Coffee machine pressure regulating device, coffee machine extraction system, and coffee machine pressure regulating method

Abstract

The present application relates to the technical field of coffee machines, and in particular to a coffee machine pressure regulating device, a coffee machine extraction system, and a coffee machine pressure regulating method. 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 is threadedly and rotatably connected to the piston; the driving device is connected to the piston rod of the pressure regulating valve by means of the gear transmission assembly, and can drive the piston rod to rotate synchronously, so that the piston moves in a preset direction; the encoder gear is transmittingly connected to the gear transmission assembly; and a rotating portion of the encoder is fixedly connected to a central shaft of the encoder gear. The coffee machine pressure regulating device provided in the present application can effectively control the pressure in pipes, realize the regulation of a variety of different extraction pressures, and meet different extraction requirements. That is, provided is a novel pressure changing method, improving use experience of a user, and extracting coffee with different tastes.

Description

Coffee machine pressure regulating device, coffee machine extraction system and coffee machine pressure regulating method

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 2024219461117, filed on August 12, 2024, and entitled "Coffee machine pressure regulating device and coffee machine extraction system", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of coffee machines, in particular to a coffee machine pressure regulating device, a coffee machine extraction system and a coffee machine pressure regulating method. BACKGROUND

[0004] At present, the pressure change of the coffee machine on the market is usually achieved by changing the pressure in the coffee pipeline through pump frequency conversion, which is a relatively effective method. However, the price of the frequency conversion rotary pump is very expensive, resulting in a low cost performance. In addition, the pump has the function of frequency conversion, which leads to changes and instability of water flow. Therefore, a pressure regulating valve is usually used for pressure regulation. However, the pressure regulating valve scheme also has certain problems. The pressure regulating valve can only perform one kind of pressure regulation and cannot perform multiple different pressure regulations according to the extraction needs.

[0005] SUMMARY

[0006] The present application aims to provide a coffee machine pressure regulating device, a coffee machine extraction system and a coffee machine pressure regulating method, which solves the technical problem that the pressure regulating valve of the coffee machine in the prior art can only perform one kind of pressure regulation and cannot meet different extraction pressure needs.

[0007] The present application provides a coffee machine pressure regulating device, comprising 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 is threadedly connected with the piston.

[0008] The driving device is connected with 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 drivingly connected with the gear transmission assembly. The rotating part of the encoder is fixedly connected with the center shaft of the encoder gear.

[0009] In the technical scheme, further, the gear transmission assembly comprises a first transmission gear and a second transmission gear; the first transmission gear is connected with the driving end of the driving device; the second transmission gear is fixedly connected with 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 engaged with the first transmission gear and the encoder gear respectively.

[0010] In any of the above technical schemes, further, the second transmission gear is formed with a central shaft hole, and the piston rod is inserted into the central shaft hole.

[0011] In any of the above technical schemes, further, the pressure regulating valve comprises the piston rod, the piston, a spring, a sealing member and a valve seat; the valve seat is formed with an installation cavity with an open end, and a water inlet and a pressure relief opening which are communicated with the installation cavity respectively;

[0012] The piston is movably arranged in the installation cavity; the piston rod is threadedly connected with the piston; the spring and the sealing member are arranged in the installation cavity, and two ends of the spring are connected with the piston and the sealing member respectively; the sealing member is arranged corresponding to the water inlet and can shield the water inlet.

[0013] In any of the above technical schemes, further, an outer wall of the piston rod is formed with 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.

[0014] In any of the above technical schemes, further, the pressure regulating valve further comprises a sealing ring, and an outer wall of the piston is provided with a groove, and the sealing ring is arranged in the groove.

[0015] The application also provides a coffee machine automatic pressure regulating method, which is used for the coffee machine pressure regulating device or the coffee machine extraction system in any of the above technical schemes, so that all the beneficial technical effects of the coffee machine pressure regulating device or the coffee machine extraction system are achieved, and details are not repeated here.

[0016] In the technical scheme, further, the coffee machine extraction system further comprises a water tank, a pump, a boiler, a valve and an extraction head; the water tank, the pump, the boiler, the valve and the extraction head are sequentially communicated; a pipeline, in which the pump and the boiler are communicated, is communicated with a water inlet of the adjusting valve of the coffee machine pressure regulating device.

[0017] In any of the above technical schemes, further, the coffee machine extraction system further comprises a pressure sensor, and the pressure sensor is arranged on a pipeline communicated between the extraction head and the valve.

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

[0019] This application also provides a coffee machine extraction system, including the coffee machine pressure regulating device described in any of the above technical solutions, and thus has all the beneficial technical effects of the coffee machine pressure regulating device, which will not be repeated here.

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

[0021] When extraction is initiated and a user's pressure adjustment command is received, the coffee machine performs an active pressure adjustment operation, activating the drive unit. The drive unit drives the piston rod to rotate synchronously via the gear transmission assembly, thereby driving the piston to move along a preset direction to perform a pressure relief operation. Simultaneously, the drive unit drives the encoder gear to rotate synchronously via the gear transmission assembly, thereby synchronously driving the encoder's rotating part to rotate until the encoder value reaches the preset value. The drive unit then stops working, and the extraction operation continues until completion, or when the next pressure adjustment instruction appears, the drive unit is reactivated, and the above steps are repeated to adjust the pressure.

[0022] In any of the above technical solutions, further, when 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, the moving distance b of the piston is obtained as R / (360×L) according to the rotation angle R of the encoder, where L is the thread pitch of the piston rod;

[0023] Based on the piston's movement distance, the spring deformation f = a ± b = a ± R / (360 × L) is obtained.

[0024] Based on the deformation of the spring, the spring pressure F during decompression is calculated 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 preload 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 coils of the spring; and D is the mean diameter of the spring;

[0025] Since the spring pressure and the relief pressure are equal, the relationship between the relief pressure and the rotation angle of the encoder is finally obtained, and the pressure is adjusted according to this relationship.

[0026] The application further provides a coffee machine automatic pressure regulating method for the coffee machine extraction system, thus having all the beneficial technical effects of the coffee machine extraction system, which will not be repeated here.

[0027] In the above technical solution, further, the coffee machine automatic pressure regulating method comprises the following steps:

[0028] When the extraction is started and the user's pressure change instruction is obtained, the coffee machine performs an active pressure change operation, starts the driving device, the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, and then drives the piston to move in a preset direction to perform pressure relief operation. At the same time, the driving device drives the encoder gear to rotate synchronously through the gear transmission assembly, and then drives the rotating part of the encoder to rotate synchronously 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 the next pressure change instruction appears, the driving device is driven again, and the above steps are repeated to adjust the pressure.

[0029] When the extraction is started and the user's pressure change instruction is obtained, the coffee machine performs an active pressure change operation, starts the driving device, the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, and then drives the piston to move in a preset direction to perform pressure relief operation. At the same time, the driving device drives the encoder gear to rotate synchronously through the gear transmission assembly, and then drives the rotating part of the encoder to rotate synchronously 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 the next pressure change instruction appears, the driving device is driven again, and the above steps are repeated to adjust the pressure.

[0030] In any of the above technical solutions, further, in the state that the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, and then drives the piston to move in a preset direction to perform 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 rotating angle R of the encoder, the moving distance b of the piston is R / (360×L), wherein L is the thread pitch of the piston rod.

[0031] According to the moving distance of the piston, the deformation amount f of the spring is a±b=a±R / (360×L);

[0032] According to the deformation amount of the spring, the spring pressure F of the spring during pressure relief is f×G×d 4 / (8×n×D 3 )=[a±R / (360×L)]×G×d 4 / (8×n×D 3 ), wherein a is the pre-pressing 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, and D is the mean diameter of the spring.

[0033] 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 the relationship.

[0034] Compared with the prior art, the application has the following beneficial effects:

[0035] The coffee machine pressure regulating device provided by the application can effectively control the pipeline pressure, realize the adjustment of multiple different extraction pressures, meet different extraction requirements, that is, a new pressure changing method is provided, the use experience of the user is improved, and coffee with different tastes can be extracted. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0037] Fig. 1 is a structural schematic view of the coffee machine pressure regulating device provided by the embodiment of the application;

[0038] Fig. 2 is a partial structural schematic view of the coffee machine pressure regulating device provided by the embodiment of the application;

[0039] Fig. 3 is another structural schematic view of the coffee machine pressure regulating device provided by the embodiment of the application;

[0040] Fig. 4 is a sectional view along A-A of Fig. 3;

[0041] Fig. 5 is a structural schematic view of the coffee machine extraction system provided by the embodiment of the application;

[0042] Fig. 6 is another structural schematic view of the coffee machine extraction system provided by the embodiment of the application.

[0043] Reference signs: 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-limiting 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

[0044] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.

[0045] The components of the embodiments of the present application generally described and shown in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application.

[0046] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0047] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] The coffee machine pressure regulating device, coffee machine extraction system and coffee machine pressure regulating method according to some embodiments of the present application will be described below with reference to Figures 1 to 6.

[0050] Embodiment one

[0051] Referring to Figures 1 to 4, the embodiments of the present application provide a coffee machine pressure regulating device 30, comprising a driving device 1, a gear transmission assembly 2, a pressure regulating valve 3, an encoder 5 gear 4 and an encoder 5; wherein the pressure regulating valve 3 comprises a piston rod 35 and a piston 34, and the piston rod 35 is threadedly rotatably connected with the piston 34;

[0052] The driving device 1 is connected with 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 in 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 threaded rotary connection, so that the piston rod 35 drives the piston 34 to move during rotation. The encoder 5 gear 4 is in transmission connection with the gear transmission assembly 2. The rotating part of the encoder 5 is fixedly connected with the center shaft of the encoder 5 gear 4.

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

[0054] When the extraction is started and the user's pressure change instruction is obtained, the coffee machine performs 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 in a preset direction, performs pressure relief operation. At the same time, the driving device 1 drives the encoder 5 gear 4 to rotate synchronously 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, 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 driven again, and the above steps are repeated to adjust the pressure.

[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 multiple different extraction pressures, meet different extraction requirements, that is, a new pressure changing method is provided, the user's use experience is improved, and coffee with different tastes can be extracted.

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

[0057] According to the movement distance of the piston 34, the deformation amount f of the spring 33 is a±b=a±R / (360*L);

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

[0060] In this embodiment, preferably, as shown in FIGS. 2-4, the gear transmission assembly 2 comprises a first transmission gear 21 and a second transmission gear 22; wherein the first transmission gear 21 is connected with the driving end of the driving device 1, the second transmission gear 22 is fixedly connected with 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 is engaged with the first transmission gear 21 and the encoder 5 gear 4 respectively.

[0061] According to the above-described structure, 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, which increases the width space or length space, saves the space in the height direction, avoids the problem of excessive height of the whole machine when the driving device 1 directly drives the piston rod 35, and makes 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, but can be more than two, such as three or four, etc., which is designed according to actual needs.

[0063] Further, preferably, the coffee machine pressure regulating device 30 further comprises an outer cover 6, and the gear assembly and part of the structure of 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 comprises 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 shown in FIG. 4, 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 above-described structure, without designing an adapter member, 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 guaranteed, which helps to improve the accuracy of pressure regulation.

[0067] Further, preferably, the piston rod 35 is adapted to or interference-fitted with the central shaft hole of the second gear, and in order to avoid the relative rotation of the piston rod 35 with respect to the second gear, the piston rod 35 and the inner wall of the central shaft hole are designed with one of a positioning protrusion and the other of a positioning groove, and the positioning protrusion is inserted into the positioning groove, thereby playing a role of positioning and preventing relative rotation.

[0068] Further, preferably, the piston rod 35 is adapted to or interference-fitted with the central shaft hole of the second gear.

[0069] In this embodiment, preferably, as shown in FIG. 4, the pressure regulating valve 3 comprises 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 open end, and a water inlet 311 and a pressure relief port 312 which are respectively communicated with the installation cavity;

[0070] The piston 34 is movably arranged in the installation cavity; the piston rod 35 is threadedly connected with 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 with 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 shield the water inlet 311.

[0071] According to the above-described structure, when the piston rod 35 rotates, the piston 34 is driven to move up and down, thereby adjusting the compression amount of the spring 33, and further adjusting the gap between the sealing member 32 and the water inlet 311, i.e. the tightness of the cooperation, so as to adjust the flow rate and further adjust the pressure.

[0072] Further, preferably, the water inlet 311 can be arranged at the bottom of the valve seat 31, and the pressure relief port 312 is arranged at the side of the valve seat 31, of course, not limited thereto, but can be designed according to actual needs, for example, the water inlet 311 can be arranged at the top of the valve seat 31, and the pressure relief port 312 is arranged at the side of the valve seat 31, and the like, or the positions of the water inlet 311 and the pressure relief port 312 are interchanged, and the specific design is according to actual needs.

[0073] Further, preferably, the sealing member 32 comprises a bracket 321 and a sealing silica gel 322 block, wherein the bracket 321 is a convex block, the top of the convex block is inserted into one end of the spring 33, the end of the convex block away from the spring 33 is provided with a groove, and the sealing silica gel 322 block is filled and fixed in the groove. Of course, the structure of the sealing member 32 is not limited thereto, but can be a whole block, and the like, and the specific design is according to actual needs.

[0074] In this embodiment, preferably, as shown in FIG. 4, the outer wall of the piston rod 35 forms a limiting boss 351, and the limiting boss 351 abuts against the bottom of the structure of the gear transmission assembly 2 matched with the piston rod 35, that is, the limiting boss 351 abuts against the bottom of the second gear, of course, 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 above-described structure, the limiting boss plays a role of installing limiting, so that the piston rod 35 is fixed relative to the second transmission gear 22, that is, the movement of the piston rod 35 relative to the second transmission gear 22 is avoided, thereby ensuring the assembly precision of the two, and finally realizing the synchronous rotation.

[0076] Further, preferably, the limiting boss can be annular, or the limiting boss is a block, and the number of the limiting boss is multiple, and the multiple limiting bosses are arranged uniformly and spaced along the outer periphery of the piston rod 35, of course, not limited to this, and the specific design is according to the actual needs.

[0077] In this embodiment, preferably, as shown in FIG. 4, the pressure regulating valve 3 further comprises a sealing ring 36, and the outer wall of the piston 34 is provided with a groove, and the sealing ring 36 is installed in the groove.

[0078] According to the above-described structure, with the movement of the piston rod 35, when the sealing ring 36 abuts against the inner wall of the mounting cavity of the valve seat 31, a sealing role is played, water leakage is avoided, and damage of the gear, the encoder 5 and the driving device 1 is avoided.

[0079] Further, preferably, the number of the sealing ring 36 is multiple, and the multiple sealing rings are arranged sequentially and spaced along the movement direction of the piston 34.

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

[0081] Embodiment Two

[0082] Referring to FIG. 5, the embodiment two of the application further provides a coffee machine extraction system, which comprises the coffee machine pressure regulating device 30 of the above-described embodiment one, and thus 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 described herein.

[0083] In this embodiment, preferably, as shown in FIG. 5, the coffee machine extraction system further comprises a water tank 10, a pump 20, a boiler 40, a valve, and an extraction head 70; wherein the water tank 10, the pump 20, the boiler 40, the valve such as a solenoid valve, and the extraction head 70 are sequentially communicated; the pipeline through which the pump 20 communicates with the boiler 40 communicates with the water inlet 311 of the regulating valve of the coffee machine pressure regulating device 30.

[0084] As can be known from the above description, the coffee machine pressure regulating device 30 in the system can be used to adjust the pipeline pressure in the extraction system in multiple ways, so as to realize multiple different extraction pressures and meet different extraction requirements, that is, a new pressure changing method is provided, the user experience is improved, and coffee with different tastes can be extracted.

[0085] Embodiment Three

[0086] Embodiment Three of the present application also provides a coffee machine automatic pressure regulating method for the coffee machine pressure regulating device 30 described in Embodiment One or the coffee machine extraction system described in Embodiment Two, thus having 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 described again.

[0087] In this embodiment, preferably, as shown in FIGS. 1 to 5, the coffee machine automatic pressure regulating method comprises the following steps:

[0088] When the extraction is started and the user's pressure changing instruction is obtained, the coffee machine performs the active pressure changing 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 the preset direction to perform the pressure relief operation; at the same time, the driving device 1 drives the encoder 5 gear 4 to rotate synchronously 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 the next pressure changing instruction appears, the driving device 1 is driven again, and the above steps are repeated to adjust the pressure.

[0089] As can be known from the above description, the method is an active pressure changing method, that is, the user initially sets the pressure value according to the user's own needs, and then adjusts the pressure using the coffee machine pressure regulating device 30 according to the set pressure value, so as to finally achieve the extraction pressure required by the user. It can be seen that the pipeline pressure can be effectively controlled according to the above method steps, multiple different extraction pressures can be adjusted, different extraction requirements can be met, that is, a new pressure changing method is provided, the user experience is improved, and coffee with different tastes can be extracted.

[0090] It should be noted that the pump 20, the boiler 40, the valve such as the electromagnetic valve, the encoder 5, the driving device 1 and the like are respectively connected with the controller 80, and cooperate with the above method to realize automatic control, and the controller 80 can be designed separately, and can be integrated with the total controller 80 of the coffee machine, and the specific design is according to actual needs, and in addition, the controller 80 is provided with an operation panel 801.

[0091] Further, preferably, for the step of the user issuing a pressure change instruction, specifically, the user first sets the extraction pressure, the controller 80 learns the value of the encoder 5 corresponding to the extraction pressure, that is, the preset value, and then controls the driving device 1 to start working, and finally makes the encoder 5 reach the preset value from the initial value, so as to complete the active pressure regulation.

[0092] In this embodiment, preferably, the relationship between the relief pressure and the rotation angle of the encoder 5 is obtained by the following method:

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

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

[0095] According to the deformation amount of the spring 33, the spring 33 pressure F of the spring 33 when relieving pressure is f×G×d 4 / (8×n×D 3 )=[a±R / (360×L)]×G×d 4 / (8×n×D 3 ), wherein a is the pre-pressing amount of the spring 33, mm; b is the compression value of the spring 33, mm; G is the modulus of the material, MPa; d is the diameter of the spring 33 wire, mm; n is the effective number of turns of the spring 33; and D is the mean diameter of the spring 33, mm;

[0096] Since the spring 33 pressure of the spring 33 is equal to the relief pressure, the relationship between the relief pressure and the rotation angle of the encoder 5 is finally obtained, and the pressure regulation is performed according to the relationship.

[0097] Embodiment four

[0098] Referring to FIG. 6, the embodiment two of the application further provides a coffee machine extraction system, which comprises the coffee machine pressure regulating device 30 described in the above embodiment one, and thus 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 described herein.

[0099] In this embodiment, preferably, as shown in Fig. 6, the coffee machine extraction system further comprises a water tank 10, a pump 20, a boiler 40, a valve and an extraction head 70; wherein the water tank 10, the pump 20, the boiler 40, the valve and the extraction head 70 are sequentially communicated; the pipeline, in which the pump 20 and the boiler 40 are communicated, is communicated with the water inlet 311 of the regulating valve of the coffee machine pressure regulating device 30.

[0100] Further, preferably, as shown in Fig. 6, the coffee machine extraction system further comprises a pressure sensor 60, and the pressure sensor 60 is arranged on the pipeline, in which the extraction head 70 and the valve are communicated, for detecting the actual extraction pressure in real time.

[0101] According to the above-described structure, it can be known that the system has active pressure changing function and passive pressure changing function, specifically, the above-mentioned pressure changing process is as follows:

[0102] When the extraction is started and the user's pressure changing instruction is acquired, the coffee machine performs active pressure changing 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 the preset direction to perform pressure relief operation, at the same time, the driving device 1 drives the encoder 5 gear 4 to rotate synchronously 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, the driving device 1 stops working, and the extraction operation continues until it is completed or when the next pressure changing instruction appears, the driving device 1 is driven again, and the above-mentioned steps are repeated to adjust the pressure.

[0103] When the extraction is started and the user's pressure changing instruction is not acquired, the coffee machine performs passive pressure changing 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 the preset direction to perform pressure relief operation, until the pressure value detected by the pressure sensor 60 reaches the preset value, the driving device 1 stops working, and the extraction operation continues until it is completed.

[0104] According to the above, it can be known that the system has complete functions, which can not only realize active pressure changing operation according to the user's demand to make coffee with specific taste meeting the user's demand, but also realize passive pressure changing operation, that is, when no pressure regulating instruction is received and a certain deviation exists between the actual extraction pressure and the ideal extraction pressure, automatic pressure regulating processing can be performed to make the extracted taste optimal.

[0105] Embodiment five

[0106] The fifth embodiment of the present application also provides an automatic pressure regulating method for the coffee machine extraction system of the fourth embodiment, thus having all the beneficial technical effects of the coffee machine extraction system, and the same technical features and beneficial effects will not be described again.

[0107] In this embodiment, preferably, as shown in Figs. 1-4 and 6, the automatic pressure regulating method for the coffee machine comprises the following steps:

[0108] When the extraction is started and the user's pressure change instruction is obtained, the coffee machine performs the 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 in a preset direction to perform the pressure relief operation. At the same time, the driving device 1 drives the encoder 5 gear 4 to rotate synchronously 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 the next pressure change instruction is obtained, the driving device 1 is driven again, and the above steps are repeated to adjust the pressure.

[0109] When the extraction is started and the user's pressure change instruction is obtained, the coffee machine performs the 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 in a preset direction to perform the pressure relief operation. At the same time, the driving device 1 drives the encoder 5 gear 4 to rotate synchronously 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 the next pressure change instruction is obtained, the driving device 1 is driven again, and the above steps are repeated to adjust the pressure.

[0110] According to the above description, two pressure regulating modes are provided, i.e. the active pressure regulating mode and the passive pressure regulating mode. The active pressure regulating mode can realize the active pressure change operation according to the user's demand to make coffee with a specific taste that meets the user's demand. The passive pressure regulating mode can automatically perform the pressure regulating process when no pressure regulating instruction is received and a certain deviation exists between the actual extraction pressure and the ideal extraction pressure, so that the taste of the extracted coffee reaches the best.

[0111] In this embodiment, preferably, for the coffee machine performing the active pressure change operation, the relationship between the pressure relief pressure and the rotation angle of the encoder 5 is obtained by the following method:

[0112] According to the rotation angle R of the encoder 5, the moving distance b of the piston 34 is R / (360*L), wherein L is the thread pitch of the piston rod 35.

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

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

[0115] Since the spring 33 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 pressure adjustment is performed according to the relationship.

[0116] It should be noted that the coffee machine pressure regulating device 30 described above further comprises a controller 80, and the controller 80 is in communication connection with the pump 20, the boiler 40, the valve, the pressure sensor 60, the encoder 5, the driving device 1, etc. respectively, and cooperates with the above method to realize automatic control, and the controller 80 can be designed separately, and can also be integrated with the general controller 80 of the coffee machine, and the specific design is according to the actual needs.

[0117] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part 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. Industrial applicability

[0118] The coffee machine pressure regulating device provided by the present application can effectively control the pipeline pressure, realize the adjustment of multiple different extraction pressures, meet different extraction requirements, that is, a new type of pressure varying method is provided, the user's use experience is improved, and coffee with different tastes can be extracted.

Claims

1. A coffee machine pressure regulating device, characterized in that, The drive device is connected with 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 rotating part of the encoder is fixedly connected with the central shaft of the encoder gear. The gear transmission assembly comprises a first transmission gear and a second transmission gear; the first transmission gear is connected with the driving end of the drive device, the second transmission gear is fixedly connected with 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 engaged with the first transmission gear and the encoder gear respectively. The second transmission gear is formed with a central shaft hole, and the piston rod is inserted into the central shaft hole.

2. 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; the valve seat is formed with an installation cavity with an open end, and a water inlet and a pressure relief opening which are respectively communicated with the installation cavity; 3. A coffee machine pressure regulating device according to claim 2, characterised in that, The piston is movably arranged in the installation cavity; the piston rod is screwedly connected with the piston; the spring and the sealing member are arranged in the installation cavity, and the two ends of the spring are connected with the piston and the sealing member respectively; the sealing member is arranged corresponding to the water inlet, and can shield the water inlet.

4. The coffee machine pressure regulating device of claim 1, wherein, The outer wall of the piston rod is formed with 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; and / or The pressure regulating valve further comprises a sealing ring, and the outer wall of the piston is provided with a groove, and the sealing ring is arranged in the groove.

5. The coffee machine pressure regulating device according to claim 4, characterized in that, The coffee machine pressure regulating device comprises a water tank, a pump, a boiler, a valve, an extraction head and the coffee machine pressure regulating device according to any one of claims 1 to 5; the water tank, the pump, the boiler, the valve and the extraction head are sequentially communicated; the pipeline communicated between the pump and the boiler is communicated with the water inlet of the regulating valve of the coffee machine pressure regulating device. The coffee machine extraction system further comprises a pressure sensor, and the pressure sensor is arranged on the pipeline communicated between the extraction head and the valve; and / or 6. A coffee machine extraction system characterized in that, The valve is an electromagnetic valve.

7. The coffee maker extraction system of claim 6, wherein, The coffee machine automatic pressure regulating method for the coffee machine pressure regulating device or the coffee machine extraction system according to any one of claims 1 to 6 comprises the following steps: ​ 8. A method for automatic pressure regulation of a coffee machine, characterized in that, ​ When the extraction is started and the user's pressure change instruction is obtained, the coffee machine performs active pressure change operation, starts the driving device, the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, and then drives the piston to move in the preset direction to perform pressure relief operation. At the same time, the driving device drives the encoder gear to rotate synchronously through the gear transmission assembly, and then drives the rotating part of the encoder to rotate synchronously until the value of the encoder reaches the preset value, and the driving device stops working. The extraction operation continues until it is completed or the next pressure change instruction appears, the driving device is driven again, and the above steps are repeated to adjust the pressure.

9. The automatic pressure regulation method for a coffee maker according to claim 8, characterized in that, In the state that the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, and then drives the piston to move in the preset direction to perform pressure relief operation, and drives the encoder gear to rotate synchronously, and then drives the rotating part of the encoder to rotate synchronously, according to the rotating angle R of the encoder, the moving distance b of the piston is R / (360*L), wherein L is the thread pitch of the piston rod. According to the moving distance of the piston, the deformation amount f of the spring is a±b=a±R / (360*L), wherein a is the pre-pressing amount of the spring of the pressure regulating valve. According to the deformation of the spring, the spring pressure F=f x G x d of the spring during pressure relief is obtained 4 / (8 x n x D 3 ) = [a ± R / (360 x L)] x G x d 4 / (8 x n x D 3 ), wherein a is the pre-pressing 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; and D is the mean diameter of the spring. Since the spring pressure of the spring is equal to the pressure relief pressure, the relationship between the pressure relief pressure and the rotating angle of the encoder is finally obtained, and the pressure is adjusted according to the relationship.

10. A method for automatic pressure regulation of a coffee machine, characterized in that, The coffee machine automatic pressure regulating method comprises the following steps: When the extraction is started and the user's pressure change instruction is obtained, the coffee machine performs active pressure change operation, starts the driving device, the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, and then drives the piston to move in the preset direction to perform pressure relief operation. At the same time, the driving device drives the encoder gear to rotate synchronously through the gear transmission assembly, and then drives the rotating part of the encoder to rotate synchronously until the value of the encoder reaches the preset value, and the driving device stops working. The extraction operation continues until it is completed or the next pressure change instruction appears, the driving device is driven again, and the above steps are repeated to adjust the pressure; When the extraction is started and the user's pressure change instruction is obtained, the coffee machine performs active pressure change operation, starts the driving device, the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, and then drives the piston to move in the preset direction to perform pressure relief operation. At the same time, the driving device drives the encoder gear to rotate synchronously through the gear transmission assembly, and then drives the rotating part of the encoder to rotate synchronously until the value of the encoder reaches the preset value, and the driving device stops working. The extraction operation continues until it is completed or the next pressure change instruction appears, the driving device is driven again, and the above steps are repeated to adjust the pressure; When the extraction is started and the user's pressure change instruction is obtained, the coffee machine performs active pressure change operation, starts the driving device, the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, and then drives the piston to move in the preset direction to perform pressure relief operation. At the same time, the driving device drives the encoder gear to rotate synchronously through the gear transmission assembly, and then drives the rotating part of the encoder to rotate synchronously until the value of the encoder reaches the preset value, and the driving device stops working. The extraction operation continues until it is completed or the next pressure change instruction appears, the driving device is driven again, and the above steps are repeated to adjust the pressure; 11. The automatic pressure regulation method for a coffee maker according to claim 10, characterized in that, In the state that the driving device drives the piston rod to rotate synchronously through the gear transmission assembly, drives the piston to move along the preset direction to carry out pressure relief operation, and drives the encoder gear to rotate synchronously to drive the rotating part of the encoder to rotate, according to the rotating angle R of the encoder, the moving distance b of the piston is R / (360*L), wherein L is the thread pitch of the piston rod; According to the moving distance of the piston, the deformation amount f of the spring is a±b=a±R / (360*L), wherein a is the pre-pressing amount of the spring of the pressure regulating valve; According to the deformation of the spring, the spring pressure F=f×G×d of the spring when pressure relief is obtained 4 / (8×n×D 3 )=[a±R / (360×L)]×G×d 4 / (8×n×D 3 ), wherein a is the pre-pressing 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; and D is the mean diameter of the spring. Since the spring pressure of the spring is equal to the pressure relief pressure, finally the relationship between the pressure relief pressure and the rotating angle of the encoder is obtained, and pressure regulation is carried out according to the relationship.

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