WO2008098391A1 - Boiler for heating water and generating water vapor - Google Patents

Boiler for heating water and generating water vapor Download PDF

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Publication number
WO2008098391A1
WO2008098391A1 PCT/CH2008/000048 CH2008000048W WO2008098391A1 WO 2008098391 A1 WO2008098391 A1 WO 2008098391A1 CH 2008000048 W CH2008000048 W CH 2008000048W WO 2008098391 A1 WO2008098391 A1 WO 2008098391A1
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WO
WIPO (PCT)
Prior art keywords
container
boiler
lid
water
boiler according
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Application number
PCT/CH2008/000048
Other languages
German (de)
French (fr)
Inventor
Markus Anliker
Original Assignee
Egro Coffee Systems Ag
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Filing date
Publication date
Application filed by Egro Coffee Systems Ag filed Critical Egro Coffee Systems Ag
Publication of WO2008098391A1 publication Critical patent/WO2008098391A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/44—Parts or details or accessories of beverage-making apparatus
    • A47J31/54—Water boiling vessels in beverage making machines

Definitions

  • the present invention relates to a boiler for coffee machines for heating water and for generating water vapor according to the preamble of claim 1.
  • Such boilers are used in practice in coffee and espresso machines. Usually, these boilers are made of metallic materials. However, the use of metal has led to high manufacturing costs, since on the one hand the processing is complex and on the other hand, the material costs are high. In addition, these boilers must be precautions against corrosion and thermally insulated because of the good thermal conductivity. Another disadvantage of metal water heaters is that calcareous deposits form on the boiler interior surfaces.
  • the boiler housing consists of a container and a lid, wherein both the container and the lid are made of plastic.
  • the two parts are pressure-tight releasably connected together.
  • the wall thicknesses of the lid and container are designed to withstand an operating pressure of about 10 to 15 bar at about 95 ° C and are in a range of about 4 mm to 10 mm.
  • the filling volume of the boiler is about 2 to 4 liters.
  • the heater is formed by a tubular heater, by a hot plate or by heating rods.
  • the boiler housing can be used for a hot water boiler as well as for a steam boiler. The difference lies in the geometric arrangement of the heater and the filling with water. For the use of the boiler as a hot water boiler this is completely filled with water under a pressure of about 10 bar.
  • the heater is arranged in the interior of the boiler such that the heat is distributed as possible distributed over the entire volume of the water. When using the boiler as a steam boiler this is only about two-thirds filled with water, one third of the steam takes a room.
  • the heater is arranged for this purpose in the interior of the boiler such that when filling the boiler with about two-thirds of the total volume, the heater is completely under water.
  • the operating temperature of the steam boiler is about 130 0 C at an overpressure of about 1.7 bar.
  • the connections for the supply and removal of the water or the steam can be made via simply molded pipes both on the lid and on the container.
  • the boiler can be used both vertically and horizontally.
  • FIG. 1 a schematic cross section through an example according to the present invention constructed hot water boiler is shown.
  • the made of plastic boiler housing 1 with a volume of about 3 liters is composed of a container 2 and a lid 6.
  • plastics only food grade plastics, such as polysulfone (PSU) or polyamide (PA) are used. These plastics are characterized by their heat resistance and strength.
  • the container 2 has a cylindrical or slightly conical shaped container shell 2a, which is closed at its upper end with a spherical shell 8.
  • the wall thickness of the container 2 is about 5 mm.
  • the diameter of the container 2 is advantageously about 30% to 50% of the container length, ie that the container 2 is about two to three times higher than its diameter.
  • the distance from the lid 3 to the top of the spherical shell 8 of the container 2 is to be understood by the container length.
  • Reinforcing ribs 7 can additionally be arranged on the container casing 2a.
  • the lower edge of the container shell 2a forms an outwardly directed collar 10 which rests on the lid 3.
  • a sealing element 6 is arranged between the lid 3 and the lower edge of the container shell 2a.
  • the lid 3 may be held together with the container 2 in the region of the collar 10 by means of screws. Also conceivable are other holding means with which the lid 3 with the container 2 fixed, and again releasable held together, such as by means of a metal sleeve or a clamping ring of a flange.
  • the pressure-tight and pressure-resistant connection between the lid 3 and the container 2 by means of a plastic-compatible plug / snap connection or a screw connection can be made.
  • a thread is advantageously arranged on the outside in the region of the collar 10, onto which the cover 3, which has a correspondingly arranged internal thread, can be screwed on. It is also conceivable that arranged on the inner wall of the container 2 in the region of the collar 10, a thread into which the lid 3, which has a correspondingly arranged external thread, can be screwed.
  • the thickness of the lid 3 is about 7 mm.
  • the two parts of the boiler 1, the container 2 and the lid 3 are made by means of injection molding tools.
  • the surfaces of the boiler 1 are very smooth and the water-wetted inner surface of the boiler 1 compared to metallic systems much less susceptible to adhering dirt particles and calcification.
  • the smooth outer surface of the plastic container has a lower radiation compared to metal boilers or against rib-reinforced boilers whose surface is enlarged by the ribs, which also has a positive effect in terms of heat utilization.
  • the heating element connections 5 for the arranged inside the boiler 1 heater 9, as well as the inlet and outlet guide 4,11 of the water are further to recognize.
  • These connections can be formed by means of simply injection-molded tubes and can be arranged both in the cover 3 and in the container 2 or in the region of the spherical shell 8.
  • Other devices such as thermostat, thermometer and level probe are arranged on easy to be made connections either on the lid 3 or 2 on the container.
  • the heating takes place via a tubular heater 9, which extends over several turns and almost over the entire length of the container in order to be able to deliver the heat distributed as possible over the entire volume of the water.
  • the boiler housing 1 as a steam boiler this is only partially filled with water, the residual volume takes the steam room.
  • the heater 9 is arranged for this purpose in the interior of the boiler 1 with vertical boiler use between the lid 3 and the spherical shell 8 such that the heater 9 is completely under water. Due to the good insulation properties of the plastic is less heat radiation from the boiler 1 than from metal or rib-reinforced boilers, whereby the boiler 1 can be operated both for hot water production as well as for steam generation with lower heat output.
  • boiler 1 described both the lid 3 as well as the container 2 made of the same plastic such as polysulfone (PSU) or polyamide (PA). It is also conceivable that the lid 3 and the container 2 are made of different plastics.
  • PSU polysulfone
  • PA polyamide
  • the plastic boiler for use in coffee machines has a number of advantages over conventional metal boilers. Connections and Feedthroughs for water supply and discharge or steam discharge can be taken into account already in the production of the container 2 and lid 3, which brings a simplified post-processing and assembly with it. Furthermore, the lower density of the plastic compared to steel results in a weight saving of almost 50%. This weight saving benefits during transport and thus helps to save transport costs. Due to the smooth inner wall of the plastic boiler less calcium deposits form against metal walls. Due to the greater thermal expansion of the plastic compared to metallic bodies, the lime formed at most on the wall shatters better and can be easily rinsed out.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Cookers (AREA)

Abstract

The present invention relates to a boiler for heating water for a coffee or espresso machine, having a heating device (9) disposed on the inside, and having connections for the cold water supply (4) and hot water or vapor outlet (11). The boiler housing (1) comprises a plastic container (2) and a plastic cover (3). The boiler container (2) is detachably connected to the boiler cover (3) in a pressure-tight manner. The wall thicknesses of the cover (3) and of the container (2) are configured such that they withstand an operating pressure of about 10 to 15 bars at a temperature of about 95°C. The filling volume of the boiler (1) is approximately 2 to 4 liters. The heating device (9) is formed by a tubular heater, a heating plate, or heating rods. The boiler housing can be utilized for a hot water boiler, and for a vapor boiler, wherein the difference is in the geometric arrangement of the heating device (9) and the water filling. The connections (4, 11) for the water or vapor supply and removal are established via injection-molded pipes, which may be disposed on the cover (3) and/or on the container (2).

Description

Boiler zum Erwärmen von Wasser und Erzeugen von Wasserdampf Boiler for heating water and generating water vapor
[0001] Die vorliegende Erfindung betrifft einen Boiler für Kaffeemaschinen zum Erwärmen von Wasser und zur Erzeugung von Wasserdampf gemäss dem Oberbegriff des Anspruchs 1.The present invention relates to a boiler for coffee machines for heating water and for generating water vapor according to the preamble of claim 1.
[0002] Derartige Boiler werden in der Praxis bei Kaffee- und Espressomaschinen verwendet. Üblicherweise werden diese Boiler aus metallischen Werkstoffen hergestellt. Die Verwendung von Metall führte jedoch zu hohen Herstellungskosten, da einerseits die Bearbeitung aufwendig ist und andererseits die Materialkosten hoch sind. Zusätzlich müssen bei diesen Boilern Vorkehrungen gegen Korrosion getroffen und wegen der guten Wärmeleitfähigkeit thermisch isoliert werden. Ein weiterer Nachteil der Boiler aus Metall ist, dass sich an den Boilerinnenflächen Kalkablagerungen bilden.Such boilers are used in practice in coffee and espresso machines. Usually, these boilers are made of metallic materials. However, the use of metal has led to high manufacturing costs, since on the one hand the processing is complex and on the other hand, the material costs are high. In addition, these boilers must be precautions against corrosion and thermally insulated because of the good thermal conductivity. Another disadvantage of metal water heaters is that calcareous deposits form on the boiler interior surfaces.
[0003] Es ist Aufgabe der vorliegenden Erfindung, einen Boiler für Kaffeemaschinen zum Erwärmen von Wasser und zur Erzeugung von Wasserdampf bereitzustellen, um damit die Nachteile traditioneller Vorrichtungen mit Metalltanks zu vermeiden.It is an object of the present invention to provide a boiler for coffee machines for heating water and for generating water vapor, so as to avoid the disadvantages of traditional devices with metal tanks.
[0004] Die vorstehende Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst. Weitere Merkmale und Vorteile der vorliegenden Erfindung werden an Hand der folgenden Beschreibung eines bevorzugten Ausführungsbeispiels insbesondere unter Bezugnahme der beigefügten Zeichnung erläutert, wobei in der Figur ein schematischer Querschnitt durch einen gemäss der vorliegenden Erfindung aufgebauten Warmwasserboiler gezeigt ist. [0005] Das Prinzip des erfindungsgemässen Boilers liegt darin, dass das Boilergehäuse aus einem Behälter und einem Deckel besteht, wobei sowohl der Behälter wie auch der Deckel aus Kunststoff gefertigt sind. Die beiden Teile sind druckdicht lösbar miteinander verbunden. Die Wandstärken von Deckel und Behälter sind so ausgelegt, dass sie einen Betriebsdruck von etwa 10 bis 15 bar bei etwa 95° C Stand halten und liegen in einem Bereich von ca. 4 mm bis 10 mm. Das Füllvolumen des Boilers liegt bei etwa 2 bis 4 Liter. Die Heizeinrichtung ist durch einen Rohrheizkörper, durch eine Heizplatte oder durch Heizstäbe gebildet. Das Boilergehäuse kann sowohl für einen Heisswasserboiler wie auch für einen Dampfboiler eingesetzt werden. Der Unterschied liegt in der geometrischen Anordnung der Heizeinrichtung und der Befüllung mit Wasser. Für die Verwendung des Boilers als Heisswasserboiler ist dieser vollständig unter einem Druck von etwa 10 bar mit Wasser gefüllt. Die Heizeinrichtung ist im Innenraum des Boilers derart angeordnet, dass die Wärme möglichst verteilt über das gesamte Volumen an das Wasser abgegeben wird. Bei der Verwendung des Boilers als Dampfboiler ist dieser nur zu etwa zwei Drittel mit Wasser gefüllt, ein Drittel nimmt der Dampf räum ein. Die Heizeinrichtung ist für diesen Verwendungszweck im Innenraum des Boilers derart angeordnet, dass bei einer Befüllung des Boilers mit etwa zwei Drittel des Gesamtvolumens die Heizeinrichtung vollständig unter Wasser liegt. Die Betriebstemperatur beträgt beim Dampfboiler etwa 1300 C bei einem Überdruck von ca. 1.7 bar. Die Anschlüsse für die Zu- und Wegführung des Wassers bzw. des Dampfes können über einfach angespritzte Rohre sowohl am Deckel wie auch am Behälter erfolgen. Der Boiler kann sowohl vertikal wie auch horizontal eingesetzt werden.The above object is solved by the features of claim 1. Further features and advantages of the present invention will become apparent from the following description of a preferred embodiment in particular with reference to the accompanying drawings, wherein in the figure is shown a schematic cross section through a built according to the present invention, a water heater. The principle of the inventive boiler is that the boiler housing consists of a container and a lid, wherein both the container and the lid are made of plastic. The two parts are pressure-tight releasably connected together. The wall thicknesses of the lid and container are designed to withstand an operating pressure of about 10 to 15 bar at about 95 ° C and are in a range of about 4 mm to 10 mm. The filling volume of the boiler is about 2 to 4 liters. The heater is formed by a tubular heater, by a hot plate or by heating rods. The boiler housing can be used for a hot water boiler as well as for a steam boiler. The difference lies in the geometric arrangement of the heater and the filling with water. For the use of the boiler as a hot water boiler this is completely filled with water under a pressure of about 10 bar. The heater is arranged in the interior of the boiler such that the heat is distributed as possible distributed over the entire volume of the water. When using the boiler as a steam boiler this is only about two-thirds filled with water, one third of the steam takes a room. The heater is arranged for this purpose in the interior of the boiler such that when filling the boiler with about two-thirds of the total volume, the heater is completely under water. The operating temperature of the steam boiler is about 130 0 C at an overpressure of about 1.7 bar. The connections for the supply and removal of the water or the steam can be made via simply molded pipes both on the lid and on the container. The boiler can be used both vertically and horizontally.
[0006] In der Figur ist ein schematischer Querschnitt durch einen gemäss der vorliegenden Erfindung beispielsweise aufgebauten Warmwasserboiler gezeigt. Das aus Kunststoff gefertigte Boilergehäuse 1 mit einem Volumen von etwa 3 Litern ist aus einem Behälter 2 und einem Deckel 6 zusammengesetzt. Als Kunststoffe kommen nur lebensmitteltaugliche Kunststoffe, wie beispielsweise Polysulfon (PSU) oder Polyamid (PA) zur Anwendung. Diese Kunststoffe zeichnen sich durch ihre Hitzebeständigkeit und Festigkeit aus. Der Behälter 2 weist einen zylindrisch oder leicht konisch geformten Behältermantel 2a auf, der an seinem oberen Ende mit einer Kugelschale 8 abgeschlossen ist. Die Wandstärke des Behälters 2 beträgt etwa 5 mm. Der Durchmesser des Behälters 2 beträgt vorteilsweise etwa 30 % bis 50% der Behälterlänge, d.h. dass der Behälter 2 etwa zwei bis drei mal höher als sein Durchmesser ist. Dabei ist unter der Behälterlänge der Abstand vom Deckel 3 bis zur Kuppe der Kugelschale 8 des Behälters 2 zu verstehen. Am Behältermantel 2a können zusätzlich Verstärkungsrippen 7 angeordnet sein. Den unteren Rand des Behältermantels 2a bildet ein nach aussen gerichteter Kragen 10, der auf dem Deckel 3 aufliegt. Zwischen dem Deckel 3 und dem unteren Rand des Behältermantels 2a ist ein Dichtelement 6 angeordnet. Der Deckel 3 kann mit dem Behälter 2 im Bereich des Kragens 10 mittels Schrauben zusammengehalten sein. Denkbar sind aber auch andere Haltemittel, mit denen der Deckel 3 mit dem Behälter 2 fest, und wieder lösbare zusammengehalten ist, wie beispielsweise mittels einer Metallmanschette oder einem Spannring einer Flanschverbindung. In einer anderen Ausführung kann die druckdichte und druckfeste Verbindung zwischen dem Deckel 3 und dem Behälter 2 mittels einer kunststoffgerechten Steck/Schnappverbindung oder einer Schraubverbindung hergestellt werden. Bei der Schraubverbindung ist vorteilsweise an der Aussenseite im Bereich des Kragens 10 ein Gewinde angeordnet, auf welches der Deckel 3, der ein entsprechen angeordnetes Innengewinde aufweist, aufschraubbar ist. Es ist auch denkbar, dass an der Innenwand des Behälters 2 im Bereich des Kragens 10 ein Gewinde angeordnet, in welches der Deckel 3, der ein entsprechen angeordnetes Aussengewinde aufweist, einschraubbar ist. Die Dicke des Deckels 3 beträgt ca. 7 mm. Aufgrund der Isolationseigenschaften des Kunststoffs erübrigt sich bei den genannten Wandstärken des Boilers 1 eine thermische Isolation und erlauben eine bessere Wärmeausnutzung der Heizung. Die beiden Teile des Boilers 1 , der Behälter 2 und der Deckel 3 sind mittels Spritzgusswerkzeugen hergestellt. Dadurch sind die Oberflächen des Boilers 1 sehr glatt und die wasserberührte Innenfläche des Boilers 1 gegenüber metallischen Systemen wesentlich weniger anfällig für anhaftende Schmutzpartikel und für Verkalkung. Die glatte Aussenoberfläche des Kunststoffbehälters weist eine geringere Abstrahlung gegenüber Metallboilern bzw. gegenüber rippenverstärkten Boilern auf, deren Oberfläche durch die Rippen vergrössert ist, was sich in Bezug auf die Wärmeausnutzung ebenfalls positiv auswirkt. Am Deckel 3 sind weiter die Heizelementanschlüsse 5 für die im Innern des Boilers 1 angeordnete Heizeinrichtung 9, sowie die Zu- und Wegführung 4,11 des Wassers zu erkennen. Diese Anschlüsse können mittels einfach angespritzter Rohre ausgebildet und sowohl im Deckel 3 wie auch im Behälter 2 oder im Bereich der Kugelschale 8 angeordnet sein. Weitere Einrichtungen wie Thermostat, Thermometer und Niveausonde sind über einfach herzustellende Anschlüsse entweder am Deckel 3 oder am Behälter 2 angeordnet. Die Heizung erfolgt über einen Rohrheizkörper 9, der sich über mehrere Windungen und nahezu über die gesamte Behälterlänge erstreckt, um die Wärme möglichst verteilt über das gesamte Volumen an das Wasser abgegeben zu können. Bei der Verwendung des Boilergehäuses 1 als Dampfboiler ist dieser nur zum Teil mit Wasser gefüllt, das Restvolumen nimmt der Dampfraum ein. Die Heizeinrichtung 9 ist für diesen Verwendungszweck im Innenraum des Boilers 1 bei vertikaler Boilerverwendung zwischen dem Deckel 3 und der Kugelschale 8 derart angeordnet, dass die Heizeinrichtung 9 vollständig unter Wasser liegt. Aufgrund der guten Isolationseigenschaften des Kunststoffes erfolgt weniger Wärmeabstrahlung vom Boiler 1 als von Metall- bzw. von rippenverstärkten Boilern, wodurch der Boiler 1 sowohl für die Heisswassererzeugung wie auch für die Dampferzeugung mit geringerer Heizleistung betrieben werden kann.In the figure, a schematic cross section through an example according to the present invention constructed hot water boiler is shown. The made of plastic boiler housing 1 with a volume of about 3 liters is composed of a container 2 and a lid 6. As plastics only food grade plastics, such as polysulfone (PSU) or polyamide (PA) are used. These plastics are characterized by their heat resistance and strength. The container 2 has a cylindrical or slightly conical shaped container shell 2a, which is closed at its upper end with a spherical shell 8. The wall thickness of the container 2 is about 5 mm. The diameter of the container 2 is advantageously about 30% to 50% of the container length, ie that the container 2 is about two to three times higher than its diameter. Here, the distance from the lid 3 to the top of the spherical shell 8 of the container 2 is to be understood by the container length. Reinforcing ribs 7 can additionally be arranged on the container casing 2a. The lower edge of the container shell 2a forms an outwardly directed collar 10 which rests on the lid 3. Between the lid 3 and the lower edge of the container shell 2a, a sealing element 6 is arranged. The lid 3 may be held together with the container 2 in the region of the collar 10 by means of screws. Also conceivable are other holding means with which the lid 3 with the container 2 fixed, and again releasable held together, such as by means of a metal sleeve or a clamping ring of a flange. In another embodiment, the pressure-tight and pressure-resistant connection between the lid 3 and the container 2 by means of a plastic-compatible plug / snap connection or a screw connection can be made. In the screw connection, a thread is advantageously arranged on the outside in the region of the collar 10, onto which the cover 3, which has a correspondingly arranged internal thread, can be screwed on. It is also conceivable that arranged on the inner wall of the container 2 in the region of the collar 10, a thread into which the lid 3, which has a correspondingly arranged external thread, can be screwed. The thickness of the lid 3 is about 7 mm. Due to the insulating properties of the plastic, a thermal insulation is unnecessary in the case of the wall thicknesses of the boiler 1 mentioned above and allows a better heat utilization of the heating. The two parts of the boiler 1, the container 2 and the lid 3 are made by means of injection molding tools. As a result, the surfaces of the boiler 1 are very smooth and the water-wetted inner surface of the boiler 1 compared to metallic systems much less susceptible to adhering dirt particles and calcification. The smooth outer surface of the plastic container has a lower radiation compared to metal boilers or against rib-reinforced boilers whose surface is enlarged by the ribs, which also has a positive effect in terms of heat utilization. On the cover 3, the heating element connections 5 for the arranged inside the boiler 1 heater 9, as well as the inlet and outlet guide 4,11 of the water are further to recognize. These connections can be formed by means of simply injection-molded tubes and can be arranged both in the cover 3 and in the container 2 or in the region of the spherical shell 8. Other devices such as thermostat, thermometer and level probe are arranged on easy to be made connections either on the lid 3 or 2 on the container. The heating takes place via a tubular heater 9, which extends over several turns and almost over the entire length of the container in order to be able to deliver the heat distributed as possible over the entire volume of the water. When using the boiler housing 1 as a steam boiler this is only partially filled with water, the residual volume takes the steam room. The heater 9 is arranged for this purpose in the interior of the boiler 1 with vertical boiler use between the lid 3 and the spherical shell 8 such that the heater 9 is completely under water. Due to the good insulation properties of the plastic is less heat radiation from the boiler 1 than from metal or rib-reinforced boilers, whereby the boiler 1 can be operated both for hot water production as well as for steam generation with lower heat output.
[0007] Beim beschriebenen Boiler 1 besteht sowohl der Deckel 3 wie auch der Behälter 2 aus dem selben Kunststoff wie beispielsweise Polysulfon (PSU) oder Polyamid (PA). Denkbar ist aber auch, dass der Deckel 3 und der Behälter 2 aus verschiedenen Kunststoffen gefertigt sind. Der Vorteil von Polysulfon ist neben den bereits genannten Vorteilen, dass der Kunststoff bei den verwendeten Wandstärken durchsichtig ist. Dies ermöglicht die Einsicht in das Innere des Boilers 1.When boiler 1 described both the lid 3 as well as the container 2 made of the same plastic such as polysulfone (PSU) or polyamide (PA). It is also conceivable that the lid 3 and the container 2 are made of different plastics. The advantage of polysulfone, in addition to the advantages already mentioned, that the plastic is transparent at the wall thicknesses used. This allows insight into the interior of the boiler 1.
[0008] Der Kunststoffboiler für den Einsatz in Kaffeemaschinen weist eine Reihe von Vorteilen gegenüber herkömmlichen Metallboilern auf. Anschlüsse und Durchführungen für Wasserzu- und Abführung bzw. Dampfabführung können schon bei der Herstellung des Behälters 2 und Deckels 3 berücksichtigt werden, was eine vereinfachte Nachbearbeitung und Montage mit sich bringt. Weiter resultiert durch die geringere Dichte des Kunststoffs gegenüber Stahl eine Gewichtseinsparung von fast 50%. Diese Gewichtseinsparung nützt beim Transport und hilft damit auch Transportkosten zu sparen. Aufgrund der glatten Innenwand des Kunststoffboilers bilden sich weniger Kalkablagerungen gegenüber Metallwandungen. Durch die grossere Wärmeausdehnung des Kunststoffes gegenüber metallischen Körpern splittert der sich allenfalls an der Wandung gebildete Kalk besser ab und kann leicht ausgespült werden. The plastic boiler for use in coffee machines has a number of advantages over conventional metal boilers. Connections and Feedthroughs for water supply and discharge or steam discharge can be taken into account already in the production of the container 2 and lid 3, which brings a simplified post-processing and assembly with it. Furthermore, the lower density of the plastic compared to steel results in a weight saving of almost 50%. This weight saving benefits during transport and thus helps to save transport costs. Due to the smooth inner wall of the plastic boiler less calcium deposits form against metal walls. Due to the greater thermal expansion of the plastic compared to metallic bodies, the lime formed at most on the wall shatters better and can be easily rinsed out.

Claims

Patentansprüche claims
1. Boiler zum Erhitzen von Wasser für eine Kaffee- oder Espressomaschine mit einer innenseitig angeordneten Heizeinrichtung (9) und mit Anschlüssen für Kaltwasserzulauf (4) und Warmwasser- oder Dampfauslauf (11), wobei der Boiler aus einem druckfesten Gehäuse (1) besteht, dadurch gekennzeichnet, dass das Boilergehäuse (1) aus einem aus Kunststoff gefertigten Behälter (2) und einem aus Kunststoff gefertigten Deckel (3) besteht, dass weiter der Behälter (2) mit dem Deckel (3) druckdicht und lösbar verbunden ist.1. Boiler for heating water for a coffee or espresso machine with an inside arranged heating device (9) and with connections for cold water inlet (4) and hot water or steam outlet (11), wherein the boiler consists of a pressure-resistant housing (1), characterized in that the boiler housing (1) consists of a container made of plastic (2) and a lid made of plastic (3) that further the container (2) with the lid (3) is pressure-tight and releasably connected.
2. Boiler nach Anspruch 1 , dadurch gekennzeichnet, dass der Behälter (2) einen zylindrisch oder leicht konisch geformten Behältermantel (2a) aufweist, der an seinem oberen Ende mit einer Kugelschale (8) abgeschlossen ist, und dass die Wandstärken von Deckel (3) und Behälter (2) eine Dicke zwischen 4 mm und 8 mm aufweisen.2. Boiler according to claim 1, characterized in that the container (2) has a cylindrical or slightly conically shaped container casing (2 a), which is closed at its upper end with a spherical shell (8), and that the wall thicknesses of the lid (3 ) and container (2) have a thickness between 4 mm and 8 mm.
3. Boiler nach Anspruch 2, dadurch gekennzeichnet, dass der Deckel (3) mit dem Behälter (2) mittels einer Schraubverbindung druckdicht und lösbar verbunden ist, derart, dass an der Aussenwand des Behälters (2) im Bereich eines Kragens (10) ein Gewinde angeordnet ist, auf welches der Deckel (3), der ein entsprechend angeordnetes Innengewinde aufweist, aufschraubbar ist.3. Boiler according to claim 2, characterized in that the lid (3) with the container (2) by means of a screw pressure-tight and releasably connected, such that on the outer wall of the container (2) in the region of a collar (10) Thread is arranged, on which the lid (3), which has a correspondingly arranged internal thread, can be screwed.
4. Boiler nach Anspruch 2, dadurch gekennzeichnet, dass der Deckel (3) mit dem Behälter (2) mittels einer Schraubverbindung druckdicht und lösbar verbunden ist, derart, dass an der Innenwand des Behälters (2) im Bereich eines Kragens (10) ein Gewinde angeordnet ist, in welches der Deckel (3), der ein entsprechend angeordnetes Aussengewinde aufweist, einschraubbar ist. 4. Boiler according to claim 2, characterized in that the lid (3) with the container (2) by means of a screw pressure-tight and releasably connected, such that on the inner wall of the container (2) in the region of a collar (10) Thread is arranged, in which the lid (3), which has a correspondingly arranged external thread, can be screwed.
5. Boiler nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Anschlüsse für die Zu- und Wegführung (4,11) des Wassers bzw. des Dampfes über am Deckel (3) oder am Behälter (2) angespritzte Rohre erfolgt.5. Boiler according to one of the preceding claims, characterized in that the connections for the supply and removal (4,11) of the water or the steam on the lid (3) or on the container (2) molded tubes takes place.
6. Boiler nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Deckel (3) und der Behälter (2) aus Polysulfon (PSU) gefertigt sind.6. Boiler according to one of claims 1 to 5, characterized in that the lid (3) and the container (2) made of polysulfone (PSU) are made.
7. Boiler nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Deckel (3) und der Behälter (2) aus Polyamid (PA) gefertigt sind.7. Boiler according to one of claims 1 to 5, characterized in that the lid (3) and the container (2) made of polyamide (PA) are made.
8. Boiler nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die die Heizeinrichtung (9) durch einen Rohrheizkörper gebildet ist, und dass sich die Heizeinrichtung (9) über nahezu die ganze Länge des Behälters (2) erstreckt.8. Boiler according to one of the preceding claims, characterized in that the heating device (9) is formed by a tubular heater, and that the heating device (9) over almost the entire length of the container (2).
9. Boiler nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Abstand vom Deckel (3) bis zur Kuppe der Kugelschale (8) des Behälters (2) zwei bis drei mal grösser als der Durchmesser des Behälters (2) ist. 9. Boiler according to one of the preceding claims, characterized in that the distance from the cover (3) to the top of the spherical shell (8) of the container (2) is two to three times larger than the diameter of the container (2).
PCT/CH2008/000048 2007-02-13 2008-02-08 Boiler for heating water and generating water vapor WO2008098391A1 (en)

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CH236/07 2007-02-13
CH2362007 2007-02-13

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009046550A2 (en) * 2007-10-08 2009-04-16 Egro Coffee Systems Ag Boiler for heating water in coffee machines

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2951866A1 (en) * 1979-12-21 1981-07-02 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Electric filtered coffee maker - has fresh water container and heating chamber side by side preventing cold water being fed to filter
WO2001020231A1 (en) * 1999-09-15 2001-03-22 Emerson Electric Co. One-piece plastic tank and temperature control system for a hot water dispenser
DE102005026919A1 (en) * 2005-06-10 2007-02-01 Bleckmann Gmbh & Co. Kg Boiler for heating flow capable medium e.g. water, has heater with unheated end inside housing, and mounting opening fixed in housing in a manner that its inner diameter corresponds to outside diameter of heater

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2951866A1 (en) * 1979-12-21 1981-07-02 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Electric filtered coffee maker - has fresh water container and heating chamber side by side preventing cold water being fed to filter
WO2001020231A1 (en) * 1999-09-15 2001-03-22 Emerson Electric Co. One-piece plastic tank and temperature control system for a hot water dispenser
DE102005026919A1 (en) * 2005-06-10 2007-02-01 Bleckmann Gmbh & Co. Kg Boiler for heating flow capable medium e.g. water, has heater with unheated end inside housing, and mounting opening fixed in housing in a manner that its inner diameter corresponds to outside diameter of heater

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009046550A2 (en) * 2007-10-08 2009-04-16 Egro Coffee Systems Ag Boiler for heating water in coffee machines
WO2009046550A3 (en) * 2007-10-08 2009-08-13 Egro Coffee Systems Ag Boiler for heating water in coffee machines
US8515268B2 (en) 2007-10-08 2013-08-20 Egro Coffee Systems Ag Boiler for heating water in coffee machines

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