Extraction structure, extraction device and coffee machine

Abstract

The utility model discloses an extraction structure, extraction device and coffee machine relates to coffee machine technical field, wherein, extraction structure includes extraction cavity and drive motor, extraction cavity includes casing, and the piston and eccentric wheel in setting up in casing, the casing top opening setting, the piston sliding installation in casing, and including plug body part, and set up in the connecting portion, the connecting portion far from the one end eccentric connection of plug body part is in eccentric wheel, drive motor passes through casing, and transmission is connected in eccentric wheel, drive motor drives eccentric wheel rotation, to drive the piston in casing is away from or close to the direction sliding of opening. The utility model provides technical scheme can simplify the drive structure of piston, and guarantee the motion reliability of piston.

Description

Technical Field

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

[0002] A coffee machine is a common electrical appliance that uses high-temperature, high-pressure water to quickly extract flavor compounds from coffee grounds. The extraction device is one of its core components. The extraction device, through the cooperation of a tamping structure and an extraction structure, compresses the coffee grounds to carry out the coffee extraction process. The extraction structure, through the reciprocating motion of a piston, works in conjunction with the tamping structure to compress the coffee grounds and eject the extracted coffee grounds from the extraction chamber. However, the design of the drive structure that drives the piston in existing technologies is often inadequate, resulting in unreliable piston movement or overly complex drive structures. Utility Model Content

[0003] The main purpose of this invention is to provide an extraction structure, extraction device, and coffee machine that simplifies the drive structure and ensures the reliability of piston movement.

[0004] To achieve the above objectives, the extraction structure proposed in this utility model includes: An extraction chamber includes a housing, a piston and an eccentric wheel disposed within the housing, the housing having an opening at the top, the piston being slidably mounted within the housing, and including a plug portion and a connecting portion disposed within the plug portion, the end of the connecting portion away from the plug portion being eccentrically connected to the eccentric wheel; and A drive motor passes through the housing and is connected to the eccentric wheel. The drive motor drives the eccentric wheel to rotate, thereby driving the piston to slide away from or towards the opening.

[0005] In one embodiment, the eccentric wheel has a transmission column on the side away from the drive motor, and the end of the connecting part away from the plug body has an adjustment hole, through which the transmission column movably passes.

[0006] In one embodiment, the drive motor includes an output shaft, and the output shaft has a first stop groove on its periphery. The eccentric wheel has a transmission shaft sleeve, and the inner periphery of the transmission shaft sleeve has a first rib. The output shaft is inserted into the transmission shaft sleeve, and the first rib is engaged with the first stop groove.

[0007] In one embodiment, the drive motor can also drive the extraction chamber to oscillate.

[0008] In one embodiment, the housing has a mounting sleeve rotatably fitted onto the transmission shaft sleeve, and a clutch is provided between the mounting sleeve and the transmission shaft sleeve; When the clutch is engaged, the mounting bushing and the transmission bushing are connected via the clutch, so that the drive motor drives the extraction chamber to oscillate; when the clutch is disengaged, the transmission connection between the mounting bushing and the transmission bushing is broken, and the drive motor drives the piston to slide via the eccentric wheel.

[0009] In one embodiment, the eccentric wheel has a first clutch portion on the side facing the drive motor, and the mounting bushing has a second clutch portion on the side facing the eccentric wheel. The second clutch portion is slidably sleeved on the mounting bushing, and an elastic element is provided between the second clutch portion and the housing. The elastic element causes the second clutch portion to have a tendency to press against the first clutch portion. One of the first clutch portion and the second clutch portion has a limiting protrusion, and the other has a limiting groove. When the limiting protrusion is inserted into the limiting groove, the clutch is closed; when the limiting protrusion and the limiting groove are misaligned along the circumferential direction of the clutch, the clutch is disengaged.

[0010] In one embodiment, the housing includes a first housing and a second housing joined together, and an extraction cylinder disposed between the first housing and the second housing, the plug portion being slidably mounted on the extraction cylinder, and the opening being disposed on the extraction cylinder.

[0011] In one embodiment, the extraction cylinder is provided with a snap-fit ​​rib in the circumferential direction and a snap-fit ​​groove corresponding to the first housing and the second housing. The extraction cylinder is inserted between the first housing and the second housing, and the snap-fit ​​rib is snapped into the snap-fit ​​groove; and / or, A sealing ring is provided on the outer periphery of the plug body, and the sealing ring abuts against the inner periphery of the extraction cylinder.

[0012] This utility model also proposes an extraction device, including a housing and an extraction structure as described above disposed within the housing, wherein the extraction chamber is detachably installed in the housing.

[0013] This utility model also proposes a coffee machine, including the extraction device described above.

[0014] The technical solution of this utility model involves setting an extraction chamber, which includes a housing, a piston, and an eccentric wheel disposed within the housing. The housing has an opening at the top. The piston is slidably mounted within the housing and includes a plug portion and a connecting portion disposed within the plug portion. One end of the connecting portion away from the plug portion is eccentrically connected to the eccentric wheel. A drive motor passes through the housing and is drively connected to the eccentric wheel. The drive motor drives the eccentric wheel to rotate, thereby driving the piston to slide within the housing in a direction away from or towards the opening. This transmission method has a simple structure and high transmission efficiency, and can precisely control the sliding distance and speed of the piston. Compared with the existing technology that drives the piston through a complex and unstable linkage mechanism, the extraction structure of this embodiment not only simplifies the overall structure and reduces manufacturing costs, but also significantly improves the stability and reliability of piston movement. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of an embodiment of the extraction structure provided by this utility model; Figure 2 for Figure 1 Schematic diagram of the extraction chamber; Figure 3 for Figure 1 Exploded view of the extraction chamber; Figure 4 for Figure 1 A cross-sectional view of the extraction chamber when the piston is at its upper limit position; Figure 5 for Figure 1 A cross-sectional view of the extraction chamber when the piston is at its lower limit position; Figure 6 for Figure 1 An angled assembly diagram of the piston and drive motor; Figure 7 for Figure 1 Another angle of the assembly structure of the piston and drive motor; Figure 8 for Figure 1 Exploded view of the piston and drive motor at one angle; Figure 9 for Figure 1 Another exploded view of the piston and drive motor from another angle.

[0017] Explanation of icon numbers: 1. Extraction structure; 3. Extraction chamber; 31. Housing; 311. Mounting bushing; 312. First housing; 313. Second housing; 314. Extraction cylinder; 315. Connecting rib; 316. Connecting groove; 32. Piston; 321. Adjusting hole; 322. Plug body; 323. Connecting part; 324. Sealing ring; 33. Eccentric wheel; 331. Transmission column; 332. Transmission shaft sleeve; 333. First rib; 34. Guide plate; 5. Drive motor; 51. Output shaft; 511. First gear slot; 6. Clutch; 61. First clutch part; 611. Limiting protrusion; 612. Guide surface; 62. Second clutch part; 621. Limiting groove; 622. Second gear groove; 63. Elastic element.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] 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 some embodiments of the present utility model, and not all embodiments. 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 scope of protection of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] This utility model proposes an extraction structure 1 for use in the extraction device of a coffee machine. The coffee machine includes a main unit, and the extraction device is installed on the main unit. The coffee machine can be configured as a fully automatic coffee machine or a semi-automatic coffee machine. The extraction device can be detachably installed on the main unit or non-detachably installed on the main unit. The extraction structure 1 can be detachably installed on the extraction device or non-detachably installed on the extraction device.

[0023] Please see Figures 1 to 5 In one embodiment of this utility model, the extraction structure 1 includes: Extraction chamber 3 includes a housing 31, a piston 32 and an eccentric wheel 33 disposed within the housing 31. The top of the housing 31 is open. The piston 32 is slidably mounted within the housing 31 and includes a plug portion 322 and a connecting portion 323 disposed within the plug portion 322. One end of the connecting portion 323 away from the plug portion 322 is eccentrically connected to the eccentric wheel 33. Drive motor 5 passes through housing 31 and is connected to eccentric wheel 33 for transmission. The drive motor 5 drives the eccentric wheel 33 to rotate, thereby driving the piston 32 to slide away from or towards the opening.

[0024] Specifically, the top of the housing 31 is open, and the piston 32 is slidably installed inside the housing 31. The piston 32 and the housing 31 can be closed to form an extraction tank with an open top and sealed sides, which facilitates the receiving of ground coffee powder and allows the tamping structure to compress the coffee powder in the extraction tank for extraction. The piston 32 is slidably installed inside the housing 31, which facilitates the ejection of extracted coffee grounds from the extraction chamber 3 by the piston 32, realizing the function of automatically cleaning the coffee grounds remaining inside the extraction chamber 3 and reducing the trouble of manual cleaning by the user.

[0025] The extraction chamber 3 also includes an eccentric wheel 33, and the drive motor 5 passes through the housing 31 and is connected to the eccentric wheel 33. The connecting part 323 of the piston 32 is eccentrically connected to the side of the eccentric wheel 33 opposite to the drive motor 5, so that the drive motor 5 drives the eccentric wheel 33 to rotate, causing the piston 32 to slide back and forth within the housing 31. This transmission method has a simple structure and high transmission efficiency, and can accurately control the sliding distance and speed of the piston 32. Compared with the existing technology that drives the piston 32 through a complex and unstable linkage mechanism, the extraction structure 1 of this embodiment not only simplifies the overall structure and reduces manufacturing costs, but also significantly improves the stability and reliability of the piston 32's movement.

[0026] Furthermore, a transmission column 331 is provided on the side of the eccentric wheel 33 facing away from the drive motor 5, and an adjustment hole 321 is provided at the end of the connecting part 323 away from the plug body 322. The transmission column 331 is movably inserted through the adjustment hole 321. Specifically, the design of the transmission column 331 movably inserted through the adjustment hole 321 allows the transmission column 331 to slide within the adjustment hole 321 during the rotation of the eccentric wheel 33, thereby driving the piston 32 to reciprocate. This transmission method is not only simple in structure, but the setting of the adjustment hole 321 also plays a certain guiding role, preventing the piston 32 from deviating or jamming during sliding, thus improving the working reliability and service life of the extraction device. At the same time, this transmission method is also easy to install and disassemble, reducing maintenance costs and difficulties.

[0027] The piston 32 includes a plug body 322 and a connecting portion 323 disposed on the plug body 322. The plug body 322 is used to enclose the housing 31 to form an extraction groove with an open top and sealed circumferentially. To ensure the seal between the two, a sealing ring 324 is provided on the outer periphery of the plug body 322. The sealing ring 324 abuts against the inner periphery of the housing 31, thereby effectively preventing leakage of coffee powder or extraction liquid during the extraction process and ensuring the smooth progress of the extraction process. In addition, the sealing ring 324 also enhances the friction between the piston 32 and the housing 31, which helps the piston 32 remain stable during sliding and reduces noise and wear caused by vibration or impact.

[0028] The connecting part 323 can be integrally formed into the plug body 322, thereby facilitating the connection and transmission between the piston 32 and the eccentric wheel 33. The integral design also enhances the overall strength and stability of the piston 32. The transmission column 331 is eccentrically connected to the eccentric wheel 33, and the connecting part 323 is connected to the transmission column 331 via the adjustment hole 321. When the eccentric wheel 33 rotates, it drives the piston 32 to perform reciprocating linear motion, thereby achieving the functions of compressing the coffee powder and ejecting the extracted coffee grounds. To facilitate the processing of the adjustment hole 321, the connecting part 323 is configured as a plate structure. In other embodiments, the connecting part 323 and the plug body 322 can also be snap-fitted, glued, or connected by fasteners. The transmission column 331 can be integrally formed into the eccentric part, or it can be fixedly connected to the eccentric wheel 33 by welding or interference fit. This diverse connection method provides more flexibility in the design and manufacturing of the extraction structure 1, allowing the selection of the most suitable connection method according to actual needs and manufacturing processes.

[0029] In the embodiments of this utility model, please refer to Figure 9 The drive motor 5 includes an output shaft 51, and the output shaft 51 has a first stop groove 511 on its periphery. The eccentric wheel 33 has a transmission shaft sleeve 332, and the inner periphery of the transmission shaft sleeve 332 has a first protruding rib 333. The output shaft 51 is inserted into the transmission shaft sleeve 332, and the first protruding rib 333 is engaged with the first stop groove 511.

[0030] Specifically, this design achieves a stable transmission connection between the drive motor 5 and the eccentric wheel 33 through the insertion and engagement of the output shaft 51 and the transmission shaft sleeve 332, and the engagement of the first protrusion 333 and the first stop groove 511. When the drive motor 5 starts, the output shaft 51 begins to rotate, and the first stop groove 511 on its periphery rotates accordingly. Since the first protrusion 333 is engaged in the first stop groove 511, the transmission shaft sleeve 332 rotates along with the output shaft 51, thereby driving the eccentric wheel 33 to rotate. This transmission method is not only simple in structure but also highly efficient, ensuring that the power of the drive motor 5 is accurately transmitted to the eccentric wheel 33, thereby driving the piston 32 to reciprocate. At the same time, the engagement design of the first stop groove 511 and the first protrusion 333 also has a certain anti-disengagement function, which can prevent relative sliding or detachment between the transmission shaft sleeve 332 and the output shaft 51 due to vibration or impact during transmission, further improving the stability and reliability of the extraction structure 1. Furthermore, this structural design facilitates the disassembly of the drive motor 5 and the extraction chamber 3, allowing the extraction chamber 3 to be easily removed for direct rinsing. This enables users to perform deep cleaning of the extraction chamber 3, preventing bacterial growth caused by coffee grounds and extract residue, and ensuring the hygiene and safety of the coffee machine. Simultaneously, this detachable design also facilitates the inspection and replacement of components such as the piston 32 and eccentric wheel 33 inside the extraction chamber 3, extending the service life of the extraction structure 1 and reducing user maintenance costs.

[0031] In one embodiment, see Figures 1 to 9 The drive motor 5 can also drive the extraction chamber 3 to oscillate. That is, in this solution, the drive motor 5 can drive the piston 32 to slide and the extraction chamber 3 to oscillate, thus eliminating the need for separate drive motors 5 to drive the extraction chamber 3 to oscillate and the piston 32 to slide. This reduces the number of motors, simplifies the structure of the extraction device, and lowers production costs and failure rates. During the extraction process, the drive motor 5 drives the extraction chamber 3 to oscillate between the extraction position and the residue removal position (which is also the position for receiving coffee grounds), ensuring the coffee grounds are evenly distributed within the extraction tank. Then, it drives the piston 32 to slide, compressing and extracting the coffee grounds. Finally, the extracted coffee grounds are ejected from the extraction chamber 3. The entire process is highly automated, easy to operate, and improves the extraction efficiency and quality of coffee.

[0032] In this embodiment, the extraction position is at a certain angle between the extraction chamber 3 and the vertical direction, which facilitates the piston 32 to eject the coffee grounds and allows them to slide down the inclined side of the extraction chamber 3 into the grounds collection box. A guide plate 34 is provided on one side of the extraction chamber 3 to guide the sliding direction of the coffee grounds. The grounds removal position is at a position where the extraction chamber 3 is parallel to the vertical direction, which facilitates the collection of coffee powder and reduces the possibility of spillage. In other embodiments, two drive motors 5 can be provided, one dedicated to driving the extraction chamber 3 to swing, and the other dedicated to driving the piston 32 to slide.

[0033] Furthermore, refer to Figures 4 to 9 The housing 31 has a mounting sleeve 311 that is rotatably sleeved on the transmission shaft sleeve 332, and a clutch 6 is provided between the mounting sleeve 311 and the transmission shaft sleeve 332. When clutch 6 is engaged, mounting sleeve 311 and transmission sleeve 332 are connected via clutch 6, so that drive motor 5 drives extraction chamber 3 to swing; when clutch 6 is disengaged, the connection between mounting sleeve 311 and transmission sleeve 332 is broken, and drive motor 5 drives piston 32 to slide via eccentric wheel 33.

[0034] Specifically, the drive motor 5 is connected to the eccentric wheel 33 via the output shaft 51. To facilitate the connection between the output shaft 51 and the clutch 6, the output shaft 51 passes through the housing 31, and the clutch 6 is located between the eccentric wheel 33 and the housing 31. This design allows the drive motor 5 to operate in two modes. When the clutch 6 is engaged, the output shaft 51 is connected to the housing 31 via the clutch 6, and the drive motor 5 can drive the entire extraction chamber 3 to rotate, causing the extraction chamber 3 to swing between the extraction position and the grounds removal position, facilitating the even distribution of coffee powder and the sliding of coffee grounds. When the clutch 6 is disengaged, the connection between the output shaft 51 and the housing 31 is broken, and the output shaft 51 only drives the eccentric wheel 33 to rotate, thereby causing the piston 32 to slide, achieving the compression extraction of coffee powder and the ejection of coffee grounds.

[0035] Furthermore, the eccentric wheel 33 is provided with a first clutch part 61 on the side facing the drive motor 5, and the mounting bushing 311 is provided with a second clutch part 62 on the side facing the eccentric wheel 33. The second clutch part 62 is slidably sleeved on the mounting bushing 311, and an elastic member 63 is provided between the second clutch part 62 and the housing 31. The elastic member 63 makes the second clutch part 62 tend to press against the first clutch part 61. One of the first clutch part 61 and the second clutch part 62 is provided with a limiting protrusion 611, and the other is provided with a limiting groove 621. When the limiting protrusion 611 is inserted into the limiting groove 621, the clutch 6 is closed; when the limiting protrusion 611 and the limiting groove 621 are misaligned along the circumference of the clutch 6, the clutch 6 is disengaged.

[0036] Specifically, the mounting sleeve 311 is fitted onto the transmission sleeve 332, and the second clutch portion 62 is slidably fitted onto the mounting sleeve 311. Therefore, the second clutch portion 62 can slide relative to the housing 31 along the axial direction of the output shaft 51, but will not rotate relative to the housing 31. To limit the rotation of the second clutch portion 62 relative to the housing 31, for example, the mounting sleeve 311 has a second rib on its circumference, and the second clutch portion 62 has a second stop groove 622 on its inner circumference. The second clutch portion 62 is fitted onto the mounting sleeve 311, and the second rib engages with the second stop groove 622. The first clutch portion 61 is located on the eccentric wheel 33 and can rotate with the rotation of the eccentric wheel 33.

[0037] Furthermore, the extraction chamber 3 has an extraction position and a residue removal position, meaning that the extraction chamber 3 has two extreme positions during the oscillation process. At these two extreme positions, since the extraction chamber 3 can no longer oscillate, the rotation of the second clutch 62 is restricted. The drive motor 5 continues to rotate, which drives the first clutch 61 to separate from the second clutch 62. This causes the limiting protrusion 611 and the limiting groove 621 to be misaligned along the circumference of the clutch 6, thus allowing the first output shaft 51 to drive only the eccentric wheel 33 and the first clutch 61 to rotate. Correspondingly, the piston 32 also has an upper extreme position arranged in the vertical direction (see...). Figure 4 ) and lower limit position (see Figure 5 The upper limit position is used to push out coffee grounds, and the lower limit position is used to make way for coffee powder. When the first output shaft 51 drives the eccentric wheel 33 to rotate to the upper and lower limit positions, the limiting protrusion 611 is inserted into the limiting groove 621, the clutch 6 is closed, thereby switching the driving object of the drive motor 5.

[0038] Therefore, this solution has two limiting protrusions 611, and the angle between the lines connecting the two limiting protrusions 611 and the axis of the clutch 6 is 180°. Two corresponding limiting grooves 621 are also provided. Furthermore, this solution achieves rapid engagement and disengagement of the first clutch part 61 and the second clutch part 62 through the cooperation of the limiting protrusions 611 and the limiting grooves 621. The structure is simple and easy to assemble. In other embodiments, electromagnetic adsorption, snap-fit, or other methods can also be used to achieve rapid connection and disengagement of the first clutch part 61 and the second clutch part 62. Therefore, this solution does not limit the engagement and disengagement of the first clutch part 61 and the second clutch part 62; as long as the corresponding function can be achieved, it is within the protection scope of this solution.

[0039] Accordingly, in an extraction process, the working steps of the extraction device are as follows: When the extraction chamber 3 is in the residue removal position (also the position for receiving coffee powder) and the piston 32 is in the lower limit position, the clutch 6 is closed, and the extraction chamber 3 waits to receive coffee powder. After the coffee powder is received, the drive motor 5 drives the entire extraction chamber 3 to rotate in the first direction to the extraction position, and then the coffee extraction step is performed. After the extraction is completed, the drive motor 5 continues to rotate. At this time, since the continued rotation of the extraction chamber 3 is restricted, the drive motor 5 drives the first clutch part 61 to rotate relative to the second clutch part 62 through the eccentric wheel 33, so that the limiting protrusion 611 is disengaged from the limiting groove 621 and is circumferentially misaligned. The clutch 6 is disengaged, so that the drive motor 5 drives the eccentric wheel 33 to drive the piston 32 to move upward to the upper limit position, thereby pushing out the coffee grounds. At the upper limit position, the limiting protrusion 611 and the limiting groove 621 re-engage, and the clutch 6 closes. Then, the drive motor 5 drives the entire extraction chamber 3 to rotate in the second direction (opposite to the first direction) to return to the slag removal position. At the slag removal position, since the continued rotation of the extraction chamber 3 is restricted, the drive motor 5 drives the first clutch 61 to rotate relative to the second clutch 62 through the eccentric wheel 33, so that the limiting protrusion 611 and the limiting groove 621 disengage again and are circumferentially misaligned. The clutch 6 disengages, so that the drive motor 5 drives the eccentric wheel 33 to drive the piston 32 to move downward to the lower limit position, thus completing the entire extraction step, so as to facilitate the next extraction process.

[0040] It should be noted that the first direction can be clockwise, corresponding to a counter-clockwise direction for the second direction; conversely, the first direction can also be counter-clockwise, corresponding to a clockwise direction for the second direction. Furthermore, in this solution, the automatic disengagement and engagement of the clutch 6 are achieved by utilizing the extreme positions of the piston 32 and the extraction chamber 3. No additional complex control mechanisms are required; the clutch 6's engagement and disengagement can be precisely controlled solely by the positional changes of the piston 32 and the extraction chamber 3, thereby achieving automatic switching of the drive object driven by the drive motor 5. This design not only simplifies the structure of the extraction device and reduces production costs but also improves the automation and reliability of the extraction process. Of course, in other embodiments, sensors and control systems can also be used to precisely control the engagement and disengagement of the clutch 6 to achieve drive mode switching. However, compared to this complex design, the method of achieving automatic switching using the extreme positions of the piston 32 and the extraction chamber 3 in this solution is undoubtedly simpler, more practical, and lower in cost.

[0041] The limiting protrusion 611 can be located on the first clutch portion 61, with a corresponding limiting groove 621 located on the second clutch portion 62; alternatively, the limiting protrusion 611 can be located on the second clutch portion 62, while the limiting groove 621 is located on the first clutch portion 61. This design also satisfies the requirements for clutch 6 to close and disengage. The first clutch portion 61 can be integrally formed with the eccentric wheel 33. To facilitate the disengagement and engagement of the limiting protrusion 611 and the limiting groove 621, in one embodiment, guide surfaces 612 are provided on both opposite sides of the limiting protrusion 611. The guide surfaces 612 cause the limiting protrusion 611 to gradually narrow along its protruding direction. Specifically, the guide surfaces 612 allow the limiting protrusion 611 to slide more smoothly when inserted into or disengaged from the limiting groove 621, reducing problems of uneven clutch 6 closing or disengaging due to friction or jamming. This design not only improves the operational reliability of the clutch 6 but also extends its service life. Simultaneously, the presence of the guide surface 612 enhances the fit precision between the limiting protrusion 611 and the limiting groove 621, further ensuring that the clutch 6 can tightly connect the first clutch portion 61 and the second clutch portion 62 when closed, thereby effectively transmitting torque. Furthermore, this design simplifies the assembly process of the extraction device, reducing assembly difficulty and cost.

[0042] In the embodiments of this utility model, see Figure 3 The housing 31 includes a first housing 312 and a second housing 313 that are spliced ​​together, and an extraction cylinder 314 disposed between the first housing 312 and the second housing 313. The plug part 322 is slidably installed on the extraction cylinder 314, and the opening is disposed on the extraction cylinder 314.

[0043] Specifically, the first housing 312 and the second housing 313 can be joined together using common connection methods such as bolts and clips to form a relatively closed and stable structure, providing reliable installation space and protection for internal components such as the extraction cylinder 314, piston 32, and eccentric wheel 33. The extraction cylinder 314 not only provides a specific location for coffee powder extraction, ensuring smooth sliding contact with the stopper 322, but also ensures that the piston 32 can accurately compress and extract the coffee powder and eject the coffee grounds during reciprocating motion, thus improving the sealing of the extraction chamber. Furthermore, the opening on the extraction cylinder 314 facilitates the addition of coffee powder and the outflow of the extract, making the entire extraction process smoother and more efficient. This structural design of the housing 31 considers both structural stability and sealing, as well as operational convenience and practicality, contributing to improved overall performance and user experience of the extraction device.

[0044] Furthermore, the extraction cylinder 314 is provided with a circumferential locking rib 315 and a locking groove 316 corresponding to the first housing 312 and the second housing 313. The extraction cylinder 314 is inserted between the first housing 312 and the second housing 313, and the locking rib 315 is locked into the locking groove 316. This locking structure design allows the extraction cylinder 314 to be securely installed between the first housing 312 and the second housing 313, preventing it from loosening or falling off due to vibration or external force during the extraction process, thus ensuring the stability and reliability of the extraction device. At the same time, the cooperation between the locking rib 315 and the locking groove 316 also has a certain positioning function, ensuring the accuracy and consistency of the extraction cylinder 314 during installation and improving assembly efficiency. Moreover, the processing technology of the locking rib 315 and the locking groove 316 is relatively simple and the cost is low, which will not increase the overall manufacturing cost of the extraction device. In practical applications, the shape and size of the retaining rib 315 and retaining groove 316 can be flexibly adjusted according to the specific design requirements of the extraction cylinder 314 and the shell 31 to meet the needs of different models and specifications of extraction devices.

[0045] This utility model also proposes an extraction device, which includes a shell and an extraction structure 1. The specific structure of the extraction structure 1 is as described in the above embodiments. Since this extraction device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The extraction chamber 3 is detachably installed on the shell, thereby facilitating the individual cleaning or replacement of the extraction chamber 3. Of course, in other embodiments, the extraction chamber 3 may also be non-detachably installed on the shell.

[0046] It is understandable that when the extraction chamber 3 is detachable, the extraction chamber 3 and the drive motor 5 can also be detached and installed to facilitate disassembly. That is, the extraction chamber 3 can be disassembled separately, thereby enabling the extraction chamber 3 to be disassembled and cleaned separately, thereby further improving the ease of cleaning the extraction chamber 3, reducing the possibility of water entering the drive motor 5, and ensuring the driving reliability of the drive motor 5.

[0047] This utility model also proposes a coffee machine, which includes an extraction device. The specific structure of the extraction device is as described in the above embodiments. Since this coffee machine adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0048] The above are merely exemplary embodiments of this utility model and are not intended to limit the scope of this utility model. Any equivalent structural transformations made based on the technical concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the protection scope of this utility model.

Claims

1. An extraction structure, characterized in that, include: An extraction chamber includes a housing, a piston and an eccentric wheel disposed within the housing. The housing has an opening at the top. The piston is slidably mounted within the housing and includes a plug portion and a connecting portion disposed within the plug portion. One end of the connecting portion away from the plug portion is eccentrically connected to the eccentric wheel. as well as A drive motor passes through the housing and is connected to the eccentric wheel. The drive motor drives the eccentric wheel to rotate, thereby driving the piston to slide away from or towards the opening.

2. The extraction structure as described in claim 1, characterized in that, The eccentric wheel has a transmission column on the side away from the drive motor, and the end of the connecting part away from the plug body has an adjustment hole, through which the transmission column is movably inserted.

3. The extraction structure as described in claim 1, characterized in that, The drive motor includes an output shaft, and the output shaft has a first stop groove on its periphery. The eccentric wheel has a transmission shaft sleeve, and the inner periphery of the transmission shaft sleeve has a first rib. The output shaft is inserted into the transmission shaft sleeve, and the first rib is engaged with the first stop groove.

4. The extraction structure as described in claim 3, characterized in that, The drive motor can also drive the extraction chamber to oscillate.

5. The extraction structure as described in claim 4, characterized in that, The housing has a mounting sleeve that is rotatably sleeved on the transmission shaft sleeve, and a clutch is provided between the mounting sleeve and the transmission shaft sleeve; When the clutch is engaged, the mounting bushing and the transmission bushing are connected via the clutch, so that the drive motor drives the extraction chamber to oscillate; when the clutch is disengaged, the transmission connection between the mounting bushing and the transmission bushing is broken, and the drive motor drives the piston to slide via the eccentric wheel.

6. The extraction structure as described in claim 5, characterized in that, The eccentric wheel is provided with a first clutch part on the side facing the drive motor, and the mounting bushing is provided with a second clutch part on the side facing the eccentric wheel. The second clutch part is slidably sleeved on the mounting bushing, and an elastic element is provided between the second clutch part and the housing. The elastic element makes the second clutch part tend to press the first clutch part. One of the first clutch part and the second clutch part is provided with a limiting protrusion, and the other is provided with a limiting groove. When the limiting protrusion is inserted into the limiting groove, the clutch is closed; when the limiting protrusion and the limiting groove are misaligned along the circumferential direction of the clutch, the clutch is disengaged.

7. The extraction structure according to any one of claims 1 to 6, characterized in that, The housing includes a first housing and a second housing joined together, and an extraction cylinder disposed between the first housing and the second housing. The plug portion is slidably mounted on the extraction cylinder, and the opening is disposed on the extraction cylinder.

8. The extraction structure as described in claim 7, characterized in that, The extraction cylinder is provided with a snap-fit ​​rib on its circumference and a snap-fit ​​groove corresponding to the first housing and the second housing. The extraction cylinder is inserted between the first housing and the second housing, and the snap-fit ​​rib is snapped into the snap-fit ​​groove; and / or, A sealing ring is provided on the outer periphery of the plug body, and the sealing ring abuts against the inner periphery of the extraction cylinder.

9. An extraction apparatus, characterized in that, The device includes a housing and an extraction structure as described in any one of claims 1 to 8 disposed within the housing, wherein the extraction chamber is detachably mounted to the housing.

10. A coffee machine, characterized in that, Includes the extraction apparatus as described in claim 9.

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