CN117378929A - Coffee machine - Google Patents

Abstract

The invention discloses a coffee machine, wherein the coffee machine comprises a water tank, a liquid level stabilizing module, a brewing module, a pipeline, a heating piece and a first one-way valve, wherein a water tank water outlet is formed in the water tank; the liquid level stabilizing module comprises a shell and a float assembly, wherein the shell is provided with a water inlet communicated with a water outlet of the water tank, a first outlet and a second outlet, the second outlet is communicated with the atmosphere, and the float assembly is used for opening or closing the water inlet; the pipeline is communicated with the first outlet communication and the brewing module; the heating element is arranged on the pipeline; the first one-way valve is arranged in the pipeline and is positioned between the heating piece and the brewing module, and the conducting direction of the first one-way valve is configured to be from the pipeline to the direction of the brewing module. The technical scheme of the invention can ensure the water outlet temperature and simultaneously shorten the water outlet time of the water in the water tank.

Description

Coffee machine

Technical Field

The invention relates to the technical field of coffee machines, in particular to a coffee machine.

Background

The coffee machine used at present generally comprises a water tank module, a heating module and a brewing module, wherein the water tank module, the heating module and the brewing module are sequentially connected in series to form a communicated waterway system, so that the water in the water tank module flows into the heating module, and hot water generated under the heating effect of the heating module flows into a powder bin in the brewing module to brew coffee.

When the flow path between the heating module and the brewing module is longer, hot water flowing to the brewing module is easy to fall back to the heating module for heating for a plurality of times, so that the water temperature is overheated, generated water vapor is greatly increased, meanwhile, the water flow is reduced, the time for flowing out water in the water tank module is greatly prolonged, and the requirement of ECBC (European coffee brewing center) on the water outlet time length cannot be met, namely, 1.25L of water needs 6MIN to flow out.

Disclosure of Invention

The invention aims to provide a coffee machine, which aims to shorten the water outlet time of water in a water tank while guaranteeing the water outlet temperature.

To achieve the above object, the present invention provides a coffee machine comprising:

the water tank is provided with a water tank water outlet;

the liquid level stabilizing module comprises a shell and a float assembly, wherein the shell is provided with a water inlet communicated with a water outlet of the water tank, a first outlet and a second outlet, the second outlet is communicated with the atmosphere, and the float assembly is used for opening or closing the water inlet;

a brewing module and a conduit communicating the first outlet communication with the brewing module;

the heating piece is arranged on the pipeline; and

the first one-way valve is arranged in the pipeline and positioned between the heating piece and the brewing module, and the conducting direction of the first one-way valve is configured to be from the pipeline to the direction of the brewing module.

Optionally, when the float assembly seals the water inlet, in the vertical direction of the coffee machine, the height difference between the liquid level in the housing and the first one-way valve is H2, 10mm < H2 < 20mm.

Optionally, the coffee machine further comprises a water outlet pipe, wherein the water outlet pipe is communicated with the pipeline and is positioned between the first one-way valve and the heating element;

and/or, the power P of the heating element meets the following conditions: p is more than or equal to 1300W and less than or equal to 1600W.

Optionally, the coffee machine further comprises a second one-way valve, the second one-way valve is arranged between the liquid level stabilizing module and the heating element, and the conducting direction of the second one-way valve is configured to be from the liquid level stabilizing module to the direction of the pipeline.

Optionally, when the float assembly seals the water inlet, a distance H1 between the liquid level in the housing and the second one-way valve, a distance H2 between the liquid level in the housing and the first one-way valve, and a distance H3 between the liquid level in the housing and a plane in which the water outlet of the pipe is located satisfy: h1 And more than or equal to H3-H2.

Optionally, the second check valve is configured as a no opening pressure check valve.

Optionally, the pipe has a pipe portion in which the internal liquid flows upward, and the heat generating member is provided at least on the pipe portion.

Optionally, the heating element is in an L-shape.

Optionally, the float assembly comprises a float body provided in the housing and capable of having a first state of sealing the water inlet and a second state of opening the water inlet under buoyancy.

Optionally, the maximum buoyancy value of the float body is 2 to 5 times of the self weight of the float body;

and/or the ratio of the cross-sectional area of the shell to the cross-sectional area of the float body is s, and s is more than or equal to 1.2 and less than or equal to 3.

Optionally, 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 stabilizing module.

According to the technical scheme, the first one-way valve is arranged between the heating element and the brewing module, the conducting direction of the first one-way valve is configured to be from the pipeline towards the direction of the brewing module, when the temperature of hot water reaches the preset temperature, the hot water can flow through the first one-way valve and towards the brewing module, and the hot water flowing to the brewing module can be limited by the first one-way valve to fall back into the pipeline corresponding to the heating element, so that the possibility that the water temperature is too high, the water vapor is increased and the water quantity is reduced due to repeated heating can be effectively reduced, and the water outlet temperature and the water outlet quantity are ensured.

The float assembly is repeatedly switched between the first state and the second state in a circulating way, liquid in the water tank continuously flows into the pipeline corresponding to the heating element, and through the cooperation of the heating element and the first one-way valve, on one hand, the outlet water temperature can reach the designated temperature, the taste of brewed coffee is guaranteed, on the other hand, the generated hot water reliably flows to the brewing module, the outlet water flow of the coffee machine is further effectively controlled, the time for flowing water in the water tank is shortened, and the requirement of ECBC (European coffee brewing center) on the outlet water duration is met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a coffee machine according to an embodiment of the present invention;

fig. 2 is a schematic diagram of the liquid flow direction of the coffee maker of fig. 1.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				10	Water tank module	411	First pipe section
11	Water tank	412	Second pipe section
				20	Liquid level stabilizing module	413	Third pipe section
21	Shell body	421	First heating element
				22	Float assembly	422	Second heating element
30	Brewing module	51	First one-way valve
				31	Powder bin	52	Second one-way valve
32	Water-steam separator	60	Liquid receiving module
				40	Heating module	70	Thermal insulation module
41	Pipeline

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "a and/or B", including a scheme, or B scheme, or a scheme that is satisfied by both a and B. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The invention provides a coffee machine.

Referring to fig. 1, in the embodiment of the present invention, the coffee maker includes a water tank 11, a liquid level stabilizing module 20, a brewing module 30, a pipe 41, a heating element and a first check valve 51, wherein the water tank 11 is provided with a water tank water outlet; the liquid level stabilizing module 20 comprises a shell 21 and a float assembly 22, wherein the shell 21 is provided with a water inlet communicated with a water outlet of the water tank, a first outlet and a second outlet, the second outlet is communicated with the atmosphere, and the float assembly 22 is used for opening or closing the water inlet; the conduit 41 communicates the first outlet communication with the brew module 30; the heating element is arranged on the pipeline 41; the first check valve 51 is disposed in the pipe 41 and between the heating element and the brewing module 30, and the conducting direction of the first check valve 51 is configured to be from the pipe 41 toward the direction of the brewing module 30, so that the water outlet time period when the water in the water tank 11 flows out can be shortened while the water outlet temperature is ensured.

The coffee machine comprises 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, namely, a shell 21 is communicated with a water tank 11 and a pipeline 41; the brewing module 30 is connected with the heating module 40, that is, the water-vapor separation device 32 of the brewing module 30 is communicated with the pipeline 41, so that 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, and in the process, the water is heated by the heating element, so that the hot water is ensured to flow into the powder bin 31 of the brewing module 30 and is dissolved with coffee powder in the powder bin 31; the coffee formed by brewing flows into the liquid receiving module 60, such as a coffee cup, wherein a 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 quality of the coffee.

The liquid level stabilizing module 20 comprises a shell 21, wherein the shell 21 is provided with a water inlet which is communicated with a water outlet of the water tank, and it can be understood that the water inlet and the water outlet of the water tank can be the same water passing port, namely, the shell 21 is directly covered on the edge of the water outlet of the water tank and forms a cavity capable of storing water with the wall surface of the water tank 11; alternatively, the water inlet and the water outlet of the water tank are connected by a water receiving pipe, and the housing 21 may be located at a side portion of the water tank 11, which may be a left side portion, a bottom portion, or a top portion, which is not limited herein.

The heating element is provided on the pipe 41, and it is understood that the heating element may be coated on the outer circumferential surface of the pipe 41 or may be attached to the inner wall surface of the pipe 41, so that the water flow in the pipe 41 corresponding to the heating element can be sufficiently heated, and the water temperature can be ensured to rise.

The liquid level stabilizing module 20 is arranged between the water tank 11 and the pipeline 41, the liquid level stabilizing module 20 is communicated with the water tank 11, the pipeline 41 is communicated with the water-vapor separating device 32 in the brewing module 30, the second outlet of the shell 21 is communicated with the atmosphere, the water-vapor separating device 32 is communicated with the atmosphere, water in the water tank 11 flows through the shell 21 and flows to the pipeline 41, and therefore the liquid level in the pipeline 41 and the liquid level in the shell 21 are maintained at the same level.

Because the float assembly 22 is arranged in the shell 21 and the float assembly 22 is used for opening or closing the water inlet, it can be understood that the float assembly 22 can move relative to the shell 21 under the action of the buoyancy of water, further has a first state for sealing the water inlet and a second state for opening the water inlet, and ensures stable water outlet of the water tank 11 by controlling the water outlet flow of the water tank 11, so that the liquid level in the pipeline 41 and the liquid level in the shell 21 are always maintained at the same level, further, the liquid level in the pipeline 41 can be maintained at an approximately constant position, the stay time of water flow in the pipeline 41 is prolonged, the water flow in the pipeline 41 corresponding to the heating element can be fully heated by the heat emitted by the heating element, and the water temperature of the water flow flowing out of the heating element is ensured to be approximately constant.

After heating for a certain time, the water in the pipeline 41 is heated to generate steam pressure, and then the water flow in the pipeline 41 flows into the powder bin 31 of the brewing module 30 under the action of steam pressure; when the pipeline 41 between the heating element and the brewing module 30 is too long, the generated pressure is insufficient to support the complete ejection of hot water, and part of hot water flowing to the brewing module 30 is easily caused to fall back to the heating module 40 for repeated heating, so that the outlet water temperature, the outlet water quantity and the outlet water time length are influenced, therefore, the first one-way valve 51 is arranged between the heating element and the brewing module 30 and is arranged on the pipeline 41 and between the heating element and the brewing module 30, wherein the conducting direction of the first one-way valve 51 is configured to be from the pipeline 41 towards the brewing module 30, so that water flow in the pipeline 41 can flow into the powder bin 31 of the brewing module 30 under the action of vapor pressure, specifically, when the hot water temperature reaches the preset temperature, the hot water can flow through the first one-way valve 51 and towards the brewing module 30 by utilizing the vapor pressure generated by heating, and the hot water flowing back to the pipeline 41 corresponding to the heating element can be limited, so that the water temperature excessively high caused by repeated heating can be effectively reduced, the water vapor temperature can be increased, and the outlet water quantity can be guaranteed; further, the float assembly 22 is repeatedly switched between the first state and the second state, so that the liquid in the water tank 11 is continuously flowed into the pipeline 41 corresponding to the heating element, and the water outlet temperature can reach the designated temperature, for example, 92 ℃ to 996 ℃ through the cooperation of the heating element and the first one-way valve 51, so that the brewed coffee has better taste, on the other hand, the generated hot water reliably flows to the brewing module 30, the water outlet flow of the coffee machine is reliably controlled, the time for flowing out the water in the water tank 11 is shortened, and the requirements of ECBC (European coffee brewing center) on the water outlet time are met.

In the technical scheme of the invention, the first one-way valve 51 is arranged between the heating element and the brewing module 30, the conduction direction of the first one-way valve 51 is configured to be from the pipeline 41 towards the brewing module 30, when the temperature of the hot water reaches the preset temperature, the hot water can flow through the first one-way valve 51 and towards the brewing module 30, and the first one-way valve 51 can limit the hot water flowing to the brewing module 30 to fall back into the pipeline 41 corresponding to the heating element, so that the possibility that the water temperature is too high, the water vapor is increased and the water quantity is reduced due to repeated heating can be effectively reduced, and the water outlet temperature and the water outlet quantity are ensured.

The float assembly 22 is repeatedly switched between the first state and the second state, the liquid in the water tank 11 continuously flows into the pipeline 41 corresponding to the heating element, and through the cooperation of the heating element and the first one-way valve 51, on one hand, the outlet water temperature can reach the designated temperature, the taste of the brewed coffee is ensured, on the other hand, the generated hot water reliably flows to the brewing module 30, the outlet water flow of the coffee machine is further effectively controlled, the time for flowing out the water in the water tank 11 is shortened, and the requirements of ECBC (European coffee brewing center) on the outlet water duration are met.

Referring to FIG. 2, in one embodiment, when the float assembly 22 seals the water inlet, in the vertical direction of the coffee machine, the height difference between the liquid level in the housing 21 and the first check valve 51 is H2, 10mm < H2 < 20mm, and by defining the height difference between the liquid level in the housing 21 and the first check valve 51 in the vertical direction of the coffee machine, the water outlet temperature of the conduit 41, i.e., the temperature of the water exiting the water-vapor separation device 32, can be further ensured by defining the steam pressure corresponding to the desired water outlet temperature.

Specifically, in the vertical direction of the coffee machine, by limiting the difference between the liquid level in the housing 21 and the first check valve 51 to between 10mm and 20mm, it is ensured that water flow can flow through the first check valve 51 under the action of vapor pressure, and further hot water with a water outlet temperature of 95 ℃ and above and a proper amount of water outlet are obtained, thereby ensuring the brewing quality of coffee. The difference between the height of the liquid surface in the housing 21 and the height of the first check valve 51 is preferably 10mm. Of course, in other embodiments, the difference between the height of the liquid surface in the housing 21 and the height of the first check valve 51 may be defined between 5mm and 15mm, or between 15mm and 25mm, depending on the requirement of the outlet water temperature.

Optionally, in an embodiment, the coffee machine further includes a water outlet pipe, where the water outlet pipe is in communication with the pipe 41 and is located between the first check valve 51 and the heating element, so that the pipe 41 between the first check valve 51 and the heating element is ensured to be in communication with the atmosphere, and when the first check valve 51 is closed, by using the arrangement of the water outlet pipe in communication with the atmosphere, the pressure between the first check valve 51 and the heating element can be reduced, the influence of the pressure on the first outlet of the liquid level stabilizing module 20 is weakened, the water flow in the liquid level stabilizing module 20 can be ensured to be smoothly supplemented to the pipe 41, so that the liquid level in the pipe 41 is maintained at an approximately constant position, the possibility of dry burning is reduced while the water temperature of the water flow flowing out of the heating element is ensured to be approximately constant, and the use safety is improved.

Optionally, in an embodiment, the power P of the heat generating element satisfies: 1300W is less than or equal to P is less than or equal to 1600W, so that the power P of the heating element can be controlled between 1300W and 1600W, and the heating speed and the heating time of the heating module 40 on water flow can be controlled.

Referring to fig. 2, in an embodiment, the coffee machine further includes a second check valve 52, where the second check valve 52 is disposed between the liquid level stabilizing module 20 and the heat generating component, and a conducting direction of the second check valve 52 is configured to be a direction from the liquid level stabilizing module 20 toward the pipe 41, so as to control a flow direction of the water flow, and prevent the water flow in the pipe 41 from flowing back to the liquid level stabilizing module 20 under a steam pressure; it is also possible to prevent the vapor pressure in the pipe 41 from blocking the outlet of the second check valve 52, specifically, by disposing the second check valve 52 at a position close to the inlet of the pipe 41 corresponding to the heat generating member, at this time, since the distance H1 between the first outlet of the liquid level stabilizing module 20 and the second check valve 52 is large, the water pressure is large, so that the water in the liquid level stabilizing module 20 flows into the pipe 41 and is heated by the heat generating member.

Referring to fig. 2, in an embodiment, when the float assembly 22 seals the water inlet, a distance H1 between the liquid surface in the housing 21 and the second check valve 52, a distance H2 between the liquid surface in the housing 21 and the first check valve 51, and a distance H3 between the liquid surface in the housing 21 and a plane in which the water outlet of the pipe 41 is located satisfy: h1 Not less than H3-H2, so that the reverse blocking of the second one-way valve 52 caused by the overlarge pressure between the first one-way valve 51 and the liquid level can be avoided, and the water in the liquid level stabilizing module 20 can be ensured to be smoothly supplemented into the pipeline 41; in other words, when the difference between H3 and H2 is too large, the pressure between the first check valve 51 and the liquid level is too large, and then the pressure acts on the outlet of the second check valve 52 in a reverse direction, so that the second check valve 52 is in an approximately closed or closed state, and then the water flow of the pipe 41 corresponding to the heating element through the second check valve 52 is less, even the flow is zero, and the possibility of dry burning is very easy to occur.

Further, in an embodiment, the second check valve 52 is configured as a non-opening pressure check valve, that is, during the process of flowing the water from the liquid level stabilizing module 20 to the pipe 41, the second check valve 52 corresponds to one of the pipes 41, so that the water can smoothly flow through the second check valve 52 without blocking, which is beneficial to improving the efficiency of supplementing to the pipe 41.

The opening pressure of the first check valve 51 depends on the outlet water temperature requirement, for example, the outlet water temperature is 95 ℃ and above 95 ℃, and the opening pressure is the pressure generated by heating the water to 95 ℃ and above 95 ℃, so as to ensure that the temperature of the water flowing through the first check valve 51 reaches 95 ℃ and above 95 ℃, and further ensure the brewing quality of the coffee. Further, the reverse cut-off pressures of the first check valve 51 and the second check valve 52 are different.

Referring to fig. 2, in an embodiment, the pipe 41 has a pipe portion in which the liquid flows upward, and the heat generating member 42 is disposed at least on the pipe portion, and it is understood that the pipe 41 includes a first pipe section 411 and a second pipe section 412, both extending upward and downward and being connected, the first pipe section 411 being in communication with the first outlet, the second pipe section 412 being in communication with the brewing module 30, wherein the liquid in the second pipe section 412 flows upward and toward the brewing module 30, and the first pipe section 411 and the second pipe section 412 may be directly connected, or may be connected by other pipe sections, without limitation; the heating element comprises a first heating element 421 arranged on the second pipe section 412, and the first one-way valve 51 is arranged on the second pipe section 412 and is higher than the upper end of the heating element; in this way, after 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 flow flows into the powder bin 31 of the brewing module 30, the water in the pipeline 41 is effectively prevented from flowing backwards due to the steam pressure, and the steam pressure is prevented from acting on the first outlet or the second one-way valve 52, so that the stable outflow of the water in the liquid level stabilizing module 20 or the water tank 11 is influenced; make things convenient for the outflow of the water in the water tank 11 to supply to second pipeline section 412, make the liquid level of the water in the second pipeline section 412 comparatively invariable, when guaranteeing to flow the temperature of the rivers of heating element roughly invariable, reduce the possibility that appears dry combustion method, promote the safety in utilization.

Further, in an embodiment, the pipe 41 further comprises a third pipe section 413, the third pipe section 413 being connected to the first pipe section 411 and the second pipe section 412; the heating element further comprises a second heating element 422, the second heating element 422 is arranged on the third pipe section 413 and is far away from the first pipe section 411, at this time, the second one-way valve 52 can be arranged on the third pipe section 413, can also be arranged on the first pipe section 411 and is 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 the water flow in the liquid level stabilizing module 20 is reduced. Meanwhile, by arranging the second heating element 422 on the third pipe section 413, the length of the pipe 41 capable of heating can be prolonged, which is beneficial to increasing the heated area of water in the pipe 41 and the formed hot water quantity. The third tube section 413 may extend in a serpentine manner or may extend in a straight line.

Still further, the heating element is in an L-shaped configuration, where the first heating element 421 and the second heating element 422 are integrally configured, which is favorable for reducing the assembly process, and avoiding the generation of a gap between the first heating element 421 and the second heating element 422, which results in that the water flow in the pipe 4141 corresponding to the gap is not effectively heated, and 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.

Optionally, in an embodiment, the float assembly 22 comprises a float body provided inside the housing 21 and capable of having, under buoyancy, a first condition sealing the water inlet and a second condition opening the water inlet; it will be appreciated that when water in the water tank 11 flows into the housing 21 through the water inlet, the float body rises with the rise of the liquid level when the liquid level in the housing 21 rises gradually, and when the liquid level rises to a certain height, the float body is aligned with the water inlet and seals the water inlet to be in the first state, at this time, the liquid level in the housing 21 is in a stable state, and at the same time, the liquid level in the pipe 41 is in the same level as the liquid level in the housing 21; when the water flow in the pipeline 41 is heated, the generated steam pressure enables the water flow in the pipeline 41 to at least partially flow into the powder bin 31 in the brewing module 30, the liquid level in the pipeline 41 in the liquid level stabilizing module 20 is reduced due to the change of the pressure in the pipeline 41 and the reduction of the water quantity, the liquid level in the shell 21 is reduced, the float body falls along with the reduction of the liquid level, when the water falls to be separated from the water inlet, the float body does not block the water inlet and is in the second state, at the moment, the water in the water tank 11 flows into the shell 21, the liquid level is enabled to rise, the float body is driven to reseal the water inlet, the first state and the second state are repeatedly switched in a circulating mode, the liquid level in the pipeline 41 is ensured to be always at a constant height, the retention time of the water flow in the pipeline 41 is ensured, and the heat emitted by the heating element can fully heat the water flow in the pipeline 41 corresponding to the heating element, and the water temperature of the water flow flowing out of the heating element is ensured to be approximately constant. The float body may be configured as a float valve. The float body is slidably connected to the shell 21, and the sliding direction is along the axis direction of the water inlet, so that the first state and the second state can be effectively switched by matching with the action direction of the buoyancy; the float body is rotatably connected to the housing 21, and its rotation direction matches the direction of action of the buoyancy to achieve switching between the first state and the second state.

The buoyancy of the float body can be designed according to the choice of the liquid level position in the shell 21, so as to change the liquid level of the water flow in the pipeline 41, thereby determining the setting height of the first heating element 421 in the second pipe section 412.

Optionally, in an embodiment, the float body is subjected to a maximum buoyancy value of 2 to 5 times the self weight of the float body; the maximum buoyancy value refers to a buoyancy value generated when the float body is completely immersed, when the buoyancy force borne by the float body is too small, the immersion volume of the float body is larger because of the heavier float body, and furthermore, when the water shortage detection device in the coffee machine is connected with the float body, the water shortage detection device is easy to trigger to work by mistake, and the detection accuracy of the water shortage detection device is affected; when the buoyancy that the float body received is too big, the submergence volume of float body is less, and because of buoyancy is too big to lead to in supplementing a small amount of water to casing 21 after the float body just blocks up the water inlet, and then lead to the liquid level in the casing 21 to be in lower water level all the time, influence the drainage ability of liquid level stabilization module 20 and the float body to the switching number of times of water inlet easily, the water level variation in the casing 21 is unobvious, consequently, through limiting the biggest buoyancy value that the float body received to 2 to 5 times of the dead weight of float body, can guarantee the detection reliability of later stage water shortage detection device to the water shortage condition of coffee machine, and guarantee drainage ability and the play water stability of liquid level stabilization module 20.

The ratio between the maximum buoyancy value of the float body and 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, and the like, and is preferably 2.7 times.

Optionally, in an embodiment, the ratio between the cross-sectional area of the housing 21 and the cross-sectional area of the float body is s,1.2 is less than or equal to 3, so that a larger water containing space is provided in the housing 21, and meanwhile, in the switching process of the first state and the second state, the float body is ensured to float and sink smoothly in the housing 21, so that the water outlet reliability of the liquid level stabilizing module 20 is improved, and the assembly of the detected piece on the float body and the cooperation with the reed switch, the hall sensor and the like are facilitated, so that the detection precision of the water shortage detecting device is improved.

The specific ratio between the cross-sectional area of the housing 21 and the cross-sectional area of the float body may 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.

Optionally, in an embodiment, the coffee machine further includes a water shortage detection device, where the water shortage detection device is disposed in the water tank 11 and/or the liquid level stabilizing module 20, so as to send out corresponding signals and warnings when the water tank 11 or the housing 21 is in a water shortage state, and cut off the power supply to the heating element, so as to prevent dry burning.

Specifically, the water shortage detection device can monitor the water level through a reed pipe or a Hall sensor, capacitance detection, infrared detection and the like which are matched with the magnet.

The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (11)

1. A coffee machine, comprising:

the water tank is provided with a water tank water outlet;

the liquid level stabilizing module comprises a shell and a float assembly, wherein the shell is provided with a water inlet communicated with a water outlet of the water tank, a first outlet and a second outlet, the second outlet is communicated with the atmosphere, and the float assembly is used for opening or closing the water inlet;

a brewing module and a conduit communicating the first outlet communication with the brewing module;

the heating piece is arranged on the pipeline; and

the first one-way valve is arranged in the pipeline and positioned between the heating piece and the brewing module, and the conducting direction of the first one-way valve is configured to be from the pipeline to the direction of the brewing module.

2. The coffee machine of claim 1, wherein a height difference between a liquid surface in the housing and the first check valve in an upright direction of the coffee machine is H2, 10mm ∈h2 ∈20mm when the float assembly seals the water inlet.

3. The coffee machine of claim 1, further comprising a water outlet pipe in communication with the conduit and located between the first one-way valve and the heat generating element;

and/or, the power P of the heating element meets the following conditions: p is more than or equal to 1300W and less than or equal to 1600W.

4. The coffee machine of claim 1, further comprising a second one-way valve disposed between the liquid level stabilizing module and the heat generating member, a direction of conduction of the second one-way valve being configured to be from the liquid level stabilizing module toward a direction of a conduit.

5. The coffee machine of claim 4, wherein when the float assembly seals the water inlet, a distance H1 between the liquid level in the housing and the second one-way valve, a distance H2 between the liquid level in the housing and the first one-way valve, and a distance H3 between the liquid level in the housing and a plane in which the water outlet of the conduit lies satisfy: h1 And more than or equal to H3-H2.

6. The coffee machine of claim 4, wherein the second check valve is configured as a non-cracking pressure check valve.

7. Coffee machine according to any one of claims 1 to 6, wherein said duct has a duct portion in which the internal liquid flows upwards, said heat generating element being provided at least on said duct portion.

8. The coffee machine of claim 7, wherein the heat generating element is L-shaped.

9. A coffee machine as claimed in claim 1, wherein said float assembly comprises a float body provided in said housing and capable of, under buoyancy, having a first condition sealing said water inlet and a second condition opening said water inlet.

10. A coffee machine as claimed in claim 9, wherein said float body is subjected to a maximum buoyancy value of 2 to 5 times the dead weight of said float body;

and/or the ratio of the cross-sectional area of the shell to the cross-sectional area of the float body is s, and s is more than or equal to 1.2 and less than or equal to 3.

11. The coffee machine of claim 1, further comprising a water shortage detection device provided to the water tank and/or the level stabilizing module.