Coffee machine and water injection device thereof

Abstract

The utility model discloses a coffee machine and a water injection device thereof. The water injection device comprises a base (1) provided with a water inlet hole (111); the water injection piece (2) is provided with an annular groove (21) located below the water inlet hole (111) and a water injection opening (231) formed in the bottom of the annular groove (21), and the water injection piece (2) is rotationally connected with the base (1); the driving assembly (4) is in transmission connection with the water injection piece (2) and is used for driving the water injection piece (2) to rotate around the axis of the annular groove (21); and the water inlet hole (111) is used for conveying brewing water to the annular groove (21). When the coffee machine with the water injection device is used for brewing coffee, the coffee brewing uniformity can be ensured.

Description

Technical Field

[0001] The utility model relates to the field of electrical equipment, and more specifically, to a coffee machine and a water injection device thereof. Background Art

[0002] The common water injection methods of existing coffee machines are single-hole water injection or multi-hole water injection. The coffee machine with single-hole water injection only uses one water injection hole to inject water into the brewing chamber, and the water injection is uneven and the flow rate is small.

[0003] The coffee machine with multi-hole water injection adopts multiple water injection holes arranged like a shower to inject water into the brewing chamber at the same time. Although the water injection flow is large, the flow distribution of each water injection hole is uneven, and even most of the water injection holes have no water flowing out. Therefore, it is easy to cause uneven water injection of coffee, affecting the quality of coffee brewing. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to improve the uniformity of coffee brewing.

[0005] The present invention provides a water injection device for a coffee machine, which includes:

[0006] A base is provided with a water inlet hole;

[0007] A water injection member, provided with an annular groove located below the water inlet hole and a water injection port arranged at the bottom of the annular groove, and rotatably connected to the base;

[0008] A driving assembly, drivingly connected to the water injection member, and used for driving the water injection member to rotate around the axis of the annular groove;

[0009] Wherein, the water inlet hole is used to transport brewing water to the annular groove.

[0010] In an illustrative embodiment, a plurality of water injection ports are provided, and the plurality of water injection ports are arranged in sequence along the radial direction of the annular groove.

[0011] In an illustrative embodiment, the number of the water injection ports is 2 to 5.

[0012] In an illustrative embodiment, the water injection member also includes a water pumping portion protruding from the bottom surface of the annular groove, and the water pumping portion is located between two adjacent water injection ports, between the inner circumferential surface of the annular groove and the water injection port closest to the inner circumferential surface, and / or between the outer circumferential surface of the annular groove and the water injection port on the outer circumferential surface.

[0013] In an illustrative embodiment, the water pumping part is configured as a flat plate, and a plate surface of the flat plate faces a rotation direction of the water pumping part.

[0014] In an exemplary embodiment, the water injection member further comprises one or more drainage ridges protruding from the bottom surface of the annular groove, and the drainage ridges extend along the circumference of the annular groove;

[0015] In an illustrative embodiment, one or more of the diversion ridges divide the annular groove into a plurality of water channels, and ends of the plurality of water channels are respectively aligned with a plurality of water injection ports.

[0016] In an illustrative embodiment, the water inlet hole can be projected onto a drainage ridge in the vertical direction.

[0017] In an illustrative embodiment, the bottom surface of the annular groove is an inclined surface, and the water injection port is located on the lower side of the bottom surface.

[0018] In an illustrative embodiment, the angle between the bottom surface of the annular groove and the horizontal plane is 3° to 10°.

[0019] In an exemplary embodiment, the lower side of the bottom surface is concave to form a groove, and the cross-sectional area of ​​the groove decreases as the depth of the groove increases;

[0020] The water injection ports correspond to the grooves one by one, and the water injection ports are located at the bottom of the corresponding grooves.

[0021] In an exemplary embodiment, the base includes a substrate, and the substrate covers an opening of the annular groove.

[0022] In an illustrative embodiment, the base plate is provided with an axial hole;

[0023] The water injection member comprises an outer cylinder arranged vertically, an inner cylinder arranged inside the outer cylinder and coaxial with the outer cylinder, and a bottom plate extending from the bottom end of the inner cylinder to the bottom end of the outer cylinder, the outer cylinder, the inner cylinder and the bottom plate enclose the annular groove, the inner cylinder is penetrated through the axial hole, and the water injection port is arranged on the bottom plate;

[0024] The driving assembly is arranged on a side of the base plate facing away from the bottom plate, and comprises a motor and a transmission mechanism which is transmission-connected to the motor and the inner cylinder.

[0025] In an illustrative embodiment, the transmission mechanism includes a gear ring sleeved on the inner cylinder and a gear sleeved on the main shaft of the motor, and the gear is meshed with the gear ring.

[0026] In an illustrative embodiment, the gear ring is snap-connected to the inner cylinder.

[0027] In an exemplary embodiment, a cover is further included, the cover comprising:

[0028] A cover body, covering the side of the base plate facing away from the bottom plate and accommodating the transmission mechanism;

[0029] The core shaft extends from the cover body into the inner cylinder and is clearance-matched with the inner cylinder.

[0030] The present application also proposes a coffee machine, which comprises a housing, a filter assembly and the water injection device as described above;

[0031] The base of the water injection device is installed on the shell, the filter assembly is arranged below the water injection device, and the filter assembly is provided with a brewing cavity for accommodating coffee powder and a feed port arranged at the top of the brewing cavity.

[0032] In an illustrative embodiment, a powder dropping channel is provided on the water injection device or a powder dropping channel is provided on the shell;

[0033] The powder falling channel is used for conveying coffee powder to the brewing chamber.

[0034] In this way, the water inlet hole of the base transports the brewing water to the annular groove of the water injection piece, and the brewing water in the annular groove flows out of the annular groove through the water injection port at the bottom of the annular groove, and falls into the brewing cavity containing coffee powder below. In this process, the driving assembly drives the water injection piece to rotate around the axis of the annular groove, and the water injection port rotates around the axis with the water injection piece. The brewing water in the annular groove can be evenly scattered into the brewing cavity as the water injection port rotates, thereby ensuring the uniformity of coffee brewing.

[0035] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0037] Figure 1 It is a cross-sectional view of a partial structure of a coffee machine in an embodiment of the utility model;

[0038] Figure 2 This is a disassembled schematic diagram of a water injection device in an embodiment of the utility model;

[0039] Figure 3 It is a full cross-sectional schematic diagram of a water injection device in an embodiment of the utility model;

[0040] Figure 4 It is a full cross-sectional schematic diagram of a water injection member in an embodiment of the utility model;

[0041] Figure 5 It is a schematic diagram of the assembly of a water injection member and a driving assembly in an embodiment of the utility model;

[0042] Figure 6 It is a cross-sectional view of a partial structure of another coffee machine in an embodiment of the utility model. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the utility model more clear, the embodiments of the utility model will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0044] like Figure 1 As shown, Figure 1 The partial structure of a coffee machine in an embodiment of the present application is shown. The coffee machine includes a water supply assembly (not shown in the figure), a water injection device 100, a filter assembly 200 and a housing 300.

[0045] like Figure 2 , 3 As shown, the housing 300 is the skeleton structure of the coffee machine. The housing 300 can be a plastic housing 300 or a metal housing 300. A mounting hole can be set on the housing 300. The water injection device 100 is set at the mounting hole of the housing 300.

[0046] The water injection device 100 includes a base 1, a water injection member 2 and a driving assembly 4. The base 1 is connected to the housing 300. The base 1 and the housing 300 are fixedly connected, and the base 1 and the housing 300 can be screwed, welded, bolted or bonded. A connecting portion 12 can be provided on the base 1, and the connecting portion 12 extends upward, and the connecting portion 12 is screwed to the housing 300. The base 1 is provided with a water inlet hole 111. The water inlet hole 111 can extend in the vertical direction and pass through the base 1. The water injection member 2 is rotatably connected to the base 1. An annular groove 21 is provided on the water injection member 2. The annular groove 21 can be a groove configured as a circular ring. The annular groove 21 is located below the water inlet hole 111 of the base 1. The opening of the annular groove 21 faces the water inlet hole 111 of the base 1. The axis of the annular groove 21 is vertically arranged, and the water injection member 2 can rotate relative to the base 1 around the axis of the annular groove 21. The water injection member 2 is also provided with a water injection port 231. The water injection port 231 is provided at the bottom of the annular groove 21. The water injection port 231 can be provided in a circular hole shape. The water injection port 231 penetrates the bottom of the annular groove 21.

[0047] The driving assembly 4 is connected to the water injection piece 2. The driving assembly 4 is used to drive the water injection piece 2 to rotate around the axis of the annular groove 21. In this embodiment, the driving assembly 4 includes a motor 41 and a transmission mechanism 42. The transmission mechanism 42 can be a gear transmission mechanism 42, a belt transmission mechanism 42 or a chain transmission mechanism 42. The transmission mechanism 42 is connected to the motor 41 and the water injection piece 2. The motor 41 is relatively fixed to the base 1. The transmission mechanism 42 transmits the torque output by the motor 41 to the water injection piece 2 to drive the water injection piece 2 to rotate.

[0048] The water supply assembly is connected to the water inlet 111 of the water injection device 100 through a pipe. The water supply assembly is used to deliver brewing water to the water injection device 100. The water supply assembly includes a water tank, a water pump and an electric heater. The water tank is used to contain brewing water. The water inlet of the water pump is connected to the outlet of the water tank through a pipe, and the water outlet of the water pump is connected to the water inlet 111 of the base 1 through a pipe. The electric heater is arranged on the pipeline connecting the water outlet of the water pump and the water inlet 111 of the base 1. The electric heater is used to heat the brewing water output by the water pump to a set temperature, which can be 70°C to 100°C. The water inlet 111 is configured to deliver the brewing water input by the water supply assembly to the annular groove 21 of the water injection member 2.

[0049] like Figure 1 As shown, the filter assembly 200 includes a filter funnel 201. A brewing chamber 204 is provided in the filter funnel 201. The brewing chamber 204 is used to contain coffee powder. A feed inlet 202 is provided at the top of the brewing chamber 204, and a liquid outlet 203 is provided at the bottom of the brewing chamber 204, and the feed inlet 202 is larger than the liquid outlet 203. The filter funnel 201 is arranged below the water injection port 231 of the water injection device 100. The feed inlet 202 of the filter funnel 201 faces the water injection port 231 of the water injection device 100. The feed inlet 202 of the filter device can be a circular opening, and the feed inlet 202 is arranged coaxially with the axis of the annular groove 21.

[0050] In this way, the water supply component injects brewing water into the water inlet hole 111 of the base 1, and the water inlet hole 111 of the base 1 transports the brewing water to the annular groove 21 of the water injection member 2. The brewing water in the annular groove 21 flows out of the annular groove 21 through the water injection port 231 at the bottom of the annular groove 21, and falls into the brewing chamber 204 containing coffee powder below. During this process, the driving component 4 drives the water injection member 2 to rotate around the axis of the annular groove 21, and the water injection port 231 rotates around the axis with the water injection member 2. The brewing water in the annular groove 21 can be evenly scattered into the brewing chamber 204 as the water injection port 231 rotates, thereby ensuring the uniformity of coffee brewing.

[0051] In an illustrative embodiment, Figure 2 , 3As shown, there are multiple water injection ports 231 on the water injection member 2. The multiple water injection ports 231 are arranged on the same side of the annular groove 21 and are arranged in sequence along the radial direction of the annular groove 21. The spacing between two adjacent water injection ports 231 can be the same.

[0052] The multiple water injection ports 231 are sequentially arranged along the radial direction of the annular groove 21, so that water can be discharged from the multiple water injection ports 231 at the same time, thereby increasing the water discharge rate. At the same time, when the multiple water injection ports 231 sequentially arranged along the radial direction of the annular groove 21 rotate synchronously, the water droplets sprayed from the multiple water injection ports 231 to the brewing chamber 204 can cover a wider area, thereby further improving the uniformity of water spraying by the water injection member 2, thereby further improving the uniformity of coffee brewing.

[0053] In an exemplary embodiment, the number of the water injection ports 231 on the water injection member 2 ranges from 2 to 5. The 2 to 5 water injection ports 231 are sequentially arranged along the radial direction of the annular groove 21 .

[0054] When the number of water injection ports 231 is controlled within 2 to 5, it can ensure that the water flow rate of each water injection port 231 is not much different, and brewing water can flow out of each water injection port 231, ensuring the uniformity of water sprinkling by the water injection member 2.

[0055] In an illustrative embodiment, Figure 2 , 3 As shown, the water injection member 2 also includes a water pumping portion 25. The water pumping portion 25 is disposed in the annular groove 21 and on the bottom surface of the annular groove 21. The water pumping portion 25 protrudes from the bottom surface of the annular groove 21. The water pumping portion 25 is located between two adjacent water injection ports 231. The shape of the water pumping portion 25 is not limited. In one embodiment, the difference between the number of the water pumping portions 25 and the number of the water injection ports 231 is 1, and a water pumping portion 25 is disposed between each two adjacent water injection ports 231.

[0056] The pumping part 25 may also be located between the inner circumference of the annular groove 21 and the water injection port 231 closest to the inner circumference of the annular groove 21. The pumping part 25 may also be located between the outer circumference of the annular groove 21 and the water injection port 231 closest to the outer circumference of the annular groove 21.

[0057] The water pumping part 25 rotates together with the water injection part 2. When the water pumping part 25 rotates to below the water inlet hole 111 of the base 1, the water pumping part 25 will collide with the brewing water just input into the annular groove 21 from the water inlet hole 111, and break up the brewing water, thereby improving the uniformity of the distribution of the brewing water in the annular groove 21, and then improving the uniformity of the water flow rate of each water injection port 231, further improving the uniformity of coffee brewing.

[0058] In an exemplary embodiment, the water pumping portion 25 is configured as a flat plate. Two ends of the water pumping portion 25 face two adjacent water inlets 231 respectively. One plate surface of the water pumping portion 25 faces the rotation direction of the water pumping portion 25. The plate surface of the water pumping portion 25 may be perpendicular to the circumference of the annular groove 21.

[0059] Since the water pumping part 25 is constructed as a flat plate, and one plate surface of the water pumping part 25 faces the rotation direction of the water pumping part 25, when the water pumping part 25 rotates, the plate surface of the water pumping part 25 facing the rotation direction hits the brewing water input into the annular groove 21 through the water inlet hole 111, which can disperse the brewing water, thereby further improving the uniformity of distribution of the brewing water in the annular groove 21, and making the water flow rate of each water injection port 231 closer.

[0060] In an illustrative embodiment, the water injection member 2 further includes a drainage rib 26. The drainage rib 26 is disposed in the annular groove 21 and on the bottom surface of the annular groove 21. The drainage rib 26 protrudes from the bottom surface of the annular groove 21. The drainage rib 26 is configured in an arc shape, and the drainage rib 26 extends along the axis of the annular groove. One or more drainage ribs 26 are provided. When a plurality of drainage ribs 26 are provided, two adjacent drainage ribs 26 are spaced apart from each other. The drainage rib 26 divides the annular groove 21 into a plurality of waterways 211. The widths of the waterways 211 may be the same. The number of waterways 211 and the number of water injection ports 231 may be the same. The ends of the plurality of waterways 211 are respectively aligned with the plurality of water injection ports 231.

[0061] When the water-beating part 25 beats the brewing water, the brewing water is spread into multiple water channels 211 and flows along the water channels 211 into the water injection ports 231 aligned with the water channels 211. The water channels 211 drain the brewing water, so that the amount of water flowing from the water channels 211 to each water injection port 231 is as similar as possible, making the water flow rate of each water injection port 231 closer, thereby further improving the uniformity of coffee brewing.

[0062] In an illustrative embodiment, the water inlet hole 111 of the base 1 can be projected onto a drainage ridge 26 in the vertical direction.

[0063] The water flow input from the water inlet 111 to the annular groove 21 can be divided by the drainage rib 26 and flows into different water channels 211, so that the water flow rate of each water injection port 231 is closer, further improving the uniformity of coffee brewing.

[0064] In an illustrative embodiment, Figure 4 As shown, the bottom surface of the annular groove 21 is configured as an inclined surface. The bottom surface of the annular groove 21 is not parallel to the horizontal plane. The angle a between the bottom surface of the annular groove 21 and the horizontal plane is preferably 3° to 10°. The multiple water injection ports 231 are all located on the lower side of the bottom surface of the annular groove 21.

[0065] The brewing water in the annular groove 21 flows from the higher side of the bottom of the annular groove 21 to the lower side of the bottom of the annular groove 21, and the multiple water injection ports 231 are all arranged on the lower side of the bottom of the annular groove 21. The water in the annular groove 21 can flow quickly and evenly to the multiple water injection ports 231, thereby increasing the water outlet flow rate of the water injection ports 231 and reducing the residual brewing water in the annular groove 21.

[0066] In an illustrative embodiment, Figure 4 As shown, the lower side of the bottom surface of the annular groove 21 is concave to form a groove 232. The cross-sectional area of ​​the groove 232 decreases as the depth of the groove 232 increases. The cross-sectional area is the area of ​​the groove 232 on the horizontal cross section. The side wall of the groove 232 is preferably a conical surface, and the angle b between the generatrix of the conical surface and the horizontal plane is 3° to 10°.

[0067] The grooves 232 and the water injection ports 231 are arranged in one-to-one correspondence, and each water injection port 231 is arranged at the bottom of the corresponding groove 232 , and the bottom of the groove 232 is the maximum depth of the groove 232 .

[0068] The groove 232 is formed by a depression on the lower side of the bottom surface of the annular groove 21 . The water injection port 231 is arranged at the bottom of the groove 232 , which can further increase the water flow rate of the water injection port 231 and further reduce the residual brewing water in the annular groove 21 .

[0069] In an exemplary embodiment, the base 1 includes a substrate 11. The substrate 11 may be configured as a circular annular flat plate. The substrate 11 covers the opening of the annular groove 21 and seals the opening.

[0070] The base plate 11 covers the opening of the annular groove 21 , which can prevent the brewing water in the annular groove 21 from overflowing or splashing outward, thereby reducing the potential safety hazard caused by the overflowing or splashing of the brewing water.

[0071] In an illustrative embodiment, the substrate 11 of the base 1 is provided with an axial hole 112. The axial hole 112 is located in the middle of the substrate 11. The axial hole 112 vertically penetrates the substrate 11. The axial hole 112 may be a circular through hole.

[0072] The water injection member 2 includes an outer cylinder 24, an inner cylinder 22 and a bottom plate 23. The outer cylinder 24 and the inner cylinder 22 are both cylindrical. The inner diameter of the outer cylinder 24 is greater than the outer diameter of the inner cylinder 22. The length of the inner cylinder 22 is greater than the length of the outer cylinder 24. The inner cylinder 22 is arranged inside the outer cylinder 24. The inner cylinder 22 and the outer cylinder 24 are arranged coaxially. The inner cylinder 22 and the outer cylinder 24 are both arranged vertically. The bottom ends of the inner cylinder 22 and the outer cylinder 24 are flush. The bottom plate 23 is configured as a circular flat plate or an annular flat plate. The bottom plate 23 extends from the bottom end of the inner cylinder 22 to the bottom end of the outer cylinder 24, and the bottom plate 23 blocks the annular gap between the bottom ends of the inner cylinder 22 and the outer cylinder 24. The water injection ports 231 are all arranged on the bottom plate 23 and penetrate the bottom plate 23. The inner cylinder 22, the outer cylinder 24 and the bottom plate 23 enclose an annular groove 21, and the upward plate surface of the bottom plate 23 is the bottom surface of the annular groove 21. The inner cylinder 22 is inserted into the shaft hole 112 of the base plate 11, and there is a clearance fit between the inner cylinder 22 and the shaft hole 112. The base plate 11 is also located in the outer cylinder 24, and there is a clearance fit between the outer edge of the base plate 11 and the inner circumferential wall of the outer cylinder 24. The base plate 11 can cover the opening of the annular groove 21, and at the same time form a rotation connection with the water injection member 2.

[0073] The driving components 4 are all arranged on the side of the base 1 facing away from the bottom plate 23 of the water injection member 2. The transmission mechanism 42 of the driving mechanism is transmission-connected to the main shaft of the motor 41 and the inner cylinder 22 of the water injection member 2. The transmission mechanism 42 can transmit the torque output by the main shaft of the motor 41 to the inner cylinder 22, so that the inner cylinder 22 can rotate around its own axis.

[0074] In an illustrative embodiment, Figure 5 As shown, the transmission mechanism 42 includes a gear ring 421 and a gear 422. The gear ring 421 is annular in structure, and a plurality of teeth are arranged on the outer circumferential surface of the gear ring 421. The gear ring 421 is sleeved on one end of the inner cylinder 22 facing away from the bottom plate 23. The gear ring 421 and the inner cylinder 22 are fixedly connected. The gear ring 421 and the inner cylinder 22 may be connected by a snap connection. A snap groove 4211 is arranged on the inner edge of the gear ring 421, and the number of the snap grooves 4211 may be multiple, for example, 3. The multiple snap grooves 4211 are evenly distributed in the circumferential direction of the gear ring 421. A plurality of snap buckles 221 are arranged on one end of the inner cylinder 22 facing away from the bottom plate 23, and the number of the snap buckles 221 is the same as the number of the snap grooves 4211. The snap buckles 221 and the snap grooves 4211 are arranged one by one, and each snap buckle 221 is hooked on the snap groove 4211 corresponding to it to realize the snap connection between the gear ring 421 and the inner cylinder 22.

[0075] Of course, a limiting portion extending radially outward is provided on the inner cylinder 22. The limiting portion may be a protrusion. The limiting portion and the bottom plate 23 are respectively located on opposite sides of the base plate 11. The limiting portion cannot pass through the shaft hole 112. The limiting portion can support the water injection piece.

[0076] The gear 422 is sleeved on the main shaft of the motor 41. The gear 422 and the main shaft of the motor 41 may be interference fit or keyed. The gear 422 is arranged on one side of the gear ring 421 and meshes with the gear ring 421. The body of the motor 41 is located on the side of the gear 422 that is away from the substrate 11.

[0077] The motor 41 drives the gear 422 to drive the ring gear 421 to rotate, and when the ring gear 421 rotates, the water injection member 2 is driven to rotate. The transmission mechanism 42 has a simple structure, high transmission efficiency and high reliability. The ring gear 421 and the inner cylinder 22 are connected by a buckle, which is easy to assemble.

[0078] In an illustrative embodiment, Figure 3 As shown, the water injection device 100 also includes a covering member 3. The covering member 3 includes a cover body 31 and a core shaft 32. The cover body 31 covers the side of the base plate 11 of the base 1 that is away from the bottom plate 23 of the water injection member 2. The cover body 31 is fixedly connected to the base 1, and the cover body 31 and the base 1 can be snap-fit ​​connected. The transmission mechanism 42 is accommodated in the cover body 31. In this embodiment, the ring gear 421 and the gear 422 are both accommodated in the cover body 31. The cover body 31 is provided with a through hole 311. The body of the motor 41 is arranged outside the cover body 31 and connected to the cover body 31. The main shaft of the motor 41 is passed through the through hole 311.

[0079] The outer contour of the mandrel 32 is cylindrical. One end of the mandrel 32 is connected to the cover body 31. The mandrel 32 extends vertically downward from the cover body 31 and extends into the inner cylinder 22. The mandrel 32 and the inner cylinder 22 are clearance-fitted.

[0080] The inner cylinder 22 and the core shaft 32 are clearance-matched, and the inner cylinder 22 rotates around the core shaft 32 so that the water injection member 2 can rotate more smoothly. The transmission mechanism 42 is accommodated in the cover body 31, and the cover body 31 can prevent foreign matter from entering the transmission mechanism 42 and causing the transmission mechanism 42 to be stuck.

[0081] In an illustrative embodiment, Figure 1 As shown, the core shaft 32 of the cover 3 is constructed as a hollow shaft. A powder falling channel 321 is provided inside the core shaft 32, and the powder falling channel 321 extends vertically. The powder falling channel 321 is configured to convey coffee powder to the brewing chamber 204. The coffee machine also includes a grinding mechanism. The grinding mechanism is used to grind coffee beans into coffee powder. The powder outlet of the grinding mechanism is connected to the upper end of the powder falling channel 321 of the core shaft 32. After the grinding mechanism grinds the coffee beans into coffee powder, the coffee powder is conveyed to the powder falling channel 321 of the core shaft 32. After the coffee powder enters the powder falling channel 321 of the core shaft 32, it can be conveyed to the brewing chamber 204 of the filter assembly 200 through the powder falling channel 321.

[0082] The powder falling channel 321 can be set above the middle of the feed port 202 of the brewing chamber 204. After the coffee powder falls into the brewing chamber 204 from the powder falling channel 321, it can be evenly distributed in the brewing chamber 204. Then, the brewing water is evenly sprinkled into the brewing chamber 204 through the liquid injection device, which can improve the uniformity of coffee brewing.

[0083] In an illustrative embodiment, Figure 2 , 3 As shown, the water injection device 100 also includes a first sealing ring 6 and a second sealing ring 7. The first sealing ring 6 and the second sealing ring 7 are both configured in an annular shape. The first sealing ring 6 and the second sealing ring 7 can be rubber rings. The first sealing ring 6 is arranged at the outer edge of the substrate 11 of the base 1, and is used to seal the gap between the outer edge of the substrate 11 and the inner peripheral wall of the outer cylinder 24. The second sealing ring 7 is arranged at the inner edge of the substrate 11, and is used to seal the gap between the inner edge of the substrate 11 and the outer peripheral wall of the inner cylinder 22.

[0084] The first sealing ring 6 and the second sealing ring 7 can prevent brewing water from flowing out of the annular groove 21 from the gap between the base plate 11 and the water injection member 2, thereby further improving the sealing performance.

[0085] In an illustrative embodiment, the water injection device 100 further includes a protective shell 5. The protective shell 5 may be made of stainless steel. The protective shell 5 covers the outer surface of the water injection member 2. The protective shell 5 is fixedly connected to the water injection member 2. The protective shell 5 may be snap-fitted to the water injection member 2. Water injection holes 51 are provided on the protective shell 5. The number of water injection holes 51 is the same as the number of water injection ports 231. The water injection holes 51 are provided in a one-to-one correspondence with the water injection ports 231, and the water injection holes 51 are aligned with the corresponding water injection ports 231.

[0086] The protective shell 5 protects the water injection part 2 and can also enhance the texture of the water injection device 100 and improve the user experience.

[0087] In another exemplary embodiment, Figure 6 As shown, a powder falling channel 302 is provided on the housing 300. The powder falling channel 302 is provided on one side of the water injection device 100 and is spaced apart from the water injection device 100. The coffee machine further includes a grinding mechanism. The grinding mechanism is used to grind coffee beans into coffee powder. The powder outlet of the grinding mechanism is connected to the upper end of the powder falling channel 302 of the housing 300. After the grinding mechanism grinds the coffee beans into coffee powder, the coffee powder is transported to the powder falling channel 302 of the housing 300. After the coffee powder enters the powder falling channel 302 of the core shaft 32, it can be transported to the brewing chamber 204 of the filter assembly 200 through the powder falling channel 302.

[0088] The powder falling channel 302 is arranged on one side of the water injection device 100 , so as to prevent water vapor from entering the powder falling channel 302 and causing the powder falling channel 302 to become wet when the water injection port 231 injects water into the brewing chamber 204 .

[0089] In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "relative", "four corners", "periphery", "'mouth'-shaped structure" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0090] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", and "assembly" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; the terms "installation", "connection", and "fixed connection" can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0091] Although the implementation methods disclosed in the utility model are as above, the above contents are only implementation methods adopted to facilitate the understanding of the utility model, and are not used to limit the utility model. Any technician in the field to which the utility model belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the utility model, but the scope of patent protection of the utility model shall still be defined by the attached claims.

Claims

1. A water injection device for a coffee machine, characterized in that: include: A base is provided with a water inlet hole; A water injection member is rotatably connected to the base and is provided with an annular groove located below the water inlet hole and a water injection port arranged at the bottom of the annular groove; A driving assembly, drivingly connected to the water injection member, and used for driving the water injection member to rotate around the axis of the annular groove; Wherein, the water inlet hole is used to transport brewing water to the annular groove.

2. The water injection device according to claim 1, characterized in that: There are multiple water injection ports, which are arranged in sequence along the radial direction of the annular groove.

3. The water injection device according to claim 2, characterized in that: The number of the water injection ports is 2 to 5.

4. The water injection device according to claim 2, characterized in that: The water injection member includes a water pumping portion protruding from the bottom surface of the annular groove, and the water pumping portion is located between two adjacent water injection ports, between the inner circumferential surface of the annular groove and the water injection port closest to the inner circumferential surface, and / or between the outer circumferential surface of the annular groove and the water injection port on the outer circumferential surface.

5. The water injection device according to claim 4, characterized in that: The water pumping part is configured as a flat plate, and one surface of the flat plate faces the rotation direction of the water pumping part.

6. The water injection device according to claim 2, characterized in that: The water injection member includes one or more drainage ridges protruding from the bottom surface of the annular groove, and the drainage ridges extend along the circumference of the annular groove.

7. The water injection device according to claim 6, characterized in that: One or more of the diversion ridges divide the annular groove into a plurality of water channels, and ends of the plurality of water channels are respectively aligned with a plurality of water injection ports.

8. The water injection device according to claim 6, characterized in that: The water inlet hole can be projected onto a drainage ridge in the vertical direction.

9. The water injection device according to claim 1, characterized in that: The bottom surface of the annular groove is an inclined surface, and the water injection port is located on the lower side of the bottom surface.

10. The water injection device according to claim 9, characterized in that: The angle between the bottom surface of the annular groove and the horizontal plane is 3° to 10°.

11. The water injection device according to claim 9, characterized in that: The lower side of the bottom surface is concave to form a groove, and the cross-sectional area of ​​the groove decreases as the depth of the groove increases; The water injection ports correspond to the grooves one by one, and the water injection ports are located at the bottom of the corresponding grooves.

12. The water injection device according to any one of claims 1 to 11, characterized in that: The base comprises a substrate, the water inlet hole is arranged on the substrate, and the substrate covers the opening of the annular groove.

13. The water injection device according to claim 12, characterized in that: The base plate is provided with an axial hole; The water injection member comprises an outer cylinder arranged vertically, an inner cylinder arranged inside the outer cylinder and coaxial with the outer cylinder, and a bottom plate extending from the bottom end of the inner cylinder to the bottom end of the outer cylinder, the outer cylinder, the inner cylinder and the bottom plate enclose the annular groove, the inner cylinder is penetrated through the axial hole, and the water injection port is arranged on the bottom plate; The driving assembly is arranged on a side of the base plate facing away from the bottom plate, and comprises a motor and a transmission mechanism which is transmission-connected to the motor and the inner cylinder.

14. The water injection device according to claim 13, characterized in that: The transmission mechanism comprises a gear ring sleeved on the inner cylinder and a gear sleeved on the main shaft of the motor, and the gear is meshed with the gear ring.

15. The water injection device according to claim 14, characterized in that: The gear ring is snap-connected to the inner cylinder; or, The inner cylinder is provided with a limiting portion which extends radially outward and cannot pass through the axial hole. The limiting portion is arranged on a side of the base plate which is away from the bottom plate, and the limiting portion supports the water injection piece.

16. The water injection device according to claim 13, characterized in that: Also included is a cover, the cover comprising: A cover body, covering the side of the base plate facing away from the bottom plate and accommodating the transmission mechanism; The core shaft extends from the cover body into the inner cylinder and is clearance-matched with the inner cylinder.

17. A coffee machine, characterized in that: It comprises a housing, a filter assembly and a water injection device as claimed in any one of claims 1 to 16; The base is mounted on the shell, the filter assembly is arranged below the water injection port, and the filter assembly is provided with a brewing cavity for accommodating coffee powder and a feed port arranged at the top of the brewing cavity.

18. The coffee machine according to claim 17, characterized in that The water injection device is provided with a powder dropping channel or the shell is provided with a powder dropping channel; The powder falling channel is used for conveying coffee powder to the brewing chamber.

Images