Coffee machine with dry burning prevention and high steam output

Abstract

This utility model relates to the technical field of water circuits in coffee machines, proposing a coffee machine that combines anti-dry-burning and efficient steam output, comprising: a preheating pot for preheating cold water; a water pump connected to the preheating pot to input cold water into the preheating pot; a coffee pot for heating liquid and connected to the preheating pot, where cold water is heated and then reheated; and a steam pot for heating liquid to output steam, connected to the coffee pot, and equipped with a water level probe to detect the liquid level and prevent dry-burning. When the water level in the steam pot is below a detection threshold, the liquid is replenished into the steam pot after being heated by the water pump, preheating pot, and coffee pot. The connection between the steam pot and the coffee pot allows it to directly receive hot water from the coffee pot, significantly shortening steam heating time, reducing steam pressure fluctuations, and ensuring stable and continuous steam output.

Description

Technical Field

[0001] This utility model relates to the technical field of water circuits in coffee machines, specifically to a coffee machine that combines anti-dry burning and efficient steam output. Background Technology

[0002] Existing coffee machine water systems have two main technical flaws: 1. Existing coffee machines use a single heating pot, which is used to output hot water and steam. If the user misoperates, the heating tube inside the heating pot is very likely to run out of water during the switching between hot water and steam modes, causing a dry burning accident. This not only poses a serious safety hazard, but also significantly shortens the lifespan of the heating tube. 2. Existing coffee machines use coffee pots that can output hot water independently and steam pots that output steam independently. In actual operation, the steam pot needs to be frequently replenished with room temperature water (cold water) for heating. Due to the lag in the generation of steam from cold water, the steam pressure fluctuates, resulting in unstable steam output pressure and short steam output duration. Therefore, there is a problem of unstable steam output when the steam pot is replenished with water. Utility Model Content

[0003] This invention proposes a coffee machine that combines anti-dry-burning and efficient steam output. The preheating pot preheats cold water, preventing temperature fluctuations caused by cold water directly entering subsequent heating components. The water pump powers the entire water system, stably delivering cold water to the preheating pot and ensuring continuous water supply. The coffee pot reheats the preheated water, precisely controlling the water temperature to meet coffee-making requirements. Using preheated water as a heat source reduces its own heating load and shortens the time required to output hot coffee. The steam cooker is connected to the coffee cooker, allowing it to directly receive hot water from the coffee cooker. Compared to existing technologies where the steam cooker is supplemented with room temperature water, this significantly shortens steam heating time, reduces steam pressure fluctuations, and ensures stable and continuous steam output.

[0004] A coffee machine designed for this purpose, which combines anti-dry-burning and efficient steam output, includes: A water inlet mechanism is provided, which is equipped with a water pump and a preheating pot, with the water pump output end connected to the preheating pot. A hot water output mechanism is provided, on which a coffee pot is provided, and the coffee pot is connected to a preheating pot; A steam output mechanism is provided, which is equipped with a steam pot and connected to a coffee pot. The steam pot is equipped with a water level probe for detecting the liquid level. A water pump, a preheating pot, and a coffee pot are connected in sequence to form a water replenishment mechanism for the steam pot. When the steam pot is detected to be below the water level probe detection threshold, the water replenishment mechanism is activated. The liquid enters the steam pot after being heated by the preheating pot and the coffee pot, so that steam can be continuously and stably output when the steam pot is replenished. The water level probe detects that the water level in the steam cooker is below the detection threshold. The liquid is then replenished into the steam cooker after being heated by the water pump, the preheating pot, and the coffee pot.

[0005] The coffee machine, which combines anti-dry burning and efficient steam output, also includes a pressure relief mechanism, on which a water collection tray is provided; The coffee maker is provided with a first water outlet that is connected to the steam cooker. A first pressure relief and discharge assembly is provided between the first water outlet and the water receiving tray. The first water outlet, the first pressure relief and discharge assembly and the water receiving tray are connected in sequence. When the internal air pressure of the connecting pipe between the coffee maker and the steam cooker exceeds the threshold, the first pressure relief and discharge assembly discharges the gas-liquid mixture onto the water receiving tray.

[0006] The first pressure relief assembly includes a coffee protection valve and a first connecting tee, the first water outlet of the coffee pot is connected to the first end of the first connecting tee, the input end of the coffee protection valve is connected to the second end of the first connecting tee, and the output end of the coffee protection valve is connected to the water receiving tray.

[0007] The third end of the first connecting tee is provided with a steam inlet solenoid valve for switching the on / off state of the pipeline between the coffee maker and the steam maker. The third end of the first connecting tee, the steam inlet solenoid valve and the water inlet end of the steam maker are connected in sequence by pipeline.

[0008] The steam cooker is provided with a steam output end, and a second pressure relief and discharge assembly is provided between the steam output end and the water receiving pan. The steam output end of the steam cooker, the second pressure relief and discharge assembly and the water receiving pan are connected in sequence. When the internal gas pressure of the steam output pipeline of the steam cooker exceeds the threshold, the second pressure relief and discharge assembly discharges the gas-liquid mixture onto the water receiving pan. The steam cooker is equipped with a hot water outlet, which is independently spaced from the steam output end. A hot water solenoid valve and a hot water outlet pipe are provided on the outside of the hot water outlet. The hot water outlet, the hot water solenoid valve and the hot water outlet pipe are connected in sequence through pipes. The hot water solenoid valve is used to switch the on / off state between the hot water outlet and the hot water outlet pipe.

[0009] The second pressure relief assembly includes a steam protection valve and a second connecting tee. The steam cooker has a steam output end, which is connected to the first end of the second connecting tee. The input end of the steam protection valve is connected to the second end of the second connecting tee, and the output end of the steam protection valve is connected to the water receiving pan.

[0010] The third end of the second connecting tee is equipped with a steam solenoid valve and a steam output pipe. The third end of the second connecting tee, the steam solenoid valve and the steam output pipe are connected in sequence through a pipeline. The steam solenoid valve is used to switch the on / off state between the steam output pipe and the steam output end of the steam cooker.

[0011] The coffee maker is provided with a second water outlet for discharging hot coffee. A liquid discharge assembly is provided between the second water outlet and the water tray. The second water outlet, the liquid discharge assembly and the water tray are connected in sequence. The liquid output from the second water outlet of the coffee maker is discharged onto the water tray through the liquid discharge assembly.

[0012] The liquid discharge assembly includes a coffee water dispensing solenoid valve and a third connecting tee. The second water outlet of the coffee maker, the input end of the coffee water dispensing solenoid valve, and the third connecting tee are connected in sequence through pipes. One of the output ends of the coffee water dispensing solenoid valve is connected to the water receiving tray.

[0013] The coffee machine, which combines anti-dry burning and efficient steam output, also includes a flow meter for detecting whether there is a water flow signal. The water pump input is connected to the flow meter. When the flow meter detects a water flow signal, the preheating pot starts and heats the cold water.

[0014] The beneficial technical effects of this utility model are as follows: The preheating pot preheats cold water, preventing temperature fluctuations caused by cold water directly entering subsequent heating components. The water pump powers the entire water system, stably delivering cold water to the preheating pot and ensuring continuous water supply. The coffee maker reheats the preheated water, precisely controlling the water temperature to meet coffee-making requirements. Using preheated water as a heat source reduces its own heating load and shortens the time to output hot water for coffee. The steam maker connects to the coffee maker, allowing it to directly receive hot water from the coffee maker. Compared to existing technologies that add room-temperature water to the steam maker, this significantly shortens steam heating time, reduces steam pressure fluctuations, and ensures stable and continuous steam output. A water level probe monitors the liquid level in the steam maker in real time. When the water level falls below the detection threshold, the liquid is heated by the water pump, preheating pot, and coffee maker before entering the steam maker, promptly replenishing it with hot water and fundamentally preventing dry burning. Furthermore, by preheating the cold water in the preheating pot before it enters the coffee pot, the coffee pot maintains a stable temperature during continuous coffee making or when adding water to the steam pot. This effectively solves the problems of slow heating and unstable temperature caused by frequent addition of cold water in existing coffee pots, thus improving the quantity and consistency of coffee brewed. The overall structure, through the synergistic effect of its components, also overcomes the dry-burning hazard and unstable steam output issues of existing coffee machines, enhancing the user experience while ensuring safety. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a coffee maker that outputs hot water for coffee extraction according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the liquid discharge assembly of the present invention, showing the liquid being discharged onto the liquid receiving tray.

[0017] Figure 3 This is a schematic diagram of the structure of a steam cooker that outputs hot steam according to an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the structure of the first pressure relief and discharge assembly of this utility model, which discharges the gas-liquid mixture onto the water receiving tray.

[0019] Figure 5 This is a schematic diagram of the second pressure relief and discharge assembly of this utility model, which discharges the gas-liquid mixture onto the water receiving tray.

[0020] Figure 6 A schematic diagram of the structure of a steam cooker outputting hot water according to an embodiment of this utility model.

[0021] Figure 7 This is a schematic diagram of the structure of a steam cooker according to an embodiment of the present invention.

[0022] Figure 8 This is a schematic diagram of the water flow control structure of a coffee machine according to an embodiment of the present invention. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In order to make the above-mentioned objects, features and advantages of the present application more apparent and understandable, many specific details are set forth in the following description in order to provide a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0024] See Figures 1-7 A coffee machine that combines anti-dry-burning and efficient steam output includes: A water inlet mechanism is provided, which is equipped with a water pump 2 and a preheating pot 1, and the output end of the water pump 2 is connected to the preheating pot 1. A hot water output mechanism is provided, on which a coffee pot 3 is provided, and the coffee pot 3 is connected to the preheating pot 1; A steam output mechanism is provided, which is equipped with a steam pot 4 and a coffee pot 3. The steam pot 4 is equipped with a water level probe 5 for detecting the liquid level. The water pump 2, the preheating pot 1 and the coffee pot 3 are connected in sequence to form a water replenishment mechanism for the steam pot 4. When the steam pot 4 is detected to be below the detection threshold of the water level probe 5, the water replenishment mechanism is activated. The liquid enters the steam pot 4 after being heated by the preheating pot 1 and the coffee pot 3, so that steam can be continuously and stably output when the steam pot 4 is replenished. The water level probe 5 detects that the water level in the steam cooker 4 is lower than the detection threshold. After being heated by the water pump 2, the preheating pot 1 and the coffee pot 3, the liquid is added to the steam cooker 4.

[0025] The preheating pot 1 preheats cold water, preventing temperature fluctuations caused by cold water directly entering subsequent heating components. The water pump 2 provides power to the entire water system, stably delivering cold water to the preheating pot 1 and ensuring continuous water supply. The coffee pot 3 reheats the preheated water, precisely controlling the water temperature to meet coffee-making requirements. Using preheated water as a heat source reduces its own heating load and shortens the time required to output hot coffee. The steam pot 4 is connected to the coffee pot 3, allowing it to directly receive hot water from the coffee pot 3. Compared to existing technologies that add room temperature water to the steam pot, this significantly shortens steam heating time, reduces steam pressure fluctuations, and ensures stable and continuous steam output. The water level probe 5 monitors the liquid level in the steam pot 4 in real time. When the water level falls below the detection threshold, the liquid is heated by the water pump 2, preheating pot 1, and coffee pot 3 before entering the steam pot 4, promptly replenishing the steam pot with hot water and fundamentally preventing dry burning. Furthermore, cold water is preheated by the preheating pot 1 before entering the coffee pot 3, ensuring a stable temperature in the coffee pot 3 during continuous coffee making or when adding water to the steam pot 4. This effectively solves the problem of slow heating and unstable temperature in existing coffee pot 3 due to frequent addition of cold water, thus improving the quantity and consistency of coffee brewed. The overall structure, through the synergistic effect of its components, overcomes the dry-burning hazard and unstable steam output issues of existing coffee machines, enhancing the user experience while ensuring safety.

[0026] The coffee machine that combines anti-dry burning and efficient steam output also includes a pressure relief mechanism. The pressure relief mechanism is equipped with a water tray 6, which is fixedly installed on the body of the coffee machine. The water tray 6 is correspondingly set with the output end of the pressure relief mechanism. The coffee maker 3 is provided with a first water outlet that is connected to the steam maker 4. A first pressure relief and discharge assembly 7 is provided between the first water outlet and the water receiving tray 6. The first water outlet of the coffee maker 3, the first pressure relief and discharge assembly 7 and the water receiving tray 6 are connected in sequence. When the internal air pressure of the connecting pipe between the coffee maker 3 and the steam maker 4 exceeds the threshold, the first pressure relief and discharge assembly 7 discharges the gas-liquid mixture onto the water receiving tray 6.

[0027] The drip tray 6 provides a safe liquid discharge area for the entire water system, preventing excess liquid from leaking directly into the machine's interior or external environment, maintaining a clean operating environment, and reducing the risk of electrical malfunctions caused by liquid leaks. The first water outlet of the coffee maker 3 is connected to the drip tray 6 via the first pressure relief assembly 7. When the internal pressure of the connecting pipe between the coffee maker 3 and the steam maker 4 exceeds a threshold, the first pressure relief assembly 7 can promptly discharge the gas-liquid mixture to the drip tray 6, effectively preventing pipe rupture or damage due to excessive pressure. This protects the structural integrity of core components such as the coffee maker 3, steam maker 4, and connecting pipes, extending the machine's lifespan. Simultaneously, this structure does not affect normal water system operation. When the coffee maker 3 generates excessive steam while boiling water, leading to high internal pressure, the first pressure relief assembly 7 provides pressure relief protection.

[0028] The first pressure relief assembly 7 includes a coffee protection valve 12 and a first connecting tee 13. The first water outlet of the coffee pot 3 is connected to the first end of the first connecting tee 13, the input end of the coffee protection valve 12 is connected to the second end of the first connecting tee 13, and the output end of the coffee protection valve 12 is connected to the water receiving tray 6.

[0029] The coffee protection valve 12 in the first pressure relief assembly 7 is the core component for pressure control. It can accurately sense changes in air pressure within the pipeline and automatically open when the air pressure exceeds a preset threshold, safely discharging the gas-liquid mixture to the water tray 6, effectively preventing pipeline pressure overload caused by untimely pressure relief. The first connecting tee 13 achieves pipeline diversion between the first water outlet of the coffee pot 3, the coffee protection valve 12, and the steam pot 4. This allows the liquid output from the coffee pot 3 to flow normally to the steam pot 4 to meet water replenishment needs, and also allows for rapid pressure relief through the coffee protection valve 12 in case of abnormal pressure, ensuring smooth switching of the water system under different operating conditions. This structural design ensures the continuity of water replenishment to the steam pot 4 and provides double protection for the pipeline between the coffee pot 3 and the steam pot 4 through the precise pressure relief function of the coffee protection valve 12, avoiding the impact of pressure fluctuations on the coffee pot 3 and the steam pot 4. In the prior art, unstable pipeline pressure may affect steam output and coffee making results. However, this structure, through the synergistic effect of the coffee protection valve 12 and the first connecting tee 13, keeps the pressure within a safe range, ensuring the stability of steam output and the consistency of coffee making quality, while reducing machine maintenance costs and failure rate.

[0030] The third end of the first connecting tee 13 is provided with a steam inlet solenoid valve 14 for switching the on / off state of the pipeline between the coffee maker 3 and the steam maker 4. The third end of the first connecting tee 13, the steam inlet solenoid valve 14 and the water inlet end of the steam maker 4 are connected in sequence by pipelines.

[0031] The steam inlet solenoid valve 14 is located on the outside of the third end of the first connecting tee 13, and can precisely control the on / off state of the pipeline between the coffee maker 3 and the steam maker 4. When the water level probe 5 of the steam maker 4 detects that the water level is lower than the detection threshold, the steam inlet solenoid valve 14 opens in time, allowing hot water from the coffee maker 3 to quickly replenish the steam maker 4, ensuring the continuous and stable operation of the steam maker 4. When the water level reaches the detection threshold, the steam inlet solenoid valve 14 closes quickly to prevent excessive hot water replenishment from causing abnormal pressure in the steam maker 4, thereby precisely controlling the water level and pressure balance of the steam maker 4. The rapid response characteristic of the steam inlet solenoid valve 14 makes the timing of water replenishment in the steam maker 4 more precise, reduces steam pressure fluctuations caused by delayed water replenishment, ensures that the pressure gauge does not drop significantly when steam is output, and improves the continuity and stability of steam output. In addition, the steam inlet solenoid valve 14 makes the water circuit connection between the coffee maker 3 and the steam maker 4 more flexible and controllable. During machine operation, the water circuit can be intelligently adjusted according to the actual working conditions (such as making coffee or outputting steam), avoiding mutual interference between the two components and further improving the operating efficiency and reliability of the entire system.

[0032] The steam cooker 4 is provided with a steam output end. A second pressure relief and discharge assembly 8 is provided between the steam output end and the water receiving pan 6. The steam output end of the steam cooker 4, the second pressure relief and discharge assembly 8 and the water receiving pan 6 are connected in sequence. When the internal gas pressure of the steam output pipeline of the steam cooker 4 exceeds the threshold, the second pressure relief and discharge assembly 8 discharges the gas-liquid mixture onto the water receiving pan 6. The steam cooker 4 is provided with a hot water outlet end, which is independently spaced from the steam output end. A hot water solenoid valve 18 and a hot water outlet pipe 19 are provided on the outside of the hot water outlet end. The hot water outlet end, the hot water solenoid valve 18 and the hot water outlet pipe 19 are connected in sequence through pipes. The hot water solenoid valve 18 is used to switch the on and off state between the hot water outlet end and the hot water outlet pipe 19.

[0033] The steam output end of the steam cooker 4 is connected to the second pressure relief assembly 8 and the water receiving pan 6. When the internal pressure of the steam output pipeline exceeds the threshold, the second pressure relief assembly 8 can discharge the gas-liquid mixture to the water receiving pan 6, effectively preventing excessive steam pressure from damaging components such as the steam cooker 4 and the steam output pipe, thus ensuring the safe operation of the steam output system. The hot water outlet end of the steam cooker 4 is independently set and does not interfere with the steam output end. Combined with the hot water solenoid valve 18 and the hot water outlet pipe 19, the hot water output can be independently controlled, avoiding the mutual interference caused by the shared output channel of hot water and steam in existing technologies, and improving the stability and accuracy of hot water output. The hot water solenoid valve 18 can precisely control the on / off connection between the hot water outlet end and the hot water outlet pipe 19 according to usage requirements, ensuring that the timing and flow of hot water output are controllable, thus improving user convenience. Regarding steam output, since the steam boiler 4 uses hot water from the coffee boiler 3, combined with the pressure protection of the second pressure relief assembly 8, the steam output pressure is more stable and lasts longer. As for hot water output, because the hot water is heated twice—by the preheating boiler 1 and the coffee boiler 3—the water temperature is stable and the output is controllable, meeting diverse user needs for hot water. Simultaneously, the drip tray 6 collects the gas-liquid mixture and any liquid output from the pressure relief, keeping the machine clean, reducing maintenance costs, and ensuring the coffee machine maintains good operating condition in both home and commercial settings.

[0034] The second pressure relief assembly 8 includes a steam protection valve 15 and a second connecting tee 16. The steam cooker 4 is provided with a steam output end, which is connected to the first end of the second connecting tee 16. The input end of the steam protection valve 15 is connected to the second end of the second connecting tee 16, and the output end of the steam protection valve 15 is connected to the water receiving tray 6.

[0035] The steam protection valve 15 in the second pressure relief assembly 8 is specifically designed to control the pressure in the steam output pipeline. It can precisely set a pressure threshold. When the internal pressure in the steam output pipeline of the steam cooker 4 exceeds the threshold, the steam protection valve 15 opens rapidly, effectively protecting the safety of the steam output system. The second connecting tee 16 separates the pipeline between the steam output end, the steam protection valve 15, and the steam output pipe. This allows steam to flow smoothly to the steam output pipe during normal output, and enables safe pressure relief through the steam protection valve 15 in case of abnormal pressure, ensuring the continuity and safety of steam output. This structural design does not affect the normal steam output function and can quickly activate the protection mechanism in case of abnormal pressure, avoiding unstable steam output caused by steam pressure fluctuations or excessively high pressure. Combined with the hot water replenishment design of the steam cooker 4, the synergistic effect of the steam protection valve 15 and the second connecting tee 16 further stabilizes the steam output pressure, extends the steam operating time, reduces the risk of machine failure due to pressure problems, and improves the overall reliability and service life of the steam system.

[0036] The third end of the second connecting tee 16 is provided with a steam solenoid valve 11 and a steam output pipe 17. The third end of the second connecting tee 16, the steam solenoid valve 11 and the steam output pipe 17 are connected in sequence through a pipeline. The steam solenoid valve 11 is used to switch the on / off state between the steam output pipe 17 and the steam output end of the steam cooker 4.

[0037] The steam solenoid valve 11 on the outer side of the third end of the second connecting tee 16 works in conjunction with the steam output pipe 17 to make steam output control more precise. The steam solenoid valve 11 can quickly switch the on / off state between the steam output pipe 17 and the steam output end of the steam cooker 4 according to usage needs, opening rapidly when steam is needed to ensure timely steam output, and closing promptly when steam is not needed. The second connecting tee 16 provides a flexible switching channel for the direction of steam flow, allowing steam to be output normally through the steam output pipe 17, and also to be discharged to the water receiving pan 6 through the steam protection valve 15 when the pressure exceeds the limit, ensuring the stable operation of the steam system under different operating conditions. Compared with the existing technology with no precise control of steam output, the steam solenoid valve 11 makes the timing and duration of steam output controllable, improving the convenience of user operation; by controlling the opening and closing of the steam solenoid valve 11, the steam output can be cut off when only hot water is being output.

[0038] The coffee maker 3 is provided with a second water outlet for discharging hot coffee. A liquid discharge assembly 9 is provided between the second water outlet and the water receiving tray 6. The second water outlet of the coffee maker 3, the liquid discharge assembly 9 and the water receiving tray 6 are connected in sequence. The liquid output from the second water outlet of the coffee maker 3 is discharged onto the water receiving tray 6 through the liquid discharge assembly 9.

[0039] The liquid discharge assembly 9 includes a coffee water outlet solenoid valve 20 and a third connecting tee 21. The second water outlet of the coffee pot 3, the input end of the coffee water outlet solenoid valve 20 and the third connecting tee 21 are connected in sequence through pipes. One of the output ends of the coffee water outlet solenoid valve 20 is connected to the water receiving tray 6.

[0040] The second water outlet of the coffee maker 3 is connected to the drip tray 6 via the liquid discharge assembly 9. The liquid discharge assembly 9 promptly drains excess liquid from the second water outlet of the coffee maker 3 to the drip tray 6, preventing liquid from spilling into the machine's interior or onto the external surface, maintaining the machine's cleanliness and reducing the risk of electrical malfunctions or component corrosion caused by liquid leaks. The coffee dispensing solenoid valve 20 and the third connecting tee 21 in the liquid discharge assembly 9 work together to make coffee output control more precise. The coffee dispensing solenoid valve 20 controls the connection and disconnection of the second water outlet of the coffee maker 3 with the subsequent pipeline, ensuring precise control of the water volume and timing during coffee making, improving the consistency and quality stability of coffee production. The third connecting tee 21 diverts the flow of coffee output and excess liquid collection, allowing normal coffee output to proceed smoothly while guiding excess liquid to the drip tray 6, avoiding resource waste and contamination. During the coffee brewing process, cold water is preheated in the preheating pot 1 before entering the coffee pot 3, ensuring a stable temperature for the coffee pot 3. Combined with the liquid collection function of the liquid collection and discharge assembly 9, this results in a more stable temperature and flow rate for the coffee output. This effectively solves the problems of large temperature fluctuations and slow heating in the coffee pot 3 during continuous coffee brewing in existing technologies, improving the quantity of coffee that can be refilled and the consistency of its taste. Furthermore, the design of the liquid collection and discharge assembly 9 does not affect the normal operation of the coffee pot 3, ensuring the quality of coffee brewing while improving the ease of use and lifespan of the machine.

[0041] The coffee machine, which combines anti-dry burning and efficient steam output, also includes a flow meter 10 for detecting whether there is a water flow signal. The input end of the water pump 2 is connected to the flow meter 10. When the flow meter 10 detects a water flow signal, the preheating pot 1 starts and heats the cold water.

[0042] A flow meter 10 is installed at the input of the water pump 2. It can detect water flow in real time. The preheater 1 only starts heating cold water when the flow meter 10 detects water flow. This design fundamentally avoids dry burning of the preheater 1 when there is no water, effectively protecting the heating components, extending its lifespan, and reducing safety hazards caused by dry burning. The flow meter 10 also forms an effective linkage protection mechanism, enhancing system safety. Simultaneously, the flow meter 10 ensures that only effective water flow enters the preheater 1, making its heating operation more targeted, avoiding energy waste, and improving energy efficiency. When the water pump 2 delivers cold water, the flow meter 10 detects the flow, and the preheater 1 starts heating promptly, ensuring effective preheating of the cold water. This provides a stable water source for the subsequent secondary heating of the coffee maker 3, ensuring that the temperature of the coffee maker 3 does not fluctuate significantly when continuously making coffee or replenishing water for the steam maker 4, thus improving the stability of coffee production and the number of cups that can be refilled. In addition, the flow meter 10 makes the operation of the water system more controllable. By detecting the water flow, it is possible to indirectly determine whether the water circuit is unobstructed, which facilitates the diagnosis of machine faults and reduces maintenance costs.

[0043] The inlet of the flow meter 10 is connected to a water source, such as bottled water, water tank, or external water (0.1-0.4MPa), via a pipeline.

[0044] The third connection tee 21 is connected to the coffee pressure gauge 22 via a pipeline.

[0045] The steam cooker 4 is connected to the steam pressure gauge 23 via a pipe.

[0046] See Figure 1 When the water pump 2 is running, the bottled water passes through the flow meter 10 and enters the preheating pot 1 for preheating. The preheated water then enters the coffee pot 3 for heating. When hot water is needed to extract coffee, the coffee outlet solenoid valve 20 is opened. The heated liquid in the coffee pot 3 can be output through the coffee outlet solenoid valve 20 and the third connecting tee 21 to mix the hot water with the coffee powder to form coffee.

[0047] See Figure 2 When the coffee maker 3 is extracting hot water for coffee and there is an excessive amount of hot water output, the liquid will be output to the water collection tray 6 through the corresponding pipeline.

[0048] See Figure 3 , Figure 4 When the hot water from the coffee maker 3 flows to the steam maker 4, if the internal air pressure in the pipeline is too high, the coffee protection valve 12 opens, and the gas-liquid mixture is discharged onto the water collection tray 6.

[0049] See Figure 5When the steam boiler 4 outputs steam, if the internal air pressure in the pipeline is too high, the steam protection valve 15 will open, and the gas-liquid mixture will be discharged onto the water receiving pan 6.

[0050] The coffee maker 3 may also have a liquid level detector. The preheating pot 1, coffee maker 3 and steam pot 4 are all equipped with heaters.

[0051] See Figure 8 The working principle of the water circuit in the above coffee machine is as follows: 1. Upon initial power-on, after the water level probe 5 of the steam cooker 4 detects the water level signal, the machine begins to replenish water. Water pump 2 generates suction, drawing cold water through flow meter 10 to water pump 2 and then to preheating cooker 1. Preheating cooker 1 only begins to preheat the cold water if flow meter 10 detects a water flow signal. If flow meter 10 does not detect a water flow signal, preheating cooker 1 does not operate. After coffee cooker 3 is full, water is added to steam cooker 4 through steam inlet solenoid valve 14. The machine stops replenishing water once the water level in steam cooker 4 reaches the level detected by water level probe 5. This water circuit effectively prevents the heating element of coffee cooker 3 from dry-burning and extends its lifespan. 2. Once the machine has preheated, continue to supply steam or hot water. When the water level in steam pot 4 drops below the level detected by water level probe 5, the machine begins to replenish water. Water pump 2 draws cold water into preheating pot 1, which then preheats the cold water before supplying it to coffee pot 3. Hot water from coffee pot 3 is then supplied to steam pot 4 via steam inlet solenoid valve 14. Once the water level in steam pot 4 reaches the level detected by water level probe 5, the machine stops replenishing water. This water circuit directly supplies hot water from the coffee pot to steam pot 4, offering advantages over cold water replenishment, such as the pressure gauge not returning to zero during steam replenishment and faster steam heating.

[0052] 3. When making coffee, cold water is preheated in preheater 1 before being added to coffee pot 3. Compared to adding cold water directly to coffee pot 3, this effectively solves problems such as unstable temperature of coffee pot 3 due to continuous coffee making or water replenishment in steam pot 4, as well as slow heating of coffee pot 3. It effectively improves the temperature stability of coffee pot 3 and increases the number of cups of coffee that can be refilled. This technical solution can be widely used in home and commercial semi-automatic coffee machines. This water circuit solves three major difficulties in the industry and has advantages such as low manufacturing cost, anti-dry burning of heating element, fast steam heating, and stable coffee temperature.

[0053] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A coffee machine that combines anti-dry-burning and high-efficiency steam output, characterized in that, include: The water inlet mechanism is equipped with a water pump (2) and a preheating pot (1), and the output end of the water pump (2) is connected to the preheating pot (1); A hot water output mechanism is provided, and a coffee pot (3) is provided on the hot water output mechanism. The coffee pot (3) is connected to the preheating pot (1). A steam output mechanism is provided, which is equipped with a steam pot (4) and a coffee pot (3). The steam pot (4) is equipped with a water level probe (5) for detecting the liquid position. The water pump (2), the preheating pot (1) and the coffee pot (3) are connected in sequence to form a water replenishment mechanism for the steam pot (4). When the steam pot (4) is detected to be below the detection threshold of the water level probe (5), the water replenishment mechanism is activated. The liquid enters the steam pot (4) after being heated by the preheating pot (1) and the coffee pot (3), so that steam can be continuously and stably output when the steam pot (4) is replenished.

2. The coffee machine with both anti-dry-burning and high-efficiency steam output as described in claim 1, characterized in that: It also includes a pressure relief mechanism, which is provided with a water receiving tray (6). The coffee maker (3) is provided with a first water outlet that is connected to the steam maker (4). A first pressure relief assembly (7) is provided between the first water outlet and the water receiving tray (6). The first water outlet of the coffee maker (3), the first pressure relief assembly (7) and the water receiving tray (6) are connected in sequence. When the internal air pressure of the connecting pipe between the coffee maker (3) and the steam maker (4) exceeds the threshold, the first pressure relief assembly (7) discharges the gas-liquid mixture onto the water receiving tray (6).

3. The coffee machine with both anti-dry-burning and high-efficiency steam output as described in claim 2, characterized in that: The first pressure relief assembly (7) includes a coffee protection valve (12) and a first connecting tee (13). The first water outlet of the coffee pot (3) is connected to the first end of the first connecting tee (13), the input end of the coffee protection valve (12) is connected to the second end of the first connecting tee (13), and the output end of the coffee protection valve (12) is connected to the water receiving tray (6).

4. The coffee machine with both anti-dry-burning and high-efficiency steam output as described in claim 3, characterized in that: The third end of the first connecting tee (13) is provided with a steam inlet solenoid valve (14) for switching the on / off state of the pipeline between the coffee maker (3) and the steam maker (4). The third end of the first connecting tee (13), the steam inlet solenoid valve (14) and the water inlet end of the steam maker (4) are connected in sequence by pipeline.

5. The coffee machine with both anti-dry-burning and high-efficiency steam output as described in claim 2, characterized in that: The steam cooker (4) is provided with a steam output end, and a second pressure relief and discharge assembly (8) is provided between the steam output end and the water receiving pan (6). The steam output end of the steam cooker (4), the second pressure relief and discharge assembly (8) and the water receiving pan (6) are connected in sequence. When the internal gas pressure of the steam output pipeline of the steam cooker (4) exceeds the threshold, the second pressure relief and discharge assembly (8) discharges the gas-liquid mixture onto the water receiving pan (6). The steam cooker (4) is provided with a hot water outlet. The hot water outlet and the steam output are set independently and spaced apart. A hot water solenoid valve (18) and a hot water outlet pipe (19) are provided on the outside of the hot water outlet. The hot water outlet, the hot water solenoid valve (18) and the hot water outlet pipe (19) are connected in sequence through pipelines. The hot water solenoid valve (18) is used to switch the on and off state between the hot water outlet and the hot water outlet pipe (19).

6. The coffee machine with both anti-dry-burning and high-efficiency steam output as described in claim 5, characterized in that: The second pressure relief assembly (8) includes a steam protection valve (15) and a second connecting tee (16). The steam cooker (4) is provided with a steam output end, which is connected to the first end of the second connecting tee (16). The input end of the steam protection valve (15) is connected to the second end of the second connecting tee (16), and the output end of the steam protection valve (15) is connected to the water receiving pan (6).

7. The coffee machine with both anti-dry-burning and high-efficiency steam output as described in claim 6, characterized in that: The third end of the second connecting tee (16) is provided with a steam solenoid valve (11) and a steam output pipe (17). The third end of the second connecting tee (16), the steam solenoid valve (11) and the steam output pipe (17) are connected in sequence through a pipeline. The steam solenoid valve (11) is used to switch the on / off state between the steam output pipe (17) and the steam output end of the steam cooker (4).

8. The coffee machine with both anti-dry-burning and high-efficiency steam output as described in claim 2, characterized in that: The coffee maker (3) is provided with a second water outlet for outputting hot coffee. A liquid discharge assembly (9) is provided between the second water outlet and the water receiving tray (6). The second water outlet of the coffee maker (3), the liquid discharge assembly (9) and the water receiving tray (6) are connected in sequence. The liquid output from the second water outlet of the coffee maker (3) is discharged onto the water receiving tray (6) through the liquid discharge assembly (9).

9. The coffee machine according to claim 8, which combines anti-dry-burning and high-efficiency steam output, is characterized in that: The liquid discharge assembly (9) includes a coffee water solenoid valve (20) and a third connecting tee (21). The second water outlet of the coffee pot (3), the input end of the coffee water solenoid valve (20), and the third connecting tee (21) are connected in sequence through pipes. One of the output ends of the coffee water solenoid valve (20) is connected to the water receiving tray (6).

10. The coffee machine according to claim 1, which combines anti-dry-burning and high-efficiency steam output, is characterized in that: It also includes a flow meter (10) for detecting whether there is a water flow signal. The input end of the water pump (2) is connected to the flow meter (10). When the flow meter (10) detects a water flow signal, the preheating pot (1) starts and heats the cold water.

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