Milk frothing system (1) including a water conduit (10) that successively interconnects a water reservoir (11); a pump (12); a heater (15), configured to evaporate water; and a mixing node (31). The system further includes an air conduit (20) that successively interconnects an air inlet (21); a firs
Milk frothing system (1) including a water conduit (10) that successively interconnects a water reservoir (11); a pump (12); a heater (15), configured to evaporate water; and a mixing node (31). The system further includes an air conduit (20) that successively interconnects an air inlet (21); a first check valve (22); a second check valve (24); and the mixing node. The system also includes a steam/air conduit (30) that successively interconnects the mixing node, and a frothing device (32). The milk frothing system additionally includes an expansion vessel (60), having a water chamber and an air chamber, said water chamber being connected to a point of the water conduit, downstream of the pump and upstream of the heater, and said air chamber being connected to a point of the air conduit, downstream of the first check valve and upstream of the second check valve provided therein.
대표청구항▼
1. A milk frothing system, comprising: a water conduit that, viewed in a downstream direction thereof, successively interconnects: a water reservoir;a pump;a heater, configured to evaporate the water in the water conduit; anda mixing node;an air conduit that, viewed in a downstream direction thereof
1. A milk frothing system, comprising: a water conduit that, viewed in a downstream direction thereof, successively interconnects: a water reservoir;a pump;a heater, configured to evaporate the water in the water conduit; anda mixing node;an air conduit that, viewed in a downstream direction thereof, successively interconnects: an air inlet;a first check valve;a second check valve andthe mixing node;a steam/air conduit (30) that, viewed in a downstream direction thereof, successively interconnects: the mixing node; anda frothing device;an expansion vessel comprising a water chamber and an air chamber, said water chamber being connected to a point of the water conduit, downstream of the pump and upstream of the heater, and said air chamber being connected to a point of the air conduit, downstream of the first check valve and upstream of the second check valve provided therein. 2. The milk frothing system according to claim 1, further comprising: a water backflow conduit, which interconnects: a point of the water conduit, downstream of the pump and upstream of the heater;a backflow control valve; anda point of the water conduit, downstream of the water reservoir and upstream of the pump. 3. The milk frothing system according to any claim 1, wherein the backflow control valve is a water-pressure operated, three-port valve that is disposed in the water conduit at a point downstream of the pump. 4. The milk frothing system according to claim 3, wherein the backflow control valve comprises: a first valve chamber, said first valve chamber having a first port that is connected to an upstream section of the water conduit;a second valve chamber, said second valve chamber having a second port and a third port, wherein the second port is connected to a downstream section of the water conduit, and wherein the third port is connected to the water backflow conduit;a flow restriction, interconnecting the first port and the second port, such that a flow of water through the water conduit gives rise to a pressure differential across the flow restriction and between the first and the second valve chamber; anda movable membrane, sealingly disposed between the first valve chamber and the second valve chamber, and capable of closing off the third port under the influence of a pressure differential caused by a pump-driven downstream flow of water through the water conduit. 5. The milk frothing system according to claim 3, wherein the backflow control valve comprises: a valve chamber, said valve chamber having: a first port that is connected to an upstream section of the water conduit;a second port that is connected to a downstream section of the water conduit; anda third port that is connected to the water backflow conduit, said third port being wider than said second port;a float, disposed in the valve chamber, and dimensioned such that it can close off the third port. 6. The milk frothing system according to claim 1, wherein the water conduit further includes a third check valve, disposed downstream of the pump and upstream of the heater, said check valve having a cracking pressure that can be reached or exceeded only when the pump is operative. 7. The milk frothing system according to claim 1, wherein the air conduit includes an air dosing restriction, disposed between the first check valve and the second check valve. 8. The milk frothing system according to claim 1, wherein the water conduit further includes a water dosing restriction, disposed downstream of the pump and upstream of the heater. 9. The milk frothing system according to claim 1, configured such that—during operation—steam and air are mixed at the mixing node at a volumetric water flow rate to volumetric air flow rate ratio between 1:5 and 1:15, said volumetric flow rate ratio being determined at ambient pressure and temperature. 10. The milk frothing system according to claim 1, wherein the pump is a vibration pump. 11. The milk frothing system according to claim 1, wherein the frothing device comprises a Venturi-pipe having a milk supply line connected thereto at a constricted portion thereof. 12. The milk frothing system according to claim 1, wherein the frothing device comprises a steam wand. 13. A coffee machine comprising a milk frothing system according to claim 1.
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Siccardi Alberto (Via B. Panizza 8 - 20144 - Milan ITX), Automatic device for obtaining frothy milk.
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