Brewing device and beverage dispenser

Abstract

The utility model discloses a brewing device and a beverage dispenser. The brewing device comprises a support assembly and a brewing assembly, the brewing cylinder is arranged on the support assembly, a brewing chamber can be formed by the brewing cylinder, and the brewing chamber comprises a filling opening; an upper piston selectively engaged with the brewing cylinder from above the filling opening to close the brewing chamber; the lower piston is movably jointed with the brewing cylinder; the pressure relief valve selectively controls the brewing chamber to be communicated with the pressure relief opening; the liquid outlet pipeline is provided with a liquid outlet communicated with the brewing chamber; the backflow pipeline is provided with a backflow opening communicated with the brewing chamber, and the backflow pipeline is communicated with the liquid outlet pipeline on the outer side of the brewing chamber; the backflow port is provided with a first one-way valve, and the first one-way valve allows one-way communication from the backflow pipeline to the brewing chamber; the liquid outlet is provided with a second one-way valve, and the second one-way valve allows one-way communication from the brewing chamber to the liquid outlet pipeline; the lower piston is connected with a liquid inlet pipeline, and the brewing device can selectively discharge liquid returning to the brewing chamber from the backflow pipeline through the pressure relief opening. And through simple structural design, the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of beverage preparation, and particularly relates to a brewing device and a beverage machine. Background Art

[0002] In the existing technical field of beverage machines, automatic brewing devices are widely used in households and commercial places. The automatic brewing device can, through program control, realize a series of processes from grinding beverage raw materials, heating water to brewing beverage particles, enabling users to conveniently and quickly enjoy high-quality beverages. These brewing devices generally include a brewing cylinder, an upper piston and a lower piston, which are used to form and adjust the volume of the brewing chamber, so as to realize the extraction of beverage particles. However, there are some problems in the use of the existing brewing devices. Especially after brewing is completed, it is difficult to completely empty the beverage liquid remaining in the brewing device and the pipeline, which affects the taste of the subsequent beverage and the sanitation condition of the brewing device.

[0003] In view of the deficiencies of the prior art, there are also some improvement solutions in the market. For example, some brewing devices extract the remaining beverage liquid in the pipeline by adding an emptying pump, or reduce the remaining liquid by designing a special structure. These solutions solve some problems to a certain extent, but also bring some new challenges and defects. For example, adding an emptying pump not only increases the equipment cost, but also increases the complexity and maintenance difficulty of the device. In addition, among these improvement solutions, many still cannot completely remove the remaining beverage liquid in the brewing device and the pipeline. Especially after long-term use, the remaining beverage is likely to cause bacteria to breed inside the device, affecting the sanitation and taste of the beverage. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a brewing device with reliable use and low cost.

[0005] Another purpose of the utility model is to provide a beverage machine with reliable use and low cost.

[0006] To achieve one of the above-mentioned purposes of the utility model, the utility model provides a brewing device, including:

[0007] A bracket assembly;

[0008] A brewing cylinder, arranged on the bracket assembly, the brewing cylinder can form a brewing chamber for filling beverage particles, and the brewing chamber includes a filling opening for filling the beverage particles;

[0009] An upper piston, which can optionally engage with the brewing cylinder above the filling opening to close the brewing chamber;

[0010] A lower piston, engaged with the brewing cylinder, and the lower piston can move relative to the brewing cylinder to change the volume of the brewing chamber;

[0011] A pressure relief valve that selectively controls the communication between the brewing chamber and the pressure relief port;

[0012] The liquid outlet pipe has a liquid outlet communicating with the brewing chamber; the return pipe has a return port communicating with the brewing chamber, and the return pipe communicates with the liquid outlet pipe outside the brewing chamber; a first one-way valve is provided at the return port, and the first one-way valve allows one-way communication from the return pipe to the brewing chamber; a second one-way valve is provided at the liquid outlet, and the second one-way valve allows one-way communication from the brewing chamber to the liquid outlet pipe;

[0013] The lower piston is connected with a liquid inlet pipe, and the brewing device can selectively discharge the liquid returned from the return pipe to the brewing chamber through the pressure relief port.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: By providing the liquid outlet pipe and the return pipe to communicate, after the brewed beverage liquid is output from the liquid outlet pipe or when the brewing cylinder is cleaned, the first one-way valve can be opened so that the residual beverage liquid in the liquid outlet pipe and the pipeline downstream of the liquid outlet pipe returns to the brewing chamber from the return pipe, and then is discharged from the pressure relief valve. Through a simple structural design, high-cost and high-complexity solutions such as using a drainage device are avoided, reducing the equipment cost and maintenance difficulty. In addition, through an optimized structural design, an efficient cleaning function is achieved, the consumption of water resources can be reduced during the cleaning process, the use cost and environmental burden are reduced, and at the same time, the quality and taste of coffee brewed each time are ensured.

[0015] As a further improvement of an embodiment of the present utility model, the return pipe includes a first pipe connected to the upper piston, the first pipe has a lumen, the first one-way valve is arranged in the lumen, and the first one-way valve includes a first valve ball and an elastic member acting on the first valve ball.

[0016] As a further improvement of an embodiment of the present utility model, a baffle is provided at the return port, the baffle is connected to the first pipe, the return port is formed between the baffle and the wall of the lumen, and a mounting post extending from the baffle is arranged in the lumen, and the elastic member is sleeved on the mounting post.

[0017] As a further improvement of an embodiment of the present utility model, the return pipe further includes a second pipe, the second pipe is connected between the liquid outlet pipe and the first pipe, a first sealing member is connected between the second pipe and the first pipe, a part of the second pipe extends into the first pipe, and the first sealing member is located between the wall of the lumen and the second pipe.

[0018] As a further improvement of an embodiment of the present utility model, the second pipeline includes an insertion section extending into the first pipeline. An annular wall is provided on the periphery of the insertion section. A gap between the insertion section and the annular wall forms an annular groove, and the first pipeline extends into the annular groove.

[0019] As a further improvement of an embodiment of the present utility model, a connecting pipe is provided on the liquid outlet pipeline, and a part of the connecting pipe extends into the reflux pipeline; an annular step portion is provided on the outside of the connecting pipe, and a first inner step and a second inner step are provided inside the reflux pipeline. The first inner step and the second inner step are formed by sequentially increasing the inner diameter of the pipe. A second sealing member is provided between the reflux pipeline and the connecting pipe. The connecting pipe abuts against the first inner step, and the second sealing member is defined between the annular step portion and the second inner step.

[0020] As a further improvement of an embodiment of the present utility model, the upper piston includes a piston cylinder. The liquid outlet pipeline and the reflux pipeline are arranged inside the piston cylinder. A first clamping block is provided on one of the end of the liquid outlet pipeline far from the liquid outlet and the piston cylinder, and a first clamping groove is provided on the other. The first clamping block is inserted into the first clamping groove.

[0021] As a further improvement of an embodiment of the present utility model, it further includes a pipe joint connected to the liquid outlet pipeline. Along the circumferential direction of the liquid outlet pipeline, a limiting groove is provided on one of the pipe joint and the inner wall of the piston cylinder, and a limiting portion is provided on the other. The limiting groove and the limiting portion cooperate to limit the relative rotation of the pipe joint and the piston cylinder; a second clamping block is provided on one of the pipe joint and the piston cylinder, and a second clamping groove is provided on the other. The second clamping block is inserted into the second clamping groove.

[0022] As a further improvement of an embodiment of the present utility model, the liquid inlet pipeline includes a first section of liquid inlet pipe and a second section of liquid inlet pipe. The pressure relief valve is connected between the first section of liquid inlet pipe and the second section of liquid inlet pipe. The first section of liquid inlet pipe is connected to the bracket assembly, and the second section of liquid inlet pipe is connected between the lower piston and the pressure relief valve. The horizontal position of the first section of liquid inlet pipe is higher than the horizontal position of the pressure relief valve.

[0023] The present utility model further provides a beverage machine, including the brewing device according to any one of the above embodiments. The beverage machine further includes a grinding device and a beverage outlet. The grinding device is used to convey the beverage particles to the brewing chamber, and the downstream of the liquid outlet pipeline is connected to the beverage outlet. Description of the Drawings

[0024] Figure 1 is a schematic diagram of the brewing device of an embodiment of the present utility model.

[0025] Figure 2 is Figure 1 a perspective view of the upper piston part of the brewing device in

[0026] Figure 3 is a sectional view along the Figure 2 A-A line in

[0027] Figure 4 is a sectional view along the Figure 3 B-B line in

[0028] Figure 5 is a sectional view along the Figure 1 C-C line in

[0029] Figure 6 is Figure 1 a schematic view of the brewing chamber of the brewing device in

[0030] Figure 7 is Figure 1 a schematic view of the brewing chamber of the brewing device in a closed state

[0031] Figure 8 is Figure 1 a schematic view of the brewing device in the state of ejecting coffee grounds

[0032] Figure 9 is Figure 1 a schematic view of another structural form of the upper piston part in

[0033] Figure 10 a schematic view of a beverage machine according to an embodiment of the present invention Detailed Embodiments

[0034] The present invention will be described in detail below with reference to the specific embodiments shown in the drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional transformation made by those of ordinary skill in the art based on these embodiments is included in the protection scope of the present invention.

[0035] It should be understood that the spatially relative terms, such as "upper", "above", "lower", "below", etc., used herein are for the purpose of facilitating description to describe the relationship of one element or feature to another element or feature as shown in the drawings. The spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation shown in the figures.

[0036] The brewing device in the specific embodiment of the present invention is described by taking a brewing device capable of brewing coffee granules as an example. Refer to Figures 1 to 4As shown, in this embodiment, the brewing device 100 includes a bracket assembly 20 and a brewing cylinder 30 disposed on the bracket assembly 20. The brewing cylinder 30 can form a brewing chamber 31 for filling beverage particles. The brewing chamber 31 includes a filling opening 311 for filling beverage particles, and the beverage particles can be filled into the brewing chamber 31 from the filling opening 311.

[0037] The brewing device 100 further includes an upper piston 40, a lower piston 50, and a pressure relief valve 53. The upper piston 40 is selectively engaged with the brewing cylinder 30 above the filling opening 311 to close the brewing chamber 31. The lower piston 50 is engaged with the brewing cylinder 30 and can move relative to the brewing cylinder 30 to change the volume of the brewing chamber 31. The lower piston 50 and the brewing cylinder 30 move relative to each other in a first direction to change the volume of the brewing chamber 31. The first direction is, for example, Figure 1 the direction of the arrow M as shown. In this embodiment, the brewing cylinder 30 is placed obliquely, and the brewing cylinder 30 is configured as a cylinder. The first direction can be considered as the axial direction of the brewing cylinder 30. In other feasible solutions, the brewing cylinder 30 can also be placed vertically, then the axial direction of the brewing cylinder 30 is perpendicular to the horizontal direction. The pressure relief valve 53 selectively controls the communication between the brewing chamber 31 and the pressure relief port 531 to discharge the liquid in the brewing chamber 31 through the pressure relief port 531.

[0038] In this embodiment, the bracket assembly 20 is provided with a driving mechanism. The driving mechanism can be a mechanism that transmits the movement of the power source to the upper piston 40 and the lower piston 50, so that the upper piston 40 or the lower piston 50 moves linearly relative to the brewing cylinder 30.

[0039] Among them, the upper piston 40 is connected with a liquid outlet pipe 41 and a return pipe 43. The liquid outlet pipe 41 has a liquid outlet 411 communicating with the brewing chamber 31. The return pipe 43 has a return port 420 communicating with the brewing chamber 31. The return pipe 43 communicates with the liquid outlet pipe 41 outside the brewing chamber 31. A first one-way valve 45 is provided at the return port 420, and the first one-way valve 45 allows one-way communication from the return pipe 43 to the brewing chamber 31. A second one-way valve 47 is provided at the liquid outlet 411, and the second one-way valve 47 allows one-way communication from the brewing chamber 31 to the liquid outlet pipe 41. The lower piston 50 is connected with a liquid inlet pipe 51. The brewing device 100 can selectively discharge the liquid returned from the return pipe 43 to the brewing chamber 31 through the pressure relief port 531.

[0040] Specifically, the pressure relief valve 53 can be disposed on the liquid inlet pipe 51. Through the liquid inlet pipe 51, liquid can be supplied to the brewing chamber 31 and the liquid in the brewing chamber 31 can also be discharged, so as to simplify the pipeline arrangement.

[0041] The liquid outlet pipe 41 is communicated with the reflux pipe 43. After the brewed beverage liquid is output from the liquid outlet pipe 41, the first one-way valve 45 can be opened so that the residual beverage liquid in the liquid outlet pipe 41 and the pipeline downstream of the liquid outlet pipe 41 returns to the brewing chamber 31 through the reflux pipe 43, and then is discharged from the pressure relief port 531. When cleaning the brewing cylinder 30, the residual beverage liquid in the liquid outlet pipe 41 and the pipeline downstream of the liquid outlet pipe 41 can also be returned to the brewing chamber 31 through the reflux pipe 43, and then is discharged from the pressure relief port 531. The design of the reflux pipe 43 enables the residual beverage liquid in the brewing cylinder 30 and the pipeline to be refluxed and discharged through the negative pressure effect after brewing, improving the automation degree and cleaning effect of the device. Through a simple structural design, high-cost and high-complexity solutions such as using an evacuation device are avoided, reducing the equipment cost and maintenance difficulty. In addition, through an optimized structural design, an efficient cleaning function is achieved, reducing the consumption of water resources during the cleaning process, reducing the use cost and environmental burden, and ensuring the quality and taste of the beverage brewed each time.

[0042] Further, the reflux pipe 43 includes a first pipe 431 connected to the upper piston 40. The first pipe 431 has a lumen 430. The first one-way valve 45 is arranged in the lumen 430. The first one-way valve 45 includes a first valve ball 451 and a first elastic member 453 acting on the first valve ball 451. The first valve ball 451 is used to open or close the reflux port 420. The first elastic member 453 is used to press against the first valve ball 451 to close the reflux port 420. A baffle 433 is arranged at the reflux port 420. The baffle 433 is connected to the first pipe 431. The reflux port 420 is formed between the baffle 433 and the wall of the lumen 430. An installation post 435 extending from the baffle 433 is arranged in the lumen 430. The first elastic member 453 is sleeved on the installation post 435. When the upper piston 40 moves away from the lower piston 50 relative to the brewing cylinder 30, a negative pressure environment is formed in the brewing chamber 31, and the first valve ball 451 can overcome the acting force of the first elastic member 453 to open the reflux port 420. By sleeving the first elastic member 453 on the installation post 435 of the baffle 433, a reliable support can be provided for the first elastic member 453, and the movement range of the first valve ball 451 can also be limited, ensuring the more reliable opening and closing of the first one-way valve 45.

[0043] The second one-way valve 47 includes a second valve ball 471 and a second elastic member 473 acting on the second valve ball 471. The second valve ball 471 is used to open or close the liquid outlet 411, and the second elastic member 473 is used to press against the second valve ball 471 to close the liquid outlet 411. The elastic force of the second elastic member 473 acts in the opposite direction to the elastic force of the first elastic member 453 to ensure that the second one-way valve 47 is in a state of closing the liquid outlet 411 when the first one-way valve 45 opens the return port 420. When the upper piston 40 moves relative to the brewing cylinder 30 towards the lower piston 50, pressure is generated in the brewing chamber 31, and the second valve ball 471 can overcome the acting force of the first elastic member 453 to open the liquid outlet 411. The beverage liquid can be discharged from the liquid outlet pipe 41 and the downstream pipeline to the beverage outlet 12.

[0044] Wherein, both the first valve ball 451 and the second valve ball 471 are constructed as glass balls, and both the first elastic member 453 and the second elastic member 473 are constructed as compression springs, which have low cost and reliable use. A filter screen 48 is provided at one end of the upper piston 40 facing the brewing chamber 31 to limit the discharge of beverage particles from the liquid outlet pipe 41 when brewing the beverage.

[0045] Continue to refer to Figure 3 , the return pipeline 43 further includes a second pipeline 432. The second pipeline 432 is connected between the liquid outlet pipe 41 and the first pipeline 431. A first seal 434 is connected between the second pipeline 432 and the first pipeline 431. A part of the second pipeline 432 extends into the first pipeline 431, and the first seal 434 is located between the wall of the lumen 430 and the second pipeline 432. The return pipeline 43 is arranged such that two pipelines are hermetically connected, which is convenient for manufacturing and assembly.

[0046] Wherein, a flange 436 is provided on the outer side of the second pipeline 432. A part of the second pipeline 432 extends into the first pipeline 431, and the flange 436 abuts against the end of the first pipeline 431 to position the connection between the first pipeline 431 and the second pipeline 432.

[0047] The second pipeline 432 includes an insertion section 437 extending into the first pipeline 431. An annular wall 438 is provided around the periphery of the insertion section 437. The interval between the insertion section 437 and the annular wall 438 forms an annular groove 439, and the first pipeline 431 extends into the annular groove 439. The annular wall 438 can be provided on the flange 436 to make the connection between the two pipelines more reliable. The second pipeline 432 and the liquid outlet pipe 41 can be welded together by ultrasonic welding, and the structure is simple.

[0048] In addition, the upper piston 40 includes a piston cylinder 42. The liquid outlet pipe 41 and the return pipe 43 are arranged inside the piston cylinder 42. One of the end of the liquid outlet pipe 41 far from the liquid outlet 411 and the piston cylinder 42 is provided with a first clamping block 413, and the other is provided with a first clamping groove 423. The first clamping block 413 is inserted into the first clamping groove 423. The acting force directions of the first elastic member 453 and the second elastic member 473 are along the extending directions of the first pipe 431 and the liquid outlet pipe 41. By limiting the first clamping block 413 through the first clamping groove 423, it is possible to prevent leakage caused by the displacement of the first pipe 431 and the second pipe 432. Among them, the first clamping groove 423 can be arranged on the inner wall of the piston cylinder 42, and the first clamping block 413 can be arranged on the liquid outlet pipe 41, which is convenient for manufacturing and assembly.

[0049] Furthermore, the brewing device 100 further includes a pipe joint 46 connected to the liquid outlet pipe 41. Along the circumferential direction of the liquid outlet pipe 41, one of the pipe joint 46 and the inner wall of the piston cylinder 42 is provided with a limiting groove 461, and the other is provided with a limiting portion 421. The limiting groove 461 and the limiting portion 421 cooperate to limit the relative rotation of the pipe joint 46 and the piston cylinder 42. Among them, the limiting groove 461 can be formed by the gap between two clamping claws arranged at intervals on the pipe joint 46, and the limiting portion 421 can be two convex ribs on the inner wall of the piston cylinder 42. The two convex ribs can extend along the axial direction of the piston cylinder 42, and the two convex ribs extend into the space between the two clamping claws, which is convenient for the pipe joint 46 to be connected to the liquid outlet pipe 41 from top to bottom. One of the pipe joint 46 and the piston cylinder 42 is provided with a second clamping block 462, and the other is provided with a second clamping groove 422. The second clamping block 462 is inserted into the second clamping groove 422, which can axially limit the pipe joint 46. Among them, the second clamping groove 422 can be arranged on the inner wall of the piston cylinder 42, and the second clamping block 462 can be arranged on the pipe joint 46, which is convenient for manufacturing and assembly. Limiting the pipe joint 46 axially and circumferentially along the liquid outlet pipe 41 can ensure the position of the pipe joint 46 in the piston cylinder 42 is fixed and will not change due to the movement of the piston cylinder 42, thus ensuring a reliable connection with the liquid outlet pipe 41.

[0050] Refer to Figure 1 and Figure 5, the liquid inlet pipe 51 includes a first-stage liquid inlet pipe 511 and a second-stage liquid inlet pipe 512. The pressure relief valve 53 is connected between the first-stage liquid inlet pipe 511 and the second-stage liquid inlet pipe 512. The first-stage liquid inlet pipe 511 is connected to the bracket assembly 20, and the second-stage liquid inlet pipe 512 is connected between the lower piston 50 and the pressure relief valve 53. The second-stage liquid inlet pipe 512 can communicate with the brewing chamber 31 through the liquid inlet 514 provided on the lower piston 50. The horizontal position of the first-stage liquid inlet pipe 511 is higher than the horizontal position of the pressure relief valve 53. When controlling the water inlet of the brewing chamber 31, the pressure relief valve 53 is closed, and water can be supplied to the brewing chamber 31 through the first-stage liquid inlet pipe 511 and the second-stage liquid inlet pipe 512. A check valve can be provided on the first-stage liquid inlet pipe 511. When it is necessary to drain the liquid from the brewing chamber 31, the pressure relief valve 53 is opened, and the liquid can be drained to the pressure relief port 531 through the second-stage liquid inlet pipe 512. Since the horizontal position of the first-stage liquid inlet pipe 511 is higher than the horizontal position of the pressure relief valve 53, the liquid will preferentially enter the pressure relief port 531 and be discharged, and the check valve will further block the liquid from entering the first-stage liquid inlet pipe 511. Therefore, the water quality of the liquid in the first-stage liquid inlet pipe 511 will not be affected.

[0051] The working process of the above-mentioned brewing device 100 will be described in detail below. Specifically, taking the application of the brewing device 100 in the coffee machine scenario as an example, as Figure 6 shown, the brewing cylinder 30 rotates to the powder receiving position, that is, the filling opening 311 is in the open position, and coffee powder can be filled. The powder receiving position is the initial position of the brewing device 100. The lower piston 50 is joined below the brewing cylinder 30, and the coffee powder enters the brewing chamber 31 through the filling opening 311.

[0052] Referring to Figure 1 shown, the brewing cylinder 30 rotates and resets. When making coffee, first open the pressure relief valve 53, and then the upper piston 40 descends to as Figure 7At the extraction position shown, close the pressure relief valve 53. The water flow in the liquid inlet pipe 51 enters the brewing chamber 31 from the liquid inlet 514 at a certain pressure to soak and brew the coffee powder, forming coffee liquid. Under the action of the water flow pressure in the brewing chamber 31, the second valve ball 471 and the second elastic member 473 contract, and the liquid outlet 411 opens. The coffee liquid is discharged through the liquid outlet 411 on the upper piston 40. After the coffee is made and the water inlet stops, the second elastic member 473 rebounds and the second valve ball 471 resets. After completion, the pressure relief valve 53 remains closed, and the upper piston 40 starts to move upward, generating a negative pressure in the brewing cylinder 30, causing the first valve ball 451 to move downward and the first elastic member 453 to contract, and the reflux port 420 opens. The residual coffee liquid in the liquid outlet pipe 41 and its downstream pipeline flows through the reflux pipeline 43 to the coffee cake. Then open the pressure relief valve 53, and the upper piston 40 moves downward to squeeze the coffee cake. The residual liquid squeezed out from the coffee cake is discharged from the second-stage liquid inlet pipe 512 to the pressure relief port. Finally, keep the pressure relief valve 53 open, and the lower piston 50 moves upward relative to the brewing cylinder 30 to eject the coffee cake in the brewing chamber 31 to the upper end surface of the brewing cylinder 30, as Figure 8 shown in the position. While the brewing cylinder 30 rotates to the powder receiving position, slag scraping is performed.

[0053] To completely discharge the residual coffee liquid in the liquid outlet pipe 41 and its downstream pipeline, before the upper piston 40 moves downward to squeeze the coffee cake, the upper piston 40 can be repeatedly moved upward and downward. Among them, when the upper piston 40 moves upward, the pressure relief valve 53 is in the closed state, and when the upper piston 40 moves downward, the pressure relief valve 53 is in the open state; when the residual coffee liquid in the liquid outlet pipe 41 and its downstream pipeline is completely discharged into the brewing chamber 31, finally open the pressure relief valve 53, and the upper piston 40 moves downward to squeeze the coffee cake, and the residual liquid squeezed out from the coffee cake can be discharged from the pressure relief port.

[0054] When the user selects to clean the brewing device 100, open the pressure relief valve 53. After the upper piston 40 moves downward to the flushing position, close the pressure relief valve 53. The brewing cylinder 30 starts to intake water to form pressure, pushing open the second one-way valve 47 of the liquid outlet pipe 41 to clean the liquid outlet pipe 41. After the cleaning is completed, stop the water injection, the second elastic member 473 rebounds, the second valve ball 471 resets, and the liquid outlet pipe 41 closes. At this time, keep the pressure relief valve 53 in the closed state, and the upper piston 40 starts to move upward slowly, forming a negative pressure. The first one-way valve 45 of the reflux pipeline 43 opens, discharging the clear water in the liquid outlet pipe 41 and its downstream pipeline to the reflux pipeline 42 and finally discharging it into the brewing chamber 31. Then open the pressure relief valve 53 to discharge the liquid in the brewing chamber 31 from the second-stage liquid inlet pipe 512 to the pressure relief port, thereby achieving the cleaning effect.

[0055] Through the above cleaning of the brewing cylinder 30, the residual liquid in the brewing cylinder 30 and the pipeline can be effectively cleaned, ensuring the coffee quality and taste of each brewing.

[0056] Refer toFigure 9 , for another structural form of the upper piston 40a, a connecting pipe 415 is provided on the liquid outlet pipe 41, and a part of the connecting pipe 415 extends into the reflux pipe 43; an annular step portion 417 is provided outside the connecting pipe 415, and a first inner step 441 and a second inner step 442 are provided inside the reflux pipe 43. The first inner step 441 and the second inner step 442 are formed by sequentially increasing the inner diameter of the pipe. A second seal 444 is provided between the reflux pipe 43 and the connecting pipe 415. The connecting pipe 415 abuts against the first inner step 441, and the second seal 444 is defined between the annular step portion 417 and the second inner step 442. The liquid outlet pipe 41 and the reflux pipe 43 are provided in a split form, and the second seal 444 is limited both radially and axially along the pipe, ensuring the sealing performance between the liquid outlet pipe 41 and the reflux pipe 43.

[0057] The present utility model also provides a beverage machine 10, as Figure 10 shown in the figure. The beverage machine 10 includes the above-mentioned brewing device 100, and further includes a grinding device 11 and a beverage outlet 12. The grinding device 11 is used to convey beverage particles to the brewing chamber 31. The downstream of the liquid outlet pipe 41 is connected to the beverage outlet 12, and the pressure relief port 531 is connected to the waste water box 13 of the beverage machine 10 or connected to a container for accommodating waste water and waste residues outside the beverage machine 10.

[0058] In the above-mentioned embodiment, through the liquid outlet pipe 41 and the reflux pipe 43 provided inside the upper piston 40, after the beverage brewing is completed, a negative pressure is formed by the upward movement of the upper piston 40, so that the reflux pipe 43 is opened, and the remaining coffee liquid is discharged from the brewing chamber 31. By providing a first one-way valve 45 in the reflux pipe 43, it is ensured that the liquid can only enter the brewing chamber 31 from the reflux pipe 43 and will not flow into the liquid outlet pipe 41. The liquid inlet pipe 51 connected to the lower piston 50 can selectively communicate with the pressure relief port 531, which can effectively discharge the liquid returned from the reflux pipe 43 to the brewing chamber 31, further ensuring the cleanliness of the brewing chamber 31.

[0059] Of course, the above-mentioned brewing device 100 is not limited to being applied in a coffee machine, and can also be used in other beverage brewing devices, such as a tea machine or other devices for brewing beverages.

[0060] It should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0061] The series of detailed descriptions listed above are only specific descriptions of the feasible implementation modes of the present utility model, and they are not intended to limit the protection scope of the present utility model. Any equivalent implementation modes or changes made without departing from the technical spirit of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A brewing device, comprising: Bracket assembly; A brewing cylinder, disposed on the support assembly, the brewing cylinder being capable of forming a brewing chamber filled with beverage particles, the brewing chamber comprising a filling opening for filling the beverage particles; an upper piston selectively engageable with the brewing cylinder from above the filling opening to close the brewing chamber; a lower piston engaged with the brewing cylinder, wherein the lower piston is movable relative to the brewing cylinder to change the volume of the brewing chamber; A pressure relief valve, which can selectively control the brewing chamber to communicate with the pressure relief port; The invention is characterized in that: the upper piston is connected with a liquid outlet pipe and a reflux pipe, the liquid outlet pipe has a liquid outlet connected to the brewing chamber; the reflux pipe has a reflux port connected to the brewing chamber, the reflux pipe is connected with the liquid outlet pipe outside the brewing chamber; the reflux port is provided with a first one-way valve, the first one-way valve allows one-way communication from the reflux pipe to the brewing chamber; the liquid outlet is provided with a second one-way valve, the second one-way valve allows one-way communication from the brewing chamber to the liquid outlet pipe; The lower piston is connected to a liquid inlet pipe, and the brewing device can selectively discharge the liquid returned from the reflux pipe to the brewing chamber through the pressure relief port.

2. The brewing device according to claim 1, characterized in that: The return pipeline includes a first pipeline connected to the upper piston, the first pipeline has a tube cavity, the first one-way valve is arranged in the tube cavity, and the first one-way valve includes a first valve ball and an elastic member acting on the first valve ball.

3. The brewing device according to claim 2, characterized in that: A baffle is provided at the reflux port, the baffle is connected to the first pipe, the reflux port is formed between the baffle and the cavity wall of the tube cavity, a mounting column extending from the baffle is provided in the tube cavity, and the elastic member is sleeved on the mounting column.

4. The brewing device according to claim 2, characterized in that: The reflux pipeline also includes a second pipeline, which is connected between the liquid outlet pipeline and the first pipeline. A first sealing member is connected between the second pipeline and the first pipeline. A portion of the second pipeline extends into the first pipeline. The first sealing member is located between the cavity wall of the lumen and the second pipeline.

5. The brewing device according to claim 4, characterized in that: The second pipe includes an inserting section extending into the first pipe, an annular wall is arranged around the periphery of the inserting section, an annular groove is formed between the inserting section and the annular wall, and the first pipe extends into the annular groove.

6. The brewing device according to claim 2, characterized in that: A connecting pipe is provided on the liquid outlet pipe, and a part of the connecting pipe extends into the return pipe; an annular step portion is provided on the outside of the connecting pipe, and a first inner step and a second inner step are provided on the inside of the return pipe, and the first inner step and the second inner step are formed by successively increasing the inner diameter of the pipe. A second sealing member is provided between the return pipe and the connecting pipe, and the connecting pipe abuts against the first inner step, and the second sealing member is defined between the annular step portion and the second inner step.

7. The brewing device according to claim 1, characterized in that: The upper piston includes a piston cylinder, the liquid outlet pipe and the return pipe are arranged in the piston cylinder, one of the end of the liquid outlet pipe away from the liquid outlet and the piston cylinder is provided with a first clamping block, and the other is provided with a first clamping groove, and the first clamping block is inserted into the first clamping groove.

8. The brewing device according to claim 7, characterized in that: It also includes a pipe joint connected to the liquid outlet pipe, along the circumference of the liquid outlet pipe, one of the pipe joint and the inner wall of the piston cylinder is provided with a limiting groove, and the other is provided with a limiting portion, the limiting groove cooperates with the limiting portion to limit the relative rotation of the pipe joint and the piston cylinder; one of the pipe joint and the piston cylinder is provided with a second clamping block, and the other is provided with a second clamping groove, and the second clamping block is inserted into the second clamping groove.

9. The brewing device according to claim 1, characterized in that: The liquid inlet pipe includes a first section of the liquid inlet pipe and a second section of the liquid inlet pipe, the pressure relief valve is connected between the first section of the liquid inlet pipe and the second section of the liquid inlet pipe, the first section of the liquid inlet pipe is connected to the bracket assembly, the second section of the liquid inlet pipe is connected between the lower piston and the pressure relief valve, and the horizontal position of the first section of the liquid inlet pipe is higher than the horizontal position of the pressure relief valve.

10. A beverage machine, characterized in that: The beverage machine comprises the brewing device according to any one of claims 1 to 9, wherein the beverage machine further comprises a grinding device and a beverage outlet, wherein the grinding device is used to transfer the beverage particles to the brewing chamber, and the downstream of the liquid outlet pipe is connected to the beverage outlet.

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