Brewing mechanism capable of automatically emptying residual liquid and coffee machine

Abstract

The brewing mechanism comprises a brewing device, a brewing piston, an outflow pipeline and a squeezing device, the outflow pipeline is provided with a one-way valve, the squeezing device is communicated with the section, located between the one-way valve and an outlet of the outflow pipeline, of the outflow pipeline, and when the brewing process is finished, the squeezing device is connected with the brewing piston. Due to the movement of the brewing piston and / or the brewing device, the squeezing device is forced to be squeezed, then positive pressure is applied to the outflow pipeline, finally residual liquid is driven to be discharged from the outflow pipeline, and therefore waste of coffee liquid cannot be caused. And other bearing structures and extra cleaning operation are not needed, so that the cost is well reduced.

Description

Technical Field

[0001] This utility model relates to the field of beverage brewing equipment, specifically to a brewing mechanism and coffee machine that can automatically drain residual liquid. Background Technology

[0002] The process of brewing beverages to create rich flavors has a long history, representing both a cultural practice and an integral part of daily social life. While tea and coffee were traditionally brewed by hand, advancements in automation and the fast pace of modern life have led to the widespread use of beverage brewing equipment, both in offices and homes.

[0003] EP1743554B1 discloses a coffee maker's brewing device, which is sealed and movable when assembled with a brewing piston. The device forms a brewing chamber within the brewer, and the beverage inside flows out from the outlet tube of the brewing piston. A back-suction device and a collection tray are provided at the front end of the outlet tube to generate negative pressure as the brewer resets at the end of the brewing process, drawing back the liquid remaining in the outlet tube and discharging it into the collection tray. While this method effectively cleans residual liquid in the pipes, the structure has two outlets and requires an additional collection tray, resulting in a complex structure and high cost. Furthermore, the back-suction to the collection tray necessitates regular cleaning. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a brewing mechanism and coffee machine that can automatically drain residual liquid.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A brewing mechanism capable of automatically draining residual liquid includes a brewer, a brewing piston, and an outlet pipe. The brewing piston engages with the brewing chamber of the brewer, and the outlet pipe connects to the brewing chamber. The outlet pipe is equipped with a one-way valve and also includes a squeezing device. The squeezing device connects to a section of the outlet pipe located between the one-way valve and the outlet of the outlet pipe. When the brewing process ends, the movement of the brewing piston and / or the brewer forces the squeezing device to be squeezed, thereby applying positive pressure to the outlet pipe and ultimately driving the residual liquid out of the outlet pipe.

[0007] Furthermore, the movement of the brewing piston and / or brewer causes the brewing piston to move relatively away from or closer to the brewer, thereby forcing the squeezing device to be squeezed.

[0008] Furthermore, the inlet end of the outlet pipe is located on the brewing piston or brewer.

[0009] Furthermore, when the brewing piston is engaged with the brewing chamber, it is sealed and movable within the brewing chamber of the brewer. The brewing piston or brewer is provided with an outlet, which is the inlet end of the outflow pipe. The one-way valve is located inside the outlet.

[0010] Furthermore, the outflow pipe also includes a tee pipe and a liquid outlet pipe. The three ports of the tee pipe are respectively connected to the outlet, the extrusion device, and the liquid outlet pipe. The outlet of the liquid outlet pipe is exposed as the outlet of the outflow pipe.

[0011] Furthermore, the extrusion device includes a piston cylinder with a piston chamber and a piston member. The piston chamber of the piston cylinder is connected to the outlet pipe, which is located in the section between the one-way valve and the outlet pipe. The piston member is sealed and movably assembled in the piston chamber. When the brewing piston is relatively far away from or close to the brewer, it forces the piston member to move relative to the piston chamber, thereby applying positive pressure to the outlet pipe.

[0012] Furthermore, the brewing piston is a movable part, and the piston cylinder is fixed on the brewing piston.

[0013] Furthermore, the extrusion device also includes an upper cover, which is fixedly installed, and the brewing piston is located between the upper cover and the brewer, with the piston component disposed on the piston cylinder or the upper cover.

[0014] Furthermore, the piston component is a plug, the piston chamber of the piston cylinder is provided with a buffer spring, the top cover is integrally formed with a top rod, when the brewing piston moves away from the brewer, the plug abuts against the top rod and overcomes the elastic force of the buffer spring to perform compression activity in the piston chamber, thereby applying positive pressure to the outflow pipe.

[0015] Furthermore, a guide hole is formed on the upper cover, and the other end of the piston component is movably assembled in the guide hole; an abutment plug is provided in the section of the guide hole away from the piston cylinder, and the piston component is fixed when it abuts against the abutment plug.

[0016] Furthermore, a guide hole is formed on the upper cover, and the other end of the piston is movably assembled in the guide hole; a compression spring is assembled in the guide hole, and the compression spring applies a spring force toward the piston cylinder to the piston.

[0017] Furthermore, it also includes a top cover, which is fixedly installed, and the brewing piston is located between the top cover and the brewer. The squeezing device also includes an elastic reset member, which applies a force to the piston in the direction of the top cover. The brewing piston moves away from the brewer until the piston abuts against the top cover, thereby forcing the piston to move relative to the piston chamber and thus applying positive pressure to the outflow pipe.

[0018] Furthermore, the extrusion device is equipped with an exhaust valve on the air outlet pipe connecting to the outflow pipe, and the piston is provided with an air inlet channel connecting to the piston cylinder, the air inlet channel being equipped with an air inlet valve; when the brewing piston moves away from the brewer, the piston moves away from the piston cylinder and opens the air inlet valve, thereby filling the piston cylinder with air; when the brewing piston moves closer to the brewer, the piston moves closer to the piston cylinder and opens the exhaust valve, the airflow in the piston cylinder is pressed to the outflow pipe to apply positive pressure to the outflow pipe.

[0019] Furthermore, the extrusion device is equipped with a one-way valve assembly on the air outlet pipe connecting to the outflow pipe. The one-way valve assembly includes a first channel, a second channel, an air inlet, an air inlet one-way valve, and an air outlet one-way valve. The first channel connects to the outflow pipe, and the second channel connects the first channel, the piston chamber of the piston cylinder, and the air inlet. The air inlet connects to the external environment. The air outlet one-way valve is located in the first channel and blocks the interface between the first channel and the second channel. The air inlet one-way valve is located in the second channel and blocks the air inlet. When the brewing piston moves away from the brewer, the piston part moves away from the piston cylinder and opens the air inlet one-way valve, thereby filling the piston cylinder with air. When the brewing piston moves closer to the brewer, the piston part moves closer to the piston cylinder and opens the air outlet one-way valve. The airflow in the piston cylinder is compressed to the outflow pipe to apply positive pressure to the outflow pipe.

[0020] Furthermore, the piston component is provided with an annular groove and an air inlet channel communicating with the annular groove. The annular groove is connected to the piston chamber through the air passage. A sealing ring is provided in the annular groove. The diameter of the sealing ring is smaller than the width of the annular groove so that it can move within the annular groove. When the brewing piston moves away from the brewer, the piston component moves away from the piston cylinder. The friction between the inner wall of the piston cylinder and the sealing ring drives the sealing ring to move and open the air passage, thereby filling the piston cylinder with air. When the brewing piston moves closer to the brewer, the piston component moves closer to the piston cylinder. The friction between the inner wall of the piston cylinder and the sealing ring drives the sealing ring to move and block the air passage, and apply positive pressure to the outflow pipe.

[0021] Furthermore, it also includes a first support member and a second support member, wherein the first support member is fixedly connected to the brewer and the piston member, and the second support member is fixedly connected to the brewing piston and the piston cylinder; or, the first support member is fixedly connected to the brewer and the piston cylinder, and the second support member is fixedly connected to the brewing piston and the piston member.

[0022] Furthermore, the inlet end of the outlet pipe is located on the brewer.

[0023] A coffee machine comprising at least the brewing mechanism described above that automatically drains residual liquid.

[0024] The technical solution provided by this utility model has the following beneficial effects:

[0025] The solution proposed in this application, by adding a squeezing device, forces the squeezing device to be squeezed at the end of the brewing process due to the movement of the brewing piston and / or the brewer, thereby applying positive pressure to the outlet pipe and ultimately driving the residual liquid to be discharged normally from the outlet pipe, thus preventing the waste of coffee liquid; and it does not require the addition of other receiving structures and additional cleaning operations, which also greatly reduces costs.

[0026] Meanwhile, the output of beverages and the discharge of residual liquid are both generated by the movement of the brewing piston or brewer, without the need for additional drive devices. Attached Figure Description

[0027] Figure 1 The image shown is a cross-sectional view of the brewing mechanism in Embodiment 1, which can automatically drain residual liquid, when brewing coffee.

[0028] Figure 2 The image shown is a cross-sectional view of the brewing mechanism in Embodiment 1, which can automatically drain the residual liquid, at the end of the brewing process.

[0029] Figure 3 The image shown is a cross-sectional view of the brewing mechanism in Embodiment 2, which can automatically drain residual liquid, when brewing coffee.

[0030] Figure 4 The image shown is a cross-sectional view of the brewing mechanism in Embodiment 2, which can automatically drain the residual liquid, at the end of the brewing process.

[0031] Figure 5 The image shown is a cross-sectional view of the brewing mechanism in Embodiment 3, which can automatically drain residual liquid, when brewing coffee.

[0032] Figure 6 The image shown is a cross-sectional view of the brewing mechanism in Embodiment 3, which can automatically drain the residual liquid, at the end of the brewing process.

[0033] Figure 7 The image shown is a cross-sectional view of the brewing mechanism in Embodiment 4, which can automatically drain residual liquid, when brewing coffee.

[0034] Figure 8 The image shown is a cross-sectional view of the brewing mechanism in Embodiment 4, which can automatically drain the residual liquid, at the end of the brewing process.

[0035] Figure 9 The image shown is a cross-sectional view of the brewing mechanism in Embodiment 7, which can automatically drain residual liquid, when brewing coffee.

[0036] Figure 10 The figure shown is a cross-sectional view of the brewing mechanism in Embodiment 7, which can automatically drain the residual liquid, when it is in the air-filled position.

[0037] Figure 11 The diagram shown is a schematic of the brewing mechanism in Embodiment 8 that can automatically drain residual liquid.

[0038] Figure 12 The diagram shown is a structural schematic of the one-way valve assembly in Embodiment 8;

[0039] Figure 13 The diagram shown is a schematic of the brewing mechanism in Example 9 that can automatically drain residual liquid.

[0040] Figure 14 The diagram shown is a structural schematic of the piston component in Example 9;

[0041] Figure 15 The figure shown is a cross-sectional view of the piston component in Embodiment 9, wherein the sealing ring opens the air passage;

[0042] Figure 16 The figure shown is a partial structural cross-sectional view of the piston component in Embodiment 9; wherein the sealing ring blocks the air passage. Detailed Implementation

[0043] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0044] In the description of this invention, terms such as "upper," "lower," "left," "right," "front," and "rear" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0046] Example 1

[0047] Reference Figure 1 and Figure 2As shown, this embodiment provides a brewing mechanism that can automatically drain residual liquid, including a brewer 10, a brewing piston 20, and an outlet pipe 30. The brewing piston 20 is used to cooperate with the brewer 10. Specifically, the brewing piston 20 can be separated from the brewer 10 or can extend into the brewing chamber 11 of the brewer 10 to form a cooperation. When the brewing piston 20 cooperates with the brewing chamber 11 of the brewer 10, it forms a seal with the brewing chamber 11. The outlet pipe 30 connects to the brewing chamber 11 of the brewer 10. Water enters the brewing chamber 11 from the brewer 10 for brewing and then flows out through the outlet pipe 30. The outlet pipe 30 is equipped with a one-way valve 23, which prevents residual liquid in the outlet pipe 30 from flowing back into the brewer 10.

[0048] It also includes a squeezing device 40, which connects to the outlet pipe 30, located between the one-way valve 23 and the outlet of the outlet pipe 30. In this specific embodiment, the inlet end of the outlet pipe 30 is located on the brewing piston 20; the brewing piston 20 has an outlet 31, which is the inlet end of the outlet pipe 30, and the one-way valve 23 is located inside the outlet 31. Furthermore, the outlet pipe 30 also includes a three-way pipe 32 and a liquid outlet pipe 33. The three ports of the three-way pipe 32 are respectively connected to the outlet 31, the squeezing device 40, and the liquid outlet pipe 33; the outlet 31, the three-way pipe 32, and the liquid outlet pipe 33 constitute the outlet pipe 30; the outlet of the liquid outlet pipe 33 is exposed as the outlet of the outlet pipe 30.

[0049] During use, the brewing piston 20 is sealed within the brewing chamber 11 of the brewer 10. Water enters the brewing chamber 11 from the brewer 10 for brewing, and then flows out through the outlet 31, three-way pipe 32, and liquid outlet pipe 33 of the brewing piston 20, finally flowing into the user's drinking vessel 1 (such as a coffee cup). When finished, the brewing piston 20 moves away from the brewer 10 (upward), forcing the squeezing device 40 to be squeezed, thereby applying positive pressure (i.e., blowing air) to the outlet pipe 30, normally discharging the liquid remaining in the outlet pipe 30 from the outlet of the outlet pipe 30 into the user's drinking vessel 1. It can be understood that after the drinking vessel 1 receives the beverage, before the equipment finishes operating, the remaining liquid will be normally discharged into the user's drinking vessel 1, thus preventing the waste of coffee liquid; and no additional receiving structure or additional cleaning operation is required, which also greatly reduces costs.

[0050] Meanwhile, the output of beverages and the discharge of residual liquid are both generated by the movement of the brewing piston 20, without the need for additional drive devices.

[0051] Specifically, a three-way connector 32 is used to connect the outlet 31, the extrusion device 40, and the liquid outlet pipe 33. The three-way connector 32 is a standard accessory that can be purchased directly from the market, and it is more convenient to connect. Of course, in other embodiments, the connection structure between the extrusion device 40 and the outlet pipe 30 is not limited to this.

[0052] Furthermore, in this embodiment, the extrusion device 40 includes a piston cylinder 41 with a piston chamber 411 and a piston member 42. The piston chamber 411 of the piston cylinder 41 is connected to the section of the outflow pipe 30 located between the one-way valve 23 and the outlet of the outflow pipe 30, that is, the piston chamber 411 of the piston cylinder 41 is connected to the interface of the three-way pipe 32, and is thus fixed on the brewing piston 20 and moves synchronously with the brewing piston 20. The piston member 42 is sealed and movably assembled in the piston chamber 411. At the same time, when the brewing piston 20 moves down to be sealed and fitted in the brewing chamber 11 of the brewer 10, the piston member 42 is sealed and fitted in the piston chamber 411 of the piston cylinder 41. In this way, it can be ensured that the beverage will not enter the piston cylinder 41 and leak out of the piston cylinder 41 when it is output.

[0053] More specifically, the extrusion device 40 also includes an upper cover 43, which is fixedly installed. The brewing piston 20 is located between the upper cover 43 and the brewer 10, with the brewer 10 at the bottom, the brewing piston 20 in the middle, and the upper cover 43 at the top. The piston member 42 is disposed on the upper cover 43. In this embodiment, the piston member 42 includes a stopper 421 and a stopper rod 422. The stopper 421 cooperates with the piston chamber 411. A guide hole 431 is formed on the upper cover 43. The other end of the piston member 42 (i.e., the stopper rod 422) is movably fitted into the guide hole 431. A pressure spring 44 is fitted into the guide hole 431. The pressure spring 44 applies a spring force toward the piston cylinder 41 to the piston member 42, i.e., a downward spring force. With this configuration, when the brewing piston 20 moves upward, the force applied by the compression spring 44 to the piston 42 acts as a buffer for the piston 42, preventing the brewing piston 20 from moving upward too quickly and causing the extrusion device 40 to output a strong positive pressure in a short time, which would then lead to splashing.

[0054] Furthermore, this embodiment also provides a coffee machine, which includes at least the brewing mechanism described above that can automatically drain residual liquid.

[0055] Example 2

[0056] The brewing mechanism that automatically drains residual liquid provided in this embodiment is largely the same as the brewing mechanism that automatically drains residual liquid provided in Embodiment 1, except that: (Refer to...) Figure 3 and Figure 4As shown, in this embodiment, the guide hole 431 is provided with an abutment plug 45 at a section away from the piston cylinder 41 (i.e., the upper section), and the pressure spring 44 in Embodiment 1 is not provided. The abutment plug 45 is relatively long. At the same time, the piston component 42 forms a sealed fit with the piston cavity 411 through a sealing ring. Thus, there is a frictional force between the piston component 42 and the piston cylinder 41. When the brewing piston 20 moves upward, the piston component 42 will first move upward with the brewing piston 20 until it abuts against the abutment plug 45. After that, the continued upward movement of the brewing piston 20 forces the piston component 42 to move relative to the piston cavity 411, thereby applying positive pressure to the outflow pipe 30.

[0057] Meanwhile, the piston cylinder 41 is provided with a baffle 412 at one end near the upper cover 43. When the brewing piston 20 moves down, the baffle 412 will move the piston part 42 down with it.

[0058] This embodiment also provides a coffee machine, which includes at least the brewing mechanism described above that can automatically drain residual liquid.

[0059] Example 3

[0060] The brewing mechanism that automatically drains residual liquid provided in this embodiment is largely the same as the brewing mechanism that automatically drains residual liquid provided in Embodiment 2, except that: (Refer to...) Figure 5 and Figure 6 As shown, in this embodiment, the piston 42 is a stopper 421, i.e., without the stopper rod 422 as in Embodiment 2. The piston chamber 411 of the piston cylinder 41 is provided with a buffer spring 46, and the upper cover 43 is integrally formed with a push rod 432. When the brewing piston 20 moves away from the brewer 10 (i.e., when the brewing piston 20 moves upward), the stopper 421 abuts against the push rod 432 and overcomes the elastic force of the buffer spring 46 to compress within the piston chamber 411, thereby applying positive pressure to the outlet pipe 30. The buffer spring 46 also applies a buffering force to the piston cylinder 41 and the brewing piston 20, with the same effect as in Embodiment 1, preventing the brewing piston 20 from moving upward too quickly and causing the squeezing device 40 to output a strong positive pressure in a short time, thus leading to splashing. When the brewing piston 20 moves downward, the buffer spring 46 drives the stopper 421 to move upward and reset.

[0061] This embodiment also provides a coffee machine, which includes at least the brewing mechanism described above that can automatically drain residual liquid.

[0062] Example 4

[0063] The brewing mechanism that automatically drains residual liquid provided in this embodiment is largely the same as the brewing mechanism that automatically drains residual liquid provided in Embodiment 2, except that: (Refer to...) Figure 7 and Figure 8As shown, in this embodiment, the piston 42 is not connected to the upper cover 43, and it also includes an elastic reset member 47, specifically a reset spring. The elastic reset member 47 applies a force to the piston 42 toward the upper cover 43. That is, the reset spring is sleeved on the outer periphery of the piston 42, with its upper end abutting against the piston 42 and its lower end abutting against the retaining wall 412 of the piston cylinder 41. The brewing piston 20 moves away from the brewer 10 (i.e., upward) until the piston 42 abuts against the upper cover 43. At this time, if the brewing piston 20 continues to move upward, it will force the piston 42 to move relative to the piston chamber 411, thereby applying positive pressure to the outlet pipe 30. The setting of the elastic reset member 47 can also play a certain buffering role in the upward movement of the brewing piston 20, avoiding the brewing piston 20 moving upward too quickly and causing the squeezing device 40 to output a strong positive pressure in a short time, thus causing splashing.

[0064] Furthermore, when the brewing piston 20 moves downward, the piston 42 is reset by the elastic reset member 47, waiting for the next extrusion output.

[0065] This embodiment also provides a coffee machine, which includes at least the brewing mechanism described above that can automatically drain residual liquid.

[0066] Example 5

[0067] The brewing mechanism that can automatically drain residual liquid provided in this embodiment is roughly the same as the brewing mechanism that can automatically drain residual liquid provided in Embodiment 2. The difference is that the piston 42 is fixedly connected to the upper cover 43. That is, the piston 42 includes a stopper 421 and a stopper rod 422. The stopper rod 422 is directly and integrally connected to the upper cover 43. The stopper 421 and the piston chamber 411 form a sealing fit. The stroke of the brewing piston 20 moving away from the brewer 10 (i.e. upward) is the relative movement stroke of the stopper 421 and the piston chamber 411.

[0068] This embodiment also provides a coffee machine, which includes at least the brewing mechanism described above that can automatically drain residual liquid.

[0069] Example 6

[0070] The brewing mechanism that automatically drains residual liquid provided in this embodiment is largely the same as the brewing mechanism that automatically drains residual liquid provided in embodiments one to five. The difference is that in this embodiment, the brewing piston 20 remains stationary, while the brewer 10 moves. The brewer 10 moves toward the brewing piston 20 (upward) so that the brewing piston 20 and the brewing chamber 11 are sealed together, thereby brewing and outputting the beverage. After brewing is completed, the brewer 10 moves away from the brewing piston 20 (downward) so that the brewer 10 and the brewing piston 20 are separated. At the same time, the movement of the brewer 10 away from the brewing piston 20 (downward) forces the squeezing device 40 to be squeezed, thereby applying positive pressure to the outlet pipe 30, and finally driving the residual liquid to be discharged through the outlet pipe 30. The specific implementation is as follows: the piston cylinder 41 is assembled on the brewer 10 and moves synchronously with the brewer 10. The outlet of the piston cylinder 41 can be connected to the outflow pipe 30 of the brewing piston 20 through a long flexible hose. At the same time, a base can be set below the brewer 10, and the base is used to cooperate with the piston 42. It can be understood that the base is equivalent to the function of the top cover 43 in embodiments one to five. In this way, when the brewer 10 moves away from the brewing piston 20 (downward), it can force the piston 42 to move in the piston chamber 411 of the piston cylinder 41, thereby applying positive pressure to the outflow pipe 30.

[0071] This embodiment also provides a coffee machine, which includes at least the brewing mechanism described above that can automatically drain residual liquid.

[0072] Example 7

[0073] The brewing mechanism that automatically drains residual liquid provided in this embodiment is largely the same as the brewing mechanism that automatically drains residual liquid provided in Embodiment 1, except that: Figure 9 and Figure 10 As shown, in this embodiment, the extrusion device 40 is equipped with an outlet check valve 61 on the outlet pipe 50 connecting to the outlet pipe 30. This outlet check valve 61 allows fluid (such as gas) to flow from the piston chamber 411 to the outlet pipe 30. The piston member 42 has an inlet channel 423 connecting to the piston chamber 411 of the piston cylinder 41. The inlet channel 423 is equipped with an inlet check valve 62. This inlet check valve 62 allows fluid (such as gas) to flow into the piston chamber 411 from the outside.

[0074] When the brewer 10 moves away from the brewing piston 20, the piston 42 moves away from the piston cylinder 41 and opens the air inlet check valve 62 (at this time, the air outlet check valve 61 is in the closed state), thereby filling the piston cylinder 41 with air. When the brewer 10 moves closer to the brewing piston 20, the piston 42 moves closer to the piston cylinder 41 and opens the air outlet check valve 61 (at this time, the air inlet check valve 62 is in the closed state), and the airflow in the piston cylinder 41 is pressed to the outlet pipe 30 to apply positive pressure to the outlet pipe 30.

[0075] Specifically, it also includes a first support member 71 and a second support member 72. The first support member 71 is fixedly connected to the brewer 10 and the piston member 42, and the second support member 72 is fixedly connected to the brewing piston 20 and the piston cylinder 41. In this embodiment, the second support member 72 remains stationary, and the piston member 42 and the brewer 10 are moved by the first support member 71. Of course, in other embodiments, the first support member 71 may remain stationary, and the second support member 72 may move the brewing piston 20 and the piston cylinder 41. Alternatively, the first support member 71 may be fixedly connected to the brewer 10 and the piston cylinder 41, and the second support member 72 may be fixedly connected to the brewing piston 20 and the piston member 42.

[0076] Its specific workflow is as follows: Figure 9 As shown, the brewing piston 20 is sealed within the brewing chamber 11 of the brewer 10. Water enters the brewing chamber 11 from the brewer 10 for brewing, and then flows out through the outlet pipe 30 to the user's drinking vessel 1 (such as a coffee cup). Due to the installation of the one-way valve 61, compared to the structures in Embodiments 1 to 6, it can better prevent the brewed liquid from flowing back from the outlet pipe 50 into the piston chamber 411 of the piston cylinder 41, thus preventing contamination. When brewing ends, the first support member 71 moves the piston member 42 and the brewer 10 downwards. At this time, due to the installation of the one-way valve 61, the outlet pipe 50 is blocked, and external air enters the piston chamber 411 through the air inlet channel 423, such as... Figure 10 As shown. Then, the first support member 71 drives the piston member 42 and the brewer 10 to move upward, the air inlet one-way valve 62 closes, the piston member 42 squeezes the piston chamber 411, and outputs the air in the piston chamber 411 to the outlet pipe 30 to apply positive pressure to the outlet pipe 30, so that the liquid remaining in the outlet pipe 30 is normally discharged from the outlet of the outlet pipe 30 into the user's drinking vessel 1.

[0077] This embodiment also provides a coffee machine, which includes at least the brewing mechanism described above that can automatically drain residual liquid.

[0078] Example 8

[0079] The brewing mechanism that automatically drains residual liquid provided in this embodiment is largely the same as the brewing mechanism that automatically drains residual liquid provided in Embodiment 7, except that: (Refer to...) Figure 11 and Figure 12 As shown, in this embodiment, the extrusion device 40 is equipped with a one-way valve assembly 80 on the air outlet pipe 50 connecting to the outflow pipe 30. The one-way valve assembly 80 includes a first channel 81, a second channel 82, an air inlet 83, an air inlet one-way valve 84, and an air outlet one-way valve 85. The first channel 81 connects to the outflow pipe 30, and the second channel 82 connects the first channel 81, the piston chamber 411 of the piston cylinder 41, and the air inlet 83. The air inlet 83 connects to the external environment. The air outlet one-way valve 85 is located in the first channel 81 and blocks the interface between the first channel 81 and the second channel 82. The air inlet one-way valve 84 is located in the second channel 82 and blocks the air inlet 83. When the brewing... When the piston 20 moves away from the brewer 10, as in this embodiment, the brewing piston 20 moves upward and away from the brewer 10, the piston part 42 moves away from the piston cylinder 41 and opens the air inlet one-way valve 84. In this embodiment, the piston cylinder 41 moves upward and away from the piston part 42, thereby filling the piston cylinder 41 with air. When the brewing piston 20 moves closer to the brewer 10, that is, when the brewing piston 20 moves downward and closer to the brewer 10, the piston part 42 moves closer to the piston cylinder 41 and opens the air outlet one-way valve 85. The airflow in the piston cylinder 41 is pressed to the outlet pipe 30 to apply positive pressure to the outlet pipe 30. In this way, the action of first filling and then venting the piston chamber 411 is also well realized.

[0080] This embodiment also provides a coffee machine, which includes at least the brewing mechanism described above that can automatically drain residual liquid.

[0081] Example 9

[0082] The brewing mechanism that automatically drains residual liquid provided in this embodiment is largely the same as the brewing mechanism that automatically drains residual liquid provided in Embodiment 7, except that: (Refer to...) Figures 13 to 16 As shown, the piston component 42 is provided with an annular groove 425 and an air passage 426 communicating with the annular groove 425. The annular groove 425 communicates with the piston chamber 411 through the air passage 426. A sealing ring 424 is provided in the annular groove 425. The diameter D1 of the sealing ring 424 is smaller than the groove width D2 of the annular groove 425, allowing it to move up and down within the annular groove 425. When the piston component 42 and the piston cylinder 41 are relatively far apart, such as Figure 13As shown, the piston 42 and piston cylinder 41 descend and move away from each other. The air pressure inside the piston cylinder 41 (i.e., piston chamber 411) is lower than the external ambient air pressure. The friction between the inner wall of the piston cylinder 41 and the sealing ring causes the sealing ring 424 to move upward within the annular groove 425. This opens the air passage 426. Figure 15 As shown, the piston chamber 411 is connected to the outside through the air passage 426, thereby allowing air to be pumped into the piston cylinder 41. When the piston component 42 is relatively close to the piston cylinder 41, as... Figure 13 As shown, piston 42 and piston cylinder 41 rise relative to each other and approach each other. The air pressure in piston chamber 411 is greater than that in the external environment. The friction between the inner wall of piston cylinder 41 and the sealing ring drives the sealing ring 424 to move downward and block the air passage 426. Figure 16 As shown, at this time, the piston 42 and the piston cylinder 41 continue to rise relative to each other, squeezing the piston chamber 411 and forcing the air in the piston chamber 411 out of the outlet pipe 50 to the outlet pipe 30 to apply positive pressure to the outlet pipe 30; in this way, the action of first filling the piston chamber 411 with air and then venting it is also well realized.

[0083] This embodiment also provides a coffee machine, which includes at least the brewing mechanism described above that can automatically drain residual liquid.

[0084] The above discloses several preferred embodiments of this application. Of course, in other embodiments, the positions of piston cylinder 41 and piston element 42 can be interchanged. That is, piston cylinder 41 can be fixedly mounted on other components (not necessarily fixed to the upper cover 43), piston element 42 can be fixed on brewing piston 20, and piston chamber 411 of piston cylinder 41 can be connected to outlet pipe 30 through a long hose. In this way, when brewing piston 20 moves upward, it can also force squeezing device 40 to squeeze and output positive pressure. Alternatively, the cooperation between piston cylinder 41 and piston element 42 can be directly replaced by a retractable and expandable squeezer (similar to a manual squeezer used at the outlet of a drinking water bucket). Alternatively, the inlet end of outlet pipe 30 can also be set on brewer 10 and connected to brewing chamber 11. Alternatively, the effect of applying positive pressure to outlet pipe 30 in the above embodiments can also be achieved by moving brewer 10.

[0085] Specifically, the "relative movement between piston 42 and piston cavity 411" described above can mean that only piston 42 or only piston cavity 411 moves, or that piston 42 and piston cavity 411 move together, as long as they produce relative displacement. Other similar descriptions, such as "relative movement between brewing piston 20 and brewer 10," follow the same logic.

[0086] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A brewing mechanism capable of automatically draining residual liquid, comprising a brewer, a brewing piston, and an outlet pipe, wherein the brewing piston is used to cooperate with the brewing chamber of the brewer, and the outlet pipe is connected to the brewing chamber of the brewer; characterized in that: The outflow pipe is equipped with a one-way valve and also includes a squeezing device. The squeezing device is connected to a section of the outflow pipe between the one-way valve and the outlet of the outflow pipe. When the brewing process ends, the squeezing device is squeezed due to the movement of the brewing piston and / or the brewer, thereby applying positive pressure to the outflow pipe and ultimately driving the residual liquid out of the outflow pipe.

2. The brewing mechanism that can automatically drain residual liquid according to claim 1, characterized in that: The movement of the brewing piston and / or brewer causes the brewing piston to move away from or closer to the brewer, thereby forcing the squeezing device to be squeezed.

3. The brewing mechanism that can automatically drain residual liquid according to claim 1, characterized in that: The inlet end of the outflow pipe is located on the brewing piston or brewer.

4. The brewing mechanism that can automatically drain residual liquid according to claim 3, characterized in that: When the brewing piston is fitted with the brewing chamber, it is sealed and movable within the brewing chamber of the brewer. The brewing piston or brewer is provided with an outlet, which is the inlet end of the outflow pipe. The one-way valve is located inside the outlet.

5. The brewing mechanism that can automatically drain residual liquid according to claim 4, characterized in that: The outflow pipe also includes a tee pipe and a liquid outlet pipe. The three ports of the tee pipe are respectively connected to the outlet, the extrusion device, and the liquid outlet pipe. The outlet of the liquid outlet pipe is exposed as the outlet of the outflow pipe.

6. The brewing mechanism that can automatically drain residual liquid according to claim 3, characterized in that: The extrusion device includes a piston cylinder with a piston chamber and a piston member. The piston chamber of the piston cylinder is connected to the outlet pipe, which is located in the section between the one-way valve and the outlet pipe. The piston member is sealed and movably assembled in the piston chamber. When the brewing piston is relatively far away from or close to the brewer, it forces the piston member to move relative to the piston chamber, thereby applying positive pressure to the outlet pipe.

7. The brewing mechanism for automatically draining residual liquid according to claim 6, characterized in that: The brewing piston is a movable part, and the piston cylinder is fixed on the brewing piston.

8. The brewing mechanism that can automatically drain residual liquid according to claim 7, characterized in that: The extrusion device also includes an upper cover, which is fixedly installed. The brewing piston is located between the upper cover and the brewer, and the piston component is disposed on the piston cylinder or the upper cover.

9. The brewing mechanism for automatically draining residual liquid according to claim 8, characterized in that: The piston is a plug, the piston chamber of the piston cylinder is provided with a buffer spring, and the top cover is integrally formed with a top rod. When the brewing piston moves away from the brewer, the plug abuts against the top rod and overcomes the elastic force of the buffer spring to compress within the piston chamber, thereby applying positive pressure to the outflow pipe.

10. The brewing mechanism for automatically draining residual liquid according to claim 8, characterized in that: The upper cover has a guide hole, and the other end of the piston is movably assembled in the guide hole; the guide hole has an abutment plug at the part opposite to the piston cylinder, and the piston is fixed when it abuts against the abutment plug.

11. The brewing mechanism for automatically draining residual liquid according to claim 8, characterized in that: The upper cover has a guide hole, and the other end of the piston is movably assembled in the guide hole; the guide hole is equipped with a compression spring, and the compression spring applies a spring force to the piston towards the piston cylinder.

12. The brewing mechanism capable of automatically draining residual liquid according to claim 7, characterized in that: It also includes a top cover, which is fixedly installed. The brewing piston is located between the top cover and the brewer. The squeezing device also includes an elastic reset member, which applies a force to the piston in the direction of the top cover. The brewing piston moves away from the brewer until the piston abuts against the top cover, thereby forcing the piston to move relative to the piston chamber and thus applying positive pressure to the outflow pipe.

13. The brewing mechanism capable of automatically draining residual liquid according to claim 6, characterized in that: The extrusion device is equipped with an exhaust valve on the air outlet pipe that connects to the outflow pipe. The piston is provided with an air inlet channel that connects to the piston chamber of the piston cylinder, and the air inlet channel is equipped with an air inlet valve. When the brewing piston moves away from the brewer, the piston moves away from the piston cylinder and opens the air inlet valve, thereby filling the piston cylinder with air. When the brewing piston moves closer to the brewer, the piston moves closer to the piston cylinder and opens the exhaust valve. The airflow in the piston cylinder is forced to the outflow pipe to apply positive pressure to the outflow pipe.

14. The brewing mechanism that can automatically drain residual liquid according to claim 6, characterized in that: The extrusion device is equipped with a one-way valve assembly on the air outlet pipe connecting to the outflow pipe. The one-way valve assembly includes a first channel, a second channel, an air inlet, an air inlet one-way valve, and an air outlet one-way valve. The first channel connects to the outflow pipe, and the second channel connects the first channel, the piston chamber of the piston cylinder, and the air inlet. The air inlet connects to the external environment. The air outlet one-way valve is located in the first channel and blocks the interface between the first channel and the second channel. The air inlet one-way valve is located in the second channel and blocks the air inlet. When the brewing piston moves away from the brewer, the piston part moves away from the piston cylinder and opens the air inlet one-way valve, thereby filling the piston cylinder with air. When the brewing piston moves closer to the brewer, the piston part moves closer to the piston cylinder and opens the air outlet one-way valve. The airflow in the piston cylinder is compressed to the outflow pipe to apply positive pressure to the outflow pipe.

15. The brewing mechanism capable of automatically draining residual liquid according to claim 6, characterized in that: The piston component is provided with an annular groove and an air passage connecting the annular groove. The annular groove is connected to the piston chamber through the air passage. A sealing ring is provided in the annular groove. The diameter of the sealing ring is smaller than the width of the annular groove so that it can move within the annular groove. When the brewing piston moves away from the brewer, the piston component moves away from the piston cylinder. The friction between the inner wall of the piston cylinder and the sealing ring drives the sealing ring to move and open the air passage, thereby filling the piston cylinder with air. When the brewing piston moves closer to the brewer, the piston component moves closer to the piston cylinder. The friction between the inner wall of the piston cylinder and the sealing ring drives the sealing ring to move and block the air passage, and apply positive pressure to the outflow pipe.

16. The brewing mechanism capable of automatically draining residual liquid according to claim 13, 14, or 15, characterized in that: It also includes a first support member and a second support member, wherein the first support member is fixedly connected to the brewer and the piston member, and the second support member is fixedly connected to the brewing piston and the piston cylinder; or, the first support member is fixedly connected to the brewer and the piston cylinder, and the second support member is fixedly connected to the brewing piston and the piston member.

17. A coffee machine, characterized in that: It includes at least the brewing mechanism that can automatically drain residual liquid as described in any one of claims 1 to 16.

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