Capsule coffee machine with improved heating structure

Abstract

This invention discloses an improved heating structure capsule coffee machine, including a shell and a control device, water tank, boiler, extraction mechanism, and at least one water pump installed within the shell. The boiler is connected to the extraction mechanism, and the water pump is connected in series between the boiler and the extraction mechanism. The water tank includes a body, a top cover, and a water injection and pressure relief valve. A water inlet is provided at the bottom of the body and is connected to the boiler. The water injection and pressure relief valve includes a valve body, a sealing valve core, a return spring, and a water injection and pressure relief rod. The water injection and pressure relief rod is slidably installed on the valve body, and the sealing valve core is sleeved on the water injection and pressure relief rod. The upper end of the water injection and pressure relief rod abuts against the top cover. A slag discharge pipe is provided at the bottom of the boiler, and a slag discharge filter assembly is provided on the slag discharge pipe. The water injection and pressure relief valve simultaneously handles water inlet and outlet and pressure relief, has a simple structure, and is low in cost. The heating element is suspended, reducing the sealing surface at the bottom of the boiler and lowering the risk of leakage. Scale and impurities are removed by disassembling the slag discharge filter assembly, preventing the accumulation of scale and impurities.

Description

Technical Field

[0001] This invention relates to the field of coffee machine technology, and in particular to a capsule coffee machine with an improved heating structure. Background Technology

[0002] A capsule coffee machine is a machine used to extract capsule coffee. Before extraction, the water needs to be heated. The heating structure of capsule coffee machines is mainly divided into storage type and instant type. The storage type heating structure can heat the water to a higher temperature, with high water pressure and flow rate, while the instant type heats up quickly without waiting, but with low water pressure and flow rate. However, in the existing technology, the heating tubes used in the storage type heating mechanism have both ends protruding from the bottom or side of the boiler. This results in a large sealing surface at the bottom and side of the boiler, and the sealing surface is below the water level. Once a leak occurs, it can easily burn out the capsule coffee machine, or even cause electric shock and other dangers, resulting in poor safety and reliability. Furthermore, during the water heating process, a large pressure is generated inside the boiler. In the existing technology, the boiler and water tank need to be connected by pipelines, and the pressure inside the boiler needs to be released into the water tank through an exhaust valve. This structure is complex and costly. If the exhaust valve fails, there is a risk of explosion, resulting in poor reliability and stability.

[0003] On the other hand, existing capsule coffee machines require the use of purified water. If tap water or spring water is used, scale and other impurities will be generated in the boiler. Over time, these impurities will clog the pump, valves and pipes, causing damage to the capsule coffee machine. The machine has high usage requirements and a high failure rate, so it is necessary to improve it. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a capsule coffee machine with an improved heating structure. This machine has a simple structure, low cost, reduced risk of leakage, improved reliability and stability, increased safety, and can filter and remove scale and impurities from the boiler.

[0005] To achieve the above objectives, the technical solution adopted by this invention is as follows: a capsule coffee machine with an improved heating structure, comprising a housing and a control device, a water tank, a boiler, an extraction mechanism, and at least one water pump installed within the housing. The control device is electrically connected to the water pump, the water tank is connected to the boiler, the boiler is connected to the extraction mechanism, and the water pump is connected in series between the boiler and the extraction mechanism. The water tank includes a housing, a top cover, and a water inlet / pressure relief valve. A water inlet is provided at the lower part of the housing and is connected to the boiler. The top cover is hinged to one side of the housing or the outer casing, and the water inlet / pressure relief valve is located at the water inlet.

[0006] The water injection pressure relief valve includes a valve body, a sealing valve core, a return spring, and a water injection pressure relief rod. The valve body is embedded in the water injection port. The upper part of the valve body is provided with a water inlet and the lower part is provided with a water outlet. The water inlet communicates with the interior of the water tank, and the water outlet communicates with the interior of the boiler. The lower part of the water injection pressure relief rod is slidably installed on the valve body. The sealing valve core is sleeved on the lower part of the water injection pressure relief rod and located in the valve body. The return spring is located below the sealing valve core. The interior of the water injection pressure relief rod is hollow. The lower end of the water injection pressure relief rod is provided with an air inlet that communicates with the inner cavity of the boiler. The upper end of the water injection pressure relief rod extends to the upper part of the housing and abuts against the top cover. At least one air vent is provided on one side of the upper part of the water injection pressure relief rod.

[0007] The boiler is equipped with a water level sensing mechanism, a temperature sensing mechanism, and a heating element. The two ends of the heating element extend out of the upper end face of the boiler and are electrically connected to the control device. There is a heating gap between the heating element and the inner wall of the boiler. The water level sensing mechanism and the temperature sensing mechanism are electrically connected to the control device.

[0008] The boiler is equipped with a slag discharge pipe at the bottom, the upper part of which is connected to the boiler. The lower part of the slag discharge pipe is equipped with a slag discharge port, and the side of the slag discharge pipe is equipped with a drain outlet, which is connected to a water pump. The slag discharge pipe is equipped with a slag discharge filter assembly, which includes a slag discharge valve and a filter screen. The filter screen is located at the upper end of the slag discharge valve and above the drain outlet. The upper part of the slag discharge valve is inserted into the slag discharge port, and the lower part of the slag discharge valve is fixedly connected to the lower end of the slag discharge pipe and seals the slag discharge pipe.

[0009] In a further technical solution, the slag discharge valve includes a slag discharge cap, a slag discharge valve core, a first sealing ring, and connecting screws. The slag discharge cap is provided with an annular first drainage mounting groove and a second drainage mounting groove with the opening facing upwards. The second drainage mounting groove is located inside the first drainage mounting groove.

[0010] The inner wall of the first drainage installation groove is provided with a lower connecting clip or a lower connecting thread, and the outer side of the lower end of the corresponding slag discharge pipe is provided with an upper connecting clip or an upper connecting thread. The upper connecting clip and the lower connecting clip are engaged, or the upper connecting thread and the lower connecting thread are threaded together. The first sealing ring is set between the slag discharge cap and the slag discharge pipe.

[0011] The slag discharge valve core is installed in the second drainage installation groove, and the filter screen is installed at the upper end of the slag discharge valve core. The center of the slag discharge cap has a sealing installation hole that penetrates the slag discharge cap, and the center of the slag discharge valve core has a through rod hole that penetrates the slag discharge valve core. The sealing installation hole and the through rod hole are aligned vertically. The connecting screws pass through the sealing installation hole and the through rod hole from bottom to top and are threaded to the filter screen.

[0012] In a further technical solution, the filter screen includes a filter frame with a "T" shaped cross-section and a stainless steel filter screen that is fitted onto the upper part of the filter frame. The stainless steel filter screen has multiple filter holes. The lower part of the filter frame is inserted into the through-rod hole. The connecting screw is threadedly connected to the filter frame. A second sealing ring is provided between the filter frame and the slag discharge valve core, and a third sealing ring is provided between the slag discharge valve core and the slag discharge pipe.

[0013] In a further technical solution, the slag discharge filter assembly is also equipped with an anti-loss connector. One end of the anti-loss connector is fixedly installed at the bottom of the outer shell, and the other end of the anti-loss connector is fitted onto the slag discharge cap.

[0014] The upper end of the slag discharge pipe is covered with a buffer cover, and the side of the buffer cover is provided with multiple guide ports spaced apart along the circumference.

[0015] In a further technical solution, the heating element includes two straight segments and one spiral segment. The two straight segments are vertically spaced apart, and the two ends of the spiral segment are connected to the lower ends of the two straight segments respectively. The upper ends of the two straight segments are electrically connected to the control device respectively.

[0016] A temperature control fuse is inserted in the center of the spiral section. The temperature control fuse includes a fuse housing and two temperature fuse tubes. The two temperature fuse tubes are respectively located inside the fuse housing and are connected in series between the two straight sections and the control device. The lower end of the fuse housing is fixedly installed in the boiler, and the upper end extends into the center of the spiral section.

[0017] In a further technical solution, the temperature sensing mechanism includes an NTC sensor and a temperature-sensing metal housing. The NTC sensor is fixedly installed inside the temperature-sensing metal housing, which is fixedly installed at the bottom of the boiler and extends into the interior of the boiler. The NTC sensor is electrically connected to the control device.

[0018] The water level sensing mechanism includes a first water level connecting line, a second water level connecting line, and a water level sensing probe. One end of the first water level connecting line is electrically connected to the temperature sensing metal housing, and the other end is electrically connected to the control device. The upper part of the water level sensing probe is fixedly installed on the upper part of the boiler, and the lower part of the water level sensing probe extends into the interior of the boiler. The lower end of the water level sensing probe is located above the spiral section. One end of the second water level connecting line is electrically connected to the upper end of the water level sensing probe, and the other end is electrically connected to the control device.

[0019] In a further technical solution, the boiler includes a boiler body and a boiler cover. The boiler cover is sealed and installed on the upper part of the boiler body. The heating element and the water level sensing mechanism are fixedly installed on the boiler cover. The temperature sensing mechanism and the temperature control safety mechanism are both located on the lower part of the boiler body.

[0020] The valve body includes an upper shell and a lower shell. The upper shell is snapped to the upper part of the lower shell. The water inlet is located on the upper part of the upper shell. A sliding column extends downward from the center of the lower shell. A sliding hole is provided in the center of the sliding column. The lower part of the water injection and pressure relief rod passes through the water inlet and is slidably installed in the sliding hole. The diameter of the water inlet is larger than the diameter of the water injection and pressure relief rod. Multiple water outlets are provided around the periphery of the sliding column.

[0021] In a further technical solution, the sealing valve core uses a soft rubber ring, the inner ring of the sealing valve core has an annular mounting groove, the lower outer side of the water injection pressure relief rod is provided with an annular mounting platform, the annular mounting groove and the annular mounting platform are snap-fit ​​connected, the outer edge of the upper end face of the sealing valve core is provided with an upwardly protruding sealing ring, the diameter of the sealing ring is larger than the diameter of the water inlet hole, the upper end of the return spring abuts against the sealing valve core or the annular mounting platform, and the lower end abuts against the lower shell;

[0022] At least one limiting strip and a limiting block are also provided on the outer side of the lower part of the water injection pressure relief rod. The limiting strip is located above the annular mounting platform, and the limiting block is located above the upper shell. The upper shell is provided with a limiting groove. The limiting strip and the limiting groove are mutually limiting and engaged, and the limiting block and the upper shell are mutually limiting and engaged.

[0023] In a further technical solution, the sliding column is fitted with a splash guard, the lower part of which gradually extends outward from top to bottom to form a horn-shaped splash guard, and the diameter of the lower end of the splash guard is greater than or equal to the diameter of the lower shell.

[0024] In a further technical solution, the water tank or outer shell is equipped with a cover-closing sensor for detecting the opening and closing of the cover, and the cover-closing sensor is electrically connected to the control device.

[0025] The extraction mechanism includes an extraction cup for holding the coffee capsule and a water injection needle for piercing the coffee capsule packaging and injecting water into it. The lower part of the extraction cup has a liquid outlet, and a piercing needle extending upwards into the extraction cup is located beside the liquid outlet.

[0026] The upper part of the outer shell is provided with an installation chamber, and the installation chamber is provided with an inner shell. The box body is formed at the rear of the inner shell, and the extraction cup is formed at the front of the inner shell. The rear side of the top cover is hinged to the rear of the inner shell or the outer shell, and the top cover closes to the installation chamber.

[0027] The water injection needle is located on the top cover and above the extraction cup. An upper connecting pipe is located in the middle of the top cover, and a lower connecting pipe is located in the middle of the inner shell. The upper end of the upper connecting pipe is connected to the upper end of the water injection needle through an upper connecting line. The lower end of the upper connecting pipe is movably connected to the upper end of the lower connecting pipe. The lower end of the lower connecting pipe is connected to the drain outlet through a lower connecting line. A water pump is located on the lower connecting line.

[0028] The advantages of this invention compared to existing technologies, based on the above structure, are as follows: When water is injected into the water tank by opening the top cover, the water injection pressure relief valve is closed. Closing the top cover opens the valve, allowing water from the tank to be injected into the boiler. Water is not directly injected into the boiler before the top cover is closed, preventing steam from splashing out of the tank when the boiler temperature is high, thus improving safety. During boiling, steam generated in the boiler is discharged into the water tank through the pressure relief valve's rod, thus relieving pressure on the boiler and preventing excessive pressure, further enhancing safety. The pressure relief valve simultaneously handles water inlet / outlet and pressure relief functions, is simple in structure, low in cost, eliminates the need for a separate pressure relief valve, and offers high reliability. Both ends of the heating element extend from the top of the boiler and are electrically connected to the control device. The heating element is suspended, reducing the sealing surface at the bottom of the boiler, lowering the risk of leakage, and improving reliability and stability. The slag removal filter assembly removes scale and impurities from inside the boiler, preventing their accumulation. Spring water can be used for extraction, improving taste and flavor, and reducing water quality requirements. A filter screen filters water before it enters the pipes and pumps, preventing scale and impurities from entering and causing blockages, thus improving reliability and stability. Two thermal fuses are connected in series at each end of the heating element; when the temperature exceeds a threshold, either fuse trips to cut off power, providing double protection. This, combined with a water injection pressure relief valve and a water level sensor, forms a multi-layered safety protection mechanism, further enhancing safety and reliability. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a connection diagram of the present invention.

[0032] Figure 3 It is a cross-sectional view of the invention;

[0033] Figure 4 This is a schematic diagram of the internal structure of the outer casing of the present invention;

[0034] Figure 5 This is an exploded view of the boiler of the present invention;

[0035] Figure 6 This is a partial cross-sectional view of the boiler of the present invention;

[0036] Figure 7 This is an exploded view of the slag discharge and filtration assembly of the present invention;

[0037] Figure 8 This is an exploded view of the water injection pressure relief valve of the present invention;

[0038] Figure 9 This is a cross-sectional view of the water injection pressure relief valve of the present invention when it is closed;

[0039] Figure 10 This is a cross-sectional view of the water injection pressure relief valve of the present invention when it is open;

[0040] In the picture:

[0041] 1. Outer shell, 11. Inner shell, 12. Lower connecting pipe fittings, 13. Water pump, 14. Lower connecting pipeline;

[0042] 2. Water tank; 21. Tank body; 22. Top cover; 23. Upper connecting fittings; 24. Upper connecting pipelines;

[0043] 3. Water injection pressure relief valve, 31. Valve body, 311. Upper shell, 312. Water inlet, 313. Limiting groove, 314. Lower shell, 315. Water outlet, 316. Sliding column, 317. Sliding hole, 32. Sealing valve core, 321. Annular mounting groove, 322. Sealing ring, 33. Return spring, 34. Water injection pressure relief rod, 341. Air inlet, 342. Exhaust port, 343. Annular mounting platform, 344. Limiting strip, 345. Limiting block, 35. Splash guard;

[0044] 4. Boiler; 41. Furnace body; 42. Furnace cover;

[0045] 51 First water level connection line, 52 Second water level connection line, 53 Water level sensing probe;

[0046] 6. Temperature sensing mechanism; 61. NTC sensor; 62. Temperature-sensing metal housing;

[0047] 7 Heating element, 71 Straight section, 72 Spiral section, 73 Fuse housing, 74 Temperature fuse;

[0048] 8. Slag discharge pipe, 81. Slag discharge port, 82. Drainage port, 83. Connecting screw, 84. Slag discharge filter assembly, 841. Slag discharge cap, 8411. First drainage installation groove, 8412. Second drainage installation groove, 8413. Sealing installation hole, 842. Slag discharge valve core, 8421. Through rod hole, 843. Connecting screw, 844. Second sealing ring, 845. Third sealing ring, 846. Filter frame, 847. Stainless steel filter screen, 848. Filter hole, 849. Anti-loss connector, 85. First sealing ring, 86. Buffer cover, 861. Guide port;

[0049] 9 Extraction mechanism, 91 Extraction cup, 92 Liquid outlet, 93 Needle, 94 Water injection needle. Detailed Implementation

[0050] The following are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

[0051] A capsule coffee machine with an improved heating structure, such as Figures 1 to 10As shown, the system includes a housing 1 and a control device installed within the housing 1, a water tank 2, a boiler 4, an extraction mechanism 9, and at least one water pump 13. The control device is electrically connected to the water pump 13. The water tank 2 is connected to the boiler 4, and the boiler 4 is connected to the extraction mechanism 9. The water pump 13 is connected in series between the boiler 4 and the extraction mechanism 9. The water tank 2 includes a tank body 21, a top cover 22, and a water injection and pressure relief valve 3. A water inlet is provided at the lower part of the tank body 21 and is connected to the boiler 4. The top cover 22 is hinged to one side of the tank body 21 or the housing 1. The water injection and pressure relief valve 3 is located at the water inlet. The water injection and pressure relief valve 3 includes... The system includes a valve body 31, a sealing valve core 32, a return spring 33, and a water injection pressure relief rod 34. The valve body 31 is embedded in the water inlet. The upper part of the valve body 31 has a water inlet 312, and the lower part has a water outlet 315. The water inlet 312 communicates with the interior of the water tank 2, and the water outlet 315 communicates with the interior of the boiler 4. The lower part of the water injection pressure relief rod 34 is slidably mounted on the valve body 31. The sealing valve core 32 is sleeved on the lower part of the water injection pressure relief rod 34 and located inside the valve body 31. The return spring 33 is located below the sealing valve core 32. The interior of the water injection pressure relief rod 34 is hollow. The lower end of the water pressure relief rod 34 is provided with an air inlet 341, which communicates with the inner cavity of the boiler 4. The upper end of the water pressure relief rod 34 extends to the upper part of the housing 21 and abuts against the upper cover 22. At least one exhaust port 342 is provided on one side of the upper part of the water pressure relief rod 34. The boiler 4 is equipped with a water level sensing mechanism, a temperature sensing mechanism 6, and a heating element 7. Both ends of the heating element 7 extend out of the upper end face of the boiler 4 and are electrically connected to the control device. There is a heating gap between the heating element 7 and the inner wall of the boiler 4. The water level sensing mechanism and the temperature sensing mechanism are also included. 6 are electrically connected to the control device respectively; the lower part of the boiler 4 is provided with a slag discharge pipe 8, the upper part of the slag discharge pipe 8 is connected to the boiler 4, the lower part of the slag discharge pipe 8 is provided with a slag discharge port 81, the side of the slag discharge pipe 8 is provided with a drain port 82, the drain port 82 is connected to the water pump 13, the slag discharge pipe 8 is provided with a slag discharge filter assembly 84, the slag discharge filter assembly 84 includes a slag discharge valve and a filter screen, the filter screen is provided at the upper end of the slag discharge valve and located above the drain port 82, the upper part of the slag discharge valve is inserted into the slag discharge port 81, and the lower part of the slag discharge valve is snapped to the lower end of the slag discharge pipe 8.

[0052] Traditional capsule coffee machines cannot remove impurities from the boiler 4. To reduce scale buildup, purified water is often used for extraction, making capsule coffee machines highly sensitive to water quality and unable to use spring water, thus hindering the production of optimal-tasting beverages. Furthermore, the traditional heating element 7 is installed at the bottom or side of the boiler 4, placing its sealing surface below the water level, increasing the risk of leakage. Additionally, the boiler 4 requires additional connections to a pressure relief valve and a water injection valve, resulting in a complex and costly structure. In contrast, this invention, when the top cover 22 is opened to inject water into the water tank 2, keeps the water injection pressure relief valve 3 closed. Closing the top cover 22 opens the water injection pressure relief valve 3, allowing water from the water tank 2 to be injected into the boiler 4. Before closing the top cover 22, water is not directly injected into the boiler 4, preventing steam from splashing out of the water tank 2 when the boiler 4 is hot, thus improving safety. During boiling, steam generated inside the boiler 4 is released through the water injection pressure relief valve 3. The pressure relief rod 34 is discharged into the water tank 2, thereby relieving pressure on the boiler 4, preventing excessive pressure on the boiler 4, and improving safety. The water injection pressure relief valve 3 simultaneously serves as both water inlet / outlet and pressure relief functions, with a simple structure, low cost, and high reliability as it eliminates the need for a separate pressure relief valve. The two ends of the heating element 7 extend from the top of the boiler 4 and are electrically connected to the control device, allowing the heating element 7 to be suspended, reducing the sealing surface at the bottom of the boiler 4, lowering the risk of leakage, and improving reliability and stability. By disassembling the slag discharge filter assembly 84, scale and impurities inside the boiler 4 are removed, preventing scale and impurities from accumulating. Spring water can be used for extraction, improving taste and flavor, and reducing the requirements for water quality. The filter screen filters water before it enters the pipes and water pump 13, preventing scale and impurities from entering the pipes and water pump 13, preventing blockage, and improving reliability and stability. The water injection pressure relief valve 3 and the water level sensing mechanism form a multi-layered safety protection mechanism, further improving safety and reliability.

[0053] Specifically, such as Figure 6 and 7As shown, the slag discharge valve includes a slag discharge cap 841, a slag discharge valve core 842, a first sealing ring 85, and a connecting screw 843. The slag discharge cap 841 is provided with an upward-facing annular first drainage mounting groove 8411 and a second drainage mounting groove 8412. The second drainage mounting groove 8412 is located inside the first drainage mounting groove 8411. The inner wall of the first drainage mounting groove 8411 is provided with a lower connecting buckle or a lower connecting thread. The outer side of the lower end of the corresponding slag discharge pipe 8 is provided with an upper connecting buckle or an upper connecting thread. The upper connecting buckle engages with the lower connecting buckle or the upper connecting thread engages with the lower connecting thread. The first sealing ring 85 is disposed between the slag discharge cap 841 and the slag discharge pipe 8. The slag discharge valve core 842 is disposed in the second drainage installation groove 8412. The filter screen is disposed at the upper end of the slag discharge valve core 842. The center of the slag discharge cap 841 is provided with a sealing installation hole 8413 that penetrates the slag discharge cap 841. The center of the slag discharge valve core 842 is provided with a rod hole 8421 that penetrates the slag discharge valve core 842. The sealing installation hole 8413 and the rod hole 8421 are aligned vertically. The connecting screw 843 passes through the sealing installation hole 8413 and the rod hole 8421 from bottom to top and is threadedly connected to the filter screen. The slag discharge cap 841 is used to connect to the slag discharge pipe 8 by means of threads or snaps, thereby sealing the slag discharge pipe 8 to prevent water leakage during use. The connection by threads or snaps is convenient for disassembly and waterproof slag discharge, and is easy to use. The filter screen is connected to the slag discharge valve core 842 to increase the vertical height of the filter screen so that the filter screen is located above the drain outlet 82. The filter screen is fixed by the connecting screw 843, which facilitates subsequent disassembly, cleaning or replacement.

[0054] Specifically, the filter screen includes a filter frame 846 with a "T"-shaped cross-section and a stainless steel filter screen 847 that is injection molded onto the upper part of the filter frame 846. The stainless steel filter screen 847 has multiple filter holes 848. The lower part of the filter frame 846 is inserted into the through hole 8421. The connecting screw 843 is threadedly connected to the filter frame 846. A second sealing ring 844 is provided between the filter frame 846 and the slag discharge valve core 842, and a third sealing ring 845 is provided between the slag discharge valve core 842 and the slag discharge pipe 8. The filter frame 846 and the stainless steel filter screen 847 are injection molded into one piece through an injection molding process. The stainless steel filter screen 847 has high structural strength, denser filter holes 848, and strong filtration capacity. The filter frame 846 is used to connect the connecting screw 843. The structure is simple and the cost is low. The second sealing ring 844 is used to seal the gap between the slag discharge valve core 842 and the filter frame 846, preventing water from flowing out from the sealing mounting hole 8413 and the rod through hole 8421, thus preventing water seepage. The third sealing ring 845 is sleeved on the slag discharge valve core 842, thereby sealing the gap between the slag discharge valve core 842 and the slag discharge pipe 8, and forming a double seal with the first sealing ring 85, further preventing water leakage and improving reliability and stability.

[0055] Specifically, the ash removal filter assembly 84 is also equipped with an anti-loss connector 849. One end of the anti-loss connector 849 is fixedly installed at the bottom of the outer casing 1, and the other end is fitted onto the ash removal cap 841. The upper end of the ash removal pipe 8 is covered with a buffer cover 86, and the side of the buffer cover 86 is provided with multiple guide ports 861 spaced apart along the circumferential direction. The anti-loss connector 849 is made of rubber. After the ash removal filter assembly 84 is disassembled, it remains connected to the outer casing 1, preventing the ash removal filter assembly 84 from being lost. Furthermore, after the ash removal filter assembly 84 is disassembled, due to the connection of the anti-loss connector 849, the ash removal filter assembly 84 is always located below the outer casing 1, preventing the capsule coffee machine from being placed on a flat surface. This reminds the user to install the ash removal filter assembly 84 during use, improving reliability and stability. The end of the anti-loss connector 849 is provided with a ring, which is fitted onto the slag discharge cap 841. The slag discharge cap 841 can rotate relative to the ring, thereby facilitating the disassembly and assembly of the slag discharge filter assembly 84. The buffer cover 86 reduces the impact of water flow on the stainless steel filter screen 847, preventing the stainless steel filter screen 847 from being deformed by the water flow and thus reducing its filtration capacity, further improving reliability and stability.

[0056] Specifically, such as Figure 5 As shown, the heating element 7 includes two straight segments 71 and one spiral segment 72. The two straight segments 71 are vertically spaced apart. The two ends of the spiral segment 72 are connected to the lower ends of the two straight segments 71 respectively. The upper ends of the two straight segments 71 are electrically connected to the control device respectively. A temperature control fuse mechanism is inserted in the center of the spiral segment 72. The temperature control fuse mechanism includes a fuse housing 73 and two temperature fuse tubes 74. The two temperature fuse tubes 74 are respectively disposed inside the fuse housing 73 and are connected in series between the two straight segments 71 and the control device. The lower end of the fuse housing 73 is fixedly installed on the boiler 4, and the upper end extends into the center of the spiral segment 72.

[0057] Two straight segments 71 are connected to the neutral and live wires respectively, and two thermal fuses 74 are connected in series with the two straight segments 71 respectively. When the temperature exceeds the threshold, either thermal fuse 74 will disconnect to complete the power outage, forming a double insurance. Even if one thermal fuse 74 fails, the other thermal fuse 74 can still provide maximum temperature fuse protection, improving safety and reliability. Since the heating element 7 is the heat source, and the spiral segment 72 is the heat source with the highest temperature, the thermal fuse 74 is set in the center of the spiral segment 72 through the fuse housing 73, so that the thermal fuse 74 can accurately detect the highest temperature in the boiler 4 at close range, and perform fuse protection based on the highest temperature, further improving safety.

[0058] Specifically, the temperature sensing mechanism 6 includes an NTC sensor 61 and a temperature-sensing metal housing 62. The NTC sensor 61 is fixedly installed inside the temperature-sensing metal housing 62, which is fixedly installed at the lower part of the boiler 4 and extends into the interior of the boiler 4. The NTC sensor 61 is electrically connected to the control device. The water level sensing mechanism includes a first water level connecting line 51, a second water level connecting line 52, and a water level sensing probe 53. One end of the first water level connecting line 51 is electrically connected to the temperature-sensing metal housing 62, and the other end is electrically connected to the control device. The upper part of the water level sensing probe 53 is fixedly installed at the upper part of the boiler 4, and the lower part of the water level sensing probe 53 extends into the interior of the boiler 4. The lower end of the water level sensing probe 53 is located above the spiral section 72. One end of the second water level connecting line 52 is electrically connected to the upper end of the water level sensing probe 53, and the other end is electrically connected to the control device. The NTC sensor 61 is installed at the bottom of the boiler 4 via a temperature-sensing metal housing 62. The NTC sensor 61 monitors the water temperature inside the boiler 4 in real time, thereby intelligently adjusting the power of the heating element 7 to improve heating efficiency and reduce energy consumption. When water is added to the boiler 4, the water first touches the temperature-sensing metal housing 62. As the water level in the boiler 4 gradually rises, the water gradually contacts the lower end of the water level sensing probe 53. Utilizing the conductivity of water, the temperature-sensing metal housing 62 and the water level sensing probe 53 act as two electrodes. Through the principle of an oscillating circuit, using water as the connecting medium between the two electrodes, it detects whether the water level inside the boiler 4 is above the spiral section 72 of the heating element 7. This prevents the water level from falling below the spiral section 72, which could lead to dry burning and improve safety. Using the temperature-sensing metal housing 62 as an electrode simplifies the structure and reduces costs.

[0059] Specifically, such as Figure 5As shown, the boiler 4 includes a boiler body 41 and a boiler cover 42. The boiler cover 42 is sealed and installed on the upper part of the boiler body 41. The heating tube 7 and the water level sensing mechanism are fixedly installed on the boiler cover 42. The temperature sensing mechanism 6 is located on the lower part of the boiler body 41. The valve body 31 includes an upper shell 311 and a lower shell 314. The upper shell 311 is snapped to the upper part of the lower shell 314. The water inlet 312 is opened on the upper part of the upper shell 311. A sliding column 316 extends downward from the center of the lower shell 314. A sliding hole 317 is opened in the center of the sliding column 316. The lower part of the water injection and pressure relief rod 34 passes through the water inlet 312 and is slidably installed in the sliding hole 317. The diameter of the water inlet 312 is larger than the diameter of the water injection and pressure relief rod 34. Multiple water outlet holes 315 are opened on the periphery of the sliding column 316. The furnace cover 42 is fixedly connected to the furnace body 41 with screws, and then the furnace cover 42 is connected to the water tank 2 with screws. The connection structure is simple and reliable. A sealing ring is set between the furnace body 41 and the furnace cover 42. During use, the water level will not be higher than the sealing ring, thereby reducing the sealing surface below the water level, reducing the risk of water leakage, and improving reliability and stability. When the water injection pressure relief valve 3 is opened, water enters the interior of the valve body 31 through the gap between the water inlet 312 and the water injection pressure relief rod 34, and finally enters the boiler 4 from each water outlet 315. The lower shell 314 forms a filter screen through multiple water outlets 315 to filter the water and prevent impurities from entering the boiler 4. The upper shell 311 and the lower shell 314 of the valve body 31 are snap-fitted together, which makes it easy to open the valve body 31 for cleaning. The upper shell 311 is fixed to the water inlet by snap-fit, which makes it easy to disassemble and assemble the water injection pressure relief valve 3.

[0060] Specifically, such as Figure 8 As shown, the sealing valve core 32 uses a soft rubber ring. An annular mounting groove 321 is provided on the inner ring of the sealing valve core 32. An annular mounting platform 343 is provided on the outer side of the lower part of the water injection pressure relief rod 34. The annular mounting groove 321 and the annular mounting platform 343 are snap-fitted together. An upwardly protruding sealing ring 322 is provided on the outer edge of the upper end face of the sealing valve core 32. The diameter of the sealing ring 322 is larger than the diameter of the water inlet hole 312. The upper end of the return spring 33 abuts against the sealing valve core 32 or the annular mounting platform 343, and the lower end abuts against the lower shell 314. At least one limiting strip 344 and a limiting block 345 are also provided on the outer side of the lower part of the water injection pressure relief rod 34. The limiting strip 344 is located above the annular mounting platform 343, and the limiting block 345 is located above the upper shell 311. The upper shell 311 is provided with a limiting groove 313. The limiting strip 344 and the limiting groove 313 are mutually limitingly engaged, and the limiting block 345 and the upper shell 311 are mutually limitingly engaged. Figure 10 As shown, when the water injection pressure relief valve 3 is opened, the upper cover 22 is rotated and closed. The upper cover 22 pushes the water injection pressure relief rod 34 downward. The water injection pressure relief rod 34 drives the sealing valve core 32 downward together until the limit block 345 abuts against the upper shell 311. At this time, the sealing valve core 32 is located in the middle of the inner cavity of the valve body 31, thus completing the opening; when the upper cover is opened, as... Figure 9As shown, under the action of the return spring 33, the water injection pressure relief rod 34 is pushed upward, thereby driving the sealing valve core 32 to move upward together until the sealing valve core 32 abuts against the inner wall of the upper shell 311, thus completing the sealing and closing of the water injection pressure relief valve 3; the sealing ring 322 contacts the upper shell 311 first, and the sealing valve core 32 continues to move upward a distance through its deformation, causing the sealing valve core 32 to deform, increasing the force of the sealing ring 322 against the upper shell 311, and improving the sealing effect; when the water injection pressure relief rod 34 moves up and down, the limiting strip 344 and the limiting groove 313 prevent the water injection pressure relief rod 34 from rotating, so as to improve stability. The sealing valve core 32 is snapped onto the water injection pressure relief rod 34 through the annular mounting groove 321 and the annular mounting platform 343, which facilitates replacement and maintenance.

[0061] Specifically, such as Figures 8 to 10 As shown, the sliding column 316 is fitted with a splash guard 35. The lower part of the splash guard 35 gradually extends outward from top to bottom to form a funnel shape. The diameter of the lower end of the splash guard 35 is greater than or equal to the diameter of the lower shell 314. After water flows out of the water outlet 315, it is diffused through the splash guard 35 to reduce the impact force of the water and prevent water from splashing. At the same time, during the water heating process, the water will boil. The splash guard 35 prevents the boiling hot water from splashing back, further improving safety and reliability.

[0062] Specifically, such as Figure 3As shown, the water tank 2 or the outer casing 1 is equipped with a cover sensor for detecting the opening and closing of the cover 22. The cover sensor is electrically connected to the control device. The extraction mechanism 9 includes an extraction cup 91 for holding coffee capsules and a water injection needle 94 for piercing the coffee capsule packaging and injecting water into it. The lower part of the extraction cup 91 is provided with a liquid outlet 92, and a piercing needle 93 extending upward into the extraction cup 91 is provided on the side of the liquid outlet 92. The upper part of the outer casing 1 is provided with an installation chamber, and the installation chamber is provided with an inner shell 11. The housing 21 is formed at the rear of the inner shell 11, and the extraction cup 91 is formed at the front of the inner shell 11. The cover 22... The rear side is hinged to the rear of the inner shell 11 or the outer shell 1. The upper cover 22 is closed to the installation chamber. The water injection needle 94 is set on the upper cover 22 and located above the extraction cup 91. The upper connecting pipe 23 is set in the middle of the upper cover 22. The lower connecting pipe 12 is set in the middle of the inner shell 11. The upper end of the upper connecting pipe 23 is connected to the upper end of the water injection needle 94 through the upper connecting line 24. The lower end of the upper connecting pipe 23 is movably connected to the upper end of the lower connecting pipe 12. The lower end of the lower connecting pipe 12 is connected to the drain port 82 through the lower connecting line 14. The water pump 13 is set on the lower connecting line 14. The control device determines whether to energize the heating element 7 and water pump 13 by detecting whether the lid 22 is closed using a lid-closing sensor, thus increasing the safety barrier and further improving safety. The lid-closing sensor uses a Hall effect sensor, with a magnet installed at the corresponding position on the lid 22, thereby detecting whether the lid 22 is closed through Hall effect sensing. The extraction cup 91 and the housing 21 are integrally molded to form the inner shell 11, reducing the number of parts, facilitating production and installation, reducing costs, and sharing the same lid 22, making the structure more compact. Water can be poured into the housing 21 at the same time as the coffee capsule is put in, simplifying the operation steps and making it more convenient to use.

[0063] The working principle of this invention is as follows:

[0064] Rotate to open the top cover 22, put the coffee capsule into the extraction cup 91, and pour the required amount of cold water into the box 21;

[0065] Rotate to close the top cover 22. The cover sensor sends a cover-closing control signal to the control circuit. The top cover 22 abuts against the water injection pressure relief rod 34, pushing the water injection pressure relief rod 34 to move downward. The water injection pressure relief rod 34 drives the sealing valve core 32 to move downward together until the limit block 345 abuts against the upper shell 311. At this time, the sealing valve core 32 is located in the middle of the inner cavity of the valve body 31. Water enters the interior of the valve body 31 through the gap between the water inlet hole 312 and the water injection pressure relief rod 34, and finally flows into the boiler 4 through the splash guard 35 from each water outlet hole 315.

[0066] When the top cover 22 is closed, the top cover 22 presses against the coffee capsule, causing the needle 93 to pierce the bottom packaging of the coffee capsule, and the water injection needle 94 to pierce the top packaging of the coffee capsule and insert into the inside of the coffee capsule. The upper connecting pipe 23 and the lower connecting pipe 12 are connected, thereby connecting the upper connecting line 24 and the lower connecting line 14.

[0067] As water is continuously injected into boiler 4, the water level in boiler 4 gradually rises until the temperature-sensitive metal casing 62 and the water level sensing probe 53 are connected by water, and the oscillation circuit sends a water full control signal to the control device.

[0068] After receiving the lid-closing control signal and the water-full control signal, the control device powers on the heating element 7, which heats the cold water in the boiler 4. During the heating process, steam is discharged into the water tank 2 through the water injection pressure relief rod 34 to relieve pressure. The control device controls the power of the heating element 7 in real time through the NTC sensor 61. When the NTC sensor 61 detects that the water has reached the preset temperature, the control device cuts off the power to the heating element 7 and starts the water pump 13. The hot water in the boiler 4 is filtered through the filter screen and injected into the capsule coffee through the water injection needle 94 for extraction. The extracted beverage flows out from the liquid outlet 92.

[0069] After extraction is complete, rotate the top cover 22 to open. Under the action of the return spring 33, push the water injection pressure relief rod 34 to move upward, thereby driving the sealing valve core 32 to move upward together until the sealing valve core 32 hits the inner wall of the upper shell 311, thereby closing the water injection pressure relief valve 3 and removing the used coffee capsule.

[0070] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A capsule coffee machine with an improved heating structure, comprising a housing (1) and a control device, a water tank (2), a boiler (4), an extraction mechanism (9), and at least one water pump (13) installed within the housing (1), wherein the control device is electrically connected to the water pump (13), the water tank (2) is connected to the boiler (4), the boiler (4) is connected to the extraction mechanism (9), and the water pump (13) is connected in series between the boiler (4) and the extraction mechanism (9), characterized in that: The water tank (2) includes a tank body (21), a top cover (22), and a water injection and pressure relief valve (3). The lower part of the tank body (21) is provided with a water inlet, which is connected to the boiler (4). The top cover (22) is hinged to one side of the tank body (21) or the outer shell (1). The water injection and pressure relief valve (3) is located at the water inlet. The water injection pressure relief valve (3) includes a valve body (31), a sealing valve core (32), a return spring (33), and a water injection pressure relief rod (34). The valve body (31) is embedded in the water injection port. The upper part of the valve body (31) is provided with a water inlet (312), and the lower part is provided with a water outlet (315). The water inlet (312) is connected to the interior of the water tank (2), and the water outlet (315) is connected to the interior of the boiler (4). The lower part of the water injection pressure relief rod (34) is slidably mounted on the valve body (31). The sealing valve core (32) is sleeved on the water injection port. The lower part of the water pressure relief rod (34) is located inside the valve body (31), the return spring (33) is located below the sealing valve core (32), the interior of the water pressure relief rod (34) is hollow, the lower end of the water pressure relief rod (34) is provided with an air inlet (341), the air inlet (341) is connected to the inner cavity of the boiler (4), the upper end of the water pressure relief rod (34) extends to the upper part of the box (21) and abuts against the upper cover (22), and at least one exhaust port (342) is provided on one side of the upper part of the water pressure relief rod (34); The boiler (4) is equipped with a water level sensing mechanism, a temperature sensing mechanism (6) and a heating tube (7). The two ends of the heating tube (7) extend out of the upper end face of the boiler (4) and are electrically connected to the control device. There is a heating gap between the heating tube (7) and the inner wall of the boiler (4). The water level sensing mechanism and the temperature sensing mechanism (6) are electrically connected to the control device. A slag discharge pipe (8) is provided at the lower part of the boiler (4). The upper part of the slag discharge pipe (8) is connected to the boiler (4). A slag discharge port (81) is provided at the lower part of the slag discharge pipe (8). A drain outlet (82) is provided on the side of the slag discharge pipe (8). The drain outlet (82) is connected to the water pump (13). A slag discharge filter assembly (84) is provided on the slag discharge pipe (8). The slag discharge filter assembly (84) includes a slag discharge valve and a filter screen. The filter screen is located at the upper end of the slag discharge valve and above the drain outlet (82). The upper part of the slag discharge valve is inserted into the slag discharge port (81). The lower part of the slag discharge valve is fixedly connected to the lower end of the slag discharge pipe (8) and seals the slag discharge pipe (8).

2. The capsule coffee machine with an improved heating structure according to claim 1, characterized in that: The slag discharge valve includes a slag discharge cap (841), a slag discharge valve core (842), a first sealing ring (85), and a connecting screw (843). The slag discharge cap (841) is provided with an upward-facing annular first drainage mounting groove (8411) and a second drainage mounting groove (8412). The second drainage mounting groove (8412) is located inside the first drainage mounting groove (8411). The inner wall of the first drainage installation groove (8411) is provided with a lower connecting buckle or a lower connecting thread, and the outer side of the lower end of the corresponding slag discharge pipe (8) is provided with an upper connecting buckle or an upper connecting thread. The upper connecting buckle and the lower connecting buckle are engaged, or the upper connecting thread and the lower connecting thread are threaded together. The first sealing ring (85) is provided between the slag discharge cap (841) and the slag discharge pipe (8). The slag discharge valve core (842) is located in the second drainage installation groove (8412). The filter screen is located at the upper end of the slag discharge valve core (842). The center of the slag discharge cap (841) is provided with a sealing installation hole (8413) that penetrates the slag discharge cap (841). The center of the slag discharge valve core (842) is provided with a rod hole (8421) that penetrates the slag discharge valve core (842). The sealing installation hole (8413) and the rod hole (8421) are aligned vertically. The connecting screw (843) passes through the sealing installation hole (8413) and the rod hole (8421) from bottom to top and is threaded to the filter screen.

3. A capsule coffee machine with an improved heating structure according to claim 2, characterized in that: The filter screen cover includes a filter frame (846) with a "T" shaped cross section and a stainless steel filter screen (847) that is fitted onto the upper part of the filter frame (846). The stainless steel filter screen (847) has multiple filter holes (848). The lower part of the filter frame (846) is inserted into the rod hole (8421). The connecting screw (843) is threadedly connected to the filter frame (846). A second sealing ring (844) is provided between the filter frame (846) and the slag discharge valve core (842). A third sealing ring (845) is provided between the slag discharge valve core (842) and the slag discharge pipe (8).

4. A capsule coffee machine with an improved heating structure according to claim 3, characterized in that: The slag discharge filter assembly (84) is also provided with an anti-loss connector (849), one end of which is fixedly installed on the bottom of the outer shell (1), and the other end of which is sleeved on the slag discharge cap (841). The upper end of the slag discharge pipe (8) is covered with a buffer cover (86), and the side of the buffer cover (86) is provided with multiple guide ports (861) spaced apart in the circumferential direction.

5. A capsule coffee machine with an improved heating structure according to any one of claims 2 to 4, characterized in that: The heating element (7) includes two straight segments (71) and one spiral segment (72). The two straight segments (71) are vertically spaced apart. The two ends of the spiral segment (72) are connected to the lower ends of the two straight segments (71), and the upper ends of the two straight segments (71) are electrically connected to the control device. A temperature control fuse is inserted in the center of the spiral section (72). The temperature control fuse includes a fuse housing (73) and two temperature fuse tubes (74). The two temperature fuse tubes (74) are respectively located inside the fuse housing (73) and connected in series between the two straight sections (71) and the control device. The lower end of the fuse housing (73) is fixedly installed in the boiler (4), and the upper end extends into the center of the spiral section (72).

6. A capsule coffee machine with an improved heating structure according to claim 5, characterized in that: The temperature sensing mechanism (6) includes an NTC sensor (61) and a temperature-sensing metal housing (62). The NTC sensor (61) is fixedly installed inside the temperature-sensing metal housing (62). The temperature-sensing metal housing (62) is fixedly installed at the lower part of the boiler (4) and extends into the interior of the boiler (4). The NTC sensor (61) is electrically connected to the control device. The water level sensing mechanism includes a first water level connecting line (51), a second water level connecting line (52), and a water level sensing probe (53). One end of the first water level connecting line (51) is electrically connected to the temperature sensing metal housing (62), and the other end is electrically connected to the control device. The upper part of the water level sensing probe (53) is fixedly installed on the upper part of the boiler (4), and the lower part of the water level sensing probe (53) extends into the interior of the boiler (4). The lower end of the water level sensing probe (53) is located above the spiral section (72). One end of the second water level connecting line (52) is electrically connected to the upper end of the water level sensing probe (53), and the other end is electrically connected to the control device.

7. A capsule coffee machine with an improved heating structure according to claim 5, characterized in that: The boiler (4) includes a boiler body (41) and a boiler cover (42). The boiler cover (42) is sealed and installed on the upper part of the boiler body (41). The heating element (7) and the water level sensing mechanism are respectively fixedly installed on the boiler cover (42). The temperature sensing mechanism (6) and the temperature control safety mechanism are both located on the lower part of the boiler body (41). The valve body (31) includes an upper shell (311) and a lower shell (314). The upper shell (311) is snapped to the upper part of the lower shell (314). The water inlet (312) is opened in the upper part of the upper shell (311). A sliding column (316) extends downward from the center of the lower shell (314). A sliding hole (317) is opened in the center of the sliding column (316). The lower part of the water injection pressure relief rod (34) passes through the water inlet (312) and is slidably installed in the sliding hole (317). The diameter of the water inlet (312) is larger than the diameter of the water injection pressure relief rod (34). Multiple water outlet holes (315) are opened on the periphery of the sliding column (316).

8. A capsule coffee machine with an improved heating structure according to claim 7, characterized in that: The sealing valve core (32) is made of soft rubber ring. The inner ring of the sealing valve core (32) is provided with an annular mounting groove (321). The lower outer side of the water injection pressure relief rod (34) is provided with an annular mounting platform (343). The annular mounting groove (321) and the annular mounting platform (343) are snapped together. The outer edge of the upper end face of the sealing valve core (32) is provided with an upwardly protruding sealing ring (322). The diameter of the sealing ring (322) is larger than the diameter of the water inlet hole (312). The upper end of the return spring (33) abuts against the sealing valve core (32) or the annular mounting platform (343), and the lower end abuts against the lower shell (314). At least one limiting strip (344) and a limiting block (345) are provided on the outer side of the lower part of the water injection pressure relief rod (34). The limiting strip (344) is located above the annular mounting platform (343), and the limiting block (345) is located above the upper shell (311). The upper shell (311) is provided with a limiting groove (313). The limiting strip (344) is in a limiting engagement with the limiting groove (313), and the limiting block (345) is in a limiting engagement with the upper shell (311).

9. A capsule coffee machine with an improved heating structure according to claim 8, characterized in that: The sliding column (316) is fitted with a splash guard (35), the lower part of which gradually extends outward from top to bottom to form a horn-shaped splash guard (35), and the diameter of the lower end of the splash guard (35) is greater than or equal to the diameter of the lower shell (314).

10. A capsule coffee machine with an improved heating structure according to claim 5, characterized in that: The water tank (2) or the outer shell (1) is provided with a cover sensor for detecting the opening and closing of the cover (22), and the cover sensor is electrically connected to the control device; The extraction mechanism (9) includes an extraction cup (91) for holding coffee capsules and a water injection needle (94) for piercing the coffee capsule packaging and injecting water into it. The lower part of the extraction cup (91) is provided with a liquid outlet (92), and a piercing needle (93) extending upward into the extraction cup (91) is provided on the side of the liquid outlet (92). The upper part of the outer shell (1) is provided with an installation chamber, and the installation chamber is provided with an inner shell (11). The box body (21) is formed on the rear part of the inner shell (11), and the extraction cup (91) is formed on the front part of the inner shell (11). The rear side of the upper cover (22) is hinged to the rear part of the inner shell (11) or the outer shell (1), and the upper cover (22) covers the installation chamber. The water injection needle (94) is located on the upper cover (22) and above the extraction cup (91). An upper connecting pipe (23) is provided in the middle of the upper cover (22), and a lower connecting pipe (12) is provided in the middle of the inner shell (11). The upper end of the upper connecting pipe (23) is connected to the upper end of the water injection needle (94) through an upper connecting line (24). The lower end of the upper connecting pipe (23) is movably connected to the upper end of the lower connecting pipe (12). The lower end of the lower connecting pipe fitting (12) is connected to the drain outlet (82) via the lower connecting pipe (14). The water pump (13) is installed on the lower connecting pipeline (14).

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