EP0000004A1 - Kontinuierlich arbeitende Filterzentrifuge zum Abscheiden, Waschen oder Entleeren, und Anwendung in einer automatischen Kaffeemaschine - Google Patents
Kontinuierlich arbeitende Filterzentrifuge zum Abscheiden, Waschen oder Entleeren, und Anwendung in einer automatischen Kaffeemaschine Download PDFInfo
- Publication number
- EP0000004A1 EP0000004A1 EP78100037A EP78100037A EP0000004A1 EP 0000004 A1 EP0000004 A1 EP 0000004A1 EP 78100037 A EP78100037 A EP 78100037A EP 78100037 A EP78100037 A EP 78100037A EP 0000004 A1 EP0000004 A1 EP 0000004A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- axis
- rotary
- cylindrical
- strap
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 32
- 238000005406 washing Methods 0.000 title claims abstract description 7
- 238000000926 separation method Methods 0.000 title claims abstract description 4
- 238000004804 winding Methods 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000000047 product Substances 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000007790 scraping Methods 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 238000009834 vaporization Methods 0.000 claims description 3
- 230000008016 vaporization Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 210000003414 extremity Anatomy 0.000 claims 1
- 239000012263 liquid product Substances 0.000 claims 1
- 238000004140 cleaning Methods 0.000 description 6
- 238000000227 grinding Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 241000533293 Sesbania emerus Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000000779 depleting effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000008241 heterogeneous mixture Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
- B04B3/08—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles by bowl walls in the form of endless bands
-
- 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
- A47J31/22—Centrifuges for producing filtered coffee
Definitions
- the invention relates to filtration in general, and more particularly to the preparation of coffee.
- the filtration operation in general consists in passing a liquid through a porous wall which retains solid particles, these solid particles possibly being previously contained in suspension in the liquid, in the case of filtration for separation. , or on the contrary be placed in advance in the filter and then watered by the liquid when it is desired to carry out a washing or exhausting operation using an appropriate solvent of soluble active substances contained in the solid particles .
- This is particularly the case for the preparation of coffee which consists of passing hot water through ground coffee.
- the passage of the liquid takes place by simple gravity.
- the filtration operation is. necessarily intermittent, that is to say that filtration phases are followed by cleaning phases for the evacuation of solid substances accumulated against the porous wall.
- continuous filters are known in which an endless porous wall is used, either in the form of an endless band, or in the form of a rotary cylinder, and in this case there is a filtration zone or sector followed by another zone. or cleaning sector, this cleaning generally being obtained by scraping using a fixed squeegee then unclogging the porous wall by rinsing in reverse.
- the passage of the liquid is necessarily by gravity or by suction, but it is excluded to operate by centrifugal means, the displacement or rotation of the porous wall being necessarily slow since it is he who presides the sequence of filtering and washing operations.
- the object of the invention is to overcome the above drawbacks by producing a filter which is both centrifugal and continuous, while being of a relatively simple embodiment, and which furthermore does not require any unclogging rinsing.
- the invention consists in constituting the porous filtering wall by a helical cylindrical winding with contiguous turns of a flexible strap of small section, this wall being mounted between several guide and drive rollers of elongated shape arranged according to generatrices of the cylinder.
- the rollers rotate on themselves at a low speed relative to the cage to give the entire cylindrical wall a relative rotational movement differential
- the strap being looped into an endless assembly so that in this relative movement it takes place constantly at one open end of the cylinder and is constantly wound at the other end, preferably around a closed bottom, the movement slow differential rotation is therefore accompanied by a continuous axial movement towards the open end, the product or products to be filtered being conveyed s by one or more suitable conduits in the vicinity of said bottom, while the centrifuged filtrate is collected by a casing outside the cage and the spun solid residues are continuously ejected at the open end of the cylinder.
- the porous filtration wall is constituted by a long flexible strap 1 of small section arranged in a helical winding with contiguous turns to form a cylindrical sleeve 2, the two ends of the strap being connected together by a turn back 3 to form an endless set.
- This flexible strap 1 can be made of metal or plastic, preferably of square or rectangular section, and it can advantageously include in its upper or lower face notches 4, preferably inclined so as to widen outwards in starting from a very shallow depth on the side intended to constitute the interior, this depth corresponding to the desired filtration fineness, for example 0.1 mm.
- the cylindrical sleeve 2 thus formed is mounted in a cage constituted by a number of cylindrical rollers 5, four in number in the figures, each arranged along a generatrix of the cylinder.
- Each of these rollers journals by its base in a lower flange 6 and by a part close to its upper end in an upper flange 7 by means of a notch 8 opening towards the center in a bore 9 of a diameter just sufficient to allow the passage of the sleeve 2, the upper flange 7 is rigidly fixed to the lower flange 6 by spacers 10, and the lower flange 6 is itself rigidly fixed by its hub 11 to an axis 12 journalled in fixed bearings 13 while being driven by a drive motor not shown.
- the entire cage assembly including the two flanges and the four vertical rollers, therefore rotates as a block around the axis 12 at a suitable speed to obtain centrifugal filtration, for example 1500 revolutions / min.
- the four rollers 5 are driven at a low speed of rotation on themselves, all in the same direction, by means of an appropriate mechanism located below the flange 6.
- This mechanism comprises a gear 14 integral with each of the lower ends of the rollers 5, below the flange 6, the four gears 14 meshing simultaneously on a single central gear 15 idling around the axis 12, this central gear being it -Even driven in rotation by a pinion 16 secured to a gear 17 which rotates around an axis 18 carried by the flange 6 and meshes with a central pinion 19 idly mounted on the axis 12 and whose base 20 can be immobilized in rotation by means of a suitable device not shown.
- the directions of rotation are those represented by the arrows in FIG. 4, remembering that this is a bottom view, and the ratios of the gears are such that the rollers turn slowly on themselves at a very low speed while the whole of the cage rotates at high speed .
- the sleeve 2 formed by all of the contiguous turns is applied by centrifugal force against the guide and drive rollers 5 and consequently begins to turn slowly on itself in the direction of the arrow 21 (see fig. 2) in a relative movement of rotation at low speed of the order of 12 revolutions / min in the example chosen.
- the sleeve 2 actually turns in the same direction as the cage, that is to say in the direction of the needles of a watch in fig. 2, and at a slightly lower speed, for example 1500 rpm for the cage and 1448 rpm for the sleeve.
- the direction of winding of the contiguous turns of the sleeve 2 is chosen in such a way that, in the movement above mentioned relative of the sleeve relative to the cage, the strap takes place at the upper part, just after the passage under one of the axial retaining cheeks 23 of one of the rollers 5, then carries out the return coil 3 passing to the outside the following rollers 5, but preferably inside the spacers 10 to wind continuously at the lower end on the cylindrical outer surface of a bottom wall 24 visible in FIG. 1 and turning madly around the hub 11 in order to be able to take with respect thereto the slow rotational movement of the entire filter.
- This movement is communicated to the bottom 24 by meshing or by friction on its periphery with a drive zone 25 situated at the base of the rollers 5 below the axial retaining cheeks 26.
- the filter according to the invention can be operated by successive loads by simply providing for this a braking device controlled from the base 20 of the central pinion 19 relative to the frame 22.
- the filtering device also has the advantage that it is possible to extend the axis 12 by an upper part 33, separable or not from the previous one and placed in the axis of the cylindrical sleeve 2, to drive at the upper part a screw grinder of the type known for grinding coffee.
- the grinding screw 34 is cut directly in the upper end of the axis 33 and rotates in an outer part 35 with a conical interior located at the base of a hopper not shown feeding the coffee beans using 'An adjustable flow distributor 36 which can also be driven by the same axis.
- the fineness of the grinding is adjusted, for example, by moving the base 35 in a helical movement with a vertical axis using a control rod 37 sliding in an inclined lumen 38 integral with the frame 22, the screw 33 being axially fixed.
- the filter according to the invention When the filter according to the invention is used for washing or depleting a pulverulent solid substance with a liquid substance, it is advantageous to first have the solid substance near the bottom 24 in a uniform cylindrical layer, then distribute the liquid above the place where the distribution of the solid takes place.
- a coaxial rotary distributor 39 comprising a central passage for the solid product and an at least partially conical external surface 40 on which the liquid is poured which is thus projected by centrifugal force , the distributor 39 being for this purpose driven in rotation, for example at the speed of the axis 12 or 33 by being secured to it by means of a through spindle 41.
- this distributor could be secured to the bottom 24 by pins parallel to the axis, the speed of the bottom being, as we saw above, very little different from that of the axis.
- the conical outer surface 40 of the distributor 39 can be extended by a cylindrical part which preferably has asperities to distribute the spraying of the liquid over a certain height.
- these asperities can be constituted by a rib 42 in the form of a helical spiral developing on the cylindrical outer surface 43 of the dispenser.
- a circular rib 44 forming a deflector can be placed at the base of the dispenser to evacuate the droplets of liquid which could possibly fall outside the exterior surface of the dispenser.
- the ground coffee can be fed into the axial passage of the rotary distributor 39 by any suitable means.
- this distributor coaxially and outside this axis by extending it axially by a tubular part 45 of which the upper end journals at the base of the grinding cone 35. If the latter moves axially to allow adjustment as indicated above, an oblong hole 46 is provided in the base of the axis 33 for the passage of the pin 41 and allow this movement to occur.
- the ground coffee which escapes directly between the screw 33 and the tubular part 45 may be pressed against the latter by centrifugal force and accumulate there.
- This is avoided according to the invention by having a fixed spiral 47 of helical steel wire freely mounted in the interval between the axis 33 and the bore of the tube 45 and of the rotary distributor 39, being only immobilized axially and in rotation by fixing its upper end 48 in the base of the cone 35.
- the ground coffee is routed regularly and without the possibility of blocking to the lower end of the distributor 39 where it is thus distributed by centrifugal force in the interval between the bottom 24 and the rib 44 to accumulate on an area of the same height on the inner surface of the sleeve 2,
- the liquid substance which is obviously hot water in this case, can be fed and heated continuously and distributed on the conical part 40 of the distributor 39. It is however preferable according to the invention to produce a water supply intermittently by supplying by a continuous flow a device well known in physics under the name intermittent fountain and consisting of a self-priming siphon placed in a container (not shown) which gradually fills and empties under the effect of the siphon.
- the capacity of this container between the high level and the low level is preferably chosen equal to a cup of coffee.
- the cold or preferably preheated water is therefore distributed by a continuous distributor, such as a pump, to the intermittent fountain, which distributes it by a pipe 49 at a small capacity 50 in the form of an annular sleeve arranged coaxially with outside the tube 45 and stationary in rotation, this capacity 50 comprising an internal heating resistor 51 supplied by wires 52, while flow spouts 53 are formed all around its bottom and vertically above the surface conical 40 of the dispenser 39.
- a continuous distributor such as a pump
- this capacity 50 comprising an internal heating resistor 51 supplied by wires 52, while flow spouts 53 are formed all around its bottom and vertically above the surface conical 40 of the dispenser 39.
- the periods of intermittent fountain shutdown have two advantages, the first being that there is a cessation of the flow of coffee through the chute 28 thus allowing to remove a full cup and replace it with an empty cup without losing of coffee, and the second being that, on the next arrival of the distribution of water on the hot resistance 51, there occurs a partial vaporization of this water which thus causes the ground coffee beans which have been dispensed to swell. the interval near the bottom 24.
- the grounds evacuation chute 31 is directed towards a grounds tank forming part of the apparatus and which is emptied periodically.
- the device also includes a water tank if you want to avoid a connection on the pipeline.
- the apparatus according to the invention makes it possible to quickly and automatically carry out all the operations of grinding, distribution, vaporization, pouring, passage and spinning as well as cleaning of the filter and evacuation of the grounds, the apparatus being able thus to function in an absolutely uninterrupted manner and to produce as many cups of coffee as desired if simply to supply it and empty its grounds container without it being necessary to stop it.
- this axis could also be arranged according to any other angle of orientation, for example horizontally, the rotary distributor 39 then being in this case replaced by simple fixed conduits, and the bottom 24 also being optional.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Centrifugal Separators (AREA)
- Apparatus For Making Beverages (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7716927 | 1977-06-02 | ||
| FR7716927A FR2372658A1 (fr) | 1977-06-02 | 1977-06-02 | Dispositif de filtration centrifuge continue pour separation, lavage ou epuisement, et application a une machine a cafe automatique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0000004A1 true EP0000004A1 (de) | 1978-12-20 |
| EP0000004B1 EP0000004B1 (de) | 1980-09-03 |
Family
ID=9191604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP78100037A Expired EP0000004B1 (de) | 1977-06-02 | 1978-06-01 | Kontinuierlich arbeitende Filterzentrifuge zum Abscheiden, Waschen oder Entleeren, und Anwendung in einer automatischen Kaffeemaschine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4204964A (de) |
| EP (1) | EP0000004B1 (de) |
| DE (1) | DE2860125D1 (de) |
| FR (1) | FR2372658A1 (de) |
| IT (1) | IT1206574B (de) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2936659A1 (de) * | 1979-09-11 | 1981-03-19 | Braunschweigische Maschinenbauanstalt AG, 3300 Braunschweig | Kontinuierlich arbeitende zuckerzentrifuge |
| US5265517A (en) * | 1991-10-09 | 1993-11-30 | Industria Columbiana De Electronicos Y Electrodomesticos, Incelt S.A. Of Carrera | Method and apparatus for brewing coffee |
| EP2741643B1 (de) * | 2011-08-09 | 2015-09-16 | Nestec S.A. | Schleudergetränkemaschine mit abflusssammlungsanordnung |
| CA2893521A1 (en) * | 2012-12-06 | 2014-07-03 | Nestec S.A. | Device for preparing a beverage by centrifugation |
| WO2015064649A1 (ja) * | 2013-10-31 | 2015-05-07 | ネピュレ株式会社 | 裏漉し装置 |
| ES2727953T3 (es) * | 2014-10-08 | 2019-10-21 | Nestle Sa | Unidad de extracción de una máquina de preparación de bebidas |
| US11484818B2 (en) * | 2019-02-11 | 2022-11-01 | North Carolina State University | Self-cleaning screen |
| US20210346824A1 (en) * | 2020-04-13 | 2021-11-11 | Evoqua Water Techhnologies LLC | Regenerative Media Filtration Apparatus Improvements |
| WO2024044130A1 (en) * | 2022-08-22 | 2024-02-29 | Watershed Systems, LLC | Debris clearing system and method |
| NL2034898B1 (en) * | 2023-05-23 | 2024-12-04 | Spinn Holding B V | Improved centrifugal coffee brewer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1767905A (en) * | 1926-02-27 | 1930-06-24 | William C Walker | Continuous centrifugal separator |
| US1846168A (en) * | 1929-08-10 | 1932-02-23 | Mine And Smelter Supply Compan | Filter |
| US1950869A (en) * | 1931-06-08 | 1934-03-13 | Hercules Powder Co Ltd | Centrifugal |
| DE691923C (de) * | 1938-12-16 | 1940-06-08 | Hans Decker | Schleudermaschine mit endlosem Band |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2321207A (en) * | 1941-08-25 | 1943-06-08 | B H & M Company | Screen for centrifugal machines |
| GB1108407A (en) * | 1965-09-30 | 1968-04-03 | Ceskoslovenska Akademie Ved | Continuous filtration centrifuge |
-
1977
- 1977-06-02 FR FR7716927A patent/FR2372658A1/fr active Granted
-
1978
- 1978-05-30 IT IT7868230A patent/IT1206574B/it active
- 1978-06-01 US US05/911,696 patent/US4204964A/en not_active Expired - Lifetime
- 1978-06-01 DE DE7878100037T patent/DE2860125D1/de not_active Expired
- 1978-06-01 EP EP78100037A patent/EP0000004B1/de not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1767905A (en) * | 1926-02-27 | 1930-06-24 | William C Walker | Continuous centrifugal separator |
| US1846168A (en) * | 1929-08-10 | 1932-02-23 | Mine And Smelter Supply Compan | Filter |
| US1950869A (en) * | 1931-06-08 | 1934-03-13 | Hercules Powder Co Ltd | Centrifugal |
| DE691923C (de) * | 1938-12-16 | 1940-06-08 | Hans Decker | Schleudermaschine mit endlosem Band |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1206574B (it) | 1989-04-27 |
| FR2372658B1 (de) | 1981-07-17 |
| IT7868230A0 (it) | 1978-05-30 |
| EP0000004B1 (de) | 1980-09-03 |
| FR2372658A1 (fr) | 1978-06-30 |
| US4204964A (en) | 1980-05-27 |
| DE2860125D1 (en) | 1980-12-11 |
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