Coffee machine pressure regulating device and coffee machine extraction system

Abstract

The utility model relates to the technical field of coffee makers, in particular to a coffee maker pressure regulating device and a coffee maker extraction system.The coffee maker pressure regulating device comprises a driving device, a gear transmission assembly, a pressure regulating valve, a detection assembly and a pressure sensor or a weight sensor, and the pressure regulating valve comprises a pressure regulating piston rod and a pressure regulating piston; the pressure-regulating piston rod is in threaded rotation connection with the pressure-regulating piston; the detection assembly comprises a detection piston rod, a detection piston, a detection spring, a force application component and a mounting seat; the driving device is in transmission connection with the pressure regulating piston rod and the detection piston rod through a gear transmission assembly and drives the two to rotate synchronously, so that the pressure regulating piston and the detection piston move close to or away from each other; the pressure sensor or the weight sensor is used for detecting pressure relief pressure. The pressure regulating device can effectively control the pressure of the pipeline, realizes various different extraction pressures, meets different extraction requirements, can directly display the pressure relief pressure, and is more accurate and more visual.

Description

Technical Field

[0001] The present application relates to the technical field of coffee machines, and in particular to a pressure regulating device for a coffee machine, a coffee extraction system for a coffee machine, and a pressure regulating method for a coffee machine. Background Art

[0002] Currently, the pressure variation of coffee machines on the market usually changes the pressure in the coffee pipeline by varying the frequency of the pump body, which is a relatively effective method. However, due to the very high price of the variable frequency rotary pump, the cost performance is not high. Moreover, because the pump has the function of variable frequency, the water flow changes and is unstable. Therefore, a pressure regulating valve is currently mostly used for pressure regulation. However, the solution of the regulating valve also has certain problems. The regulating valve can only perform one kind of pressure regulation and cannot perform multiple different pressure regulations according to the extraction requirements. Summary of the Utility Model

[0003] The purpose of the present application is to provide a pressure regulating device for a coffee machine, a coffee extraction system for a coffee machine, and a pressure regulating method for a coffee machine, which to a certain extent solve the technical problem in the prior art that the pressure regulating valve of the coffee machine can only perform one kind of pressure regulation and cannot meet the requirements of different extraction pressure.

[0004] The present application provides a pressure regulating device for a coffee machine, including: a driving device, a gear transmission assembly, a pressure regulating valve, a detection assembly, and a pressure sensor or a weight sensor; wherein, the pressure regulating valve includes a pressure regulating piston rod and a pressure regulating piston, and the pressure regulating piston rod is in threaded rotational connection with the pressure regulating piston; the detection assembly includes a detection piston rod, a detection piston, a detection spring, a force applying member, and a mounting seat;

[0005] Wherein, the mounting seat is formed with a mounting cavity and two avoidance through holes communicated with the mounting cavity; the detection piston is movably arranged in the mounting cavity through one of the avoidance through holes; the detection piston rod is in threaded rotational connection with the detection piston; the detection spring is arranged in the mounting cavity, and both ends of the spring are respectively connected with the detection piston and the force applying member;

[0006] The pressure sensor or the weight sensor is arranged on one side of the mounting seat away from the detection piston, and the force applying member can move along with the detection piston, and thus can pass through the other avoidance through hole to apply different pressures to the pressure sensor or the weight sensor; the driving device is respectively in transmission connection with the pressure regulating piston rod and the detection piston rod through the gear transmission assembly, and can respectively drive the pressure regulating piston rod and the detection piston rod to rotate synchronously, so that the pressure regulating piston and the detection piston move towards the direction of approaching or separating from each other.

[0007] In the above technical solution, further, the pressure regulating piston rod, the detection piston rod, and the gear in the gear transmission assembly that is fixedly connected to the pressure regulating piston rod and the detection piston rod are coaxially arranged.

[0008] In any of the above technical solutions, further, the gear transmission assembly includes a first gear and a second gear; wherein, the first gear is connected to the driving end of the driving device, the second gear is fixedly connected to the pressure regulating piston rod and the detection piston rod respectively, and the second gear can drive the pressure regulating piston rod and the detection piston rod to rotate synchronously.

[0009] In any of the above technical solutions, further, a first limiting boss is formed on the outer wall of the detection piston rod, and the first limiting boss abuts against the top or bottom of the gear in the gear transmission assembly that cooperates with the detection piston rod.

[0010] In any of the above technical solutions, further, the detection assembly further includes a first sealing ring, a first groove is formed on the outer wall of the detection piston, and the first sealing ring is installed in the first groove.

[0011] In any of the above technical solutions, further, the pressure regulating valve includes the pressure regulating piston rod, the pressure regulating piston, a pressure regulating spring, a sealing member, and a valve seat; wherein, the valve seat forms a cavity with an open end, and a water inlet and a pressure relief port that are respectively communicated with the cavity;

[0012] The pressure regulating piston is movably arranged in the cavity; the pressure regulating piston rod is in threaded rotation connection with the pressure regulating piston; the pressure regulating spring and the sealing member are both arranged in the installation cavity, and two ends of the pressure regulating spring are respectively connected to the pressure regulating piston and the sealing member; the sealing member is arranged corresponding to the water inlet and can block the water inlet.

[0013] In any of the above technical solutions, further, a second limiting boss is formed on the outer wall of the pressure regulating piston rod, and the second limiting boss abuts against the top or bottom of the gear in the gear transmission assembly that cooperates with the pressure regulating piston rod.

[0014] In any of the above technical solutions, further, the pressure regulating valve further includes a second sealing ring, a second groove is formed on the outer wall of the pressure regulating piston, and the second sealing ring is installed in the second groove.

[0015] The present application also provides a coffee machine extraction system, including the coffee machine pressure regulating device according to any of the above technical solutions. Therefore, it has all the beneficial technical effects of the coffee machine pressure regulating device, and will not be elaborated here.

[0016] In the above technical solution, further, the coffee machine extraction system further includes a water tank, a pump, a boiler, a valve, and an extraction head; wherein, the water tank, the pump, the boiler, the valve, and the extraction head are sequentially connected and communicated; the pipeline connecting the pump and the boiler is connected to the water inlet of the regulating valve of the coffee machine pressure regulating device.

[0017] In any of the above technical solutions, further, the coffee machine extraction system further includes a pressure sensor, and the pressure sensor is disposed on the pipeline connecting the extraction head and the valve in communication.

[0018] In any of the above technical solutions, further, the valve is a solenoid valve.

[0019] The present application also provides a coffee machine automatic pressure regulating method for the coffee machine pressure regulating device or the coffee machine extraction system described in any of the above technical solutions. Therefore, it has all the beneficial technical effects of the coffee machine pressure regulating device or the coffee machine extraction system, and will not be elaborated herein.

[0020] In the above technical solution, further, the coffee machine pressure regulating method includes the following steps:

[0021] When the extraction is started and a variable pressure instruction from the user is obtained, the coffee machine performs an active pressure change operation, starts the driving device, and the driving device drives the pressure regulating piston rod to rotate synchronously through the gear transmission assembly, and then drives the pressure regulating piston to move along a preset direction for pressure regulation. At the same time, the driving device synchronously drives the detection piston rod to rotate through the gear transmission assembly, and then drives the detection piston together with the detection spring and the force applying member to move along the opposite direction of the preset direction until the value detected by the pressure sensor or the weight sensor reaches a preset value, and the driving device stops working. And when the next pressure change instruction appears, the driving device is restarted, and the above steps are repeated for pressure adjustment.

[0022] In any of the above technical solutions, further, the pressure regulating spring and the detection spring have the same structural composition, and when the weight sensor is installed on the side of the mounting seat away from the detection piston, the value detected by the weight sensor is the pressure relief pressure of the pressure regulating valve. When the pressure sensor is installed on the side of the mounting seat away from the detection piston, after the pressure value detected by the pressure sensor is converted into a weight value, it is the pressure relief pressure of the pressure regulating valve; wherein the pressure relief pressure is equal to the extraction pressure; or

[0023] The pressure regulating spring and the detection spring have different structural compositions. According to the formula F = f×G×d 4 / (8×n×D 3) = (a ± b) × G × d 4 / (8 × n × D 3 ), obtain the spring force of the detection spring and the spring force of the pressure regulating spring at different compression values of the spring, and make a table. Then, based on the table and the detection value of the pressure sensor or the weight sensor, obtain the pressure relief pressure, and the pressure relief pressure is equal to the extraction pressure;

[0024] Wherein, a is the pre-compression amount of the spring; b is the compression value of the spring; G is the die-cutting modulus of the material; d is the diameter of the spring wire; n is the effective number of turns of the spring; D is the mean diameter of the spring.

[0025] The present application also provides an automatic pressure regulating method for a coffee machine, which is used for the coffee machine extraction system described in the above technical solution. Therefore, it has all the beneficial technical effects of the coffee machine extraction system, and will not be elaborated here.

[0026] In the above technical solution, further, the coffee machine pressure regulating method includes the following steps:

[0027] When the extraction is started and a variable pressure instruction from the user is obtained, the coffee machine performs an active variable pressure operation, starts the driving device, and the driving device drives the pressure regulating piston rod to rotate synchronously through the gear transmission assembly, and then drives the pressure regulating piston to move along a preset direction for pressure regulating operation. At the same time, the driving device synchronously drives the detection piston rod to rotate through the gear transmission assembly, and then drives the detection piston together with the detection spring and the force applying member to move along the opposite direction of the preset direction until the value detected by the pressure sensor or the weight sensor reaches a preset value, and the driving device stops working. And when the next variable pressure instruction appears, restart the driving device and repeat the above steps for pressure adjustment;

[0028] When the extraction is started and a variable pressure instruction from the user is not obtained, the coffee machine performs a passive variable pressure operation. According to the extraction pressure detected by the pressure sensor, the driving device is started, and the driving device drives the pressure regulating piston rod to rotate synchronously through the gear transmission assembly, and then drives the pressure regulating piston to move along a preset direction for pressure regulating operation until the value detected by the pressure sensor reaches a preset value, and the driving device stops working, and the extraction operation continues until completion.

[0029] In any of the above technical solutions, further, the pressure regulating spring and the detection spring have the same structural composition. When the weight sensor is installed on the side of the mounting seat away from the detection piston, the value detected by the weight sensor is the pressure relief pressure of the pressure regulating valve. When the pressure sensor is installed on the side of the mounting seat away from the detection piston, after converting the pressure value detected by the pressure sensor into a weight value, it is the pressure relief pressure of the pressure regulating valve; wherein the pressure relief pressure is equal to the extraction pressure; or

[0030] the pressure regulating spring and the detection spring have different structural compositions. According to the formula F = f×G×d 4 / (8×n×D 3 )=(a±b)×G×d 4 / (8×n×D 3 ), the spring force of the detection spring and the value of the pressure regulating spring under different compression amounts are obtained, and a table is made. Then, according to the table and the detection value of the pressure sensor or the weight sensor, the pressure relief pressure is obtained, and the pressure relief pressure is equal to the extraction pressure;

[0031] wherein, a is the pre-compression amount of the spring; b is the compression value of the spring; G is the die-cutting modulus of the material; d is the diameter of the spring wire; n is the effective number of turns of the spring; D is the mean diameter of the spring.

[0032] Compared with the prior art, the beneficial effects of the present application are as follows:

[0033] The coffee machine pressure regulating device provided by the present application can effectively control the pipeline pressure, realize the adjustment of a variety of different extraction pressures, meet different extraction requirements, that is, provide a new variable pressure method, improve the user experience, be able to extract coffee with different tastes, and the coffee machine pressure regulating device of the present application can directly display the pressure relief pressure, which is more accurate and more intuitive. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic structural diagram of the coffee machine pressure regulating device provided by the embodiment of the present application;

[0036] Figure 2 It is a partial structural schematic diagram of the coffee machine pressure regulating device provided by the embodiment of the present application;

[0037] Figure 3 Another structural schematic diagram of the coffee machine pressure regulating device provided by the embodiment of the present application;

[0038] Figure 4 is Figure 3 A cross-sectional view along the A-A section;

[0039] Figure 5 A structural schematic diagram of the coffee machine extraction system provided by the embodiment of the present application;

[0040] Figure 6 Another structural schematic diagram of the coffee machine extraction system provided by the embodiment of the present application.

[0041] Reference numerals:

[0042] 1 - driving device, 2 - gear transmission assembly, 21 - first gear, 22 - second gear, 3 - pressure regulating valve, 31 - pressure regulating piston rod, 311 - second limiting boss, 32 - pressure regulating piston, 33 - pressure regulating spring, 34 - sealing member, 341 - mounting bracket, 342 - sealing silica gel block, 35 - valve seat, 351 - water inlet, 352 - pressure relief port, 36 - second sealing ring, 37 - outer cover, 371 - box body, 372 - cover plate, 4 - detection assembly, 41 - detection piston rod, 411 - first limiting boss, 42 - detection piston, 43 - detection spring, 44 - force applying member, 45 - mounting seat, 46 - first sealing ring, 5 - weight sensor, 100 - water tank, 200 - pump, 300 - coffee machine pressure regulating device, 400 - boiler, 500 - valve, 600 - pressure sensor, 700 - extraction head, 800 - controller, 801 - operation panel. Detailed implementation manners

[0043] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present application.

[0044] Generally, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application.

[0045] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0046] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0047] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0048] The following refers to Figures 1 to 6 Describe a coffee machine pressure regulating device, a coffee machine extraction system, and a coffee machine pressure regulating method according to some embodiments of the present application.

[0049] Embodiment 1

[0050] Refer to Figures 1 to 4 As shown, an embodiment of the present application provides a coffee machine pressure regulating device 300, including: a driving device 1, a gear transmission assembly 2, a pressure regulating valve 3, a detection assembly 4, and a weight sensor 5; wherein, the pressure regulating valve 3 includes a pressure regulating piston rod 31 and a pressure regulating piston 32, and the pressure regulating piston rod 31 is in threaded rotation connection with the pressure regulating piston 32; the detection assembly 4 includes a detection piston rod 41, a detection piston 42, a detection spring 43, a force applying member 44, and a mounting seat 45;

[0051] Wherein, the mounting seat 45 is formed with a mounting cavity and two avoidance through holes communicating with the mounting cavity. Preferably, along the length direction of the mounting seat 45, that is, along the length direction of the mounting cavity, the two avoidance through holes are respectively arranged at both ends of the mounting seat 45, that is, at both ends of the mounting cavity; the detection piston 42 is movably arranged in the mounting cavity through one of the avoidance through holes. Preferably, the moving direction of the detection piston 42 is the same as the length direction of the detection piston rod 41 and the length direction of the mounting cavity;

[0052] The detection piston rod 41 is in threaded rotation connection with the detection piston 42; the detection spring 43 is arranged in the mounting cavity, and both ends of the spring are respectively connected to the detection piston 42 and the force applying member 44;

[0053] The gravitational force sensor 5 is disposed on the side of the mounting base 45 away from the detection piston 42, and the force-applying member 44 can move following the detection piston 42, and thus can apply different pressures to the weight sensor 5 through another avoidance through-hole; the driving device 1 is respectively in transmission connection with the pressure-regulating piston rod 31 and the detection piston rod 41 through the gear transmission assembly 2, and can respectively drive the pressure-regulating piston rod 31 and the detection piston rod 41 to rotate synchronously, so that the pressure-regulating piston 32 and the detection piston 42 move towards the approaching or separating directions.

[0054] According to the structure described above, the pressure-regulating process of the coffee machine pressure-regulating device 300 is as follows:

[0055] When the extraction is started and a variable-pressure instruction from the user is obtained, the coffee machine performs an active variable-pressure operation, starts the driving device 1, the driving device 1 drives the pressure-regulating piston rod 31 to rotate synchronously through the gear transmission assembly 2, and then drives the pressure-regulating piston 32 to move along a preset direction for pressure-regulating operation. At the same time, the driving device 1 synchronously drives the detection piston rod 41 to rotate through the gear transmission assembly 2, and then drives the detection piston 42 together with the detection spring 43 and the force-applying member 44 to move along the opposite direction of the preset direction until the value of the weight sensor 5, that is, the value detected by the weight sensor 5, reaches a preset value, and the driving device 1 stops working. And when the next variable-pressure instruction appears, the driving device 1 is restarted, and the above steps are repeated for pressure adjustment.

[0056] It can be seen that the coffee machine pressure-regulating device 300 provided by the present application can effectively control the pipeline pressure, realize the adjustment of a variety of different extraction pressures, meet different extraction requirements, that is, provide a new variable-pressure method, improve the user experience, and can extract coffee with different tastes. Moreover, the coffee machine pressure-regulating device 300 can directly display the pressure relief pressure, which is more accurate and more intuitive.

[0057] It should be noted that: when the pressure-regulating spring 33 and the detection spring 43 have the same structural composition, that is to say, the pressure-regulating spring 33 and the detection spring 43 are completely identical springs, that is, their materials, the die-cut modulus of the materials, the diameter of the spring wire, the effective number of turns of the spring, the middle diameter of the spring, etc. are all the same. In this case, the value detected by the weight sensor 5 is equal to the pressure relief pressure of the pressure-regulating valve 3, that is to say, the value detected by the weight sensor 5 is the pressure relief pressure, and the pressure relief pressure is equal to the extraction pressure; wherein, the extraction pressure set by the user is the aforementioned preset value;

[0058] When the pressure-regulating spring 33 and the detection spring 43 have different structural compositions, that is to say, at least one of their materials, the die-cut modulus of the materials, the diameter of the spring wire, the effective number of turns of the spring, the middle diameter of the spring, etc. is different. In this case, according to the formula F = f × G × d 4 / (8 × n × D 3 ) = (a ± b) × G × d 4 / (8 × n × D 3 ), the spring force of the detection spring and the spring force of the pressure regulating spring are obtained under different compression values of the springs, and a table is made. Specifically, the compression values of the springs of the detection spring 43 and the pressure regulating spring 33, that is, b, are always the same. For the compression value of the same spring, that is, b, the spring force of the detection spring 43 and the spring force of the pressure regulating spring 33 can be calculated according to the above formula. Furthermore, through multiple tests, multiple groups of the spring force of the detection spring 43 and the spring force of the pressure regulating spring 33 can be obtained and made into a table, thereby obtaining the corresponding relationship between the spring force of the detection spring 43 and the spring force of the pressure regulating spring 33. Then, according to the table and the detection value of the weight sensor 5, the pressure relief pressure is obtained, and the pressure relief pressure is equal to the extraction pressure.

[0059] Wherein, a is the pre-compression amount of the spring, mm; b is the compression value of the spring, mm; G is the die-cutting modulus of the material, MPa; d is the diameter of the spring wire, mm; n is the effective number of turns of the spring; D is the mean diameter of the spring, mm.

[0060] It should be noted that: the weight sensor 5 can also be replaced with a pressure sensor. That is to say, a pressure sensor can be installed on the side of the mounting seat 45 away from the detection piston 42, and the pressure value detected by the pressure sensor is converted into a weight value (that is, the pressure value detected by the pressure sensor / (9.8 N / kg)), which is the pressure relief pressure of the pressure regulating valve 3, and the pressure relief pressure is equal to the extraction pressure.

[0061] In this embodiment, preferably, as Figures 1 to 3 shown, the pressure regulating piston rod 31, the detection piston rod 41, and the gear in the gear transmission assembly 2 that is fixedly connected to the pressure regulating piston rod 31 and the detection piston rod 41, for example, the second gear 22 described below, are coaxially arranged.

[0062] According to the structure described above, the foregoing three are coaxially arranged, ensuring the consistency and synchronism of the rotational movement, which helps to improve the detection accuracy. Of course, they can also be non-coaxially arranged, specifically designed according to actual needs.

[0063] In this embodiment, preferably, as Figure 2 and Figure 4 shown, the gear transmission assembly 2 includes a first gear 21 and a second gear 22; wherein, the first gear 21 is connected to the driving end of the driving device 1, the second gear 22 is fixedly connected to the pressure regulating piston rod 31 and the detection piston rod 41 respectively, and the second gear 22 can drive the pressure regulating piston rod 31 and the detection piston rod 41 to rotate synchronously.

[0064] According to the structure described above, it can be known that under the driving action of two gears, the pressure regulating valve 3 and the detection assembly 4 can be arranged on the same side of the driving device 1, and the two are arranged opposite to each other, so that the driving device 1 can synchronously drive the pressure regulating piston rod 31 and the detection piston rod 41 to move synchronously, and it is not easy to interfere with each other.

[0065] Further, preferably, a central shaft hole is provided in the center of the second gear 22. The pressure regulating piston rod 31 is inserted and fixed at one end of the central shaft hole, and the detection piston rod 41 is inserted and fixed at the other end of the central shaft hole. In order to ensure the stability of the connection, the pressure regulating piston rod 31 and the hole wall of the central shaft hole can be set with a first limiting groove, and the other of the two can be set with a first convex limiting part. The first convex limit cooperates with the first limiting groove to play a role in strengthening the connection and preventing relative rotation. Similarly, one of the detection piston rod 41 and the hole wall of the central shaft hole is set with a second limiting groove, and the other of the two is set with a second convex limiting part. The second convex limit cooperates with the second limiting groove to play a role in strengthening the connection and preventing relative rotation. Of course, it is not limited to this. The pressure regulating piston rod 31 and the detection piston rod 41 can also be in interference fit with the central shaft hole respectively, so that the two are connected more firmly and stably.

[0066] It should be noted that: the number of gears included in the gear transmission assembly 2 is not limited to two, and can be more than two, such as three or four, etc., which is specifically designed according to actual needs.

[0067] Further, preferably, as Figure 1 shown, the coffee machine pressure regulating device 300 further includes an outer cover 37, and the gear assembly, a part of the structure of the pressure regulating piston rod 31, a part of the structure of the pressure regulating piston 32, a part of the structure of the detection piston rod 41, and a part of the structure of the detection piston 42 are all arranged inside the outer cover 37, which plays a role in protecting the gear transmission assembly 2, the piston rod and the piston. And preferably, through holes are provided on both sides of the outer cover 37 to play a role in avoiding the pistons and piston rods on both sides.

[0068] Further, preferably, as Figure 1 shown, the outer cover 37 includes a box body 371 and a cover plate 372, and the two are detachably connected, which is convenient for later maintenance. And preferably, through holes are provided on both the box body 371 and the cover plate 372.

[0069] In this embodiment, preferably, as Figure 4As shown, a first limiting boss 411 is formed on the outer wall of the detection piston rod 41, and the first limiting boss 411 abuts against the bottom of the gear in the gear transmission assembly 2 that matches the detection piston rod 41, that is, the first limiting boss 411 abuts against the bottom of the aforementioned second gear 22. Of course, it is not limited to this. When the detection piston rod 41 is set on one side of the top of the second gear 22, the first limiting boss 411 abuts against the top of the second gear 22. The specific design is based on actual needs.

[0070] According to the structure described above, the first limit protrusion plays the role of installation limit, so that the detection piston rod 41 is fixed relative to the second transmission gear, that is, the detection piston rod 41 is prevented from moving relative to the second transmission gear, thereby ensuring the assembly accuracy of the two and finally achieving synchronous rotation.

[0071] Further, preferably, the first limiting protrusion may be annular, of course, not limited to this, the first limiting protrusion may also be a block, and there are multiple limiting protrusions, and multiple limiting protrusions are evenly spaced along the outer circumference of the detection piston rod 41. Of course, not limited to this, it is designed according to actual needs.

[0072] In this embodiment, preferably, Figure 4 As shown, the detection assembly 4 further includes a first sealing ring 46 , and a first groove is formed on the outer wall of the detection piston 42 , and the first sealing ring 46 is installed in the first groove.

[0073] According to the structure described above, as the detection piston rod 41 moves, when the first sealing ring 46 abuts against the inner wall of the installation cavity, it plays a sealing role to prevent water leakage, and plays the role of detecting the spring 43, the force member 44 and the weight sensor 5, and the structure is more reliable.

[0074] Further, preferably, there are multiple first sealing rings 46 , and the multiple first sealing rings 46 are sequentially spaced along the moving direction of the detection piston 42 , that is, the length direction.

[0075] In this embodiment, preferably, Figure 4 As shown, the force-applying member 44 is a convex block, and the top of the convex portion is inserted into one end of the spring, and the end of the convex block away from the spring has a flat pressure-applying surface, which can act on the detection surface of the weight sensor 5. Of course, the structure of the force-applying member 44 is not limited to this, and can be designed according to actual needs.

[0076] In this embodiment, preferably, Figure 4 As shown, the pressure regulating valve 3 includes a pressure regulating piston rod 31, a pressure regulating piston 32, a pressure regulating spring 33, a sealing member 34 and a valve seat 35; wherein the valve seat 35 is formed with a cavity with an end opening and a water inlet 351 and a pressure relief port 352 respectively connected to the cavity;

[0077] The pressure regulating piston 32 is movably arranged in the cavity; the pressure regulating piston rod 31 is in threaded rotation connection with the pressure regulating piston 32; the pressure regulating spring 33 and the sealing member 34 are both arranged in the installation cavity, and both ends of the pressure regulating spring 33 are respectively connected with the pressure regulating piston 32 and the sealing member 34; the sealing member 34 is arranged corresponding to the water inlet 351 and can block the water inlet 351.

[0078] According to the structure described above, when the pressure regulating piston rod 31 rotates, it will drive the pressure regulating piston 32 to move up and down, thereby adjusting the compression amount of the pressure regulating spring 33, and further adjusting the gap between the sealing member 34 and the water inlet 351, that is, the tightness of the fit, so as to adjust the flow rate and further adjust the pressure.

[0079] Further, preferably, the water inlet 351 can be arranged at the bottom of the valve seat 35, and the pressure relief port 352 is arranged at the side of the valve seat 35. Of course, it is not limited to this, and it can also be designed according to actual needs. For example, the water inlet 351 can be arranged at the top of the valve seat 35, and the pressure relief port 352 is arranged at the side of the valve seat 35, etc., or the positions of the water inlet 351 and the pressure relief port 352 can be interchanged, which is specifically designed according to actual needs.

[0080] In this embodiment, preferably, as Figure 4 shown, a second limiting boss 311 is formed on the outer wall of the pressure regulating piston rod 31, and the second limiting boss 311 abuts against the top or bottom of the gear in the gear transmission assembly 2 that cooperates with the pressure regulating piston rod 31.

[0081] According to the structure described above, the second limiting protrusion plays a role of installation limitation, so that the pressure regulating piston rod 31 is fixed relative to the second transmission gear, that is, to prevent the sleeve piston rod from moving relative to the second transmission gear, thereby ensuring the assembly accuracy of the two and finally realizing synchronous rotation.

[0082] Further, preferably, the second limiting protrusion can be annular. Of course, it is not limited to this. The second limiting protrusion can also be a block, and the number of them is multiple. The multiple limiting protrusions are evenly spaced along the outer circumference of the pressure regulating piston rod 31. Of course, it is not limited to this, and it is specifically designed according to actual needs.

[0083] In this embodiment, preferably, as Figure 4 shown, the pressure regulating valve 3 further includes a second sealing ring 36. A second groove is formed on the outer wall of the pressure regulating piston 32, and the second sealing ring 36 is installed in the second groove.

[0084] According to the structure described above, as the pressure regulating piston rod 31 moves, when the second sealing ring 36 abuts against the inner wall of the cavity, it plays a sealing role to avoid water leakage, which is safer and more reliable, and plays a role in protecting the drive device 1, gears, detection assembly 4 and weight sensor 5, and the structure is more reliable.

[0085] Further, preferably, there are multiple second sealing rings 36 , and the multiple second sealing rings 36 are sequentially spaced along the moving direction of the pressure regulating piston 32 , that is, the length direction.

[0086] In this embodiment, preferably, Figure 4 As shown, the sealing member 34 includes a mounting bracket 341 and a sealing silicone block 342, wherein the mounting bracket 341 is a convex block, and the top of the convex block is inserted into one end of the pressure regulating spring 33, and the end of the convex block away from the pressure regulating spring 33 is provided with a groove, and the sealing silicone block 342 is filled and fixed in the groove. Of course, the structure of the sealing member 34 is not limited to this, and it can also be a whole block, etc., which is specifically designed according to actual needs.

[0087] In this embodiment, preferably, the driving device 1 is a motor, which can rotate forward and reverse, thereby driving the piston rod to move in two opposite directions, thereby adjusting the spring pressure of the pressure regulating valve 3 .

[0088] Embodiment 2

[0089] See also Figure 5 As shown, the second embodiment of the present application also provides a coffee machine extraction system, including the coffee machine pressure regulating device 300 described in the above-mentioned first embodiment, and thus, has all the beneficial technical effects of the coffee machine pressure regulating device 300, and the same technical features and beneficial effects are not repeated.

[0090] In this embodiment, preferably, Figure 5 As shown, the coffee machine extraction system also includes a water tank 100, a pump 200, a boiler 400, a valve 500 and an extraction head 700; wherein the water tank 100, the pump 200, the boiler 400, the valve 500 and the extraction head 700 are sequentially connected; the pipeline connecting the pump 200 and the boiler 400 is connected to the water inlet 351 of the regulating valve of the coffee machine pressure regulating device 300.

[0091] According to the structure described above, the coffee machine extraction system uses the coffee machine pressure regulating device 300 to adjust the pipeline pressure in the extraction system, thereby achieving a variety of different extraction pressures to meet different extraction needs, that is, it provides a new pressure change method, which can extract coffee with different tastes and improve the user experience. Moreover, the coffee machine pressure regulating device 300 can directly display the pressure relief pressure, which is more accurate and intuitive.

[0092] It should be noted that: the weight sensor 5 can also be replaced with a pressure sensor. The pressure value detected by the pressure sensor is converted into a weight value (that is, the pressure value detected by the pressure sensor / (9.8 N / kg)), which is the pressure relief pressure of the pressure regulating valve 3, and the pressure relief pressure is equal to the extraction pressure.

[0093] Embodiment III

[0094] Embodiment III of the present application further provides an automatic pressure regulation method for a coffee machine, which is used for the coffee machine pressure regulation device 300 described in Embodiment I above or the coffee machine extraction system described in Embodiment II above. Therefore, it has all the beneficial technical effects of the coffee machine pressure regulation device 300 or the coffee machine extraction system, and the same technical features and beneficial effects will not be repeated.

[0095] In this embodiment, preferably, as Figures 1 to 5 shown, the automatic pressure regulation method for a coffee machine includes the following steps:

[0096] When the extraction is started and a variable pressure instruction from the user is obtained, the coffee machine performs an active pressure change operation, starts the driving device 1, and the driving device 1 drives the pressure regulating piston rod 31 to rotate synchronously through the gear transmission assembly 2, and then drives the pressure regulating piston 32 to move along a preset direction for pressure regulation. At the same time, the driving device 1 drives the detection piston rod 41 to rotate synchronously through the gear transmission assembly 2, and then drives the detection piston 42 together with the detection spring 43 and the force applying member 44 to move along the opposite direction of the preset direction until the value of the weight sensor 5, that is, the value detected by the weight sensor 5, reaches a preset value, and the driving device 1 stops working. And when the next pressure change instruction appears, the driving device 1 is restarted, and the above steps are repeated for pressure adjustment.

[0097] According to the above description, it can be seen that this method is an active pressure change method. That is to say, initially, the user sets the pressure value according to their own needs, and then, according to the set pressure value, the coffee machine pressure regulation device 300 is used for pressure regulation, and finally the extraction pressure required by the customer is achieved. It can be seen that the pipeline pressure can be effectively controlled according to the above method steps, the adjustment of various different extraction pressures can be realized, different extraction requirements can be met, that is, a new pressure change method is provided, the user experience is improved, coffee with different tastes can be extracted, and the coffee machine pressure regulation device 300 can directly display the pressure relief pressure, which is more accurate and intuitive.

[0098] In this embodiment, preferably, the pressure regulating spring 33 and the detection spring 43 have the same structural composition. That is to say, the pressure regulating spring 33 and the detection spring 43 are exactly the same springs. Namely, their materials, the die-cutting modulus of the materials, the diameter of the spring wire, the effective number of turns of the spring, the mean diameter of the spring, etc. are all the same. In this case, the value detected by the weight sensor 5 is equal to the pressure relief pressure of the pressure regulating valve 3. That is to say, the value detected by the weight sensor 5 is the pressure relief pressure, and the pressure relief pressure is equal to the extraction pressure; among them, the extraction pressure set by the user is the aforementioned preset value;

[0099] Or the structural compositions of the pressure regulating spring 33 and the detection spring 43 are different. And when the structural compositions of the pressure spring and the detection spring 43 are different, that is to say, at least one of their materials, the die-cutting modulus of the materials, the diameter of the spring wire, the effective number of turns of the spring, the mean diameter of the spring, etc. is different. In this case, according to the formula F = f×G×d 4 / (8×n×D 3 )=(a±b)×G×d 4 / (8×n×D 3 ), obtain the spring force of the detection spring and the spring force of the pressure regulating spring 33 under different compression values of the springs, and make a table. Specifically, the compression values of the springs of the detection spring 43 and the pressure regulating spring 33, that is, b, are always the same. For the same compression value of the spring, that is, b, the spring force of the detection spring 43 and the spring force of the pressure regulating spring 33 can be calculated according to the above formula. Furthermore, through multiple tests, multiple groups of the spring force of the detection spring 43 and the spring force of the pressure regulating spring 33 can be obtained and made into a table, so as to obtain the corresponding relationship between the spring force of the detection spring 43 and the spring force of the pressure regulating spring 33. Then, according to the table and the detection value of the weight sensor 5, the pressure relief pressure is obtained, and the pressure relief pressure is equal to the extraction pressure.

[0100] Among them, a is the pre-compression amount of the spring, mm; b is the compression value of the spring, mm; G is the die-cutting modulus of the material, MPa; d is the diameter of the spring wire, mm; n is the effective number of turns of the spring; D is the mean diameter of the spring, mm.

[0101] It should be noted that: the pump 200, the boiler 400, the valve 500 such as the solenoid valve, the encoder, the driving device 1, etc. are respectively communicatively connected to the controller 800, and cooperate with the above method to achieve automatic control. And this controller 800 can be designed separately or integrated with the total controller 800 of the coffee machine, and is specifically designed according to actual needs. In addition, the controller 800 is provided with an operation panel 801.

[0102] Further, preferably, for the step of the user issuing a pressure change instruction, specifically, the user first sets the extraction pressure, and then the controller 800 controls the driving device 1 to start working, and finally the pressure value detected by the weight sensor 5 reaches the preset value, thereby completing the active pressure regulation.

[0103] It should be noted that: the above method is also applicable to the scheme of replacing the weight sensor 5 with a pressure sensor. The pressure value detected by the pressure sensor is converted into a weight value (that is, the pressure value detected by the pressure sensor / (9.8 N / kg)), which is the pressure relief pressure of the pressure regulating valve 3, and the pressure relief pressure is equal to the extraction pressure.

[0104] Embodiment 4

[0105] See Figure 6 As shown, Embodiment 2 of the present application also provides a coffee machine extraction system, including the coffee machine pressure regulating device 300 described in Embodiment 1 above. Therefore, it has all the beneficial technical effects of the coffee machine pressure regulating device 300, and the same technical features and beneficial effects will not be repeated.

[0106] In this embodiment, preferably, as Figure 6 shown, the coffee machine extraction system further includes a water tank 100, a pump 200, a boiler 400, a valve 500, and an extraction head 700; wherein, the water tank 100, the pump 200, the boiler 400, the valve 500, and the extraction head 700 are connected in sequence; the pipeline connecting the pump 200 and the boiler 400 is connected to the water inlet 351 of the regulating valve of the coffee machine pressure regulating device 300.

[0107] Further, preferably, the coffee machine extraction system further includes a pressure sensor 600, and the pressure sensor 600 is arranged on the pipeline connecting the extraction head 700 and the valve 500.

[0108] According to the structure described above, the coffee machine extraction system has active pressure change and passive pressure change operations during coffee extraction:

[0109] When the extraction is started and a pressure change instruction from the user is obtained, the coffee machine performs an active pressure change operation, starts the driving device 1, and the driving device 1 drives the pressure regulating piston rod 31 to rotate synchronously through the gear transmission assembly 2, and then drives the pressure regulating piston 32 to move along the preset direction for pressure regulation. At the same time, the driving device 1 synchronously drives the detection piston rod 41 to rotate through the gear transmission assembly 2, and then drives the detection piston 42 together with the detection spring 43 and the force applying member 44 to move in the opposite direction of the preset direction until the value of the weight sensor 5, that is, the value detected by the weight sensor 5, reaches the preset value, and the driving device 1 stops working. And when the next pressure change instruction appears, the driving device 1 is restarted, and the above steps are repeated for pressure adjustment;

[0110] When the extraction is started and no pressure change instruction from the user is obtained, the coffee machine performs a passive pressure change operation. According to the extraction pressure detected by the pressure sensor 600, the driving device 1 is started. The driving device 1 drives the pressure regulating piston rod 31 to rotate synchronously through the gear transmission assembly 2, and then drives the pressure regulating piston 32 to move along a preset direction for pressure regulation operation until the value of the pressure sensor 600, that is, the value detected by the pressure sensor 600, reaches the preset value, and the driving device 1 stops working. The extraction operation continues until it is completed.

[0111] As can be seen from the above, the functions of this system are relatively complete. It can not only perform an active pressure change operation according to the user's needs to make coffee with a specific taste that meets the user's requirements, but also perform a passive pressure change operation. That is, when no pressure regulation instruction is received and a certain deviation exists between the actual extraction pressure and the ideal extraction pressure, the pressure can be automatically regulated to make the extracted taste reach the best.

[0112] It should be noted that: The weight sensor 5 can also be replaced with a pressure sensor. However, after converting the pressure value detected by the pressure sensor into a weight value (that is, the pressure value detected by the pressure sensor / (9.8 N / kg)), it is the pressure relief pressure of the pressure regulating valve 3, and the pressure relief pressure is equal to the extraction pressure.

[0113] Embodiment Five

[0114] Embodiment Five of the present application also provides a method for automatically regulating the pressure of a coffee machine for the coffee machine extraction system described in Embodiment Four above. Therefore, it has all the beneficial technical effects of the coffee machine extraction system, and the same technical features and beneficial effects will not be repeated.

[0115] In this embodiment, preferably, as Figures 1 to 4 、 Figure 6 shown, the method for automatically regulating the pressure of the coffee machine includes the following steps:

[0116] When the extraction is started and a pressure change instruction from the user is obtained, the coffee machine performs an active pressure change operation. The driving device 1 is started. The driving device 1 drives the pressure regulating piston rod 31 to rotate synchronously through the gear transmission assembly 2, and then drives the pressure regulating piston 32 to move along a preset direction for pressure regulation operation. At the same time, the driving device 1 synchronously drives the detection piston rod 41 to rotate through the gear transmission assembly 2, and then drives the detection piston 42 together with the detection spring 43 and the force applying member 44 to move along the opposite direction of the preset direction until the value of the weight sensor 5, that is, the value detected by the weight force sensor 5, reaches the preset value, and the driving device 1 stops working. And when the next pressure change instruction appears, the driving device 1 is restarted, and the above steps are repeated for pressure adjustment;

[0117] When the extraction is started and no voltage transformation instruction from the user is obtained, the coffee machine performs a passive voltage transformation operation. According to the extraction pressure detected by the pressure sensor 600, the driving device 1 is started. The driving device 1 drives the voltage regulating piston rod 31 to rotate synchronously through the gear transmission assembly 2, and then drives the voltage regulating piston 32 to move along a preset direction for voltage regulation operation until the value of the pressure sensor 600, that is, the value detected by the pressure sensor 600, reaches the preset value, and the driving device 1 stops working. The extraction operation continues until it is completed.

[0118] According to the above description, in order to cooperate with the voltage transformation operation of the coffee extraction system, two voltage transformation methods are provided, an active voltage transformation method and a passive voltage transformation method. For the active voltage transformation method, it means to perform an active voltage transformation operation according to the user's needs to make coffee with a specific taste that meets the user's needs. For the passive voltage transformation method, it means that when no voltage regulation instruction is received and a certain deviation exists between the actually detected extraction pressure and the ideal extraction pressure, voltage regulation processing can be automatically performed to make the extracted taste reach the best.

[0119] In this embodiment, preferably, the voltage regulating spring 33 and the detection spring 43 have the same structural composition. That is to say, the voltage regulating spring 33 and the detection spring 43 are completely identical springs, that is, their materials, the die-cut modulus of the materials, the diameter of the spring wire, the effective number of turns of the spring, the mean diameter of the spring, etc. are all the same. In this case, the value detected by the weight sensor 5 is equal to the pressure relief pressure of the pressure regulating valve 3. That is to say, the value detected by the weight sensor 5 is the pressure relief pressure, and the pressure relief pressure is equal to the extraction pressure; wherein, the extraction pressure set by the user is the aforementioned preset value;

[0120] Or the voltage regulating spring 33 and the detection spring 43 have different structural compositions. And when the voltage regulating spring and the detection spring 43 have different structural compositions, that is to say, at least one of their materials, the die-cut modulus of the materials, the diameter of the spring wire, the effective number of turns of the spring, the mean diameter of the spring, etc. is different. In this case, according to the formula F = f×G×d 4 / (8×n×D 3 ) = (a±b)×G×d 4 / (8×n×D 3) Obtain the spring force of the detection spring and the spring force of the pressure regulating spring 33 under different compression values of different springs, and create a table. Specifically, the compression values of the springs of the detection spring 43 and the pressure regulating spring 33, that is, b, are always the same. For the same compression value of the spring, that is, b, the spring force of the detection spring 43 and the spring force of the pressure regulating spring 33 can be calculated according to the above formula. Furthermore, through multiple experiments, multiple sets of the spring force of the detection spring 43 and the spring force of the pressure regulating spring 33 can be obtained and made into a table, thereby obtaining the corresponding relationship between the spring force of the detection spring 43 and the spring force of the pressure regulating spring 33. Then, based on the table and the detection value of the weight sensor 5, the pressure relief pressure is obtained, and the pressure relief pressure is equal to the extraction pressure.

[0121] Wherein, a is the pre-compression amount of the spring, in mm; b is the compression value of the spring, in mm; G is the die-cutting modulus of the material, in MPa; d is the diameter of the spring wire, in mm; n is the number of effective turns of the spring; D is the mean diameter of the spring, in mm.

[0122] It should be noted that: the above method is also applicable to the scheme of replacing the weight sensor 5 with a pressure sensor. Convert the pressure value detected by the pressure sensor into a weight value (that is, the pressure value detected by the pressure sensor / (9.8 N / kg)), which is the pressure relief pressure of the pressure regulating valve 3, and the pressure relief pressure is equal to the extraction pressure.

[0123] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A coffee machine pressure regulating device, characterized in that: include: A driving device, a gear transmission assembly, a pressure regulating valve, a detection assembly and a pressure sensor or a weight sensor; wherein the pressure regulating valve comprises a pressure regulating piston rod and a pressure regulating piston, and the pressure regulating piston rod is threadedly connected to the pressure regulating piston; the detection assembly comprises a detection piston rod, a detection piston, a detection spring, a force-applying member and a mounting seat; The mounting seat is formed with a mounting cavity and two avoidance through holes communicating with the mounting cavity; the detection piston is movably arranged in the mounting cavity through one of the avoidance through holes; the detection piston rod is threadedly connected to the detection piston; the detection spring is arranged in the mounting cavity, and the two ends of the spring are respectively connected to the detection piston and the force-applying member; The pressure sensor or the weight sensor is arranged on a side of the mounting seat away from the detection piston, and the force-applying member can move with the detection piston, and can then apply different pressures to the pressure sensor or the weight sensor through the other avoidance through hole; the driving device is respectively connected to the pressure regulating piston rod and the detection piston rod through the gear transmission assembly, and can respectively drive the pressure regulating piston rod and the detection piston rod to rotate synchronously, so that the pressure regulating piston and the detection piston move in a direction closer to or farther away from each other.

2. The coffee machine pressure regulating device according to claim 1, characterized in that: The pressure regulating piston rod, the detection piston rod, and the gear in the gear transmission assembly fixedly connected to the pressure regulating piston rod and the detection piston rod are coaxially arranged.

3. The coffee machine pressure regulating device according to claim 1, characterized in that: The gear transmission assembly includes a first gear and a second gear; wherein the first gear is connected to the driving end of the driving device, and the second gear is fixedly connected to the pressure regulating piston rod and the detection piston rod respectively, and the second gear can drive the pressure regulating piston rod and the detection piston rod to rotate synchronously.

4. The coffee machine pressure regulating device according to claim 1, characterized in that: A first limiting boss is formed on the outer wall of the detection piston rod, and the first limiting boss abuts against the top or bottom of a gear in the gear transmission assembly matched with the detection piston rod.

5. The coffee machine pressure regulating device according to claim 1, characterized in that: The detection assembly also includes a first sealing ring. The outer wall of the detection piston is provided with a first groove. The first sealing ring is installed in the first groove.

6. The coffee machine pressure regulating device according to claim 1, characterized in that: The pressure regulating valve comprises the pressure regulating piston rod, the pressure regulating piston, a pressure regulating spring, a sealing member and a valve seat; wherein the valve seat is formed with a cavity with an end opening and a water inlet and a pressure relief port respectively connected to the cavity; The pressure-regulating piston is movably arranged in the cavity; the pressure-regulating piston rod is threadably connected to the pressure-regulating piston; the pressure-regulating spring and the sealing component are both arranged in the installation cavity, and the two ends of the pressure-regulating spring are respectively connected to the pressure-regulating piston and the sealing component; the sealing component is arranged corresponding to the water inlet and can cover the water inlet.

7. The coffee machine pressure regulating device according to claim 6, characterized in that: A second limiting boss is formed on the outer wall of the pressure regulating piston rod, and the second limiting boss abuts against the top or bottom of a gear in the gear transmission assembly matched with the pressure regulating piston rod.

8. The coffee machine pressure regulating device according to claim 6, characterized in that: The pressure regulating valve further includes a second sealing ring. A second groove is formed on the outer wall of the pressure regulating piston. The second sealing ring is installed in the second groove.

9. A coffee machine extraction system, characterized in that: It comprises a water tank, a pump, a boiler, a valve, an extraction head and a coffee machine pressure regulating device as described in any one of claims 1 to 8; wherein the water tank, the pump, the boiler, the valve and the extraction head are connected in sequence; and the pipeline connecting the pump and the boiler is connected to the water inlet of the regulating valve of the coffee machine pressure regulating device.

10. The coffee machine extraction system according to claim 9, characterized in that: The coffee machine extraction system further comprises a pressure sensor, and the pressure sensor is arranged on a pipeline connected between the extraction head and the valve; and / or The valve is a solenoid valve.

Images