초록 ▼

The invention relates to an apparatus for preparing a coffee extract with a fine-bubble froth layer, provided with at least one inlet ( 2 ) to which coffee extract is supplied, at least one outlet ( 4.1; 4.2 ) for dispensing the coffee extract with the fine-bubble froth layer and at least one liquid

The invention relates to an apparatus for preparing a coffee extract with a fine-bubble froth layer, provided with at least one inlet ( 2 ) to which coffee extract is supplied, at least one outlet ( 4.1; 4.2 ) for dispensing the coffee extract with the fine-bubble froth layer and at least one liquid flow path ( 6 ) extending from the at least one inlet to the at least one outlet ( 2 ) and along which, in use, the coffee extract flows from the at least one inlet to the at least one outlet ( 4.1; 4.2 ), while in the at least one liquid flow path a buffer reservoir is included with an upright sidewall and a bottom, the at least one inlet being provided with at least one spout opening for generating at least one coffee extract is supplied to the at least one inlet. According to the invention, in the buffer reservoir, a liquid flow decelerating barrier located at a distance from the upright sidewalls is included.

대표청구항 ▼

1. An apparatus for preparing a coffee extract with a fine-bubble froth layer, provided with at least one inlet to which coffee extract is supplied, at least one outlet for dispensing the coffee extract with the fine-bubble froth layer and at least one liquid flow path extending from the at least on

1. An apparatus for preparing a coffee extract with a fine-bubble froth layer, provided with at least one inlet to which coffee extract is supplied, at least one outlet for dispensing the coffee extract with the fine-bubble froth layer and at least one liquid flow path extending from the at least one inlet to the at least one outlet and along which, in use, the coffee extract flows from the at least one inlet to the at least one outlet, while in the at least one liquid flow path a buffer reservoir is included with an upright sidewall and a bottom, the at least one inlet being provided with at least one spout opening for generating at least one coffee extract jet which, in use, squirts into the buffer reservoir when the coffee extract is supplied to the at least one inlet, characterized in that in the buffer reservoir a liquid flow decelerating barrier located at a distance from the upright sidewalls is included. 2. An apparatus according to claim 1, characterized in that the liquid flow decelerating barrier is included between a central part of the buffer reservoir and the upright sidewalls, so that a liquid flow from the central part in the direction of the upright walls is limited. 3. An apparatus according to claim 2, characterized in that the at least one coffee extract jet is directed towards the central part. 4. An apparatus according to claim 3, characterized in that the buffer reservoir is provided with at least one liquid discharge path for discharging coffee extract from the buffer reservoir to the at least one outlet, the at least one liquid discharge path having its origin, viewed from the central part, outside the liquid flow decelerating barrier. 5. An apparatus according to claim 2, wherein the liquid flow decelerating barrier extends along a first closed curve, extending around the central part. 6. An Apparatus according to claim 5, characterized in that the liquid flow decelerating barrier further extends along a second closed curve, extending at a distance around the first curve. 7. An apparatus according to claim 1, wherein the liquid flow decelerating barrier is provided with a number of obstacles, located at a distance from one another, extending upwards from the bottom of the buffer reservoir. 8. An apparatus according to claim 7, characterized in that the obstacles are pin-shaped. 9. An apparatus according to claim 1, wherein the liquid flow decelerating barrier is provided with a gauze wall extending away from the bottom of the buffer reservoir. 10. An apparatus according to claim 1, wherein the bottom, at least partly, is provided with a roughened surface structure. 11. An apparatus according to claim 10, characterized in that the surface structure has a surface roughness corresponding to the surface roughness of sandpaper comprising parts with an average diameter of 50-2000 μm. 12. An apparatus according to claim 11, characterized in that the surface structure has a surface roughness corresponding to the surface roughness of sandpaper in the range of P12 to P600. 13. An apparatus according to claim 12, characterized in that the surface structure has a surface roughness corresponding to the surface roughness of sandpaper in the range of P60 to P300. 14. An apparatus according to claim 12, characterized in that the surface structure has a surface roughness-RA of 50-2000 μm. 15. An apparatus according to claim 14, characterized in that the surface structure has a surface roughness-RA of 50-200 μm. 16. An apparatus according to claim 10, wherein the bottom has been subjected to a spark treatment. 17. An apparatus according to claim 10, wherein the bottom has been sandblasted. 18. An apparatus according to claim 10, wherein the bottom has been chemically etched. 19. An apparatus according to claim 10, wherein on the bottom, a gauze is provided far obtaining the roughened surface structure. 20. An apparatus according to claim 1, wherein a normal of the bottom includes an angle A with the coffee extract jet which is smaller than 80 degrees. 21. An apparatus according to claim 20, characterized in that the normal of the bottom includes an angle A with the coffee extract jet which is approximately equal to 45 degrees. 22. An apparatus according to claim 20, characterized in that the normal of the surface includes an angle A with the coffee extract jet which is approximately equal to zero degrees. 23. An apparatus according to claim 1, wherein the apparatus is further provided with means for preparing the coffee extract and for supplying, under pressure, the coffee extract to the at least one inlet.