DE2645684A1 - Coffee maker with hot water and steam brewing - has riser pipe with adjustable opening to regulate ratio of steam to water - Google Patents

Abstract

The heating system is for household coffee makers. A U-shaped riser pipe is located inside the air-tight fresh water vessel, and together with the close-fitting welded heating element, fits under a metal cap in a metal sleeve which is sealed in air-tight manner at the top. This sleeve can be opened at the bottom to a variable spacing from the upper edge of the hollow riser pipe which produces the steam or has one or more openings so that the ratio of steam to brewing water can be altered as required. The water inside the metal sleeve is brought to boiling point and forms a steam atmosphere which forces down the inner water level. A removable insert pipe is fitted on which the chalk deposits can build up. The pipe can then be easily removed for cleaning.

Description

Brewing water delivery systems for coffee machines PorFRtZa- This supplement to patent application P 26 22 425.9 relates to a further embodiment of a heating and brewing water delivery system for electrical household coffee machines with a fresh water storage vessel that can be closed airtight.

According to the invention, this embodiment also offers in a simple manner the possibility of a brewing water / steam mixture with constant electrical heating power to produce, its ratio of brewing water to steam content and its brewing water temperature can be set at will up to the absolute boiling point.

This particularly facilitates the subsequent adjustment of the heating system, if you want a maximum extraction of the coffee grounds with the help of steam in a reasonable Want to achieve time.

Previously known heating systems also promote a mixture of scalding water and steam, its quantitative ratio, however, once the design of the heating system has been specified can only be influenced by changing the electrical heating power, nevertheless but cannot guarantee that the scalding water supplied has an absolute boiling point because some of the steam generated is not yet completely at the boiling point expels heated water.

Furthermore, this new embodiment of the heating system offers according to the invention the advantage of using a removable insert on which limescale residues which arise during evaporation, can be separated. This can then from time to time Time to be cleaned separately.

Because the new heating system is firmly attached to the fresh water storage vessel can be connected, which has a handle that this turns out to be separate Unit, e.g. separated from a device base with coffee filter and coffee pot, under the tap through the brewing water steam discharge opening itself or through can fill a separate, hermetically sealable filler neck is also an operating advantage achieved.

In wle Z f5. is this new embodiment of the Heizungssysteis shown schematically in cross section.

Inside the fresh water storage vessel, which can be closed airtight (1) there is a U-shaped bent riser pipe (2) in which the brewing water Da-pf-Ge-isch is generated because it has a tight-fitting, double-loop tubular heating element (3) is re-soldered. Riser pipe (2) and tubular heating element (3) are located within one Metal sleeve open at the bottom (4), which is airtight at the top with a lid (5) is locked. This metal sleeve (4) contains the setting of the brewing water / steam ratio at a freely selectable distance from the upper edge of the U-shaped riser pipe bend (2) or several openings (7). There is another one around this metal sleeve Sleeve made of heat-insulating material (6), for example. Made of silicone rubber, which above and is open at the bottom.

When the heater is in operation, the inside of the oil-metal sleeve (4) becomes Bring water (11) to the boil and forms a steam atmosphere (9), which the inner water level (8) when the storage vessel (1) is full up to the openings (7) pushes down. Then the steam exits through the openings (7), rising without much Loss of heat to the outer water surface (10) and condenses there. He warms up thereby - according to the 1st patent claim of the application dated 05/17/76 No. P 26 22 425.9 - Because of the low convection, the water surface (10) is much faster than the remaining water volume (12), so that the steam atmosphere as early as possible (13) can achieve sufficient steam pressure to start pumping water holds.

When pumping water, the water supply (lt) then becomes a proportion of water that has already been brought to boiling temperature through the opening (14) into the Riser pipe (2) pressed. It then rises through the upper half of the riser pipe (2), that with the tubular heating element (3) there is now unwetted only in a steam atmosphere (9) and thus the evaporation process due to the concentrated heating output fully or partially, depending on how deep the inner water level (8) is the choice of openings (7) has been set.

At the culmination point of the riser pipe (2) there is a small one Opening (15) which has a double function.

Already at the beginning of the cooking process, as soon as the inner water level (8) is depressed so far that the opening (15) is exposed, part of the steam already pushed out through it and to the brewing water steam ejection opening (16) and can be used for coffee extraction. Towards the end of the cooking process, when that outer The water level (10) drops below the level of the openings (7) and thus the unwetted one Part of the riser pipe (2) through drs now also with falling inner water level (8) now unfolds a more concentrated heating power, pushes through this opening (15) the damaged generated steam in the opposite direction back into the chamber (9) and thus helps to drive the brewing water faster through the riser pipe (2). This retel process changes (ks ratio of ejected amount Steam to brew water when exiting the opening (16) is not too much in favor of the Steam content.

The lower loop of the tubular heater (17) is with the metal bottom of the fresh water storage vessel (1) is soldered and thus helps through its deep position, Boil away the remaining water quickly and then quickly enough heating up the copper tab (17) to which a temperature monitor for safety shutdown of the electrical Heating power sits.

From below you can enter through the brewing water steam discharge opening (16) closely fitting second metal tube (18) with many small holes and a handpiece (19), on which the lime separation takes place preferentially, if the heating power is particularly concentrated at the point (20) of the tubular heating element.

Explanation of symbols: (1) Fresh water storage vessel (2) Brewing water steam delivery pipe (3) Tubular heating element (4) Metal sleeve (diving corner) (5) Metal sleeve on top, airtight closed (6) heat-insulating jacket, open at the top and bottom (7) steam outlet openings in the metal sleeve (4) (8) inner water level (9) inner daspfathmosphäre (10) outer water level (11) inner water volume (12) outer water volume (130 outer Dampfathmesphere (14) inlet opening of the scalding water steam generating hollow body (2) (15) Regulation opening at the culmination point of (2) (16) Brewing water steam outlet opening (17) Lower heating loop of the tubular heating element (3) with copper tab on the temperature monitor To switch off the electrical heating output, there is a (18) metal insert on which there is limescale residue separate inside the heating system, pull-out (19) handpiece (20) reinforced Heating power in the tubular heater (3) (21) power cord (22) waterproof space for the egg. Wiring (23) Handle (24) Water filler neck (25) pipette head-shaped Rubber stopper L e r s e i t e

Claims (7)

- Zusi * iiohc Claims: 4 heating systems for household coffee machines with fresh water storage vessel to be closed airtight, characterized in that siebeteanldug No. P 26 22 425.9 from May 17, 1976 -.- lliz-n0-ygt- rh f-d) adtnLeit -Identified that it is located within the fresh water supply. Scalding water steam generating hollow body (2) this together with the tightly fitting, soldered heating element (3) under a metal cap - similar to a diving bell - e.g. in a metal sleeve (4), which is airtight at the top, but at the bottom depending on the desired ratio from the amount of brewing water generated to the amount of steam from a selectable distance ron the upper edge of the brewing water steam generating hollow body (2) is open or has one or more openings there. 2. Heating systems according to claim 1, characterized in that the Scalding water steam generating hollow body (2) at the upper culmination point one to Has a regulation opening (15) measuring 3 mm in diameter. 3. Heating systems according to claim 4, characterized in that in order the Netallkappe (4) around a jacket made of heat-insulating. Material (6) attached that is open at the top and bottom and does not fit too closely to the metal cap, so that there is still enough space in between for rising vapor bubbles. Heating systems according to claim 1, characterized in that at least a loop (17) of the tubular heater (3) close to the bottom of the fresh water storage vessel is brought in, with the intention of boiling away the remaining water quickly and possibly removing it. is connected to this in order to then have good heat conduction to the temperature monitor to ensure. 5. Heating systems according to claim 1, characterized in that the Heating system with the fresh water storage vessel, the watertight housing part forms a unit for the electrical connections (22) and a handle (23), that they - separate from the rest of the coffee machine consisting of coffee filters and coffee pot - can be filled directly under the tap. 6. Heating systems of coffee machines, characterized in that any metal insert, e.g. a close-fitting metal sleeve (18) with holes can be pushed in so far, that the lime residue that forms within the heating system is deposited on it and can be pulled out with the insert for separate cleaning 7th The claim should not only apply to heating systems for fresh water storage vessels that can be sealed airtight be limited, but have general validity.