DOSING DEVICE ADAPTED FOR DISPENSING A CONCENTRATE FROM A HOLDER IN A METERED MANNER

Abstract: The invention relates to a dosing device comprising a housing comprising at least one inlet, at least one outlet, and a liquid flow path extending from the inlet to the outlet. The dosing device is adapted for dispensing in a metered manner a viscous concentrate from a holder. The concentrate in diluted condition forms a beverage suitable for consumption. The dosing device is adapted to be connected, in use, to a storage space of the holder. According to the invention, the dosing device comprises a gear pump to be included in the liquid flow path, which gear pump can be driven in particular by a rotor located upstream of the gear pump, by means of changing magnetic fields.

Description: Title: Dosing device adapted for dispensing a concentrate from a holder in a metered manner. This invention relates to a dosing device comprising a housing comprising at least one inlet, at least one outlet, a liquid flow path extending from the inlet to the outlet, and a pump included in the liquid flow path, the dosing device being adapted for dispensing in a metered manner a viscous concentrate from a holder in which the concentrate is contained, the concentrate in diluted form giving a product suitable for consumption, the holder comprising a storage space in which the concentrate is contained, and the inlet of the dosing device being adapted to be connected, in use, to the storage space of the holder. Such a device is known from British patent application 2103296. The dosing device described therein comprises a hollow cylinder-shaped body manufactured from a flexible elastic material. The body in question encloses a pumping volume. Further, the device comprises an operating element for compressing the body in an axial direction. The device also comprises a hollow cylinder-shaped housing which is adapted to encompass said body on its outer side at least during the phase in which the pumping volume is reduced. The flexible body is cyclically deformed in an axial direction, with the result that in each cycle a predetermined amount of extract is dispensed. To that end, the operating element is driven by means of a pulsating magnetic field. For driving the operating element, the dosing device is placed in a unit for generating a pulsating magnetic field. In a pulsating magnetic drive, the position of the dosing device with respect to the unit in axial direction of the dosing device is of great influence on the power to be supplied. This makes placing the dosing device in the unit very critical. Further, the known dosing device has as a disadvantage that its action is dependent on the viscosity of the concentrate. The object of the invention is to provide an improved dosing device. To that end, the dosing device according to the invention is characterized in that the pump comprises a gear pump. As the dosing device comprises a gear pump included in the liquid flow path, it is no longer necessary, as in the known device, to utilize a pulsating drive. Because a pulsating drive can be omitted, the placement of the dosing device in a dispensing machine is no longer critical. A further advantage is that in the diluted form of the concentrate, the so-called zebra effect does not arise because the concentrate is not dispensed in a pulsating manner. Further, by virtue of the gear pump, the dosing device can be of economically advantageous construction. A further advantage of the device according to the invention is that metering can be set steplessly. Furthermore, the gear pump can be arranged such that the rotation axis of each gear pump is directed approximately parallel to the direction of the liquid flow path. Such a construction is easy to realize. Moreover, the dosing device can be designed with small overall dimensions. According to a more advanced embodiment, the dosing device is provided, upstream of the gear pump, with a rotor mechanically connected to the gear pump, for driving the gear pump using a changing magnetic field. Preferably the rotor is connected to the drive shaft for driving the gear pump. An advantage is that the rotor can be included in the liquid flow path, so that this also obtains the function of stirrer. In particular, the dosing device is driven by a drive shaft of which an axial axis is directed in the direction from the inlet to the outlet. As a dynamic liquid sealing of the drive shaft can be omitted, there is relatively little energy loss and there is a very small chance of leakage or contamination. A further advantage is that the concentrate remaining behind in the dosing device after use is hermetically sealed from the outside world. What is also achieved by virtue of the specific direction of the drive shaft is that the dosing device can be placed in a dispensing machine rotation-independently. The position of the rotor is not critical then. If the dosing device is connected to a holder filled with the concentrate, this connection can likewise be effected rotation-independently. According to the preferred embodiment, the dosing device comprises a substantially rotation-symmetrical housing of which an axial axis extends in the direction from the inlet to the outlet. In particular, the dosing device is provided, downstream of the gear pump, with a valve included in the liquid flow path which opens when the liquid pressure upstream of the valve exceeds a predetermined threshold value. The use of a gear pump in combination with a pressure relief valve has the advantage that no leakage flow owing to internal play arises in the non-driven condition. Moreover, the valve provides for a microbiological sealing, which is important for beverages suitable for consumption. The holder according to the invention is characterized in that it is filled with the concentrate which in diluted condition is suitable for consumption, the holder being fitted with a dosing device according to the invention as described hereinbefore. As the dosing device according to the invention, viewed in axial direction, can be made of low design, less length, viewed in this direction, is needed for driving than in the known linear magnet. This creates the possibility of making the dosing device extendible instead of foldable, so that a tearing strip in the holder, when it is designed as a so-called bag in box, can be omitted. This provides the advantage that making the bag in box operational involves a simpler operation. In particular, accordingly, the holder is provided with a bag formed from flexible sheetlike material, in which the concentrate is contained, and a housing in which the bag is accommodated. The invention also relates to an apparatus for preparing a beverage suitable for consumption, the apparatus being adapted to be charged with a holder as mentioned hereinbefore. The apparatus comprises a magnetization unit for generating at least one magnetic field which changes so as to drive the rotor to allow the dosing device to dispense concentrate from the holder in a metered manner. The apparatus further comprises means for diluting the dispensed concentrate with water for obtaining the beverage suitable for consumption. The magnetization unit can be provided with a magnet and driving means for rotating a magnet for generating the changing magnetic field. It is also possible, however, that the magnetization unit is provided with a plurality of coils for generating the changing magnetic field. The invention also relates to an assembly comprising an apparatus for preparing a beverage suitable for consumption and a holder as described hereinbefore. The apparatus is adapted to be loaded with the holder, the apparatus comprising driving means for driving the dosing device to cause the dosing device to dispense concentrate from the holder in a metered manner, and means for diluting the dispensed concentrate with water for obtaining the beverage suitable for consumption. The invention will presently be further explained with reference to the drawings, in which: Fig. 1 shows an exploded view of a possible embodiment of a dosing device according to the invention, which is connected to a Ijolder according to the invention. Fig. 1 also shows a magnetization unit of an apparatus for preparing a beverage suitable for consumption; Fig. 2 shows a number of parts of the dosing device according to Fig. 1; Fig. 3 shows a number of parts of the dosing device and the apparatus for preparing a beverage suitable for consumption according to Fig. 1; Fig. 4a shows a top plan view of the gear pump of the dosing device according to Fig. 1; Fig. 4b shows a cross section of the dosing device according to Fig. 1 which is placed in the magnetization unit of Fig. 1; Fig. 5a shows a top plan view of the dosing device according to Fig. 1 which is placed in the magnetization unit according to Fig. 1; Fig. 5b shows a view of the dosing device according to Fig. 1 which is placed in the magnetization unit according to Fig. 1; and Fig. 6 shows a holder with a dosing device according to the invention, an apparatus for preparing a beverage suitable for consumption according to the invention, and an assembly comprising the apparatus and the holder according to the invention. In Figs. 1-6, reference numeral 1 indicates a dosing device according to the invention. The dosing device comprises an inlet 2 and at least one outlet 4. The liquid flow path extends from the inlet 2 to the outlet 4. In this example, the dosing device comprises a housing 6a and 6b composed of two parts, which is rotation-symmetrical around an axis which is directed in the direction of the liquid flow path. In the housing 6a, 6b, a gear pump 8 is included. At the top, the gear pump 8 comprises a covering plate 10 having an inflow opening 12. The inflow opening 12 is in fluid communication with a space where the teeth of, in this case two, gearwheels 14a and 14b mesh. The gearwheel 14b is driven by a drive shaft 16 which in mounted condition extends through an opening 18 of the covering plate 10. The drive shaft 16 can be driven directly by means of an external drive, for rotation of the gear pump. The gear pump 8 is provided at its underside with an outflow opening 20 for dispensing liquid. The drive shaft 16 is so directed that an axial axis of this drive shaft is directed in the direction from the inlet 2 to the outlet 4. In this example, the housing 6a, 6b is designed to be substantially rotation-symmetrical around the axial axis, likewise extending in the direction from the inlet 2 to the outlet 4. In this example, however, the dosing device is provided, upstream of the gear pump 8, with a rotor 22 connected mechanically with the gear pump, in this example connected mechanically with the rotary shaft 16. In mounted condition, this rotor 22 is disposed above the covering plate 10. The rotor can be driven by means of an external drive for rotating the gear pump 8. Preferably, the rotor is adapted to be driven by means of a changing magnetic field, for the purpose of driving the gear pump 8. In this example it holds, further, that the rotor 22 is included in the liquid flow path mentioned. In this example, the rotor is provided with a permanent magnet for contactlessly driving the rotor by means of at least one varying magnetic field. In particular it holds, in this example, that the rotor comprises a plurality of arms 24 extending in radial direction of the rotation axis (drive shaft 16). More particularly, there are only two arms, disposed in line with each other and hence forming a beamlike body. The ends of the arms form poles of the permanent magnet mentioned. The poles of the permanent magnet will want to follow the changing magnetic field, which has as a result that the rotor and the drive shaft 16 will start to rotate. The device described up to this point works as follows. Suppose that the inlet 2 of the dosing device is connected to a holder 26, shown schematically in Figs. 1 and 6, in which an amount of concentrate, such as, for instance, coffee concentrate, is present. The holder 26, as shown best in Fig. 6, is fitted with the dosing device according to Fig. 1. In this example, the holder 26 includes a bag 28 (indicated by broken lines), formed by a flexible sheetlike material, in which the concentrate is contained, and a housing 30 in which the bag 28 is accommodated. The housing 30 is preferably made of substantially rigid design and hence is more rigid than the bag 28. The inlet 2 of the dosing device is in fluid communication with the inside of the bag 28. By presently generating a magnetic field changing in a predetermined manner, the rotor 22 will start to rotate in a predetermined manner. As a consequence, the gear pump 8 will likewise start to rotate, with the result that concentrate flows via the inflow opening 12 and the space between the teeth of the gearwheels to the outflow opening 20 mentioned. Thus the amount of concentrate dispensed in a metered manner corresponds with the angle of rotation through which the rotor 22 is rotated. The relation is substantially linear. In Fig. 6, reference numeral 31 designates an apparatus for preparing a beverage suitable for consumption. The apparatus 31 is adapted to be loaded with the holder 26. The apparatus 31 comprises a magnetization unit 32 for generating the changing magnetic field referred to for driving the rotor. Further, the apparatus comprises means 34 for diluting the concentrate dispensed by the dosing device 1 with water. These means 34 comprise a hot water generator 36 and a mixing unit 38. In use, the housing 6a, 6b of the dosing device is inserted through an opening 40 of the magnetization device, such that the outlet 4 of the dosing device reaches into an opening 42 of the mixing device 38. A control unit 44 of the apparatus 31 controls the magnetization unit 32 via line 45, such that a changing magnetic field is generated which causes the rotor 22 to rotate through a predetermined angle of rotation. As a result, from the holder 26 a predetermined amount of concentrate is dispensed to the mixing device 38. The control unit 44 also activates the hot water unit 36 and the mixing unit 38 via respective electrical lines 46 and 48. As a result, hot water is sent from the hot water unit 36 to the mixing unit 38. In the mixing unit, the hot water is mixed with the dispensed concentrate, after which the concentrate, in diluted condition and hence in the condition of a beverage suitable for consumption, leaves an outlet opening 50 of the apparatus 31. In this example, the magnetization unit 32 comprises a plurality of coils 52 for generating the changing magnetic field. The invention is not limited in any way to the embodiments outlined hereinabove. Thus, the rotor 22 may also be provided exclusively with soft iron. Magnetization of the rotor is then effected by the magnetic field of the magnetization unit 31. The rotor will want to orient in this changing magnetic field, so that the rotation is effected. The rotor 22 may also be driven, in a manner known per se, as is known for an eddy current motor. Upon rotation of the rotor, fly-back pulses arise in the coils 52 of the magnetization device which are not energized. These fly-back pulses can be utilized in the magnetization device in a manner known per se to determine the rotational position of the rotor. On the basis of this rotational position, a (feedback) control configuration known per se can be utilized. It is also possible that the coils 52 are replaced by permanent magnets, these magnets being mechanically rotated for generating the changing magnetic field. Further, in the outflow opening 20 referred to, a valve 54 may be included which opens when the liquid pressure upstream of the valve exceeds a predetermined threshold value. This involves a so-called non- return valve comprising a shut-off member 56 with a spring 58 which is schematically shown in this example. In this example, the housing 6a and 6b is made of a suitable plastic. The gearwheels 14a and 14b and the drive shaft 16 are also made of plastic. The only metal part is therefore the rotor 22. It is also possible that the rotor is included in the liquid flow path downstream of the gear pump. The gear pump, instead of being driven by means of the rotor, can also be driven in a different manner. Thus, the gear pump can also be driven mechanically, by means of, for instance, a motor. This motor can then be a part of the apparatus 31. The valve 54 can also be designed as a so-called step valve. Such variants are all understood to fall within the scope of the invention.

Claims: CLAIMS 1. A dosing device comprising a housing comprising at least one inlet, at least one outlet, a liquid flow path extending from the inlet to the outlet, and a pump included in the liquid flow path, the dosing device being adapted for dispensing in a metered manner a viscous concentrate from a holder in which the concentrate is contained, the concentrate in diluted form giving a product suitable for consumption, the holder comprising a storage space in which the concentrate is contained, and the inlet of the dosing device being adapted to be connected, in use, to the storage space of the holder, characterized in that the pump comprises a gear pump. 2. A dosing device according to claim 1, characterized in that the gear pump is driven by a drive shaft of which an axial axis extends in a direction from the inlet to the outlet . 3. A dosing device according to claim 1 or 2, characterized in that the housing of the dosing device is of substantially rotation-symmetrical design, with an axial axis of the housing extending in the direction from the inlet to the outlet. 4. A dosing device according to any one of the preceding claims, characterized in that the dosing device is provided, downstream of the gear pump, with a valve included in the liquid flow path, which opens when the liquid pressure upstream of the valve exceeds a predetermined threshold value. 5. A dosing device according to any one of the preceding claims, characterized in that the dosing device comprises a rotor rotatably connected to the housing for rotation around a rotation axis, for causing the rotor to rotate about the rotation axis by means of at least one changing magnetic field, the rotor being mechanically connected to the gear pump for driving the gear pump with the rotating rotor. 6. A dosing device according to claims 2 and 5, characterized in that the rotor is connected to the drive shaft for driving the gear pump. 7. A dosing device according to claim 5 or 6, characterized in that the rotor is included in the liquid flow path. 8. A dosing device according to claim 7, characterized in that the rotor is included in the liquid flow path upstream of the gear pump. 9. A dosing device according to any one of claims 5-8, characterized in that the rotor is provided with a magnetizable material such as soft iron. 10. A dosing device according to any one of claims 5-9, characterized in that the rotor comprises a permanent magnet for contactlessly driving the rotor by means of at least one changing magnetic field. 11. A dosing device according to any one of claims 5-10, characterized in that the rotor comprises a plurality of arms extending in radial direction of the rotation axis. 12. A dosing device according to claims 10 and 11, characterized in that the ends of the arms form poles of the permanent magnet. 13. A holder filled with concentrate which in diluted form is suitable for consumption, the holder comprising a dosing device according to any one of the preceding claims. 14. A holder according to claim 13, characterized in that the holder comprises a bag formed from a flexible sheetlike material in which the concentrate is contained, and a housing in which the bag is received. 15. A holder according to claim 14, characterized in that the inlet of the dosing device is connected to the bag. 16. A holder according to any one of claims 13-15, characterized in that the housing is of more rigid design than the bag. 17. An apparatus for preparing a beverage suitable for consumption, the apparatus being adapted to be loaded with a holder according to any one of the preceding claims 13-16 which is fitted with a dosing device according to any one of claims 5-12, the apparatus comprising a magnetization unit for generating at least one magnetic field changing such that the rotor is contactlessly driven by the magnetization unit for the dosing device to dispense concentrate from the holder in a metered manner, and means for diluting the dispensed concentrate with water for obtaining the beverage suitable for consumption. 18. An apparatus according to claim 17, characterized in that the magnetization unit comprises a magnet and driving means for rotating the magnet for generating the changing magnetic field. 19. An apparatus according to claim 17, characterized in that the magnetization unit comprises a plurality of coils. 20. An assembly comprising an apparatus for preparing a beverage suitable for consumption and a holder according to any one of the preceding claims 13-16, the apparatus being loaded with the holder, and the apparatus comprising driving means for driving the dosing device for the dosing device to dispense concentrate from the holder in a metered manner, and means for diluting the dispensed concentrate with water for obtaining the beverage suitable for consumption. 21. An assembly according to claim 20, characterized in that the holder is detachably connected to the apparatus. 22. An assembly according to claim 20 or 21, wherein the holder comprises a dosing device according to any one of claims 5-12, characterized in that the apparatus further comprises a magnetization unit for generating at least one magnetic field changing such that the rotor is driven for causing the dosing device to dispense concentrate from the holder. , 23. An assembly according to claim 22, characterized in that the magnetization unit comprises a magnet and driving means for rotating the magnet for generating the changing magnetic field. 24. An assembly according to claim 22, characterized in that the magnetization unit comprises a plurality of coils.

Inventors: BRAMER ALBERTUS MARIA, D HOND PAUL ISODORE, BRAMER, ALBERTUS, MARIA, D'HOND, PAUL, ISODORE
Applicants: BRAMER ALBERTUS MARIA, HOND PAUL ISODORE D, SARA LEE DE NV, BRAMER, ALBERTUS, MARIA, D'HOND, PAUL, ISODORE, SARA LEE/DE N.V.
Application year: 2000
Main classification: G01F11
IPC codes: A47J31, B65B37, B67D1, F04C2, F04C15, G01F11