Concentration adjusting device of coffee machine and coffee machine

Abstract

The coffee machine comprises a main machine and a kettle body, the main machine is provided with an extraction assembly, and a valve rod is arranged at a liquid outlet of the extraction assembly; a limiting piece is arranged around the liquid outlet, and an opening is formed in the limiting piece; a kettle cover of the kettle body is provided with a limiting part capable of penetrating through the opening; the limiting part is matched with the opening, so that the kettle body can only be placed at a first angle; the lower end of the valve rod is provided with a head which is provided with a guide face, and the open end and the tail end of the guide face form a height difference. The kettle cover is provided with a liquid inlet, and the limiting part is provided with a convex part corresponding to the guide surface. The kettle body rotates in the position of the main machine, the stroke of the valve rod can be controlled so as to adjust the extraction time of coffee, and a user can make coffee suitable for himself or herself according to different taste requirements; and after the liquid outlet is closed, the kettle body can be pulled out, so that coffee is effectively prevented from dripping onto the heating disc.

Description

Technical Field

[0001] This invention relates to the field of coffee machine technology, and more specifically to a coffee machine concentration adjustment device and a coffee machine. Background Technology

[0002] Currently, most American drip coffee machines on the market have simple structures and few models have adjustable coffee concentration. Common solutions include adding manual control buttons or adding electronic control valves and sensors. This electronic control method makes the structure of American drip coffee machines complex and increases equipment costs. In addition, the coffee outlet under the filter basket of common American drip coffee machines usually uses a simple valve stem structure. During coffee making, the lid of the glass pot opens the valve stem, allowing coffee to flow smoothly into the glass pot. If there is still coffee in the filter basket during the coffee making process, and the glass pot is removed, the valve stem closes as the glass pot is removed. However, the valve stem has a certain closing stroke, and a small amount of coffee will drip onto the heating plate during the closing process, requiring subsequent cleaning and maintenance. Simply adjusting the spring force or stroke can slightly improve the problem, but it will not completely solve the dripping problem and will still affect the user experience. Summary of the Invention

[0003] In view of this, the present invention provides a coffee concentration adjustment device and a coffee machine.

[0004] To achieve the above objectives, the first aspect of the present invention provides a concentration adjustment device for a coffee machine. The coffee machine includes a main unit and a pot body. The main unit is equipped with an extraction component. The main unit is positioned below the extraction component to place the pot body. A valve stem is provided at the outlet of the extraction component. The valve stem is connected to an elastic element. The elastic force of the elastic element causes the valve stem to block the outlet. A limiting element is provided around the liquid outlet, and the limiting element has an opening; The lid of the kettle body is provided with a limiting part that can pass through the opening; the limiting part and the opening cooperate to ensure that the kettle body can only be placed in the first angle position; The lower end of the valve stem is provided with a head, which is located within the space surrounded by the limiting member. The head is provided with a guide surface, and the opening and closing ends of the guide surface form a height difference. The lid of the pot body is provided with an inlet corresponding to the outlet. The limiting part is provided with a protrusion corresponding to the guide surface. When the pot body rotates in the position, the protrusion moves from the opening end to the closing end of the guide surface, causing the outlet to gradually open.

[0005] As a preferred embodiment of the present invention, the lid is provided with an arc-shaped, upwardly arched limiting part in the middle, and the limiting part has the liquid inlet.

[0006] In a preferred embodiment of the present invention, the limiting member includes: a first limiting member and a second limiting member arranged in an arc shape, wherein the opening is formed between the opening ends of the first limiting member and the second limiting member; the inner wall surfaces of the first limiting member and the second limiting member are arranged in an arc shape.

[0007] In a preferred embodiment of the present invention, the inner wall of the first limiting member is provided with a first limiting rod; the inner wall of the second limiting member is provided with a second limiting rod; when the protrusion moves from the beginning to the end of the guide surface, the first limiting rod or the second limiting rod abuts against the side of the limiting part.

[0008] In a preferred embodiment of the present invention, a boss is provided in the middle of the lid, and a limiting part is provided on the top of the boss; the side of the boss is arc-shaped.

[0009] In a preferred embodiment of the present invention, the lower edge of the boss is connected to the outer edge of the lid by an arc-shaped concave surface, and a return port is provided at the connection between the lower edge of the boss and the concave surface.

[0010] In a preferred embodiment of the present invention, the upper end of the valve stem is provided with a sealing part, which is used to seal the liquid outlet.

[0011] In a preferred embodiment of the present invention, a rod is provided between the sealing part and the head; the head is provided with a concave part, and a liquid hole is provided in the concave part, the diameter of which is less than or equal to the diameter of the liquid inlet.

[0012] A second aspect of the present invention provides a coffee machine including the above-described concentration adjustment device.

[0013] In a preferred embodiment of the present invention, a heating plate is provided at the location of the host unit.

[0014] As can be seen from the above technical solution, compared with the prior art, the present invention has the following beneficial technical effects: the present invention can control the stroke of the valve rod by rotating the pot body in the position of the main unit, so as to adjust the extraction time of coffee, and users can make coffee that suits their own taste needs according to different taste needs; As the pot body rotates within the main unit, gradually changing the outlet from its fully open state to its closed state, there is sufficient time for the coffee at the outlet to drain completely. Through the cooperation of the limiting component and the limiting part, the pot body can only be moved and pulled out when it rotates to the first angle. Therefore, the pot body can only be pulled out after the outlet is closed, effectively preventing coffee from dripping onto the heating plate.

[0015] The remaining beneficial technical effects of the present invention are reflected in the specific embodiments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the coffee machine. Figure 2 This is a cross-sectional view of a coffee machine; Figure 3 This is a schematic diagram of the coffee pot in a coffee machine; Figure 4 This is a diagram of the lid of a coffee pot in a coffee machine. Figure 5 This is a diagram showing the main unit of a coffee machine in an inverted position. Figure 6 This is a schematic diagram of the valve stem in a coffee machine. Figure 7 for Figure 2 Enlarged view of point A in the middle.

[0018] Explanation of reference numerals in the attached figures Main unit 100; Position 101; Filter chamber 102; Limiting component 110; First limiting component 111; First limiting rod 1111; Second limiting component 112; Second limiting rod 1112; Opening 113; Heating plate 120; Pot body 200; Liquid inlet 201; Protrusion 202; Return port 203; Pot lid 210; Limiting part 220; Boss 230; Concave surface 240; Extraction component 300; Liquid outlet 301; Valve stem 400; Elastic component 500; Head 410; Guide surface 411; Liquid hole 412; Concave position 413; Sealing part 420; Rod body 430. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0020] In the description of this application, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] Example 1 For the coffee machine's concentration adjustment device, please refer to [link / reference]. Figure 1 As shown, the coffee machine includes a main unit 100 and a pot body 200. The pot body 200 can be placed in and removed from the main unit 100. The coffee machine is mainly used for making coffee.

[0023] like Figure 1-2 As shown, the main unit 100 has a machine head, in which an extraction component 300 is provided. The main unit 100 has a position 101 for placing a pot body 200 below the extraction component 300. The pot body 200 can be placed in the position 101 to hold the extracted coffee and can be removed from the position 101.

[0024] like Figure 2 As shown, a valve stem 400 is provided at the outlet 301 of the extraction component 300. The valve stem 400 is connected to an elastic element 500. The elastic element 500 provides a downward elastic force to the valve stem 400, and the elastic force of the elastic element 500 causes the valve stem 400 to block the outlet 301.

[0025] like Figure 6 As shown, Figure 6 The valve stem 400 is at an inverted angle. The valve stem 400 has a head 410, a plugging part 420 and a stem body 430, with the stem body 430 connected between the head 410 and the plugging part 420. The valve stem 400 is used to control the opening / closing of the outlet 301. The elastic element 500 provides a downward elastic force to the valve stem 400, so that the sealing part 420 seals the outlet 301. Under external force, the valve stem 400 moves upward, so that the sealing part 420 leaves the outlet 301, the outlet 301 is opened, and the extracted coffee flows downward from the outlet 301.

[0026] The head 410, the sealing part 420 and the rod 430 can be separate structures. Preferably, the head 410, the sealing part 420 and the rod 430 are integrally formed structures. The elastic element 500 is a spring. One end of the spring is limited to the head 410 and the other end is supported on a certain wall of the housing to provide the downward elastic force of the valve rod 400 so that the sealing part 420 blocks the liquid outlet 301.

[0027] Furthermore, such as Figure 7 As shown, the head 410 is provided with a concave part 413, and the concave part 413 is provided with a liquid hole 412, through which the coffee flows downward. The main unit 100 has a filter chamber 102 at its head for installing the extraction component 300. The filter chamber 102 is cone-shaped, and the extraction component 300 is installed inside the filter chamber 102. The extraction component 300 includes a filter cup and a filter basket installed in the filter cup. When in use, coffee powder is added to the filter basket, and the nozzle of the main unit 100 sprays hot water from top to bottom into the filter basket. The hot water flows downward, and coffee is extracted during this process.

[0028] like Figure 5 As shown, a limiting member 110 is provided around the liquid outlet 301 on the outer casing of the main unit 100, and the limiting member 110 is provided with an opening 113; like Figure 3 As shown, the lid 210 of the pot body 200 is provided with a limiting part 220 that can pass through the opening 113; the limiting part 220 and the opening 113 cooperate to ensure that the pot body 200 can only be placed into position 101 at a first angle and removed from position 101 at a first angle; at other angles, the limiting part 220 of the pot body 200 will abut against the limiting member 110, making it impossible to correctly place or remove the pot body 200.

[0029] The head 410 is located within the space surrounded by the limiting member 110. The head 410 is provided with a guide surface 411. The opening A and the closing B of the guide surface 411 form a height difference. The guide surface 411 is arc-shaped. The lid 210 of the pot body 200 is provided with an inlet 201 corresponding to the liquid outlet 301. The limiting part 220 is provided with a protrusion 202 corresponding to the guide surface 411. When the pot body 200 rotates in position 101, the protrusion 202 moves from the opening to the closing end of the guide surface 411, causing the liquid outlet 301 to gradually open. In addition, the diameter of the liquid hole 412 is smaller than or equal to the diameter of the liquid inlet 201, further ensuring that coffee flows into the pot body 200; Specifically, the limiting member 110 includes: a first limiting member 111 and a second limiting member 112 with an arc shape, and an opening 113 is provided between the openings of the first limiting member 111 and the second limiting member 112; the inner wall surfaces of the first limiting member 111 and the second limiting member 112 are arc-shaped; a boss 230 is provided in the middle of the lid 210, and an arc-shaped, upwardly arched limiting part 220 is provided on the top of the boss 230. The limiting part 220 has a liquid inlet 201. The side of the boss 230 is arc-shaped, which, in conjunction with the arc of the first limiting member 111 and the second limiting member 112, makes the rotation of the pot body 200 smoother and avoids interference.

[0030] When the pot body 200 is at the first angle, the limiting part 220 is directly opposite the opening 113, pushing the pot body 200 into position 101. The limiting part 220 passes through the opening 113 and enters the space enclosed by the limiting member 110.

[0031] Furthermore, when the kettle body 100 is placed in position 101 at the first angle, the protrusion 202 is located at the beginning of the guide surface 411 (i.e., the high end), and at this time the valve stem 400 is not lifted. When the pot body 200 rotates in the forward direction, the protrusion 202 moves from the beginning (high end) to the end (low end) of the guide surface 411, the valve stem 400 is lifted, causing the liquid outlet 301 to gradually open, the coffee flows downward along the rod body 430, and the liquid outlet 301, liquid hole 412 and liquid inlet 201 enter the pot body 200.

[0032] The lifting height of the valve stem 400 is determined based on the rotation angle of the kettle body 200, thereby controlling the size of the liquid outlet 301. When the protrusion 202 moves to the end of the guide surface 411, the opening of the liquid outlet 301 is at its maximum.

[0033] like Figure 2 and Figure 4 As shown, the guide surface 411 is provided with two sections, and the protrusions 202 are provided with two corresponding sections, so that the valve stem 400 rises stably.

[0034] To prevent the kettle body 200 from rotating excessively and to ensure that the protrusion 202 can be limited when it moves to the end of the guide surface 411, a first limiting rod 1111 is provided on the inner wall of the first limiting member 111; a second limiting rod 1112 is provided on the inner wall of the second limiting member 112; when the protrusion 202 moves from the beginning to the end of the guide surface 411, the first limiting rod 1111 or the second limiting rod 1112 abuts against the side of the limiting part 220.

[0035] After the pot body 200 is placed in position 101 at the first angle, the protrusion 202 corresponds to the beginning of the guide surface 411, and the first limiting rod 1111 of the first limiting member 111 abuts against the side of the limiting part 220 to prevent the pot body 200 from rotating in the opposite direction, so that the pot body 200 can only rotate correctly. When the kettle body 200 rotates to the point where the protrusion 202 abuts against the end of the guide surface 411, the second limiting rod 1112 of the second limiting member 112 abuts against the side of the limiting part 220, and the kettle body 200 has rotated to the maximum angle, so that the liquid outlet 301 is kept in the maximum opening state.

[0036] When the kettle body 200 rotates in the reverse direction to close the liquid outlet 301, the first limiting rod 1111 of the first limiting member 111 abuts against the side of the limiting part 220 again, the liquid outlet 301 closes, and the kettle body 200 can be correctly pulled out from the first position 101.

[0037] The lower edge of the boss 230 is connected to the outer edge of the lid 210 by an arc-shaped concave surface 240. A return port 203 is provided at the connection between the lower edge of the boss 230 and the concave surface 240. When some coffee does not enter the pot body 200 from the inlet 201, it can flow into the pot body 200 through the return port 203.

[0038] like Figure 6 As shown, there are four outlet holes 412. Therefore, the diameter of the outlet holes 412 is preferably smaller than the diameter of the inlet 201. By setting the diameter of the outlet holes 412, all coffee can enter the pot body 200 through the inlet 201 as much as possible. During use, if the coffee does not enter the pot body 200 through the inlet 201, the coffee can also flow into the pot body 200 through the return port 203.

[0039] For example, by designing the length of the guide surface 411, the maximum rotation angle of the pot body 200 is set to 45°. That is, after the pot body 200 is placed at position 101 at the first angle, it can only rotate 45° forward to open the outlet 201 to its maximum position, at which point the valve stem 400 has its maximum opening stroke. When the pot body 200 returns to the first angle, the valve stem 400 closes the outlet 301. During this process, the cross-sectional area of ​​the outlet 301 is linearly and steplessly adjusted. In actual use, considering the different needs of different people for coffee flavor and taste, the concentration adjustment device of this invention can control the movement stroke of the valve stem 400 by swinging the angle of the pot body 200, thereby controlling the opening size of the outlet 301, adjusting the dispensing speed, controlling the contact time between hot water and coffee powder, and achieving different extraction rate requirements. Example 2

[0040] A coffee machine includes the concentration adjustment device of claim 1, wherein a heating plate 120 is provided at position 101 of the main unit 100, and the heating plate 120 mainly heats the coffee in the pot body 200.

[0041] For example, the host 100 should also include: a water tank, a water pump, a heating device for heating water, etc.

[0042] When the kettle body 200 is pushed into position 101 at the first angle, the valve stem 400 is not lifted, the liquid outlet 301 is not opened, and the coffee does not flow downward. After the pot body 200 is pushed into position 101, rotate the pot body 200 in the forward direction to open the liquid outlet 301, and the coffee flows downward and into the pot body 200; After obtaining enough coffee, rotate the pot body 200 in both directions to close the outlet 301. The outlet 301 closes gradually, allowing enough time for the coffee at the outlet 301 to flow out completely into the pot body 200. Alternatively, after the outlet 301 is closed, you can leave the pot body 200 for a few seconds before removing it, ensuring that all the coffee flows into the pot body 200 and preventing coffee from dripping onto the heating plate 120, which would affect its use.

[0043] During use, users can adjust the angle of the pot body's 200° forward rotation based on their experience to regulate the coffee extraction efficiency and ultimately obtain coffee with different flavors.

[0044] According to the Gold Cup standard and industry practice, the household drip coffee maker mentioned in this invention can make coffee with a maximum of 30g of coffee powder (8 cups) at a time, and the filter cup capacity is 650ml (the maximum amount used according to the coffee powder to water ratio of 1:20), so that the coffee will not overflow from the filter cup when the valve is closed throughout the process.

[0045] However, extraction efficiency and the taste of the extracted product are related to factors such as water supply, hot water temperature, coffee grind size, cross-sectional area of ​​the outlet, and pore size of the filter basket. In this embodiment, the parameters of the coffee machine are defined as follows: Hot water supply flow rate (m): 2.32 g / s; Hot water temperature (T): Approximately 92°C; Coffee grind size (D): medium-fine grind, with a particle size between 0.5 and 0.8 mm; Coffee powder usage (g): 30g; Powder bed thickness (H): 41 mm (based on filter basket structure design); Filter basket sidewall filter screen precision (FA): pore size 150μm; Powder to water ratio: 1:20 (total water volume W = 30 g × 20 = 600 g or 600 mL); Theoretical model derivation: 1. Coffee grounds flow model (Darcy's Law) Darcy's law describes the velocity of a fluid flowing through a porous medium:

[0046] in: Volumetric flow rate (m³ / s), equal to Q_in in steady state; The permeability (m²) of a coffee grounds bed depends on the grind size and porosity. : Average cross-sectional area (m²) of the coffee grounds bed; The dynamic viscosity of water (Pa·s) at 92°C is approximately ; : Pressure drop (Pa) through the powder bed; Powder bed thickness (m), L = 41 mm = 0.041 m; pressure drop Driven by gravity and determined by the liquid level in the filter cup: The pressure above the powder bed is approximately equal to atmospheric pressure (P_atm). Powder bed outlet pressure = P_atm + \rho gh (h is the liquid level height in the filter cup); therefore, (The negative sign indicates a decrease in pressure), in terms of magnitude ; Darcy's Law can be simplified to:

[0047] in: Water density, approximately 1000 kg / m³; Gravitational acceleration, 9.8 m / s²; 2. Flow model at the outlet of the filter cup (orifice flow equation) The outlet is a circular orifice, and the flow velocity is derived from Bernoulli's equation:

[0048] in: Emission coefficient, dimensionless (typical value 0.6-0.8, take 0.7); : Cross-sectional area of ​​the liquid outlet (m²); Filter cup liquid level height (m); 3. Solving the steady-state model for A_out At steady state, Q_in = Q_out:

[0049]

[0050] Solve for h from the second equation:

[0051] Substitute into the first equation:

[0052] simplify:

[0053] Squaring both sides:

[0054] Solve for A_out²:

[0055] final:

[0056] Parameter estimation: Coffee bedding parameters: Coffee bed volume V_bed: Coffee powder usage G = 30 g, coffee powder bulk density ρ_bulk ≈ 0.4 g / cm³ (typical industry value); ; Powder bed thickness L: 41 mm = 0.041 m; Average cross-sectional area A_bed: The filter basket is conical, but the average area is used for simplified calculation (assuming a cylindrical approximation). ; Permeability k estimation (Kozeny-Carman equation); Porosity The true density of coffee powder ρ_true ≈ 1.2 g / cm³, and the bulk density ρ_bulk = 0.4 g / cm³. ; Average particle size d_p: ; Kozeny-Carman equations:

[0057] calculate:

[0058]

[0059]

[0060]

[0061]

[0062] Other parameters Q_in: 2.32 g / s = 2.32 mL / s = (Water density ≈ 1000 kg / m³); ρ: 1000 kg / m³; μ: Viscosity of water at 92°C, approximately ; L: 0.041 m; C_d: Emission factor, taken as 0.7 (standard value); g: 9.8 m / s²; Calculate A_out: Substitute into the model equation:

[0063] Calculate the numerator:

[0064]

[0065]

[0066]

[0067] Calculate the denominator:

[0068]

[0069]

[0070]

[0071]

[0072] Calculate A_out²:

[0073] Calculate A_out:

[0074] Convert to commonly used units:

[0075] Model validation: Extraction time and extraction rate: Extraction time: Total water injection time t_water = W / Q_in = 600 / 2.32 ≈ 258.6 seconds > 240 seconds, which meets the requirements; the outlet design does not affect the total time (steady-state flow rate is determined by the input), and the liquid level height h is reasonable (calculated h ≈ 0.02 m, about 2 cm, with no risk of overflow). Extraction rate: Outlet concentration model: Coffee solids concentration C_out = C_sat × (1 - exp(-k× t_res)) when water leaves the coffee bed; C_sat: Saturation concentration, which is the maximum concentration of coffee solids that can be dissolved in water, typically 0.3 g / mL (based on industry data, at 92°C). k: Extraction rate constant ( (), depends on grind size, temperature, and coffee powder properties; t_res: Average residence time (s), which is the average contact time of water in the powder bed, calculated as pore volume divided by flow rate; Step 1: Calculate the average residence time (t_res) Coffee bed volume (V_bed): The bulk density of coffee grounds is approximately 0.4 g / cm³, therefore V_bed = G / ρ_bulk = 30 g / 0.4 g / cm³ = 75 cm³; Porosity ( The true density of coffee powder is approximately 1.2 g / cm³, therefore = 1 - (ρ_bulk / ρ_true) =1 - (0.4 / 1.2) ≈ 0.666; Pore ​​volume (V_pores): × V_bed = 0.666 × 75 cm³ ≈ 50 mL; Flow rate (Q_in): 2.32 mL / s; Mean residence time (t_res): V_pores / Q_in = 50 mL / 2.32 mL / s ≈ 21.55 seconds; Step 2: Estimate the extraction rate constant (k) The k-value is affected by the grinding fineness and temperature. For medium to fine grinding (d_p = 0.65 mm) and a water temperature of 92°C, based on industry experience and data, the k-value is typically between 0.0010 and 0.0015. between; If the grinding degree is coarser (d_p is larger), the k value is lower (approximately 0.0010). ); If the grinding degree is fine (d_p is small), the k value is high (approximately 0.0015). Currently, the calculation takes k ≈ 0.0012. As a reasonable estimate; Step 3: Calculate the outlet concentration (C_out) Using the model: C_out = C_sat × (1 - exp(-k × t_res)) C_sat = 0.3 g / mL k = 0.0012

[0076] t_res = 21.55 seconds Calculate: exp(-k × t_res) = exp(-0.0012 × 21.55) = exp(-0.02586) ≈0.9745; C_out = 0.3 × (1 - 0.9745) = 0.3 × 0.0255 ≈ 0.00765 g / mL; Step 4: Calculate the total extracted solids mass and extraction rate. Total extracted solids mass: C_out × total water volume W = 0.00765 g / mL × 600 mL ≈ 4.59 g; Extraction rate: (mass of extracted solids / mass of coffee powder) × 100% = (4.59 g / 30 g) × 100% ≈ 15.3%; Since the extraction rate is affected by many factors such as coffee bean variety, roasting degree, amount of water added (different coffee-to-water ratios), grind size, and flow rate of the outlet, and consumers may not strictly follow the instructions during use, the current product design parameters are reasonable, leaving some room for different consumers to blend coffee to suit their own taste.

[0077] Calculation of valve stem opening stroke 'h': Based on the above calculations, the ideal value for the outlet cross-sectional area Aout is 45.6 mm². Fluid flow area requirement after valve stem opening: Aflow ≥ Aout; Aflow = π * d * h ≥ Aout; h≥45.6 / (3.14*7.37)=1.97; Therefore, a valve stem opening stroke of 2mm is just right.

[0078] In this embodiment, the valve stem stroke is designed to be 2mm.

[0079] Based on the above and user experience, when making coffee, rotating the pot body 200 to different angles can control the valve stem to rise to different strokes, thereby controlling the extraction effect. Optionally, a scale can be set on the surface of the lid of the pot body 200, so that users can more intuitively observe the angle of rotation of the pot body 200 and better make coffee that suits their taste.

[0080] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0081] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. A coffee machine's concentration adjustment device; the coffee machine includes: The main unit (100) and the vessel body (200) are provided. The main unit (100) is equipped with an extraction component (300). The main unit (100) has a position (101) for placing the vessel body (200) below the extraction component (300). A valve stem (400) is provided at the outlet (301) of the extraction component (300). The valve stem (400) is connected to an elastic element (500). The elastic force of the elastic element (500) causes the valve stem (400) to block the outlet (301). The feature is that: A limiting member (110) is provided around the liquid outlet (301), and the limiting member (110) is provided with an opening (113). The lid (210) of the pot body (200) is provided with a limiting part (220) through which the opening (113) can pass; the limiting part (220) and the opening (113) cooperate to allow the pot body (200) to be placed only in the first angle position (101). The lower end of the valve stem (400) is provided with a head (410), which is located in the space surrounded by the limiting member (110). The head (410) is provided with a guide surface (411), and the opening and closing ends of the guide surface (411) form a height difference. The lid (210) of the pot body (200) is provided with an inlet (201) corresponding to the outlet (301). The limiting part (220) is provided with a protrusion (202) corresponding to the guide surface (411). When the pot body (200) rotates in the position (101), the protrusion (202) moves from the opening end to the closing end of the guide surface (411) to gradually open the outlet (301).

2. The coffee machine concentration adjustment device according to claim 1, characterized in that: The lid (210) has an arc-shaped, upwardly arched limiting part (220) in the middle, and the limiting part (220) has the liquid inlet (201).

3. The coffee machine concentration adjustment device according to claim 2, characterized in that: The limiting member (110) includes: a first limiting member (111) and a second limiting member (112) arranged in an arc shape, and the opening (113) is formed between the openings of the first limiting member (111) and the second limiting member (112); the inner wall surfaces of the first limiting member (111) and the second limiting member (112) are arranged in an arc shape.

4. The coffee machine concentration adjustment device according to claim 3, characterized in that: The inner wall of the first limiting member (111) is provided with a first limiting rod (1111); the inner wall of the second limiting member (112) is provided with a second limiting rod (1112); when the protrusion (202) moves from the beginning to the end of the guide surface (411), the first limiting rod (1111) or the second limiting rod (1112) abuts against the side of the limiting part (220).

5. The coffee machine concentration adjustment device according to claim 4, characterized in that: The lid (210) has a boss (230) in the middle, and the top of the boss (230) has the limiting part (220); the side of the boss (230) is arc-shaped.

6. The coffee machine concentration adjustment device according to claim 5, characterized in that: The lower edge of the boss (230) is connected to the outer edge of the lid (210) by an arc-shaped concave surface (240), and a return port (203) is provided at the connection between the lower edge of the boss (230) and the concave surface (240).

7. The concentration adjustment device for a coffee machine according to claim 1, characterized in that: The upper end of the valve stem (400) is provided with a sealing part (420), which is used to seal the liquid outlet (301).

8. The concentration adjustment device for a coffee machine according to claim 7, characterized in that: A rod (430) is provided between the sealing part (420) and the head (410); the head (410) is provided with a concave part (413), and the concave part (413) is provided with a liquid hole (412), the diameter of the liquid hole (412) is less than or equal to the diameter of the liquid inlet (201).

9. A coffee machine, characterized in that: The concentration regulating device includes any one of claims 1-8.

10. A coffee machine according to claim 8, characterized in that: A heating plate (120) is provided at position (101) of the host (100).

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