Mobile beverage dispensing machine and method for preparing a beverage

1. A mobile beverage dispensing machine, comprising:

a liquid tank having an insulated tank body for receiving and storing a liquid used for preparing a beverage;

a beverage preparation unit for preparing a beverage using the liquid and dispensing the prepared beverage;

a fluid circuit for delivering the liquid from the tank to the beverage preparation unit, wherein the fluid circuit comprises:

a first fluid path fluidly connecting the tank with the beverage preparation unit;

a second fluid path fluidly connecting the tank with ambient air at a certain overpressure above atmospheric pressure in the tank;

an air pump; and

at least one control unit configured for actuating the air pump to fill air inside the tank; and

wherein the first fluid path and the second fluid path are connected with a third fluid path;

heating means for heating the liquid in the tank;

at least one main power supply connector connectable to an external power source and at least one mobile power source;

at least one control unit configured to:

control and operate at least part of the heating means by external power to heat up the liquid in the tank when the machine is supplied in electrical power by the main power supply connector connected to an external power source; and

control and operate at least part of the heating means by power of the mobile power source to keep heating liquid in the tank when the machine is no longer supplied in electrical power from the at least one main power supply connector; and

a first control valve activated by the control unit to fluidly connect the air pump to a first portion of the first fluid path.

2. The mobile beverage dispensing machine according to claim 1 , wherein the fluid circuit further comprises a fourth fluid path bypassing the first check valve of the second fluid path, wherein the fourth fluid path comprises a second check valve opening at a second calibrated pressure below the calibrated pressure of the first check valve, and wherein the fluid circuit further comprises a second control valve controlled by the control unit for selectively closing the third fluid path or fourth fluid path.

3. The mobile beverage dispensing machine according to claim 2 , wherein the second calibrated pressure is below 1 bar.

4. The mobile beverage dispensing machine according to claim 2 , wherein a liquid pump is provided in the fluid circuit in the first fluid path for pumping liquid from the tank to the beverage preparation unit.

5. The mobile beverage dispensing machine according to claim 4 , wherein the liquid pump is provided between the first control valve and the beverage preparation unit, and wherein the liquid pump is controlled by the control unit.

6. The mobile beverage dispensing machine according to claim 4 , wherein the fluid circuit further comprises a third control valve wherein the third control valve is positioned downstream the liquid pump in the first fluid path for selectively opening or closing a drainage fluid path.

7. The mobile beverage dispensing machine according to claim 6 , wherein the third control valve is controlled by the control unit.

8. The mobile beverage dispensing machine according to claim 6 , wherein the second fluid path and/or the drainage fluid path are fluidly connected to a drip tray placed below the beverage preparation unit.

9. A method for preparing a beverage using the mobile beverage dispensing machine according to claim 1 , the method comprising the steps of:

controlling and operating at least part of the heating means by external power to heat up the liquid in the tank as the machine is supplied in electrical power by the main power supply connector connected to an external power source; and

controlling and operating at least part of the heating means by power of the mobile power source to keep heating liquid in the tank as the machine is stopped being supplied in electrical power from the at least one main power supply connector.

10. A mobile beverage dispensing machine, comprising:

a liquid tank having an insulated tank body for receiving and storing a liquid used for preparing a beverage;

a beverage preparation unit for preparing a beverage using the liquid and dispensing the prepared beverage;

a fluid circuit for delivering the liquid from the tank to the beverage preparation unit, wherein the fluid circuit comprises:

a first fluid path fluidly connecting the tank with the beverage preparation unit;

a second fluid path fluidly connecting the tank with ambient air at a certain overpressure above atmospheric pressure in the tank, wherein the second fluid path comprises a check valve opening at a calibrated pressure value above atmospheric pressure;

an air pump; and

at least one control unit configured for actuating the air pump to fill air inside the tank;

heating means for heating the liquid in the tank;

at least one main power supply connector connectable to an external power source and at least one mobile power source;

at least one control unit configured to:

control and operate at least part of the heating means by external power to heat up the liquid in the tank when the machine is supplied in electrical power by the main power supply connector connected to an external power source; and

control and operate at least part of the heating means by power of the mobile power source to keep heating liquid in the tank when the machine is no longer supplied in electrical power from the at least one main power supply connector; and

a first control valve activated by the control unit to fluidly connect the air pump to a first portion of the first fluid path.

11. The mobile beverage dispensing machine according to claim 10 , wherein the heating means comprise a first heating element and a second heating element, wherein the first heating element is connectable or connected to the main power supply connector and the second heating element is connectable or connected to the at least one mobile power source.

12. The mobile beverage dispensing machine according to claim 10 , further comprising temperature control sensor means being provided in the tank, wherein the temperature control sensor means are connected to the control unit and the measured temperature data received from the temperature control sensor means is used as input for controlling the heating means.

13. The mobile beverage dispensing machine according to claim 10 , wherein the tank is releasably provided in the machine, wherein the tank comprises fluid connectors for fluidly connecting the tank with the fluid circuit and comprises electrical connectors for electrically connecting the heating means with the main power supply connector and with the mobile power source via the control unit.

14. A method for preparing a beverage using the mobile beverage dispensing machine according to claim 10 , the method comprising the steps of:

controlling and operating at least part of the heating means by external power to heat up the liquid in the tank as the machine is supplied in electrical power by the main power supply connector connected to an external power source; and

controlling and operating at least part of the heating means by power of the mobile power source to keep heating liquid in the tank as the machine is stopped being supplied in electrical power from the at least one main power supply connector.

15. A mobile beverage dispensing machine, comprising:

a liquid tank having an insulated tank body for receiving and storing a liquid used for preparing a beverage, wherein the tank comprises a lid for selectively covering the tank body;

a beverage preparation unit for preparing a beverage using the liquid and dispensing the prepared beverage;

a fluid circuit for delivering the liquid from the tank to the beverage preparation unit, wherein the fluid circuit comprises:

a first fluid path fluidly connecting the tank with the beverage preparation unit;

an air pump; and

at least one control unit configured for actuating the air pump to fill air inside the tank;

heating means for heating the liquid in the tank;

at least one main power supply connector connectable to an external power source and at least one mobile power source;

at least one control unit configured to:

control and operate at least part of the heating means by external power to heat up the liquid in the tank when the machine is supplied in electrical power by the main power supply connector connected to an external power source; and

control and operate at least part of the heating means by power of the mobile power source to keep heating liquid in the tank when the machine is no longer supplied in electrical power from the at least one main power supply connector; and

a first control valve activated by the control unit to fluidly connect the air pump to a first portion of the first fluid path; and

wherein the heating means and/or part of the fluid circuit are provided within the lid.

16. The mobile beverage dispensing machine according to claim 15 , wherein the heating means comprise a first heating element and a second heating element, wherein the first heating element is connectable or connected to the main power supply connector and the second heating element is connectable or connected to the at least one mobile power source.

17. The mobile beverage dispensing machine according to claim 15 , further comprising temperature control sensor means being provided in the tank, wherein the temperature control sensor means are connected to the control unit and the measured temperature data received from the temperature control sensor means is used as input for controlling the heating means.

18. The mobile beverage dispensing machine according to claim 15 , wherein the tank is releasably provided in the machine, wherein the tank comprises fluid connectors for fluidly connecting the tank with the fluid circuit and comprises electrical connectors for electrically connecting the heating means with the main power supply connector and with the mobile power source via the control unit.

19. A method for preparing a beverage using the mobile beverage dispensing machine according to claim 15 , the method comprising the steps of:

controlling and operating at least part of the heating means by external power to heat up the liquid in the tank as the machine is supplied in electrical power by the main power supply connector connected to an external power source; and

controlling and operating at least part of the heating means by power of the mobile power source to keep heating liquid in the tank as the machine is stopped being supplied in electrical power from the at least one main power supply connector.