Circulating brewing device of coffee machine

Abstract

The utility model relates to the technical field of coffee machines, in particular to a circulating brewing device of a coffee machine, which comprises a liquid storage barrel, a sleeve, a rotating shaft, a spray head, a powder storage barrel and a barrel cover, the sleeve is arranged in the liquid storage barrel, the rotating shaft comprises a mounting part, a screw rod and a shaft rod, the shaft rod is hermetically and rotatably arranged in the liquid storage barrel, and the screw rod is rotatably arranged in the sleeve. A spiral liquid feeding channel is defined by a spiral groove of the screw and the inner wall of the sleeve, the spray head is arranged on the powder storage barrel, detachably covers the installation part and is arranged outside the sleeve in a sealing and sleeving mode, a communicating cavity is defined by an inner cavity of the spray head, the sleeve and the screw, the spray head is provided with a plurality of liquid spraying holes, and the sleeve is provided with a through hole. An inner cavity of the liquid storage barrel is communicated with the bottom end of the spiral liquid feeding channel through the through hole, and the powder storage barrel is provided with a plurality of brewing holes. Circulating brewing and mixing are achieved in a spiral feeding mode, so that brewing and mixing are more uniform, the taste of coffee drinks is better, liquid and coffee powder are convenient and efficient to add, and the powder storage barrel and the liquid storage barrel are convenient to clean and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of coffee machines, in particular to a circulating brewing device of a coffee machine. Background Art

[0002] Since coffee powder needs to be brewed and extracted before it can be consumed, the coffee powder brewing and extraction device in the coffee machine is its core component. The performance of the coffee powder brewing and extraction device directly affects the brewing speed and brewing uniformity of the coffee powder, which directly affects the taste and quality of the coffee beverage. Among the existing patents, the Chinese patent document with application number 201710688831.6 discloses a portable coffee machine with circular brewing, including a bottle body, a bracket installed inside the bottle body, a water tank provided at the upper end of the bracket, and a puncture tube provided at the lower end surface of the bracket, a bottle cap connected to the top of the bottle body, a water pump installed at the lower end of the bottle cap, and a water pump pressure cover installed on the top of the water pump, a water pump inlet at the left end of the water pump is connected to a water outlet column through a curved pipe, and the lower end of the water outlet column is connected to the water tank and the water outlet hole, the lower end of the water pump is connected to a water spray pipe through a water pump outlet, and the lower end of the water spray pipe is connected to the bracket. Although this patent document can achieve cyclic brewing and mixing, the brewing and mixing speed is slow, the coffee brewing efficiency is low, and it needs to be used with a disposable K-CUP cup filled with coffee powder, which increases the cost of brewing coffee. When in use, it is necessary to pierce the disposable K-CUP cup filled with coffee powder through the puncture tube and the water spray tube, and then turn the coffee machine upside down before brewing, which is inconvenient to operate. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the present utility model is to provide a circulating brewing device for a coffee machine.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A circulating brewing device for a coffee machine comprises a liquid storage barrel, a sleeve, a rotating shaft, a nozzle, a powder storage barrel and a barrel cover, wherein the powder storage barrel is rotatably arranged in the liquid storage barrel, the sleeve is arranged on the inner wall of the bottom plate of the liquid storage barrel, the rotating shaft comprises a mounting portion, a screw and a shaft rod which are connected in sequence, the shaft rod is rotatably arranged on the bottom plate of the liquid storage barrel in a sealed manner, the screw is rotatably arranged in the sleeve, the spiral groove of the screw and the inner wall of the sleeve are arranged to form a spiral liquid feeding channel, the nozzle is arranged in the middle of the inner wall of the bottom plate of the powder storage barrel, and the nozzle cover is detachably mounted on the mounting portion and It is sealed on the outside of the sleeve, and the inner cavity of the nozzle, the sleeve and the screw are arranged to form a connecting cavity. A plurality of liquid spray holes are arranged on the peripheral side of the nozzle, and the plurality of liquid spray holes are connected with the top end of the spiral liquid feeding channel via the connecting cavity. A through hole is provided at one end of the sleeve close to the bottom plate of the liquid storage barrel, and the inner cavity of the liquid storage barrel is connected with the bottom end of the spiral liquid feeding channel via the through hole. A plurality of brewing holes are provided on the side wall of the powder storage barrel and / or the bottom plate of the powder storage barrel. The barrel cover is detachably covered on the top opening of the liquid storage barrel and the top opening of the powder storage barrel, and the powder storage barrel is rotatably connected to the barrel cover.

[0006] Furthermore, a conical surface is provided at the top of the nozzle, and the liquid spraying hole is concavely arranged inwardly from the conical surface.

[0007] Furthermore, the mounting portion is convexly provided with a connecting key, and the inner cavity of the nozzle is concavely provided with a keyway that is concavely matched with the connecting key.

[0008] Furthermore, an embedded cylinder is formed in the middle of the bottom plate of the liquid storage barrel, and the bottom end of the sleeve is integrally connected with a bearing seat. The bearing seat is embedded in the embedded cylinder, and the first bearing and a sealing ring are embedded in the bearing seat. The shaft rod passes through the inner ring and the sealing ring of the first bearing. The sealing ring is used to seal the gap between the shaft rod and the bearing seat. The shaft rod is rotatably connected to the bearing seat via the first bearing, and the through hole is located at the connection position between the sleeve and the bearing seat.

[0009] Furthermore, a sealing ring is embedded in the side wall of the inner cavity of the nozzle, and the sealing ring is used to seal the gap between the inner wall of the nozzle and the outer wall of the sleeve.

[0010] Furthermore, the barrel cover includes a limiting ring, a cover plate and a cover handle. The cover handle is installed in the middle of the cover plate. The limiting ring is installed at the top of the liquid storage barrel. The limiting ring and the top surface of the liquid storage barrel are arranged to form a rotating groove. The limiting ring is provided with multiple through holes, and the multiple through holes are all connected to the rotating groove. The edge of the cover plate is provided with multiple limiting plates. A limiting plate is moved into the rotating groove through a through hole, and the limiting plate can rotate along the rotating groove.

[0011] Furthermore, the cover handle passes through the cover plate, and a second bearing is sleeved on the bottom end of the cover handle. The powder storage barrel is rotatably connected to the cover handle via the second bearing.

[0012] Furthermore, the cover handle is provided with a limiting step and a clamping groove, the clamping groove is detachably provided with a clamping hoop, and the second bearing is clamped between the limiting step and the clamping hoop.

[0013] Furthermore, the powder storage barrel includes a barrel body and multiple filter screens. The side wall of the barrel body is provided with multiple windows. The multiple filter screens are respectively installed at the multiple windows. The brewing holes are arranged on the filter screens and the bottom wall of the barrel body. The nozzle is installed in the middle of the bottom wall of the barrel body.

[0014] Furthermore, the limiting ring is locked on the liquid storage barrel via a locking piece.

[0015] The beneficial effects of the present utility model are as follows: in actual application, the barrel cover is opened, a certain amount of liquid (such as water, etc.) is added into the liquid storage barrel, a certain amount of coffee powder is added into the powder storage barrel, and then the barrel cover is closed to cover the liquid storage barrel and the powder storage barrel, and then the driver is rotated to drive the shaft to rotate at high speed, so that the rotating shaft rotates at high speed, and the high-speed rotating shaft drives the nozzle and the powder storage barrel to rotate at high speed. As the screw rotates at high speed, the liquid in the liquid storage barrel enters the spiral liquid feeding channel from the through hole, and the liquid is transported upward along the spiral liquid feeding channel to the connecting cavity. The liquid in the connecting cavity is sprayed into the powder storage barrel through the multiple spray holes of the nozzle, so that the liquid is mixed with the coffee powder to brew the coffee powder to form a mixed solution. At the same time, the mixed solution is thrown back into the liquid storage barrel through the brewing hole under the action of centrifugal force, so that the mixed solution in the liquid storage barrel can be brewed cyclically, so that the mixing of the liquid and the coffee powder is more uniform, which is beneficial to improving the taste of the coffee beverage. When liquid and / or coffee powder need to be added, liquid and coffee powder can be added to the liquid storage barrel and powder storage barrel respectively by simply opening the barrel lid, which facilitates the addition of liquid and coffee powder. In addition, when cleaning is required, the powder storage barrel can be removed from the rotating shaft after opening the barrel lid, and the powder storage barrel and the liquid storage barrel can be cleaned. Cleaning and maintenance are convenient, and it is not easy to cause blockage of the liquid spray hole and the brewing hole. The utility model adopts a spiral feeding method to achieve cyclic brewing and mixing, and then the mixed solution in the powder storage barrel is thrown back into the liquid storage barrel through the brewing hole under the action of centrifugal force / rotational force, so that the brewing and mixing of coffee powder and liquid is more uniform, thereby making the coffee beverage taste better, and the addition of liquid and coffee powder is convenient and efficient, and the cleaning and maintenance of the powder storage barrel and the liquid storage barrel are convenient. It is also possible to control the rotation time of the rotating shaft to control the strength of the cyclic brewing coffee, and brew coffee that suits personal taste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the present utility model.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model.

[0018] Figure 3 This is a schematic diagram of the exploded structure of the present invention.

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the barrel cover of the present invention with the limiting ring hidden.

[0020] Description of reference numerals:

[0021] 1. Liquid storage barrel; 2. Sleeve; 3. Rotating shaft; 4. Nozzle; 5. Powder storage barrel; 6. Barrel cover; 7. Mounting part; 8. Screw; 9. Shaft; 10. Spiral liquid delivery channel; 11. Connecting chamber; 12. Liquid spray hole; 13. Through hole; 14. Brewing hole; 15. Conical surface; 16. Connecting key; 18. Embedded barrel; 19. Bearing seat; 20. First bearing; 21. Sealing ring; 22. Sealing ring; 23. Limiting ring; 24. Cover plate; 25. Cover handle; 26. Rotating groove; 27. Through hole; 28. Limiting piece; 29. ​​Second bearing; 30. Limiting step; 31. Slot; 32. Clamp; 33. Barrel body; 34. Filter; 35. Window. DETAILED DESCRIPTION

[0022] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0023] like Figures 1 to 4 As shown, the utility model provides a circulating brewing device of a coffee machine, which includes a liquid storage barrel 1, a sleeve 2, a rotating shaft 3, a nozzle 4, a powder storage barrel 5 and a barrel cover 6. The powder storage barrel 5 is rotatably arranged in the liquid storage barrel 1 at a distance, and the sleeve 2 is arranged on the inner wall of the bottom plate of the liquid storage barrel 1. The rotating shaft 3 includes a mounting portion 7, a screw 8 and a shaft 9 that are coaxially connected in sequence. The shaft 9 is sealed and rotatably arranged on the bottom plate of the liquid storage barrel 1, and the screw 8 is rotatably arranged in the sleeve 2. The spiral groove of the screw 8 and the inner wall of the sleeve 2 are surrounded by a spiral liquid feeding channel 10. The nozzle 4 is arranged in the middle of the inner wall of the bottom plate of the powder storage barrel 5, and the nozzle 4 is detachably covered on the mounting portion 7 and The nozzle 4 is sealedly mounted on the outside of the sleeve 2. The inner cavity of the nozzle 4, the sleeve 2, and the screw 8 form a connecting cavity 11. The nozzle 4 is provided with a plurality of liquid spray holes 12 in an annular array around the side of the nozzle 4. The plurality of liquid spray holes 12 communicate with the top end of the spiral liquid feeding channel 10 via the connecting cavity 11. A through hole 13 is formed at one end of the sleeve 2 near the bottom plate of the liquid storage barrel 1. The inner cavity of the liquid storage barrel 1 communicates with the bottom end of the spiral liquid feeding channel 10 via the through hole 13. The side wall or / and the bottom plate of the powder storage barrel 5 are provided with a plurality of brewing holes 14. The barrel cover 6 is removably fitted over the top openings of the liquid storage barrel 1 and the powder storage barrel 5. The powder storage barrel 5 is rotatably connected to the barrel cover 6. Specifically, the powder storage barrel 5, the nozzle 4, the rotating shaft 3, and the liquid storage barrel 1 are coaxially arranged. The shaft 9 is connected to a rotary actuator for driving the shaft 9 to rotate at high speed. The rotary actuator can be a motor.

[0024] In actual application, the barrel cover 6 is opened, a certain amount of liquid (such as water, etc.) is added into the liquid storage barrel 1, a certain amount of coffee powder is added into the powder storage barrel 5, and then the barrel cover 6 is closed to cover the liquid storage barrel 1 and the powder storage barrel 5. Then, the driver drives the shaft 9 to rotate at high speed, so that the rotating shaft 3 rotates at high speed. The high-speed rotating rotating shaft 3 drives the nozzle head 4 and the powder storage barrel 5 to rotate synchronously at high speed. As the screw 8 rotates at high speed, the liquid in the liquid storage barrel 1 enters the spiral liquid feeding channel 10 from the through hole 13, and the liquid will be transported upward along the spiral liquid feeding channel 10 to the connecting cavity 11. The liquid in the connecting cavity 11 is sprayed into the powder storage barrel 5 through the multiple spray holes 12 of the nozzle head 4, so that the liquid is mixed with the coffee powder to brew the coffee powder to form a mixed solution. At the same time, the mixed solution is thrown back into the liquid storage barrel 1 through the brewing hole 14 under the action of centrifugal force / rotational force, which not only enables the mixed solution in the liquid storage barrel 1 to brew coffee cyclically, but also makes the mixing of the liquid and coffee powder more uniform, which is beneficial to improving the taste of the coffee beverage. When adding liquid and / or coffee powder, simply open the lid 6 to add liquid and coffee powder to the liquid storage tank 1 and powder storage tank 5, respectively, making the addition of liquid and coffee powder convenient. Furthermore, when cleaning is necessary, the lid 6 is opened and the powder storage tank 5 is removed from the rotating shaft 3. This allows for easy cleaning and maintenance, and reduces the risk of clogging the liquid spray hole 12 and brewing hole 14. Furthermore, as the mixed solution spirals upward along the spiral liquid delivery channel 10, it also achieves a more uniform mixed solution. The present invention adopts a spiral feeding method to achieve cyclic brewing and mixing, and the mixed solution in the powder storage barrel 5 is thrown back into the liquid storage barrel 1 through the brewing hole 14 under the action of centrifugal force / rotational force, so that the brewing and mixing of coffee powder and liquid are more uniform, thereby making the coffee beverage taste better, and the addition of liquid and coffee powder is convenient and efficient, the powder storage barrel 5 and the liquid storage barrel 1 are easy to clean and maintain, and the rotation time of the rotating shaft 3 can be controlled to control the strength of the cyclic brewing coffee, so that coffee suitable for personal taste can be brewed.

[0025] Specifically, a heating ring is provided on the bottom surface of the liquid storage barrel 1 , and the heating ring is used to heat the liquid, mixed solution or coffee beverage in the liquid storage barrel 1 .

[0026] In this embodiment, the top of the nozzle 4 is provided with a conical surface 15, and the liquid spray hole 12 is formed by being inclined and recessed inward from the conical surface 15. This structural design allows the liquid to be sprayed from the center of the nozzle 4 to the surrounding areas, which is beneficial for improving the brewing and mixing efficiency of the coffee powder in the powder storage bucket 5.

[0027] Specifically, a plurality of liquid spray holes 12 are distributed in an annular array on the conical surface 15 of the nozzle 4. This structural design is conducive to uniformly spraying liquid into the powder storage barrel 5, so that the brewing and mixing are uniform.

[0028] In this embodiment, the mounting portion 7 is provided with a protruding connection key 16, and the inner cavity of the nozzle 4 is provided with a concave keyway that mates with the connection key 16. When the nozzle 4 is assembled with the rotating shaft 3, the connection key 16 cooperates with the keyway, which not only facilitates and secures the assembly of the nozzle 4 and the rotating shaft 3, but also ensures that the rotating shaft 3 and the nozzle 4 can rotate synchronously.

[0029] In this embodiment, an inserting tube 18 is formed in the middle of the bottom plate of the liquid storage barrel 1 and extends downward. A bearing seat 19 is integrally connected to the bottom end of the sleeve 2. The diameter of the bearing seat 19 is larger than that of the sleeve 2. The bearing seat 19 is sealed (tightly) embedded in the inserting tube 18. The top surface of the bearing seat 19 is no higher than the inner wall of the bottom plate of the liquid storage barrel 1. A first bearing 20 and a sealing ring 21 are embedded in the bearing seat 19. The shaft 9 passes through the inner ring of the first bearing 20 and the sealing ring 21. The sealing ring 21 is used to seal the gap between the shaft 9 and the bearing seat 19. The shaft 9 is rotatably connected to the bearing seat 19 via the first bearing 20. The through hole 13 is located at the connection between the sleeve 2 and the bearing seat 19. Specifically, the sealing ring 21 is located above the first bearing 20. This structural design improves the positioning accuracy and stability of the sleeve 2 because the bearing seat 19 is embedded in the embedding tube 18; the setting of the first bearing 20 improves the rotation stability of the rotating shaft 3; the sealing ring 21 seals the gap between the shaft 9 and the bearing seat 19 to prevent liquid leakage.

[0030] In this embodiment, a sealing ring 22 is embedded in the inner sidewall of the nozzle head 4. The sealing ring 22 is used to seal the gap between the inner wall of the nozzle head 4 and the outer wall of the sleeve 2. This structural design improves the sealing between the nozzle head 4 and the sleeve 2, preventing insufficient spray pressure from the spray hole 12 of the nozzle head 4 due to liquid leakage between the nozzle head 4 and the sleeve 2, and ensuring that the cyclic brewing and mixing can be completed normally.

[0031] In this embodiment, the barrel cover 6 includes a limiting ring 23, a cover plate 24 and a cover handle 25. The cover handle 25 is installed in the middle of the cover plate 24. The limiting ring 23 is installed at the top of the liquid storage barrel 1. The limiting ring 23 and the top surface of the liquid storage barrel 1 are arranged to form a rotation groove 26. The limiting ring 23 is provided with a plurality of through holes 27, and the plurality of through holes 27 are all connected to the rotation groove 26. The edge of the cover plate 24 is protruded with a plurality of limiting pieces 28. A limiting piece 28 is moved into the rotation groove 26 through a through hole 27, and the limiting piece 28 can rotate along the rotation groove 26. In actual application, when the bucket cover 6 opens the liquid storage bucket 1 and the powder storage bucket 5, the limiting ring 23 will be fixed to the top of the liquid storage bucket 1, and the cover handle 25 together with the cover plate 24 will be separated from the limiting ring 23; when it is necessary to cover the bucket cover 6, the cover handle 25 is held and moved together with the cover plate 24 to the top of the liquid storage bucket 1 and the powder storage bucket 5, and the multiple limiting pieces 28 on the cover plate 24 respectively correspond to the multiple through holes 27, and then the cover plate 24 is moved down so that the cover plate 24 is The plurality of limiting pieces 28 are moved into the plurality of through-holes 27 in a one-to-one correspondence, and then the cover handle 25 is rotated to rotate the cover plate 24 along the rotation groove 26, thereby causing the plurality of limiting pieces 28 to rotate in the rotation groove 26, until the plurality of limiting pieces 28 rotate to a position misaligned with the plurality of through-holes 27. The limiting ring 23 can then limit the limiting pieces 28 of the cover plate 24 on the liquid storage barrel 1, so that the cover plate 24 covers the top port of the liquid storage barrel 1 and the top port of the powder storage barrel 5. When it is necessary to open the cover plate 24, the cover handle 25 is driven in the reverse direction to cause the cover plate 24 to rotate in the reverse direction until the plurality of limiting pieces 28 of the cover plate 24 rotate into the plurality of through-holes 27 respectively. The cover handle 25 can then be pulled upward to pull the cover plate 24 away from the limiting ring 23, thereby opening the cover plate 24.

[0032] In this embodiment, the cover handle 25 extends through the cover plate 24. A second bearing 29 is fitted around the bottom end of the cover handle 25. The powder storage bucket 5 is rotatably connected to the cover handle 25 via the second bearing 29. When the cover plate 24 covers the top ports of the liquid storage bucket 1 and the powder storage bucket 5, the powder storage bucket 5 is fitted around the outer ring of the second bearing 29, allowing the powder storage bucket 5 to rotate relative to the cover handle 25, thereby rotating synchronously with the spray head 4.

[0033] In this embodiment, the cover handle 25 is provided with a limiting step 30 and a clamping groove 31. The clamping groove 31 is detachably mounted with a clamping ring 32. The second bearing 29 is sandwiched between the limiting step 30 and the clamping ring 32. This structural design facilitates the assembly and disassembly of the second bearing 29 and improves the positioning accuracy and working stability of the second bearing 29 during assembly.

[0034] In this embodiment, the powder storage barrel 5 includes a barrel body 33 and multiple filters 34. The side wall of the barrel body 33 is provided with multiple windows 35, and the multiple filters 34 are respectively installed in the multiple windows 35. The brewing holes 14 are provided in the filters 34 and the bottom wall of the barrel body 33, and the nozzle 4 is installed in the middle of the bottom wall of the barrel body 33. This structural design realizes the modularization of the powder storage barrel 5, facilitates the production and manufacture of the powder storage barrel 5, and allows the filters 34 to be disassembled for cleaning.

[0035] In this embodiment, the limiting ring 23 is locked on the liquid storage barrel 1 via a locking member. Specifically, the locking member is a bolt. This structural design facilitates the disassembly and assembly of the limiting ring 23 and the liquid storage barrel 1, and the assembly is firm.

[0036] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of protection of the present invention.

Claims

1. A circulating brewing device for a coffee machine, characterized by: The invention comprises a liquid storage barrel (1), a sleeve (2), a rotating shaft (3), a nozzle (4), a powder storage barrel (5) and a barrel cover (6); the powder storage barrel (5) is rotatably arranged in the liquid storage barrel (1); the sleeve (2) is arranged on the inner wall of the bottom plate of the liquid storage barrel (1); the rotating shaft (3) comprises a mounting portion (7), a screw (8) and a shaft (9) connected in sequence; the shaft (9) is rotatably arranged in the bottom plate of the liquid storage barrel (1); the screw (8) is rotatably arranged in the sleeve (2); the spiral groove of the screw (8) and the inner wall of the sleeve (2) are surrounded to form a spiral liquid delivery channel (10); the nozzle (4) is arranged in the middle of the inner wall of the bottom plate of the powder storage barrel (5); the nozzle (4) is detachably covered on the mounting portion (7) and is sealed and sleeved on the sleeve (2). ), the inner cavity of the nozzle (4), the sleeve (2) and the screw (8) are arranged to form a connecting cavity (11), a plurality of liquid spraying holes (12) are arranged on the peripheral side of the nozzle (4), and the plurality of liquid spraying holes (12) are connected to the top end of the spiral liquid feeding channel (10) via the connecting cavity (11), a through hole (13) is provided at one end of the sleeve (2) close to the bottom plate of the liquid storage barrel (1), and the inner cavity of the liquid storage barrel (1) is connected to the bottom end of the spiral liquid feeding channel (10) via the through hole (13), a plurality of brewing holes (14) are provided on the side wall of the powder storage barrel (5) or / and the bottom plate of the powder storage barrel (5), and the barrel cover (6) is detachably covered on the top opening of the liquid storage barrel (1) and the top opening of the powder storage barrel (5), and the powder storage barrel (5) is rotatably connected to the barrel cover (6).

2. The circulating brewing device of a coffee machine according to claim 1, characterized in that: The top end of the nozzle (4) is provided with a conical surface (15), and the liquid spraying hole (12) is formed by being inclined and concave inward from the conical surface (15).

3. The circulating brewing device of a coffee machine according to claim 1, characterized in that: The mounting portion (7) is convexly provided with a connecting key (16), and the inner cavity of the nozzle (4) is concavely provided with a keyway that is concavely and convexly matched with the connecting key (16).

4. The circulating brewing device of a coffee machine according to claim 1, characterized in that: An embedded cylinder (18) is formed in the middle of the bottom plate of the liquid storage barrel (1), and the bottom end of the sleeve (2) is integrally connected with a bearing seat (19). The bearing seat (19) is embedded in the embedded cylinder (18), and a first bearing (20) and a sealing ring (21) are embedded in the bearing seat (19). The shaft (9) passes through the inner ring of the first bearing (20) and the sealing ring (21). The sealing ring (21) is used to seal the gap between the shaft (9) and the bearing seat (19). The shaft (9) is rotatably connected to the bearing seat (19) via the first bearing (20). The through hole (13) is located at the connection position between the sleeve (2) and the bearing seat (19).

5. The circulating brewing device of a coffee machine according to claim 1, characterized in that: A sealing ring (22) is embedded in the inner cavity side wall of the nozzle (4), and the sealing ring (22) is used to seal the gap between the inner wall of the nozzle (4) and the outer wall of the sleeve (2).

6. The circulating brewing device of a coffee machine according to claim 1, characterized in that: The barrel cover (6) comprises a limiting ring (23), a cover plate (24) and a cover handle (25). The cover handle (25) is mounted on the middle of the cover plate (24). The limiting ring (23) is mounted on the top of the liquid storage barrel (1). The limiting ring (23) and the top surface of the liquid storage barrel (1) are arranged to form a rotating groove (26). The limiting ring (23) is provided with a plurality of through holes (27). The plurality of through holes (27) are all connected to the rotating groove (26). The edge of the cover plate (24) is provided with a plurality of limiting pieces (28). One limiting piece (28) moves into the rotating groove (26) through one of the through holes (27). The limiting piece (28) can rotate along the rotating groove (26).

7. The circulating brewing device of a coffee machine according to claim 6, characterized in that: The cover handle (25) passes through the cover plate (24), and a second bearing (29) is sleeved on the bottom end of the cover handle (25). The powder storage barrel (5) is rotatably connected to the cover handle (25) via the second bearing (29).

8. The circulating brewing device of a coffee machine according to claim 7, characterized in that: The cover handle (25) is provided with a limiting step (30) and a clamping groove (31); the clamping groove (31) is detachably provided with a clamping hoop (32); and the second bearing (29) is clamped between the limiting step (30) and the clamping hoop (32).

9. The circulating brewing device of a coffee machine according to claim 1, characterized in that: The powder storage barrel (5) comprises a barrel body (33) and a plurality of filter screens (34). The side wall of the barrel body (33) is provided with a plurality of windows (35). The plurality of filter screens (34) are respectively installed at the plurality of windows (35). The brewing hole (14) is provided on the filter screens (34) and the bottom wall of the barrel body (33). The nozzle (4) is installed in the middle of the bottom wall of the barrel body (33).

10. The circulating brewing device of a coffee machine according to claim 6, characterized in that: The limiting ring (23) is locked on the liquid storage barrel (1) via a locking piece.

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