Machine for producing and dispensing liquid and semi-liquid consumer food products

1. A machine for producing liquid and semi-liquid consumer food products, comprising:

at least one container for containing a basic product of at least one chosen from a liquid and a semi-liquid consumer food product;

a refrigeration system including a compressor, the refrigeration system acting on the container for lowering a temperature of the basic product; the refrigeration system comprising carbon dioxide as a refrigerant; the refrigeration system performing a transcritical refrigeration cycle on the refrigerant;

a heating circuit connected to the at least one container for increasing the temperature of the basic product;

wherein the refrigeration system comprises an evaporator in contact with the container, in fluid communication with the compressor, in which the compressed refrigerant is heated, absorbing heat from the container;

wherein the heating circuit comprises a branch in fluid connection with a compressor delivery side;

wherein the heating circuit is in fluid communication with the evaporator;

and further comprising at least one valve positioned in each of the refrigeration system and the heating circuit to selectively isolate the heating circuit for the evaporator from the refrigerator system for the evaporator;

wherein the refrigeration system also comprises a control system for preventing a pressure of the refrigerant from exceeding a predetermined safety value, the control system including a pressure sensor for measuring a pressure of the refrigerant output from the compressor, the control system acting on the compressor to reduce a thermal power supplied to the refrigerant during compression to prevent the pressure of the refrigerant from exceeding the predetermined safety value.

2. The machine according to claim 1 , wherein the refrigeration system comprises at least a compressor for compressing a flow of refrigerant from a first pressure which is lower than a refrigerant critical pressure to a second pressure which is higher than the refrigerant critical pressure.

3. The machine according to claim 2 , wherein the compressor is a single-stage type.

4. The machine according to claim 3 , comprising a plurality of single-stage compressors mounted in tandem.

5. The machine according to claim 2 , wherein the compressor is an intercooler two-stage type.

6. The machine according to claim 5 , wherein the compressor comprises an electric motor and an inverter connected to the electric motor for continuously controlling a motor speed of rotation.

7. The machine according to claim 6 , wherein the compressor comprises an electric motor; the electric motor being an asynchronous type.

8. The machine according to claim 6 , wherein the compressor comprises an electric motor; the electric motor being a brushless type.

9. The machine according to claim 8 , wherein the refrigeration system comprises a gas-cooler located downstream of the compressor for increasing/lowering a temperature of the flow of compressed refrigerant.

10. The machine according to claim 9 , wherein the gas-cooler comprises at least a radiator and a fan for generating an air flow to remove heat from the flow of compressed refrigerant.

11. The machine according to claim 9 , wherein the gas-cooler comprises at least a hydraulic circuit for removing heat from the flow of compressed refrigerant.

12. The machine according to claim 11 , wherein the refrigeration system also comprises an intermediate heat exchanger located upstream of the compressor for cooling the flow of refrigerant entering the compressor.

13. The machine according to claim 12 , wherein the refrigeration system also comprises a throttling element located upstream of the evaporator and in fluid communication with the compressor for causing the compressed refrigerant to expand.

14. The machine according to claim 13 , wherein the throttling element also comprises an expansion valve.

15. The machine according to claim 14 , wherein the expansion valve is a thermostatic expansion valve.

16. The machine according to claim 15 , wherein the thermostatic expansion valve comprises an external equalizer.

17. The machine according to claim 13 , wherein the throttling element comprises a fixed capillary tube.

18. The machine according to claim 13 , wherein the throttling element comprises an adjustable automatic valve.

19. The machine according to claim 13 , wherein the throttling element comprises a pulse valve.

20. The machine according to claim 13 , wherein the throttling element comprises an electronic valve.

21. The machine according to claim 1 , comprising a plurality of containers for a basic product of the consumer product to be made, each of the containers being connected to a respective evaporator.

22. The machine according to claim 21 , wherein it is a machine for whipping and freezing.

23. The machine according to claim 21 , wherein it is a self-pasteurizing soft ice cream machine for producing and distributing ice creams.

24. The machine according to claim 21 , wherein it is a crushed-ice drink maker.

25. The machine according to claim 21 , wherein it is a pasteurizing machine.

26. The machine according to claim 21 , wherein it is a cream whipping machine.

27. The machine according to claim 21 , wherein it is a cream cooking machine.

28. A method for producing liquid and semi-liquid consumer food products, comprising:

providing at least one container for containing a basic product of at least one chosen from a liquid and a semi-liquid consumer food product;

providing a refrigeration circuit acting on the container for lowering a temperature of the basic product; the refrigeration circuit comprising carbon dioxide as a refrigerant;

the refrigeration circuit performing a transcritical refrigeration cycle on the refrigerant;

providing a heating circuit connected to the at least one container for increasing the temperature of the basic product; and

using compressed and heated refrigerant from the refrigeration circuit in the heating circuit for the increasing of the temperature of the basic product;

providing the refrigeration system with a control system for preventing a pressure of the refrigerant from exceeding a predetermined safety value, the control system including a pressure sensor for measuring a pressure of the refrigerant output from a compressor of the refrigeration circuit for compressing the refrigerant, the control system acting on the compressor to reduce a thermal power supplied to the refrigerant during compression to prevent the pressure of the refrigerant from exceeding the predetermined safety value.

29. The method according to claim 28 , wherein the temperature of the basic product is heated sufficiently to pasteurize the basic product.

30. The method according to claim 28 , and further comprising providing at least one valve in each of the refrigeration circuit and the heating circuit to selectively isolate the heating circuit from the refrigeration circuit.