Coffee machine for professional use

Abstract

A coffee machine for professional use, for the production of hot water to be sent to a hot water line (B) for the preparation of beverages or to coffee dispensing lines (C) by passing hot water through respective dosers, and for the generation of steam sent in a line (D), said machine comprising a water supply line (A), from which a first line (A1) branches off for the supply of the steam production line (D) and a second line (A2) branches off for the supply of the hot water line (B) and the lines (C) for the water supplying the coffee dispensing dosers, werein said first and second lines (A1), (A2) enter at least one device in magnetic material (6; 6', 6") and at least one coil (8; 8', 8") is provided for generating an electromagnetic field that couples with said at least one device (6; 6', 6") to superheat by induction the water in said first supply line (A1) to directly generate the steam to be sent in said line (D) and to heat by induction the water in said second supply line (A2) for the sending to the hot water line (B) and to the lines for the water supplying the dosers (C).

Description

[0001] COFFEE MACHINE FOR PROFESSIONAL USE

[0002] DESCRIPTION

[0003] The present invention relates to a coffee machine for professional use for the production of a beverage commonly named espresso, obtained by passing hot water through a measure of coffee.

[0004] This machine is likewise suitable for dispensing hot water for the preparation of hot tea beverages or infusions, and for creating high-temperature steam to be used, for example, to heat and froth milk for cappuccino or caffe macchiato.

[0005] Background to the invention

[0006] US 2019 / 142211 Al describes an apparatus for preparing beverages comprising a water induction heater, a pump for feeding the water to the heater, a logic unit for controlling said heater and said pump, a device for heating and / or frothing milk, wherein said logic unit is configured for controlling the pump and the heater so that it is produced steam for heating and / or frothing the milk fed into said device.

[0007] Figure 1 illustrates the system solution currently used to produce machines for professional use for the preparation of coffee and hot beverages and for the production of steam.

[0008] Starting from the supply of water A, which has been previously softened or purified, the system is made up of a pump (P) which, by means of a three-way valve (V), can supply a boiler (H) or, when required, the line of dispensers C, of which only one is shown in the drawing.

[0009] The water supplied to the dispensers traverses a heat exchanger (S) immersed in the boiler which supplies the heat necessary for heating the water for the dispensers. In the boiler, the water has a temperature of approximately 110-120°C, which would be too high for coffee extraction, while in the exchanger (S) the temperature reaches 90-95°C, optimal for sending to the dispensers.

[0010] The steam line (D) is derived directly from the boiler and the steam that is extracted is that in conditions of saturation located in the upper part of the boiler, in equilibrium with the water present therein. The water intended for the preparationof hot beverages is supplied by a line (B) that takes the water directly from the boiler. The boiler is kept at temperature by means of an electric resistance (R) immersed in the water of the boiler. The system also comprises a solenoid valve (El) or a manual valve on the steam supply line, valves (W) on the dispensers, a solenoid valve (E2) or a manual valve on the hot water dispensing line, a safety valve (VS) on the boiler and a thermocouple (T) for controlling the temperature of the boiler.

[0011] The solution according to the state of the art as described provides for the use of a boiler with the function of production of the steam and as a heat source for the heating of the water, by means of heat exchange in the boiler, to be used for the production of coffee-based beverages or other hot beverages.

[0012] The use of said boiler has the following disadvantages:

[0013] 1) The presence of a pressurised vessel is a potential hazard, given the environment in which it is to operate (public premises).

[0014] 2) The presence of a pressurised vessel in a public environment limits the possibility of increasing the temperature and consequently the pressure in the boiler in order to be able to obtain steam at a higher temperature.

[0015] 3) In the boiler, having to ensure constant pressure during withdrawal, there is a significant amount of pressurised steam which, in the event of disconnection or leakage from a connection, generates a large uncontrollable leak of steam.

[0016] 4) The boiler contains a large amount of water in equilibrium with the steam at working pressure, which would boil in the event of accidental depressurisation, increasing the leakage of steam.

[0017] 5) The steam supplied to users is not generated at the time of request but is steam produced and maintained in the boiler until its use.

[0018] 6) The hot water used for the production of beverages such as infusions or other beverages comes from the boiler and is kept therein, given the large volumes also for long periods, before its use.

[0019] 7) Since there is a single boiler for hot water and steam which are in thermodynamic equilibrium with each other, it is not possible to differentiatethe temperatures. In particular, since water has to be produced at a temperature slightly higher than 100°C, it is not possible to have high- temperature superheated steam at atmospheric pressure. This disadvantage determines the need to have to use high volumes of steam for a given heat input and consequently condensation is generated in the fluid to be heated which tends to dilute the heated product, particularly milk.

[0020] 8) The dimensions of the boiler for larger machines and its temperature cause a significant loss of energy that can only be compensated by inserting significant insulation.

[0021] 9) The volume of water present in the boiler requires a long time to pass from starting to availability which requires a prestart or maintaining at temperature even when not required, which worsens the efficiency of the machine.

[0022] 10) Finally, the dimensions of the boiler determine the dimensions of the machine, not allowing optimisation of the space occupied.

[0023] Summary of the invention

[0024] From what is disclosed above, the disadvantages of coffee machines of the prior art are clear.

[0025] The object of the invention is to provide a coffee machine capable of overcoming the disadvantages listed above.

[0026] This object is achieved by a coffee machine having the features listed in independent claim 1.

[0027] Advantageous embodiments of the invention are disclosed by the dependent claims. To overcome the disadvantages listed above in points 1), 2), 3), 4), 5), 6) the invention provides for the direct generation of the steam by superheating a controlled flow of water and for the direct heating of the water to be used to supply the line for the water supplying the coffee dispensing dosers and for the hot water to be used for hot beverages; in this way, the need for a boiler and a volume with maintained temperature and pressure is avoided.

[0028] The main heating method used is by means of an electromagnetic induction device made in different versions. The flows to be vaporised or heated are sent directly tothis device, reducing the volumes involved and making the device quick to respond to the demand for steam or hot water.

[0029] The power to the inductor is controlled on the basis of demand and on maintaining the set temperatures for the steam and for the supplying of the hot water line and of the line for the water supplying the coffee dispensing dosers. The solution of the invention makes it possible to overcome the limitation referred to in point 7) by differentiating the steam line from the water line, thus making it possible to obtain high-temperature steam that allows a large amount of heat supply to the liquids to be heated without significant condensation.

[0030] Brief description of the drawings

[0031] Further features of the invention will be made clearer by the detailed description that follows, referred to embodiments thereof purely by way of non-limiting example illustrated in the accompanying drawings, in which:

[0032] Fig. 1 - Diagram of a coffee machine according to the prior art;

[0033] Fig. 2 - Diagram of a coffee machine according to the invention, which provides a single induction heating element for all the fluid lines to be heated;

[0034] Fig. 3 - Diagram of a coffee machine according to an alternative embodiment of the invention, in which the heating unit is made up of two elements immersed in a single coil that generates the electromagnetic field and characterised by dimensions and shape such as to couple a different power for the steam line and the water lines in such a way as to adapt the system to the power necessary for the two circuits;

[0035] Fig. 3a - Schematic view from the left of the heating unit of Fig. 3;

[0036] Fig. 4 - Diagram of a coffee machine according to the invention, alternative to that of Fig. 3, in which one or both heating elements immersed in a single coil are capable of movement;

[0037] Fig. 5 - Diagram of a coffee machine according to a further embodiment of the invention, alternative to those of Fig. 3 and Fig. 4, in which the two elements are immersed in a staggered position one in relation to the other in a single axially movable coil;

[0038] Fig. 6 - Diagram of a coffee machine according to a further embodiment of theinvention, in which two induction heaters are provided, one dedicated to steam generation and one dedicated to hot water generation with independent circuits, one for supplying the hot water line and multiple circuits (one for each dispenser) for the water supplying the dispensers;

[0039] Fig. 7 - Improvement diagram of the embodiment of Fig. 6, in which an element for fine conditioning of the line provided with a heater and a cold mixing line is placed on each line for supplying the dispensing units;

[0040] Fig. 8 - Schematic drawing of the steam generation and water heating unit according to the embodiment of the invention shown in the diagram in Figure 2;

[0041] Fig. 9 - Schematic drawing of the steam generation unit according to the embodiments of the invention shown in the diagrams of Figures 3, 4, 5, 6, 7;

[0042] Fig.10 - Schematic diagram of the heating unit of the water lines according to the embodiments of the invention shown in the diagrams of Figures 3, 4, 5, 6, 7;

[0043] Fig. 11 - Diagram of the pressure levels on the steam line.

[0044] Detailed description of the invention

[0045] Referring to the accompanying drawings, a description will now be given in greater detail of the coffee machine according to the present invention, in its various embodiments.

[0046] The embodiment shown in Figure 2 is first described, in which a single device with induction heating (6) is used to produce steam and hot water for the dosers and for the hot water line.

[0047] Two supply lines (Al) and (A2) branch off from the supply line (A), the first for supplying the steam production line, the second for supplying the hot water line and the lines for the water supplying the coffee dispensing dosers.

[0048] On line (Al) are, in sequence, a pressure reducing valve (2) with a regulation range comprised between 1 and 5 bar, calibrated to the value at which the steam is to be dispensed (1.5 - 2.5 bar), a non-return valve (3) and, optionally, a pressure gauge (7) for displaying the pressure value.

[0049] Line (Al) enters the device with induction heating (6) provided with a coil (8) forthe generation of the electromagnetic field that couples with the device (6). At the outlet of the device (6), in proximity of the outlet of the steam line a thermocouple (T2) is placed, used for control of the power to be supplied to the device. The following devices are placed on the steam line denoted by (D): a valve (11) for purging air from the system, a pressure transducer (12), an overpressure safety valve (13), an overpressure control solenoid valve (16) and, finally, a resistance heater (14) for maintaining the temperature of the line up to the steam dispenser. Line (D) feeds the steam dispenser of the machine. Steam is dispensed by means of a solenoid valve (15) or, alternatively, a manual valve.

[0050] Figure 11 illustrates the pressure levels of the system: pressure pO is the calibration pressure of the pressure reducing valve (2) on the supply line, equal to the pressure value of the steam to be dispensed; pl is the maximum working pressure beyond which power is removed from the steam generator; p2 is the pressure at which the safety solenoid valve (16) intervenes; p3 is the trigger pressure of the safety valve (13). During the phases of start-up or after a phase of water supply from the circuit (Al) following a demand for steam, the pressure in the circuit tends to rise above the nominal working value pO as a consequence of heating.

[0051] The pressure transducer (12) is used to calibrate the pressure of the reducing valve (2) and to check the pressure level on the line during functioning, during the phases of start-up or after a phase of water supply from the circuit (Al). Following a demand for steam, the pressure in the circuit tends to rise above the nominal working value pO as a consequence of heating. In the case where the pressure reading exceeds the maximum working pressure limit pl selected for the steam, the control cuts the power to the coil (8). If the pressure read on the sensor exceeds the value p2, the control actuates the pressure relief solenoid valve (16). The solenoid valve is closed again when the pressure drops below the value p2. The power to the device is controlled using the thermocouple (T2) placed on the outlet of the steam line. The power to the generator is regulated with a PID (proportional-integral-derivative) controller, having as set point the required steam temperature and as control temperature the temperature read on the thermocouple (T2).

[0052] The following are located in sequence on line (A2): a supply pump (1) that is actuated whenever dispensing is demanded on the line of hot water or on the line forwater supplying the coffee dispensing units; a check valve (4) that prevents inverse flow when the pump is off; a maximum pressure valve (5), whose function is to discharge the excess pressure generated when the water between the check valve and the dispensing valves is heated, increasing the pressure; an optional pressure switch (7) and finally the heating device (6), in common with the steam line (Al), provided with coil (8) for generating the electromagnetic field that couples with the heater (6). The line of supply to the heating device is divided into a series of independent lines inside the heater. The first line (B) is dedicated to supplying hot water for the production of hot beverages, while the remaining lines (Cl, C2, C3, ....) are dedicated to supplying hot water to the dispensing units: each line supplies a single dispensing unit.

[0053] Line (B), which supplies the hot water line, is provided with a solenoid valve (17) or a manual valve for dispensing. Each of the lines (Cl, C2, C3, ...) that supply the lines of hot water to the dispensers is provided with a 3-way solenoid valve (18) whose function is: a) to discharge the residual pressure in the dispenser, rest condition of the solenoid valve, b) to place in communication the supply line with the dispenser.

[0054] The power to the heating and steam generation unit (6) is controlled as described previously on the basis of a PID controller that takes as reference value the set point of the required steam temperature and as control temperature the temperature read on the thermocouple (T2). A thermocouple (Tl) placed on the outlet of the heating unit is used in this configuration for the sole purpose of monitoring. The balancing of the two temperatures is determined by the geometry of the device as described subsequently. The line pressure is defined in such a way that the output temperature from the hot water production unit does not reach the boiling point. This temperature is preferably chosen in a range between 100 and 105°C.

[0055] The heating and steam generation device (6) is made up of a body preferably cylindrical in shape in magnetic stainless steel (e.g. AISI 400 series, chromium stainless steel) in which the supply conduits for lines (D) (steam line), (B), (Cl, C2, C3, ...) are formed.

[0056] Figure (8) schematically illustrates a solution in which, in the body (10), the steam line (D) is preferably formed in the periphery of the cylinder where there is the mostconcentration of heat production by means of electromagnetic induction induced by the coil (8). The path (20) of the steam line has a helical trend, so as to obtain a large heat exchange surface. At the end of the path there is a chamber (21) for accumulation of the steam in order to reduce pressure fluctuations when the dispensing valve is opened. The helical path (20) is fed by the inlet (22) and discharge takes place through the outlet (23). On the outside, the helical conduit is closed by a jacket (40).

[0057] The paths of the water (30) for supplying the lines (D), (Cl, C2, C3, ...), are placed further inside the cylinder in such a way that, by regulating the temperature on the thermocouple (T2) for the steam line, a temperature close to the desired values for the water lines (100°C - 105°C) is obtained on the internal lines. The length of the lines and, consequently, of the device, and their radial position with respect to the centre are adapted for this purpose. The lines are supplied from the inlet (32) towards a cavity (34) and discharge into a cavity (35) and from there towards the outlet (33). Inside each line, it is possible to install a turbulence promoter, such as a mixer, Pall rings, and the like, to improve the heat exchange coefficient. The device must have an adequate mass for creating a thermal flywheel effect such as to limit the temperature variations of the steam dispensed.

[0058] Referring now to Figure 3, a description is given of an embodiment derived from the embodiment of Figure 2, in which the device is divided into two parts (6'), (6") and inserted into a single electromagnetic induction coil (8). Two supply lines (Al) and (A2) branch off from the supply line (A), the first for supplying the steam production line and connected to element (6'), the second for supplying the hot water line and the lines for the water supplying the coffee dispensing dosers and connected to element (6").

[0059] The object of this solution is to create two elements (6'), (6") with different dimensions and geometries in such a way as to couple different powers balanced in such a way that it is possible, by adjusting the thermocouple T2 of the steam line device (6'), to obtain a temperature for the device (6") read on the thermocouple T1 close to the optimal values defined at the design stage. The regulation of the power supplied by the inductor is a consequence of the PID adjustment made on the steam temperature.Figure 4 shows an embodiment derived from the embodiment shown in Figure 2 in which the device is divided into two parts (6'), (6") and inserted into a single electromagnetic induction coil (8). Two supply lines (Al) and (A2) branch off from the supply line (A), the first for supplying the steam production line and connected to element (6'), the second for supplying the hot water line and the lines for the water supplying the coffee dispensing dosers and connected to element (6").

[0060] The object of this solution is to create two elements (6'), (6") that can be moved independently inside the coil in such a way as to vary the coupling between the internal elements and the coil and, consequently, vary the power distribution between the two elements. With this embodiment, unlike the embodiments of Figure 2 and Figure 3, it is possible to independently regulate the temperature of the two elements (6') and (6"). Each of the elements has its own PID regulator with temperature set point and, as control signal, the temperature read on the thermocouple (T2) for the steam generator and on the temperature (Tl) for the water lines heater.

[0061] Referring to Figure 5, a description is given of an embodiment derived from the embodiment of Figure 2, in which the heating device is divided into two parts (6'), (6") and inserted into a single electromagnetic induction coil (8). Two supply lines (Al) and (A2) branch off from the supply line (A), the first for supplying the steam production line and connected to element (6'), the second for supplying the hot water line and the lines for the water supplying the coffee dispensing dosers and connected to element (6").

[0062] The object of this solution is to create two elements (6'), (6") staggered one in relation to the other and inserted into a single mobile coil in such a way as to vary the coupling between the internal elements and the coil and consequently vary the distribution of the power between the two elements. Moving the coil towards one of the two elements increases the coupling with it and consequently the power transferred. With this solution, as with the embodiment of Figure 4, it is possible to independently regulate the temperature of the two elements (6') and (6"). Each of the elements has its own PID regulator with temperature set point and, as control signal, the temperature read on the thermocouple (T2) for the steam generator and on the temperature (Tl) for the water lines heater.The solution illustrated in Figure 6 is wholly similar to that of Fig. 3, in which each line (Al), (A2) is provided with a respective dedicated generator (6'), (6"), with the substantial difference that each generator is provided with its own independently controlled coil (8'), (8").

[0063] On the line (Al) is placed the steam generator (6') provided with the coil (8') for generating the electromagnetic field that couples with the generator (6'), and on the line (A2) is placed the hot water generator (6") for the production of hot beverages and to supply hot water to the dispensing units, equipped with the coil (8") for generating the electromagnetic field that couples with the heater (6").

[0064] A thermocouple (T2) placed at the outlet of the steam generator (6') is used for the control of the power to be supplied to the steam generator. The power to the generator is regulated by a PID controller, having as set point the required steam temperature and as control temperature the temperature read on the thermocouple (T2).

[0065] The power to the hot water production unit (6") is controlled on the basis of a PID controller in view of a temperature set point and a control value read with a thermocouple T1 placed on the outlet of the heating unit (6").

[0066] Figure 7 shows an improved solution of the diagram of Figure 6, applicable to all the embodiments previously illustrated with reference to Figures 2 to 5. On each of the lines (Cl, C2, C3, ...) a device (19) is placed for fine conditioning of the line whose object is to correct the water temperature, bringing it to the required value. The water temperature could be different from the target temperature mainly due to intermittent demand and, in the case of the diagram of Figure 2, with a single element having the dual function of steam generator and hot water producer, also as a consequence of the priority of control of the power to ensure the steam temperature. The device (19) connected to the line is made up of a body through which the water to be conditioned passes, an electric resistance heater, a cold water supply line controlled by a solenoid valve (29) and a thermocouple (TCI, TC2, TC3, ...). The control of the equipment as a function of the target temperature and the temperature read on the thermocouple by means of a PID regulator feeds power into the system by means of the heater if the actual temperature is lower than the requiredtemperature or feeds cold water by means of the supply solenoid valve (29) if the actual temperature is higher than the required temperature. The supply solenoid valve is directly connected to the line supplied by the pump (1) in such a way that the pressure is sufficient in order to be able to supply the line of the dosers. The solenoid valve (29) is supplied intermittently on the basis of the control during the phase of supply of the dispensers. To avoid high flows, the valve can be provided with a flow rate limiting diaphragm. Furthermore, downstream of the injection of cold water, in order to improve mixing, the device can be provided with a mixing promoter, such as for example a series of Pall rings or similar devices.

[0067] Figures 9 and 10 schematically illustrate embodiment solutions for the steam generator (6') and water heater (6"), respectively, consisting of separate elements, as shown in the embodiments of Figures 3 to 7.

[0068] In these drawings, the same reference numerals used in Fig. 8 have been used, as far as possible, relating to the embodiment of Fig. 2, in which a single heating device is provided for the production of steam and hot water.

[0069] Figure 9 schematically illustrates an embodiment solution for the steam generator, made up of a main body (10) in which a helical path (20) is formed, closed on the outside by the jacket (40) and supplied by the inlet (22). At the end of the path (20) there is a steam accumulation chamber (21), which is discharged through the outlet 23. As in the case of Fig. 8, this chamber (21) is used to reduce pressure fluctuations when the dispensing valve is opened.

[0070] Figure (10) schematically illustrates an embodiment solution for the water heater in which in the body (10) conduits (30) are formed on the periphery for the passage of water, which are supplied by a chamber (34) and discharge into a chamber (35), both cylindrical and placed at the ends of the body (10). The supply takes place via the inlet (32) and the discharge via the outlet (33).

[0071] The length of the conduits (30) inside the cylindrical body (10) is determined in order to obtain the heat exchange surface necessary to achieve in output the required water temperature conditions with the flow rates and frequency of demand for each line. A series of turbulence promoters (36) can be installed inside each line, as indicated in the lower channel of the drawing, such as a mixer, Pall rings, and thelike, to improve the heat exchange coefficient.

[0072] From what has been disclosed above, the advantages of the coffee machine for professional use according to the present invention are clear, which avoids the need for a boiler and a volume maintained at temperature and pressure with the relative disadvantages described above, providing for the direct generation of steam by superheating a controlled flow of water and directly heating the water to be used for the supply of the line for the water supplying the coffee dispensing dosers and for the hot water to be used for hot beverages.

[0073] Naturally the present invention is not limited to the particular embodiments previously described and illustrated in the accompanying drawings, but numerous detailed changes can be made thereto, within the reach of the person skilled in the art, without thereby departing from the scope of the invention itself, as defined in the accompanying claims.

Claims

CLAIMS1. Coffee machine for professional use, for the production of hot water to be sent to a hot water line (B) for the preparation of beverages or to coffee dispensing lines (C) by passing hot water through respective dosers, and for the generation of steam sent in a line (D), said machine comprising a water supply line (A), from which a first line (Al) branches off for the supply of the steam production line (D) and a second line (A2) branches off for the supply of the hot water line (B) and the lines (C) for the water supplying the coffee dispensing dosers, characterised in that said first and second lines (Al), (A2) enter at least one device in magnetic material (6; 6', 6") and at least one coil (8; 8', 8") is provided for generating an electromagnetic field that couples with said at least one device (6; 6', 6") to superheat by induction the water in said first supply line (Al) to directly generate the steam to be sent in said line (D) and to heat by induction the water in said second supply line (A2) for the sending to the hot water line (B) and to the lines for the water supplying the dosers (C).

2. Machine according to claim 1, characterised in that a single coil (8) is provided that winds around a single device in magnetic material (6) acting as steam generator for said first line (Al) and as hot water generator for said second line (A2).

3. Machine according to claim 1, characterised in that a single coil (8) is provided which winds around a steam generator device (6’), into which said first line (Al) flows, and a hot water generator device (6”), into which said second line (A2) flows.

4. Machine according to claim 3, characterised in that said steam generator device (6') and said hot water generator device (6") are mounted movably in said coil (8).

5. Machine according to claim 3, characterised in that said steam generator device (6') and said hot water generator device (6") are staggered one in relation to the other and said coil (8) that winds around them is mounted so as to be axially movable.

6. Machine according to claim 1, characterised in that a first coil (8') is provided which winds around a steam generator device (6'), into which said first line (Al) flows, and a second coil (8") which winds around a hot water generator device (6"), into which said second line (A2) flows.

7. Machine according to any one of the preceding claims, characterised in that on said first line (Al) for the supply of the steam production line (D) there are, in sequence: a pressure reducing valve (2), a non-return valve (3), optionally a pressure gauge (7) for displaying the pressure value, and the following devices are on the steam line (D): a valve (11) for purging air from the system, a pressure transducer (12), an overpressure safety valve (13), an overpressure control solenoid valve (16) and, finally, a resistance heater (14) for maintaining the temperature of the line up to the steam dispenser.

8. Machine according to any one of the preceding claims, characterised in that the following are placed in sequence on said second line (A2): a supply pump (1) which is actuated whenever a supply is requested on the hot water line (B) or on one of the lines (C) for the water for the supply of the coffee dispensing dosers, a check valve (4) that prevents reverse flow when the pump is off, a maximum pressure valve (5), whose function is to discharge the excess pressure generated when the water between the check valve and the dispensing valves is heated, increasing the pressure, and an optional pressure switch (7); on said hot water line (B) a solenoid valve (17) or a manual dispensing valve is provided; and on each of said lines (C) for supply of the hot water to the dispensers a 3-way solenoid valve (18) is provided to discharge the residual pressure in the dispenser or to place in communication the supply line with the dispenser.

9. Machine according to any one of the preceding claims, characterised in that on each of the lines (C) for supply of hot water to the dispensers a device (19) is placed for fine conditioning of the line to correct the water temperature, bringing it to the required value, said device (19) being made up of a body in which the water to be conditioned passes, an electric resistance heater, a cold water supply line controlled by a solenoid valve (29) and a thermocouple (TC).

10. Machine according to any one of the preceding claims, characterised in that in said device in magnetic material (6; 6', 6"), in proximity of the outlet of the steam line (D), a thermocouple (T2) is placed, and in proximity of the outlet of the heater of the hot water lines (B), (C) a thermocouple (Tl) is placed, said thermocouple (T2) being used for the control of the power to be supplied to the device (6) according to claim 2 or to the steam generator (6') according to any one of claims 3 to 6 , and said thermocouple(Tl) being used for the control of the power to be supplied to the hot water generator device (6”) according to any one of claims 3 to 6, said controls being carried out on the basis of PID controllers against a temperature set point and a control value read on the thermocouple (T2) or (Tl), respectively.

11. Machine according to claim 2, characterised in that said steam generation and heating device (6) is made up of a body of cylindrical shape (10) in magnetic stainless steel, in which the steam line (D) is formed in the periphery of the cylinder with a path (20) with helical trend, at the end of which there is a steam accumulation chamber (21) to reduce pressure fluctuations at the time of dispensing, said helical path (20) being supplied by an inlet (22) and discharge takes place via an outlet (23), while the hot water lines (B), (C) are supplied by paths (33) arranged further inside the cylinder.

12. Machine according to any one of claims 3 to 6, characterised in that said steam generator device (6') is made up of a body (10) in magnetic stainless steel, in which a helical path (20) is formed, arranged in the periphery of the cylinder, supplied by an inlet (22) and ending in a steam accumulation chamber (21) to reduce pressure fluctuations at the time of dispensing, which takes place via an outlet (23), and in that said water heater device (6”) is made up of a body (10) in magnetic stainless steel, in which conduits (30) are formed on the periphery for the passage of water, which are supplied by a chamber (34) and discharge into a chamber (35), both cylindrical and placed at the ends of the body (10), with the supply taking place via an inlet (32) and the discharge via an outlet

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