CN223008941U - Brewing device and beverage machine - Google Patents

Abstract

The utility model discloses a brewing device and a beverage machine, wherein the brewing device comprises a support assembly, a brewing cylinder arranged on the support assembly, wherein the brewing cylinder can form a brewing chamber, the brewing chamber comprises a filling opening, an upper piston is selectively connected with the brewing cylinder from above the filling opening to seal the brewing chamber, a lower piston is movably connected with the brewing cylinder, a pressure release valve is selectively used for controlling the brewing chamber to be communicated with a pressure release opening, a liquid outlet pipeline is provided with a liquid outlet communicated with the brewing chamber, a backflow pipeline is provided with a backflow opening communicated with the brewing chamber, the backflow pipeline is communicated with the liquid outlet pipeline at the outer side of the brewing chamber, a first one-way valve is arranged at the backflow opening, the first one-way valve allows one-way communication from the backflow pipeline to the brewing chamber, a second one-way valve is arranged at the liquid outlet, 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 returned from the backflow pipeline to the brewing chamber through the pressure release opening. Through simple structural design, reduce cost.

Description

Brewing device and beverage machine

Technical Field

The utility model relates to the technical field of beverage preparation, in particular to a brewing device and a beverage machine.

Background

In the existing beverage machine technical field, automatic brewing devices are widely used in homes and businesses. The automatic brewing device can realize a series of processes from grinding beverage raw materials, heating water to brewing beverage particles through program control, so that a user can conveniently and quickly enjoy high-quality beverage. These brewing devices generally comprise a brewing cylinder, an upper piston and a lower piston for forming and adjusting the volume of the brewing chamber, so as to achieve extraction of the beverage particles. However, the existing brewing device has some problems in the use process, especially after the brewing process is finished, the residual beverage liquid in the brewing device and the pipeline is difficult to thoroughly empty, and the taste of the subsequent beverage and the sanitary condition of the brewing device are affected.

Aiming at the defects of the prior art, some improvements are also available on the market. For example, some brewing devices pump residual beverage liquid from the line by adding an evacuation pump, or reduce residual liquid by designing a special structure. These solutions solve some of the problems to some extent, but also present some new challenges and drawbacks. For example, adding an evacuation pump not only increases equipment costs, but also increases the complexity and maintenance difficulty of the device. In addition, many of these improvements still do not allow for complete removal of residual beverage liquid from the brewing device and the tubing, especially after prolonged use, which can easily cause bacterial growth within the device, affecting the hygiene and mouthfeel of the beverage.

Disclosure of utility model

The utility model aims to provide a brewing device which is reliable in use and low in cost.

Another object of the present utility model is to provide a beverage machine that is reliable in use and low in cost.

To achieve one of the above objects, the present utility model provides a brewing device comprising:

a 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 including 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 coupled to the brewing cylinder, the lower piston being movable relative to the brewing cylinder to vary the volume of the brewing chamber;

the pressure relief valve is used for selectively controlling 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 reflux pipeline is provided with a reflux port communicated with the brewing chamber, and the reflux pipeline is communicated with the liquid outlet pipeline at the outer side of the brewing chamber; the return port is provided with a first one-way valve allowing one-way communication from the return conduit to the brewing chamber; the liquid outlet is provided with a second one-way valve which 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 returned to the brewing chamber from the return pipeline through the pressure relief opening.

Compared with the prior art, the utility model has the beneficial effects that the liquid outlet pipeline is communicated with the reflux pipeline, and after the brewed beverage liquid is output by the liquid outlet pipeline or when the brewing cylinder is cleaned, the first one-way valve can be opened to enable the beverage liquid remained in the liquid outlet pipeline and the pipeline at the downstream of the liquid outlet pipeline to return to the brewing chamber from the reflux pipeline and then be discharged from the pressure release valve. Through simple structural design, avoided using high-cost, the solution of high complexity such as emptying devices, reduced equipment cost and maintenance degree of difficulty. In addition, through the structural design of optimizing, realized efficient clean function, can reduce the consumption of water resource in the cleaning process, reduce use cost and environmental burden, ensure the coffee quality and the taste of brewing at every turn simultaneously.

As a further improvement of an embodiment of the present utility model, the return line includes a first line connected to the upper piston, the first line having a lumen, the first check valve being disposed in the lumen, the first check valve including a first valve ball and an elastic member acting on the first valve ball.

As a further improvement of an embodiment of the present utility model, a baffle is disposed at the backflow port, the baffle is connected to the first pipe, the backflow port is formed between the baffle and a cavity wall of the pipe cavity, a mounting column extending from the baffle is disposed in the pipe cavity, and the elastic member is sleeved on the mounting column.

As a further improvement of an embodiment of the present utility model, the return line further comprises a second line connected between the outlet line and the first line, a first seal being connected between the second line and the first line, a portion of the second line extending into the first line, the first seal being located between the lumen wall of the lumen and the second line.

As a further improvement of an embodiment of the utility model, the second pipe comprises a plug section extending into the first pipe, an annular wall is arranged at the periphery of the plug section, an annular groove is formed by the interval between the plug section and the annular wall, and the first pipe extends into the annular groove.

As a further improvement of one embodiment of the utility model, a connecting pipe is arranged on the liquid outlet pipe, a part of the connecting pipe extends into the backflow pipe, an annular step part is arranged outside the connecting pipe, a first inner step and a second inner step are arranged inside the backflow pipe, the first inner step and the second inner step are formed by sequentially increasing the inner diameter of the pipe, a second sealing piece is arranged between the backflow pipe and the connecting pipe, the connecting pipe is abutted against the first inner step, and the second sealing piece is limited between the annular step part and the second inner step.

As a further improvement of an embodiment of the present utility model, the upper piston includes a piston cylinder, the liquid outlet pipe and the backflow pipe are disposed in the piston cylinder, one of the liquid outlet pipe 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.

As a further improvement of an embodiment of the utility model, the device further comprises a pipe joint connected to the liquid outlet pipe, one of the pipe joint and the inner wall of the piston cylinder is provided with a limit groove along the circumferential direction of the liquid outlet pipe, the other one is provided with a limit part, the limit groove is matched with the limit part 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 one is provided with a second clamping groove, and the second clamping block is inserted into the second clamping groove.

As a further improvement of an embodiment of the present utility model, the liquid inlet pipe includes a first section liquid inlet pipe and a second section liquid inlet pipe, the pressure release valve is connected between the first section liquid inlet pipe and the second section liquid inlet pipe, the first section liquid inlet pipe is connected to the bracket component, the second section liquid inlet pipe is connected between the lower piston and the pressure release valve, and the horizontal position of the first section liquid inlet pipe is higher than the horizontal position of the pressure release valve.

The utility model also provides a beverage machine comprising a brewing device according to any of the embodiments above, the beverage machine further comprising grinding means for conveying the beverage particles to the brewing chamber and a beverage outlet, the outlet conduit being connected downstream to the beverage outlet.

Drawings

Fig. 1 is a schematic view of a brewing device according to an embodiment of the present utility model.

Fig. 2 is a schematic perspective view of the upper piston portion of the brewing device of fig. 1.

Fig. 3 is a schematic cross-sectional view taken along line A-A in fig. 2.

Fig. 4 is a schematic cross-sectional view taken along line B-B in fig. 3.

Fig. 5 is a schematic cross-sectional view taken along line C-C of fig. 1.

Fig. 6 is a schematic view of the brewing chamber of the brewing device of fig. 1 in a powder receiving state.

Fig. 7 is a schematic view of the brewing device of fig. 1 with the brewing chamber in a closed state.

Fig. 8 is a schematic view of the brewing device of fig. 1 in a state of ejecting cake.

Fig. 9 is a schematic view of another structural form of the upper piston part in fig. 1.

Fig. 10 is a schematic view of a beverage machine according to an embodiment of the utility model.

Detailed Description

The present utility model will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the utility model and structural, methodological, or functional modifications of these embodiments that may be made by one of ordinary skill in the art are included within the scope of the utility model.

It will be appreciated that terms such as "upper," "above," "lower," "below," and the like, as used herein, refer to spatially relative positions and are used for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The term spatially relative position may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

The brewing device according to the embodiment of the present utility model will be described by taking a brewing device capable of brewing coffee particles as an example. Referring to fig. 1 to 4, in the present embodiment, the brewing device 100 includes a holder assembly 20 and a brewing cylinder 30 provided to the holder assembly 20, the brewing cylinder 30 being capable of forming a brewing chamber 31 filled with beverage particles, the brewing chamber 31 including a filling opening 311 for filling the beverage particles, the beverage particles being fillable into the brewing chamber 31 from the filling opening 311.

The brewing device 100 further comprises an upper piston 40, a lower piston 50 and a pressure relief valve 53. The upper piston 40 is selectively engageable with the brewing cylinder 30 from above the filling opening 311 to close the brewing chamber 31. The lower piston 50 is coupled to the brewing cylinder 30 and is movable relative to the brewing cylinder 30 to change the volume of the brewing chamber 31. The lower piston 50 and the brewing cylinder 30 are relatively moved in a first direction, e.g. in the direction of arrow M in fig. 1, to change the volume of the brewing chamber 31. In this embodiment, the brewing cylinder 30 is inclined and the brewing cylinder 30 is configured as a cylinder, the first direction may be considered as the axial direction of the brewing cylinder 30, and in other embodiments the brewing cylinder 30 may be positioned vertically, the axial direction of the brewing cylinder 30 then being perpendicular to the horizontal direction. The pressure relief valve 53 selectively controls the brew chamber 31 to communicate with the pressure relief port 531 to drain liquid from within the brew chamber 31 through the pressure relief port 531.

In this embodiment, the bracket assembly 20 is provided with a drive mechanism, which may be a mechanism that transmits motion of a power source to the upper piston 40 and the lower piston 50 to move the upper piston 40 or the lower piston 50 in a straight line with respect to the brewing cylinder 30.

Wherein the upper piston 40 is connected with a liquid outlet pipe 41 and a return pipe 43. The liquid outlet duct 41 has a liquid outlet 411 communicating with the brewing chamber 31, the return duct 43 has a return outlet 420 communicating with the brewing chamber 31, and the return duct 43 communicates with the liquid outlet duct 41 outside the brewing chamber 31. The return port 420 is provided with a first one-way valve 45, the first one-way valve 45 allowing one-way communication from the return conduit 43 to the brewing chamber 31. The liquid outlet 411 is provided with a second one-way valve 47, the second one-way valve 47 allowing one-way communication from the brewing chamber 31 to the liquid outlet conduit 41. The lower piston 50 is connected to a liquid inlet conduit 51, and the brewing device 100 selectively discharges liquid returned from the return conduit 43 to the brewing chamber 31 through a pressure relief port 531.

Specifically, the pressure release valve 53 may be disposed on the liquid inlet pipe 51, and may not only supply liquid to the brewing chamber 31 but also discharge liquid in the brewing chamber 31 through the liquid inlet pipe 51, so as to simplify the pipe arrangement.

The outlet conduit 41 communicates with the return conduit 43, and after the outlet conduit 41 outputs brewed beverage liquid, the first one-way valve 45 may be opened to allow beverage liquid remaining in the outlet conduit 41 and in the conduit downstream of the outlet conduit 41 to return from the return conduit 43 into the brewing chamber 31 and then to be discharged from the pressure relief port 531. In the case of cleaning the brewing cylinder 30, the liquid beverage remaining in the liquid outlet pipe 41 and the pipe downstream of the liquid outlet pipe 41 may be returned from the return pipe 43 to the brewing chamber 31 and discharged from the pressure release port 531. The design of the return pipe 43 enables residual beverage liquid in the brewing cylinder 30 and the pipeline to be discharged in a return way through the negative pressure effect after the brewing is finished, so that the automation degree and the cleaning effect of the device are improved. Through simple structural design, avoided using high-cost, the solution of high complexity such as emptying devices, reduced equipment cost and maintenance degree of difficulty. In addition, through the structural design of optimizing, realized efficient clean function, can reduce the consumption of water resource in the cleaning process, reduce use cost and environmental burden, ensure beverage quality and taste of dashing at every turn simultaneously.

Further, the return pipe 43 includes a first pipe 431 connected to the upper piston 40, the first pipe 431 has a lumen 430, the first check valve 45 is disposed in the lumen 430, the first check 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 for opening or closing the return port 420, and the first elastic member 453 is used for pressing the first valve ball 451 to close the return port 420. The baffle 433 is disposed at the return port 420, the baffle 433 is connected to the first pipe 431, and the return port 420 is formed between the baffle 433 and the wall of the lumen 430. A mounting post 435 extending from the baffle 433 is provided in the lumen 430, and a first elastic member 453 is sleeved on the mounting post 435. When the upper piston 40 moves away from the lower piston 50 relative to the brewing cylinder 30, creating a negative pressure environment within the brewing chamber 31, the first valve ball 451 can open the return port 420 against the force of the first resilient member 453. The first elastic member 453 is sleeved on the mounting post 435 on the baffle 433, so that reliable support can be provided for the first elastic member 453, and the movement range of the first valve ball 451 can be limited, thereby ensuring more reliable opening and closing of the first check valve 45.

The second check 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 being used for opening or closing the liquid outlet 411, the second elastic member 473 being used for pressing the second valve ball 471 to close the liquid outlet 411. The elastic force of the second elastic member 473 acts opposite to the elastic force of the first elastic member 453 to ensure that the second check valve 47 is in a state of closing the liquid outlet 411 when the first check valve 45 opens the return port 420. When the upper piston 40 moves towards the lower piston 50 relative to the brewing cylinder 30, a pressure is generated in the brewing chamber 31 and the second valve ball 471 can open the liquid outlet 411 against the force of the first elastic member 453. Beverage liquid may be discharged from the outlet conduit 41 as well as from the downstream conduit to the beverage outlet 12.

Wherein, first valve ball 451 and second valve ball 471 are each configured as a glass ball, and first elastic member 453 and second elastic member 473 are each configured as a compression spring, which is low in cost and reliable in use. The end of the upper piston 40 facing the brewing chamber 31 is provided with a filter screen 48 for restricting the discharge of beverage particles from the outlet conduit 41 when the beverage is brewed.

With continued reference to fig. 3, the return line 43 further includes a second line 432, the second line 432 being connected between the liquid outlet line 41 and the first line 431, a first seal 434 being connected between the second line 432 and the first line 431, a portion of the second line 432 extending into the first line 431, the first seal 434 being located between the wall of the lumen 430 and the second line 432. The return conduit 43 is provided as a two-section conduit seal connection for ease of manufacture and assembly.

The outside of the second pipe 432 is provided with a flange 436, a part of the second pipe 432 extends into the first pipe 431, and the flange 436 abuts against the end of the first pipe 431 to position the connection between the first pipe 431 and the second pipe 432.

The second conduit 432 comprises a plug section 437 protruding into the first conduit 431, the periphery of the plug section 437 being provided with an annular wall 438, the spacing between the plug section 437 and the annular wall 438 forming an annular groove 439, the first conduit 431 protruding into the annular groove 439. The annular wall 438 may be provided on the flange 436 to make the connection of the two pipes more reliable. The second pipe 432 and the liquid outlet pipe 41 can be welded together by ultrasonic waves, and the structure is simple.

In addition, the upper piston 40 includes a piston cylinder 42, a liquid outlet pipe 41 and a return pipe 43 are disposed in the piston cylinder 42, one of the end of the liquid outlet pipe 41 away from the liquid outlet 411 and the piston cylinder 42 is provided with a first clamping block 413, the other is provided with a first clamping groove 423, and the first clamping block 413 is inserted into the first clamping groove 423. The direction of the acting force of the first elastic member 453 and the second elastic member 473 is along the extending direction of the first pipe 431 and the liquid outlet pipe 41, and the first pipe 431 and the second pipe 432 can be prevented from leaking due to displacement by limiting the first clamping block 413 by the first clamping groove 423. 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, so that the manufacturing and the assembly are convenient.

Further, the brewing device 100 further comprises a tube joint 46 connected to the liquid outlet tube 41, wherein along the circumferential direction of the liquid outlet tube 41, one of the tube 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, and the limiting groove 461 cooperates with the limiting portion 421 to limit the relative rotation of the tube joint 46 and the piston cylinder 42. The limiting groove 461 may be formed by a gap between two claws arranged at intervals on the pipe joint 46, the limiting portion 421 may be two ribs on the inner wall of the piston cylinder 42, the two ribs may extend along the axial direction of the piston cylinder 42, and the two ribs extend between the two claws, so that the pipe joint 46 is convenient to be connected with 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, the other is provided with a second clamping groove 422, and the second clamping block 462 is inserted into the second clamping groove 422, so that the pipe joint 46 can be axially limited. 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, so that the manufacturing and the assembly are convenient. The pipe joint 46 is limited in the axial direction and the circumferential direction of the liquid outlet pipe 41, so that the position of the pipe joint 46 in the piston cylinder 42 can be ensured to be fixed, and the position of the pipe joint is not changed due to the movement of the piston cylinder 42, thereby ensuring the reliable connection with the liquid outlet pipe 41.

Referring to fig. 1 and 5, the liquid inlet pipe 51 includes a first-stage liquid inlet pipe 511 and a second-stage liquid inlet pipe 512, the pressure release 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, the second-stage liquid inlet pipe 512 is connected between the lower piston 50 and the pressure release valve 53, the second-stage liquid inlet pipe 512 can be communicated with the brewing chamber 31 through a liquid inlet 514 arranged on the lower piston 50, and the horizontal position of the first-stage liquid inlet pipe 511 is higher than that of the pressure release valve 53. When controlling the inflow of the brewing chamber 31, the pressure release valve 53 is closed, and water can be supplied to the brewing chamber 31 through the first stage inlet pipe 511 and the second stage inlet pipe 512. The first section liquid inlet pipe 511 may be provided with a check valve, when the liquid is required to be discharged from the brewing chamber 31, the pressure release valve 53 is opened, and the liquid can be discharged to the pressure release opening 531 through the second section liquid inlet pipe 512, so that the liquid can enter the pressure release opening 531 preferentially to be discharged due to the fact that the horizontal position of the first section liquid inlet pipe 511 is higher than that of the pressure release valve 53, and the check valve can further block the liquid from entering the first section liquid inlet pipe 511, so that the water quality of the liquid in the first section liquid inlet pipe 511 is not affected.

The operation of the brewing device 100 will be described in detail below. Taking a scenario in which the brewing device 100 is applied to a coffee machine as an example, as shown in fig. 6, the brewing cylinder 30 rotates to a powder receiving position, that is, the filling opening 311 is in an open position, so that filling of coffee powder can be performed, and the powder receiving position is the initial position of the brewing device 100. The lower piston 50 is coupled below the brewing cylinder 30 and the coffee grounds enter the brewing chamber 31 through the filling opening 311.

Referring to fig. 1, when the brewing cylinder 30 is rotated and reset to make coffee, the pressure release valve 53 is opened first, then the upper piston 40 is moved down to the extraction position shown in fig. 7, the pressure release valve 53 is closed, water flow from the liquid inlet pipe 51 enters the brewing chamber 31 from the liquid inlet 514 at a certain pressure to infiltrate and brew coffee powder, so as to form coffee liquid, the second valve ball 471 is contracted under the action of the water flow pressure in the brewing chamber 31, the liquid outlet 411 is opened, and the coffee liquid is discharged through the liquid outlet 411 on the upper piston 40. The coffee making is completed, the water inflow is stopped, the second elastic member 473 rebounds, and the second valve ball 471 is reset. After the completion, the pressure release valve 53 continues to be kept in a closed state, the upper piston 40 starts to move upwards, negative pressure is generated in the brewing cylinder 30, the first valve ball 451 is caused to move downwards, the first elastic member 453 is contracted, the backflow port 420 is opened, residual coffee liquid in the liquid outlet pipe 41 and the downstream pipe thereof flows to the coffee grounds through the backflow pipe 43, then the pressure release valve 53 is opened, the upper piston 40 presses the coffee grounds downwards, and residual liquid extruded by the coffee grounds is discharged from the second-stage liquid inlet pipe 512 to the pressure release port. Finally, the pressure relief valve 53 is kept open, and the lower piston 50 is moved upwards relative to the brewing cylinder 30 to eject the coffee grounds cake in the brewing chamber 31 to the upper end surface of the brewing cylinder 30, as shown in the position of fig. 8. The brewing cylinder 30 rotates to the powder receiving position and simultaneously scrapes the slag.

In order to completely discharge the residual coffee liquid in the liquid outlet pipe 41 and the downstream pipe thereof, the upper piston 40 can repeatedly move up and down before the upper piston 40 moves down to squeeze the coffee grounds, wherein the pressure release valve 53 is closed when the upper piston 40 moves up, the pressure release valve 53 is opened when the upper piston 40 moves down, and when the residual coffee liquid in the liquid outlet pipe 41 and the downstream pipe thereof is completely discharged into the brewing chamber 31, the pressure release valve 53 is finally opened, the upper piston 40 moves down to squeeze the coffee grounds, and the residual liquid extruded by the coffee grounds is discharged through the pressure release opening.

When the user selects the brewing device 100 to clean, the pressure release valve 53 is opened, the upper piston 40 descends to the flushing position, then the pressure release valve 53 is closed, the brewing cylinder 30 starts to enter water to form pressure, the second one-way valve 47 of the liquid outlet pipeline 41 is jacked up, and the liquid outlet pipeline 41 is cleaned. After the cleaning is finished, the water injection is stopped, the second elastic piece 473 rebounds, the second valve ball 471 is reset, the liquid outlet pipe 41 is closed, the pressure release valve 53 is kept in a closed state at the moment, the upper piston 40 starts to slowly ascend to form negative pressure, the first one-way valve 45 of the backflow pipe 43 is opened, clean water in the liquid outlet pipe 41 and downstream pipes thereof is discharged to the backflow pipe 42 and finally discharged to the brewing chamber 31, and then the pressure release valve 53 is opened to discharge liquid in the brewing chamber 31 from the second section liquid inlet pipe 512 to a pressure release port, so that the cleaning effect is achieved.

Through the cleaning of the brewing cylinder 30, residual liquid in the brewing cylinder 30 and the pipeline can be effectively cleaned, and the quality and the taste of coffee brewed each time are ensured.

Referring to fig. 9, in another embodiment of the upper piston 40a, a connection pipe 415 is provided in the liquid outlet pipe 41, a part of the connection pipe 415 extends into the return pipe 43, an annular step portion 417 is provided outside the connection pipe 415, a first inner step 441 and a second inner step 442 are provided inside the return 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 member 444 is provided between the return pipe 43 and the connection pipe 415, the connection pipe 415 abuts against the first inner step 441, and the second seal member 444 is defined between the annular step portion 417 and the second inner step 442. The liquid outlet pipe 41 and the return pipe 43 are provided as separate members, and the second seal 444 is defined in both the radial direction and the axial direction of the pipe, ensuring tightness between the liquid outlet pipe 41 and the return pipe 43.

The present utility model also provides a beverage maker 10, as shown in fig. 10, the beverage maker 10 comprising the above-mentioned brewing device 100, further comprising grinding means 11 and a beverage outlet 12, the grinding means 11 being adapted to convey beverage particles to the brewing chamber 31, the outlet conduit 41 being connected downstream to the beverage outlet 12, the pressure relief opening 531 being connected to a waste water box 13 of the beverage maker 10 or to a waste water and waste residue containing container outside the beverage maker 10.

In the above embodiment, after the beverage is brewed, the liquid outlet pipe 41 and the return pipe 43 are provided in the upper piston 40, and the return pipe 43 is opened by the negative pressure generated by the upward movement of the upper piston 40, so that the residual coffee liquid is discharged from the brewing chamber 31. By providing the first non-return valve 45 in the return conduit 43, it is ensured that liquid can only enter the brewing chamber 31 from the return conduit 43 and not flow to the outlet conduit 41. The liquid inlet pipe 51 connected with the lower piston 50 is selectively communicated with the pressure relief opening 531, so that the liquid returned to the brewing chamber 31 by the return pipe 43 can be effectively discharged, and the cleaning of the brewing chamber 31 is further ensured.

Of course, the brewing device 100 described above is not limited to use in a coffee machine, but may be used in other beverage brewing devices, such as tea machines or other devices for brewing beverages.

It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.

The above list of detailed descriptions is only specific to practical embodiments of the present utility model, and they are not intended to limit the scope of the present utility model, and all equivalent embodiments or modifications that do not depart from the spirit of the present utility model should be included in the scope of the present utility model.

Claims (10)

1. A brewing device comprising:

a 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 including 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 coupled to the brewing cylinder, the lower piston being movable relative to the brewing cylinder to vary the volume of the brewing chamber;

the pressure relief valve is used for selectively controlling the brewing chamber to be communicated with the pressure relief opening;

The brewing device is characterized in that the upper piston is connected with a liquid outlet pipe and a reflux pipe, the liquid outlet pipe is provided with a liquid outlet communicated with the brewing chamber, the reflux pipe is provided with a reflux port communicated with the brewing chamber, the reflux pipe is communicated with the liquid outlet pipe at the outer side of the brewing chamber, the reflux port is provided with a first one-way valve which allows one-way communication from the reflux pipe to the brewing chamber, the liquid outlet is provided with a second one-way valve which allows one-way communication from the brewing chamber to the liquid outlet pipe;

The lower piston is connected with a liquid inlet pipeline, and the brewing device can selectively discharge liquid returned to the brewing chamber from the return pipeline through the pressure relief opening.

2. The brewing device of claim 1, wherein the return conduit comprises a first conduit connected to the upper piston, the first conduit having a lumen, the first one-way valve being disposed within the lumen, the first one-way valve comprising a first valve ball and an elastic member acting on the first valve ball.

3. The brewing device according to claim 2, wherein 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 tube cavity, a mounting post extending from the baffle is provided in the tube cavity, and the elastic member is sleeved on the mounting post.

4. The brewing device of claim 2, wherein the return conduit further comprises a second conduit connected between the outlet conduit and the first conduit, a first seal connected between the second conduit and the first conduit, a portion of the second conduit extending into the first conduit, the first seal being located between a wall of the lumen and the second conduit.

5. The brewing device of claim 4, wherein the second conduit comprises a plug section extending into the first conduit, an annular wall is disposed about a periphery of the plug section, a space between the plug section and the annular wall forms an annular groove, and the first conduit extends into the annular groove.

6. The brewing device according to claim 2, wherein a connecting pipe is provided on the liquid outlet pipe, a part of the connecting pipe extends into the backflow pipe, an annular step portion is provided outside the connecting pipe, a first inner step and a second inner step are provided inside the backflow pipe, 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 backflow pipe and the connecting pipe, the connecting pipe abuts against the first inner step, and the second sealing member is limited between the annular step portion and the second inner step.

7. The brewing device according to claim 1, wherein the upper piston comprises a piston cylinder, the liquid outlet pipe and the backflow pipe are arranged in the piston cylinder, one of the liquid outlet pipe and the piston cylinder is provided with a first clamping block at one end far away from the liquid outlet, and the other one 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, further comprising a tube joint connected to the liquid outlet tube, wherein one of the tube joint and the inner wall of the piston tube is provided with a limit groove along the circumferential direction of the liquid outlet tube, the other one is provided with a limit part, the limit groove cooperates with the limit part to limit the relative rotation of the tube joint and the piston tube, one of the tube joint and the piston tube is provided with a second clamping block, and the other one is provided with a second clamping groove, and the second clamping block is inserted into the second clamping groove.

9. The brewing device of claim 1, wherein the liquid inlet conduit comprises 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, the second section of liquid inlet pipe is connected between the lower piston and the pressure relief valve, and the horizontal position of the first section of liquid inlet pipe is higher than the horizontal position of the pressure relief valve.

10. Beverage machine comprising a brewing device according to one of claims 1 to 9, further comprising grinding means for conveying the beverage particles to the brewing chamber and a beverage outlet, downstream of which the outlet conduit is connected.