Coffee machine capable of preventing dry burning and efficiently outputting steam and control method thereof

Abstract

The invention relates to the technical field of coffee machine waterways, and provides a coffee machine capable of preventing dry burning and efficiently outputting steam, comprising: a preheating pot for preheating cold water; the output end of the water pump is communicated with the preheating pot so as to input cold water into the preheating pot; the coffee pot is used for heating liquid and is communicated with the preheating pot, and cold water is heated by the preheating pot and then enters the coffee pot for secondary heating; the steam pot is used for heating liquid to output steam, the steam pot is communicated with the coffee pot, and a water level probe used for detecting the liquid position height of the steam pot to prevent the steam pot from dry burning is arranged in the steam pot; the water level probe detects that the water level of the steam cooker is lower than a detection threshold value, and liquid is supplemented into the steam cooker after being heated by the water pump, the preheating cooker and the coffee cooker. The steam pot is communicated with the coffee pot, so that the steam pot can directly receive hot water of the coffee pot, the steam heating time is greatly shortened, steam pressure fluctuation is reduced, and stable steam endurance output is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of water circuits of coffee machines, and in particular to a coffee machine with both dry-boiling prevention and efficient steam output, and a control method thereof. Background Art

[0002] There are two major technical defects in the existing coffee machine water system: 1. Existing coffee machines use a single heating pot, which is used to output both hot water and hot steam. If the user makes a mistake in operating the heating pot, the heating tube inside the pot can be easily dehydrated when switching between hot water and steam modes, causing a dry burn accident. This not only poses a serious safety hazard, but also significantly shortens the service life of the heating tube. 2. Existing coffee machines use coffee pots that can independently output hot water and steam pots that can independently output steam. In actual operation, the steam pot needs to be frequently replenished with room temperature water (cold water) for heating. Since there is a lag in the steam generated by heating cold water, the steam pressure fluctuates, which manifests as unstable steam output pressure and short steam output duration. Therefore, there is a problem of unstable steam endurance when the steam pot is replenished with water. Summary of the Invention

[0003] The present invention provides a coffee machine and a control method thereof that both prevents dry boiling and outputs steam efficiently. The preheating pot can preheat cold water to prevent temperature fluctuations caused by cold water directly entering the subsequent heating components; the water pump provides power to the entire water system, stably delivering cold water to the preheating pot to ensure the continuity of the water supply. The coffee pot reheats the preheated water, which can not only accurately control the water temperature to meet the requirements of coffee making, but also reduces its own heating load and shortens the time it takes to output hot water for coffee by using preheated water as a heat source. The steam pot is connected to the coffee pot so that it can directly receive hot water from the coffee pot. Compared with the prior art method of replenishing the steam pot with room temperature water, this greatly shortens the steam heating time, reduces steam pressure fluctuations, and ensures stable and continuous steam output.

[0004] A coffee machine designed for this purpose, which has both dry-boiling prevention and efficient steam output, comprises: A water inlet mechanism, wherein the water inlet mechanism is provided with a water pump and a preheating pot, and an output end of the water pump is connected to the preheating pot; A hot water output mechanism, wherein the hot water output mechanism is provided with a coffee pot, and the coffee pot is connected to the preheating pot; A steam output mechanism, wherein the steam output mechanism is provided with a steam pot, which is connected to the coffee pot. The steam pot is provided with a water level probe for detecting the liquid position. The water pump, the preheating pot, and the coffee pot are sequentially connected to form a water replenishment mechanism for the steam pot. When the steam pot detects that the water level is below a detection threshold of the probe, the water replenishment mechanism is activated, and the liquid is heated by the preheating pot and the coffee pot and then enters the steam 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 pot is lower than the detection threshold, and the liquid is heated by the water pump, preheating pot and coffee pot and then added to the steam pot.

[0005] The coffee machine with both dry-boiling prevention and efficient steam output also includes a pressure relief mechanism, and a water receiving tray is provided on the pressure relief mechanism; The coffee maker is provided with a first water outlet end connected to the steam maker, and a first pressure relief and discharge assembly is provided between the first water outlet end and the water receiving tray. The first water outlet end of the coffee maker, 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 maker exceeds a threshold value, the first pressure relief and discharge assembly discharges the gas-liquid mixture into the water receiving tray.

[0006] The first pressure relief and discharge 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] A steam water inlet solenoid valve is provided on the outside of the third end of the first connecting tee for switching the on-off state of the pipeline between the coffee maker and the steam cooker. The third end of the first connecting tee, the steam water inlet solenoid valve and the water inlet end of the steam cooker are connected in sequence through pipelines.

[0008] The steam cooker is provided with a steam output end, and a second pressure relief discharge assembly is provided between the steam output end and the water receiving tray. The steam output end of the steam cooker, the second pressure relief discharge assembly and the water receiving tray are sequentially connected. When the internal air pressure of the steam output pipeline of the steam cooker exceeds a threshold value, the second pressure relief discharge assembly discharges the gas-liquid mixture into the water receiving tray. The steam cooker is provided with a hot water outlet end, which is independently spaced apart 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 end. The hot water outlet end, the hot water solenoid valve and the hot water outlet pipe are connected in sequence through pipelines. The hot water solenoid valve is used to switch the on-off state between the hot water outlet end and the hot water outlet pipe.

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

[0010] A steam solenoid valve and a steam output pipe are provided on the outside of the third end of the second connecting tee. The third end of the second connecting tee, the steam solenoid valve and the steam output pipe are connected in sequence through pipelines. 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 water, and a liquid receiving and discharging assembly is provided between the second water outlet and the water receiving tray. The second water outlet of the coffee maker, the liquid receiving and discharging assembly and the water receiving tray are sequentially connected, and the liquid output from the second water outlet of the coffee maker is discharged into the water receiving tray through the liquid receiving and discharging assembly.

[0012] The liquid receiving and discharging assembly includes a coffee water outlet solenoid valve and a third connecting tee. The second water outlet end of the coffee pot, the input end of the coffee water outlet solenoid valve and the third connecting tee are connected in sequence through pipes; one output end of the coffee water outlet solenoid valve is connected to the water receiving tray.

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

[0014] A control method for a coffee machine with both dry-boiling protection and efficient steam output is designed for this purpose. The water pump input is connected to a flow meter, and a steam inlet solenoid valve is installed in the pipeline between the coffee pot and the steam pot. The control method is as follows: When the coffee machine is started and the water level probe detects that the water level in the steam pot is lower than the detection threshold, the water pump is started and the cold water is pumped to the preheating pot for preheating; the preheated liquid enters the coffee pot, and when the liquid in the coffee pot is full or reaches the preset liquid threshold, the liquid in the coffee pot enters the steam pot through the steam inlet solenoid valve; if the water level in the steam pot reaches the detection threshold, the steam inlet solenoid valve is closed and water replenishment is stopped, and the preheating pot starts heating only after the flow meter detects a water flow signal.

[0015] A control method for a coffee machine with both dry-boiling protection and efficient steam output is designed for this purpose. The steam pot is provided with a steam output end. A second pressure relief and discharge assembly is provided between the steam output end and the water receiving tray. The second pressure relief and discharge assembly includes a steam protection valve. The coffee maker is provided with a second water outlet for discharging hot coffee water, and a liquid receiving and discharging assembly is provided between the second water outlet and the water receiving tray, and the control method thereof is as follows: When the coffee maker and / or steam cooker is heating liquid, if the air pressure in the pipeline is too high, the protection valve of the corresponding pressure relief and discharge assembly opens, and the gas-liquid mixture in the pipeline is discharged to the water receiving tray; When the coffee maker outputs hot coffee water, the liquid output from the second water outlet of the coffee maker is discharged onto the water receiving tray through the liquid receiving and discharging assembly.

[0016] The beneficial technical effects of the present invention are as follows: The preheater preheats cold water, preventing temperature fluctuations caused by cold water directly entering the subsequent heating components. The water pump provides power to the entire water system, steadily delivering cold water to the preheater and ensuring a continuous water supply. The coffee maker reheats the preheated water, precisely controlling the water temperature to meet coffee-making requirements. By using preheated water as a heat source, it reduces its own heating load and shortens the time it takes to produce hot coffee water. The steam maker is connected to the coffee maker, allowing it to directly receive hot water from the coffee maker. Compared to existing methods that refill the steam maker with room-temperature water, this significantly shortens steam heating time and reduces steam pressure fluctuations, ensuring consistent 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 passing through the water pump, preheater, and coffee maker before entering the steam maker, allowing it to be refilled with hot water in a timely manner, fundamentally preventing dry-boiling. Furthermore, cold water is preheated in the preheater before entering the coffee maker, ensuring a stable temperature during continuous coffee brewing or when refilling the steamer. This effectively addresses the slow heating and temperature instability issues associated with frequent cold water additions in existing coffee makers, improving both refill capacity and quality consistency. The overall structure, through the synergistic effect of its components, overcomes the potential for dry-boiling and unstable steam output common in existing coffee makers, enhancing the user experience while ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 1 is a schematic diagram of the structure of a coffee maker outputting hot water for extracting coffee according to an embodiment of the present invention.

[0018] Figure 2 The figure is a schematic structural diagram of a liquid receiving and discharging assembly according to an embodiment of the present invention discharging liquid onto a liquid receiving tray.

[0019] Figure 3 This is a schematic diagram of the structure of a steam cooker outputting hot steam according to an embodiment of the present invention.

[0020] Figure 4 This is a structural schematic diagram of a first pressure relief and discharge assembly discharging a gas-liquid mixture onto a water receiving tray according to an embodiment of the present invention.

[0021] Figure 5 This is a structural schematic diagram of a second pressure relief and discharge assembly discharging a gas-liquid mixture onto a water receiving tray according to an embodiment of the present invention.

[0022] Figure 6 This is a schematic structural diagram of a steam boiler outputting hot water according to an embodiment of the present invention.

[0023] Figure 7 Schematic diagram of the structure of a steam cooker according to an embodiment of the present invention.

[0024] Figure 8 Schematic diagram of the water flow control structure of a coffee machine according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, many specific details are set forth in the following description to facilitate 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 violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0026] See also Figure 1-Figure 7 , a coffee machine with both dry-boiling prevention and efficient steam output, comprising: A water inlet mechanism, wherein the water inlet mechanism is provided with a water pump 2 and a preheating pot 1, and an output end of the water pump 2 is connected to the preheating pot 1; A hot water output mechanism, wherein the hot water output mechanism is provided with a coffee pot 3, and the coffee pot 3 is connected to the preheating pot 1; a steam output mechanism, wherein the steam output mechanism is provided with a steam pot 4, which is connected to the coffee pot 3 and is provided 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 sequentially connected to form a water replenishment mechanism for the steam pot 4; when the steam pot 4 detects that the water level is below the detection threshold of the probe 5, the water replenishment mechanism is activated, and the liquid is heated by the preheating pot 1 and the coffee pot 3 and then enters the steam pot 4, 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 pot 4 is lower than the detection threshold, and the liquid is heated by the water pump 2, the preheating pot 1 and the coffee pot 3 and then replenished into the steam pot 4.

[0027] The water level probe 5 detects that the water level in the steam pot 4 is lower than the detection threshold, and the liquid is heated by the water pump 2, the preheating pot 1 and the coffee pot 3 and then replenished into the steam pot 4.

[0028] Preheater 1 preheats cold water, preventing temperature fluctuations caused by cold water directly entering subsequent heating components. Water pump 2 provides power for the entire water system, steadily delivering cold water to preheater 1 and ensuring a continuous water supply. Coffee maker 3 reheats the preheated water, precisely controlling the water temperature to meet coffee brewing requirements. By using preheated water as a heat source, it reduces its own heating load and shortens the time it takes to deliver hot coffee water. Steamer 4 is connected to coffee maker 3, allowing it to directly receive hot water from coffee maker 3. Compared to existing methods that refill the steamer with room-temperature water, this significantly shortens steam heating time and reduces steam pressure fluctuations, ensuring consistent steam output. A water level probe 5 monitors the liquid level in steamer 4 in real time. When the water level falls below the detection threshold, the liquid is heated by passing through water pump 2, preheater 1, and coffee maker 3 before entering steamer 4, allowing it to be refilled with hot water in a timely manner, fundamentally preventing dry-boiling in steamer 4. Furthermore, cold water is preheated in the preheating pot 1 before entering the coffee pot 3, ensuring a stable temperature during continuous coffee brewing or when refilling the steam pot 4. This effectively addresses the slow heating and temperature instability issues of the prior art coffee pot 3 caused by frequent additions of cold water, thereby improving both the refill capacity and the consistency of coffee quality. The overall structure, through the synergistic effect of its components, overcomes the potential for dry-boiling and unstable steam output common in existing coffee machines, enhancing the user experience while ensuring safety.

[0029] The coffee machine with both dry-boiling protection and efficient steam output further includes a pressure relief mechanism, wherein the pressure relief mechanism is provided with a water receiving tray 6, which is fixedly mounted on the body of the coffee machine and is disposed correspondingly to the output end of the pressure relief mechanism. The coffee maker 3 is provided with a first water outlet 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 a threshold value, the first pressure relief and discharge assembly 7 discharges the gas-liquid mixture into the water receiving tray 6.

[0030] The water tray 6 provides a safe liquid drainage area for the entire water system, preventing excess liquid from leaking directly into the machine or the external environment, maintaining a clean operating environment, and reducing the risk of circuit failure caused by liquid leakage. The first water outlet of the coffee maker 3 is connected to the water tray 6 via a first pressure relief and discharge assembly 7. When the air pressure in the connecting pipe between the coffee maker 3 and the steam pot 4 exceeds a threshold, the first pressure relief and discharge assembly 7 promptly discharges the gas-liquid mixture into the water tray 6, effectively preventing the pipe from rupturing or damaging due to excessive pressure. This protects the structural integrity of core components such as the coffee maker 3, the steam pot 4, and the connecting pipes, extending the service life of the machine. Furthermore, this structure does not affect the normal operation of the water circuit. When the coffee maker 3 boils water, excessive heat is generated, resulting in high air pressure in the pipe. The first pressure relief and discharge assembly 7 provides pressure relief protection.

[0031] The first pressure relief and discharge 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.

[0032] The coffee protection valve 12 in the first pressure relief and discharge assembly 7 is a core component for achieving pressure control. It accurately senses changes in air pressure within the pipeline and automatically opens when the air pressure exceeds a preset threshold, safely discharging the gas-liquid mixture into the water collection tray 6, effectively preventing pipeline pressure overload caused by untimely pressure relief. The first connecting tee 13 implements 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, while also allowing for rapid pressure relief through the coffee protection valve 12 in the event of pressure anomalies, ensuring smooth switching of the water system under different operating conditions. This structural design not only ensures continuous water replenishment to the steam pot 4, but also provides dual 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 effects. However, this structure, through the coordinated action of the coffee protection valve 12 and the first connecting tee 13, keeps the pressure within a safe range at all times, thereby ensuring the stability of steam output and the consistency of coffee making quality, while reducing the maintenance cost and failure rate of the machine.

[0033] A steam water inlet solenoid valve 14 is provided on the outer side of the third end of the first connecting tee 13 for switching the on-off state of the pipeline between the coffee maker 3 and the steam pot 4. The third end of the first connecting tee 13, the steam water inlet solenoid valve 14 and the water inlet end of the steam pot 4 are connected in sequence through pipelines.

[0034] The steam inlet solenoid valve 14, located outside the third end of the first connecting tee 13, precisely controls the on / off state of the pipeline between the coffee maker 3 and the steam kettle 4. When the water level probe 5 of the steam kettle 4 detects that the water level is below the detection threshold, the steam inlet solenoid valve 14 promptly opens, allowing hot water from the coffee maker 3 to quickly be replenished into the steam kettle 4, ensuring the continuous and stable operation of the steam kettle 4. When the water level reaches the detection threshold, the steam inlet solenoid valve 14 quickly closes to prevent excessive hot water from being added, which could lead to abnormal pressure in the steam kettle 4. This allows for precise control of the water level and pressure balance in the steam kettle 4. The rapid response of the steam inlet solenoid valve 14 ensures more precise timing for water replenishment in the steam kettle 4, reduces steam pressure fluctuations caused by delayed water replenishment, and ensures that the pressure gauge does not drop significantly during steam output, thereby improving the continuity and stability of steam output. In addition, the provision of the steam inlet solenoid valve 14 makes the water connection between the coffee maker 3 and the steam maker 4 more flexible and controllable. During the operation of the machine, the water connection can be intelligently adjusted according to the actual working conditions (such as making coffee or outputting steam), thereby avoiding mutual interference between the two components and further improving the operating efficiency and reliability of the entire system.

[0035] The steam cooker 4 is provided with a steam output end, and a second pressure relief 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 discharge assembly 8 and the water receiving pan 6 are sequentially connected. When the internal pressure of the steam output pipe of the steam cooker 4 exceeds a threshold value, the second pressure relief discharge assembly 8 discharges the gas-liquid mixture into the water receiving pan 6; The steam cooker 4 is provided with a hot water outlet end, which is independently spaced apart 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 pipelines. The hot water solenoid valve 18 is used to switch the on-off state between the hot water outlet end and the hot water outlet pipe 19.

[0036] The steam output end of the steam cooker 4 is connected to the second pressure relief and discharge assembly 8 and the water receiving tray 6. When the air pressure inside the steam output pipeline exceeds the threshold, the second pressure relief and discharge assembly 8 can discharge the gas-liquid mixture into the water receiving tray 6, effectively preventing excessive steam pressure from damaging the steam cooker 4, the steam output pipe and other components, thereby ensuring the safe operation of the steam output system. The hot water outlet end of the steam cooker 4 is independently arranged and does not interfere with the steam output end. In conjunction 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 influence caused by the shared output channel of hot water and steam in the prior art, and improving the stability and accuracy of the hot water output. The hot water solenoid valve 18 can accurately control the connection and disconnection 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, and improving user convenience. In terms of steam output, since the steam boiler 4 is filled with hot water from the coffee pot 3, combined with the pressure protection of the second pressure relief and discharge assembly 8, the steam output pressure is more stable and lasts longer. In terms of hot water output, because the hot water is heated twice by the preheating pot 1 and the coffee pot 3, the water temperature is stable and the output is controllable, meeting the user's diverse hot water needs. Furthermore, the water tray 6 collects the gas-liquid mixture discharged during pressure relief and any excess liquid output, keeping the machine clean and tidy, reducing maintenance costs, and ensuring that the coffee machine maintains excellent operating conditions in both home and commercial settings.

[0037] The second pressure relief discharge 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. The output end of the steam protection valve 15 is connected to the water receiving tray 6.

[0038] The steam protection valve 15 in the second pressure relief and discharge assembly 8 is specifically designed to control the air pressure of the steam output pipeline. It can accurately set the pressure threshold. When the air pressure inside the steam output pipeline of the steam boiler 4 exceeds the threshold, the steam protection valve 15 opens quickly, which can more effectively protect the safety of the steam output system. The second connecting tee 16 realizes the pipeline diversion between the steam output end, the steam protection valve 15 and the steam output pipe, so that the steam can flow smoothly to the steam output pipe during normal output, and can be safely released through the steam protection valve 15 when the pressure is abnormal, ensuring the continuity and safety of the steam output. This structural design does not affect the normal steam output function, but can quickly activate the protection mechanism when the pressure is abnormal, avoiding the problem of unstable steam output caused by fluctuating or excessive steam pressure. Combined with the design of the steam boiler 4 to replenish hot water, the synergistic effect of the steam protection valve 15 and the second connecting tee 16 further stabilizes the steam output pressure, extends the steam life, and at the same time reduces the risk of machine failure caused by pressure problems, thereby improving the overall reliability and service life of the steam system.

[0039] A steam solenoid valve 11 and a steam output pipe 17 are provided on the outside of the third end of the second connecting tee 16. 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 pipelines. 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.

[0040] The steam solenoid valve 11 and the steam output pipe 17 on the outside of the third end of the second connecting tee 16 cooperate to make the control of steam output 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 requirements. It opens quickly when steam is needed to ensure timely steam output; and closes in time when steam is not needed. The second connecting tee 16 provides a flexible switching channel for the flow of steam, so that steam can be output normally through the steam output pipe 17, and can be discharged to the water receiving tray 6 through the steam protection valve 15 when the pressure exceeds the limit, ensuring the stable operation of the steam system under different working conditions. Compared with the structure without precise control of steam output in the prior art, the setting of the steam solenoid valve 11 makes the timing and duration of steam output controllable, which improves the convenience of user operation; by controlling the switch of the steam solenoid valve 11, the steam output can be cut off when hot water is output alone.

[0041] The coffee maker 3 is provided with a second water outlet for discharging hot coffee water. A liquid receiving and discharging 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 receiving and discharging assembly 9, and the water receiving tray 6 are sequentially connected. Liquid discharged from the second water outlet of the coffee maker 3 is discharged into the water receiving tray 6 through the liquid receiving and discharging assembly 9.

[0042] The liquid receiving and discharging assembly 9 includes a coffee water outlet solenoid valve 20 and a third connecting tee 21. The second water outlet end of the coffee maker 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 output end of the coffee water outlet solenoid valve 20 is connected to the water receiving tray 6.

[0043] The second water outlet of the coffee maker 3 is connected to the water receiving tray 6 via the liquid receiving and discharging assembly 9. The liquid receiving and discharging assembly 9 can promptly discharge the liquid output from the second water outlet of the coffee maker 3 to the water receiving tray 6, preventing the liquid from being discharged into the machine or onto the external surface, keeping the machine clean and hygienic, and reducing the risk of circuit failure or component corrosion caused by liquid leakage. The coffee water outlet solenoid valve 20 and the third connecting tee 21 in the liquid receiving and discharging assembly 9 cooperate to provide more precise control of coffee output. The coffee water outlet solenoid valve 20 controls the connection and disconnection between the second water outlet of the coffee maker 3 and the subsequent pipelines, ensuring precise control of the water output and output timing during coffee making, thereby improving the consistency and quality stability of coffee making. The third connecting tee 21 realizes the diversion of the pipeline for coffee output and excess liquid output collection, allowing normal coffee output to proceed smoothly while directing excess output liquid to the water receiving tray 6, avoiding resource waste and pollution. During the coffee brewing process, the cold water is preheated in the preheating pot 1 before entering the coffee pot 3, maintaining a stable temperature. Combined with the liquid collection function of the liquid receiving and discharging assembly 9, this further stabilizes the temperature and flow of the coffee output. This effectively addresses the existing issues of large temperature fluctuations and slow heating in the coffee pot 3 during continuous coffee brewing, improving the refill capacity and taste consistency of the coffee. Furthermore, the provision of the liquid receiving and discharging assembly 9 does not affect the normal operation of the coffee pot 3, ensuring excellent coffee brewing while enhancing the machine's usability and service life.

[0044] The coffee machine with both dry-boiling protection 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 the water flow signal, the preheating pot 1 is started and heats the cold water.

[0045] Flowmeter 10, located at the input of water pump 2, can detect in real time whether a water flow signal is passing through flowmeter 10. Only when flowmeter 10 detects water flow does preheater 1 start heating cold water. This design fundamentally prevents preheater 1 from drying out when dry, effectively protecting its heating components, extending its service life, and reducing safety hazards caused by dry heating. The provision of flowmeter 10 forms an effective linkage protection mechanism, enhancing system safety. Furthermore, flowmeter 10 ensures that only effective water flow enters preheater 1, making heating in preheater 1 more targeted, avoiding energy waste, and improving energy efficiency. When water pump 2 is delivering cold water, flowmeter 10 detects water flow, prompting preheater 1 to promptly start heating, ensuring effective preheating of the cold water. This provides a stable water source for subsequent secondary heating of coffee pot 3, ensuring that the temperature of coffee pot 3 does not fluctuate significantly when continuously brewing coffee or refilling steam pot 4, thereby improving coffee brewing stability and refill capacity. In addition, the provision of the flow meter 10 makes the operating status of the water system more controllable. By detecting the water flow, it is possible to indirectly determine whether the waterway is unobstructed, which facilitates fault diagnosis of the machine and reduces maintenance costs.

[0046] The water inlet of the flow meter 10 is connected to a water source through a pipeline, such as bottled water, a water tank, or external water (0.1-0.4 MPa).

[0047] The third connecting tee 21 is connected to the coffee pressure gauge 22 through a pipeline.

[0048] The steam cooker 4 is connected to a steam pressure gauge 23 via a pipeline.

[0049] See also Figure 1 When the water pump 2 is running, the bottled water passes through the flow meter 10 and the water pump 2 into the preheating pot 1 for preheating. The preheated liquid enters the coffee pot 3 for heating. When hot water for extracting coffee is needed, the coffee water outlet solenoid valve 20 opens, and the heated liquid in the coffee pot 3 can be output through the coffee water outlet solenoid valve 20 and the third connecting tee 21, so that the hot water is mixed with the coffee powder to form coffee.

[0050] See also Figure 2 When the coffee maker 3 outputs hot water for extracting coffee and the amount of hot water output is too much, the liquid is output to the water receiving tray 6 through the corresponding pipeline.

[0051] See also Figure 3 、 Figure 4 When the hot water output from the coffee maker 3 flows to the steam maker 4 and the air pressure inside the pipeline is too high, the coffee protection valve 12 opens and the gas-liquid mixture is discharged to the water receiving tray 6.

[0052] See also Figure 5When the steam cooker 4 outputs steam and the internal air pressure of the pipeline is too high, the steam protection valve 15 opens and the gas-liquid mixture is discharged to the water receiving tray 6.

[0053] A liquid level detector may also be provided in the coffee pot 3. The preheating pot 1, the coffee pot 3 and the steam pot 4 are all provided with heaters.

[0054] See also Figure 8 A control method for a coffee machine with both dry-boiling protection and efficient steam output is described above. The input end of the water pump 2 is connected to a flow meter 10, and a steam inlet solenoid valve 14 is provided in the pipeline between the coffee pot 3 and the steam pot 4. The control method is as follows: When the coffee machine is started and the water level probe 5 detects that the water level in the steam pot 4 is below the detection threshold, the water pump 2 is started, and the cold water is transported by the water pump 2 to the preheating pot 1 for preheating; the preheated liquid enters the coffee pot 3. When the liquid in the coffee pot 3 is full or reaches a preset liquid threshold, the liquid in the coffee pot 3 enters the steam pot 4 through the steam water inlet solenoid valve 14; if the water level in the steam pot 4 reaches the detection threshold, the steam water inlet solenoid valve 14 is closed, water replenishment is stopped, and the preheating pot 1 does not start heating until the flow meter 10 detects a water flow signal.

[0055] A control method for a coffee machine with both dry-boiling protection and efficient steam output as described above, wherein the steam pot 4 is provided with a steam output end, a second pressure relief discharge assembly 8 is provided between the steam output end and the water receiving tray 6, and the second pressure relief discharge assembly 8 includes a steam protection valve 15; The coffee maker 3 is provided with a second water outlet for outputting hot coffee water. A liquid receiving and discharging assembly 9 is provided between the second water outlet and the water receiving tray 6. The control method thereof is as follows: When the coffee maker 3 and / or the steam maker 4 are heating liquid, if the air pressure in the pipeline is too high, the protection valve of the corresponding pressure relief and discharge assembly opens, and the gas-liquid mixture in the pipeline is discharged to the water receiving tray 6; When the coffee maker 3 outputs hot coffee water, the liquid output from the second water outlet of the coffee maker 3 is discharged to the water receiving tray 6 through the liquid receiving and discharging assembly 9 .

[0056] The water circuit principle of the above coffee machine is as follows: 1. When the machine is powered on for the first time, the water level probe 5 of the steam pot 4 detects a water level signal, and the machine begins to replenish water. Water pump 2 operates to generate suction, and cold water flows through flow meter 10 to water pump 2 and then to preheat pot 1. Only when flow meter 10 detects a water flow signal does preheat pot 1 begin to preheat the cold water. If flow meter 10 does not detect a water flow signal, preheat pot 1 will not operate. After the coffee pot 3 is filled, water flows through the steam inlet solenoid valve 14 into the steam pot 4. When the water level in the steam pot 4 reaches the position detected by the water level probe 5, the machine stops replenishing water. This water path prevents the heating element of the coffee pot 3 from drying out, effectively extending the service life of the heating element. 2. After the machine is preheated, continue to use steam or hot water. When the water level in steam pot 4 falls below the detection point of water level probe 5, the machine begins to refill water. Water pump 2 pumps cold water into preheat pot 1. Preheat pot 1 preheats the cold water and then refills it into coffee pot 3. The hot water in coffee pot 3 is then refilled into steam pot 4 through steam inlet solenoid valve 14. When the water level in steam pot 4 reaches the detection point of water level probe 5, the machine stops refilling water. This water circuit directly refills hot water from the coffee pot into steam pot 4. Compared to refilling with cold water into steam pot 4, this circuit prevents the pressure gauge from returning to zero during steam refill and allows for faster steam heating.

[0057] 3. When making coffee, cold water is preheated in the preheating pot 1 before being added to the coffee pot 3. Compared to adding cold water directly to the coffee pot 3, this effectively solves the problems of temperature instability and slow heating of the coffee pot 3 caused by continuous coffee making or water refilling of the steam pot 4. It effectively improves the temperature stability of the coffee pot 3 and increases the number of refills. This technical solution can be widely used in the field of semi-automatic coffee machines for both home and commercial use. This water circuit solves three major difficulties in the industry and has the advantages of low cost, dry-burn prevention of the heating tube, fast steam heating, and stable coffee temperature.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coffee machine with both dry-burn prevention and efficient steam output, characterized in that: include: A water inlet mechanism, wherein a water pump (2) and a preheating pot (1) are provided on the water inlet mechanism, and an output end of the water pump (2) is connected to the preheating pot (1); A hot water output mechanism, wherein the hot water output mechanism is provided with a coffee pot (3), and the coffee pot (3) is connected to the preheating pot (1); A steam output mechanism is provided on the steam output mechanism, wherein the steam output mechanism is provided with a steam pot (4), the steam pot (4) is connected to the coffee pot (3), and a water level probe (5) for detecting the position of the liquid is provided on the steam pot (4). 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 a detection threshold of the water level probe (5), the water replenishment mechanism is activated, and 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 with water.

2. The coffee machine with both dry-boiling protection and efficient steam output according to claim 1, characterized in that: It also includes a pressure relief mechanism, wherein the pressure relief mechanism is provided with a water receiving tray (6); The coffee pot (3) is provided with a first water outlet end connected to the steam pot (4), and a first pressure relief discharge assembly (7) is provided between the first water outlet end and the water receiving tray (6). The first water outlet end of the coffee pot (3), the first pressure relief 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 pot (3) and the steam pot (4) exceeds a threshold value, the first pressure relief discharge assembly (7) discharges the gas-liquid mixture onto the water receiving tray (6); The first pressure relief discharge 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 in communication with the water receiving tray (6).

3. The coffee machine with both dry-boiling protection and efficient steam output according to claim 2, characterized in that: A steam water inlet solenoid valve (14) for switching the on / off state of the pipeline between the coffee pot (3) and the steam pot (4) is provided on the outer side of the third end of the first connecting tee (13), and the third end of the first connecting tee (13), the steam water inlet solenoid valve (14) and the water inlet end of the steam pot (4) are connected in sequence via pipelines.

4. The coffee machine with both dry-boiling protection and efficient steam output according to claim 2, characterized in that: The steam cooker (4) is provided with a steam output end, and a second pressure relief discharge assembly (8) is provided between the steam output end and the water receiving tray (6). The steam output end of the steam cooker (4), the second pressure relief discharge assembly (8) and the water receiving tray (6) are sequentially connected. When the internal air pressure of the steam output pipeline of the steam cooker (4) exceeds a threshold value, the second pressure relief discharge assembly (8) discharges the gas-liquid mixture onto the water receiving tray (6); The steam cooker (4) is provided with a hot water outlet end, the hot water outlet end and the steam output end are independently 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 end, the hot water outlet end, the hot water solenoid valve (18) and the hot water outlet pipe (19) are connected in sequence through pipelines, and the hot water solenoid valve (18) is used to switch the on / off state between the hot water outlet end and the hot water outlet pipe (19); The second pressure relief discharge assembly (8) includes a steam protection valve (15) and a second connecting tee (16); the steam pot (4) is provided with a steam output end, the steam output end is connected to the first end of the second connecting tee (16); the steam protection valve (15) input end is connected to the second end of the second connecting tee (16); and the steam protection valve (15) output end is connected to the water receiving tray (6).

5. The coffee machine with both dry-boiling protection and efficient steam output according to claim 4, characterized in that: A steam solenoid valve (11) and a steam output pipe (17) are provided on the outer side of the third end of the second connecting tee (16). The third end of the second connecting tee (16), the steam solenoid valve (11) and the steam output pipe (17) are sequentially connected via pipelines. 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).

6. The coffee machine with both dry-boiling protection and efficient steam output according to claim 2, characterized in that: The coffee pot (3) is provided with a second water outlet for outputting hot coffee water, and a liquid receiving and discharging assembly (9) is provided between the second water outlet and the water receiving tray (6). The second water outlet of the coffee pot (3), the liquid receiving and discharging assembly (9) and the water receiving tray (6) are sequentially connected, and the liquid output from the second water outlet of the coffee pot (3) is discharged to the water receiving tray (6) through the liquid receiving and discharging assembly (9).

7. The coffee machine with both dry-boiling protection and efficient steam output according to claim 6, characterized in that: The liquid receiving and discharging assembly (9) comprises a coffee water outlet solenoid valve (20) and a third connecting tee (21); the second water outlet end 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 output end of the coffee water outlet solenoid valve (20) is connected to the water receiving tray (6).

8. The coffee machine with both dry-boiling protection and efficient steam output according to claim 1, 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 the presence of a water flow signal, the preheating pot (1) starts and heats the cold water.

9. A method for controlling a coffee machine with both dry-boiling prevention and efficient steam output as claimed in claim 1, characterized in that: The input end of the water pump (2) is connected to a flow meter (10), and a steam inlet solenoid valve (14) is provided on the pipeline between the coffee pot (3) and the steam pot (4). The control method thereof is as follows: The coffee machine is started, and when the water level probe (5) detects that the water level in the steam pot (4) is lower than the detection threshold, the water pump (2) is started, and cold water is transported by the water pump (2) to the preheating pot (1) for preheating; the preheated liquid enters the coffee pot (3), and when the liquid in the coffee pot (3) is in a full load state or reaches a preset liquid threshold state, the liquid in the coffee pot (3) enters the steam pot (4) through the steam water inlet solenoid valve (14); if the water level in the steam pot (4) reaches the detection threshold, the steam water inlet solenoid valve (14) is closed, and water replenishment is stopped, and the preheating pot (1) starts heating only after the flow meter (10) detects a water flow signal.

10. A control method for a coffee machine with both dry-boiling prevention and efficient steam output as claimed in claim 2, characterized in that: The steam cooker (4) is provided with a steam output end, and a second pressure relief discharge assembly (8) is provided between the steam output end and the water receiving tray (6), and the second pressure relief discharge assembly (8) includes a steam protection valve (15); The coffee pot (3) is provided with a second water outlet for outputting hot coffee water, and a liquid receiving and discharging assembly (9) is provided between the second water outlet and the water receiving tray (6). The control method thereof is as follows: When the coffee maker (3) and / or the steam maker (4) are heating liquid, if the air pressure in the pipeline is too high, the protective valve of the corresponding pressure relief discharge assembly opens, and the gas-liquid mixture in the pipeline is discharged to the water receiving tray (6); When the coffee pot (3) outputs hot coffee water, the liquid output from the second water outlet of the coffee pot (3) is discharged onto the water receiving tray (6) through the liquid receiving and discharging assembly (9).

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