Piston pump mechanism with organ seal and coffee machine thereof

Abstract

The utility model discloses an organ sealed powder pressing mechanism and coffee machine thereof, including shell and the powder pressing cylinder of being established in the shell and can move up and down, the inner tube that is fixed with the powder pressing cylinder is also established in the shell, the inner tube is connected with and is equipped with drive arrangement, drive arrangement drives the powder pressing cylinder and moves up and down, the powder pressing cylinder is from below and is set in the outer side of the inner tube, and moves up and down along the lateral surface of the inner tube, the telescopic annular sealing element is established between the shell and the powder pressing cylinder, the sealing element has the stretch state of the cylinder sample of elongation and contracts as the folding state of organ, the upper end of sealing element is fixed between the inner tube and the shell, the lower end of sealing element is around in the outer side of the powder pressing cylinder, and with the powder pressing cylinder sealed connection.

Description

Technical Field

[0001] This utility model belongs to the field of coffee machine technology, specifically relating to an accordion-sealed tamping mechanism and its coffee machine. Background Technology

[0002] Modern coffee machines automate the entire coffee brewing process, from grinding and tamping to filling, brewing, and grounds removal, achieving convenience, speed, consistent quality, and high efficiency. During tamping, the sealing structure of the tamping device is a crucial component ensuring coffee extraction quality, operational stability, and equipment safety. In high-pressure extraction processes (such as espresso), the coffee grounds must be evenly compacted to form a stable puck structure. Insufficient sealing can cause high-pressure water to leak from the edges, resulting in insufficient extraction pressure, abnormal coffee flow rate, and ultimately affecting the aroma, body, and flavor balance of the coffee.

[0003] The sealing structure of the existing coffee machine tamping mechanism generally adopts a fixed annular sealing ring, which is interference-fitted to the cylinder wall to achieve its sealing performance. However, this structure is prone to problems such as large friction between the sealing ring and its adjacent side wall, affecting the smoothness of rotation and movement. Moreover, during the tamping process, coffee powder on the cylinder wall can enter the screw or gears and other components inside, affecting the operation of the equipment. Summary of the Invention

[0004] To address the problems in related technologies, this utility model proposes an accordion-sealed tamping mechanism and its coffee machine. It utilizes a deformable accordion-sealed structure to prevent coffee powder from entering the tamping cylinder and affecting its internal interlocking or connection.

[0005] This utility model is implemented as follows:

[0006] A bellows-sealed powder pressing mechanism includes a housing and a powder pressing cylinder that can move up and down inside the housing. An inner cylinder adapted to the powder pressing cylinder is also fixed inside the housing. The inner cylinder is connected to and equipped with a driving device, which drives the powder pressing cylinder to move up and down.

[0007] The powder pressing cylinder is fitted onto the outside of the inner cylinder from below and moves up and down along the outer side of the inner cylinder;

[0008] A retractable annular seal is provided between the shell and the powder pressing cylinder. The seal has a stretched state when extended into a cylindrical shape and a folded state when contracted into an accordion shape. The upper end of the seal is fixed between the inner cylinder and the shell. The lower end of the seal surrounds the outside of the powder pressing cylinder and is sealed to the powder pressing cylinder.

[0009] When the powder pressing cylinder moves downward to press the powder, the lower end of the sealing element moves downward with the powder pressing cylinder and extends into a cylindrical stretched state; when the powder pressing cylinder moves upward to return to the outside of the inner cylinder, the lower end of the sealing element moves upward with the powder pressing cylinder and retracts into an accordion-style folded state.

[0010] Preferably, the lower end of the seal is interference-fitted with the outer side of the powder pressing cylinder; when the seal is in a stretched state, its length is adapted to the height of the inner cylinder.

[0011] Specifically, when contracted, it folds into an accordion-like shape, saving space; when stretched, its folded structure gradually unfolds, approaching or remaining vertical.

[0012] Preferably, the upper end of the seal has a retaining ring, which is adapted to and engaged between the inner cylinder and the shell.

[0013] Specifically, the retaining ring can have different structural configurations to adapt to the structure between the inner cylinder and the shell; the retaining ring is pressed between the inner cylinder and the shell, and the sealing element is fixed between the inner cylinder and the shell through the retaining ring;

[0014] The retaining ring is mainly used to fix the upper end of the seal, so that the upper end is pressed tightly and will not move.

[0015] Preferably, the lower end of the sealing element has an interference fit ring, and the outer side of the powder pressing cylinder is provided with an annular protrusion, and the interference fit ring is engaged with the annular protrusion.

[0016] Specifically, the interference fit ring is engaged below the annular protrusion. The annular protrusion holds the interference fit ring in place, preventing the seal from falling off the powder pressing cylinder. The interference fit at the lower end allows the seal to move up and down with the powder pressing cylinder, causing expansion and contraction deformation while ensuring its sealing performance.

[0017] Preferably, there is a gap between the inner wall of the powder pressing cylinder and the outer wall of the inner cylinder.

[0018] Specifically, there is a gap between the tamping cylinder and the inner cylinder to prevent friction when the tamping cylinder and the inner cylinder move relative to each other. However, due to the gap, coffee powder can easily enter the connection structure between the tamping cylinder and the inner cylinder. Therefore, the accordion-style seal is used to ensure the airtightness of the internal connection structure.

[0019] Preferably, the powder pressing cylinder is a cylindrical structure with an opening at the top, and a longitudinal lead screw is provided at the bottom of the inner side of the powder pressing cylinder; the lead screw is threaded on both the inner and outer sides.

[0020] Specifically, the bottom of the lead screw is fixedly connected to the bottom of the powder pressing cylinder, which can be fixed by screws; the up and down movement of the lead screw drives the up and down movement of the powder pressing cylinder.

[0021] Preferably, the inner cylinder has a screw on its inner side; a driving device is connected to the top of the screw; the inner wall of the inner cylinder has a thread adapted to the screw; the screw is sleeved on the outer side of the screw, and the thread on its outer side engages with the thread on the inner wall of the inner cylinder.

[0022] Specifically, the rotation of the screw drives the rotation and up-and-down movement of the lead screw, which in turn drives the powder pressing cylinder to move up and down to press the powder.

[0023] The lead screw has threads on both the inner and outer sides. The inner thread works with the screw to achieve a rotary up-and-down movement, while the outer thread works with the inner thread of the inner cylinder to enhance the stability of the movement and improve the powder pressing effect.

[0024] Preferably, the driving device is fixedly mounted on the top of the housing, the bottom of the housing is provided with a powder receiving cup, the side wall of the housing is provided with a powder inlet, and the powder inlet of the housing is connected to a powder inlet channel.

[0025] Specifically, the height of the housing is adapted to the sum of the heights of the inner cylinder and the tamping cylinder; the inlet is located in the lower middle part of the housing; the sealing element can prevent coffee powder entering through the inlet from entering the gap between the tamping cylinder and the inner cylinder, thereby affecting the threaded connection and rotation between the lead screw and the screw rod.

[0026] Preferably, the drive device includes a sun gear and a plurality of planet gears surrounding the sun gear. The planet gears are meshed with the sun gear. A large rotating wheel is provided on the outer side of the planet gears. The large rotating wheel is meshed with the planet gears. The screw is connected to the sun gear.

[0027] Specifically, the outer side of the large rotating wheel is gear-shaped, which can be connected to a drive handle or a drive motor. The handle or drive motor can be connected to a longitudinal gear to drive it to rotate, and then the longitudinal gear meshes with the large gear to drive the large gear to rotate.

[0028] The large rotating wheel is driven manually or by an electric motor, which in turn drives the planetary gears to rotate. The planetary gears drive the central sun gear to rotate, which in turn drives the screw to rotate.

[0029] A coffee machine that uses an accordion-sealed tamping mechanism as described in any of the above.

[0030] Compared with the prior art, the present invention achieves the following beneficial effects:

[0031] This utility model provides an accordion-sealed tamping mechanism and its coffee machine. A retractable annular seal is provided between the housing and the tamping cylinder. The upper end of the seal is fixed between the inner cylinder and the housing, and the lower end is interference-fitted onto the outside of the tamping cylinder. When contracted, it forms an accordion-like fold; when extended, it forms a cylindrical stretch. Compared to traditional fixed sealing rings, the accordion-like sealing structure reduces friction between the sealing ring and the sidewall, resulting in smoother rotation and movement. It also prevents coffee powder from entering the screw, lead screw, or other meshing gear structures through the gap between the tamping cylinder and the inner cylinder, thus affecting equipment operation. The accordion-like sealing structure is simple and improves the sealing effect of the dynamic structure and the equipment. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a coffee machine according to an embodiment of the present utility model;

[0033] Figure 2 This is a connection diagram of a bellows-sealed powder pressing mechanism in an embodiment of this utility model;

[0034] Figure 3 This is a schematic diagram of the structure of a bellows-sealed powder pressing mechanism according to an embodiment of the present utility model;

[0035] Figure 4 This is a schematic cross-sectional view of a bellows-sealed powder pressing mechanism in a folded state according to an embodiment of the present utility model;

[0036] Figure 5 This is a schematic cross-sectional view of a bellows-sealed powder pressing mechanism in a tensile state according to an embodiment of the present utility model.

[0037] Figure 6 This is a schematic diagram of the folded state of the sealing element of a bellows-sealed powder pressing mechanism according to an embodiment of the present utility model;

[0038] Figure 7 This is a schematic diagram of the stretched state of the sealing element of a bellows-sealed powder pressing mechanism according to an embodiment of the present utility model;

[0039] Figure 8 This is a schematic diagram of the powder pressing cylinder structure of a bellows-sealed powder pressing mechanism according to an embodiment of the present utility model;

[0040] Figure 9 This is a schematic diagram of the drive device structure of a bellows-sealed powder pressing mechanism in an embodiment of this utility model.

[0041] Figure label:

[0042] 1. Coffee machine; 2. Powder tamping mechanism;

[0043] 21. Powder tamping cylinder; 211. Annular convex strip; 212. Lead screw;

[0044] 22. Inner cylinder; 221. Screw;

[0045] 23. Seals; 231. Retaining rings; 232. Interference fit rings;

[0046] 24. Housing; 241. Powder receiving cup; 242. Powder inlet; 243. Powder inlet channel;

[0047] 25. Drive mechanism; 251. Sun gear; 252. Planet gears; 253. Large rotor. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0049] Example

[0050] like Figures 1 to 9 A bellows-sealed powder pressing mechanism 2 includes a housing 24 and a powder pressing cylinder 21 that can move up and down inside the housing 24. An inner cylinder 22 adapted to the powder pressing cylinder 21 is also fixed inside the housing 24. The inner cylinder 22 is connected to and provided with a driving device 25, and the driving device 25 drives the powder pressing cylinder 21 to move up and down.

[0051] The powder pressing cylinder 21 is fitted onto the outside of the inner cylinder 22 from below, and moves up and down along the outer side of the inner cylinder 22;

[0052] A retractable annular seal 23 is provided between the housing 24 and the powder pressing cylinder 21. The seal 23 has a stretched state in which it is extended into a cylindrical shape and a folded state in which it is contracted into an accordion shape. The upper end of the seal 23 is fixed between the inner cylinder 22 and the housing 24. The lower end of the seal 23 surrounds the outside of the powder pressing cylinder 21 and is sealed to the powder pressing cylinder 21.

[0053] The lower end of the sealing element 23 is interference-fitted with the outer side of the powder pressing cylinder 21; when the sealing element 23 is in a stretched state, its length is adapted to the height of the inner cylinder 22.

[0054] When contracted, it folds into an accordion shape, saving space; when stretched, its folded structure gradually unfolds, approaching or remaining vertical.

[0055] The upper end of the sealing element 23 has a retaining ring 231, which is adapted to and snapped between the inner cylinder 22 and the shell 24.

[0056] The retaining ring 231 can have different structural states to adapt to the structure between the inner cylinder 22 and the shell 24; the retaining ring 231 is pressed between the inner cylinder 22 and the shell 24, and the sealing element 23 is fixed between the inner cylinder 22 and the shell 24 by the retaining ring 231;

[0057] The retaining ring 231 is mainly used to fix the upper end of the sealing element 23, so that the upper end is pressed and will not move.

[0058] The lower end of the sealing element 23 has an interference fit ring 232, and the outer side of the powder pressing cylinder 21 is provided with an annular protrusion 211. The interference fit ring 232 and the annular protrusion 211 are engaged and connected.

[0059] The interference fit ring 232 is engaged below the annular protrusion 211. The annular protrusion 211 holds the interference fit ring 232 in place, preventing the seal 23 from falling off the powder pressing cylinder 21. The interference fit at the lower end allows the seal 23 to move up and down with the powder pressing cylinder 21 and undergo expansion and contraction deformation, while ensuring its sealing performance.

[0060] There is a gap between the inner wall of the powder pressing cylinder 21 and the outer wall of the inner cylinder 22.

[0061] There is a gap between the tamping cylinder 21 and the inner cylinder 22 to avoid friction when the tamping cylinder 21 and the inner cylinder 22 move relative to each other. However, the gap also makes it easy for coffee powder to enter the connection structure between the tamping cylinder 21 and the inner cylinder 22. Therefore, the accordion-style seal 23 is used to ensure the sealing of the internal connection structure.

[0062] The powder pressing cylinder 21 is a cylindrical structure with an opening at the top. A longitudinal lead screw 212 is provided at the bottom inner side of the powder pressing cylinder 21. The lead screw 212 is threaded on both the inner and outer sides.

[0063] The bottom of the lead screw is fixedly connected to the bottom of the powder pressing cylinder 21, which can be fixed by screws; the up and down movement of the lead screw 212 drives the up and down movement of the powder pressing cylinder 21.

[0064] The inner cylinder 22 has a screw 221 on its inner side; a drive device 25 is connected to the top of the screw 221; the inner wall of the inner cylinder 22 has a thread that is compatible with the lead screw 212; the lead screw 212 is sleeved on the outer side of the screw 221, and the thread on its outer side is engaged with the thread on the inner wall of the inner cylinder 22.

[0065] The rotation of the screw 221 drives the rotation and up-and-down movement of the lead screw 212, which in turn drives the powder pressing cylinder 21 to move up and down to press the powder.

[0066] The lead screw 212 has threads on both the inner and outer sides. Its inner thread is matched with the screw 221 to achieve the effect of rotational up and down movement. The outer thread is matched with the inner thread of the inner cylinder 22 to enhance the stability of movement and improve the powder pressing effect.

[0067] The driving device 25 is fixedly installed on the top of the housing 24. The bottom of the housing 24 is provided with a powder receiving cup 241. The side wall of the housing 24 is provided with a powder inlet 242. The powder inlet 242 of the housing 24 is connected to a powder inlet channel 243.

[0068] The height of the housing 24 is adapted to the sum of the heights of the inner cylinder 22 and the tamping cylinder 21; the inlet 242 is located in the lower middle part of the housing 24; the seal 23 can prevent coffee powder entering through the inlet 242 from entering the gap between the tamping cylinder 21 and the inner cylinder 22, thereby affecting the threaded connection and rotation between the lead screw 212 and the screw 221.

[0069] The drive device 25 includes a sun gear 251 and a plurality of planet gears 252 surrounding the sun gear 251. The planet gears 252 are meshed with the sun gear 251. A large rotating wheel 253 is provided on the outer side of the planet gears 252. The large rotating wheel 253 is meshed with the planet gears 252. The screw 221 is connected to the sun gear 251.

[0070] The outer side of the large rotating wheel 253 is gear-shaped and can be connected to a drive handle or drive motor. The handle or drive motor can be connected to a longitudinal gear to drive it to rotate. The longitudinal gear then meshes with the large gear to drive the large gear to rotate.

[0071] The large rotating wheel 253 is driven to rotate manually or by a motor, which in turn drives the planetary gear 252 to rotate. The planetary gear 252 drives the central sun gear 251 to rotate, and the sun gear 251 then drives the screw 221 to rotate.

[0072] A coffee machine 1 uses an accordion-sealed tamping mechanism 2 as described above.

[0073] This utility model provides an accordion-sealed tamping mechanism 2 and its coffee machine 1. The screw 221 is driven to rotate by a drive device 25, and the screw 221 drives the lead screw 212 to rotate. The bottom of the lead screw 212 is connected to the bottom of the tamping cylinder 21, thereby driving the tamping cylinder 21 to move up and down.

[0074] When the powder pressing cylinder 21 moves downward to press powder, the lower end of the sealing member 23 moves downward with the powder pressing cylinder 21 and extends into a cylindrical stretched state; when the powder pressing cylinder 21 moves upward to return to the outside of the inner cylinder 22, the lower end of the sealing member 23 moves upward with the powder pressing cylinder 21 and retracts into an accordion-style folded state.

[0075] Because there is a gap between the tamping cylinder 21 and the inner cylinder 22, the sealing element 23 moves up and down and its deformation structure prevents coffee powder from entering through the gap and affecting the threaded connection between the internal screw 221, lead screw 212, etc.

[0076] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A bellows-sealed powder pressing mechanism, comprising a housing and a powder pressing cylinder that can move up and down within the housing, wherein an inner cylinder adapted to the powder pressing cylinder is fixedly disposed within the housing, and the inner cylinder is connected to and provided with a driving device, the driving device driving the powder pressing cylinder to move up and down; characterized in that, The powder pressing cylinder is fitted onto the outside of the inner cylinder from below and moves up and down along the outer side of the inner cylinder; A retractable annular seal is provided between the shell and the powder pressing cylinder. The seal has a stretched state when extended into a cylindrical shape and a folded state when contracted into an accordion shape. The upper end of the seal is fixed between the inner cylinder and the shell. The lower end of the seal surrounds the outside of the powder pressing cylinder and is sealed to the powder pressing cylinder.

2. The bellows-sealed powder pressing mechanism according to claim 1, characterized in that, The lower end of the seal is interference-fitted with the outer side of the powder pressing cylinder; when the seal is in a stretched state, its length is adapted to the height of the inner cylinder.

3. The bellows-sealed powder pressing mechanism according to claim 1, characterized in that, The upper end of the seal has a retaining ring, which is adapted to and snapped between the inner cylinder and the shell.

4. The bellows-sealed powder pressing mechanism according to claim 1, characterized in that, The lower end of the seal has an interference fit ring, and the outer side of the powder pressing cylinder is provided with an annular protrusion. The interference fit ring and the annular protrusion are engaged and connected.

5. The bellows-sealed powder pressing mechanism according to claim 1, characterized in that, There is a gap between the inner wall of the powder pressing cylinder and the outer wall of the inner cylinder.

6. The bellows-sealed powder pressing mechanism according to claim 1, characterized in that, The powder pressing cylinder is a cylindrical structure with an opening at the top, and a longitudinal lead screw is provided on the bottom inner side of the powder pressing cylinder; the lead screw is threaded on both the inner and outer sides.

7. The bellows-sealed powder pressing mechanism according to claim 6, characterized in that, The inner cylinder has a screw on its inner side; a driving device is connected to the top of the screw; the inner wall of the inner cylinder has a thread adapted to the screw; the screw is sleeved on the outer side of the screw, and the thread on its outer side engages with the thread on the inner wall of the inner cylinder.

8. The bellows-sealed powder pressing mechanism according to claim 7, characterized in that, The driving device is fixedly installed on the top of the housing, the bottom of the housing is provided with a powder receiving cup, the side wall of the housing is provided with a powder inlet, and the powder inlet of the housing is connected to a powder inlet channel.

9. A bellows-sealed powder pressing mechanism according to claim 7, characterized in that, The drive device includes a sun gear and several planet gears surrounding the sun gear. The planet gears are meshed with the sun gear. A large rotating wheel is provided on the outer side of the planet gears. The large rotating wheel is meshed with the planet gears. The screw is connected to the sun gear.

10. A coffee machine, characterized in that, The accordion-sealed powder pressing mechanism described in any one of claims 1 to 9 is applied.

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