Steam generating device and coffee machine water treatment device

Abstract

The utility model relates to steam generating device and coffee machine water treatment device, including the first heating device for heating water, second electromagnetic valve and the second heating device for steam to hot water heating, the outlet of first heating device is connected with the inlet of second electromagnetic valve, the outlet of second electromagnetic valve is connected with the inlet of second heating device, second heating device is provided with steam outlet, second electromagnetic valve controls whether hot water enters second heating device, the device sets up second electromagnetic valve at second heating device inlet, high temperature and high pressure steam generates and does not need to discharge through second electromagnetic valve, avoids the repeated heat impact and condensation cycle of steam to valve body sealing element, coil and spring, has prolonged the service life of second electromagnetic valve significantly, because hot water must first enter second heating device through second electromagnetic valve, then generates the steam of higher dryness degree by second heating device and directly discharges, thereby has promoted steam quality and steam stability.

Description

Technical Field

[0001] This utility model relates to a steam generating device and a water treatment device for a coffee machine. Background Technology

[0002] In existing steam generating devices, water is heated by a first heating device to form hot water, which then flows into a second heating device to form steam. The steam is discharged through a steam pipe, where a solenoid valve controls whether the steam is discharged. In the steam output path, high-temperature, high-pressure steam must first pass through the second solenoid valve before it can be discharged. Long-term, repeated high-temperature impacts, thermal expansion, and condensation cycles will accelerate the aging of internal components such as seals, coils, and springs of the solenoid valve, significantly shortening its service life.

[0003] Furthermore, existing home or commercial coffee machines typically employ the following water and heating system: an internal water tank stores water to be heated; a water pump draws room-temperature water from the tank to a first heating element for heating, producing hot water at approximately 90-95°C; the hot water is then split via a three-way valve, flowing either through a first solenoid valve into the coffee brewing head for extraction, or directly to a second heating element with a steam outlet, where it is reheated to high-temperature, high-pressure steam for frothing milk or cleaning pipes. Finally, the steam is expelled from the machine through a second solenoid valve.

[0004] However, this design has the following shortcomings:

[0005] In the steam output path, high-temperature, high-pressure steam must first pass through the second solenoid valve before it can be discharged. Long-term, repeated high-temperature impacts and thermal expansion and condensation cycles will accelerate the aging of internal components such as seals, coils, and springs of the solenoid valve, significantly shortening its service life.

[0006] Because high-temperature and high-pressure steam must first pass through the second solenoid valve before it can be discharged, the hot water remaining in the pipeline cannot be completely drained after each use. When the steam is turned on again, the steam must flush out these residual waters, resulting in an increase in the initial steam water content and a decline in the consumer experience. At the same time, the interaction between water and steam will also generate additional thermal stress and corrosion risks on the inner wall of the pipeline and the seals.

[0007] Due to the accelerated wear and tear on solenoid valves and pipeline components caused by high-temperature steam, the equipment requires more frequent maintenance and replacement of key components, increasing maintenance costs and affecting the product's economic viability and market competitiveness. Utility Model Content

[0008] The primary objective of this invention is to provide a steam generator that extends the service life of the second solenoid valve and improves the dryness and quality of the steam output.

[0009] The second objective of this invention is to provide a coffee machine water treatment device that extends the service life of the second solenoid valve and improves the dryness and quality of the steam output.

[0010] The third objective of this invention is to provide a coffee machine water treatment device with independent hot water output, independent steam output, a long service life of the second solenoid valve, and improved steam output dryness and quality.

[0011] The primary objective of this invention is achieved as follows:

[0012] A steam generating device includes a first heating device for heating water, a second solenoid valve, and a second heating device for heating hot water into steam. The outlet of the first heating device is connected to the inlet of the second solenoid valve, and the outlet of the second solenoid valve is connected to the inlet of the second heating device. The second heating device is provided with a steam outlet, and the second solenoid valve controls whether hot water enters the second heating device.

[0013] This device places the second solenoid valve at the inlet of the second heating device. After the high-temperature and high-pressure steam is generated, it does not need to be discharged through the second solenoid valve, thus avoiding repeated thermal shock and condensation cycles of steam on the valve body seals, coils and springs, and significantly extending the service life of the second solenoid valve.

[0014] Because the hot water must first pass through the second solenoid valve into the second heating device, and then the second heating device generates steam with higher dryness and discharges it directly, the steam quality and steam output stability are improved.

[0015] After steam output is completed, residual moisture can be automatically drained to prevent the initial steam moisture content from increasing during the next use, thus maintaining a continuous dry steam output, improving the consumer experience and reducing steam quality fluctuations caused by excessive initial moisture content.

[0016] The primary objective of this utility model can also be achieved by the following technical measures:

[0017] Furthermore, the first heating device includes a furnace body, a heating element, and a water pipe. The furnace body has a water heating chamber. The heating element and the water pipe are disposed inside the furnace body and located outside the water heating chamber. The heat generated by the heating element is transferred to the water heating chamber and the water pipe.

[0018] The inlet of the water pipe is connected to the outlet of the first water pump, the outlet of the water pipe is connected to the inlet of the water heating chamber, and the outlet of the water heating chamber forms a hot water outlet.

[0019] By arranging the heating element and water pipe outside the heating chamber, the small volume of the water pipe is used to quickly preheat the incoming water, and then the preheated water is introduced into the large-volume heating chamber for main heating. This achieves the synergistic effect of secondary heat exchange, significantly shortens the initial water preheating time, and improves the heating rate and overall energy efficiency.

[0020] During the preheating stage, due to the limited water volume in the water pipe, the heating element can concentrate the heat to the water in the water pipe in a short time. During the main heating stage, deep heating is completed in the heating chamber.

[0021] The water temperature is raised to an intermediate level during the preheating stage, which significantly shortens the time required for the heating chamber to reach the set temperature. Users can obtain a stable hot water output more quickly when they turn on the hot water or steam demand, thus improving the user experience.

[0022] This design uses only one heating element to perform both preheating and main heating functions, eliminating the need for additional heating elements. The overall structure is compact, reducing manufacturing and installation costs and facilitating widespread application.

[0023] Furthermore, the outlet of the water pipe forms a preheated hot water outlet, the inlet of the water heating chamber forms a preheated hot water inlet, and the preheated hot water outlet and the preheated hot water inlet are connected by a pipe.

[0024] By setting up an independent preheating hot water circuit between the water pipe outlet and the heating chamber inlet, not only is the flow path of preheating and main heating separated, but the water flow in the heating chamber is also more uniform.

[0025] Furthermore, the furnace body has a water heating chamber at its center, and a heat-conducting channel surrounds the water heating chamber. The heating element and water pipe are placed inside the heat-conducting channel, and the conductive end of the heating element, the inlet of the water pipe, and the outlet of the water pipe are exposed outside the heat-conducting channel.

[0026] The heating chamber is placed in the center of the furnace body, and a surrounding heat conduction channel is opened around it, so that the heating tube and water pipe tightly surround the heating chamber, which increases the heat transfer area from the heating tube to the water heating chamber and water pipe, and improves the heat exchange efficiency; at the same time, the heat conduction channel structure helps the furnace body to be heated evenly as a whole, reducing the risk of local overheating.

[0027] Furthermore, the heating element and the water pipe are intertwined, and the heating element is in close contact with the inner wall of the heat conduction channel.

[0028] The heating element and water pipe are intertwined, and the heating element is close to the inner wall of the heat conduction channel, which shortens the heat transfer path from the heating element to the water pipe, making the preheating speed faster and further improving the heating response of convective water with small flow rates.

[0029] The second objective of this utility model is achieved as follows:

[0030] A coffee machine water treatment device includes a water tank, a first water pump, a three-way valve, a first solenoid valve, and a coffee brewing head. The inlet of the first water pump is connected to the outlet of the water tank, and the outlet of the first water pump is connected to the inlet of the first heating device of the steam generator.

[0031] The three-way valve is installed on the pipeline between the first heating device and the second solenoid valve. The first port of the three-way valve is connected to the outlet of the first heating device, and the second port of the three-way valve is connected to the inlet of the second solenoid valve.

[0032] The third port of the three-way valve is connected to the inlet of the first solenoid valve, and the outlet of the first solenoid valve is connected to the coffee brewing head to form a hot water channel. The first solenoid valve controls whether hot water enters the coffee brewing head.

[0033] This device places the second solenoid valve at the inlet of the second heating device. After the high-temperature and high-pressure steam is generated, it does not need to be discharged through the second solenoid valve, thus avoiding repeated thermal shock and condensation cycles of steam on the valve body seals, coils and springs, and significantly extending the service life of the second solenoid valve.

[0034] Because the hot water must first enter the second heating device through the second solenoid valve, and then the second heating device generates steam with higher dryness and discharges it directly, the steam passage and the hot water passage are strictly separated, avoiding direct contact between the steam and the hot water in the three-way valve, thereby improving the steam quality and steam output stability.

[0035] The water treatment device at the end of the coffee machine can automatically drain residual water after steam output ends, preventing the initial steam moisture content from increasing during the next use, maintaining a continuous dry steam output, improving the consumer experience and reducing steam quality fluctuations caused by excessive initial moisture content.

[0036] The second objective of this utility model can also be achieved by the following technical measures:

[0037] Furthermore, it also includes a flow meter, one end of which is connected to the outlet of the water tank, and the other end of which is connected to the inlet of the first water pump;

[0038] It also includes a safety relief valve, the inlet of which is connected to the outlet of the first water pump, the outlet of which is connected to the inlet of the first heating device, and the relief port of which is connected to the outlet of the water tank.

[0039] It also includes a pressure relief pipe, wherein the pressure relief port of the first solenoid valve and the pressure relief port of the second solenoid valve are respectively connected to the inlet of the pressure relief pipe.

[0040] By adding a flow meter between the water tank outlet and the first water pump inlet, the water pump flow rate can be detected and fed back in real time, ensuring that the water intake is accurate and controllable for each brewing. When the flow rate is abnormal (too high or too low), the system alarm can be triggered in time or the water pump working status can be adjusted to avoid uneven extraction or pump cavitation caused by unstable water volume, thereby further improving the coffee extraction quality and equipment reliability.

[0041] The safety pressure relief valve is designed to automatically open when the outlet pressure of the first water pump is too high, returning the excess pressure to the water tank to prevent damage to the pipeline and heating device due to overpressure. At the same time, the pressure relief port returns to the water tank, ensuring stable system circulation and preventing external leakage from causing safety hazards to users, thus significantly improving the safety and service life of the whole machine.

[0042] By connecting the pressure relief ports of the first and second solenoid valves to a dedicated pressure relief pipeline, the residual pressure and liquid inside the valve can be safely guided and discharged during valve closing or switching. This not only prevents high pressure retention in the valve cavity from damaging the valve core and seals, but also avoids pulsating pressure shocks generated when the system switches between different working modes, thus improving the smoothness of the solenoid valve operation and the overall durability of the system.

[0043] The third objective of this utility model is achieved as follows:

[0044] A coffee machine water treatment device includes a water tank, a first water pump, a second water pump, a first solenoid valve, a coffee brewing head, and a third heating device. The inlet of the first water pump is connected to the outlet of the water tank, and the outlet of the first water pump is connected to the inlet of the first heating device of the steam generator.

[0045] The inlet of the second water pump is connected to the outlet of the water tank, the outlet of the second water pump is connected to the inlet of the third heating device, the outlet of the third heating device is connected to the inlet of the first solenoid valve, and the outlet of the first solenoid valve is connected to the coffee brewing head to form a hot water channel. The first solenoid valve controls whether hot water enters the coffee brewing head.

[0046] This device places the second solenoid valve at the inlet of the second heating device. After the high-temperature and high-pressure steam is generated, it does not need to be discharged through the second solenoid valve, thus avoiding repeated thermal shock and condensation cycles of steam on the valve body seals, coils and springs, and significantly extending the service life of the second solenoid valve.

[0047] Because the hot water must first enter the second heating device through the second solenoid valve, and then the second heating device generates steam with higher dryness and discharges it directly, the steam passage and the hot water passage are strictly separated, avoiding direct contact between the steam and the hot water in the three-way valve, thereby improving the steam quality and steam output stability.

[0048] The water treatment device at the end of the coffee machine can automatically drain residual water after steam output ends, preventing the initial steam moisture content from increasing during the next use, maintaining a continuous dry steam output, improving the consumer experience and reducing steam quality fluctuations caused by excessive initial moisture content.

[0049] The water in the tank is used to generate steam independently through the first water pump and the steam generator. The second solenoid valve controls whether the hot water enters the second heating device, thereby controlling whether steam is generated. The water in the tank is used to generate hot water through the second water pump, the third heating device, the first solenoid valve, and the coffee brewing head. The first solenoid valve controls whether the hot water enters the coffee brewing head. These processes are independent and do not affect each other.

[0050] The third objective of this utility model can also be achieved by the following technical measures:

[0051] Furthermore, it also includes a flow meter, one end of which is connected to the outlet of the water tank, and the other end of which is connected to the inlet of the second water pump;

[0052] It also includes a safety relief valve, the inlet of which is connected to the outlet of the second water pump, the outlet of which is connected to the inlet of the third heating device, and the relief port of which is connected to the outlet of the water tank.

[0053] The first solenoid valve has a first pressure relief pipe at its pressure relief port, and the second solenoid valve has a second pressure relief pipe at its pressure relief port.

[0054] By adding a flow meter between the water tank outlet and the second water pump inlet, the water pump flow rate can be detected and fed back in real time, ensuring that the water intake is accurate and controllable for each brewing. When the flow rate is abnormal (too high or too low), the system alarm can be triggered in time or the water pump working status can be adjusted to avoid uneven extraction or pump cavitation caused by unstable water volume, thereby further improving the coffee extraction quality and equipment reliability.

[0055] The safety pressure relief valve is designed to automatically open when the outlet pressure of the second water pump is too high, returning the excess pressure to the water tank to prevent damage to the pipeline and heating device due to overpressure. At the same time, the pressure relief port returns to the water tank, ensuring stable system circulation and preventing external leakage from causing safety hazards to users, thus significantly improving the safety and service life of the entire machine.

[0056] The first solenoid valve has a first pressure relief pipe at its pressure relief port, and the second solenoid valve has a second pressure relief pipe at its pressure relief port. This allows residual pressure and liquid inside the valve to be safely guided and discharged during valve closing or switching. This not only prevents high pressure retention in the valve cavity from damaging the valve core and seals, but also avoids pulsating pressure shocks generated when the system switches between different working modes, thus improving the smoothness of the solenoid valve's operation and the overall durability of the system.

[0057] The beneficial effects of this utility model are as follows:

[0058] In this invention, high-temperature steam no longer passes directly through the second solenoid valve, preventing the second solenoid valve from aging, deforming, or failing to seal due to long-term exposure to high-temperature and high-pressure steam, thus significantly extending the service life of the second solenoid valve.

[0059] In this invention, the second heating device only receives liquid hot water and generates steam. The steam passage is completely isolated from the hot water passage, preventing steam backflow or mixing with the hot water in the three-way pipe, thereby improving the purity and dryness of the steam.

[0060] This invention ensures that no unvaporized hot water remains in the pipeline after the second solenoid valve is closed, and the passage is naturally emptied when the steam output ends, effectively preventing the initial steam moisture content from being too high during the next use and improving the steam user experience. Attached Figure Description

[0061] Figure 1 This is a schematic diagram of a steam generator.

[0062] Figure 2 This is a schematic diagram of the coffee machine water treatment device in Example 1.

[0063] Figure 3 This is a schematic diagram of the first heating device.

[0064] Figure 4 This is a cross-sectional view of the first heating device.

[0065] Figure 5 This is a schematic diagram of the coffee machine water treatment device in Example 2. Detailed Implementation

[0066] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0067] Example 1, combined with Figures 1 to 4 As shown, a coffee machine water treatment device includes a water tank 1, a first water pump 2, a three-way valve 4, a first solenoid valve 5, a coffee brewing head 6, and a steam generator. The steam generator includes a first heating device 3 for heating water, a second solenoid valve 7, and a second heating device 8 for heating hot water into steam. The outlet of the first heating device 3 is connected to the inlet of the second solenoid valve 7, and the outlet of the second solenoid valve 7 is connected to the inlet of the second heating device 8. The second heating device 8 is provided with a steam outlet, and the second solenoid valve 7 controls whether hot water enters the second heating device 8.

[0068] The inlet of the first water pump 2 is connected to the outlet of the water tank 1, and the outlet of the first water pump 2 is connected to the inlet of the first heating device 3 of the steam generator. The three-way valve 4 is installed on the pipeline between the first heating device 3 and the second solenoid valve 7. The first port of the three-way valve 4 is connected to the outlet of the first heating device 3, and the second port of the three-way valve 4 is connected to the inlet of the second solenoid valve 7.

[0069] The third port of the three-way valve 4 is connected to the inlet of the first solenoid valve 5, and the outlet of the first solenoid valve 5 is connected to the coffee brewing head 6 to form a hot water channel. The first solenoid valve 5 controls whether hot water enters the coffee brewing head 6.

[0070] Furthermore, it also includes a flow meter 9, one end of which is connected to the outlet of the water tank 1, and the other end of which is connected to the inlet of the first water pump 2.

[0071] Furthermore, it also includes a safety pressure relief valve 10, the inlet of which is connected to the outlet of the first water pump 2, the outlet of which is connected to the inlet of the first heating device 3, and the pressure relief port of which is connected to the outlet of the water tank 1.

[0072] Furthermore, it also includes a pressure relief pipe 20, wherein the pressure relief port of the first solenoid valve 5 and the pressure relief port of the second solenoid valve 7 are respectively connected to the inlet of the pressure relief pipe 20.

[0073] In this device, the user can control whether hot water enters the coffee brewing head 6 through the first solenoid valve 5, thereby achieving precise control of the hot water for coffee extraction; at the same time, the user can control whether hot water enters the second heating device 8 through the second solenoid valve 7, in order to determine whether steam is generated and discharged, thereby achieving independent control of the steam function.

[0074] The first heating device 3 includes a furnace body 31, a heating element 32 and a water pipe 33. The furnace body 31 has a water heating chamber 34. The heating element 32 and the water pipe 33 are arranged inside the furnace body 31 and outside the water heating chamber 34. The heat generated by the heating element 32 is transferred to the water heating chamber 34 and the water pipe 33.

[0075] The inlet of the water pipe 33 is connected to the outlet of the first water pump 2, the outlet of the water pipe 33 is connected to the inlet of the water heating chamber 34, and the outlet of the water heating chamber 34 forms a hot water outlet 342.

[0076] Furthermore, the outlet of the water pipe 33 forms a preheated hot water outlet 331, and the inlet of the water heating chamber 34 forms a preheated hot water inlet 341. The preheated hot water outlet 331 and the preheated hot water inlet 341 are connected by a pipe.

[0077] Furthermore, the furnace body 31 has a water heating chamber 34 at its center, and the furnace body 31 has a heat conduction channel surrounding the water heating chamber 34. The heating tube 32 and the water pipe 33 are placed inside the heat conduction channel, and the conductive end 321 of the heating tube 32, the inlet of the water pipe 33, and the outlet of the water pipe 33 are exposed outside the heat conduction channel.

[0078] Furthermore, the heating element 32 and the water pipe 33 are intertwined, and the heating element 32 is in close contact with the inner wall of the heat conduction channel.

[0079] Furthermore, a heat-conducting plate 35 is provided between the heat-conducting channel and the water heating chamber 34.

[0080] Placing the second solenoid valve 7 at the front end of the second heating device 8 has the following significant advantages:

[0081] High-temperature steam no longer passes directly through the second solenoid valve 7, preventing the second solenoid valve 7 from aging, deforming, or failing to seal due to long-term exposure to high-temperature and high-pressure steam, thus significantly extending the service life of the second solenoid valve 7.

[0082] The second heating device 8 only receives liquid hot water and generates steam. The steam passage is completely isolated from the hot water passage to prevent steam backflow or mixing with the hot water in the three-way pipe, thereby improving the purity and dryness of the steam.

[0083] After the second solenoid valve 7 is closed, no unvaporized hot water will remain in the pipeline. When the steam output ends, the passage will be naturally emptied, effectively preventing the initial steam water content from being too high when using it next time, thus improving the steam user experience.

[0084] The principle behind this coffee machine's rapid steam generation:

[0085] The first water pump 2 draws cold water from the water tank 1 into the water pipe 33 located in the heat conduction channel. The water pipe 33 is closely attached to the inner wall of the heat conduction channel and is wrapped around the heating tube 32. The heating tube 32 preheats the water in the water pipe 33. The preheated water enters the water heating chamber 34 through the pipe for deep heating and quickly generates high-temperature hot water.

[0086] When the steam function is turned on, the three-way valve 4 guides the hot water to the second solenoid valve 7, and the hot water then enters the second heating device 8 for instantaneous vaporization, directly outputting high dryness steam. Since the incoming water has been preheated to near the boiling point, the second heating device 8 can complete the steam conversion process in a very short time, achieving rapid and continuous steam output.

[0087] Example 2, combined with Figure 5As shown, a coffee machine water treatment device includes a water tank 1, a first water pump 2, a second water pump 100, a first solenoid valve 5, a coffee brewing head 6, a third heating device 200, and a steam generator. The steam generator includes a first heating device 3 for heating water, a second solenoid valve 7, and a second heating device 8 for heating hot water into steam. The outlet of the first heating device 3 is connected to the inlet of the second solenoid valve 7, and the outlet of the second solenoid valve 7 is connected to the inlet of the second heating device 8. The second heating device 8 is provided with a steam outlet, and the second solenoid valve 7 controls whether hot water enters the second heating device 8.

[0088] The inlet of the first water pump 2 is connected to the outlet of the water tank 1, and the outlet of the first water pump 2 is connected to the inlet of the first heating device 3 of the steam generator.

[0089] The inlet of the second water pump 100 is connected to the outlet of the water tank 1, the outlet of the second water pump 100 is connected to the inlet of the third heating device 200, the outlet of the third heating device 200 is connected to the inlet of the first solenoid valve 5, and the outlet of the first solenoid valve 5 is connected to the coffee brewing head 6 to form a hot water channel. The first solenoid valve 5 controls whether hot water enters the coffee brewing head 6.

[0090] Furthermore, it also includes a flow meter 9, one end of which is connected to the outlet of the water tank 1, and the other end of which is connected to the inlet of the second water pump 100;

[0091] It also includes a safety pressure relief valve 10, the inlet of which is connected to the outlet of the second water pump 100, the outlet of which is connected to the inlet of the third heating device 200, and the pressure relief port of which is connected to the outlet of the water tank 1.

[0092] The first solenoid valve 5 has a first pressure relief pipe 300 at its pressure relief port, and the second solenoid valve 7 has a second pressure relief pipe 400 at its pressure relief port.

[0093] In this device, the user can control whether hot water enters the coffee brewing head 6 through the first solenoid valve 5, so as to achieve precise control of the hot water for coffee extraction; at the same time, the user can control whether hot water enters the second heating device 8 through the second solenoid valve 7, so as to determine whether to generate and discharge steam, so as to achieve independent supply of steam and hot water.

[0094] The first heating device 3 includes a furnace body 31, a heating element 32 and a water pipe 33. The furnace body 31 has a water heating chamber 34. The heating element 32 and the water pipe 33 are arranged inside the furnace body 31 and outside the water heating chamber 34. The heat generated by the heating element 32 is transferred to the water heating chamber 34 and the water pipe 33.

[0095] The inlet of the water pipe 33 is connected to the outlet of the first water pump 2, the outlet of the water pipe 33 is connected to the inlet of the water heating chamber 34, and the outlet of the water heating chamber 34 forms a hot water outlet 342.

[0096] Furthermore, the outlet of the water pipe 33 forms a preheated hot water outlet 331, and the inlet of the water heating chamber 34 forms a preheated hot water inlet 341. The preheated hot water outlet 331 and the preheated hot water inlet 341 are connected by a pipe.

[0097] Furthermore, the furnace body 31 has a water heating chamber 34 at its center, and the furnace body 31 has a heat conduction channel surrounding the water heating chamber 34. The heating tube 32 and the water pipe 33 are placed inside the heat conduction channel, and the conductive end 321 of the heating tube 32, the inlet of the water pipe 33, and the outlet of the water pipe 33 are exposed outside the heat conduction channel.

[0098] Furthermore, the heating element 32 and the water pipe 33 are intertwined, and the heating element 32 is in close contact with the inner wall of the heat conduction channel.

[0099] Furthermore, a heat-conducting plate 35 is provided between the heat-conducting channel and the water heating chamber 34.

Claims

1. A steam generating device, characterized in that: It includes a first heating device for heating water, a second solenoid valve, and a second heating device for heating hot water into steam. The outlet of the first heating device is connected to the inlet of the second solenoid valve, and the outlet of the second solenoid valve is connected to the inlet of the second heating device. The second heating device is provided with a steam outlet, and the second solenoid valve controls whether hot water enters the second heating device.

2. The steam generator according to claim 1, characterized in that: The first heating device includes a furnace body, a heating element, and a water pipe. The furnace body has a water heating chamber. The heating element and the water pipe are installed inside the furnace body and located outside the water heating chamber. The heat generated by the heating element is transferred to the water heating chamber and the water pipe. The inlet of the water pipe is connected to the outlet of the water pump, the outlet of the water pipe is connected to the inlet of the water heating chamber, and the outlet of the water heating chamber forms a hot water outlet.

3. The steam generating device according to claim 2, characterized in that: The outlet of the water pipe forms a preheated hot water outlet, and the inlet of the water heating chamber forms a preheated hot water inlet. The preheated hot water outlet and the preheated hot water inlet are connected by a pipe.

4. The steam generating device according to claim 2, characterized in that: The furnace body has a water heating chamber at its center, and a heat conduction channel is formed around the water heating chamber. The heating element and water pipe are placed inside the heat conduction channel, and the conductive end of the heating element, the inlet of the water pipe, and the outlet of the water pipe are exposed outside the heat conduction channel.

5. The steam generating device according to claim 2, characterized in that: The heating element and the water pipe are intertwined, with the heating element tightly attached to the inner wall of the heat conduction channel.

6. A coffee machine water treatment device employing the steam generator as described in any one of claims 1-5, characterized in that: It includes a water tank, a first water pump, a three-way valve, a first solenoid valve, and a coffee brewing head. The inlet of the first water pump is connected to the outlet of the water tank, and the outlet of the first water pump is connected to the inlet of the first heating device of the steam generator. The three-way valve is installed on the pipeline between the first heating device and the second solenoid valve. The first port of the three-way valve is connected to the outlet of the first heating device, and the second port of the three-way valve is connected to the inlet of the second solenoid valve. The third port of the three-way valve is connected to the inlet of the first solenoid valve, and the outlet of the first solenoid valve is connected to the coffee brewing head to form a hot water channel. The first solenoid valve controls whether hot water enters the coffee brewing head.

7. The coffee machine water treatment device according to claim 6, characterized in that: It also includes a flow meter, one end of which is connected to the outlet of the water tank, and the other end of which is connected to the inlet of the first water pump; It also includes a safety relief valve, the inlet of which is connected to the outlet of the first water pump, the outlet of which is connected to the inlet of the first heating device, and the relief port of which is connected to the outlet of the water tank. It also includes a pressure relief pipe, wherein the pressure relief port of the first solenoid valve and the pressure relief port of the second solenoid valve are respectively connected to the inlet of the pressure relief pipe.

8. A water treatment device for a coffee machine employing a steam generator as described in any one of claims 1-5, comprising a water tank, a first water pump, a second water pump, a first solenoid valve, a coffee brewing head, and a third heating device, characterized in that: The inlet of the first water pump is connected to the outlet of the water tank, and the outlet of the first water pump is connected to the inlet of the first heating device of the steam generator. The inlet of the second water pump is connected to the outlet of the water tank, the outlet of the second water pump is connected to the inlet of the third heating device, the outlet of the third heating device is connected to the inlet of the first solenoid valve, and the outlet of the first solenoid valve is connected to the coffee brewing head to form a hot water channel. The first solenoid valve controls whether hot water enters the coffee brewing head.

9. The coffee machine water treatment device according to claim 8, characterized in that: It also includes a flow meter, one end of which is connected to the outlet of the water tank, and the other end of which is connected to the inlet of the second water pump; It also includes a safety relief valve, the inlet of which is connected to the outlet of the second water pump, the outlet of which is connected to the inlet of the third heating device, and the relief port of which is connected to the outlet of the water tank; The first solenoid valve has a first pressure relief pipe at its pressure relief port, and the second solenoid valve has a second pressure relief pipe at its pressure relief port.

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