Brewing device and coffee machine

Abstract

The brewing device comprises a frame, an upper piston, a lower piston, a brewing cylinder and a rotating shaft, the upper piston, the lower piston, the brewing cylinder and the rotating shaft are installed on the frame, and when the lower piston and the brewing cylinder are driven by the rotating shaft to move upwards to the position of the lower piston, the brewing cylinder is driven by the rotating shaft to move upwards to the position of the lower piston. A brewing barrel used for brewing coffee is formed among the upper piston, the lower piston and the brewing cylinder, the coffee machine further comprises a heating mechanism, the top of the upper piston is sunken downwards to form a mounting cavity, and the heating mechanism is mounted in the mounting cavity and used for heating the upper piston and transferring heat into the brewing barrel. Through the arrangement of the heating mechanism, the upper piston is heated, and the upper piston can transfer part of heat into the brewing barrel, so that the temperature of coffee liquid output by the brewing device is increased, and brewed coffee is normal in temperature and uniform in taste.

Description

Technical Field

[0001] The present invention relates to the technical field of coffee machines, and in particular to a brewing device and a coffee machine. Background Art

[0002] A coffee machine is a machine used to make coffee. It can make coffee by grinding coffee beans, applying pressurized steam or water pumps, etc. Coffee machines usually have multiple functions, such as adjusting coffee concentration, making different types of coffee, etc.; they are widely used in homes, offices, coffee shops and other places;

[0003] As shown in the U.S. invention patent with publication number: US5316781A and patent name: Brewing device for coffee machine and method for producing coffee, when brewing coffee, coffee powder is fed into the brewing cylinder through the powder guide mechanism, and a brewing cylinder for brewing coffee is formed between the lower piston, the upper piston and the brewing cylinder. After the coffee is brewed, the coffee liquid in the brewing cylinder is pumped to the liquid outlet channel through the pressure relief valve of the upper piston and injected into the user's coffee cup.

[0004] Due to the influence of weather, in low temperature conditions, especially when the coffee machine is making the first cup of coffee, the temperature of the brewed coffee is usually low, which affects the taste of the coffee. When brewing multiple cups of coffee continuously, this problem will be solved, because the brewing of the first cup of coffee is equivalent to preheating the brewing cylinder, so that the subsequent brewing temperature of the coffee is normal and the taste is uniform. Especially in commercial automatic coffee machines, because most customers buy coffee intermittently, the taste of the brewed coffee is inconsistent.

[0005] In the prior art, when brewing coffee, a limiting mechanism is required to make the moving speed of the lower piston slower than that of the brewing cylinder, thereby reducing the volume of the brewing chamber and forming a coffee powder cake. However, the limiting mechanism of the prior art has a complex structure and high cost.

[0006] When the existing powder guide mechanism feeds coffee powder into the brewing cylinder, due to static electricity, part of the coffee powder will pass through the inner cavity of the powder guide mechanism and adhere to the outer wall of the powder guide mechanism, so that the amount of coffee powder in the brewing cylinder is reduced and the concentration of coffee is difficult to ensure.

[0007] In view of this, it is necessary to propose a new technical solution to solve the above technical problems. Summary of the invention

[0008] In view of the deficiencies in the prior art, an object of the present invention is to provide a brewing device and a coffee machine to solve at least one problem raised in the background technology.

[0009] In order to achieve the above-mentioned objectives, the first aspect of the present invention provides a brewing device, including a frame, an upper piston, a lower piston, a brewing cylinder and a rotating shaft, wherein the upper piston, the lower piston, the brewing cylinder and the rotating shaft are respectively installed on the frame, and when the lower piston and the brewing cylinder move upward to the lower piston under the drive of the rotating shaft, a brewing cylinder for brewing coffee is formed between the upper piston, the lower piston and the brewing cylinder, and also includes a heating mechanism, the top of the upper piston is recessed downward to form an installation cavity, and the heating mechanism is installed in the installation cavity for heating the upper piston and transferring heat to the brewing cylinder.

[0010] In a further technical solution, the heating mechanism comprises:

[0011] A heat conducting block, mounted on the upper piston;

[0012] A heating block is arranged above the upper piston, and its bottom is in contact with the top of the heat-conducting block;

[0013] A heater, mounted on the heating block;

[0014] The heater is used to heat the heating block, and the heat-conducting block is used to transfer the heat of the heating block to the upper piston and the brewing cylinder.

[0015] In a further technical solution, at least one limiting member protrudes upward from the bottom of the installation cavity, and the bottom of the heat conductive block is recessed upward to form limiting grooves corresponding to the number of the limiting members, and one of the limiting grooves is engaged with one of the limiting members.

[0016] In a further technical solution, a pressure relief valve for passing coffee liquid is installed in the installation cavity, a first through hole for installing the pressure relief valve is opened in the middle of the heat conductive block, the input end of the pressure relief valve is connected to the output end of the brewing cylinder, the output end of the pressure relief valve is provided with a liquid outlet pipe, and a second through hole for passing the liquid outlet pipe is opened in the middle of the heating block.

[0017] In a further technical solution, a slot penetrating the upper piston is formed on the side wall of the upper piston, a latch is provided in the slot, a through slot is formed on the heat conductive block, and the latch passes through the through slot and the slot respectively and penetrates the heat conductive block and the upper piston.

[0018] A further technical solution further includes a limiting mechanism, which includes:

[0019] An elastic buckle is installed on the lower piston and has a limiting cavity in the middle;

[0020] A limiting buckle, the bottom of which is mounted on the bottom of the frame, and the top of which extends into the limiting cavity and is engaged with the elastic buckle;

[0021] Wherein, the elastic buckle includes a mounting seat and at least two spring plates, the mounting seat is connected to the lower piston, at least two spring plates are respectively mounted on the mounting seat, and there is a gap between two adjacent spring plates.

[0022] In a further technical solution, the inner side of the spring sheet protrudes toward the axial position of the mounting seat to form a first locking protrusion for limiting the limiting buckle, and the outer side of the limiting buckle protrudes outward to form a second locking protrusion that cooperates with the first locking protrusion.

[0023] In a further technical solution, the limiting mechanism also includes a mounting member and a fixing member, the mounting member passes through the mounting seat and extends into the lower piston, the mounting seat has a first mounting hole, and the mounting member has a second mounting hole, when the mounting member extends into the second mounting groove, the first mounting hole coincides with the second mounting hole, and the fixing member fixes the mounting member in the mounting seat through the first mounting hole and the second mounting hole.

[0024] In a further technical solution, a powder guiding mechanism is also included, and the powder guiding mechanism includes: a powder channel, the cross section of which is "U"-shaped, and the two sides are respectively installed on the inner sides of the two frames;

[0025] A baffle plate is installed at the bottom of the powder channel, and the width of the baffle plate is greater than or equal to the depth of the powder channel;

[0026] When the brewing cylinder moves upward to the powder adding position, the bottom of the powder channel faces the center of the brewing cylinder.

[0027] In a second aspect, the present invention further provides a coffee machine including a brewing device.

[0028] Compared with the prior art, the present invention brings the following technical effects:

[0029] A brewing device of the present invention heats an upper piston by setting a heating mechanism, and the upper piston can also transfer part of the heat to the brewing cylinder, thereby increasing the temperature of the coffee liquid output by the brewing device, so that the brewed coffee has a normal temperature and a uniform taste.

[0030] The coffee machine of the present invention includes all the technical features and beneficial effects of a brewing device, so they are not described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a structural schematic diagram of a brewing device of the present invention.

[0033] Figure 2 It is a structural schematic diagram of the heating mechanism.

[0034] Figure 3 yes Figure 2 Schematic diagram of the decomposition.

[0035] Figure 4 It is a schematic diagram of the structure of the heat conducting block.

[0036] Figure 5 It is a structural schematic diagram of the upper piston.

[0037] Figure 6 It is a schematic diagram of the combination of the lower piston, the brewing cylinder and the limit mechanism.

[0038] Figure 7 yes Figure 6 Schematic diagram of the decomposition.

[0039] Figure 8 yes Figure 6 Another exploded diagram of .

[0040] Fig. 9 yes Figure 6 Sectional view in .

[0041] Fig.10 It is a structural schematic diagram of the powder guiding mechanism.

[0042] Fig.11 It is a bottom view of the powder guiding mechanism.

[0043] Description of main component symbols:

[0044] 1. Framework;

[0045] 2. Upper piston; 21. Mounting chamber; 211. Limiting member; 22. Pressure relief valve; 23. Slot; 24. Latch;

[0046] 3. Lower piston;

[0047] 4. Brewing tank;

[0048] 5. Rotation axis;

[0049] 6. Heating mechanism; 61. Heat conducting block; 611. Limiting groove; 612. First through hole; 613. Through groove; 62. Heating block; 621. Second through hole; 63. Heater;

[0050] 7. Limiting mechanism; 71. Elastic buckle; 711. Limiting cavity; 712. Mounting seat; 7121. First mounting hole; 713. Spring piece; 714. First clamping protrusion; 72. Limiting buckle; 721. Second clamping protrusion; 73. Mounting piece; 731. Second mounting hole; 74. Fixing piece;

[0051] 8. Powder guiding mechanism; 81. Powder channel; 82. Baffle. DETAILED DESCRIPTION

[0052] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0057] Example 1

[0058] See Figure 1-11 As shown, the brewing device includes a frame 1, an upper piston 2, a lower piston 3, a brewing cylinder 4 and a rotating shaft 5. The upper piston 2, the lower piston 3, the brewing cylinder 4 and the rotating shaft 5 are respectively installed on the frame 1. When the lower piston 3 and the brewing cylinder 4 move upward to the lower piston 3 under the drive of the rotating shaft 5, a brewing cylinder for brewing coffee is formed between the upper piston 2, the lower piston 3 and the brewing cylinder 4. It also includes a heating mechanism 6. The top of the upper piston 2 is recessed downward to form a mounting cavity 21. The heating mechanism 6 is installed in the mounting cavity 21 to heat the upper piston 2 and transfer heat to the brewing cylinder. By setting the heating mechanism 6, the upper piston 2 is heated, and the upper piston 2 can also transfer part of the heat to the brewing cylinder, thereby increasing the temperature of the coffee liquid output by the brewing device, so that the brewed coffee has a normal temperature and a uniform taste. It is understandable that the heating mechanism 6 of the present invention can increase the temperature of the upper piston 2 and the brewing cylinder to avoid the upper piston 2 and the brewing cylinder being too low in temperature in cold winter, especially outdoors, which may affect the temperature of the coffee liquid.

[0059] like Figure 2-5 As shown, in a further specific embodiment, the heating mechanism 6 includes: a heat-conducting block 61, installed on the upper piston 2; a heating block 62, arranged above the upper piston 2, with its bottom in contact with the top of the heat-conducting block 61; a heater 63, installed on the heating block 62; the heater 63 is used to heat the heating block 62, and the heat-conducting block 61 is used to transfer the heat of the heating block 62 to the upper piston 2 and the brewing cylinder.

[0060] The heater 63 heats the heating block 62, and the heating block 62 transfers the heat to the heat-conducting block 61, and the heat-conducting block 61 transfers the heat to the brewing cylinder to heat the coffee liquid in the brewing cylinder, thereby increasing the temperature of the first cup of coffee, making the brewed coffee have a normal temperature and a uniform taste. It should be noted that the heater 63 of this embodiment uses a PTC heating element.

[0061] like Figure 2-5 As shown, in a further specific embodiment, at least one stopper 211 protrudes upward from the bottom of the installation cavity 21, and the bottom of the heat-conducting block 61 is recessed upward to form a stopper groove 611 corresponding to the stopper 211, and one stopper groove 611 is engaged with one stopper 211. Through the cooperation of the stopper groove 611 and the stopper 211, the position of the heat-conducting block 61 is limited to prevent the heat-conducting block 61 from rotating and deviating during use. It should be noted that the stopper 211 of this embodiment can also play a role in strengthening the strength of the upper piston 2.

[0062] As a preferred embodiment, the number of the limiting members 211 in this embodiment is four, the number of the limiting grooves 611 is four, the four limiting members 211 are respectively engaged with the four limiting grooves 611, and the four limiting grooves 611 are equidistantly arranged around the bottom of the heat conductive block 61.

[0063] In other specific embodiments, the number of the limiting members 211 may be two or three or more, the number of the limiting grooves 611 corresponds to the number of the limiting members 211 , and the limiting grooves 611 are equidistantly arranged around the bottom of the heat conducting block 61 .

[0064] It should be noted that a plurality of stoppers 211 are also arranged around the bottom of the mounting cavity 21 at equal distances, which can further increase the strength of the upper piston 2 .

[0065] like Figure 2-5 As shown, in a further specific embodiment, a pressure relief valve 22 for passing coffee liquid is installed in the installation cavity 21, a first through hole 612 for installing the pressure relief valve 22 is opened in the middle of the heat conductive block 61, the input end of the pressure relief valve 22 is connected to the output end of the brewing cylinder, the output end of the pressure relief valve 22 is provided with a liquid outlet pipe, and a second through hole 621 for passing the liquid outlet pipe is opened in the middle of the heating block 62.

[0066] The first through hole 612 is provided so that the pressure relief valve 22 can pass through the heat conductive block 61 smoothly, thereby preventing the heat conductive block 61 from affecting the installation of the pressure relief valve 22. The size of the first through hole 612 is set so that the heat conductive block 61 fits the pressure relief valve 22 through the first through hole 612, thereby increasing the temperature of the pressure relief valve 22 and further ensuring the stability of the taste of the first cup of coffee. The second through hole 621 is provided so that the liquid outlet pipe can pass through the heating block 62 smoothly, thereby preventing the heating block 62 from affecting the installation of the liquid outlet pipe.

[0067] like Figure 2-5As shown, in a further specific embodiment, the side wall of the upper piston 2 is provided with a slot 23 penetrating the upper piston 2, a latch 24 is arranged in the slot 23, the heat conducting block 61 is provided with a through slot 613, and the latch 24 passes through the through slot 613 and the slot 23 and penetrates the heat conducting block 61 and the upper piston 2 respectively. Through the provision of the through slot 613, the latch 24 can limit the heat conducting block 61 after being inserted into the heat conducting block 61, so as to avoid the heat conducting block 61 from rotating and deviating during use.

[0068] like Figure 6-9 As shown, in a further specific embodiment, a limiting mechanism 7 is also included, and the limiting mechanism 7 includes: an elastic buckle 71, which is installed on the lower piston 3 and has a limiting cavity 711 in the middle; a limiting buckle 72, the bottom of which is installed on the bottom of the frame 1, and the top extends into the limiting cavity 711 and is engaged with the elastic buckle 71; wherein the elastic buckle 71 includes a mounting seat 712 and at least two spring pieces 713, the mounting seat 712 is connected to the lower piston 3, at least two spring pieces 712 are respectively installed on the mounting seat 712, and there is a gap between two adjacent spring pieces 712. Through the cooperation of the elastic buckle 71 and the limiting buckle 72, the speed of movement of the lower piston 3 is less than the speed of movement of the brewing cylinder 4, thereby achieving the reduction of the volume of the brewing chamber and the formation of coffee powder cakes, the structure is simple, and the production cost is reduced compared with the prior art.

[0069] like Figure 6-9 As shown, in a further specific embodiment, the inner side of the elastic sheet 712 protrudes toward the axial position of the mounting seat 712 to form a first clamping protrusion 714 for limiting the position of the limit pull buckle 72, and the outer side of the limit pull buckle 72 protrudes outward to form a second clamping protrusion 721 that cooperates with the first clamping protrusion 714. When the elastic buckle 71 moves up and down on the limit pull buckle 72, the friction between the two is increased by the setting of the first clamping protrusion 714. The outer side of the limit pull buckle 72 protrudes outward to form a second clamping protrusion 721 that cooperates with the first clamping protrusion 714. In cooperation with the second clamping protrusion 721, the moving speed of the lower piston 3 is limited, thereby achieving coffee brewing.

[0070] like Figure 6-9As shown, in a further specific embodiment, the limiting mechanism 7 further includes a mounting member 73 and a fixing member 74. The mounting member 73 extends through the mounting seat 712 into the lower piston 3. By setting the mounting member 73, the mounting seat 712 is installed in the lower piston 3, which has a simple structure and strong stability. The mounting seat 712 has a first mounting hole 7121, and the mounting member 73 has a second mounting hole 731. When the mounting member 73 extends into the second mounting groove, the first mounting hole 7121 coincides with the second mounting hole 731, and the fixing member 74 fixes the mounting member 73 in the mounting seat 712 through the first mounting hole 7121 and the second mounting hole 731. It should be noted that the fixing member 74 of this embodiment is a screw, and the mounting member 73 is fixed in the mounting seat 712 by the screw, so that the mounting seat 712 is fixed on the lower piston 3.

[0071] like Figure 10-11 As shown, in a further specific embodiment, a powder guiding mechanism 8 is also included, and the powder guiding mechanism 8 includes: a powder channel 81, which has a "U"-shaped cross-section and is respectively installed on the inner sides of the two frames 1; a baffle 82, which is installed at the bottom of the powder channel 81, and the width of the baffle 82 is greater than or equal to the depth of the powder channel 81; when the brewing cylinder 4 moves upward to the powder adding position, the bottom of the powder channel 81 is toward the center position of the brewing cylinder 4.

[0072] By setting the baffle 82, the powder blocking area is increased, so as to prevent the coffee powder from bypassing the baffle 82 and adhering to the powder channel 81 and the outer side of the baffle 82 under the action of static electricity, and to prevent the amount of coffee powder in the brewing cylinder 4 from being reduced, so that the concentration of the coffee is guaranteed. As a preferred embodiment, the width of the baffle 82 of this embodiment is greater than the depth of the powder channel 81. In this way, part of the coffee powder can only adhere to the inner side of the baffle 82 under the action of static electricity, and fall into the brewing cylinder 4 under accumulation, thereby ensuring the amount of coffee powder in the brewing cylinder 4. It should be noted that the center position of the brewing cylinder 4 referred to in this embodiment is the center position of the top of the brewing cylinder 4, at which position the coffee powder can just accumulate in the middle of the brewing cylinder 4, so that more coffee powder can be carried. There will be a certain gap between the coffee powder after it enters the brewing cylinder 4. When a specified amount of coffee powder enters the brewing cylinder 4, the coffee powder in the middle will exceed and be exposed at the top of the brewing cylinder 4. When the brewing cylinder 4 and the lower piston 3 continue to move upward to form a brewing chamber with the upper piston 2, the upper piston 2 will press the coffee powder downward, so that more coffee powder can be carried.

[0073] Example 2

[0074] See Figure 1-11 As shown, the coffee machine includes a brewing device. The coffee machine of this embodiment includes all the technical features and technical effects of embodiment 1, so they are not described in detail.

[0075] Descriptions such as "specific examples" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are contradictory.

[0076] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above embodiments. As long as they conform to the purpose of the present invention, they shall be within the scope of protection required by the present invention, such as different combinations of specific embodiments and different combinations of distinguishing technical features.

Claims

1. A brewing device, comprising a frame (1), an upper piston (2), a lower piston (3), a brewing cylinder (4) and a rotating shaft (5), wherein the upper piston (2), the lower piston (3), the brewing cylinder (4) and the rotating shaft (5) are respectively mounted on the frame (1), and when the lower piston (3) and the brewing cylinder (4) are driven by the rotating shaft (5) to move upward to the lower piston (3), a brewing cylinder for brewing coffee is formed between the upper piston (2), the lower piston (3) and the brewing cylinder (4), characterized in that: It also includes a heating mechanism (6), the top of the upper piston (2) is recessed downward to form a mounting cavity (21), and the heating mechanism (6) is mounted in the mounting cavity (21) and is used to heat the upper piston (2) and transfer heat to the brewing cylinder.

2. A brewing device according to claim 1, characterized in that: The heating mechanism (6) comprises: A heat conducting block (61) is mounted on the upper piston (2); A heating block (62) is arranged above the upper piston (2), and its bottom is in contact with the top of the heat-conducting block (61); A heater (63) mounted on the heating block (62); The heater (63) is used to heat the heating block (62), and the heat-conducting block (61) is used to transfer the heat of the heating block (62) to the upper piston (2) and the brewing cylinder.

3. A brewing device according to claim 2, characterized in that: At least one limiting member (211) protrudes upward from the bottom of the installation cavity (21), and the bottom of the heat conducting block (61) is recessed upward to form limiting grooves (611) of a number corresponding to the limiting members (211), and one limiting groove (611) is snap-connected with one limiting member (211).

4. A brewing device according to claim 2, characterized in that: A pressure relief valve (22) for passing coffee liquid is installed in the installation cavity (21), a first through hole (612) for installing the pressure relief valve (22) is opened in the middle of the heat conductive block (61), an input end of the pressure relief valve (22) is connected to an output end of the brewing cylinder, a liquid outlet pipe is arranged at the output end of the pressure relief valve (22), and a second through hole (621) for passing the liquid outlet pipe is opened in the middle of the heating block (62).

5. A brewing device according to claim 2, characterized in that: The side wall of the upper piston (2) is provided with a slot (23) penetrating the upper piston (2); a latch (24) is arranged in the slot (23); the heat conducting block (61) is provided with a through slot (613); the latch (24) passes through the through slot (613) and the slot (23) to penetrate the heat conducting block (61) and the upper piston (2) respectively.

6. A brewing device according to claim 1, characterized in that: It also includes a limiting mechanism (7), wherein the limiting mechanism (7) includes: An elastic buckle (71) is mounted on the lower piston (3) and has a limiting cavity (711) in the middle; A limiting buckle (72), the bottom of which is mounted on the bottom of the frame (1), and the top of which extends into the limiting cavity (711) and is engaged with the elastic buckle (71); The elastic buckle (71) comprises a mounting seat (712) and at least two spring sheets (713); the mounting seat (712) is connected to the lower piston (3); at least two spring sheets (713) are respectively mounted on the mounting seat (712); and there is a gap between two adjacent spring sheets (713).

7. A brewing device according to claim 6, characterized in that: The inner side of the elastic sheet (713) protrudes toward the axial position of the mounting seat (712) to form a first locking protrusion (714) for limiting the limiting buckle (72), and the outer side of the limiting buckle (72) protrudes outward to form a second locking protrusion (721) that matches the first locking protrusion (714).

8. A brewing device according to claim 6, characterized in that: The limiting mechanism (7) further comprises a mounting member (73) and a fixing member (74); the mounting member (73) extends through the mounting seat (712) into the lower piston (3); the mounting seat (712) is provided with a first mounting hole (7121); the mounting member (73) is provided with a second mounting hole (731); when the mounting member (73) extends into the second mounting groove, the first mounting hole (7121) coincides with the second mounting hole (731); the fixing member (74) fixes the mounting member (73) in the mounting seat (712) via the first mounting hole (7121) and the second mounting hole (731).

9. The brewing device according to claim 1, characterized in that: It also includes a powder guiding mechanism (8), the powder guiding mechanism (8) including: a powder channel (81) having a "U"-shaped cross section, with two sides respectively installed on the inner sides of the two frames (1); a baffle (82) installed at the bottom of the powder channel (81), wherein the width of the baffle (82) is greater than or equal to the depth of the powder channel (81); When the brewing cylinder (4) moves upward to the powder adding position, the bottom of the powder channel (81) faces the center position of the brewing cylinder (4).

10. A coffee machine, characterized in that: A brewing device comprising any one of claims 1-9.

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