Coffee machine and control method thereof

Abstract

The invention discloses a coffee machine and a control method thereof, and the coffee machine comprises a brewing cavity which is provided with a liquid outlet; the water pump is used for pumping brewing water into the brewing cavity; the plug can plug the liquid outlet from the outer side of the liquid outlet; the sliding block is arranged on the side, back on to the liquid outlet, of the plug, is spaced from the plug and can slide in the direction facing and back on to the plug; the elastic piece is clamped between the plug and the sliding block; and the driving assembly is used for driving the sliding block to slide so as to change the compression amount of the elastic piece. According to the technical scheme, the technical problem that the brewing pressure of an existing coffee machine cannot be adjusted is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a coffee machine and a control method thereof. Background Art

[0002] When brewing coffee, the brewing pressure has a great influence on the taste of the coffee. For example, brewing espresso requires a greater brewing pressure. When brewing coffee with a greater brewing pressure, the resulting coffee tastes stronger, while brewing coffee with a lower brewing pressure results in a lighter coffee taste.

[0003] However, the existing coffee machine can only maintain a constant brewing pressure when brewing coffee, and the brewing pressure cannot be adjusted, and cannot meet the taste requirements of different consumers. Summary of the invention

[0004] The main purpose of the present invention is to provide a coffee machine and a control method thereof, aiming to solve the technical problem that the existing coffee machine cannot adjust the brewing pressure.

[0005] To achieve the above object, the present invention provides a coffee machine, which comprises:

[0006] A water tank for containing brewing water;

[0007] A brewing chamber, provided with a liquid outlet;

[0008] A water pump connected to the water tank and the brewing chamber, and used to pump the brewing liquid in the water tank into the brewing chamber;

[0009] A heating device, used to heat the brewing water pumped to the brewing chamber;

[0010] A plug capable of opening and closing the liquid outlet;

[0011] an elastic member in a compressed elastic deformation state to apply an elastic force to the plug toward the liquid outlet; and

[0012] A drive assembly is configured to change the compression amount of the elastic member.

[0013] In an illustrative embodiment, a slider is also included;

[0014] The elastic member is sandwiched between the plug and the slider

[0015] The slider is arranged on a side of the plug facing away from the liquid outlet, is spaced apart from the plug, and can slide in a direction toward and away from the plug;

[0016] The driving component changes the compression amount of the elastic member by driving the sliding block to slide.

[0017] In a schematic embodiment, the driving assembly includes a rotating body disposed on a side of the slider facing away from the plug, and the rotating body can rotate about a rotation axis;

[0018] The rotating body is provided with a pushing surface that abuts against the slider, and in a first rotation direction of the rotating body, the distance from the pushing surface to the rotation axis gradually increases.

[0019] In a schematic embodiment, the cross-section of the pushing surface is a planar spiral.

[0020] In a schematic embodiment, the driving assembly further includes a motor, and the motor is drivingly connected to the rotating body for driving the rotating body to rotate.

[0021] In a schematic embodiment, the driving assembly further includes:

[0022] A lever, connected to the rotating body for driving the rotating body to rotate; and

[0023] A braking mechanism, connected to the rotating body for braking the rotating body.

[0024] In a schematic embodiment, the driving assembly includes a linear motor or a hydraulic cylinder.

[0025] In a schematic embodiment, the elastic member is a helical spring, a bellows, an air spring or a rubber spring.

[0026] In a schematic embodiment, the driving assembly further includes:

[0027] A pressure sensor for measuring the pressure in the brewing chamber;

[0028] A controller, electrically connected to the pressure sensor, the water pump and the driving assembly;

[0029] The controller is configured to:

[0030] After receiving a start instruction, obtain a preset brewing pressure;

[0031] Start the water pump to inject brewing water into the brewing chamber;

[0032] Control the driving assembly to drive the slider to slide towards the direction close to the plug until the current pressure in the brewing chamber reaches the preset brewing pressure.

[0033] In a schematic embodiment, the controller is further configured to:

[0034] Before starting the water pump, first control the driving assembly to drive the slider to a position where the elastic member is not compressed.

[0035] In a schematic embodiment, the drive assembly further includes:

[0036] A pressure sensor for measuring the pressure in the brewing chamber;

[0037] A home position detection switch for detecting whether the rotating body is in the initial position;

[0038] A controller electrically connected to the pressure sensor, the water pump, and the motor;

[0039] The controller is configured to:

[0040] After receiving a start instruction, obtain a preset brewing pressure;

[0041] Drive the motor to rotate the rotating body to the initial position;

[0042] Start the water pump to inject brewing water into the brewing chamber;

[0043] Control the drive assembly to drive the slider to slide towards the plug until the current pressure in the brewing chamber reaches the preset brewing pressure.

[0044] Wherein, the initial position is the position of the rotating body when the slider does not apply pressure to the elastic member.

[0045] The present application proposes a control method for a coffee machine, and the control method includes:

[0046] Receive a start instruction and obtain a preset brewing pressure;

[0047] Start the water pump to inject brewing water into the brewing chamber;

[0048] The drive assembly drives the slider to slide towards the plug until the current pressure in the brewing chamber reaches the preset brewing pressure.

[0049] In a schematic embodiment, it further includes: before starting the water pump, the drive assembly drives the slider to a position where the elastic member is not compressed.

[0050] In the present application, the drive assembly can adjust the compression amount of the elastic member to change the magnitude of the elastic force exerted by the elastic member on the plug, thereby adjusting the pressure in the brewing chamber. The greater the compression amount of the elastic member, the greater the elastic force exerted by the elastic member on the plug, and the greater the pressure in the brewing chamber; the smaller the compression amount of the elastic member, the smaller the elastic force exerted by the elastic member on the plug, and the smaller the pressure in the brewing chamber.

[0051] In this way, the user can adjust the compression amount of the elastic member through the drive assembly to adjust the pressure in the brewing chamber to make coffee with different flavors. Description of the Drawings

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0053] Figure 1 It is a schematic structural diagram of a coffee machine in an embodiment of the present application;

[0054] Figure 2 It is a schematic structural diagram of another coffee machine in an embodiment of the present application;

[0055] Figure 3 It is a schematic structural diagram of another coffee machine in an embodiment of the present application.

[0056] Explanation of the reference numerals in the drawings:

[0057] 100, coffee machine; 11, brewing chamber; 111, liquid outlet; 12, water pump; 13, water tank; 14, plug; 15, elastic member; 16, slider; 17, driving assembly; 170, rotating body; 171, turntable; 172, convex portion; 1721, pushing surface; 173, motor; 18, controller; 19, pressure sensor; 20, operation panel; 21, origin detection switch; 22, origin trigger portion; 17a, driving assembly; 170a, linear motor; 171a, housing; 172a, telescopic rod; 17b, driving assembly; 170b, hydraulic cylinder; 171b, cylinder block; 172b, piston rod.

[0058] The realization of the object, functional features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. Specific embodiments

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0060] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If this specific posture changes, the directional indications will also change accordingly.

[0061] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In the present invention, unless otherwise clearly specified and defined, terms such as "connected" and "fixed" shall be understood in a broad sense. For example, "fixed" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0064] As Figure 1 shown, Figure 1 shows the internal structure of a coffee machine 100 in this embodiment. The coffee machine 100 includes a brewing chamber 11, a water pump 12, a plug 14, a slider 16, an elastic member 15, a driving assembly 17, a water tank 13, and a heating device.

[0065] The water tank 13 is used to supply brewing water for making coffee. The brewing water is hot water and can be boiling water. The water tank 13 is provided with a water outlet for outputting the brewing water.

[0066] The water pump 12 is provided with an inlet and an outlet. The inlet of the water pump 12 is connected to the water tank through a pipeline. The water pump 12 can suck the brewing water from the water tank 13, pressurize it, and pump it out from the outlet of the water pump 12. The brewing chamber 11 is connected to the outlet of the water pump 12 through a pipeline.

[0067] The heating device can be arranged inside the water tank 13, or can be arranged on the pipeline between the water pump 12 and the pipeline that can be arranged between the brewing chamber 11 and the water pump 11. The heating device can heat the brewing water. The heating device can be a heating wire or a heating tube.

[0068] The brewing chamber 11 is provided with a liquid outlet 111. The liquid outlet 111 is arranged at one end of the brewing chamber 11 facing away from the water pump 12. The liquid outlet 111 can be set as a circular opening. Coffee powder can be placed into the brewing chamber 11, and the water pump 12 pumps brewing water into the brewing chamber 11 to extract the coffee powder. In this embodiment, the brewing chamber 11 includes a brewing bin and a water inlet pipe. The liquid outlet 111 is arranged on the wall surface of the brewing bin. The coffee powder can be placed in the brewing bin. One end of the water inlet pipe is connected to the outlet of the water pump 12, and the other end is connected to the brewing bin. The water inlet pipe connects the water pump 12 and the brewing bin. The brewing water output from the outlet of the water pump 12 is injected into the brewing bin after flowing through the water inlet pipe to brew the coffee powder in the brewing bin.

[0069] The plug 14 is arranged outside the brewing chamber 11 and is located outside the liquid outlet 111 of the brewing chamber 11. The plug 14 can be configured as a sphere. The shape of the plug 14 is not limited, and the plug 14 can also be wedge-shaped or frustum-shaped. The diameter of the plug 14 is larger than the diameter of the liquid outlet 111. The plug 14 can close the liquid outlet 111 from the outside of the liquid outlet 111, and the plug 14 can also be moved away from the liquid outlet 111 to open the liquid outlet 111.

[0070] The slider 16 is arranged on the side of the plug 14 facing away from the liquid outlet 111. There is a gap between the slider 16 and the plug 14. The slider 16 can slide relative to the brewing chamber 11 in the directions towards and away from the plug 14. The slider 16 can be on a track, and this track is arranged on the side of the plug 14 facing away from the liquid outlet 111 and is relatively fixed to the brewing chamber 11. The extending direction of this track is parallel to the central axis of the liquid outlet 111 of the brewing chamber 11. Thus, it is realized that the slider 16 can only move in the direction away from the plug 14.

[0071] The elastic member 15 is arranged between the plug 14 and the slider 16. One end of the elastic member 15 abuts against the plug 14, and the other end of the elastic member 15 abuts against the slider 16. The elastic member 15 is sandwiched between the plug 14 and the slider 16 and can be compressed elastically under the extrusion of the plug 14 and the slider 16. The elastic member 15 can be a helical spring, a rubber spring, a corrugated pipe or an air spring.

[0072] The driving assembly 17 is arranged on the side of the slider 16 facing away from the plug 14. The driving assembly 17 changes the distance between the plug 14 and the slider 16 by driving the slider 16 to slide, thereby changing the compression amount of the elastic member 15. For example, the driving assembly 17 can push the slider 16 towards the plug 14 to increase the compression amount of the elastic member 15; the driving assembly 17 can also cancel the thrust on the slider 16, and the slider 16 moves in the direction away from the plug 14 under the action of the elastic force of the elastic member 15, thereby reducing the compression amount of the elastic member 15.

[0073] In this embodiment, when the elastic member 15 is compressed and undergoes compressive elastic deformation, the elastic member 15 applies an elastic force towards the liquid outlet 111 of the brewing chamber 11 to the plug 14, so that the plug 14 can block the liquid outlet 111 of the brewing chamber 11. The water pump 12 injects brewing water into the brewing chamber 11, and the brewing water extracts the coffee powder in the brewing chamber 11 and turns into coffee liquid. When the liquid outlet 111 is blocked by the plug 14, the continuously injected brewing water can cause the pressure in the brewing chamber 11 to build up, thereby increasing the pressure in the brewing chamber 11. When the pressure in the brewing chamber 11 reaches the level where it can push the plug 14 away from the liquid outlet 111, that is, when the pressure exerted by the coffee liquid on the plug 14 is slightly greater than the elastic force received by the plug 14, the coffee liquid is output from the liquid outlet 111, and the pressure in the brewing chamber 11 remains unchanged.

[0074] The driving component 17 can adjust the compression amount of the elastic member 15 to change the magnitude of the elastic force exerted by the elastic member 15 on the plug 14, thereby adjusting the pressure in the brewing chamber 11. The greater the compression amount of the elastic member 15, the greater the elastic force exerted by the elastic member 15 on the plug 14, and the greater the pressure in the brewing chamber 11; the smaller the compression amount of the elastic member 15, the smaller the elastic force exerted by the elastic member 15 on the plug 14, and the smaller the pressure in the brewing chamber 11.

[0075] In this way, the user can adjust the compression amount of the elastic member 15 through the driving component 17 to achieve the adjustment of the pressure in the brewing chamber 11, so as to make coffee with different flavors.

[0076] In a schematic embodiment, the driving component 17 includes a rotating body 170. The rotating body 170 is arranged on the side of the slider 16 opposite to the plug 14. The rotating body 170 can rotate around its own rotation axis. This rotation axis is perpendicular to the sliding direction of the slider 16. The rotation axis of the rotating body 170 is relatively fixed with respect to the brewing chamber 11. The rotating body 170 can be rotatably connected to a bearing seat through a rotating shaft, and the bearing seat is relatively fixed with respect to the brewing chamber 11.

[0077] The rotating body 170 includes a turntable 171 and a protrusion 172. The turntable 171 is arranged to be able to rotate only around the rotation axis, and this rotation axis coincides with its central axis. The protrusion 172 extends outward from the edge of the turntable 171. The protrusion 172 can rotate with the turntable 171. One side of the protrusion 172 is provided with a pushing surface 1721. The pushing surface 1721 abuts against the side of the slider 16 opposite to the plug 14. The pushing surface 1721 is configured as an arc surface. The pushing surface 1721 is arranged such that the distance between the pushing surface 1721 and the rotation axis gradually increases in the first rotation direction of the rotating body 170, and the distance between the pushing surface 1721 and the rotation axis gradually decreases in the second rotation direction of the rotating body 170. The first rotation direction of the rotating body 170 is opposite to the second rotation direction.

[0078] In this way, when the rotating body 170 rotates in the second rotation direction, the pushing surface 1721 can squeeze the slider 16 to cause the slider 16 to slide towards the plug 14, thereby increasing the compression amount of the elastic member 15; when the rotating body 170 rotates in the first rotation direction, the pushing surface 1721 can make way for the slider 16, and the slider 16 slides in the direction away from the plug 14 under the action of the elastic force exerted by the elastic member 15, thereby reducing the compression amount of the elastic member 15.

[0079] In a schematic embodiment, the cross-section of the pushing surface 1721 of the rotating body 170 in the direction perpendicular to the rotation axis is a planar spiral. The planar spiral can be an Archimedean spiral.

[0080] In this way, the pushing surface 1721 of the rotating body 170 is configured as a planar spiral, and the relative sliding between the pushing surface 1721 and the slider 16 can be smoother. At the same time, the relationship between the rotation angle of the rotating body 170 and the sliding displacement of the slider 16 can be more linear, and further, the relationship between the rotation angle of the rotating body 170 and the compression amount of the elastic member 15 can be more linear, and the relationship between the rotation angle of the rotating body 170 and the pressure in the brewing chamber 11 can be more linear, which is more convenient to adjust the pressure in the brewing chamber 11 by changing the rotation angle of the rotating body 170.

[0081] In a schematic embodiment, the driving assembly 17 further includes a motor 173. The motor 173 is drivingly connected to the rotating body 170. The motor 173 can drive the rotating body 170 to rotate in the first rotation direction and the second rotation direction.

[0082] It can be that the main shaft of the motor 173 is directly connected to the rotating body 170, and the main shaft of the motor 173 is coaxial with the rotation axis of the rotating body 170, and the main shaft of the motor 173 directly drives the rotating body 170 to rotate. It can also be that the main shaft of the motor 173 is connected to the rotating body 170 through a transmission mechanism, and the transmission mechanism transmits the torque output by the motor 173 to the rotating body 170 to drive the rotating body 170 to rotate. The transmission mechanism can be a gear transmission mechanism, a belt transmission mechanism or a chain transmission mechanism.

[0083] By driving the rotating body 170 to rotate through the motor 173, there is no need to rotate the rotating body 170 manually, and it is also more conducive to realizing mechanical automation.

[0084] In a schematic embodiment, the driving assembly 17 further includes a pressure sensor 19 and a controller 18. The pressure sensor 19 is disposed on the brewing chamber 11 for measuring the pressure in the brewing chamber 11.

[0085] The controller 18 is the logic control unit of the coffee machine 100. The controller 18 can be a single-chip microcomputer. The controller 18 is electrically connected to the pressure sensor 19, the motor 173 and the water pump 12.

[0086] This embodiment also proposes a control method for a coffee machine 100, and the control method includes the following steps:

[0087] Step S1: The controller 18 receives a start instruction, obtains a preset brewing pressure, and enters Step S2;

[0088] The coffee machine 100 further includes an operation panel 20. The operation panel 20 is electrically connected to the controller 18. The preset brewing pressure is a preset value, and the user can set the preset brewing pressure through the operation panel 20. For example, the value range of the preset brewing pressure can be 0-12 bar. After the user sets the preset brewing pressure, the user can send a start instruction to the controller 18 by pressing the start button on the operation panel 20. The start instruction is used to indicate starting to make coffee. After receiving the start instruction, the controller 18 reads the preset brewing pressure preset by the user. When the coffee machine 100 has a function of grinding coffee beans, the coffee machine 100 also grinds the coffee beans into coffee powder and conveys the ground coffee powder to the brewing chamber 11 before starting the water pump 12. It can also be that before starting the water pump 12, the user places the pre-ground coffee powder into the brewing chamber 11.

[0089] Step S2: The controller 18 starts the water pump 12 to inject brewing water into the brewing chamber 11;

[0090] After the controller 18 starts the water pump 12, the water pump 12 injects the brewing water supplied by the water tank 13 into the brewing chamber 11. The controller 18 can control the power of the water pump 12 to maintain the rotation speed of the water pump 12 at a constant rotation speed, so that the water pump 12 can inject the brewing water into the brewing chamber 11 at a uniform speed. In the brewing chamber 11, the brewing water extracts the coffee powder and is converted into coffee liquid. During the pressure increase process, the pressure change in the brewing chamber 11 will also be more linear. The controller 18 can control the power of the water pump 12 by controlling the duty cycle of the driving signal of the water pump 12, or the controller 18 can also control the power of the water pump 12 by controlling the magnitude of the input voltage of the water pump 12.

[0091] Step S3: The controller 18 controls the driving component 17 to drive the slider 16 to slide in the direction close to the plug 14, and measures the current pressure in the brewing chamber 11 in real time. When the current pressure in the brewing chamber 11 reaches the preset brewing pressure, the controller 18 controls the driving component 17 to stop driving the slider 16 from sliding.

[0092] The controller 18 drives the slider 16 to slide towards the plug 14 through controlling the driving assembly 17, so as to gradually increase the compression amount of the elastic member 15. During the process of the increase in the compression amount of the elastic member 15, the elastic force exerted by the elastic member 15 on the plug 14 gradually increases, and the resistance exerted by the plug 14 on the coffee liquid output from the liquid outlet 111 gradually increases, and the pressure in the brewing chamber 11 starts to rise. At the same time, the controller 18 also monitors the current pressure in the brewing chamber 11 in real time through the pressure sensor 19, and compares the current pressure in the brewing chamber 11 with the preset brewing pressure. When the pressure in the brewing chamber 11 is greater than or equal to the preset brewing pressure, the controller 18 controls the driving assembly 17 to stop driving the slider 16 to slide, so that the slider 16 is stationary. At this time, the current pressure in the brewing chamber 11 is equal to the preset brewing pressure set by the user, and the brewing water can extract the coffee powder at the preset brewing pressure and be converted into coffee liquid, and the coffee liquid continuously outputs outward from the liquid outlet 111.

[0093] In a schematic embodiment, in step S2, before the controller 18 starts the water pump 12, it first controls the driving assembly 17 to drive the slider 16 to a position where the elastic member 15 is not compressed.

[0094] The controller 18 first drives the slider 16 to a position where the elastic member 15 is not compressed through the driving assembly 17, so that the compression amount of the elastic member 15 is zero, and the elastic member 15 does not exert an elastic force on the plug 14. At this time, the water pump 12 can smoothly inject the brewing water into the brewing chamber 11, and the coffee liquid in the brewing chamber 11 can also freely flow out of the brewing chamber 11.

[0095] In the subsequent step S3, when the controller 18 controls the driving assembly 17 to drive the slider 16 to slide towards the direction close to the plug 14, the compression amount of the elastic member 15 starts to increase from zero until the pressure in the brewing chamber 11 is equal to the preset brewing pressure and then stops. During this process, the liquid outlet 111 of the brewing chamber 11 continuously outputs coffee liquid and will not be completely blocked by the plug 14, so there will be no pressure fluctuation generated when the plug 14 is instantly washed open by the coffee liquid, and the pressure in the brewing chamber 11 can rise smoothly.

[0096] In a schematic embodiment, the coffee machine 100 further includes an origin detection switch 21. The origin detection switch 21 is electrically connected to the controller 18. The origin detection switch 21 is used to detect whether the rotating body 170 is in the initial position. The initial position of the rotating body 170 is the position where the rotating body 170 is located when the slider 16 does not exert pressure on the elastic member 15. This initial position can be the position where the slider 16 is in contact with the elastic member 15, but there is no mutual acting force between the slider 16 and the elastic member 15.

[0097] The origin detection switch 21 can be a micro switch, an optoelectronic switch or a Hall switch. An origin trigger part 22 is also provided on the rotating body 170. The origin detection switch 21 is configured to be triggered by the origin trigger part 22 only when the rotating body 170 is in the initial position. The origin trigger part 22 can be a protrusion protruding from the surface of the rotating body 170, a reflective member or a magnet. The protrusion, the reflective member and the magnet can trigger the micro switch, the optoelectronic switch and the Hall switch respectively.

[0098] In this way, the controller 18 can determine whether the rotating body 170 has reached the initial position according to whether the origin detection switch 21 has been triggered.

[0099] Before the controller 18 starts the water pump 12, the drive motor 173 rotates the rotating body 170 to the initial position so that the elastic member 15 is not compressed.

[0100] After receiving the start instruction, the controller 18 rotates the rotating body 170 by rotating the drive motor 173 forward or backward. When the rotating body 170 rotates to trigger the origin detection switch 21, the controller 18 stops the drive motor 173 from rotating. At this time, the rotating body 170 is in the initial position.

[0101] In another exemplary embodiment, the drive assembly 17 further includes a lever and a braking mechanism. One end of the lever is connected to the rotating body 170, and the other end of the lever extends away from the rotation axis of the rotating body 170. The user can drive the rotation of the rotating body 170 by rotating the lever.

[0102] The braking mechanism is connected to the rotating body 170. The braking mechanism can brake the rotating body 170. The braking mechanism is configured to brake the rotating body 170 to keep the rotating body 170 stationary when the user stops rotating the rotating body 170 by driving the lever. The braking mechanism can be a ratchet mechanism or a brake.

[0103] In this way, the user can manually operate the lever to rotate the rotating body 170, thereby adjusting the compression amount of the elastic member 15 and the pressure in the brewing chamber 11.

[0104] The corresponding relationship between the position of the lever and the pressure in the brewing chamber 11 can also be pre-calibrated, and a scale is set for the lever according to this corresponding relationship. For example, multiple gears of the pressure in the brewing chamber 11 are set, and the position that the lever needs to reach when the pressure in the brewing chamber 11 reaches each gear is marked on the scale. The user can rotate the lever to the position of the lever corresponding to the required pressure gear according to the indication on the scale, so that the pressure in the brewing chamber 11 can reach the required brewing pressure.

[0105] In another exemplary embodiment, as Figure 2As shown, the driving assembly 17a includes a linear motor 170a. The linear motor 170a includes a housing 171a and a telescopic rod 172a. The telescopic rod 172a can be retracted into and extended from the housing 171a. The linear motor 170a is disposed on the side of the slider 16 facing away from the plug 14. The housing 171a of the linear motor 170a is relatively fixed to the brewing chamber 11. The telescopic rod 172a of the linear motor 170a is connected to the slider 16, and the extending direction of the telescopic rod 172a of the linear motor 170a is parallel to the sliding direction of the slider 16.

[0106] When the linear motor 170a extends the telescopic rod 172a, the slider 16 is pushed by the telescopic rod 172a towards the plug 14, the compression amount of the elastic member 15 increases, and the pressure in the brewing chamber 11 increases. When the linear motor 170a retracts the telescopic rod 172a, the slider 16 slides in the direction away from the plug 14 under the elastic force of the elastic member 15, the compression amount of the elastic member 15 decreases, and the pressure in the brewing chamber 11 decreases.

[0107] In another exemplary embodiment, as Figure 3 shown, the driving assembly 17b includes a hydraulic cylinder 170b. The hydraulic cylinder 170b includes a cylinder block 171b and a piston rod 172b. The piston rod 172b can be retracted into and extended from the cylinder block 171b. The hydraulic cylinder 170b is disposed on the side of the slider 16 facing away from the plug 14. The cylinder block 171b of the hydraulic cylinder 170b is relatively fixed to the brewing chamber 11. The piston cylinder of the hydraulic cylinder 170b is connected to the slider 16, and the extending direction of the piston rod 172b of the hydraulic cylinder 170b is parallel to the sliding direction of the slider 16.

[0108] When the hydraulic cylinder 170b extends the piston rod 172b, the slider 16 is pushed by the piston rod 172b towards the plug 14, the compression amount of the elastic member 15 increases, and the pressure in the brewing chamber 11 increases. When the hydraulic cylinder 170b retracts the piston rod 172b, the slider 16 slides in the direction away from the plug 14 under the elastic force of the elastic member 15, the compression amount of the elastic member 15 decreases, and the pressure in the brewing chamber 11 decreases.

[0109] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A coffee machine, It is characterized in that include: A water tank for containing brewing water; A brewing chamber, provided with a liquid outlet; A water pump connected to the water tank and the brewing chamber, and used to pump the brewing liquid in the water tank into the brewing chamber; A heating device, used to heat the brewing water pumped to the brewing chamber; A plug capable of opening and closing the liquid outlet; an elastic member in a compressed elastic deformation state to apply an elastic force to the plug toward the liquid outlet; as well as A drive assembly is configured to change the compression amount of the elastic member.

2. The coffee machine according to claim 1, It is characterized in that Also includes sliders; The elastic member is sandwiched between the plug and the slider The slider is arranged on a side of the plug facing away from the liquid outlet, is spaced apart from the plug, and can slide in a direction toward and away from the plug; The driving component changes the compression amount of the elastic member by driving the sliding block to slide.

3. The coffee machine according to claim 2, It is characterized in that The driving assembly comprises a rotating body arranged on the side of the slider facing away from the plug, and the rotating body can rotate around a rotation axis; The rotating body is provided with a pushing surface which abuts against the sliding block, and in the first rotation direction of the rotating body, the distance from the pushing surface to the rotation axis gradually increases.

4. The coffee machine according to claim 3, It is characterized in that The cross section of the pushing surface is a plane spiral.

5. The coffee machine according to claim 3, It is characterized in that The driving assembly also includes a motor, which is transmission-connected to the rotating body and is used to drive the rotating body to rotate.

6. The coffee machine according to claim 3, It is characterized in that The drive assembly also includes: A lever connected to the rotating body and used to drive the rotating body to rotate; and The braking mechanism is connected to the rotating body and is used for braking the rotating body.

7. The coffee machine according to claim 2, It is characterized in that The driving assembly includes a linear motor or a hydraulic cylinder.

8. The coffee machine according to claim 2, It is characterized in that The elastic member is a coil spring, a bellows, an air spring or a rubber spring.

9. The coffee machine according to any one of claims 2 to 5, 7 and 8, It is characterized in that The drive assembly also includes: A pressure sensor, used to measure the pressure in the brewing chamber; A controller, electrically connected to the pressure sensor, the water pump and the driving assembly; The controller is configured as follows: After receiving the start command, obtaining a preset brewing pressure; Start the water pump to inject brewing water into the brewing chamber; The control driving assembly drives the sliding block to slide towards the plug until the current pressure in the brewing chamber reaches the preset brewing pressure.

10. The coffee machine according to claim 9, It is characterized in that The controller is also configured to: Before starting the water pump, the driving assembly is controlled to drive the slider to a position where the elastic member is not compressed.

11. The coffee machine according to claim 5, It is characterized in that The drive assembly also includes: A pressure sensor, used to measure the pressure in the brewing chamber; Origin detection switch, used to detect whether the rotating body is in the initial position; A controller, electrically connected to the pressure sensor, the water pump, and the motor; The controller is configured to: After receiving a start instruction, obtain a preset brewing pressure; Drive the motor to rotate the rotating body to the initial position; Start the water pump to inject brewing water into the brewing chamber; Control the drive assembly to drive the slider to slide in a direction close to the plug until the current pressure in the brewing chamber reaches the preset brewing pressure; Wherein, the initial position is the position where the rotating body is located when the slider does not apply pressure to the elastic member.

12. A control method for a coffee machine, Characterized in that, Implemented based on the coffee machine according to any one of claims 2 to 11, the control method includes: Receive a start instruction and obtain a preset brewing pressure; Start the water pump to inject brewing water into the brewing chamber; The drive assembly drives the slider to slide in a direction close to the plug until the current pressure in the brewing chamber reaches the preset brewing pressure.

13. According to the control method of claim 12, Characterized in that, It further includes: Before starting the water pump, the drive assembly drives the slider to a position where the elastic member is not compressed.

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