Piston assembly and brewing device

Abstract

The utility model relates to a piston assembly of a brewing device and the brewing device. The piston assembly comprises a piston body, a piston head and a fastener. The fastener is used for detachably fastening the piston head located on the lower end side of the piston body to the piston body. The piston body is hollow, the upper end of the piston body is open, and the fastener is at least partially located in the piston body so that the fastener can be fastened or loosened by a tool extending from the upper end of the piston body. According to the piston assembly provided by the invention, the tool extends into the piston body from the upper end of the piston body to loosen or fasten the fastener, so that the piston head can be conveniently detached from the piston body or mounted on the piston body, and the cleaning work of the piston head is completed. This implementation helps to reduce the burden of maintenance work of the piston assembly.

Description

Technical Field

[0001] The present disclosure relates to the field of beverage equipment, and in particular, to a piston assembly and a brewing device. Background Art

[0002] The brewing device can be used to make beverages such as coffee. The brewing device generally includes a brewing cylinder and one or two piston assemblies, which together form a brewing chamber. Pressurized hot water flows through the brewing chamber to brew the powder or particles to be brewed, such as coffee powder or particles, in the brewing chamber to obtain a beverage.

[0003] The piston assembly extending from the upper end of the brewing cylinder can be called an upper piston assembly, and a filter screen is provided on its head and a flow path is provided inside it. The prepared beverage can flow out of the brewing chamber through the filter screen and the flow path in sequence. After being used for a period of time, residues or grease will be deposited on the filter screen and in the flow path, which may cause some unexpected consequences, such as deterioration of the quality of the beverage. In order to avoid unexpected consequences, the upper piston assembly needs to be regularly maintained.

[0004] During maintenance, at least part of the upper piston assembly needs to be removed to clean the filter and the flow path. However, for traditional brewing devices, the disassembly and installation process of the upper piston assembly is relatively inconvenient, which makes the maintenance of the upper piston assembly time-consuming and laborious. Utility Model Content

[0005] In view of this, the present disclosure provides a piston assembly and a brewing device having the same, aiming to improve the problem that the maintenance work of the upper piston assembly is time-consuming and labor-intensive.

[0006] On the one hand, the present disclosure provides a piston assembly of a brewing device. The brewing device includes a piston assembly and a brewing cylinder, and the piston assembly is configured to extend from the upper end of the brewing cylinder into the brewing cylinder. A brewing chamber of the brewing device for making a beverage is formed by at least the piston assembly and the brewing cylinder. A flow path for leading the beverage out of the brewing chamber is provided in the piston assembly. The piston assembly includes a piston body, a piston head and a fastener. The fastener is used to detachably fasten the piston head located at the lower end side of the piston body to the piston body. The piston body is hollow and has an open upper end, and the fastener is at least partially located in the piston body, so that the fastener can be fastened or loosened by a tool extending from the upper end of the piston body.

[0007] According to the piston assembly provided by the present disclosure, by inserting a tool from the upper end of the piston body to tighten or loosen the fastener, the piston head can be easily removed from the piston body or installed on the piston body to complete the cleaning of the piston head. This implementation method helps to reduce the maintenance burden of the piston assembly.

[0008] In a possible implementation, the piston assembly also includes a conveying member housed in the piston body. The conveying member includes a first tube portion, a peripheral wall portion, and a plurality of first rib portions. The first tube portion forms at least a portion of the flow path. The peripheral wall portion surrounds the first tube portion and is detachably fixed to the piston body. The plurality of first rib portions are arranged circumferentially spaced from each other between the first tube portion and the peripheral wall portion. Each first rib portion extends radially outward from the first tube portion to the peripheral wall portion.

[0009] In this way, the first tube portion can be reliably fixed in the piston body. In addition, the conveying member with such a structure can be relatively conveniently removed from the piston body or installed on the piston body to clean the flow path defined by the first tube portion. In addition, according to such a structure of the conveying member, a space for a tool to pass through will be formed between adjacent first rib portions, which makes the operation of tightening and loosening the fastener with the tool more convenient.

[0010] In a possible implementation manner, the plurality of first rib portions are distributed alternately with the fasteners in the circumferential direction.

[0011] Since the plurality of first rib portions are staggeredly distributed with the fasteners in the circumferential direction, the plurality of first rib portions will not or less likely block the tool, which enables the tool to directly reach the fastener downward, thereby making it more convenient to tighten and loosen the fastener with the tool.

[0012] In a possible implementation manner, a notch is provided at an inner upper corner of each first rib portion.

[0013] According to this configuration of the first rib portion, the upper end of the first tube portion has a longer portion that can be inserted into the lower end of the external tube of the brewing device, which facilitates reliable connection of the first tube portion to the external tube.

[0014] In a possible implementation, the piston body is provided with a clamping hole, and the peripheral wall portion is provided with a buckle. The buckle at least partially extends into the clamping hole to fix the peripheral wall portion to the piston body, and the buckle is elastically deformed and separated from the clamping hole when pressed.

[0015] Through the clamping hole on the piston body and the clamping buckle on the peripheral wall, the conveying member can be conveniently installed on and removed from the piston body, which further reduces the maintenance burden of the piston assembly.

[0016] In a possible implementation, the piston head includes a piston head body, a sealing ring and a filter screen. The piston head body is provided with a mounting recess, which is recessed inward from the outer circumferential surface of the piston head body and extends in the circumferential direction. The sealing ring is received by the mounting recess, and the filter screen is fixed to the piston head body and located at the lower side thereof. The filter screen is provided with a plurality of filter holes, and the beverage in the brewing chamber flows into the flow path through the plurality of filter holes.

[0017] By installing the recess, the sealing ring can be reliably installed on the piston head body. After the piston assembly is inserted into the brewing cylinder, the sealing ring will seal the gap between the piston assembly and the inner surface of the brewing cylinder. The prepared beverage flows into the flow path through the filter holes on the filter screen and eventually flows out of the brewing device. In addition, since the piston head can be removed from the piston body, when the piston head as a whole or part (for example, the filter screen on the piston head) is difficult to clean or expires, the piston head can be replaced modularly without replacing the entire piston assembly, which helps to reduce the maintenance cost of the brewing device.

[0018] In a possible implementation, the piston head body is provided with a downwardly recessed recess, a joint portion and a second rib portion. The joint portion extends upward from the bottom surface of the recess and is connected to the fastener. The second rib portion is provided in the recess and extends through the joint portion.

[0019] The recessed portion helps to reduce the weight of the piston head, thereby helping to reduce the weight of the brewing device. At the same time, the recessed portion helps to reduce the material required for the piston head, thereby helping to reduce the cost of the brewing device. The second rib portion extending through the joint can not only improve the strength of the piston head body, but also support the joint.

[0020] In one possible implementation, a first tube portion is provided in the piston body, and a second tube portion is provided in the piston head body that at least partially extends into the piston body, and one of the first tube portion and the second tube portion is inserted into the other to connect at least part of the flow path.

[0021] In this way, it is only necessary to properly install the conveying member and the piston head on the piston body, and one of the first tube part and the second tube part will be inserted into the other to complete the construction of the flow path, which helps to further improve the convenience of the disassembly and installation process of the piston assembly, and further helps to further reduce the burden of maintenance work on the piston assembly.

[0022] In a possible implementation, a throttling opening is provided at the top end of the second tube portion.

[0023] The throttling orifice can help the brewing chamber to build up the required pressure to make a good quality beverage. In addition, the throttling orifice helps to reduce the speed at which the beverage flows out of the brewing chamber, so that the beverage can flow out of the brewing chamber more slowly. Compared with building up pressure through a one-way valve, the throttling orifice has better performance in reducing costs and simplifying the structure. In addition, since the throttling orifice is arranged at the top of the second tube part, after the piston head is removed from the piston body, the throttling orifice can be cleaned more conveniently, especially considering that the throttling orifice is more likely to be blocked.

[0024] In a possible implementation, the bottom end wall of the piston body is provided with a plurality of guide holes, and the piston head is provided with a plurality of upwardly extending coupling parts. The plurality of coupling parts respectively at least partially extend into the plurality of guide holes to be coupled with the plurality of fasteners respectively. A shoulder is provided in each guide hole, and the shoulder of each guide hole abuts against the upper end surface of a corresponding coupling part.

[0025] In the process of installing the piston head to the piston body, the cooperation of the multiple joints and the multiple guide holes can guide the piston head and help the piston head to be well positioned in the axial direction. At the same time, the cooperation of the shoulder of each guide hole and the upper end surface of the corresponding joint can help the piston head to be well positioned in the axial direction. In addition, after the piston head and the piston body are assembled together, the cooperation of the multiple joints and the multiple guide holes can limit the rotation of the piston head relative to the piston body, so that the piston head is reliably fixed to the piston body.

[0026] In a possible implementation, the fastener is a threaded connection member including a stud and a nut, the piston head is provided with a coupling portion defining a threaded hole, and the lower end wall of the piston body is provided with a guide hole. The coupling portion at least partially extends into the guide hole, and the stud at least partially extends into the guide hole to be threadedly coupled with the threaded hole. The nut is located in the piston body, and the nut is configured to cooperate with a tool to be driven by the tool.

[0027] In this implementation, the tool cooperates with the nut located in the piston body to drive the threaded part to rotate, thereby tightening and loosening the stud and the threaded hole, and then the piston head can be easily installed on the piston body or removed from the piston body.

[0028] In a possible implementation, the diameter of the nut is larger than the inner diameter of the guide hole.

[0029] Since the diameter of the nut is larger than the inner diameter of the guide hole, no additional gasket is required to avoid fastening failure caused by the nut passing through the guide hole. Additional gaskets will not only increase the cost and complexity of the piston assembly, but also make the removal and installation of the piston head more inconvenient.

[0030] On the other hand, the present disclosure further provides a brewing device, which includes the above-mentioned piston assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments are briefly introduced below.

[0032] It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be viewed as limiting the scope.

[0033] It should also be understood that the same or similar reference numerals are used in the drawings to represent the same or similar elements.

[0034] It should also be understood that the drawings are merely schematic and that the sizes and proportions of elements in the drawings are not necessarily accurate.

[0035] Figure 1 It is a schematic structural diagram of a brewing device according to an embodiment of the present disclosure.

[0036] Figure 2 yes Figure 1 Schematic diagram of the structure of the piston assembly of the brewing device.

[0037] Figure 3 yes Figure 2 Exploded view of the piston assembly in FIG.

[0038] Figure 4 yes Figure 2 Schematic top view of the piston assembly in.

[0039] Figure 5 is along Figure 4 Schematic cross-sectional view taken along line AA.

[0040] Figure 6 yes Figure 2 Schematic diagram of the structure of the conveying part of the piston assembly.

[0041] Figure 7 yes Figure 2 Schematic diagram of the structure of the piston body of the piston assembly.

[0042] Figure 8 yes Figure 7 Schematic top view of the piston body in.

[0043] Fig. 9 is along Figure 8 Schematic cross-sectional view taken along line BB.

[0044] Fig.10 yes Figure 2 A schematic diagram of the structure of the piston body of the piston head of the piston assembly. DETAILED DESCRIPTION

[0045] The following is an exemplary description of the embodiments of the present disclosure in conjunction with the accompanying drawings. It should be understood that the present disclosure can be implemented in a variety of ways and should not be construed as being limited to the embodiments described here. The embodiments described here are only for a more thorough and clear understanding of the present disclosure.

[0046] Exemplary Brewing Device

[0047] The present disclosure provides a brewing device 100. The brewing device 100 is used to make beverages, such as coffee. The brewing device 100 can be used alone or as a functional unit in a beverage machine, such as a coffee machine. It is understood that the brewing device 100 is not limited to making coffee, and can also be used to make other types of beverages. The present disclosure does not specifically limit the type of beverage made by the brewing device 100.

[0048] refer to Figure 1 The brewing device 100 may include a frame 10, piston assemblies 20, 30, a brewing cylinder 40, a driving device 50, and a transmission mechanism 60. The piston assemblies 20, 30, the brewing cylinder 40, the driving device 50, and the transmission mechanism 60 may be mounted on the frame 10 to be supported by the frame 10. The piston assembly 20 may be referred to as an upper piston assembly, and the piston assembly 30 may be referred to as a lower piston assembly.

[0049] The driving device 50 can output power, which is transmitted to the brewing cylinder 40 via the transmission mechanism 60, so that the brewing cylinder 40 moves in the up-down direction relative to the piston assembly 20. For example, the driving device 50 can be a motor, and the transmission mechanism 60 can be a screw transmission mechanism. The upper end of the piston assembly 30 can extend into the brewing cylinder 40 to close the bottom end of the brewing cylinder 40. As the brewing cylinder 40 moves in the up-down direction, it will move with the piston assembly 30.

[0050] exist Figure 1 In the embodiment, the brewing cylinder 40 is in a lower position. At this time, the piston assembly 20 is separated from the brewing cylinder 40, and the top of the brewing cylinder 40 is open, and the powder or particles to be brewed (such as coffee powder or particles) can be added into the brewing cylinder 40. As the brewing cylinder 40 rises, the lower end of the piston assembly 20 extends into the brewing cylinder 40 to form a substantially closed brewing chamber together with the brewing cylinder 40 and the piston assembly 30.

[0051] The piston assembly 20 and the piston assembly 30 are both provided with flow paths. The brewing liquid (e.g., hot water) can flow into the brewing chamber through the flow path of the piston assembly 30 to brew the powder or granules in the brewing chamber to obtain a beverage. The brewed beverage can flow out of the brewing chamber through the flow path in the piston assembly 20. The brewed beverage can be taken and drunk directly, or it can be drunk after further processing.

[0052] Continue to refer Figure 1The brewing device 100 may further include a feeder 71 and a channel member 72, wherein the channel member 72 is mounted on the feeder 71, and the feeder 71 is mounted on the frame 10. The feeder 71 has a funnel-shaped feeding channel with a large upper end and a small lower end. The powder or particles to be brewed can be poured into the feeder 71 from above the feeder 71. The channel member 72 has a conveying channel. The conveying channel extends from the lower end of the feeder 71 to the upper end of the brewing cylinder 40 to deliver the powder or particles to be brewed into the brewing cylinder 40.

[0053] In the example where the brewing device 100 is applied to a coffee machine, a grinding device may be provided above the brewing device 100, and the grinding device may grind coffee beans into coffee powder or coffee particles. The feeder 71 may be used to receive the coffee powder or coffee particles from the grinding device and deliver the coffee powder or coffee particles to the channel member 72.

[0054] Continue to refer Figure 1 The brewing device 100 may further include a residue pusher 80. After brewing is completed, the brewing cylinder 40 will descend with the piston assembly 30. After descending to a lower position, the piston assembly 30 is blocked and stops. As the brewing cylinder 40 descends to the lowest position, the piston assembly 30 pushes the waste residue out of the brewing cylinder 40, and then the residue pusher 80 is driven to pivot, thereby pushing the waste residue and causing the waste residue to fall from the top of the brewing cylinder 40.

[0055] It should be understood that the above is only an example of the brewing device 100, and the brewing device 100 is not limited to the above. For example, in some examples, the brewing device 100 may only include the piston assembly 20 but not the piston assembly 30; in this case, the bottom end of the brewing cylinder 40 may have a bottom sealing structure. For another example, in some examples, the brewing chamber 40 may be fixed, and the driving device 50 may drive the piston assembly 20 to move up and down.

[0056] Exemplary Piston Assembly

[0057] The above is an exemplary description of the brewing device 100, and the following is an exemplary description of the piston assembly 20. It should be noted that the piston assembly 20 can also be applied to other types of brewing devices.

[0058] refer to Figure 2 , Figure 3 and Figure 5 The piston assembly 20 may include a piston body 21, a piston head 22 and a fastener 23. The piston head 22 is located at the lower end side of the piston body 21. The fastener 23 is used to detachably fasten the piston head 22 to the piston body 21. The piston body 21 is hollow and has an open upper end. The fastener 23 is at least partially located in the piston body 21, so that the fastener 23 can be fastened or loosened by a tool inserted from the upper end of the piston body 21.

[0059] According to the piston assembly 20 provided by the present disclosure, by inserting a tool from the upper end of the piston body 21 to loosen or tighten the fastener 23, the piston head 22 can be easily removed from the piston body 21 or installed on the piston body 21 to complete the cleaning of the piston head 22. This implementation method helps to reduce the burden of maintenance work on the piston assembly 20. In addition, since the piston head 22 can be removed from the piston body 21, when the piston head 22 is difficult to clean in whole or in part (for example, the filter screen 223 on the piston head 22) or expires, the piston head 22 can be replaced modularly without replacing the entire piston assembly 20, which helps to reduce the maintenance cost of the brewing device 100.

[0060] refer to Figure 5 and Figure 6 The piston assembly 20 may further include a conveying member 24 accommodated in the piston body 21. The conveying member 24 may include a first tube portion 241, a peripheral wall portion 242, and a plurality of first rib portions 243. The first tube portion 241 forms at least a portion of a flow path. The peripheral wall portion 242 surrounds the first tube portion 241 and is detachably fixed to the piston body 21. A plurality of first rib portions 243 are arranged between the first tube portion 241 and the peripheral wall portion 242 at intervals from each other in the circumferential direction. Each first rib portion 243 extends radially outward from the first tube portion 241 to the peripheral wall portion 242.

[0061] In this way, the first tube portion 241 can be reliably fixed in the piston body 21. In addition, the conveying member 24 of this structure can be easily removed from or installed on the piston body 21 to clean the flow channel defined by the first tube portion 241. In addition, according to this structure of the conveying member 24, a space for a tool to pass through will be formed between adjacent first rib portions 243, making it more convenient to tighten and loosen the fastener 23 with a tool.

[0062] refer to Figure 4 , the plurality of first rib portions 243 can be staggered with the fastener 23 in the circumferential direction. Since the plurality of first rib portions 243 are staggered with the fastener 23 in the circumferential direction, the plurality of first rib portions 243 will not or less block the tool, so that the tool can directly reach the fastener 23 downward, which will make the operation of fastening and loosening the fastener 23 by the tool more convenient.

[0063] refer to Figure 6 , the plurality of first ribs 243 may be provided with notches 2431 at the inner upper corners. According to the configuration of the first ribs 243, the upper end of the first tube 241 has a longer portion that can be inserted into the external tube 90 (at the inner corner) of the brewing device 100. Figure 1 This helps to reliably connect the first tube portion 241 to the external tube 90.

[0064] refer to Figures 5 to 7 The piston body 21 may be provided with a locking hole 211, and the peripheral wall portion 242 may be provided with a buckle 2421. The buckle 2421 may at least partially extend into the locking hole 211 to fix the peripheral wall portion 242 to the piston body 21. When pressed, the buckle 2421 can be elastically deformed to disengage from the locking hole 211.

[0065] Through the clamping hole 211 on the piston body 21 and the buckle 2421 on the peripheral wall portion 242 , the conveying member 24 can be conveniently installed on and removed from the piston body 21 , which further reduces the maintenance burden of the piston assembly 20 .

[0066] In one example, continue to refer to Figures 5 to 7 The piston body 21 may be provided with a plurality of holes 211 spaced apart along the circumferential direction, and the peripheral wall portion 242 may be provided with a plurality of buckles 2421 spaced apart along the circumferential direction. For example, the number of the holes 211 and the buckles 2421 may both be two. Of course, in other examples, the piston body 21 may be provided with more holes 211, and the peripheral wall portion 242 may be provided with more buckles 2421 correspondingly.

[0067] refer to Figure 3 The piston head 22 may include a piston head body 221, a sealing ring 222 and a filter screen 223. The piston head body 221 may be provided with a mounting recess 2211 that is recessed inward from its outer circumference and extends in the circumferential direction. The sealing ring 222 may be received by the mounting recess 2211. The filter screen 223 may be fixed to the piston head body 221 and located at the lower side thereof. The filter screen 223 is provided with a plurality of filter holes. The beverage in the brewing chamber may flow into the flow path through the plurality of filter holes.

[0068] The sealing ring 22 can be reliably mounted on the piston head body 221 through the mounting recess 2211. When the piston assembly 20 is partially inserted into the brewing cylinder 40, the sealing ring 222 seals the gap between the piston assembly 20 and the inner surface of the brewing cylinder 40. The prepared beverage flows into the flow path through the filtering holes on the filter screen 223, and finally flows out of the brewing device 100.

[0069] refer to Figure 5 and Fig.10 The piston head body 221 may be provided with a recessed portion 2212, a coupling portion 2213 and a second rib portion 2214. The recessed portion 2212 is recessed downward, and the coupling portion 2213 extends upward from the bottom surface of the recessed portion 2212 to the outside of the recessed portion 2212 to be coupled with the fastener 23. The second rib portion 2214 is provided in the recessed portion 2212 and extends through the coupling portion 2213.

[0070] The recessed portion 2212 helps to reduce the weight of the piston head 22, thereby helping to reduce the weight of the brewing device 100. At the same time, the recessed portion 2212 helps to reduce the material required for the piston head 22, thereby helping to reduce the cost of the brewing device 100. The second rib portion 2214 extending through the joint portion 2213 can not only improve the strength of the piston head 22, but also support the joint portion 2213.

[0071] refer to Figure 5 , Figures 8 to 10 The piston head body 221 may be provided with a second tube portion 2215 extending upward from the bottom surface of the recessed portion 2212. The second tube portion 2215 may at least partially extend into the piston body 21 through the through hole 212 on the bottom end wall of the piston body 21, so that one of the first tube portion 241 and the second tube portion 2215 may be inserted into the other to connect at least part of the flow path. Figure 5 As shown, in the current example, the upper end of the second tube portion 2215 is inserted into the lower end of the first tube portion 241. Of course, in other examples, the lower end of the first tube portion 241 may also be inserted into the upper end of the second tube portion 2215.

[0072] In this way, it is only necessary to properly install the conveying member 24 and the piston head 22 on the piston body 22, and one of the first tube portion 241 and the second tube portion 2215 will be inserted into the other to complete the construction of the flow path, which helps to further improve the convenience of the disassembly and installation process of the piston assembly 20, and thus helps to further reduce the burden of maintenance work on the piston assembly 20.

[0073] refer to Figure 5 , a throttling orifice 2216 may be provided at the top of the second tube portion 2215. The throttling orifice 2216 can help the brewing chamber to suggest the required pressure to make a good quality beverage. In addition, the throttling orifice 2216 can help reduce the speed at which the beverage flows out of the brewing chamber, so that the beverage can flow out of the brewing chamber more slowly. Compared with using a one-way valve to help build up pressure, the throttling orifice 2216 has better performance in reducing costs and simplifying structures. In addition, since the throttling orifice 2216 is provided at the top of the second tube portion 2215, after the piston head 22 is removed from the piston body 21, the throttling orifice 2216 can be cleaned more conveniently, especially considering that the throttling orifice 2216 is more easily blocked.

[0074] refer to Figure 5 , Fig. 9 and Fig.10The bottom end wall of the piston body 21 may also be provided with a plurality of guide holes 213, and the piston head 22 is provided with a plurality of coupling parts 2213. The plurality of coupling parts 2213 are at least partially extended into the plurality of guide holes 213 to be respectively coupled with the plurality of fasteners 23. A shoulder 2131 is provided in each guide hole 213, and the shoulder 2131 of each guide hole 213 abuts against the upper end surface of a corresponding coupling part 2213.

[0075] In the process of installing the piston head 22 to the piston body 21, the cooperation of the multiple joints 2213 and the multiple guide holes 213 can guide the piston head 22 and help the piston head 22 to be well positioned in the circumferential direction. At the same time, the cooperation of the shoulder 2131 of each guide hole 213 and the upper end surface of the corresponding joint 2213 can help the piston head 22 to be well positioned in the axial direction. In addition, after the piston head 22 and the piston body 21 are assembled together, the cooperation of the multiple joints 2213 and the multiple guide holes 213 can limit the rotation of the piston head 22 relative to the piston body 21, so that the piston head 22 is reliably fixed to the piston body 21.

[0076] refer to Figure 5 and Fig. 9 The fastener 23 may be a screw-connector 23, which may include a stud 231 and a nut 232. The coupling portion 2213 defines a threaded hole. The coupling portion 2213 extends into the guide hole 213 from the lower end thereof, and the stud 231 extends into the guide hole 213 from the upper end thereof to be threadedly coupled with the threaded hole defined by the coupling portion 2213. The fastener 23 can reliably fix the piston head 22 to the piston body 21 through the tight coupling of the stud 231 and the threaded hole.

[0077] In some examples, the diameter of the nut 232 can be larger than the inner diameter of the guide hole 213, so that no additional gasket is required to avoid fastening failure caused by the nut 232 passing through the guide hole. The additional gasket will not only increase the cost and complexity of the piston assembly 20, but also make the disassembly and installation of the piston head 21 more inconvenient.

[0078] The nut 232 may be configured to cooperate with a tool so as to be driven by the tool, which makes it possible to tighten and loosen the fastener 23 by the tool inserted into the piston body 21 .

[0079] The present disclosure does not impose any particular restrictions on the structure of the nut 232, as long as it can be driven by a tool. For example, a "I"-shaped groove or a "X"-shaped groove can be provided on the top surface of the nut 232; in this case, the tool can be a "I" screwdriver or a "X" screwdriver. For another example, a hexagonal groove can be provided on the top surface of the nut 232; in this case, the tool can be an internal hexagonal wrench. For another example, the nut 232 can be hexagonal as a whole; in this case, the tool can be an external hexagonal wrench.

[0080] It should be understood that the above is merely an example of the piston assembly 20 , and the piston assembly 20 is not limited to the above description.

[0081] For example, in some examples, the piston assembly 20 may include only one fastener 23 , and correspondingly, the piston body 21 may have only one coupling portion 2213 .

[0082] For another example, in some examples, the fastener 23 may be a nut 23, the coupling portion 2213 may be a stud 2213 partially extending into the piston body 21, and the nut 23 fastens the piston head 21 to the piston body by threaded coupling with the stud 2213. In this case, the fastener 23 will be completely located in the piston body 21.

[0083] It should be noted that the various elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0084] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into separate multiple components and / or parts. The disclosure "one" or "an" used to describe a component or part is not intended to exclude other components or parts.

[0085] It should be understood that although the terms "first" or "second" etc. may be used in the present disclosure to describe various elements (such as a first pipe portion and a second pipe portion), these elements are not defined by these terms, and these terms are only used to distinguish one element from another.

[0086] The protection scope of the present disclosure is not limited to the above-mentioned embodiments. Any changes or substitutions that can be conceived by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A piston assembly of a brewing device, the brewing device further comprising a brewing cylinder, the piston assembly being configured to extend from the upper end of the brewing cylinder into the brewing cylinder, a brewing chamber of the brewing device for making a beverage being formed by at least the piston assembly and the brewing cylinder, a flow path for leading the beverage out of the brewing chamber being provided in the piston assembly, characterized in that: The piston assembly includes a piston body, a piston head and a fastener, wherein the fastener is used to detachably fasten the piston head located at the lower end side of the piston body to the piston body; the piston body is hollow and has an open upper end, and the fastener is at least partially located in the piston body, so that the fastener can be tightened or loosened by a tool extending from the upper end of the piston body.

2. The piston assembly according to claim 1, characterized in that The piston assembly further includes a conveying member received in the piston body, wherein the conveying member includes: a first tube portion forming at least a portion of the flow path; a peripheral wall portion surrounding the tube portion and configured to be detachably fixed to the piston body; and A plurality of first rib portions are arranged between the first tube portion and the peripheral wall portion at intervals from each other in the circumferential direction, and each first rib portion extends radially outward from the first tube portion to the peripheral wall portion.

3. The piston assembly according to claim 2, characterized in that The plurality of first rib portions are distributed alternately with the fasteners in a circumferential direction.

4. The piston assembly according to claim 2, characterized in that: The piston body is provided with a clamping hole, and the peripheral wall portion is provided with a buckle; the buckle is configured to at least partially extend into the clamping hole to fix the peripheral wall portion to the piston body, and is configured to elastically deform when pressed and disengage from the clamping hole.

5. The piston assembly according to claim 1, characterized in that The piston head includes a piston head body, a sealing ring and a filter. The piston head body is provided with a mounting recess which is recessed inward from its outer circumferential surface and extends circumferentially. The sealing ring is received by the mounting recess. The filter is fixed to the piston head body and is located at the lower side thereof. The filter is provided with a plurality of filter holes. The beverage in the brewing chamber flows into the flow path through the plurality of filter holes.

6. The piston assembly according to claim 5, characterized in that The piston head body is provided with a downwardly recessed recessed portion, a coupling portion and a second rib portion, wherein the coupling portion extends upward from the bottom surface of the recessed portion and is configured to be coupled with the fastener, and the second rib portion is arranged in the recessed portion and extends through the coupling portion.

7. The piston assembly according to claim 5, characterized in that The piston body is provided with a first tube portion, the piston head body is provided with a second tube portion at least partially extending into the piston body, one of the first tube portion and the second tube portion is inserted into the other to connect to form at least a portion of the flow path, wherein a throttling orifice is provided at the top end of the second tube portion.

8. The piston assembly according to claim 1, characterized in that The bottom end wall of the piston body is provided with a plurality of guide holes, and the piston head is provided with a plurality of coupling parts extending upward; the plurality of coupling parts respectively at least partially extend into the plurality of guide holes to respectively couple with the plurality of fasteners; a shoulder is provided in each guide hole, and the shoulder of each guide hole abuts against the upper end surface of a corresponding coupling part.

9. The piston assembly according to claim 1, characterized in that The fastener is a threaded connection member including a stud and a nut, the piston head is provided with a coupling portion defining a threaded hole, and the lower end wall of the piston body is provided with a guide hole; the coupling portion at least partially extends into the guide hole, and the stud at least partially extends into the guide hole to be threadedly coupled with the threaded hole; the nut is located in the piston body and is constructed to cooperate with the tool to be driven by the tool; the nut is located in the piston body and its diameter is larger than the inner diameter of the guide hole.

10. A brewing device, characterized in that: The brewing device comprises a piston assembly according to any one of claims 1 to 9.

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