Coffee machine waterway system

Abstract

The utility model relates to a coffee machine water system, including the preheating device for heating water, the first heating device for heating water, the second heating device for heating water, first check valve, second check valve, second electromagnetic valve, fourth electromagnetic valve, fifth electromagnetic valve, first electromagnetic valve and control circuit board, the preheating device includes first hot water pipe and second hot water pipe, the entrance of first hot water pipe connects outside water source, and the export of first hot water pipe is connected with the entrance of first check valve and the export of second check valve respectively, this coffee machine water system passes through the reasonable cooperation of preheating device, first heating device and second heating device, can realize the grading heating and the collaborative heating, not only can carry out the fast preheating to the cold water before entering water heating chamber, and the time that water reaches the temperature required for brewing or making steam is greatly shortened, but also can realize the separate heating or multiple heating device simultaneous work according to the demand, improves heating efficiency and water temperature stability.

Description

Technical Field

[0001] This utility model relates to the water system of a coffee machine. Background Technology

[0002] Coffee machines, as common small beverage preparation devices, typically need to heat cold water to a suitable temperature to meet the needs of brewing coffee powder, extracting coffee liquid, or providing steam for frothing milk. Most existing coffee machines use a single heating element or a few heating elements in series to heat the water; their heating efficiency and water temperature control precision largely determine the quality of the coffee produced and the user experience.

[0003] In traditional technical solutions, the common heating structures in coffee machines mainly fall into the following categories: Single heating element or heating block: Water is heated through a single heating chamber or heating element. This method has a simple structure, but the heating speed is slow and it cannot provide stable hot water or steam in a short time. Especially when a large flow or continuous water output is required, it is prone to problems such as insufficient temperature or large water temperature fluctuations.

[0004] Series heating: Some coffee machines use multi-stage series heating, for example, the water is first heated in a preheating chamber and then further heated in the main heating chamber. Although this method can improve the heating speed to some extent, the overall efficiency is still difficult to meet the demand for fast and stable water output due to the long heating path, complex water flow control, and energy loss between different heating units.

[0005] In existing technologies, the configuration of solenoid valves and check valves is relatively simple, and they are usually only used for water flow control in a single path. It is difficult to achieve flexible switching between multiple heating devices, which leads to problems such as inconvenient control, slow response and low energy utilization when coffee machines perform multiple functions such as "rapid preheating - continuous heating - steam supply". Utility Model Content

[0006] The primary objective of this invention is to provide a coffee machine water system that enables rapid preheating, rapid heating, and coordinated operation of multiple heating units, and achieves flexible control of the water circuit through a reasonable configuration of solenoid valves and check valves.

[0007] The purpose of this utility model is achieved as follows: A coffee machine water circuit system includes a preheating device for heating water, a first heating device for heating water, a second heating device for heating water, a first one-way valve, a second one-way valve, a second solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a first solenoid valve, and a control circuit board. The preheating device includes a first hot water pipe and a second hot water pipe. The inlet of the first hot water pipe is connected to an external water source, and the outlet of the first hot water pipe is connected to the inlet of the first one-way valve and the outlet of the second one-way valve, respectively. The inlet of the second hot water pipe is connected to an external water source, the outlet of the second hot water pipe is connected to the inlet of the third hot water pipe, the outlet of the third hot water pipe is connected to the first port of the second solenoid valve, and the second port of the second solenoid valve forms a steam port. The first heating device includes a third hot water pipe and a fourth hot water pipe. The outlet of the first one-way valve is connected to the inlet of the fourth hot water pipe and the second port of the fourth solenoid valve, respectively. The outlet of the fourth hot water pipe is connected to the first port of the fifth solenoid valve, and the second port of the fifth solenoid valve is connected to the first opening of the second heating device. The first port of the fourth solenoid valve is connected to the second opening of the second heating device, and the third port of the fourth solenoid valve is connected to the inlet of the second check valve. The second heating device is provided with a water heating chamber, the first opening and the second opening are connected to the water heating chamber, the first port of the first solenoid valve is connected to the water heating chamber, and the second port of the first solenoid valve forms a first hot water outlet; The preheating device, the first heating device, the second heating device, the second solenoid valve, the fourth solenoid valve, the fifth solenoid valve, and the first solenoid valve are all electrically connected to the control circuit board.

[0008] This coffee machine's water circuit system, through the rational coordination of a preheating device, a first heating device, and a second heating device, can achieve staged heating and synergistic heating. It can not only rapidly preheat cold water before it enters the water heating chamber, significantly shortening the time it takes for the water to reach the temperature required for brewing or steam generation, but also allows for individual heating or simultaneous operation of multiple heating devices as needed, improving heating efficiency and water temperature stability. Through the combined control of multiple sets of solenoid valves and one-way valves, it achieves flexible switching of the water circuit and automatic pressure relief function, ensuring rapid output of hot water and steam while improving the safety and reliability of the system, thereby improving the overall performance of the coffee machine and the user experience.

[0009] The objective of this utility model can also be achieved by the following technical measures: Furthermore, both the preheating device and the first heating device are instantaneous boilers, and the second heating device is a saturated water storage boiler.

[0010] The preheating device and the first heating device adopt an instantaneous boiler structure, which enables rapid heating of water as it flows through the instantaneous heating pipeline, with a fast response time, making it particularly suitable for quickly preparing hot water or steam in a short period of time. The second heating device adopts a saturated storage boiler, which can maintain a certain amount of water at a constant temperature, ensuring the heat supply for continuous extraction or long-term use. The combination of the two devices not only achieves rapid heating and continuous water supply performance, but also reduces waiting time, improving the overall heating efficiency and user experience.

[0011] Furthermore, it also includes a first water pump, a first backflow relief valve, a second water pump, a second backflow relief valve, a flow meter, and a three-way pipe. The flow meter is electrically connected to the control circuit board, and the first port of the three-way pipe is connected to an external water source. The second port of the three-way pipe is connected to the inlet of the flow meter, the outlet of the flow meter is connected to the inlet of the first water pump, the outlet of the first water pump is connected to the first port of the first backflow pressure relief valve, the second port of the first backflow pressure relief valve is connected to the inlet of the first hot water pipe, and the third port of the first backflow pressure relief valve is connected to the external environment to form a pressure relief port. The third port of the three-way pipe is connected to the inlet of the second water pump, the outlet of the second water pump is connected to the first port of the second backflow pressure relief valve, the second port of the second backflow pressure relief valve is connected to the inlet of the second hot water pipe, and the third port of the second backflow pressure relief valve is connected to the external environment to form a pressure relief port.

[0012] By introducing a first water pump, a second water pump, a backflow relief valve, a flow meter, and a tee pipe into the system, not only can independent control of different water inlet paths be achieved, but excess pressure can also be released through the backflow relief valve to protect the water pumps and pipelines. The flow meter configuration enables real-time monitoring of water volume and feedback to the control circuit board, thereby achieving precise control of water supply to meet the needs of different coffee recipes or hot water output. This structure significantly improves the system's stability, flexibility, and intelligence.

[0013] Furthermore, it also includes a sixth solenoid valve and a return water tank. The first port of the sixth solenoid valve is connected to the outlet of the first water pump, the second port of the sixth solenoid valve is connected to the first port of the first return pressure relief valve, the third port of the sixth solenoid valve is connected to the return water tank, and the sixth solenoid valve is electrically connected to the control circuit board.

[0014] By adding a sixth solenoid valve to the outlet of the first water pump and connecting it to the return water tank, its second port automatically closes when the solenoid valve is not energized. This effectively prevents high-temperature, high-pressure hot water from directly flowing back to the first water pump, avoiding accelerated aging of the first water pump due to prolonged contact with high-temperature liquid. Simultaneously, its first and third ports are naturally connected, allowing return water to flow into the return water tank, forming a circulation buffer, releasing pressure, and balancing the water circuit. For water pumps with an electromagnetic pump structure, this design also avoids the phenomenon of "not being able to pump water" caused by residual pressure or suction head issues, ensuring reliable pump start-up and stable water supply, significantly improving the system's durability and operational reliability.

[0015] Furthermore, it also includes a safety valve, the inlet of which is connected to the first port of the fifth solenoid valve, and the outlet of which is connected to the external environment to form a pressure relief port.

[0016] A safety valve is installed at the outlet of the fifth solenoid valve, which can automatically release excess pressure in abnormal situations to prevent excessive pressure caused by pipeline blockage or solenoid valve failure. This design not only protects the heating device and pipeline from the risk of bursting or leakage, but also further improves the stability and safety of the system, providing users with more reliable operational assurance.

[0017] Furthermore, the third port of the second solenoid valve is connected to the external environment to form a pressure relief port, and the third port of the first solenoid valve is also connected to the external environment to form a pressure relief port.

[0018] The beneficial effects of this utility model are as follows: This invention relates to a coffee machine water circuit system that, through the rational coordination of a preheating device, a first heating device, and a second heating device, achieves graded heating and synergistic heating. It not only rapidly preheats cold water before it enters the water heating chamber, significantly shortening the time it takes for the water to reach the temperature required for brewing or steam generation, but also allows for individual heating or simultaneous operation of multiple heating devices as needed, improving heating efficiency and water temperature stability. Through the combined control of multiple sets of solenoid valves and one-way valves, it achieves flexible switching of the water circuit and automatic pressure relief, ensuring rapid output of hot water and steam while enhancing system safety and reliability, thereby improving the overall performance of the coffee machine and the user experience.

[0019] This invention features a safety valve at the outlet of the fifth solenoid valve, which automatically releases excess pressure in abnormal situations, preventing excessive pressure caused by pipeline blockage or solenoid valve malfunction. This design not only protects the heating device and pipelines, avoiding the risk of bursting or leakage, but also further enhances the system's stability and operational safety, providing users with more reliable operational assurance.

[0020] This invention adds a sixth solenoid valve to the outlet of the first water pump and connects it to the return water tank. When the solenoid valve is not energized, its second port automatically closes, effectively preventing high-temperature, high-pressure hot water from directly flowing back to the first water pump and avoiding accelerated aging of the first water pump due to prolonged contact with high-temperature liquid. Simultaneously, its first and third ports are naturally connected, allowing return water to flow into the return water tank, forming a circulation buffer, releasing pressure, and balancing the water circuit. For water pumps with an electromagnetic pump structure, this design also avoids the phenomenon of "not being able to pump water" caused by residual pressure or suction head issues, ensuring reliable pump start-up and stable water supply, and significantly improving the system's durability and operational reliability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the preheating mode of the coffee machine's water circuit system (excluding the sixth solenoid valve and safety valve).

[0022] Figure 2This is a schematic diagram of the cold preheating mode of the coffee machine's water circuit system (excluding the sixth solenoid valve and safety valve).

[0023] Figure 3 This is a schematic diagram of the constant temperature mode of the water circuit system of a coffee machine (excluding the sixth solenoid valve and safety valve).

[0024] Figure 4 This is a schematic diagram of the water system of a coffee machine.

[0025] Figure 5 This is a schematic diagram of the coffee machine's water system (the state of the hot water discharged from the first hot water outlet and the state of the steam discharged from the steam outlet).

[0026] Figure 6 This is a schematic diagram of the coffee machine's water system (the instantaneous pressure release state of hot water stopping at the first hot water outlet and steam stopping at the steam outlet). Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments: Implementation examples, in conjunction with Figures 1 to 6 As shown, a coffee machine water circuit system includes a preheating device 1 for heating water, a first heating device 2 for heating water, a second heating device 3 for heating water, a first one-way valve 4, a second one-way valve 5, a second solenoid valve 20, a fourth solenoid valve 40, a fifth solenoid valve 50, a first solenoid valve 10, and a control circuit board. The preheating device 1 includes a first hot water pipe 11 and a second hot water pipe 12. The first heating device 2 includes a third hot water pipe 21 and a fourth hot water pipe 22. The inlet of the first hot water pipe 11 is connected to an external water source, and the outlet of the first hot water pipe 11 is connected to the inlet of the first one-way valve 4 and the outlet of the second one-way valve 5, respectively. The inlet of the second hot water pipe 12 is connected to an external water source, the outlet of the second hot water pipe 12 is connected to the inlet of the third hot water pipe 21, the outlet of the third hot water pipe 21 is connected to the first port of the second solenoid valve 20, the second port of the second solenoid valve 20 forms a steam port 300, the steam port 300 is connected to a steam pipe 301, and the third port of the second solenoid valve 20 is connected to the external environment to form a pressure relief port. The outlet of the first one-way valve 4 is connected to the inlet of the fourth hot water pipe 22 and the second port of the fourth solenoid valve 40, respectively. The outlet of the fourth hot water pipe 22 is connected to the first port of the fifth solenoid valve 50, and the second port of the fifth solenoid valve 50 is connected to the first opening of the second heating device 3. The first port of the fourth solenoid valve 40 is connected to the second opening of the second heating device 3, and the third port of the fourth solenoid valve 40 is connected to the inlet of the second one-way valve 5. The second heating device 3 is provided with a water heating chamber 31. The first opening and the second opening are connected to the water heating chamber 31. The first port of the first solenoid valve 10 is connected to the water heating chamber 31. The second port of the first solenoid valve 10 forms a first hot water outlet 100. The first hot water outlet 100 is connected to a coffee brewing head 101. The third port of the first solenoid valve 10 is connected to the external environment to form a pressure relief port. The preheating device 1, the first heating device 2, the second heating device 3, the second solenoid valve 20, the fourth solenoid valve 40, the fifth solenoid valve 50, and the first solenoid valve 10 are electrically connected to the control circuit board.

[0028] Furthermore, it also includes a third solenoid valve 30, the second port of the fourth solenoid valve 40 is connected to the inlet of the third solenoid valve 30 and the outlet of the second heating device 3 respectively, the outlet of the third solenoid valve 30 forms a second hot water outlet 200, the second hot water outlet 200 is connected to a hot water pipe 201, and the third solenoid valve 30 is electrically connected to the control circuit board.

[0029] Furthermore, both the preheating device 1 and the first heating device 2 are instantaneous boilers, and the second heating device 3 is a saturated water storage boiler.

[0030] Furthermore, it also includes a first water pump 6, a first backflow relief valve 7, a second water pump 8, a second backflow relief valve 9, a flow meter 91, and a three-way pipe 92. The flow meter 91 is electrically connected to the control circuit board, and the first port of the three-way pipe 92 is connected to an external water source. The second port of the three-way pipe 92 is connected to the inlet of the flow meter 91, the outlet of the flow meter 91 is connected to the inlet of the first water pump 6, the outlet of the first water pump 6 is connected to the first port of the first backflow pressure relief valve 7, the second port of the first backflow pressure relief valve 7 is connected to the inlet of the first hot water pipe 11, and the third port of the first backflow pressure relief valve 7 is connected to the external environment to form a pressure relief port. The third port of the three-way pipe 92 is connected to the inlet of the second water pump 8, the outlet of the second water pump 8 is connected to the first port of the second return pressure relief valve 9, the second port of the second return pressure relief valve 9 is connected to the inlet of the second hot water pipe 12, and the third port of the second return pressure relief valve 9 is connected to the external environment to form a pressure relief port.

[0031] Furthermore, it also includes a sixth solenoid valve 60 and a return water tank. The first port of the sixth solenoid valve 60 is connected to the outlet of the first water pump 6, the second port of the sixth solenoid valve 60 is connected to the first port of the first return pressure relief valve 7, the third port of the sixth solenoid valve 60 is connected to the return water tank, and the sixth solenoid valve 60 is electrically connected to the control circuit board.

[0032] Furthermore, it also includes a safety valve 70, the inlet of which is connected to the first port of the fifth solenoid valve 50, and the outlet of the safety valve 70 is connected to the external environment to form a pressure relief port.

[0033] Furthermore, the preheating device 1 also includes a first temperature sensing element and a first heating element. The first heating element is in close contact with the first hot water pipe 11 and the second hot water pipe 12. The heat from the first heating element is transferred to the first hot water pipe 11 and the second hot water pipe 12 to heat the first hot water pipe 11 and the second hot water pipe 12. The first temperature sensing element is in contact with the first hot water pipe 11 and the second hot water pipe 12. The first temperature sensing element is electrically connected to the control circuit board. The first temperature sensing element feeds back the water temperature data of the first hot water pipe 11 and the second hot water pipe 12 to the control circuit board. The first heating device 2 further includes a second temperature sensing element and a second heating element. The second heating element is in close contact with the third hot water pipe 21 and the fourth hot water pipe 22. The heat from the second heating element is transferred to the third hot water pipe 21 and the fourth hot water pipe 22 to heat them. The second temperature sensing element is in contact with the third hot water pipe 21 and the fourth hot water pipe 22. The second temperature sensing element is electrically connected to the control circuit board. The second temperature sensing element feeds back the water temperature data of the third hot water pipe 21 and the fourth hot water pipe 22 to the control circuit board.

[0034] Furthermore, the second heating device 3 also includes a third heating element. The water heating chamber 31 is equipped with a water level detection device and a water temperature detection device. The third heating element is in contact with the water heating chamber 31, and the heat from the third heating element is transferred to the water heating chamber 31. The water level detection device and the water temperature detection device are electrically connected to the control circuit board, respectively.

[0035] An automatic mode switching method includes the following steps: Step 1: The water level detection device detects the real-time water level of the water heating chamber 31 and sends feedback on whether there is a water shortage to the control circuit board. The control circuit board compares the real-time water level with the preset water level. The water temperature detection device detects the real-time water temperature of the water heating chamber 31 and sends feedback to the control circuit board. The control circuit board compares the real-time water temperature with the preset water temperature. When the water heating chamber 31 is short of water and the real-time water temperature cannot be obtained, the control circuit board enters the power-on preheating mode and executes Step 2. When the real-time water level is lower than the preset water level and the real-time water temperature is lower than the preset water temperature, the control circuit board enters the cold preheating mode and executes step three; When the real-time water level is higher than the preset water level and the real-time water temperature is higher than the preset water temperature, the control circuit board enters the constant temperature mode and executes step four. Step 2: In the preheating mode, the control circuit board energizes the fifth solenoid valve 50, connecting its first and second ports, and simultaneously starts the preheating device 1 and the first heating device 2. Room temperature water is heated sequentially through the first hot water pipe 11, then through the first one-way valve 4 into the fourth hot water pipe 22, and finally through the fifth solenoid valve 50 into the water heating chamber 31 of the second heating device 3. When the water level in the water heating chamber 31 reaches the preset level, the control circuit board starts the second heating device 3 for further heating. At this time, the hot water in the water heating chamber 31 returns to the inlet of the first one-way valve 4 through the first and third ports of the fourth solenoid valve 40 and the second one-way valve 5, forming a circulating heating cycle. The preheating device 1, the first heating device 2, and the second heating device 3 work together to improve overall heating efficiency. Step 3: In the cold preheating mode, the control circuit board energizes the fifth solenoid valve 50, connecting its first and second ports, and energizes the fourth solenoid valve 40, connecting its first and second ports and closing its third port. Simultaneously, it activates the first heating device 2 and the second heating device 3. At this time, the hot water in the water heating chamber 31 enters the fourth hot water pipe 22 through the first and second ports of the fourth solenoid valve 40 for heating, and then returns to the water heating chamber 31 through the second and first ports of the fifth solenoid valve 50 for circulating heating until the water temperature detection device detects that the water temperature in the water heating chamber 31 has reached or exceeded the preset water temperature. Then, the control circuit board closes the fourth solenoid valve 40 and the fifth solenoid valve 50 and enters the constant temperature mode. Step 4: In constant temperature mode, the control circuit board controls the fourth solenoid valve 40 and the fifth solenoid valve 50 to be de-energized. The hot water in the water heating chamber 31 flows into the third hot water pipe 21 through the first and third ports of the fourth solenoid valve 40 and the second one-way valve 5 to circulate, thereby achieving constant temperature insulation.

[0036] When you need to use the hot water discharged from the first hot water outlet 100 to brew coffee: The control circuit board energizes the sixth solenoid valve 60, the fourth solenoid valve 40, the first solenoid valve 10, and the first water pump 6. The first water pump 6 draws ambient temperature water through the sixth solenoid valve 60 into the first hot water pipe 11 of the preheating device 1 for heating. The water then passes sequentially through the first one-way valve 4, the second port of the fourth solenoid valve 40, and the first port into the water heating chamber 31 of the second heating device 3 for further heating. The heated water is then transported along the second port of the first solenoid valve 10 to the coffee brewing head 101 via the first hot water outlet 100, thus achieving the brewing function. When the user stops using the device, the first solenoid valve 10 is de-energized, and its first and third ports are connected, automatically releasing the pressure within the system to the outside, ensuring water circuit safety.

[0037] When it is necessary to use the steam discharged from the steam outlet: The control circuit board energizes the second water pump 8 and the second solenoid valve 20. The second water pump 8 delivers ambient temperature water to the second hot water pipe 12 of the preheating device 1 for heating, and then the water enters the third hot water pipe 21 of the first heating device 2 to generate steam. The generated steam is discharged from the steam port 300 through the second port of the second solenoid valve 20 and enters the steam pipe 301, thus supplying steam. When the user stops using the system, the second solenoid valve 20 is de-energized, and its second port connects to the third port, automatically discharging excess steam to the outside to prevent residual high-pressure steam in the system.

[0038] When hot water discharged from the second hot water outlet 200 is needed: The control circuit board energizes the sixth solenoid valve 60, the fourth solenoid valve 40, the third solenoid valve 30, and the first water pump 6. The first water pump 6 draws ambient temperature water through the sixth solenoid valve 60 into the first hot water pipe 11 of the preheating device 1 for heating. The water then sequentially passes through the first one-way valve 4, the second port of the fourth solenoid valve 40, and the first port into the third solenoid valve 30. The heated water is finally discharged from the second hot water outlet 200 through the hot water pipe, achieving an independent hot water supply.

[0039] Automatic switching process of the coffee machine's water system: When a user starts the coffee machine with this water circuit system for the first time, the water level detection device detects that the water heating chamber 31 is in a water shortage state, and at the same time the water temperature detection device cannot obtain real-time water temperature data. The control circuit board automatically determines to enter the start-up preheating mode.

[0040] At this time, room temperature water (about 25°C) enters the first hot water pipe 11 of the preheating device 1 through the sixth solenoid valve 60 under the action of the first water pump 6. After being heated to about 50°C, it enters the fourth hot water pipe 22 of the first heating device 2 through the first one-way valve 4 and continues to be heated to about 75°C. Then it enters the water heating chamber 31 of the second heating device 3 through the fifth solenoid valve 50. When the water level detection device reports that the water level in the water heating chamber 31 of the second heating device 3 has reached a preset value (e.g., 250 mL), the control circuit board starts the third heating element of the second heating device 3 to heat the water in the water heating chamber 31.

[0041] When the water level detection device reports that the water level in the water heating chamber 31 of the second heating device 3 has reached a preset value (e.g., 250mL), and the water temperature detection device reports that the water temperature in the water heating chamber 31 of the second heating device 3 has not reached a preset value (e.g., 90°), the control circuit board automatically determines to enter the cold preheating mode.

[0042] The control circuit board energizes the fifth solenoid valve 50, connecting its first and second ports, and energizes the fourth solenoid valve 40, connecting its first and second ports and closing its third port. Simultaneously, it activates the first heating device 2 and the second heating device 3. At this time, the hot water in the water heating chamber 31 enters the fourth hot water pipe 22 through the first and second ports of the fourth solenoid valve 40 for heating, and then returns to the water heating chamber 31 through the second and first ports of the fifth solenoid valve 50. Utilizing the thermosiphon circulation principle, the water is circulated and heated until the water temperature detection device detects that the water temperature in the water heating chamber 31 has reached or exceeded the preset water temperature (e.g., the water temperature is stably maintained between 92 and 95°C). Then, the control circuit board closes the fourth solenoid valve 40 and the fifth solenoid valve 50 and enters a constant temperature mode, thus completing the initial heating process and ensuring that the user receives constant hot water for brewing coffee on the first use.

Claims

1. A water circuit system for a coffee machine, comprising a preheating device, a first heating device, a second heating device, a first one-way valve, a second one-way valve, a second solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a first solenoid valve, and a control circuit board, characterized in that: The preheating device includes a first hot water pipe for heating water and a second hot water pipe for heating water. The inlet of the first hot water pipe is connected to an external water source, and the outlet of the first hot water pipe is connected to the inlet of a first check valve and the outlet of a second check valve, respectively. The inlet of the second hot water pipe is connected to an external water source, the outlet of the second hot water pipe is connected to the inlet of the third hot water pipe, the outlet of the third hot water pipe is connected to the first port of the second solenoid valve, and the second port of the second solenoid valve forms a steam port. The first heating device includes a third hot water pipe for heating water and a fourth hot water pipe for heating water. The outlet of the first one-way valve is connected to the inlet of the fourth hot water pipe and the second port of the fourth solenoid valve, respectively. The outlet of the fourth hot water pipe is connected to the first port of the fifth solenoid valve, and the second port of the fifth solenoid valve is connected to the first opening of the second heating device. The first port of the fourth solenoid valve is connected to the second opening of the second heating device, and the third port of the fourth solenoid valve is connected to the inlet of the second check valve. The second heating device is provided with a water heating chamber for heating water. The first opening and the second opening are connected to the water heating chamber. The first port of the first solenoid valve is connected to the water heating chamber, and the second port of the first solenoid valve forms a first hot water outlet. The preheating device, the first heating device, the second heating device, the second solenoid valve, the fourth solenoid valve, the fifth solenoid valve, and the first solenoid valve are all electrically connected to the control circuit board.

2. The coffee machine water system according to claim 1, characterized in that: Both the preheating device and the first heating device are instantaneous boilers, and the second heating device is a saturated water storage boiler.

3. The coffee machine water system according to claim 1, characterized in that: It also includes a first water pump, a first backflow relief valve, a second water pump, a second backflow relief valve, a flow meter, and a three-way pipe. The flow meter is electrically connected to the control circuit board, and the first port of the three-way pipe is connected to an external water source. The second port of the three-way pipe is connected to the inlet of the flow meter, the outlet of the flow meter is connected to the inlet of the first water pump, the outlet of the first water pump is connected to the first port of the first backflow pressure relief valve, the second port of the first backflow pressure relief valve is connected to the inlet of the first hot water pipe, and the third port of the first backflow pressure relief valve is connected to the external environment to form a pressure relief port. The third port of the three-way pipe is connected to the inlet of the second water pump, the outlet of the second water pump is connected to the first port of the second backflow pressure relief valve, the second port of the second backflow pressure relief valve is connected to the inlet of the second hot water pipe, and the third port of the second backflow pressure relief valve is connected to the external environment to form a pressure relief port.

4. The coffee machine water system according to claim 3, characterized in that: It also includes a sixth solenoid valve and a return water tank. The first port of the sixth solenoid valve is connected to the outlet of the first water pump, the second port of the sixth solenoid valve is connected to the first port of the first return pressure relief valve, the third port of the sixth solenoid valve is connected to the return water tank, and the sixth solenoid valve is electrically connected to the control circuit board.

5. The coffee machine water system according to claim 1, characterized in that: It also includes a safety valve, the inlet of which is connected to the first port of the fifth solenoid valve, and the outlet of which is connected to the external environment to form a pressure relief port.

6. The coffee machine water system according to claim 1, characterized in that: The third port of the second solenoid valve is connected to the external environment to form a pressure relief port, and the third port of the first solenoid valve is also connected to the external environment to form a pressure relief port.

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