Mechanical variable-pressure waterway structure of coffee machine and coffee machine

Abstract

The utility model relates to a mechanical variable-pressure waterway structure and a coffee machine, a distribution waterway is used for receiving liquid input by a water supply waterway and distributing the liquid to a variable-pressure waterway and a steam waterway, and the variable-pressure waterway is used for regulating the pressure of the liquid input by the distribution waterway and inputting the liquid to an extraction waterway at a set water pressure; the extraction water path is used for heating input liquid so as to output hot water; the steam water path is used for heating input liquid to generate steam; the drainage waterway is used for discharging waste water and / or releasing pressure of the system and / or discharging condensate water; the water supply waterway comprises a water tank, a first two-way electromagnetic valve, a first three-way connector and a water pump; a water inlet and a water outlet of the first two-way electromagnetic valve are communicated with an external water source and a first water inlet of the first three-way connector through two branch pipes respectively, and a water outlet of the water tank is communicated with a second water inlet of the first three-way connector sequentially through a first one-way valve and the two branch pipes. A water outlet of the first three-way connector is communicated with a water inlet of the water pump through a two-way pipe.

Description

Technical Field

[0001] This utility model relates to the field of coffee machine technology, and in particular to a mechanical variable pressure water circuit structure for a coffee machine and a coffee machine. Background Technology

[0002] Most mechanical variable pressure water circuit motors on the market are of the vibratory pump structure. In the mode of switching between tap water and water tank, a two-way solenoid valve is used for switching. However, due to the different working characteristics of rotary vane pumps compared to vibratory pumps, if a three-way solenoid valve is used to switch between tap water and water tank, when the transformer is in a low-pressure state, the rotary vane pump will experience a mismatch between the inlet and outlet water volumes. The low-pressure discharge of the transformer valve will be much greater than the inlet water of the pump. Since the diameter of a typical three-way solenoid valve is about 1.2~3.0mm, this results in a small water volume passing through the solenoid valve, insufficient water supply to the pump, abnormal noise from the motor head, overheating, and a shortened lifespan. Utility Model Content

[0003] Therefore, it is necessary to provide a mechanical variable pressure water circuit structure for a coffee machine and a coffee machine in response to the above problems.

[0004] The first aspect of this application provides a mechanical variable pressure water circuit structure for a coffee machine, the mechanical variable pressure water circuit structure including a water supply circuit, a variable pressure water circuit, a distribution water circuit, a steam water circuit, an extraction water circuit and a drainage water circuit;

[0005] The distribution water circuit is used to receive the liquid input from the water supply circuit and distribute it to the pressure-changing water circuit and the steam water circuit. The pressure-changing water circuit is used to regulate the pressure of the liquid input from the distribution water circuit and input the liquid to the extraction water circuit at a set water pressure. The extraction water circuit is used to heat the input liquid to output hot water to the coffee extraction module. The steam water circuit is used to heat the input liquid to generate steam. The drainage water circuit is used to discharge wastewater and / or system pressure relief and / or condensate discharge.

[0006] The water supply circuit includes a water tank, a first two-way solenoid valve, a first three-way connector, and a water pump; the inlet and outlet of the first two-way solenoid valve are respectively connected to an external water source and the first inlet of the first three-way connector through a two-point pipe; the outlet of the water tank is connected to the second inlet of the first three-way connector through a first one-way valve and a two-point pipe; and the outlet of the first three-way connector is connected to the inlet of the water pump through a two-point pipe.

[0007] In one embodiment, the water pump is a rotary pump.

[0008] In one embodiment, the first tee connector is a two-way tee connector structure, and the first one-way valve is a two-way one-way valve.

[0009] In one embodiment, the water distribution circuit includes a second one-way valve, a first protective valve, and a second two-way solenoid valve. The first protective valve has a one-inlet and three-outlet structure. The outlet of the water pump is connected to the inlet of the first protective valve through the second one-way valve. The first outlet of the first protective valve is connected to the variable pressure water circuit. The second outlet of the first protective valve is connected to the drainage water circuit. The third outlet of the first protective valve is connected to the steam water circuit through the second two-way solenoid valve.

[0010] In one embodiment, the variable pressure water circuit includes a variable pressure valve, a third two-way solenoid valve, a second three-way connector, and a first three-way solenoid valve. The first outlet of the first protective valve is connected to the inlet of the second three-way connector. The second outlet of the second three-way connector is connected to the inlet of the variable pressure valve through the third two-way solenoid valve. The outlet of the variable pressure valve is connected to the inlet of the first three-way solenoid valve. The second outlet of the first three-way solenoid valve is connected to the inlet of the water tank. The first outlet of the first three-way solenoid valve is connected to the drainage water circuit. The first outlet of the second three-way connector is connected to the extraction water circuit.

[0011] In one embodiment, the extraction water circuit includes a heating pot, a water outlet solenoid valve, a flow regulating valve, a pressure gauge, and a fourth two-way solenoid valve. The water outlet solenoid valve is a three-way solenoid valve. The first outlet of the second three-way connector is connected to the water inlet of the heating pot. The first outlet of the heating pot is connected to the water inlet of the water outlet solenoid valve. The second outlet of the water outlet solenoid valve is connected to the drainage water circuit. The first outlet of the water outlet solenoid valve is connected to the water inlet of the flow regulating valve, and the water inlet of the flow regulating valve is also connected to the pressure gauge. The outlet of the flow regulating valve is connected to the brewing water outlet of the heating pot. The second outlet of the heating pot is connected to the hot water outlet through the fourth two-way solenoid valve.

[0012] In one embodiment, the drainage water path includes a third three-way connector and a drain nozzle. The drain nozzle has a three-inlet and one-outlet structure. The second outlet of the first protective valve is connected to the first inlet of the third three-way connector. The second inlet of the third three-way connector is connected to the steam water path. The outlet of the third three-way connector is connected to the first inlet of the drain nozzle. The second inlet of the drain nozzle is connected to the second outlet of the water outlet solenoid valve. The third inlet of the drain nozzle is connected to the first outlet of the first three-way solenoid valve.

[0013] In one embodiment, the steam water circuit includes a steam boiler, a second protective valve, an exhaust valve, and a fifth two-way solenoid valve. The inlet of the steam boiler is connected to the outlet of the second two-way solenoid valve. The steam boiler is connected to the second inlet of the third three-way connector through the second protective valve. The steam boiler is connected to the outside atmosphere through the exhaust valve. The steam boiler is connected to the steam outlet through the fifth two-way solenoid valve.

[0014] A second aspect of this application provides a coffee machine including the mechanical variable pressure water circuit structure of any of the coffee machines described above.

[0015] The mechanical variable pressure water circuit structure in each of the above embodiments has at least the following advantages:

[0016] The water tank is connected to the water pump sequentially via the first one-way valve and the first three-way connector. External water sources, such as tap water, are connected to the water pump sequentially via the first two-way solenoid valve and the first three-way connector. Therefore, the pipeline connections between the tap water and the water tank and the water pump are closed, preventing air from entering and ensuring that the water pump can continuously draw water. By using two-point pipes for all pipes before entering the water pump, and using the first two-way solenoid valve and the first one-way valve to switch between tap water and water tank water, the use of a three-way solenoid valve is not required. Even if the variable pressure water circuit is in a low-pressure state, the water volume input to the water pump can still be ensured, avoiding problems such as low-pressure abnormal noise, overheating, and inability to draw water. In addition, replacing the three-way solenoid valve with the first two-way solenoid valve and the first one-way valve can reduce product costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the mechanical variable pressure water circuit structure of a coffee machine in one embodiment;

[0018] Figure 2 This is a schematic diagram of the mechanical variable pressure water circuit structure of a coffee machine in one embodiment.

[0019] The correspondence between the reference numerals and the component names is as follows:

[0020] 10 water supply circuits, 20 variable pressure water circuits, 30 distribution water circuits, 40 steam water circuits, 50 extraction water circuits, and 60 drainage water circuits.

[0021] 11 Water tank, 12 First two-way solenoid valve, 13 First three-way connector, 14 Water pump;

[0022] 21 Transformer valve, 22 Third two-way solenoid valve, 23 Second three-way connector, 24 First three-way solenoid valve;

[0023] 31 Second check valve, 32 First protective valve, 33 Second two-way solenoid valve;

[0024] 41 Steam boiler, 42 Second protection valve, 43 Exhaust valve, 44 Fifth two-way solenoid valve;

[0025] 51 Heating pot, 52 Water outlet solenoid valve, 53 Flow regulating valve, 54 Pressure gauge, 55 Fourth two-way solenoid valve;

[0026] 61 Third tee connector, 62 Drain nozzle. Detailed Implementation

[0027] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0029] The mechanical variable pressure water circuit structure of some embodiments of the present invention is described below with reference to the accompanying drawings.

[0030] like Figures 1 to 2 As shown, this embodiment discloses a mechanical variable pressure water circuit structure for a coffee machine, including a water supply circuit 10, a variable pressure water circuit 20, a distribution water circuit 30, a steam water circuit 40, an extraction water circuit 50, and a drainage water circuit 60.

[0031] The distribution water circuit 30 is used to receive the liquid input from the water supply circuit 10 and distribute it to the pressure-regulating water circuit 20 and the steam water circuit 40. The pressure-regulating water circuit 20 is used to regulate the pressure of the liquid input from the distribution water circuit 30 and input the liquid to the extraction water circuit 50 at a set water pressure. The extraction water circuit 50 is used to heat the input liquid to output hot water to the coffee extraction module. The steam water circuit 40 is used to heat the input liquid to generate steam. The drainage water circuit 60 is used to discharge wastewater and / or system depressurization and / or condensate discharge.

[0032] The water supply circuit 10 includes a water tank 11, a first two-way solenoid valve 12, a first three-way connector 13, and a water pump 14. The inlet and outlet of the first two-way solenoid valve 12 are connected to an external water source and the first inlet of the first three-way connector 13 respectively through a two-point pipe. The outlet of the water tank 11 is connected to the second inlet of the first three-way connector 13 in sequence through a first one-way valve 15 and a two-point pipe. The outlet of the first three-way connector 13 is connected to the inlet of the water pump 14 through a two-point pipe.

[0033] This application discloses a mechanical variable pressure water circuit structure for a coffee machine. The water tank 11 is connected to the water pump 14 via a first one-way valve 15 and a first three-way connector 13. An external water source, such as tap water, is connected to the water pump 14 via a first two-way solenoid valve 12 and a first three-way connector 13. Therefore, the pipe connection between the tap water and the water tank 11 and the water pump 14 is closed, preventing air from entering and ensuring that the water pump 14 can continuously draw water. By using two-point pipes for all pipes before entering the water pump 14, and using the first two-way solenoid valve 12 and the first one-way valve 15 to switch between tap water and water tank 11, the use of a three-way solenoid valve is not required. Even if the variable pressure water circuit 20 is in a low-pressure state, the amount of water input to the water pump 14 can still be ensured, avoiding problems such as low-pressure abnormal noise, overheating, and inability to draw water from the water pump 14. In addition, by using the first two-way solenoid valve 12 and the first one-way valve 15 instead of a three-way solenoid valve, the product cost can be reduced.

[0034] The coffee extraction module utilizes hot water from the heating pot to extract coffee grounds. For example, the coffee extraction module may include a brewing handle and a filter. The filter can be mounted on the brewing handle, which is attached to the heating pot, allowing the brewing water output from the heating pot to be delivered to the filter, thereby extracting the coffee grounds.

[0035] It should be noted that the inner diameter of the 1 / 2-inch pipe is not a fixed value and needs to be determined in conjunction with the pipe type and wall thickness. The inner diameter of the 1 / 2-inch pipe is usually between 3 and 5 mm. The 1 / 2-inch pipe in this application is a PE pipe, and its inner diameter is 4.3 mm.

[0036] In addition to the features of the above embodiments, this embodiment further specifies that the water pump 14 is a rotary pump.

[0037] The mechanical pressure-changing water circuit structure of the coffee machine in the above embodiment limits the water pump 14 to adopt a rotary pump structure. Based on this, the flow difference between the tap water and the water tank 11 can be smoothly handled, avoiding sudden pressure changes. In addition, the rotary pump structure can provide stable pressure for both the steam water circuit 40 and the extraction water circuit 50 at the same time.

[0038] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the first tee connector 13 is a two-way tee connector structure, and the first one-way valve 15 is a two-way one-way valve.

[0039] like Figures 1 to 2As shown, in addition to the features of the above embodiments, this embodiment further defines: the water distribution circuit 30 includes a second one-way valve 31, a first protection valve 32, and a second two-way solenoid valve 33. The first protection valve 32 has a one-inlet and three-outlet structure. The outlet of the water pump 14 is connected to the inlet of the first protection valve 32 through the second one-way valve 31. The first outlet of the first protection valve 32 is connected to the variable pressure water circuit 20. The second outlet of the first protection valve 32 is connected to the drainage water circuit 60. The third outlet of the first protection valve 32 is connected to the steam water circuit 40 through the second two-way solenoid valve 33.

[0040] The second one-way valve 31 is used to prevent backflow; the first protection valve 32 is used to distribute pressurized water flow to the steam water circuit 40, the variable pressure water circuit 20, and the drainage water circuit 60 according to functional requirements. Specifically, the three outlets of the first protection valve 32 are connected to the variable pressure water circuit 20, the drainage water circuit 60, and the steam water circuit 40, respectively. When the user starts the steam function, the second two-way solenoid valve 33 is energized and opened, and the water pump 14 outputs high-pressure water flow into the steam boiler 41. When the system pressure exceeds the threshold, the water pump 14 outputs high-pressure water flow into the drainage water circuit 60 to drain and release pressure, or actively opens the channel between the first protection valve 32 and the drainage water circuit 60 for cleaning or shutdown drainage. Under normal conditions, the first protection valve 32 prioritizes directing the water flow output by the water pump 14 to the variable pressure water circuit 20 for extraction or output of hot water.

[0041] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further defines: the variable pressure water circuit 20 includes a variable pressure valve 21, a third two-way solenoid valve 22, a second three-way connector 23, and a first three-way solenoid valve 24. The first outlet of the first protection valve 32 is connected to the inlet of the second three-way connector 23. The second outlet of the second three-way connector 23 is connected to the inlet of the variable pressure valve 21 through the third two-way solenoid valve 22. The outlet of the variable pressure valve 21 is connected to the inlet of the first three-way solenoid valve 24. The second outlet of the first three-way solenoid valve 24 is connected to the inlet of the water tank 11. The first outlet of the first three-way solenoid valve 24 is connected to the drainage water circuit 60. The first outlet of the second three-way connector 23 is connected to the extraction water circuit 50.

[0042] The third two-way solenoid valve 22 is used to control whether the water flow enters the pressure regulating valve 21 or flows directly to the heating pot 51 in the extraction water circuit 50. When the third two-way solenoid valve 22 is open, the coffee machine is in the pressure regulating extraction mode, and the water flows through the third two-way solenoid valve 22, the pressure regulating valve 21, and the first three-way solenoid valve 24 in sequence. When the third two-way solenoid valve 22 is closed, the coffee machine is in the rapid heating mode, and the water flows directly into the heating pot 51 in the extraction water circuit 50 through the first outlet of the second three-way connector 23 for heating.

[0043] The first three-way solenoid valve 24 is used to control the destination of water after it exits from the pressure transformer valve 21. Specifically, when the first outlet of the first three-way solenoid valve 24 is opened, unused water is recycled to the water tank 11; when the second outlet of the first three-way solenoid valve 24 is opened, drainage is achieved.

[0044] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further defines: the extraction water circuit 50 includes a heating pot 51, a water outlet solenoid valve 52, a flow regulating valve 53, a pressure gauge 54, and a fourth two-way solenoid valve 55. The water outlet solenoid valve 52 is a three-way solenoid valve. The first outlet of the second three-way connector 23 is connected to the water inlet of the heating pot 51. The first outlet of the heating pot 51 is connected to the water inlet of the water outlet solenoid valve 52. The second outlet of the water outlet solenoid valve 52 is connected to the drainage water circuit 60. The first outlet of the water outlet solenoid valve 52 is connected to the water inlet of the flow regulating valve 53. The water inlet of the flow regulating valve 53 is also connected to the pressure gauge 54. The outlet of the flow regulating valve 53 is connected to the brewing water outlet of the heating pot 51. The second outlet of the heating pot 51 is connected to the hot water outlet through the fourth two-way solenoid valve 55.

[0045] Specifically, when the user selects to make coffee, the water pump 14 sends water into the second three-way connector 23, directing it to the water inlet of the heating pot 51. After the heating pot 51 heats the water, it flows out from the first outlet to the outlet solenoid valve 52. At this time, the outlet solenoid valve 52 closes the drain outlet, and the water passes through the flow regulating valve 53 and the pressure gauge 54 before entering the brewing water outlet for extraction. Simultaneously, the pressure gauge 54 monitors the water pressure, and the user or system controls the water pressure and flow rate by adjusting the flow regulating valve 53. When cleaning or draining is required, the outlet solenoid valve 52 opens the drain outlet, and the water is discharged directly without entering the brewing water outlet. When hot water is needed, the fourth solenoid valve opens, allowing hot water to flow from the second outlet of the heating pot 51 to the hot water outlet.

[0046] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further defines: the drainage water path 60 includes a third three-way connector 61 and a drain nozzle 62. The drain nozzle 62 has a three-inlet and one-outlet structure. The second outlet of the first protection valve 32 is connected to the first inlet of the third three-way connector 61. The second inlet of the third three-way connector 61 is connected to the steam water path 40. The outlet of the third three-way connector 61 is connected to the first inlet of the drain nozzle 62. The second inlet of the drain nozzle 62 is connected to the second outlet of the water outlet solenoid valve 52. The third inlet of the drain nozzle 62 is connected to the first outlet of the first three-way solenoid valve 24.

[0047] Among them, the drain nozzle 62 is connected to the second outlet of the first protection valve 32 through the third three-way connector 61, and is used to release pressure and drain water when the steam boiler 41 is overpressured or the water pump 14 is overloaded; the drain nozzle 62 is connected to the second protection valve 42 in the steam water circuit 40 through the third three-way connector 61, and is used to discharge the condensate formed in the pipe in the steam water circuit 40; the second outlet of the water outlet solenoid valve 52 and the first outlet of the first three-way solenoid valve are connected to the second inlet and the third inlet of the drain nozzle 62, respectively, and are used to drain water from the extraction water circuit 50 and the variable pressure water circuit 20.

[0048] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further defines: the steam water circuit 40 includes a steam boiler 41, a second protection valve 42, an exhaust valve 43, and a fifth two-way solenoid valve 44. The inlet of the steam boiler 41 is connected to the outlet of the second two-way solenoid valve 33. The steam boiler 41 is connected to the second inlet of the third three-way connector 61 through the second protection valve 42. The steam boiler 41 is connected to the outside atmosphere through the exhaust valve 43. The steam boiler 41 is connected to the steam outlet through the fifth two-way solenoid valve 44.

[0049] When the second two-way solenoid valve 33 is opened, the water pump 14 injects water into the steam boiler 41 to the preset water level and heats it. When the steam boiler 41 reaches the target pressure, the user can open the fifth two-way solenoid valve 44 to release steam for making milk foam. When the pressure of the steam boiler 41 exceeds the threshold, the second protection valve 42 is triggered and opened, and the steam or hot water in the steam boiler 41 is depressurized to the drain nozzle 62 through the third three-way connector 61. The exhaust valve 43 can be used to release air when the steam boiler 41 is initially heated to ensure that the inside is full of water, and can also be used to release residual steam pressure when the steam boiler 41 is turned off to avoid the danger of opening the lid.

[0050] This embodiment provides a coffee machine, including the mechanical variable pressure water circuit structure of the coffee machine described above.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A mechanical variable pressure water circuit structure for a coffee machine, comprising a water supply circuit (10), a variable pressure water circuit (20), a distribution water circuit (30), a steam water circuit (40), an extraction water circuit (50), and a drainage water circuit (60), characterized in that, The distribution water path (30) is used to receive the liquid input from the water supply water path (10) and distribute it to the pressure-changing water path (20) and the steam water path (40). The pressure-changing water path (20) is used to regulate the pressure of the liquid input from the distribution water path (30) and input the liquid into the extraction water path (50) at a set water pressure. The extraction water path (50) is used to heat the input liquid to output hot water to the coffee extraction module. The steam water path (40) is used to heat the input liquid to generate steam. The drainage water path (60) is used to discharge wastewater and / or system depressurization and / or condensate discharge. The water supply circuit (10) includes a water tank (11), a first two-way solenoid valve (12), a first three-way connector (13), and a water pump (14). The inlet and outlet of the first two-way solenoid valve (12) are connected to an external water source and the first inlet of the first three-way connector (13) respectively through a two-point pipe. The outlet of the water tank (11) is connected to the second inlet of the first three-way connector (13) in sequence through a first one-way valve (15) and a two-point pipe. The outlet of the first three-way connector (13) is connected to the inlet of the water pump (14) through a two-point pipe.

2. The mechanical variable pressure water circuit structure of the coffee machine according to claim 1, characterized in that, The water pump (14) is a rotary pump.

3. The mechanical variable pressure water circuit structure of the coffee machine according to claim 1 or 2, characterized in that, The first three-way connector (13) is a two-way three-way connector structure, and the first one-way valve (15) is a two-way one-way valve.

4. The mechanical variable pressure water circuit structure of the coffee machine according to claim 3, characterized in that, The distribution water circuit (30) includes a second one-way valve (31), a first protection valve (32), and a second two-way solenoid valve (33). The first protection valve (32) has a one-inlet and three-outlet structure. The outlet of the water pump (14) is connected to the inlet of the first protection valve (32) through the second one-way valve (31). The first outlet of the first protection valve (32) is connected to the variable pressure water circuit (20). The second outlet of the first protection valve (32) is connected to the drainage water circuit (60). The third outlet of the first protection valve (32) is connected to the steam water circuit (40) through the second two-way solenoid valve (33).

5. The mechanical variable pressure water circuit structure of the coffee machine according to claim 4, characterized in that, The variable pressure water circuit (20) includes a variable pressure valve (21), a third two-way solenoid valve (22), a second three-way connector (23), and a first three-way solenoid valve (24). The first outlet of the first protection valve (32) is connected to the inlet of the second three-way connector (23). The second outlet of the second three-way connector (23) is connected to the inlet of the variable pressure valve (21) through the third two-way solenoid valve (22). The outlet of the variable pressure valve (21) is connected to the inlet of the first three-way solenoid valve (24). The second outlet of the first three-way solenoid valve (24) is connected to the inlet of the water tank (11). The first outlet of the first three-way solenoid valve (24) is connected to the drainage water circuit (60). The first outlet of the second three-way connector (23) is connected to the extraction water circuit (50).

6. The mechanical variable pressure water circuit structure of the coffee machine according to claim 5, characterized in that, The extraction water circuit (50) includes a heating pot (51), a water outlet solenoid valve (52), a flow regulating valve (53), a pressure gauge (54), and a fourth two-way solenoid valve (55). The water outlet solenoid valve (52) is a three-way solenoid valve. The first outlet of the second three-way connector (23) is connected to the water inlet of the heating pot (51). The first outlet of the heating pot (51) is connected to the water inlet of the water outlet solenoid valve (52). The second outlet of the water outlet solenoid valve (52) is connected to the drainage water circuit (60). The first outlet of the water outlet solenoid valve (52) is connected to the water inlet of the flow regulating valve (53). The water inlet of the flow regulating valve (53) is also connected to the pressure gauge (54). The outlet of the flow regulating valve (53) is connected to the brewing water outlet of the heating pot (51). The second outlet of the heating pot (51) is connected to the hot water outlet through the fourth two-way solenoid valve (55).

7. The mechanical variable pressure water circuit structure of the coffee machine according to claim 6, characterized in that, The drainage water passage (60) includes a third three-way connector (61) and a drain nozzle (62). The drain nozzle (62) has a three-inlet and one-outlet structure. The second outlet of the first protection valve (32) is connected to the first inlet of the third three-way connector (61). The second inlet of the third three-way connector (61) is connected to the steam water passage (40). The outlet of the third three-way connector (61) is connected to the first inlet of the drain nozzle (62). The second inlet of the drain nozzle (62) is connected to the second outlet of the water outlet solenoid valve (52). The third inlet of the drain nozzle (62) is connected to the first outlet of the first three-way solenoid valve (24).

8. The mechanical variable pressure water circuit structure of the coffee machine according to claim 7, characterized in that, The steam water circuit (40) includes a steam boiler (41), a second protective valve (42), an exhaust valve (43), and a fifth two-way solenoid valve (44). The inlet of the steam boiler (41) is connected to the outlet of the second two-way solenoid valve (33). The steam boiler (41) is connected to the second inlet of the third three-way connector (61) through the second protective valve (42). The steam boiler (41) is connected to the outside atmosphere through the exhaust valve (43). The steam boiler (41) is connected to the steam outlet through the fifth two-way solenoid valve (44).

9. A coffee machine, characterized in that, Includes the mechanically variable pressure water circuit structure as described in any one of claims 1-8 above.

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