Coffee machine pressure regulating device and coffee machine extraction system

Abstract

The utility model relates to the technical field of coffee machines, in particular to a coffee machine pressure regulating device and a coffee machine extraction system.The coffee machine pressure regulating device comprises a driving device, a gear transmission assembly, a pressure regulating valve, an encoder gear and an encoder; the pressure regulating valve comprises a piston rod and a piston, and the piston rod and the piston are rotationally connected in a threaded mode. The driving device is connected with a piston rod of the pressure regulating valve through a gear transmission assembly and can drive the piston rod to rotate synchronously so that the piston can move in the preset direction. The encoder gear is in transmission connection with the gear transmission assembly; and the rotating part of the encoder is fixedly connected with the central shaft of the encoder gear. According to the pressure adjusting device of the coffee machine, the pipeline pressure can be effectively controlled, adjustment of various different extraction pressures is achieved, different extraction requirements are met, a novel pressure changing method is provided, the use experience of a user is improved, and coffee with different tastes can be extracted.

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 frequency conversion 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 frequency conversion, 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, an encoder gear, and an encoder; wherein, the pressure regulating valve includes a piston rod and a piston, and the piston rod is in threaded rotational connection with the piston;

[0005] The driving device is connected to the piston rod of the pressure regulating valve through the gear transmission assembly and can drive the piston rod to rotate synchronously so that the piston moves along a preset direction; the encoder gear is in transmission connection with the gear transmission assembly; the rotating part of the encoder is fixedly connected to the central axis of the encoder gear.

[0006] In the above technical solution, further, the piston rod and the gear in the gear transmission assembly fixedly connected to the piston rod are coaxially arranged.

[0007] In any of the above technical solutions, further, the gear transmission assembly includes a first transmission gear and a second transmission gear; wherein, the first transmission gear is connected to the driving end of the driving device, the second transmission gear is fixedly connected to the piston rod of the pressure regulating valve, and the second transmission gear can drive the piston rod to rotate synchronously; the second transmission gear is meshed with the first transmission gear and the encoder gear respectively.

[0008] In any of the above technical solutions, further, the second transmission gear is formed with a central axis hole, and the piston rod is inserted into the central axis hole.

[0009] In any of the above technical solutions, further, the pressure regulating valve includes the piston rod, the piston, a spring, a sealing member, and a valve seat; wherein, the valve seat is formed with an installation cavity having an end opening, and a water inlet and a pressure relief port that are respectively communicated with the installation cavity;

[0010] The piston is movably disposed in the installation cavity; the piston rod is in threaded rotational connection with the piston; the spring and the sealing member are both disposed in the installation cavity, and two ends of the spring are respectively connected to the piston and the sealing member; the sealing member is disposed corresponding to the water inlet and can block the water inlet.

[0011] In any of the above technical solutions, further, a limiting boss is formed on an outer wall of the piston rod, and the limiting boss abuts against a top or a bottom of a structure of the gear transmission assembly that cooperates with the piston rod.

[0012] In any of the above technical solutions, further, the pressure regulating valve further includes a sealing ring, a groove is formed on an outer wall of the piston, and the sealing ring is installed in the groove.

[0013] In any of the above technical solutions, further, the number of the sealing rings is multiple, and the multiple sealing rings are sequentially arranged at intervals along a moving direction of the piston.

[0014] The present application further 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 details are not described herein again.

[0015] 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 communicated; a pipeline through which the pump is communicated with the boiler is communicated with a water inlet of a regulating valve of the coffee machine pressure regulating device.

[0016] 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 a pipeline that is communicated between the extraction head and the valve.

[0017] In any of the above technical solutions, further, the valve is an electromagnetic valve.

[0018] The present application further provides a coffee machine automatic pressure regulating method for the coffee machine pressure regulating device or the coffee machine extraction system according to 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 details are not described herein again.

[0019] In the above technical solution, further, the automatic pressure regulation method of the coffee machine includes the following steps:

[0020] 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, and the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, and then drives the piston to move along a preset direction to perform a pressure relief operation. At the same time, the driving device synchronously drives the encoder gear to rotate through the gear transmission assembly, and then synchronously drives the rotating part of the encoder to rotate until the value of the encoder reaches a preset value, and the driving device stops working. The extraction operation continues until it is completed or when the next pressure change instruction appears, the driving device is driven again, and the above steps are repeated to adjust the pressure.

[0021] In any of the above technical solutions, further, in the state where the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, and then drives the piston to move along a preset direction to perform a pressure relief operation, and synchronously drives the encoder gear to rotate, and then synchronously drives the rotating part of the encoder to rotate, according to the rotation angle R of the encoder, the moving distance b of the piston is obtained as R / (360×L), where L is the thread pitch of the piston rod;

[0022] Then, according to the moving distance of the piston, the deformation amount f of the spring is obtained as f = a ± b = a ± R / (360×L);

[0023] Then, according to the deformation amount of the spring, the spring pressure F of the spring during pressure relief is obtained as F = f×G×d 4 / (8×n×D 3 ) = [a ± R / (360×L)]×G×d 4 / (8×n×D 3 ), where a is the pre-compression amount 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;

[0024] Since the spring pressure of the spring is equal to the pressure relief pressure, the relationship between the pressure relief pressure and the rotation angle of the encoder is finally obtained, and the pressure is adjusted according to this relationship.

[0025] This application also provides an automatic pressure regulation 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 automatic pressure regulation method of the coffee machine includes the following steps:

[0027] When the extraction starts and a pressure change instruction from the user is obtained, the coffee machine performs an active pressure change operation, activates the driving device, and the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, thereby driving the piston to move along a preset direction to perform a pressure relief operation. At the same time, the driving device synchronously drives the encoder gear to rotate through the gear transmission assembly, thereby synchronously driving the rotating part of the encoder to rotate until the value of the encoder reaches a preset value, at which point the driving device stops working, and the extraction operation continues until completion or when the next pressure change instruction appears, the driving device is re-driven, and the above steps are repeated to adjust the pressure;

[0028] When the extraction starts and a pressure change instruction from the user is not obtained, the coffee machine performs a passive pressure change operation. According to the extraction pressure detected by the pressure sensor, the driving device is activated, and the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, thereby driving the piston to move along a preset direction to perform a pressure relief operation until the pressure value detected by the pressure sensor reaches a preset value, at which point the driving device stops working, and the extraction operation continues until completion.

[0029] In any of the above technical solutions, further, in the state where the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, thereby driving the piston to move along a preset direction to perform a pressure relief operation, and synchronously drives the encoder gear to rotate, thereby synchronously driving the rotating part of the encoder to rotate, according to the rotation angle R of the encoder, the moving distance b of the piston is obtained as R / (360×L), where L is the thread pitch of the piston rod;

[0030] Then, according to the moving distance of the piston, the deformation amount f of the spring is obtained as f = a ± b = a ± R / (360×L);

[0031] Then, according to the deformation amount of the spring, the spring pressure F of the spring during pressure relief is obtained as F = f×G×d 4 / (8×n×D 3 ) = [a ± R / (360×L)]×G×d 4 / (8×n×D 3 ), where a is the pre-compression amount of the spring; G is the die-cutting modulus of the material; d is the diameter of the spring wire; n is the number of effective turns of the spring; D is the mean diameter of the spring;

[0032] Since the spring pressure of the spring is equal to the pressure relief pressure, the relationship between the pressure relief pressure and the rotation angle of the encoder is finally obtained, and the pressure is adjusted according to this relationship.

[0033] Compared with the prior art, the beneficial effects of the present application are:

[0034] The coffee machine pressure regulating device provided by this application can effectively control the pipeline pressure, realize the regulation of a variety of different extraction pressures, meet different extraction requirements, that is, provide a new variable pressure method, improve the user experience, and be able to extract coffee with different tastes. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of this 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 this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a schematic structural diagram of the coffee machine pressure regulating device provided by the embodiment of this application;

[0037] Figure 2 It is a partial structural schematic diagram of the coffee machine pressure regulating device provided by the embodiment of this application;

[0038] Figure 3 It is another schematic structural diagram of the coffee machine pressure regulating device provided by the embodiment of this application;

[0039] Figure 4 is Figure 3 A cross-sectional view along the A-A section;

[0040] Figure 5 It is a schematic structural diagram of the coffee machine extraction system provided by the embodiment of this application;

[0041] Figure 6 It is another schematic structural diagram of the coffee machine extraction system provided by the embodiment of this application.

[0042] Reference numerals:

[0043] 1 - driving device, 2 - gear transmission assembly, 21 - first transmission gear, 22 - second transmission gear, 3 - pressure regulating valve, 31 - valve seat, 311 - water inlet, 312 - pressure relief port, 32 - sealing member, 321 - bracket, 322 - sealing silica gel, 33 - spring, 34 - piston, 35 - piston rod, 351 - limit boss, 36 - sealing ring, 4 - encoder gear, 5 - encoder, 6 - outer cover, 10 - water tank, 20 - pump, 30 - coffee machine pressure regulating device, 40 - boiler, 50 - valve, 60 - pressure sensor, 70 - extraction head, 80 - controller, 801 - operation panel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0045] Generally, the components of the embodiments of the present application described and shown in the accompanying drawings herein 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 present application claimed, but merely represents selected embodiments of the present application.

[0046] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0047] 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 accompanying 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 of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0048] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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 circumstances.

[0049] Next, refer 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.

[0050] Embodiment 1

[0051] See Figures 1 to 4 As shown, an embodiment of the present application provides a coffee machine pressure regulating device 30, including: a driving device 1, a gear transmission assembly 2, a pressure regulating valve 3, an encoder gear 4, and an encoder 5; wherein, the pressure regulating valve 3 includes a piston rod 35 and a piston 34, and the piston rod 35 is in threaded rotation connection with the piston 34;

[0052] The driving device 1 is connected to the piston rod 35 of the pressure regulating valve 3 through the gear transmission assembly 2 and can drive the piston rod 35 to rotate synchronously, so that the piston 34 moves along a preset direction. It can be seen that the structure of the existing pressure regulating valve 3 is changed. The piston rod 35 and the piston 34 are changed from the original fixed connection to a threaded rotational connection. Thus, during the rotation of the piston rod 35, the piston 34 will be driven to move; the encoder gear 4 is in transmission connection with the gear transmission assembly 2; the rotating part of the encoder 5 is fixedly connected to the central axis of the encoder gear 4.

[0053] According to the structure described above, the pressure regulating process of the coffee machine pressure regulating device 30 of the present application is as follows:

[0054] 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, and the driving device 1 drives the piston rod 35 to rotate synchronously through the gear transmission assembly 2. Then, the piston 34 is driven to move along a preset direction to perform a pressure relief operation. At the same time, the driving device 1 synchronously drives the encoder gear 4 to rotate through the gear transmission assembly 2, and then synchronously drives the rotating part of the encoder 5 to rotate until the value of the encoder 5 reaches a preset value, at which time the driving device 1 stops working, and the extraction operation continues until completion or when the next variable pressure instruction appears, the driving device 1 is driven again, and the above steps are repeated for pressure adjustment.

[0055] It can be seen that the coffee machine pressure regulating device 30 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.

[0056] It should be noted that: according to the rotation angle R of the encoder 5, the moving distance b of the piston 34 is obtained as R / (360×L), where L is the thread pitch of the piston rod 35;

[0057] Then, according to the moving distance of the piston 34, the deformation amount f of the spring 33 is obtained as f = a ± b = a ± R / (360×L);

[0058] Then, according to the deformation amount of the spring 33, the spring pressure F of the spring 33 during pressure relief is obtained as F = f×G×d 4 / (8×n×D 3 ) = [a ± R / (360×L)]×G×d 4 / (8×n×D 3 ), where a is the pre-compression amount of the spring 33, in mm; b is the compression value of the spring 33, in mm; G is the die-cutting modulus of the material, in MPa; d is the diameter of the spring wire of the spring 33, in mm; n is the number of effective turns of the spring 33; D is the mean diameter of the spring 33, in mm;

[0059] Since the spring pressure of the spring 33 is equal to the pressure relief pressure, the relationship between the pressure relief pressure and the rotation angle of the encoder 5 is finally obtained, and the pressure adjustment is carried out according to this relationship.

[0060] In this embodiment, preferably, as Figures 2 to 4 shown, the gear transmission assembly 2 includes a first transmission gear 21 and a second transmission gear 22; wherein, the first transmission gear 21 is connected to the driving end of the driving device 1, the second transmission gear 22 is fixedly connected to the piston rod 35 of the pressure regulating valve 3, and the second transmission gear 22 can drive the piston rod 35 to rotate synchronously; the second transmission gear 22 meshes with the first transmission gear 21 and the encoder gear 4 respectively.

[0061] According to the structure described above, under the transmission action of the two transmission gears, the driving device 1 and the pressure regulating valve 3 can be arranged on the left and right sides respectively, increasing the width space or the length space, saving the space in the height direction, avoiding the problem of the excessive height of the whole machine caused by directly driving the piston rod 35 by the driving device 1, and making the whole machine more stable.

[0062] 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.

[0063] Further, preferably, the coffee machine pressure regulating device 30 further includes an outer cover 6, and a part of the gear assembly and the piston rod 35 are arranged in the outer cover 6, which plays a role in protecting the gear transmission assembly 2 and the piston rod 35. And preferably, the outer cover 6 is provided with a first through hole for avoiding the piston 34 and the piston rod 35, and the outer cover 6 is provided with a second through hole for avoiding the rotating part of the encoder 5.

[0064] Further, preferably, the outer cover 6 includes a box and a cover plate, and the box and the cover plate are detachably connected, which is convenient for later maintenance. And preferably, the cover plate is provided with a second through hole, and the box body is provided with a first through hole.

[0065] In this embodiment, preferably, as Figure 4 shown, the second transmission gear 22 is formed with a central shaft hole, and the piston rod 35 is inserted into the central shaft hole.

[0066] According to the structure described above, there is no need to design an adapter component, and the piston rod 35 is directly used as the central shaft of the second transmission gear 22, so that the two can rotate synchronously, and the accuracy requirement is ensured, which helps to improve the accuracy of pressure adjustment.

[0067] Furthermore, preferably, the piston rod 35 is adapted or interference fit with the central axis hole of the second gear, and in order to prevent the piston rod 35 from rotating relative to the second gear, one of the piston rod 35 and the inner wall of the central axis hole can be designed with a positioning protrusion, and the other of the two can be designed with a positioning groove, and the positioning protrusion is inserted into the positioning groove, thereby playing a role in positioning and preventing relative rotation.

[0068] Further, preferably, the piston rod 35 and the central axis hole of the second gear can be connected by plugging or threading.

[0069] In this embodiment, preferably, Figure 4 As shown, the pressure regulating valve 3 includes a piston rod 35, a piston 34, a spring 33, a sealing member 32 and a valve seat 31; wherein the valve seat 31 is formed with an installation cavity with an end opening and a water inlet 311 and a pressure relief port 312 respectively connected to the installation cavity;

[0070] The piston 34 is movably arranged in the installation cavity; the piston rod 35 is threadedly connected to the piston 34; the spring 33 and the sealing member 32 are both arranged in the installation cavity, and the two ends of the spring 33 are respectively connected to the piston 34 and the sealing member 32, and preferably, the length direction of the valve seat 31, the length direction of the installation cavity, the length direction of the piston rod 35 and the moving direction of the piston 34 are all the same; the sealing member 32 is arranged corresponding to the water inlet 311, and can cover the water inlet 311.

[0071] According to the structure described above, when the piston rod 35 rotates, it will drive the piston 34 to move up and down, thereby adjusting the compression amount of the spring 33, and then adjusting the gap between the sealing component 32 and the water inlet 311, that is, the tightness of the fit, thereby adjusting the flow rate and then adjusting the pressure.

[0072] Further, preferably, the water inlet 311 can be set at the bottom of the valve seat 31, and the pressure relief port 312 can be set at the side of the valve seat 31. Of course, it is not limited to this, and it can also be designed according to actual needs. For example, the water inlet 311 can be set at the top of the valve seat 31, and the pressure relief port 312 can be set at the side of the valve seat 31, and so on. Or the positions of the water inlet 311 and the pressure relief port 312 can be interchanged, and the design can be specifically based on actual needs.

[0073] Further, preferably, the sealing member 32 includes a bracket 321 and a sealing silicone 322 block, wherein the bracket 321 is a convex block, and the convex top of the convex block is inserted into one end of the spring 33, and the end of the convex block away from the spring 33 is provided with a groove, and the sealing silicone 322 block is filled and fixed in the groove. Of course, the structure of the sealing member 32 is not limited to this, and it can also be a whole block, etc., which is specifically designed according to actual needs.

[0074] In this embodiment, preferably,Figure 4 As shown, a limiting boss 351 is formed on the outer wall of the piston rod 35, and the limiting boss 351 abuts against the bottom of the structure of the gear transmission assembly 2 that cooperates with the piston rod 35. That is to say, the limiting boss 351 abuts against the bottom of the aforementioned second gear. Of course, it is not limited to this. When the piston rod 35 is arranged on one side of the top of the second gear, the limiting boss 351 abuts against the top of the second gear.

[0075] According to the structure described above, it can be seen that the limiting protrusion plays a role in installation and limitation, making the piston rod 35 fixed relative to the second transmission gear 22, that is, preventing the piston rod 35 from moving relative to the second transmission gear 22, thereby ensuring the assembly accuracy of the two and finally realizing synchronous rotation.

[0076] Furthermore, preferably, the limiting protrusion can be annular, or the limiting protrusion is a block, and the number thereof is multiple. The multiple limiting protrusions are evenly spaced along the outer circumference of the piston rod 35. Of course, it is not limited to this, and it is specifically designed according to actual needs.

[0077] In this embodiment, preferably, as Figure 4 shown, the pressure regulating valve 3 further includes a sealing ring 36. A groove is formed on the outer wall of the piston 34, and the sealing ring 36 is installed in the groove.

[0078] According to the structure described above, it can be seen that as the piston rod 35 moves, when the sealing ring 36 abuts against the inner wall of the installation cavity of the valve seat 31, it plays a sealing role to prevent water leakage, thereby avoiding damage to the ground gear, the encoder 5, and the driving device 1.

[0079] Furthermore, preferably, the number of the sealing rings 36 is multiple, and they are sequentially spaced along the moving direction of the piston 34.

[0080] In this embodiment, preferably, the driving device 1 is a motor, which can rotate forward and backward, thereby driving the piston rod 35 to move along two opposite directions respectively, so as to adjust the magnitude of the spring 33 pressure of the pressure regulating valve 3.

[0081] Embodiment 2

[0082] Refer to Figure 5 shown, Embodiment 2 of the present application further provides a coffee machine extraction system, including the coffee machine pressure regulating device 30 described in Embodiment 1 above. Therefore, it has all the beneficial technical effects of the coffee machine pressure regulating device 30, and the same technical features and beneficial effects will not be repeated.

[0083] In this embodiment, preferably, as Figure 5As shown in the figure, the coffee machine extraction system further includes a water tank 10, a pump 20, a boiler 40, a valve 50 (such as an electromagnetic valve) and an extraction head 70; among them, the water tank 10, the pump 20, the boiler 40, the valve 50 and the extraction head 70 are connected in series in sequence; the pipeline connecting the pump 20 and the boiler 40 is connected to the water inlet 311 of the regulating valve of the coffee machine pressure regulating device 30.

[0084] According to the above description, it can be known that in this system, the coffee machine pressure regulating device 30 can be used to perform various regulations on the pipeline pressure in the extraction system, so as to achieve various different extraction pressures, meet different extraction requirements, that is, a new variable pressure method is provided, which improves the user experience and can extract coffee with different tastes.

[0085] Embodiment III

[0086] Embodiment III of the present application also provides a coffee machine automatic pressure regulating method for the coffee machine pressure regulating device 30 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 regulating device 30 or the coffee machine extraction system, and the same technical features and beneficial effects will not be repeated.

[0087] In this embodiment, preferably, as Figures 1 to 5 shown, the coffee machine automatic pressure regulating method includes the following steps:

[0088] 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, and the driving device 1 drives the piston rod 35 to rotate synchronously through the gear transmission assembly 2, and then drives the piston 34 to move along the preset direction for pressure relief operation. At the same time, the driving device 1 synchronously drives the encoder gear 4 to rotate through the gear transmission assembly 2, and then synchronously drives the rotating part of the encoder 5 to rotate until the value of the encoder 5 reaches the preset value, and the driving device 1 stops working. The extraction operation continues until it is completed or when the next variable pressure instruction appears, the driving device 1 is restarted, and the above steps are repeated for pressure adjustment.

[0089] According to the above description, it can be known that this method is an active variable pressure method, that is to say, initially the user sets the pressure value according to his own needs, and then according to this set pressure value, the coffee machine pressure regulating device 30 is used for regulation, and finally the extraction pressure required by the customer is achieved. It can be seen that according to the above method steps, the pipeline pressure can be effectively controlled, the regulation of various different extraction pressures can be realized, different extraction requirements can be met, that is, a new variable pressure method is provided, which improves the user experience and can extract coffee with different tastes.

[0090] It should be noted that: the pump 20, the boiler 40, the valve 50 such as a solenoid valve, the encoder 5, the driving device 1, etc. are respectively communicatively connected to the controller 80. In combination with the above method, they are used to achieve automatic control. And this controller 80 can be designed independently or integrated with the main controller 80 of the coffee machine, which is specifically designed according to actual needs. In addition, the controller 80 is provided with an operation panel 801.

[0091] Furthermore, preferably, for the step of the user issuing a pressure change instruction, specifically, the user first sets the extraction pressure, and the controller 80 will obtain the value of the encoder 5 corresponding to this extraction pressure, that is, the preset value. Then, it further controls the driving device 1 to start working, and finally makes the encoder 5 reach the preset value from the initial value, thereby completing the active pressure regulation.

[0092] In this embodiment, preferably, the relational expression between the pressure relief pressure and the rotation angle of the encoder 5 is obtained according to the following method:

[0093] According to the rotation angle R of the encoder 5, the moving distance b of the piston 34 is obtained as R / (360×L), where L is the thread pitch of the piston rod 35;

[0094] Then, according to the moving distance of the piston 34, the deformation amount f of the spring 33 is obtained as f = a ± b = a ± R / (360×L);

[0095] Then, according to the deformation amount of the spring 33, the spring pressure F of the spring 33 during pressure relief is obtained as F = f×G×d 4 / (8×n×D 3 ) = [a ± R / (360×L)]×G×d 4 / (8×n×D 3 ), where a is the pre-compression amount of the spring 33, in mm; b is the compression value of the spring 33, in mm; G is the die-cutting modulus of the material, in MPa; d is the diameter of the spring wire of the spring 33, in mm; n is the number of effective turns of the spring 33; D is the mean diameter of the spring 33, in mm;

[0096] Since the spring pressure of the spring 33 is equal to the pressure relief pressure, the relational expression between the pressure relief pressure and the rotation angle of the encoder 5 is finally obtained, and the pressure is adjusted according to this relational expression.

[0097] Embodiment 4

[0098] 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 30 described in Embodiment 1 above. Therefore, it has all the beneficial technical effects of the coffee machine pressure regulating device 30, and the same technical features and beneficial effects will not be repeated.

[0099] In this embodiment, preferably, asFigure 6 As shown, the coffee machine extraction system further includes a water tank 10, a pump 20, a boiler 40, a valve 50, and an extraction head 70; among them, the water tank 10, the pump 20, the boiler 40, the valve 50, and the extraction head 70 are connected in sequence; the pipeline connecting the pump 20 and the boiler 40 is connected to the water inlet 311 of the regulating valve of the coffee machine pressure regulating device 30.

[0100] Further, preferably, as Figure 6 shown, the coffee machine extraction system further includes a pressure sensor 60, and the pressure sensor 60 is arranged on the pipeline connecting the extraction head 70 and the valve 50 for detecting the actual extraction pressure in real time.

[0101] According to the structure described above, this system has an active pressure change function and a passive pressure change function. Specifically, the above pressure change process is as follows:

[0102] 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, the driving device 1 drives the piston rod 35 to rotate synchronously through the gear transmission assembly 2, and then drives the piston 34 to move along a preset direction for pressure relief operation. At the same time, the driving device 1 synchronously drives the encoder gear 4 to rotate through the gear transmission assembly 2, and then synchronously drives the rotating part of the encoder 5 to rotate until the value of the encoder 5 reaches a preset value, and the driving device 1 stops working. The extraction operation continues until completion or when the next pressure change instruction appears, the driving device 1 is restarted, and the above steps are repeated for pressure adjustment.

[0103] 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 60, the driving device 1 is started, the driving device 1 drives the piston rod 35 to rotate synchronously through the gear transmission assembly 2, and then drives the piston 34 to move along a preset direction for pressure relief operation until the pressure value detected by the pressure sensor 60 reaches a preset value, and the driving device 1 stops working. The extraction operation continues until completion.

[0104] Combined with the above, the function of this system is relatively complete. It can not only perform active pressure change operation according to the user's needs to make coffee with a specific taste that meets the user's needs, but also perform passive pressure change operation, that is, when no pressure regulation instruction is received and there is a certain deviation between the detected actual extraction pressure and the ideal extraction pressure, it can automatically perform pressure regulation processing to make the extracted taste reach the best.

[0105] Example Five

[0106] Embodiment 5 of the present application further provides an automatic pressure regulation method for a coffee machine, which is used for the coffee machine extraction system described in Embodiment 4 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.

[0107] In this embodiment, preferably, as Figures 1 to 4 、 Figure 6 shown, the automatic pressure regulation method for the coffee machine includes the following steps:

[0108] 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 piston rod 35 to rotate synchronously through the gear transmission assembly 2, and then drives the piston 34 to move along a preset direction to perform a pressure relief operation. At the same time, the driving device 1 synchronously drives the encoder gear 4 to rotate through the gear transmission assembly 2, and then synchronously drives the rotating part of the encoder 5 to rotate until the value of the encoder 5 reaches a preset value, and the driving device 1 stops working. The extraction operation continues until it is completed or when the next pressure change instruction appears, the driving device 1 is restarted, and the above steps are repeated for pressure adjustment;

[0109] When the extraction is started and a pressure change instruction from the user is not obtained, the coffee machine performs a passive pressure change operation. According to the extraction pressure detected by the pressure sensor 60, the driving device 1 is started, and the driving device 1 drives the piston rod 35 to rotate synchronously through the gear transmission assembly 2, and then drives the piston 34 to move along a preset direction to perform a pressure relief operation. At the same time, the driving device 1 synchronously drives the encoder gear 4 to rotate through the gear transmission assembly 2, and then synchronously drives the rotating part of the encoder 5 to rotate until the pressure value detected by the pressure sensor 60 reaches a preset value, and the driving device 1 stops working. The extraction operation continues until it is completed.

[0110] According to the above description, the above provides two pressure regulation methods, namely the active pressure regulation method and the passive pressure regulation method. The active pressure regulation method can perform an active pressure change operation according to the user's needs to make coffee with a specific taste that meets the user's needs. The passive pressure regulation method is specifically 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.

[0111] In this embodiment, preferably, when the coffee machine performs an active pressure change operation, the relational expression between the pressure relief pressure and the rotation angle of the encoder 5 is obtained according to the following method:

[0112] According to the rotation angle R of the encoder 5, the moving distance b of the piston 34 is obtained as R / (360×L), where L is the thread pitch of the piston rod 35;

[0113] According to the moving distance of the piston 34, the deformation amount f of the spring 33 is obtained as f = a ± b = a ± R / (360×L);

[0114] According to the deformation amount of the spring 33, the spring force F of the spring 33 during pressure relief is obtained as F = f×G×d 4 / (8×n×D 3 ) = [a ± R / (360×L)]×G×d 4 / (8×n×D 3 ), where a is the pre-compression amount of the spring 33, in mm; b is the compression value of the spring 33, in mm; G is the die-cutting modulus of the material, in MPa; d is the diameter of the spring wire of the spring 33, in mm; n is the number of effective turns of the spring 33; D is the mean diameter of the spring 33, in mm;

[0115] Since the spring force of the spring 33 is equal to the pressure relief pressure, the relationship between the pressure relief pressure and the rotation angle of the encoder 5 is finally obtained, and the pressure is adjusted according to this relationship.

[0116] It should be noted that: the aforementioned coffee machine pressure regulating device 30 further includes a controller 80, and the controller 80 is respectively communicatively connected to the pump 20, the boiler 40, the valve 50, the pressure sensor 60, the encoder 5, the driving device 1, etc., and is used to achieve automatic control in cooperation with the above method. And this controller 80 can be designed separately or integrated with the total controller 80 of the coffee machine, and is specifically designed according to actual needs.

[0117] 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, an encoder gear and an encoder; wherein the pressure regulating valve comprises a piston rod and a piston, and the piston rod is rotationally connected to the piston by a thread; The driving device is connected to the piston rod of the pressure regulating valve through the gear transmission assembly, and can drive the piston rod to rotate synchronously so that the piston moves along a preset direction; the encoder gear is transmission-connected to the gear transmission assembly; the rotating part of the encoder is fixedly connected to the central axis of the encoder gear.

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

3. The coffee machine pressure regulating device according to claim 2, characterized in that: The gear transmission assembly includes a first transmission gear and a second transmission gear; wherein the first transmission gear is connected to the driving end of the driving device, the second transmission gear is fixedly connected to the piston rod of the pressure regulating valve, and the second transmission gear can drive the piston rod to rotate synchronously; the second transmission gear is respectively meshed with the first transmission gear and the encoder gear.

4. The coffee machine pressure regulating device according to claim 3, characterized in that: The second transmission gear is formed with a central shaft hole, and the piston rod is inserted into the central shaft hole.

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

6. The coffee machine pressure regulating device according to claim 5, characterized in that: The outer wall of the piston rod forms a limiting boss, and the limiting boss abuts against the top or bottom of the structure of the gear transmission assembly matched with the piston rod.

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

8. The coffee machine pressure regulating device according to claim 7, characterized in that: There are multiple sealing rings, and the multiple sealing rings are sequentially arranged at intervals along the moving direction of the piston.

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.

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