Coffee extraction structure and coffee machine

Abstract

The utility model relates to a coffee extraction structure and a coffee machine, which comprise a brewing plug assembly, the brewing plug assembly comprises a support and a brewing plug arranged on the support, the brewing plug can move along the axis direction of the brewing plug, the brewing plug assembly further comprises a screw rod arranged along the axis direction of the brewing plug, and the screw rod is arranged on the support. The first end of the screw rod is connected with the brewing plug, the second end of the screw rod is linked with a driving mechanism used for driving the screw rod to rotate around the axis of the screw rod, the screw rod is in threaded connection with a nut, and the nut is limited in the axis direction of the brewing plug. Compared with the prior art, when coffee is extracted, the brewing plug moves downwards to press powder, meanwhile, coffee powder in the brewing cavity can be flattened through rotation of the brewing plug, and the situation that the extraction effect is affected due to uneven distribution of the coffee powder is avoided.

Description

Technical Field

[0001] This utility model relates to the field of coffee machines, and in particular to a coffee extraction structure and a coffee machine. Background Technology

[0002] The extraction mechanism is a crucial component of a coffee machine, used to brew coffee. It typically involves the brewing stopper of the brewing plug assembly pressing against the piston of the brewer, thus compressing the coffee grounds and extracting the coffee. Existing technologies generally use the linear motion of the brewing stopper to compress the coffee grounds, after which hot water is applied for extraction. For example, Chinese invention patent ZL 201810886939.0 (authorization announcement number CN109124354B) discloses a coffee extraction device, including: a cylinder; a first piston extending into the cylinder along a first horizontal direction to compress the coffee grounds in the cylinder; a second piston extending into the cylinder along a second horizontal direction opposite to the first horizontal direction to eject the extracted coffee grounds from the cylinder; and a liquid supply mechanism connected to the cylinder to supply extraction liquid to the cylinder.

[0003] However, when the coffee grounds are unevenly distributed in the brewing chamber, the thickness of the tamped coffee grounds will also be inconsistent, affecting the coffee extraction effect. In addition, existing brewing stopper assemblies have many parts, making assembly troublesome. Parts are easily lost during the assembly process, and if the internal structure of the assembled brewing stopper assembly is not solid, it can easily affect the coffee extraction effect. Summary of the Invention

[0004] The first technical problem this invention aims to solve is to provide a coffee extraction structure that avoids uneven coffee powder distribution during extraction, in contrast to existing technologies.

[0005] The second technical problem to be solved by this utility model is to provide a coffee extraction structure with a robust internal structure and convenient assembly, which is in contrast to the prior art.

[0006] The third technical problem to be solved by this utility model is to provide a coffee machine with the above-mentioned coffee extraction structure, in contrast to the prior art.

[0007] The technical solution adopted by this utility model to solve at least one of the above-mentioned technical problems is as follows: a coffee extraction structure, including a brewing plug assembly, which includes a support and a brewing plug mounted on the support. The brewing plug is movable along its own axis. The brewing plug assembly is characterized in that the brewing plug assembly further includes a screw arranged along the axis of the brewing plug. The first end of the screw is connected to the brewing plug and the second end is linked to a drive mechanism for driving the screw to rotate around its own axis. A nut is threadedly connected to the screw, and the nut is limited along the axis of the brewing plug.

[0008] Furthermore, the drive mechanism includes a drive motor, a first transmission gear, and a second transmission gear. The output shaft of the drive motor has an external thread along its length on its outer surface. The second transmission gear is coaxially mounted with the screw, and the second end of the screw is fixed to the hub of the second transmission gear. The first transmission gear is a double gear comprising a first gear and a second gear. The first gear meshes with the external thread, and the second gear meshes with the second transmission gear. Thus, when the drive motor operates, it drives the first transmission gear to rotate via the external thread, thereby transmitting power to the second transmission gear. The second transmission gear then drives the screw to rotate, thus rotating the bubble stopper.

[0009] Furthermore, the brewing stopper and the aforementioned screw are integrated into one piece. This not only simplifies the internal structure of the coffee extraction mechanism but also ensures that the brewing stopper reliably moves synchronously with the screw.

[0010] Furthermore, the brewing plug is integrally formed at the end of the first end of the screw. This makes the structure of the brewing plug and the screw more compact, and better realizes the linear movement and rotation of the brewing plug.

[0011] Furthermore, the second transmission gear and the screw are integrated into one piece. This not only simplifies the internal structure of the coffee extraction mechanism but also ensures that the second transmission gear reliably drives the screw to rotate.

[0012] Furthermore, it also includes a rotating shaft, on which the second transmission gear is mounted and can rotate. The second end of the screw is hollow and open, and its end is circumferentially fixed to the hub of the second transmission gear. The rotating shaft passes through the second end. This design allows for a stable integrated structure between the second transmission gear and the screw, and also ensures a stable mounting of the rotating shaft, enabling the second transmission gear to rotate stably around the shaft.

[0013] Furthermore, it also includes a motor mount for mounting the aforementioned drive motor, a gear mount for mounting the aforementioned first transmission gear, and a shaft mount for mounting the aforementioned rotating shaft.

[0014] The motor housing includes a first base and a second base, which are detachably connected. The gear housing includes a third base and a fourth base, which are connected by fasteners. The first base of the motor housing, the third base of the gear housing, and the shaft seat are integral parts, as are the second base of the motor housing and the fourth base of the gear housing. This design achieves stable installation of the drive motor, the first transmission gear, and the rotating shaft. Furthermore, by integrating the first base of the motor housing, the third base of the gear housing, and the shaft seat into a single unit, and integrating the second base of the motor housing and the fourth base of the gear housing into a single unit, the internal structure of the coffee extraction mechanism is simplified, facilitating assembly and preventing component loss, while also enhancing structural robustness.

[0015] Furthermore, the motor mount is cylindrical to allow the drive motor to be axially mounted. Both the first and second mounts are semi-cylindrical, and they are joined together to form the motor mount, with the joints connected by snap-fit ​​components. This facilitates a stable installation of the drive motor on the motor mount and also makes it easy to assemble and disassemble the drive motor from the motor mount.

[0016] Furthermore, the gear seat is in the shape of a cover, arranged along the axis of the first transmission gear and opening towards the second transmission gear to allow the second gear to mesh with it. The third seat is the end wall of one end of the gear seat along its length and is located on the same side as the first seat. The fourth seat is the remaining part of the gear seat excluding the third seat and is located on the same side as the second seat. Both the inner surfaces of the third and fourth seats have protruding frustums, and the first transmission gear rotates around each frustum. This ensures the stable installation and smooth rotation of the first transmission gear within the gear seat, facilitates the assembly and disassembly of the first transmission gear and the gear seat, and allows the third and first seats to be integrated as a single unit, as well as the fourth and second seats to be integrated as a single unit.

[0017] Furthermore, the first and second seats are respectively sealed at the ends where the output shaft of the drive motor is located to form a first end wall and a second end wall. The first end wall and the second end wall are assembled to form the seat end wall of the motor seat, and each end wall extends outward along the length direction of the output shaft at the center of the seat end wall, and is assembled to form a shaft chamber for accommodating the output shaft. The shaft chamber communicates with the gear seat so that the external thread can mesh with the first gear.

[0018] The portion of the aforementioned shaft chamber extending outward from the first end wall is integrally formed on the aforementioned third seat. The port edge of the open end of the fourth seat extends circumferentially outward to form a cover edge. The direction of this cover edge is perpendicular to the axial direction of the first transmission gear, and the cover edge is fastened to the aforementioned third seat along the axial direction of the first transmission gear by fasteners. The portion of the aforementioned shaft chamber extending outward from the second end wall is integrally formed on the aforementioned cover edge. This design allows the first and third seats, and the second and fourth seats, to better form an integrated structure. Furthermore, it allows for a more stable connection between the third and fourth seats to form a gear seat, while preventing the output shaft of the drive motor from being exposed to the outside and corroded by the humid working environment, thus extending the service life of the drive motor.

[0019] Furthermore, the bearing seat is flat and its orientation is perpendicular to the extension direction of the aforementioned rotating shaft. One side of the bearing seat is integrally mounted on the aforementioned third seat along its length, while the aforementioned rotating shaft is integrally mounted in the middle of the bearing seat. This simplifies the structure of the bearing seat and facilitates its integration with the third seat. Furthermore, the rotating shaft, the first seat, the third seat, and the bearing seat are all integral components, which not only simplifies the internal structure of the coffee extraction mechanism but also improves the compactness and overall integration of the brewing stopper assembly through the insertion of the rotating shaft into the screw.

[0020] Furthermore, the nut is formed by a square block with a central hole and internal threads. The bracket has a channel through which the screw passes and a receiving cavity matching the size of the nut. One side of the nut extends outwards along its length, and a corresponding hole is formed in the wall of the receiving cavity to allow the extended portion of the nut to engage. This not only ensures the nut's stable placement on the bracket but also limits its movement along the axis of the bubble stopper. The square design also improves the reliability of this limiting action.

[0021] The technical solution adopted to further solve the third technical problem mentioned above is: a coffee machine, characterized in that it includes the coffee extraction structure described above.

[0022] Compared with existing technologies, the advantages of this invention are as follows: a nut is threaded onto the screw, and this nut is limited along the axial direction of the brewing stopper. Thus, when the drive mechanism drives the screw to rotate around its own axis, the screw can simultaneously move linearly relative to the nut, thereby achieving synchronous rotation of the brewing stopper with the screw while it moves along its own axial direction. During coffee extraction, as the brewing stopper moves down to tamp the coffee grounds, it can also rotate itself to rotate the coffee grounds simultaneously, thus leveling the coffee grounds in the brewing chamber and preventing uneven distribution that could affect the extraction effect. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the coffee extraction structure in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A structural diagram from another direction;

[0025] Figure 3 for Figure 2 A cross-sectional view along the BB direction;

[0026] Figure 4 for Figure 3 Enlarged view of section C;

[0027] Figure 5 for Figure 1 A cross-sectional view along the AA direction;

[0028] Figure 6 This is a schematic diagram of the brewing plug assembly in an embodiment of the present invention;

[0029] Figure 7 This is an exploded view of the brewing plug assembly in an embodiment of the present invention;

[0030] Figure 8 for Figure 7 A structural diagram in another direction. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0033] A coffee machine, including such Figures 1-8The coffee extraction structure shown includes a brewer 1 and a brewing stopper assembly 2. The brewer 1 includes a brewing cup 11 and a piston 12 disposed within the brewing cup 11. The brewing stopper assembly 2 includes a support 22 and a brewing stopper 21 mounted on the support 22. The brewing stopper 21 is movable along its own axis. Figure 1 and Figure 3 As shown.

[0034] Furthermore, such as Figure 3 As shown, the brewing stopper assembly 2 also includes a screw 3 arranged along the axial direction of the brewing stopper 21. The first end of the screw 3 is connected to the brewing stopper 21, and the second end is linked to a drive mechanism 4 for driving the screw 3 to rotate around its own axis. A nut 9 is threaded onto the screw 3, and the nut 9 is limited along the axial direction of the brewing stopper 21. Therefore, in this invention, the screw 3 is threaded with a nut 9, and the nut 9 is limited along the axial direction of the brewing stopper 21. Thus, when the drive mechanism 4 drives the screw 3 to rotate around its own axis, the screw 3 can simultaneously move linearly relative to the nut 9, thereby achieving synchronous rotation of the brewing stopper 21 with the screw 3 while moving along its own axial direction. In this way, during coffee extraction, the brewing stopper 21 moves down to press the coffee powder, and at the same time, its rotation can level the coffee powder in the brewing chamber 10, preventing uneven distribution of coffee powder (e.g., different heights) from affecting the extraction effect.

[0035] Furthermore, such as Figure 4 As shown, the drive mechanism 4 includes a drive motor 41, a first transmission gear 42, and a second transmission gear 43. The output shaft 411 of the drive motor 41 has an external thread 4111 along its length on its outer surface. The second transmission gear 43 is coaxially mounted with the screw 3, and the second end of the screw 3 is fixed to the hub of the second transmission gear 43. The first transmission gear 42 is a double gear comprising a first gear 421 and a second gear 422. The first gear 421 meshes with the external thread 4111, while the second gear 422 meshes with the second transmission gear 43. When the drive motor 41 operates, it drives the first transmission gear 42 to rotate via the external thread 4111, thereby transmitting power to the second transmission gear 43. The second transmission gear 43 then drives the screw 3 to rotate, thus rotating the bubble stopper 21.

[0036] Preferably, the brewing stopper 21 and the screw 3 are integrally formed, which not only simplifies the internal structure of the coffee extraction mechanism but also ensures that the brewing stopper 21 reliably moves synchronously with the screw 3. More preferably, the brewing stopper 21 is integrally formed at the end of the first end of the screw 3 (e.g., ...). Figure 3 As shown in the figure, this makes the structure of the brewing plug 21 and the screw 3 more compact, and better realizes the linear movement and rotation of the brewing plug 21.

[0037] Preferably, the second transmission gear 43 and the screw 3 are integrally formed, which not only simplifies the internal structure of the coffee extraction structure but also ensures that the second transmission gear 43 reliably drives the screw 3 to rotate. Furthermore, a rotating shaft 5 is included, on which the second transmission gear 43 is mounted and can rotate. The second end of the screw 3 is hollow and open, and its end is circumferentially fixed to the hub of the second transmission gear 43. The rotating shaft 5 passes through this second end (e.g., ...). Figure 3 (As shown). On the one hand, it enables the second transmission gear 43 and the screw 3 to form a stable integrated structure. On the other hand, it enables the shaft 5 to be stably set and allows the second transmission gear 43 to rotate stably around the shaft 5.

[0038] Furthermore, such as Figure 6 As shown, it also includes a motor mount 6 for mounting the drive motor 41, a gear mount 7 for mounting the first transmission gear 42, and a shaft mount 8 for mounting the rotating shaft 5. Wherein, as... Figure 7 and Figure 8 As shown, the motor mount 6 includes a first mount 61 and a second mount 62, which are detachably connected. The gear mount 7 includes a third mount 71 and a fourth mount 72, which are connected by fasteners (not shown). The first mount 61 of the motor mount 6, the third mount 71 of the gear mount 7, and the shaft seat 8 are integral parts, while the second mount 62 of the motor mount 6 and the fourth mount 72 of the gear mount 7 are integral parts. This design ensures the stable installation of the drive motor 41, the first transmission gear 42, and the rotating shaft 5. By integrating the first mount 61 of the motor mount 6, the third mount 71 of the gear mount 7, and the shaft seat 8 into one integral part (denoted as part 20A), and integrating the second mount 62 of the motor mount 6 and the fourth mount 72 of the gear mount 7 into one integral part (denoted as part 20B), the internal structure of the coffee extraction structure is simplified, easier to assemble, and less prone to component loss. Furthermore, the structure is made more robust.

[0039] like Figure 6 As shown, the motor mount 6 is cylindrical to accommodate the drive motor 41 axially. Both the first mount 61 and the second mount 62 are semi-cylindrical, and they are joined together to form the motor mount 6. The joints of the two mounts are connected by snap-fit ​​components 63. This facilitates the stable installation of the drive motor 41 on the motor mount 6 and also makes it convenient to assemble and disassemble the drive motor 41 from the motor mount 6.

[0040] like Figure 4As shown, the gear seat 7 is in the shape of a cover, arranged along the axis of the first transmission gear 42 and opening towards the second transmission gear 43, so that the second gear 422 meshes with the second transmission gear 43. The third seat 71 is the end wall of one end of the gear seat 7 along its own length and is located on the same side as the first seat 61. The fourth seat 72 is the rest of the gear seat 7 excluding the third seat 71 and is located on the same side as the second seat 62. A frustum 74 is protruded from the inner surface of the third seat 71 and the inner surface of the fourth seat 72, respectively. The first transmission gear 42 rotates around each frustum 74. This allows for the stable installation and smooth rotation of the first transmission gear 42 in the gear seat 7, facilitates the assembly and disassembly of the first transmission gear 42 from the gear seat 7, and makes it easier for the third seat 71 and the first seat 61 to form a single unit, and for the fourth seat 72 and the second seat 62 to form a single unit.

[0041] like Figure 4 As shown, the first seat 61 and the second seat 62 are respectively sealed at the end where the output shaft 411 of the drive motor 41 is located to form a first end wall 611 and a second end wall 621. The first end wall 611 and the second end wall 621 are assembled to form the seat end wall 64 of the motor seat 6, and extend outward along the length direction of the output shaft 411 at the center of the seat end wall 64, and are assembled (and fixed by fasteners) to form a shaft chamber 65 for accommodating the output shaft 411. The shaft chamber 65 communicates with the gear seat 7 so that the external thread 4111 can mesh with the first gear 421. The portion of the shaft chamber 65 extending outward from the first end wall 611 (denoted as the first portion 6111) is integrally provided on the third seat 71. The port edge of the opening end of the fourth seat 72 extends outward circumferentially to form a cover edge 73. The direction of the cover edge 73 is perpendicular to the axial direction of the first transmission gear 42, and the cover edge 73 is fastened to the third seat 71 along the axial direction of the first transmission gear 42 by fasteners. The portion of the shaft chamber 65 extending outward from the second end wall 621 (denoted as the first portion 6211) is integrally provided on the cover edge 73. This design allows the first seat 61 and the third seat 71, and the second seat 62 and the fourth seat 72 to form a better integrated structure. It also allows the third seat 71 and the fourth seat 72 to be more securely connected to form the gear seat 7. Furthermore, it prevents the output shaft 411 of the drive motor 41 from being exposed to the humid working environment and thus extends the service life of the drive motor 41.

[0042] like Figure 7 and Figure 8As shown, the aforementioned bearing seat 8 is flat and its orientation is perpendicular to the extension direction of the aforementioned rotating shaft 5. One side of the bearing seat 8 is integrally mounted on the aforementioned third seat 71 along its length, while the aforementioned rotating shaft 5 is integrally mounted in the middle of the bearing seat 8. This simplifies the structure of the bearing seat 8 and facilitates the formation of an integral structure between the bearing seat 8 and the third seat 71. Furthermore, the fact that the rotating shaft 5, the first seat 61, the third seat 71, and the bearing seat 8 are all integral components not only makes the internal structure of the coffee extraction structure more concise but also improves the compactness and overall integration of the brewing stopper assembly 2 through the insertion of the rotating shaft 5 into the screw 3.

[0043] like Figure 1 and Figure 5 As shown, the nut 9 is formed by a square block with a central hole and an internal thread 91. The bracket 22 has a channel 221 through which the screw 3 passes, and a receiving cavity 222 matching the size of the nut 9. One side of the nut 9 extends outward along its length, and a corresponding hole (i.e., a limiting hole 223) is opened in the cavity wall of the receiving cavity 222. The receiving cavity 222 itself can limit the nut 9, and by opening the limiting hole 223, a double-layer limiting of the nut 9 can be achieved, improving the reliability of the limiting) for the extension of the nut 9 to be inserted. This not only ensures the stable placement of the nut 9 on the bracket 22, but also limits the nut 9 along the axial direction of the bubble stopper 21, and the square design helps to improve the reliability of the limiting.

Claims

1. A coffee extraction structure comprising a brewing plug assembly (2) including a support (22) and a brewing plug (21) mounted on the support (22), the brewing plug (21) being movable along its own axis, characterized in that, The brewing plug assembly (2) further includes a screw (3) arranged along the axial direction of the brewing plug (21). The first end of the screw (3) is connected to the brewing plug (21), and the second end is linked to a drive mechanism (4) for driving the screw (3) to rotate around its own axis. A nut (9) is threaded onto the screw (3), and the nut (9) is limited along the axial direction of the brewing plug (21).

2. The coffee extraction structure as described in claim 1, characterized in that, The drive mechanism (4) includes a drive motor (41), a first transmission gear (42), and a second transmission gear (43). The output shaft (411) of the drive motor (41) has an external thread (4111) along its length on its outer surface. The second transmission gear (43) is coaxially arranged with the screw (3), and the end of the second end of the screw (3) is fixed on the hub of the second transmission gear (43). The first transmission gear (42) is a double gear and includes a first gear (421) and a second gear (422). The first gear (421) meshes with the external thread (4111), and the second gear (422) meshes with the second transmission gear (43).

3. The coffee extraction structure as described in claim 1 or 2, characterized in that, The brewing plug (21) and the screw (3) are an integral part.

4. The coffee extraction structure as described in claim 3, characterized in that, The brewing plug (21) is integrally formed at the end of the first end of the screw (3).

5. The coffee extraction structure as described in claim 2, characterized in that, The second transmission gear (43) and the screw (3) are an integral part.

6. The coffee extraction structure as described in claim 5, characterized in that, It also includes a rotating shaft (5), on which the second transmission gear (43) is mounted and can rotate around the rotating shaft (5), and the second end of the screw (3) is hollow and open at the end, and the end of the second end is fixed circumferentially on the hub of the second transmission gear (43), and the rotating shaft (5) passes through the second end.

7. The coffee extraction structure as described in claim 6, characterized in that, It also includes a motor mount (6) for mounting the drive motor (41), a gear mount (7) for mounting the first transmission gear (42), and a shaft mount (8) for mounting the shaft (5). The motor mount (6) includes a first mount (61) and a second mount (62), which are detachably connected. The gear mount (7) includes a third mount (71) and a fourth mount (72), which are connected by fasteners. The first mount (61) of the motor mount (6), the third mount (71) of the gear mount (7) and the shaft mount (8) are integral parts, while the second mount (62) of the motor mount (6) and the fourth mount (72) of the gear mount (7) are integral parts.

8. The coffee extraction structure as described in claim 7, characterized in that, The motor base (6) is cylindrical for the drive motor (41) to be axially mounted. The first base (61) and the second base (62) are both semi-cylindrical and are assembled into the motor base (6). The joints of the two are connected by snap-fit ​​components (63).

9. The coffee extraction structure as described in claim 7, characterized in that, The gear seat (7) is in the shape of a cover. It is arranged along the axial direction of the first transmission gear (42) and opens towards the second transmission gear (43) so that the second gear (422) meshes with the second transmission gear (43). The third seat (71) is the end wall of one end of the gear seat (7) along its own length direction and is located on the same side as the first seat (61). The fourth seat (72) is the rest of the gear seat (7) except for the third seat (71) and is located on the same side as the second seat (62). The inner surface of the third seat (71) and the inner surface of the fourth seat (72) are respectively provided with frustums (74). The first transmission gear (42) rotates around each frustum (74).

10. The coffee extraction structure as described in claim 8, characterized in that, The first seat (61) and the second seat (62) are respectively sealed at the end where the output shaft (411) of the drive motor (41) is located to form a first end wall (611) and a second end wall (621). The first end wall (611) and the second end wall (621) are assembled to form the seat end wall (64) of the motor seat (6). The seat end wall (64) extends outward along the length direction of the output shaft (411) at the center of the seat end wall (64) and is assembled to form a shaft chamber (65) for accommodating the output shaft (411). The shaft chamber (65) communicates with the gear seat (7) so that the external thread (4111) can mesh with the first gear (421). The portion of the shaft chamber (65) extending outward from the first end wall (611) is integrally provided on the third seat (71), and the port edge of the opening end of the fourth seat (72) extends outward in the circumferential direction to form a cover edge (73). The setting direction of the cover edge (73) is perpendicular to the axial direction of the first transmission gear (42), and the cover edge (73) is fastened to the third seat (71) along the axial direction of the first transmission gear (42) and fixed by fasteners. The portion of the shaft chamber (65) extending outward from the second end wall (621) is integrally provided on the cover edge (73).

11. The coffee extraction structure as described in claim 7, characterized in that, The bearing seat (8) is flat and its orientation is perpendicular to the extension direction of the shaft (5). One side of the bearing seat (8) is integrally disposed on the third seat (71) along the length direction, and the shaft (5) is integrally disposed in the middle of the bearing seat (8).

12. The coffee extraction structure as described in claim 1, characterized in that, The nut (9) is formed by a square block with a central hole and an internal thread (91). The bracket (22) has a channel (221) through which the screw (3) passes, and a receiving cavity (222) matching the size of the nut (9). One side of the nut (9) extends outward along the length direction, and the corresponding part of the cavity wall of the receiving cavity (222) has a hole for the extension of the nut (9) to be inserted.

13. A coffee machine, characterized in that, Includes the coffee extraction structure as described in any one of claims 1 to 12.

Images