DE1454231B2

DE1454231B2 - Coffee machine for the individual preparation of predetermined amounts of drinking coffee with a brewing water and a steam pressure boiler

Info

Publication number: DE1454231B2
Application number: DE19641454231
Authority: DE
Inventors: Siegfried 7341 Bad überkingen. A47j 43-14 Anderl
Original assignee: Württembergische Metallwarenfabrik, 7340 Geislingen
Priority date: 1964-12-17
Filing date: 1964-12-17
Publication date: 1970-06-11
Also published as: AT285085B; DE1454231A1

Description

1 21 2

Die Erfindung betrifft eine Kaffeemaschine zur Trockengehschutz wirken. Bei einer vorteilhaften Einzelbereitung vorbestimmter Trinkkaffeemengen Weiterentwicklung ist die Steuerung derartig einmit einem z. B. elektrisch beheizbaren Brühwasser- gestellt, daß nach dem Herausdrücken des Brühwaskessel, der eine Brühvorrichtung mit auf Brühtempe- sers aus dem Brühwasserkessel noch eine zum Trockratur erhitztem Frischwasser speist und einen z. B. 5 nen des in der Brühkammer verbleibenden Kaffeeelektrisch beheizbaren Dampfdruckkessel, der den satzes ausreichende Dampfmenge nachströmt. Bei Brühwasserkessel über eine durch ein Ventil absperr- einer bevorzugten Ausführungsform der erfindungsbare Treibdampfleitung mit Treibdampf speist. gemäßen Kaffeemaschine, die besonders wirtschaft-Es ist eine derartige Kaffeemaschine bekannt, bei lieh arbeitet, wird dies dadurch erreicht, daß das Ander das Ventil in der Treibdampfleitung von Hand ίο Sprechniveau des Niveaufühlers im Brühwasserkessel betätigbar und bei Normalbetrieb geschlossen ist. Der zum Schließen des Absperrventils etwa in dem Niveau Brühwasserkessel ist bei der bekannten Kaffee- der Einmündung des zur Brühkammer führenden maschine als Druckboiler ausgebildet. Das Brüh- Steigrohres liegt. Vorteilhaft kann die Steuerung Mitwasser wird in ihm ständig auf Brühtemperatur ge- tel zum verzögerten Schließen des Absperrventils halten und der Brüheinrichtung normalerweise mit 15 nach dem Ansprechen des Niveaufühlers im Brüheinem Druck zugeführt, der dem Druck im Wasser- wasserkessel enthalten, die auf eine zum Trocknen leitungsnetz entspricht. In Ausnahmefällen, nämlich des Kaffeesatzes ausreichende Dampfmenge abwenn der Druck im Wasserleitungsnetz so stark ab- gestimmt sind.The invention relates to a coffee machine to protect against dry running. With an advantageous Individual preparation of predetermined amounts of drinking coffee, further development, is the control in such a way a z. B. electrically heated brewing water provided that after pressing out the brewing water boiler, the one brewing device with a brewing tempe- rer from the brewing water boiler and another one for drying heated fresh water and a z. B. 5 NEN of the coffee remaining in the brewing chamber electrically heatable steam pressure boiler, which flows after the set sufficient amount of steam. at Brewing water boiler via a shut-off by a valve, a preferred embodiment of the invention Motive steam line feeds with motive steam. appropriate coffee machine, the particularly economical-es such a coffee machine is known to work at borrowed, this is achieved in that the other the valve in the motive steam line by hand ίο speaking level of the level sensor in the brewing water boiler can be actuated and is closed during normal operation. The one to close the shut-off valve at about the same level In the known coffee machine, the brewing water boiler is the confluence of the one leading to the brewing chamber machine designed as a pressure boiler. The brewing riser is located. The Mitwasser control can be advantageous it is constantly brought up to the brewing temperature to delay the closing of the shut-off valve hold and the brewing device normally with 15 after the level sensor in the brewing unit has responded Pressure supplied to the pressure contained in the water boiler, which is applied to dry line network corresponds. In exceptional cases, namely remove sufficient steam from the coffee grounds the pressure in the water supply network is so closely coordinated.

fällt, daß kein ausreichender Brühdruck zur Ver- In der Zeichnung ist die Erfindung in zwei Ausfügung steht, kann das Ventil in der Treibdampf- 20 führungsformen beispielsweise veranschaulicht,
leitung von Hand geöffnet und der Dampf aus dem F i g. 1 zeigt schematisch eine Kaffeemaschine geDampf druckkessel zum Erzeugen des notwendigen maß der Erfindung mit einem Brühwasser-und einem Brühdruckes benutzt werden. Die bekannte Kaffee- Treibdampfkessel;In the drawing, the invention is in two versions, the valve in the motive steam can be illustrated, for example,
line opened by hand and the steam from the Fig. 1 shows schematically a coffee machine. Steam pressure vessel can be used to generate the necessary level of the invention with a brewing water and a brewing pressure. The well-known coffee motive steam boiler;

maschine weist verschiedene Nachteile auf. Insbeson- F i g. 2 zeigt einen Ausschnitt aus dem Brühwas-machine has several disadvantages. In particular, F i g. 2 shows a section from the brewing water

dere muß beim Einleiten eines Brühvorganges der 25 serkessel mit einem als Elektrode ausgebildetenwhich must be designed as an electrode when initiating a brewing process of the 25 boiler

Druck im Brühwasserkessel geprüft und bei Bedarf Niveaufühler;Pressure in the brewing water boiler checked and level sensor if necessary;

das Ventil in der Treibdampfleitung von Hand ge- F i g. 3,4 und 5 zeigen eine elektrische Schaltung öffnet werden. Das Ventil muß auch von Hand wie- in drei charakteristischen Schaltstellungen während der geschlossen werden, was ebenfalls eine Über- des Betriebes der Kaffeemaschine, und
•wachung des Druckes im Brühwasserkessel erforder- 30 F i g. 6 zeigt schematisch eine Variante der Kaffeelich macht. Bei der bekannten Kaffeemaschine wird maschine nach Fig. 1.the valve in the motive steam line by hand. 3, 4 and 5 show an electrical circuit to be opened. The valve must also be closed by hand in three characteristic switching positions during the, which also over- the operation of the coffee maker, and
• The pressure in the brewing water tank must be monitored. 30 F i g. 6 schematically shows a variant of the coffee teaspoon. In the known coffee machine, the machine according to FIG. 1.

übrigens im Brühwasserkessel ständig Wasser von Die Kaffeemaschine hat einen Dampfdruckkessel 1 Brühtemperatur vorrätig gehalten, was zur Folge hat, und einen Brühwasserkessel 2. Beide Kessel sind an daß der Kaffee häufig mit abgestandenem Wasser eine Frischwasserleitung 3, im allgemeinen also an aufgebrüht wird. 35 das zur Verfügung stehende Wasserleitungsnetz anAufgabe der Erfindung ist es, eine Kaffeemaschine schließbar.Incidentally, there is always water from the brewing water boiler. The coffee machine has a steam pressure boiler 1 Brewing temperature kept in stock, which has the consequence, and a brewing water boiler 2. Both boilers are on that the coffee often with stale water a fresh water line 3, so generally on is brewed. The object of the invention is to close a coffee machine.

der eingangs beschriebenen Art so auszubilden, daß Der Dampfdruckkessel 1 wird von einem elektridie Treibdampfleitung selbsttätig zu Beginn eines sehen Heizkörper 9, der Brühwasserkessel 2 von Brühvorganges geöffnet und am Ende wieder ge- einem elektrischen Heizkörper 10 beheizt. Die Heizschlossen wird, ohne daß Wasser von Brühtempera- 40 körper 9 und 10 sind über ein elektrisches Schalttur ständig im Vorrat erhalten werden muß. und Steuergerät 11, welches nur schematisch an-Die Aufgabe wird erfindungsgemäß dadurch ge- gedeutet ist, an eine Stromquelle bzw. an das eleklöst, daß das Absperrventil in der Treibdampfleitung trische Netz bei 12 angeschlossen. Ein Schalter 13 selbsttätig in der Weise gesteuert wird, daß ein von dient zur Einschaltung und Inbetriebnahme der. der Temperatur des Brühvvassers im Brühwasserkes- 45 Kaffeemaschine bzw. zur Abschaltung des Gerätes,
sei beeinflußter Wärmefühler über eine Schaltanlage Aus dem Brühwasserkessel 2 führt ein Steigrohr das Absperrventil beim Erreichen der Brühwasser- 16, dessen Einmündung 17 im unteren Teil des Kes-Solltemperatur öffnet und ein von der Wasserstands- selraumes liegt, zu einer Brühvorrichtung 18, die das höhe im Brühwasserkessel beeinflußter Niveaufühler Kaffeepulver aufnimmt und aus der das fertige Brühbeim Absinken des Brühwasserspiegels auf die Ent- 50 getränk entnommen wird.The steam pressure boiler 1 is automatically opened by an electric motive steam line at the beginning of a heating element 9, the brewing water boiler 2 is opened by the brewing process and is heated again at the end by an electric heating element 10. The heating closures are without water from the brewing temperature bodies 9 and 10 having to be kept constantly in stock via an electrical switchgear. and control unit 11, which is only indicated schematically in accordance with the invention, to a power source or to the electrical system connected to the shut-off valve in the motive steam line at 12. A switch 13 is automatically controlled in such a way that one of is used to switch on and start up the. the temperature of the brewing water in the brewing water 45 coffee machine or to switch off the device,
be influenced heat sensor via a switchgear From the brewing water boiler 2, a riser pipe leads the shut-off valve when the brewing water 16 is reached, the confluence 17 of which opens in the lower part of the boiler set temperature and one of the water level is located, to a brewing device 18, which is the height The level sensor influenced in the brewing water tank picks up coffee powder and from which the finished brew is taken when the brewing water level drops to the ent drink.

leerungsgrenze das Absperrventil schließt. Der obere Teil des Brühwasserkessels 2 ist über Durch das selbsttätige Öffnen und Schließen des eine Treibdampfleitung 19 mit dem oberen Teil des Absperrventils wird das Bedienungspersonal ent- Dampfdruckkessels 1 verbunden. Bei der Ausfühlastet, da es den Druck im Brühwasserkessel nicht rungsform gemäß F i g. 1 wird hierfür teilweise die beaufsichtigen muß. Darüber hinaus wird gewähr- 55 Abzweigleitung 7 der Frischwasserleitung 3 benutzt, leistet, daß das jedesmal neu eingefüllte und unmit- Bei der Ausführungsform gemäß F i g. 6 ist die Treibtelbar vor dem Aufbrühen auf Brühtemperatur er- dampfleitung 19 von der Frischwasserleitung 7 gehitzte Wasser auch wirklich mit dieser richtigen trennt gehalten. In jedem Falle ist in die Treibdampf-Brühtemperatur der Brühvorrichtung zugeführt wird. leitung 19 ein Absperrventil 20 eingebaut, welches Das selbsttätige Schließen des Absperrventils garan- 60 z. B. von einem Elektromagneten 21 od. dgl. betätigt tiert die ständige Betriebsbereitschaft und die Be- werden kann, der über das Schalt- und Steuergerät triebssicherheit der erfindungsgemäßen Kaffee- 11 mit Strom aus dem Netz gespeist wird,
maschine. Druckschwankungen in der Wasserleitung Γη den Dampfdruckkessel 1 ist ein Druckfühler haben auf den ordnungsgemäßen Ablauf des Brüh- oder Pressostat 22 eingebaut, welcher an das Schaltvorganges keinen Einfluß. 65 und Steuergerät 11 angeschlossen ist und dafür sorgt, Vo"tei!!;·aft kann der Wärmefühler beim Öffnen daß der erforderliche Dampfdruck im Kessel 1 sclbstcic.5 Absperrventils auch die Stromzufuhr zum Heiz- tälig eingehalten wird. Ein ebenfalls in den Kessel 1 körper des Brühwasserkcssels unterbrechen, d. h. als eingebauter und an das Schalt- und Steuergerät 11emptying limit the shut-off valve closes. The upper part of the scalding water boiler 2 is connected to the operating personnel via the automatic opening and closing of a motive steam line 19 with the upper part of the shut-off valve. During the execution load, since the pressure in the scalding water boiler is not approximate according to FIG. 1 will have to supervise in part for this. In addition, the branch line 7 of the fresh water line 3 is used, which ensures that the fresh water that is filled in each time and immediately afterwards. 6, the Ttriebelbar is actually kept separated from the fresh water line 7 with water heated to the fresh water line 7 before it is brewed to the brewing temperature. In any case, the motive steam brewing temperature is supplied to the brewing device. line 19 installed a shut-off valve 20, which The automatic closing of the shut-off valve guaranteed 60 z. B. actuated by an electromagnet 21 or the like. The constant operational readiness and the loading can be, which is fed via the switching and control device operational safety of the coffee 11 according to the invention with electricity from the network,
machine. Pressure fluctuations in the water line Γη the steam pressure boiler 1 is a pressure sensor built into the proper flow of the brewing or pressostat 22, which has no influence on the switching process. 65 and control unit 11 is connected and ensures that when the heat sensor is opened, the required steam pressure in boiler 1 is also maintained interrupt the body of the brewing water tank, ie as a built-in device and to the switching and control device 11

Claims

3 43 4

The connected heat sensor 23 serves as a drying pipe 16. At the latest when this escape protection is reached, emptying limit now causes the level sensor system,

The brewing water boiler 2 is a loading and Ent- in the exemplary embodiment, the sensing electrode 26

ventilation valve 24 provided, which automatically closes the shut-off valve 20 to the other

ensures that when fresh water is filled, the air 5 flows into the scalding water boiler 2

escapes from the boiler and prevents air from flowing in. This switching process is according to

can, if the supply of motive steam according to Schlie- the embodiment is brought about that

ßung of the shut-off valve 20 stops, while it is the liquid contact of the sensing electrode 26 at

closes when motive steam flows into boiler 2. The water level drops below level A.

In the brewing water boiler 2 there is also a thermal break (FIG. 2). The circuit is thereby fully sensing system, for example a heat sensor 25, and continuously interrupted, so that both the electrical level sensing system, for example a sensing magnet 21 closes the shut-off valve 20 and the electrode 26 is installed. The heat sensor 25 regulates the heating element 10 is or remains de-energized. This switching temperature of the brewing water in the boiler 2 and controls and operating state is in F i g. 5 illustrates, at the same time, the shut-off valve 20. The level sensing element 15 This completes the brewing process. If necessary, the trode 26 also controls the shut-off valve 20 and a further brewing process can now be initiated also serves as a dry boil protection for the heating after the brewing water boiler 2 is back with the body 10 of the brewing water boiler. Both sensing systems have been filled with fresh water and the brewing device 18, 25 and 26 have been fed with coffee powder to the switching and control device 11.
closed. Instead of a sensing electrode 26, a float control or the like could also be used, so that after the brewing device has been pushed out, which is suitable for switching water out of the brewing water boiler 2. A certain amount of steam can flow in to reduce the amount of steam in the

The operation of the brewing device described above, remaining moist coffee grounds too

Coffee machine is the following: 25 dry. According to the illustrated embodiment

Through the line 4 fresh water is in the game, the response level A of the steam pressure boiler Γ is let in for this purpose. After the stream. 'Sense electrode 26 has been placed a little higher than that is turned on by actuating the switch 13, level B of the junction 17 of the riser pipe 16. It is the water in the boiler 1 through the radiator 9 has shown that after the closing heats until the required and from the pressostat 22 30 ßung of the shut-off valve 20 still in the Brühwasregel.e steam pressure in the boiler 1 is reached. Boiler 2 and in the lines driving purpose for the preparation of coffee is only expanded so much at the time of steam that it not only pushes out the actual need for the desired borne water through the riser 16, the amount of fresh water required in the but also a sufficient amount of brewing water boiler 2 has been filled. The level sensing element 35 steam for drying the coffee grounds in the brewing electrode 26 is immersed in the water and causes the device 18 to deliver. By corresponding counterpart F i g. 3 the closure of the circuit in which the level positions A and B can be assigned to the radiator 10. The heat sensor 25, the most favorable relationship between emptying its switch is in the same circuit, initially keeps the state and closure of the shut-off valve 20 also closed the circuit. Be put in 40.

consequently, the shut-off valve 20 is in the driving According to another, not shown

Steam line 19 also closed. If the desired 'embodiment to achieve the coffee grounds drying

The switching and control device 11 can control the temperature of the fresh or brewing water in the brewing with a

water boiler 2 is reached, causes the heat sensor delay device, z. B. a delay

25 a shutdown of the radiator 10 and a relay 45 are provided, which ensures that from

Opening of the shut-off valve 20. Now the driving response of the sensing electrode 26 or the like flows up to the

steam through the motive steam line 19 from the division of the switchover command to the electromagnetic

Steam pressure boiler 1 in the upper space of the brew 21 of the shut-off valve 20 for a certain time

kettle 2 and presses the brewing water through, which is sufficient to continue after emptying the

the riser 16 in the brewing device 18 and 50 brewing water from the brewing water boiler 2 another

thanks to the coffee powder in it, there is sufficient steam to dry the

by. The ventilation valve will allow 24 coffee grounds to flow in,
automatically, e.g. B. by an electromagnetic or

temperature-sensitive or flow-dependent claims:

or similar device, closed to allow a 55

This valve should be used to prevent the 1. Prevent coffee machine for individual preparation. This circuit and operating state is certain amounts of drinking coffee with a z. B. in Fig. 4 shown schematically. It should be noted, electrically heated brewing water boiler, the one that, for the sake of simplicity, the switches are shown with the brewing device heated to the brewing temperature are that it feeds the circuits directly through 60 system fresh water and a z. B. electrical switch the action of the sensors. Of course, heatable steam pressure boiler, which makes the brewing Hch The circuits can also be operated indirectly via the boiler via a valve shut-off relay which feeds the motive steam line with motive steam, which can be set up by the sensor, Hung to be controlled. characterized in that the Ab-Da the water level in the brewing water boiler 2 65 shut-off valve (20) in the motive steam line (19) during the emptying of the brewing water under which is automatically controlled in such a way that a Effect of the Trcibdarnpfes decreases, it reaches the temperature of the brewing water in the brewing finally the lower junction 17 of the riser boiler (2) influenced heat sensor (25)

the shut-off valve (20) via a switchgear when the brewing water target temperature is reached opens, and a level sensor influenced by the water level in the brewing water boiler (2) (26) when the brewing water level drops to the emptying limit, the shut-off valve (20) closes.

2. Coffee machine according to claim 1, characterized in that the heat sensor (25) when Open the shut-off valve (20) and the power supply to the heating element (10) of the brewing water boiler (2) interrupts.

3. Coffee machine according to claim 1 or 2, characterized in that the controller such it is set that after the brewing water has been pressed out of the brewing water boiler (2) another sufficient to dry the coffee grounds remaining in the brewing chamber (18) Amount of steam flows in.

4. Coffee machine according to claim 3, characterized in that the response level (A) of the level sensor (26) in the brewing water boiler (2) for closing the shut-off valve (20) approximately in the level (B) of the confluence (17) of the brewing chamber (18) ) leading riser pipe (16) is located.

5. Coffee machine according to claim 3 or 4, characterized in that the control means for delayed closing of the shut-off valve (20) after the level sensor has responded (26) in the brewing water boiler (2).

1 sheet of drawings