Coffee machine

Abstract

The coffee machine comprises a water tank, a liquid level stabilizing module, a brewing module, a pipeline, a heating piece and a pressure device, and the water tank is provided with a water tank water outlet; the liquid level stabilizing module comprises a shell and a floater assembly, the shell is provided with a water inlet communicated with the water outlet of the water tank, a first outlet and a second outlet, the second outlet is communicated with the atmosphere, and the floater assembly is used for sealing the water inlet; the pipeline is communicated with the first outlet and the brewing module; the heating piece is arranged on the pipeline; the pressure device comprises a device body, a hot water input pipe and a hot water output pipe, the hot water input pipe is communicated with the pipeline, one end of the hot water output pipe extends into the device body, and the other end of the hot water output pipe is communicated with the brewing module, so that liquid in the pipeline is introduced into the brewing module. According to the technical scheme, the water outlet temperature can be guaranteed, and meanwhile, the water outlet duration of water flowing out of the water tank is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of coffee machines, and in particular to a coffee machine. Background Art

[0002] The coffee machines currently in use generally include a water tank module, a heating module and a brewing module, wherein the water tank module, the heating module and the brewing module are connected in series in sequence to form a connected water system, ensuring that the water in the water tank module flows into the heating module, and the hot water generated by the heating action of the heating module flows into the powder bin in the brewing module to achieve coffee brewing.

[0003] When the flow path between the heating module and the brewing module is long, the hot water flowing to the brewing module is likely to fall back to the heating module for multiple heating, resulting in overheating of the water temperature and a significant increase in the water vapor generated. At the same time, the water flow rate becomes smaller, which greatly prolongs the time it takes for the water in the water tank module to flow out. This cannot meet the ECBC (European Coffee Brewing Center) requirements for water output time, that is, 1.25L of water needs 6 minutes to flow out. Summary of the invention

[0004] The main purpose of the present invention is to provide a coffee machine, which aims to shorten the water outlet time of the water in the water tank while ensuring the outlet water temperature.

[0005] To achieve the above object, the coffee machine provided by the present invention comprises:

[0006] A water tank having a water tank outlet;

[0007] A liquid level stabilization module, comprising a shell and a float assembly, wherein the shell is provided with a water inlet connected to the water outlet of the water tank, and is provided with a first outlet and a second outlet, wherein the second outlet is connected to the atmosphere, and the float assembly is used to open or close the water inlet;

[0008] a brewing module and a pipeline, wherein the pipeline is connected to the first outlet and the brewing module;

[0009] a heating element, disposed on the pipeline; and

[0010] The pressure device includes a device body, a hot water input pipe and a hot water output pipe, wherein the hot water input pipe is connected to the pipeline, one end of the hot water output pipe extends into the device body, and the other end is connected to the brewing module to pass the liquid in the pipeline into the brewing module.

[0011] Optionally, before the water in the device body flows into the brewing module, the air pressure P1 in the device body, the distance H2 between the liquid level in the shell and the plane where the outlet of the hot water output pipe is located satisfy: P1≥ρg(H2-10).

[0012] Optionally, the coffee machine further comprises a one-way valve, wherein the one-way valve is disposed between the liquid level stabilization module and the heating element, and a conducting direction of the one-way valve is configured to be a direction from the liquid level stabilization module toward the pipeline.

[0013] Optionally, when the float assembly seals the water inlet, the distance H1 between the liquid level in the shell and the one-way valve, the air pressure P1 in the device body, and the cut-off pressure P of the one-way valve satisfy: ρgH1+P1-10%≤P≤ρgH1+P1+10%.

[0014] Optionally, the hot water input pipe is connected to the bottom of the device body, and one end of the hot water output pipe extending into the device body is lower than the liquid level in the liquid level stabilization module.

[0015] Optionally, the hot water input pipe is connected to the top of the device body, and one end of the hot water output pipe extending into the device body is lower than the liquid level in the liquid level stabilization module.

[0016] Optionally, the pipeline has a pipeline portion in which the internal liquid flows upward, and the heating element is at least arranged on the pipeline portion.

[0017] Optionally, the heating element is arranged in an L shape.

[0018] Optionally, the float assembly includes a float body, which is disposed in the shell and can, under the action of buoyancy, have a first state of sealing the water inlet and a second state of opening the water inlet.

[0019] Optionally, the maximum buoyancy value of the float body is 2 to 5 times the deadweight of the float body;

[0020] And / or, a ratio of a cross-sectional area of ​​the shell to a cross-sectional area of ​​the float body is s, and 1.2≤s≤3.

[0021] Optionally, the coffee machine further comprises a water shortage detection device, and the water shortage detection device is arranged in the water tank and / or the liquid level stabilization module;

[0022] And / or, the power P of the heating element satisfies: 1300W≤P≤1600W.

[0023] In the technical solution of the present invention, a pressure device is provided between the heating element and the brewing module, and the generated hot water is pressed toward the brewing module by means of segmented delivery, thereby effectively limiting the hot water flowing to the brewing module from falling back into the pipe corresponding to the heating element, reducing the possibility of excessive water temperature, increased water vapor, and reduced water volume due to repeated heating, and ensuring the water outlet temperature and water volume. By using the float assembly 22 to repeatedly switch between the first state and the second state, the liquid in the water tank 11 continuously flows into the pipe corresponding to the heating element, and through the cooperation of the heating element and the pressure device, on the one hand, the water outlet temperature can reach the specified temperature to ensure the taste of the brewed coffee, and on the other hand, the generated hot water can reliably flow to the brewing module, thereby effectively controlling the water outlet flow of the coffee machine, shortening the time for the water in the water tank 11 to flow out, and meeting the requirements of ECBC (European Coffee Brewing Center) on the water outlet time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of an embodiment of a coffee machine of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of liquid flow in the coffee machine;

[0027] Figure 3 FIG. 2 is a schematic structural diagram of another embodiment of a coffee machine according to the present invention.

[0028] Description of Figure Numbers:

[0029] Label name Label name 10 Water tank module 412 Second pipe section 11 Water tank 413 The third pipe section 20 Liquid level stabilization module 421 The first heating element 21 case 422 The second heating element 22 Float assembly 51 Pressure device 30 Brewing Module 511 Device body 31 Powder silo 512 Hot water inlet pipe 32 Water vapor separation device 513 Hot water output pipe 40 Heating module 52 Check valve 41 pipeline 60 Wetted Module 411 First pipe section 70 Insulation module

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions, taking "A and / or B as an example", including solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The invention provides a coffee machine.

[0036] Reference Figure 1In an embodiment of the present invention, the coffee machine includes a water tank 11, a liquid level stabilizing module 20, a brewing module 30, a pipeline 41, a heating element and a pressure device 51. The water tank 11 is provided with a water tank outlet; the liquid level stabilizing module 20 includes a shell 21 and a float assembly 22, the shell 21 is provided with a water inlet connected to the water tank outlet, and is provided with a first outlet and a second outlet, the second outlet is connected to the atmosphere, and the float assembly 22 is used to open or close the water inlet; the pipeline 41 is connected to the first outlet and the brewing module 30; the heating element is arranged on the pipeline 41; the pressure device 51 includes a device body 511, a hot water input pipe 512 and a hot water output pipe 513, the hot water input pipe 512 is connected to the pipeline 41, one end of the hot water output pipe 513 extends into the device body 511, and the other end is connected to the brewing module 30, so as to pass the liquid in the pipeline 41 into the brewing module 30. In this way, the outlet water temperature can be guaranteed while shortening the outlet water time of the water in the water tank 11 .

[0037] The coffee machine includes a water tank module 10, a liquid level stabilizing module 20, a heating module 40, a brewing module 30, a liquid receiving module 60 and a heat preservation module 70, wherein the liquid level stabilizing module 20 is connected between the water tank module 10 and the heating module 40, that is, the shell 21 is connected to the water tank 11 and the pipeline 41; the brewing module 30 is connected to the heating module 40, that is, the water vapor separation device 32 of the brewing module 30 is connected to the pipeline 41, so that the water in the water tank 11 flows through the shell 21 and the pipeline 41, and is sprayed out by the water vapor separation device 32. In this process, the water flow is heated by the heating element to ensure that the hot water flows into the powder bin 31 of the brewing module 30 and mixes with the coffee powder in the powder bin 31; and the brewed coffee flows into the liquid receiving module 60, such as a coffee cup, wherein the heat preservation module 70 is arranged below the liquid receiving module 60 to maintain the temperature of the coffee in the liquid receiving module 60 and ensure the coffee quality.

[0038] The liquid level stabilization module 20 includes a shell 21, wherein the shell 21 is provided with a water inlet, which is connected to the water outlet of the water tank. It can be understood that the water inlet and the water outlet of the water tank can be the same water outlet, that is, the shell 21 is directly covered on the edge of the water outlet of the water tank, and is enclosed with the wall of the water tank 11 to form a cavity that can store water; or, the water inlet and the water outlet of the water tank are connected by a water connecting pipe. At this time, the shell 21 can be located on the side of the water tank 11, and the side can be the left side, the bottom, or the top, which is not limited here.

[0039] The heating element is arranged in the pipe 41. It can be understood that the heating element can be coated on the outer peripheral surface of the pipe 41 or attached to the inner wall surface of the pipe 41, both of which can fully heat the water flow in the pipe 41 corresponding to the heating element to ensure the increase of water temperature.

[0040] A liquid level stabilization module 20 is arranged between the water tank 11 and the pipeline 41, and is connected to the water tank 11 by means of the liquid level stabilization module 20, and is connected to the water vapor separation device 32 in the brewing module 30 by means of the pipeline 41, and the second outlet of the shell 21 is connected to the atmosphere, and the water vapor separation device 32 is connected to the atmosphere, so that the water in the water tank 11 flows through the shell 21 and flows to the pipeline 41, so that the liquid level in the pipeline 41 and the liquid level in the shell 21 are maintained at the same level.

[0041] Since a float assembly 22 is provided in the shell 21, and the float assembly 22 is used to open or close the water inlet, it can be understood that the float assembly 22 can move relative to the shell 21 under the buoyancy of water, and thus has a first state of closing the water inlet and a second state of opening the water inlet. By controlling the water outlet flow rate of the water tank 11, the stable water outlet of the water tank 11 is ensured, so that the liquid level in the pipe 41 and the liquid level in the shell 21 are always maintained at the same horizontal plane, and thus, the liquid level in the pipe 41 can be maintained at an approximately constant position, ensuring the time that the water flows in the pipe 41, and the heat emitted by the heating element can fully heat the water flow in the pipe 41 corresponding to the heating element, ensuring that the water temperature of the water flowing out of the heating element is approximately constant.

[0042] After heating for a certain period of time, the water in the pipe 41 is heated to generate steam pressure, and then the water in the pipe 41 flows into the powder bin 31 of the brewing module 30 under the action of the steam pressure; when the pipe 41 between the heating element and the brewing module 30 is too long, the pressure generated is not enough to support the complete spraying of hot water, which may easily cause part of the hot water flowing to the brewing module 30 to fall back to the heating module 40 for repeated heating, thereby affecting the water outlet temperature, water output and water outlet time.

[0043] Therefore, the present application provides a pressure device 51 between the heating element and the brewing module 30, so as to unidirectionally pass the liquid in the pipeline 41 into the powder bin 31 of the brewing module 30 through the pressure device 51. Specifically, the pressure device 51 is connected in series between the pipeline and the brewing module 30 through the hot water input pipe 512 and the hot water output pipe 513. At this time, the pressure device 51, as an intermediate device, can improve the water outlet temperature, water outlet volume and water outlet time by transporting the generated hot water in sections; the heating element heats the water in the pipeline 41, and when the hot water temperature reaches the preset temperature, the steam pressure generated by the heating is used to make the water in the pipeline 41 flow into the device body 511, and the generated water vapor will also gather in the device body 511, and the pressure generated by the water vapor can press the hot water placed in the device body 511 toward the brewing module 30, thereby And, the hot water flowing to the brewing module 30 is effectively restricted from falling back into the pipe 41 corresponding to the heating element, thereby reducing the possibility of excessive water temperature, increased water vapor and reduced water volume due to repeated heating, thereby ensuring the water outlet temperature and water volume; further, the float assembly 22 is used to repeatedly switch between the first state and the second state, so as to cause the liquid in the water tank 11 to continuously flow into the pipe 41 corresponding to the heating element. Through the cooperation of the heating element and the pressure device 51, on the one hand, the water outlet temperature can reach the specified temperature, for example, between 92°C and 96°C, and the brewed coffee has a better taste. On the other hand, the generated hot water can reliably flow to the brewing module 30, thereby effectively controlling the water outlet flow rate of the coffee machine, shortening the time for the water in the water tank 11 to flow out, and meeting the ECBC (European Coffee Brewing Center) requirements for water outlet time.

[0044] In the technical solution of the present invention, a pressure device 51 is provided between the heating element and the brewing module 30, and the generated hot water is pressed toward the brewing module 30 by means of segmented delivery, thereby effectively limiting the hot water flowing to the brewing module 30 from falling back into the pipe 41 corresponding to the heating element, reducing the possibility of excessive water temperature, increased water vapor, and reduced water volume due to repeated heating, and ensuring the water outlet temperature and water volume. By using the float assembly 22 to repeatedly switch between the first state and the second state, the liquid in the water tank 11 continuously flows into the pipe 41 corresponding to the heating element, and through the cooperation of the heating element and the pressure device 51, on the one hand, the water outlet temperature can reach the specified temperature to ensure the taste of the brewed coffee, and on the other hand, the generated hot water can reliably flow to the brewing module 30, thereby effectively controlling the water outlet flow of the coffee machine, shortening the time for the water in the water tank 11 to flow out, and meeting the requirements of ECBC (European Coffee Brewing Center) on the water outlet time.

[0045] Reference Figure 2In one embodiment, before the water in the device body 511 flows into the brewing module 30, the air pressure P1 in the device body 511 and the distance H2 between the liquid level in the shell 21 and the plane where the outlet of the hot water output pipe 513 is located satisfy: P1≥ρg(H2-10). By limiting the size of the air pressure in the device body 511, the water output of the brewing module 30 and the water outlet temperature of the pipeline 41 can be guaranteed.

[0046] The air pressure in the device body 511 is limited by the steam pressure generated by heating and gathered in the device body 511, so that the hot water placed in the device body 511 can flow toward the brewing module 30 under the pressure. By limiting P1≥ρg(H2-10), the amount of hot water flowing out through the outlet of the hot water output pipe 513 is increased, and the influence of the excessive length of the pipe 41 between the heating element and the brewing module 30 is reduced. The 10 in the relationship is a constant, corresponding to: under the pressure generated by the water temperature reaching 95°C or above, the height difference between the maximum height that the hot water can jump and the liquid level in the shell 21. In other words, when P1≥ρg(H2-10), the outlet water temperature of the hot water flowing out of the pipe 41 is limited to 95°C or above, ensuring the brewing quality of coffee. According to different outlet water temperature requirements, the height difference between the maximum height that the water at the corresponding temperature jumps under the pressure generated by the temperature and the liquid level in the shell 21 changes accordingly.

[0047] Optionally, in one embodiment, the coffee machine further comprises a one-way valve 52, wherein the one-way valve 52 is disposed between the liquid level stabilizing module 20 and the heating element, and the conducting direction of the one-way valve 52 is configured to be from the liquid level stabilizing module 20 toward the pipe 41, so that the flow direction of the water flow can be controlled to prevent the water flow in the pipe 41 from flowing back to the liquid level stabilizing module 20 under the action of the steam pressure; the steam pressure in the pipe 41 can also be prevented from blocking the outlet of the one-way valve 52. Specifically, by disposing the one-way valve 52 at a position close to the inlet of the pipe 41 corresponding to the heating element, at this time, since the distance H1 between the first outlet of the liquid level stabilizing module 20 and the one-way valve 52 is large, the water pressure is large, thereby facilitating the water in the liquid level stabilizing module 20 to flow into the pipe 41 and be heated by the heating element. Specifically, the one-way valve 52 is configured as a one-way valve with no opening pressure, that is, in the process of water flowing from the liquid level stabilization module 20 to the pipeline 41, the one-way valve 52 is equivalent to one section in the pipeline 41, and can allow water to flow smoothly through the one-way valve 52 without any obstruction, which is beneficial to improving the efficiency of replenishing the pipeline 41.

[0048] Furthermore, in one embodiment, when the float assembly seals the water inlet, the distance H1 between the liquid level in the shell 21 and the one-way valve 52, the air pressure P1 in the device body 511, and the cut-off pressure P of the one-way valve 52 satisfy: ρgH1+P1-10%≤P≤ρgH1+P1+10%, thereby ensuring the normal opening and closing of the one-way valve 52, and, in conjunction with the setting of P1≥ρg(H2-10), the water outlet temperature and water output can be further guaranteed, thereby shortening the time for the water in the water tank 11 to flow out.

[0049] Specifically, by setting the cut-off pressure of the one-way valve 52 near ρgH1+P1, it is possible to avoid excessive pressure in the pipeline 41 that would cause reverse blocking of the one-way valve 52, reduce the possibility of the one-way valve 52 being in a state of being nearly closed or closed, and ensure that the water in the liquid level stabilization module 20 can be smoothly replenished into the pipeline 41, reducing the possibility of dry burning.

[0050] Reference Figure 2 In one embodiment, the hot water input pipe 512 is connected to the bottom of the device body 511, and one end of the hot water output pipe 513 extending into the device body 511 is lower than the liquid level in the liquid level stabilization module 20. It can be understood that the hot water input pipe 512 and the pipeline 41 are the same water pipe, and directly connected to the bottom of the device body 511, which helps to reduce the length and number of water pipes. By setting the device body 511 on the side of the liquid level stabilization module 20, and its height is roughly the same as the height of the liquid level stabilization module 20, in this way, in the first state, the float assembly 22 closes the water inlet, and the heating element heats the pipe 41. Before the water is added, the liquid level in the device body 511 is flush with the liquid level in the shell 21, the device body 511 is filled with water and submerged in the inlet of the hot water output pipe 513, that is, the liquid level in the device body 511 is higher than the inlet of the hot water output pipe 512. When the hot water temperature reaches the preset temperature, the hot water of the heating element replaces the water in the device body 511, or heats the water in the device body 511. Then, the pressure in the device body 511 increases and reaches a certain value. In combination with the settings such as P1≥ρg(H2-10), the hot water placed in the device body 511 can be reliably pressed toward the brewing module 30, and the water outlet temperature, water outlet volume and water outlet time are guaranteed.

[0051] In addition, the volume of water submerged in the hot water output pipe 513 is equal to the volume of the pipe portion of the hot water output pipe 513 with a length of H2, and is also equal to the water flow rate pressed toward the brewing module 30.

[0052] Reference Figure 3In one embodiment, the hot water input pipe 512 is connected to the top of the device body 511, and the end of the hot water output pipe 513 extending into the device body 511 is lower than the liquid level in the liquid level stabilization module 20. It can be understood that the hot water input pipe 512 and the pipeline 41 are connected as an integral pipe, and the end away from the pipeline 41 can be connected to the top of the device body 511. Of course, in other embodiments, the hot water input pipe 512 can be connected to the side of the device body 511. The device body 511 is set on the side of the liquid level stabilization module 20, and its height can be set arbitrarily, such as higher than the liquid level in the shell 21. In this way, in the first state, the float group Component 22 closes the water inlet, and before the heating component heats the water in the pipe 41, the liquid level in the pipe 41 is flush with the liquid level in the shell 21. When the heating component heats the water in the pipe 41 to a preset temperature, due to the increase in pressure in the pipe 41, the water in the pipe 41 flows to the device body 511 through the hot water input pipe 512, and can submerge the inlet of the hot water output pipe 513, that is, the liquid level in the device body 511 is higher than the inlet of the hot water output pipe 512. When the pressure in the device body 511 increases and reaches a certain value, the hot water in the device body 511 can be pressed toward the brewing module 30, thereby ensuring the outlet water temperature, water output and water output time.

[0053] Reference Figure 2 In one embodiment, the pipeline 41 has a pipeline portion in which the internal liquid flows upward, and the heating element is at least arranged on the pipeline portion. It can be understood that the pipeline 41 includes a first pipe section 411 and a second pipe section 412, both of which extend up and down and are connected. The first pipe section 411 is connected to the first outlet, and the second pipe section 412 is connected to the hot water input pipe 512, wherein the liquid in the second pipe section 412 flows upward, and the first pipe section 411 and the second pipe section 412 can be directly connected or connected through other pipe sections, which is not limited here; the heating element includes a first heating element 421 arranged on the second pipe section 412, and the pressure device 51 is connected to the second pipe section 412 In this way, after heating for a certain period of time, the water in the second pipe section 412 is heated to generate steam pressure, and the steam pressure mainly acts on the water flow in the second pipe section 412, so that the water flows to the powder bin 31 of the brewing module 30, effectively preventing the water in the pipeline 41 from flowing back due to the steam pressure, and preventing the steam pressure from acting on the first outlet or the one-way valve 52, affecting the stable outflow of water in the liquid level stabilization module 20 or the water tank 11; facilitating the outflow of water in the water tank 11 and replenishing it to the second pipe section 412, so that the liquid level of the water in the second pipe section 412 is relatively constant, ensuring that the water temperature of the water flowing out of the heating element is roughly constant, while reducing the possibility of dry burning, thereby improving safety in use.

[0054] Further, in one embodiment, the pipeline 41 further includes a third pipe section 413, and the third pipe section 413 is connected to the first pipe section 411 and the second pipe section 412; the heating element further includes a second heating element 422, and the second heating element 422 is arranged in the third pipe section 413 and is arranged away from the first pipe section 411. At this time, the one-way valve 52 can be arranged in the third pipe section 413, and can also be arranged in the second pipe section 412, and is arranged close to the third pipe section 413, so that a large amount of steam pressure can be effectively prevented from flowing to the first pipe section 411 through the third pipe section 413, and the influence on the stable outflow of water in the liquid level stabilization module 20 can be reduced. At the same time, by setting the second heating element 422 in the third pipe section 413, the length of the pipeline 41 that can generate heat can be extended, which is conducive to increasing the area of ​​water heated in the pipeline 41 and the amount of hot water formed. The third pipe section 413 can extend in a winding manner or in a straight line.

[0055] Furthermore, the heating element is arranged in an L shape, wherein the first heating element 421 and the second heating element 422 are arranged integrally, which is conducive to reducing the assembly process and avoiding the generation of a gap between the first heating element 421 and the second heating element 422, resulting in the water flow in the pipe 4141 corresponding to the gap not being effectively heated, thereby reducing the influence of the water flow on the temperature of the water flow heated by the first heating element 421 and the second heating element 422.

[0056] Optionally, in one embodiment, the float assembly 22 includes a float body, which is arranged in the shell 21 and can, under the action of buoyancy, have a first state of sealing the water inlet and a second state of opening the water inlet; it is understandable that when the water in the water tank 11 flows into the shell 21 through the water inlet and the liquid level in the shell 21 gradually rises, the float body rises with the rise of the liquid level, and when the liquid level rises to a certain height, the float body is aligned with the water inlet and seals the water inlet and is in the first state, at this time, the liquid level in the shell 21 is in a stable state, and at the same time, the liquid level in the pipe 41 is at the same horizontal plane as the liquid level in the shell 21; when the water flow in the pipe 41 is heated, the steam pressure generated causes the water flow in the pipe 41 to at least partially flow out. The powder bin 31 in the brewing module 30 flows into the powder bin 31. Due to the change in the pressure in the pipe 41 and the reduction in the amount of water, the water in the liquid level stabilization module 20 flows into the pipe 41, and the liquid level in the shell 21 decreases. The float body will fall with the decrease of the liquid level. When it falls to the point where it is separated from the water inlet, the float body no longer blocks the water inlet and is in the second state. At this time, the water in the water tank 11 flows into the shell 21, and the liquid level will rise, and drive the float body to reseal the water inlet, thereby repeatedly switching between the first state and the second state, reliably ensuring that the liquid level in the pipe 41 is always at a constant height, thereby ensuring the retention time of the water flow in the pipe 41, and allowing the heat emitted by the heating element to fully heat the water flow in the pipe 41 corresponding to the heating element, ensuring that the water temperature of the water flow out of the heating element is approximately constant. The float body can be configured as a float valve. The float body can be slidably connected to the shell 21, and the sliding direction is along the axial direction of the water inlet, and the first state and the second state can be effectively switched in the direction of the buoyancy. The float body can also be rotatably connected to the shell 21, and its rotation direction is coordinated with the direction of the buoyancy to achieve the switching between the first state and the second state.

[0057] Optionally, in one embodiment, the maximum buoyancy value of the float body is 2 to 5 times the deadweight of the float body; wherein the maximum buoyancy value refers to the buoyancy value generated when the float body is completely immersed. When the buoyancy of the float body is too small, the immersed volume of the float body is larger due to the heavier float body. Therefore, when the water shortage detection device in the coffee machine connects the magnet to the float body, it is easy to trigger the water shortage detection device by mistake, thereby affecting the detection accuracy of the water shortage detection device. When the buoyancy of the float body is too large, the immersed volume of the float body is smaller. Moreover, due to the excessive buoyancy, the float body blocks the water inlet after a small amount of water is added to the shell 21, which causes the liquid level in the shell 21 to always be at a low water level, which easily affects the drainage capacity of the liquid level stabilization module 20 and the number of times the float body switches the water inlet. The water level in the shell 21 does not change significantly. Therefore, by limiting the maximum buoyancy value of the float body to 2 to 5 times the weight of the float body, the reliability of the subsequent water shortage detection device in detecting the water shortage of the coffee machine can be guaranteed, as well as the drainage capacity and water output stability of the liquid level stabilization module 20.

[0058] Among them, the ratio of the maximum buoyancy value exerted on the float body to the dead weight of the float body can be 2, 2.1, 2.3, 2.5, 2.7, 2.9, 3, 3.2, 3.4, 3.6, 3.8, 4, 4.1, 4.3, 4.5, 4.7, 5, etc., preferably 2.7 times.

[0059] Optionally, in one embodiment, the ratio of the cross-sectional area of ​​the shell 21 to the cross-sectional area of ​​the float body is s, 1.2≤s≤3, ensuring that the shell 21 has a larger water capacity. At the same time, during the switching process between the first state and the second state, it is ensured that the float body can float and sink smoothly in the shell 21, thereby improving the water discharge reliability of the liquid level stabilization module 20, and also facilitating the assembly of the magnet on the float body and the coordination with the reed switch, Hall sensor, etc., thereby improving the detection accuracy of the water shortage detection device.

[0060] Among them, the specific ratio between the cross-sectional area of ​​the shell 21 and the cross-sectional area of ​​the float body can be 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, etc., preferably 1.3.

[0061] Optionally, in one embodiment, the coffee machine further includes a water shortage detection device, and the water shortage detection device is disposed in the water tank 11 and / or the liquid level stabilization module 20, so as to send out corresponding signals and warnings and cut off the power supply to the heating element when the water tank 11 or the shell 21 is in a water shortage state, or when both the water tank 11 and the shell 21 are in a water shortage state, to prevent dry burning.

[0062] Specifically, the water shortage detection device can monitor the water level by means of a reed switch or Hall sensor matched with a magnet, capacitance detection, infrared detection, etc.

[0063] Optionally, in one embodiment, the power P of the heating element satisfies: 1300W≤P≤1600W, so that the power P of the heating element can be controlled between 1300W and 1600W, so as to control the heating speed and heating time of the water flow by the heating module 40.

[0064] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A coffee machine, It is characterized in that include: A water tank having a water tank outlet; A liquid level stabilization module, comprising a shell and a float assembly, wherein the shell is provided with a water inlet connected to the water outlet of the water tank, and is provided with a first outlet and a second outlet, wherein the second outlet is connected to the atmosphere, and the float assembly is used to open or close the water inlet; a brewing module and a pipeline, wherein the pipeline is connected to the first outlet and the brewing module; a heating element, disposed on the pipeline; and The pressure device includes a device body, a hot water input pipe and a hot water output pipe, wherein the hot water input pipe is connected to the pipeline, one end of the hot water output pipe extends into the device body, and the other end is connected to the brewing module to pass the liquid in the pipeline into the brewing module.

2. The coffee machine according to claim 1, It is characterized in that Before the water in the device body flows into the brewing module, the air pressure P1 in the device body, the distance H2 between the liquid level in the shell and the plane where the outlet of the hot water output pipe is located satisfy: P1≥ρg(H2-10).

3. The coffee machine according to claim 2, It is characterized in that The coffee machine further comprises a one-way valve, which is arranged between the liquid level stabilizing module and the heating element, and the conducting direction of the one-way valve is configured to be from the liquid level stabilizing module toward the pipeline.

4. The coffee machine according to claim 3, It is characterized in that When the float assembly seals the water inlet, the distance H1 between the liquid level in the shell and the one-way valve, the air pressure P1 in the device body, and the cut-off pressure P of the one-way valve satisfy: ρgH1+P1-10%≤P≤ρgH1+P1+10%.

5. The coffee machine according to claim 1, It is characterized in that The hot water input pipe is connected to the bottom of the device body, and one end of the hot water output pipe extending into the device body is lower than the liquid level in the liquid level stabilization module.

6. The coffee machine according to claim 1, It is characterized in that The hot water input pipe is connected to the top of the device body, and one end of the hot water output pipe extending into the device body is lower than the liquid level in the liquid level stabilization module.

7. The coffee machine according to any one of claims 1 to 6, It is characterized in that The pipeline has a pipeline portion where the internal liquid flows upward, and the heating element is at least arranged on the pipeline portion.

8. The coffee machine according to claim 7, It is characterized in that The heating element is arranged in an L shape.

9. The coffee machine according to claim 1, It is characterized in that The float assembly comprises a float body, which is arranged in the housing and can have a first state of sealing the water inlet and a second state of opening the water inlet under the action of buoyancy.

10. The coffee machine according to claim 9, It is characterized in that The maximum buoyancy value of the float body is 2 to 5 times the deadweight of the float body; And / or, a ratio of a cross-sectional area of ​​the shell to a cross-sectional area of ​​the float body is s, and 1.2≤s≤3.

11. The coffee machine according to claim 1, It is characterized in that The coffee machine further comprises a water shortage detection device, and the water shortage detection device is arranged on the water tank and / or the liquid level stabilization module; And / or, the power P of the heating element satisfies: 1300W≤P≤1600W.

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