upper outlet portion 36a are coaxial with the heating channels 26b, 26c and are connected end-to-end with the heating channel 26b and the heating channel 26c, respectively.
- the deflecting portion 34a is transverse to the heating channels 26b, 26c.
- the upper inlet portion 32a and the upper outlet portion 36a the same length.
- the upper outlet portion 36a opens like a step into the heating channel 26c, that a rapid and especially abrupt and thus sudden cross-sectional widening of the upper outlet cross-section 36a and thus the same large upper deflection on the flow cross-section.
- a heating block for an electric water heater in particular for providing heating water, comprising a housing in which a meandering heating path is formed for heating a liquid having a plurality of heating channels for receiving heating coils and a plurality of U-shaped deflection areas Having deflected the liquid between the respective adjacent heating channels, wherein in installation position, the upper deflection regions have an inlet section for reducing a flow cross-section of the heating channels on a Umlenkquer4.000 and a discharge section, which opens like a step into the respective heating channel, and a water heater.
Abstract
Description
Die Erfindung betrifft einen Heizblock für einen elektrischen Durchlauferhitzer, insbesondere zur Bereitstellung von Heizwasser, nach dem Oberbegriff des Patentanspruchs 1, mit einem Gehäuse, in dem eine mäanderartig verlaufende Heizstrecke zum Erwärmen einer Flüssigkeit ausgebildet ist, die eine Vielzahl von Heizkanälen zur Aufnahme von Heizwendeln und eine Vielzahl von U-förmigen Umlenkbereichen zum Umlenken der Flüssigkeit zwischen den jeweils benachbarten Heizkanälen aufweist, sowie ein Durchlauferhitzer.The invention relates to a heating block for an electric instantaneous water heater, in particular for the provision of heating water, according to the preamble of claim 1, with a housing in which a meandering heating section is designed for heating a liquid having a plurality of heating channels for receiving heating coils and a plurality of U-shaped deflection areas for deflecting the liquid between the respective adjacent heating channels, and a water heater.
Heizblöcke für Durchlauferhitzer zum Bereitstellen von Heizwasser sind gewöhnlich als Blankdrahtsysteme ausgeführt, bei denen blanke Heizwendeln unmittelbar in der Wasserströmung liegen. Im Vergleich zu Rohrheizkörpern haben Blankdrahtsysteme kleine Wärmekapazitäten mit einer hohen Regeldynamik. Luftblasen in der Wasserströmung können jedoch die vollständige Umströmung der Heizwendeln mit Wasser wesentlich erschweren, wodurch die Heizwendeln in dem jeweiligen wasserfreien Abschnitt überhitzen und durchbrennen können.Heating blocks for instantaneous water heaters for providing heating water are usually designed as a bare-wire systems in which bare heating coils lie directly in the water flow. In comparison to tubular heating elements, bare-wire systems have small heat capacities with a high control dynamic. However, air bubbles in the water flow can significantly complicate the complete flow around the heating coils with water, whereby the heating coils in the respective anhydrous section can overheat and burn through.
Heizkanäle in den Heizblöcken sind wie in der
Aufgabe der Erfindung ist es, einen Heizblock zu schaffen, der die vorgenannten Nachteile beseitigt und ein verbessertes Strömungsverhalten aufweist, so dass insbesondere eine Festsetzung von Luftblasen stromab von in einer Installationslage oberen Umlenkbereichen verhindert wird. Des Weiteren ist es Aufgabe der Erfindung, einen robusten Durchlauferhitzer zu schaffen.The object of the invention is to provide a heating block, which eliminates the aforementioned disadvantages and has an improved flow behavior, so that in particular a fixing of air bubbles downstream of in an installation position upper deflection is prevented. Furthermore, it is an object of the invention to provide a robust water heater.
Diese Aufgabe wird gelöst durch einen Heizblock mit den Merkmalen des Patentanspruchs 1 und durch einen Durchlauferhitzer mit den Merkmalen des Patentanspruchs 11. Vorteilhafte Aus- und Weiterbildungen, welche einzeln oder in Kombination miteinander einsetzbar sind, sind Gegenstand der jeweils abhängigen Ansprüche.This object is achieved by a heating block with the features of patent claim 1 and by a water heater having the features of claim 11. Advantageous embodiments and further developments, which are used individually or in combination with each other, are the subject of the respective dependent claims.
Ein erfindungsgemäßer Heizblock für einen elektrischen Durchlauferhitzer, insbesondere zur Bereitstellung von Heizwasser, hat ein Gehäuse, in dem eine mäanderartig verlaufende Heizstrecke zum Erwärmen einer Flüssigkeit ausgebildet ist, die eine Vielzahl von Heizkanälen zur Aufnahme von Heizwendeln und eine Vielzahl von U-förmigen Umlenkbereichen zum Umlenken der Flüssigkeit zwischen den jeweils benachbarten Heizkanälen aufweist. Erfindungsgemäß haben in Installationslage die oberen Umlenkbereiche einen Zulaufabschnitt zur Reduzierung eines Durchflussquerschnitts der Heizkanäle auf einen Umlenkquerschnitt sowie einen Auslaufabschnitt, der stufenartig in den jeweiligen Heizkanal mündet.An inventive heating block for an electric water heater, in particular for providing heating water, has a housing in which a meandering heating path is formed for heating a liquid having a plurality of heating channels for receiving heating coils and a plurality of U-shaped deflection areas for deflecting having the liquid between the respective adjacent heating channels. According to the invention, in the installation position, the upper deflection regions have an inlet section for reducing a flow cross-section of the Heating channels on a deflection cross-section and an outlet section, which opens in stages in the respective heating channel.
Durch die stufenartige Einmündung wird eine abrupte Aufweitung des Strömungsquerschnittes erreicht. Die abrupte Aufweitung versucht gezielte Turbulenzen, die dazu führen, dass die Flüssigkeitsströmung den vollen Heizkanalquerschnitt erfasst und an einer Kanalinnenwandung anheftende Gasblasen wie Luftblasen mitreißt. Insbesondere erfolgt bereits eine Ablösung von Luftblasen bei niedrigen Durchflüssen. Gasblasen stromab von den oberen Umlenkbereichen werden infolge der turbulenten Strömung wirkungsvoll verhindert. Durch die Reduzierung des Durchflussquerschnitts im Bereich des jeweiligen Zulaufabschnitts wird eine Vergleichmäßigung der Strömung im Umlenkbereich erreicht, so dass sich die durch die Stufe eingebrachten Turbulenzen nicht mit stromaufwärts eingebrachten Turbulenzen überlagern, was zu einer Schwächung der stufenseitigen Turbulenzen führen könnte.By the step-like confluence an abrupt expansion of the flow cross-section is achieved. The abrupt expansion attempts targeted turbulence, which causes the liquid flow to capture the full Heizkanalquerschnitt and entraining at a channel inner wall adhering gas bubbles such as air bubbles. In particular, there is already a detachment of air bubbles at low flow rates. Gas bubbles downstream of the upper deflection regions are effectively prevented due to the turbulent flow. By reducing the flow cross-section in the region of the respective inflow section, a homogenization of the flow in the deflection region is achieved, so that the turbulences introduced by the step do not overlap with upstream turbulences, which could lead to a weakening of the side-side turbulence.
Eine über den Querschnitt gleichmäßige Durchströmung der Auslaufabschnitte der oberen Umlenkbereiche bzw. der oberen Auslaufabschnitte lässt sich erreichen, wenn diese gerade ausgebildet sind.A uniform flow over the cross section of the outlet sections of the upper deflection areas or the upper outlet sections can be achieved if they are straight.
Eine gleichmäßige Einbringung der Turbulenzen über den Durchflussquerschnitt lässt sich erreichen, wenn die oberen Auslaufabschnitte koaxial zum jeweiligen Heizkanal orientiert sind und somit stirnseitig zentral in die Heizkanäle münden.A uniform introduction of the turbulence over the flow cross-section can be achieved if the upper outlet sections are oriented coaxially to the respective heating channel and thus open the front side centrally into the heating channels.
Vorzugsweise haben die oberen Auslaufabschnitte jeweils einen konstanten Auslaufquerschnitt, so dass die Flüssigkeitsströmung mit vergleichmäßigten Druck- und Geschwindigkeitsverhältnissen in den jeweiligen Heizkanal eintritt.Preferably, the upper outlet sections each have a constant outlet cross-section, so that the liquid flow enters the respective heating channel with uniform pressure and speed ratios.
Dabei kann der obere Auslaufquerschnitt gleich dem oberen Umlenkquerschnitt sein, so dass die beiden Merkmale Umlenken und Verwirbeln bzw. Einbringung von Toleranzen zur Blasenmitnahme sowohl örtlich, als auch funktionell getrennt sind.In this case, the upper outlet cross section may be equal to the upper deflection cross section, so that the two features deflecting and swirling or introducing tolerances for bladder driving are both locally and functionally separated.
Der erfindungsgemäße Heizblock lässt sich insbesondere für den häuslichen Gebrauch optimieren, wenn die oberen Auslaufabschnitte eine axiale Erstreckung von etwa 10mm bis 20mm aufweisen.The heating block according to the invention can be optimized in particular for domestic use, when the upper outlet sections have an axial extent of about 10mm to 20mm.
Bevorzugsweise haben die oberen Auslaufabschnitte und die oberen Zulaufabschnitte eine gleiche axiale Erstreckung.Preferably, the upper outlet portions and the upper inlet portions have a same axial extent.
Zur Reduzierung von Turbulenzen bereits in den Zulaufabschnitten ist es vorteilhaft, wenn deren Zulaufquerschnitt in Strömungsrichtung konisch verjüngt ist.To reduce turbulence already in the inlet sections, it is advantageous if their inlet cross-section is conically tapered in the flow direction.
Zur Vermeidung von Turbulenzen in den in Installationslage betrachtet unteren Umlenkbereichen ist es vorteilhaft, wenn die in Installationslage unteren Umlenkbereiche jeweils einen dem Durchflussquerschnitt entsprechenden unteren Umlenkquerschnitt haben.In order to avoid turbulence in the lower deflecting areas considered in the installation position, it is advantageous if the lower deflecting areas in the installation position each have a lower deflecting cross section corresponding to the flow cross section.
Bevorzugterweise haben die Umlenkbereiche jeweils einen den oberen und unteren Umlenkquerschnitt definierenden Umlenkabschnitt, der sich in Querrichtung der Heizkanäle zwischen dem Zulaufabschnitt und dem Ablaufabschnitt erstreckt.Preferably, the deflection regions each have a deflection section defining the upper and lower deflection cross-sections, which extends in the transverse direction of the heating channels between the inlet section and the outlet section.
Ein erfindungsgemäßer Durchlauferhitzer ist mit einem erfindungsgemäßen Heizblock versehen. Ein derartiger Durchlauferhitzer zeichnet sich durch eine hohe Unempfindlichkeit gegenüber wechselnden Durchflussmengen und somit durch eine hohe Robustheit aus.An inventive flow heater is provided with a heating block according to the invention. Such a water heater is characterized by a high insensitivity to changing flow rates and thus by a high degree of robustness.
Sonstige vorteilhafte Ausführungsbeispiele der vorliegenden Erfindung sind Gegenstand weiterer Unteransprüche.Other advantageous embodiments of the present invention are the subject of further subclaims.
Die Erfindung eignet sich insbesondere zur Bereitstellung eines Heizblockes für einen elektrisch beheizten Durchlauferhitzer im Bereich der Hausgerätetechnik, der unempfindlich gegenüber wechselnden Durchflussmengen und somit robust und wartungsarm ist.The invention is particularly suitable for providing a heating block for an electrically heated water heater in the field of home appliance technology, which is insensitive to changing flow rates and thus robust and low maintenance.
Im Folgenden werden bevorzugte Ausführungsbeispiele der Erfindung anhand schematischer Darstellungen näher erläutert. Es zeigen:
- Figur 1
- eine Explosionsdarstellung eines Gehäuses eines bekannten Heizblocks,
Figur 2- eine Draufsicht auf eine Gehäusehalbschale eines erfindungsgemäßen Heizblocks, und
- Figur 3
- einen Abschnitt einer umfangsseitig geschlossenen Heizstrecke aus
.Figur 2
- FIG. 1
- an exploded view of a housing of a known heating block,
- FIG. 2
- a plan view of a housing half shell of a heating block according to the invention, and
- FIG. 3
- a section of a peripherally closed heating section
FIG. 2 ,
Im Folgenden werden für gleiche konstruktive Elemente gleiche Bezugszeichen verwenden. Aus Gründen der Übersichtlichkeit sind jedoch nur einige der gleichen konstruktiven Elemente mit einem Bezugszeichen versehen.In the following, the same reference numerals will be used for identical structural elements. For reasons of clarity, however, only some of the same structural elements are provided with a reference numeral.
In
Das Gehäuse des Heizblocks, der in Blankdrahttechnik ausgeführt ist, definiert eine Heizstrecke 16 zum Erwärmen des den Durchlauferhitzer durchströmenden Wassers. Die Heizstrecke 16 ist in der Trennebene des Gehäuses betrachtet jeweils hälftig in der Unterschale 14 und hälftig in der nicht gezeigten Oberschale aufgenommen. Zum Zuführen von Kaltwasser und zur Entnahme des Heizwassers weist die Unterschale 14 einen Zulaufstutzen 18 und einen Auslaufstutzen 20 auf, die mit einer Vorlaufstrecke 22 bzw. einer Nachlaufstrecke 24 in Fluidverbindung stehen. Die Vorlaufstrecke 22 und die Nachlaufstrecke 24 sind jeweils mäanderartig ausgebildet und weisen über ihre gesamte Länge einen konstanten und gleichen Strömungsquerschnitt auf.The housing of the heating block, which is executed in bare wire technology, defines a
Die Heizstrecke 16 erstreckt sich mäanderartig zwischen der Vorlaufstrecke 22 und der Nachlaufstrecke 24. Sie weist eine Vielzahl von Heizkanälen 26a bis 26f und eine Vielzahl von Umlenkbereichen 28a bis 28f auf. Die Heizkanäle 26a bis 26f dienen zur Aufnahme von Heizelementen, insbesondere von Heizwendeln. Sie sind gerade ausgebildet und verlaufen parallel nebeneinanderliegend in Längsrichtung des Gehäuses. Sie haben einen konstanten Durchflussquerschnitt, der gegenüber dem Strömungsquerschnitt der Vorlaufstrecke 22 und der Nachlaufstrecke 24 vergrößert ist. Zur Bestromung der Heizelemente ist in den Heizkanälen 26a bis 26f jeweils ein Durchbruch 30 zur Aufnahme von mit den Heizelementen zusammenwirkenden elektrischen Kontaktelementen ausgebildet.The
Die Umlenkbereiche 28a bis 28f dienen zum Verbinden der jeweils benachbarten Heizelemente 26a bis 26f und somit zum Umlenken des Wassers. Sie sind U-förmig ausgebildet und haben jeweils einen Zulaufabschnitt 32a, 32b, einen Umlenkabschnitt 34a, 34b und einen Auslaufabschnitt 36a, 36b. Die Zulaufabschnitte 32a, 32b und die Auslaufabschnitte 36a, 36b erstrecken sich in Längsrichtung des Gehäuses und insbesondere koaxial zu den Heizkanälen 26a bis 26f. Vorzugsweise sind die Zulaufabschnitte 32a, 32b und die Auslaufabschnitte 36a, 36b gleich lang ausgebildet. Die Umlenkabschnitte 34a, 34b sind im Wesentlichen in Querrichtung zu den Heizkanälen 26a bis 26f orientiert.The
In Installationslage des Durchlauferhitzers lassen sich die Umlenkbereiche 28a bis 28f in untere Umlenkbereiche 28b, 28d, 28f und in obere Umlenkbereiche 28a, 28c, 28e unterteilen. Die unteren Umlenkbereiche 28b, 28d, 28f haben jeweils einen unteren Umlenkquerschnitt, der gleich bzw. nahezu gleich dem Durchflussquerschnitt der Heizkanäle 26a bis 26f ist. Das heißt, die unteren Zulaufabschnitte 32b, die unteren Umlenkabschnitte 34b und die unteren Ablaufabschnitte 36b haben einen einheitlichen konstanten Innenquerschnitt, der gleich bzw. nahezu gleich dem Durchflussquerschnitt der Heizkanäle 26a bis 26f ist.In installation position of the water heater, the
Die oberen Umlenkbereiche 28a, 28c, 28e und insbesondere deren Umlenkabschnitte 34a haben jeweils einen oberen Umlenkquerschnitt, der gegenüber dem Durchflussquerschnitt der Heizkanäle 26a bis 26f reduziert ist. Zur Reduzierung des Durchflussquerschnitts der Heizkanäle 26b, 26d auf den Umlenkquerschnitt der oberen Umlenkabschnitte 34a haben die Zulaufabschnitte 32a der oberen Umlenkbereiche 28c, 28e, die zwischen jeweils zwei Heizkanälen 26b, 26c bzw. 26d, 26e angeordnet sind, in Strömungsrichtung betrachtet einen konisch verjüngten Zulaufquerschnitt. Der Zulaufabschnitt 32a des oberen Umlenkbereiches 28a, der zwischen der Vorlaufstrecke 22 und der Heizstrecke 16 angeordnet ist, hat einen konstanten Zulaufquerschnitt. Eine Querschnittsreduzierung auf den oberen Umlenkquerschnitt ist insofern nicht notwendig, als das der Umlenkquerschnitt des oberen Umlenkabschnitts 34a gleich dem Strömungsquerschnitt der Vorlaufstrecke 22 ist.The
Die Auslaufabschnitte 36a der oberen Umlenkbereiche 28a, 28c, 28e bzw. die oberen Auslaufabschnitte 36a sind zylindrisch ausgebildet und haben einen konstanten Auslaufquerschnitt, der gleich dem oberen Umlenkquerschnitt der Umlenkabschnitte 34a ist. Hierdurch münden die Auslaufabschnitte 38a stufenartig in die Heizkanäle 26a, 26c, 26e, wodurch im Übergangsbereich eine sich quer zur Strömungsrichtung erstreckende Ringfläche 38 gebildet ist. Mittels des stufenartigen und somit abrupten Strömungsübergangs von den Auslaufabschnitten 36a in die Heizkanäle 26a, 26c, 26e bzw. durch die sprunghafte Querschnittsvergrößerung werden gezielt stromab der Umlenkabschnitte 36a Turbulenzen in die Strömung eingebracht, wodurch eine Festsetzung von Luftblasen an Wandungsabschnitten 40 der Heizkanäle 26a, 26c, 26e wirkungsvoll verhindert wird. Für Durchlauferhitzer im häuslichen Bereich haben die Auslaufabschnitte 38a bevorzugterweise eine axiale Erstreckung von etwa 10mm bis 20mm.The
In
Erstens haben die Heizkanäle 26b, 26c einen konstanten Durchflussquerschnitt. Zweitens hat der obere Umlenkabschnitt 34a einen Umlenkquerschnitt, der gegenüber dem Durchflussquerschnitt der Heizkanäle 26b, 26c reduziert ist. Drittens hat der obere Zulaufabschnitt 32a einen konisch reduzierten Zulaufquerschnitt, wodurch der Durchflussquerschnitt des Heizkanals 26b langsam auf den Umlenkquerschnitt verkleinert wird. Viertens hat der obere Auslaufabschnitt 36a einen konstanten Auslaufquerschnitt, der gleich dem Umlenkquerschnitt des Umlenkabschnittes 34a ist. Fünftens verlaufen der obere Zulaufabschnitt 32a und der obere Auslaufabschnitt 36a koaxial zu den Heizkanälen 26b, 26c und sind stirnseitig mit dem Heizkanal 26b bzw. dem Heizkanal 26c verbunden. Sechstens verläuft der Umlenkabschnitt 34a quer zu den Heizkanälen 26b, 26c. Siebtens sind der obere Zulaufabschnitt 32a und der obere Auslaufabschnitt 36a gleich lang ausgebildet. Achtens mündet der obere Auslaufabschnitt 36a stufenartig derart in den Heizkanal 26c, dass eine schnelle und insbesondere abrupte und somit plötzliche Querschnittserweiterung von dem oberen Auslaufquerschnitt 36a und somit dem gleich großen oberen Umlenkquerschnitt auf den Durchflussquerschnitt erfolgt.First, the
Offenbart ist ein Heizblock für einen elektrischen Durchlauferhitzer, insbesondere zur Bereitstellung von Heizwasser, mit einem Gehäuse, in dem eine mäanderartig verlaufende Heizstrecke zum Erwärmen einer Flüssigkeit ausgebildet ist, die eine Vielzahl von Heizkanälen zur Aufnahme von Heizwendeln und eine Vielzahl von U-förmigen Umlenkbereichen zum Umlenken der Flüssigkeit zwischen den jeweils benachbarten Heizkanälen aufweist, wobei in Installationslage die oberen Umlenkbereiche einen Zulaufabschnitt zur Reduzierung eines Durchflussquerschnitts der Heizkanäle auf einen Umlenkquerschnitt sowie einen Auslaufabschnitt haben, der stufenartig in den jeweiligen Heizkanal mündet, sowie ein Durchlauferhitzer.Disclosed is a heating block for an electric water heater, in particular for providing heating water, comprising a housing in which a meandering heating path is formed for heating a liquid having a plurality of heating channels for receiving heating coils and a plurality of U-shaped deflection areas Having deflected the liquid between the respective adjacent heating channels, wherein in installation position, the upper deflection regions have an inlet section for reducing a flow cross-section of the heating channels on a Umlenkquerschnitt and a discharge section, which opens like a step into the respective heating channel, and a water heater.
- 11
- Gehäusecasing
- 22
- OberschaleUpper shell
- 44
- Unterschalesubshell
- 6a, b6a, b
- Heizkanalheating duct
- 88th
- Umlenkbereichdeflection
- 1010
- Zulaufabschnittinlet section
- 1212
- Auslaufabschnittexit section
- 1414
- Unterschalesubshell
- 1616
- Heizstreckeheating section
- 1818
- Zulaufstutzeninlet connection
- 2020
- Auslaufstutzenoutlet connection
- 2222
- Vorlaufstreckestandoff
- 2424
- Nachlaufstrecketrailing route
- 26a bis 26f26a to 26f
- Heizkanalheating duct
- 28a bis 28f28a to 28f
- Umlenkbereichdeflection
- 3030
- Durchbruchbreakthrough
- 32a, b32a, b
- Zulaufabschnittinlet section
- 34a, b34a, b
- Umlenkabschnittdeflecting
- 36a, b36a, b
- Auslaufabschnittexit section
- 3838
- Ringflächering surface
- 4040
- Wandungsabschnittwall section
Claims (11)
Priority Applications (1)
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PL12182534T PL2565551T3 (en) | 2011-09-02 | 2012-08-31 | Heat block and continous-flow water heating unit |
Applications Claiming Priority (1)
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DE102011082106A DE102011082106A1 (en) | 2011-09-02 | 2011-09-02 | Heating block and water heater |
Publications (2)
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EP2565551A1 true EP2565551A1 (en) | 2013-03-06 |
EP2565551B1 EP2565551B1 (en) | 2015-05-20 |
Family
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EP20120182534 Active EP2565551B1 (en) | 2011-09-02 | 2012-08-31 | Heat block and continous-flow water heating unit |
Country Status (3)
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EP (1) | EP2565551B1 (en) |
DE (1) | DE102011082106A1 (en) |
PL (1) | PL2565551T3 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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DE102015216938A1 (en) | 2015-09-03 | 2017-03-09 | BSH Hausgeräte GmbH | Heating block half-shell and heating block to avoid standing air bubbles |
DE102015216937A1 (en) | 2015-09-03 | 2017-03-09 | BSH Hausgeräte GmbH | Heating block half-shell and heating block with guide elements for a heating coil |
DE102022112092A1 (en) | 2022-05-13 | 2023-11-16 | Vaillant Gmbh | Method for producing an electric heater and electric heater |
Citations (8)
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---|---|---|---|---|
DE1301033B (en) * | 1965-08-25 | 1969-08-14 | Licentia Gmbh | Channel body for an electrically heated water heater |
DE3401935A1 (en) * | 1983-01-31 | 1984-08-16 | Joh. Vaillant Gmbh U. Co, 5630 Remscheid | Electrically heated instantaneous heater |
US4960976A (en) * | 1988-07-06 | 1990-10-02 | Creative Capital Corp. | Electrical resistance water heater effecting non-lamellar flow to avert cavitation therein |
DE29603842U1 (en) * | 1996-03-01 | 1997-03-27 | Forbach Gmbh | Electrically heated water heater |
DE19616766A1 (en) * | 1996-04-26 | 1997-11-06 | Stiebel Eltron Gmbh & Co Kg | Electrical continuous-flow water heater |
DE19651085A1 (en) * | 1996-12-09 | 1998-06-10 | Bosch Siemens Hausgeraete | Through flow water heater |
DE29803524U1 (en) * | 1998-02-28 | 1999-07-29 | Forbach Gmbh | Instantaneous water heater with a block-like channel body made of insulating material |
DE19651087C2 (en) | 1996-12-09 | 2002-06-20 | Bsh Bosch Siemens Hausgeraete | Heating block with housing shells |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8332914U1 (en) * | 1983-11-12 | 1984-02-16 | Joh. Vaillant Gmbh U. Co, 5630 Remscheid | ELECTRICALLY HEATED CONTINUOUS HEATER |
FI111397B (en) * | 2001-12-12 | 2003-07-15 | Metso Paper Inc | A method and apparatus for feeding a chemical to a fiber suspension |
-
2011
- 2011-09-02 DE DE102011082106A patent/DE102011082106A1/en not_active Ceased
-
2012
- 2012-08-31 EP EP20120182534 patent/EP2565551B1/en active Active
- 2012-08-31 PL PL12182534T patent/PL2565551T3/en unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1301033B (en) * | 1965-08-25 | 1969-08-14 | Licentia Gmbh | Channel body for an electrically heated water heater |
DE3401935A1 (en) * | 1983-01-31 | 1984-08-16 | Joh. Vaillant Gmbh U. Co, 5630 Remscheid | Electrically heated instantaneous heater |
US4960976A (en) * | 1988-07-06 | 1990-10-02 | Creative Capital Corp. | Electrical resistance water heater effecting non-lamellar flow to avert cavitation therein |
DE29603842U1 (en) * | 1996-03-01 | 1997-03-27 | Forbach Gmbh | Electrically heated water heater |
DE19616766A1 (en) * | 1996-04-26 | 1997-11-06 | Stiebel Eltron Gmbh & Co Kg | Electrical continuous-flow water heater |
DE19651085A1 (en) * | 1996-12-09 | 1998-06-10 | Bosch Siemens Hausgeraete | Through flow water heater |
DE19651087C2 (en) | 1996-12-09 | 2002-06-20 | Bsh Bosch Siemens Hausgeraete | Heating block with housing shells |
DE29803524U1 (en) * | 1998-02-28 | 1999-07-29 | Forbach Gmbh | Instantaneous water heater with a block-like channel body made of insulating material |
Also Published As
Publication number | Publication date |
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DE102011082106A1 (en) | 2013-03-07 |
PL2565551T3 (en) | 2015-10-30 |
EP2565551B1 (en) | 2015-05-20 |
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