Coffee maker and brewing head thereof

Abstract

The utility model provides a coffee machine and its brewing head, and the brewing head includes base, water distribution disc and shower, the base is equipped with flow channel and water outlet, and the flow channel is connected with the water outlet, the water distribution disc is installed at the water outlet, and the side of water distribution disc towards the water outlet is concave and is formed with recessed part, and the shower is installed at the water outlet and covers the water distribution disc, wherein, the water outlet is equipped with annular groove, and in the height direction of brewing head, the first height of annular groove is greater than or equal to 1.5 times the second height of recessed part. The coffee machine is equipped with the brewing head, and the brewing head can ensure the sufficient water volume and temperature stability of pre-soaking of coffee powder, prolong the pre-soaking time of coffee powder, and finally improve the extraction effect of coffee powder.

Description

Technical Field

[0001] This utility model relates to the field of coffee brewing equipment technology, specifically to a brewing head and a coffee machine equipped with the brewing head. Background Technology

[0002] As one of the core components of a coffee machine, the brew head's design directly affects the quality of the brewed coffee. For example... Figure 1 As shown, the existing brewing head 9 includes a base 91, a flow-limiting valve body 92, a water inlet valve core 93a, a pre-soaking valve core 93b, a pressure relief valve core 93c, a camshaft 94, a handle 95, a water distribution plate 96, a shower head 97, a first elastic element 98a, a second elastic element 98b, and a third elastic element 98c, etc. The base 91 is provided with an inlet 911, a return outlet 912, a flow channel 913, and an outlet 914; the flow limiting valve body 92 is connected to the base 91, a part of the flow limiting valve body 92 is located inside the base 91, the outer periphery of the flow limiting valve body 92 and the base 91 form a first cavity 99a, the first cavity 99a is connected to the inlet 911 and the return outlet 912, the interior of the flow limiting valve body 92 and the base 91 form a second cavity 99b, the second cavity 99b is connected to the first cavity 99a; the base 91 is also provided with a third cavity 99c, a fourth cavity 99d and a fifth cavity 99e, the third cavity 99c is connected to the second cavity 99b and the fourth cavity 99d, and the fifth cavity 99e is connected to the fourth cavity 99d. The inlet valve core 93a is located in the second cavity 99b and extends into the third cavity 99c. A first elastic element 98a is located in the second cavity 99b, forcing the inlet valve core 93a to block the connection between the second cavity 99b and the third cavity 99c. A camshaft 94 is located in the third cavity 99c and is connected to a handle 95, allowing the handle 95 to rotate the camshaft 94. A pre-impregnation valve core 93b is located in the fourth cavity 99d and extends into the third valve core. A second elastic element 98b is located in the fourth cavity 99d. Inside cavity 99d, the second elastic element 98b forces the pre-impregnation valve core 93b to block the connection between the third cavity 99c and the fourth cavity 99d; the pressure relief valve core 93c and the third elastic element 98c are located inside the fifth cavity 99e, and the third elastic element 98c forces the pressure relief valve core 93c to block the connection between the fourth cavity 99d and the fifth cavity 99e; the flow channel 913 connects the third cavity 99c and the water outlet 914, and the water distribution plate 96 and the shower head 97 are installed at the water outlet 914, with the water distribution plate 96 located between the water outlet 914 and the shower head 97.

[0003] When coffee extraction is needed, turn handle 95 to push the camshaft 94 against the water valve core 93a and start the coffee machine's water pump, connecting the second chamber 99b and the third chamber 99c. Water flows through the first chamber 99a and the second chamber 99b into the third chamber 99c. A portion of the water then flows into the flow channel 913 to the outlet 914 to pre-infuse the coffee grounds. The remaining water pushes against the pre-infusion valve core 93b, connecting the third chamber 99c and the fourth chamber 99d. When the fourth chamber 99d is filled with water... At this time, the water pressure begins to increase. When the water reaches the preset pressure value, the water extracts the coffee powder at the preset pressure. After the extraction of the coffee powder is completed, the handle 95 is rotated in the opposite direction, so that the water inlet valve core 93a blocks the connection between the second chamber 99b and the third chamber 99c. At the same time, the pre-infusion valve core 93b is pushed to push the pressure relief valve core 93c, thereby connecting the fourth chamber 99d with the third chamber 99c and the fifth chamber 99e. At this time, the water in the three chambers and the flow channel 913 is discharged from the drain port 915 at the bottom of the base 91.

[0004] However, the existing base 91 design has the following shortcomings: the outlet 914 has a small space, resulting in a small water storage capacity at the outlet 914. This leads to a short pre-infusion time for coffee powder, unstable pre-infusion temperature, and insufficient water volume, which limits the extraction effect of coffee powder after pre-infusion. Summary of the Invention

[0005] To address the aforementioned problems, the main objective of this invention is to provide a brewing head that provides sufficient pre-soaking water, extends the pre-soaking time, and enhances the extraction effect.

[0006] Another objective of this invention is to provide a coffee machine equipped with the aforementioned brewing head.

[0007] To achieve the main objective of this utility model, this utility model provides a brewing head, including a base, a water distribution plate, and a shower head. The base is provided with a flow channel and a water outlet, the flow channel is connected to the water outlet, the water distribution plate is installed at the water outlet, and a recessed portion is formed on the side of the water distribution plate facing the water outlet. The shower head is installed at the water outlet and covers the water distribution plate. The water outlet is provided with an annular groove, and in the height direction of the brewing head, the first height of the annular groove is greater than or equal to 1.5 times the second height of the recessed portion.

[0008] As can be seen from the above, by designing the annular groove, the water storage space above the water distribution plate is increased, which appropriately extends the pre-infusion time of the coffee powder, stabilizes the pre-infusion temperature, and provides more sufficient water volume, allowing the coffee powder to build up pressure better and improve the extraction effect of the coffee powder after pre-infusion. Furthermore, the annular groove also ensures that the water temperature in the shower head is stable and the water flow is more uniform, improving the extraction stability and keeping the extraction rate at its optimal value.

[0009] A preferred embodiment is that the inner diameter of the annular groove is 0.25 to 0.35 times the diameter of the recess; the outer diameter of the annular groove is 0.9 to 0.98 times the diameter of the recess; and the first height is less than 4 times the second height.

[0010] As can be seen from the above, this design ensures sufficient pre-infusion water, improves the pre-infusion effect of coffee powder, and guarantees the extraction effect of coffee powder.

[0011] A further option is to make the bottom of the annular groove curved.

[0012] As can be seen from the above, this design can, on the one hand, further increase the water storage capacity of the annular groove and slow down the rate of water temperature drop, and on the other hand, facilitate the processing and forming of the annular groove.

[0013] Another preferred embodiment is that the base includes a brewing seat, a pre-infusion valve body, and a pressure relief valve body. The pre-infusion valve body is connected between the lower part of the brewing seat and the pressure relief valve body, and the pressure relief valve body has a drain outlet. The brewing head also includes a flow-limiting valve body, which is installed on the upper part of the brewing seat. A portion of the flow-limiting valve body is located inside the brewing seat. The outer periphery of the flow-limiting valve body and the brewing seat form a first cavity, and the interior of the flow-limiting valve body and the brewing seat form a second cavity. The brewing seat also has a third cavity that communicates with the second cavity, and the flow channel communicates with the third cavity. The brewing seat, the pre-infusion valve body, and the pressure relief valve body are all made of stainless steel.

[0014] As can be seen from the above, compared with the traditional use of brass materials to make brewing bases, pre-preparation valves, pressure relief valves, and flow limiting valves, the cost of using stainless steel materials to make brewing bases, pre-preparation valves, pressure relief valves, and flow limiting valves is lower. At the same time, it can better reduce the rate of temperature drop of the boiling head, achieve better heat preservation effect, and help improve the extraction effect and the stability of water temperature during the extraction process.

[0015] A further embodiment is that a screw hole is provided at the connection between the second cavity and the third cavity; the cooking head also includes a sleeve, which has a cylindrical part and an operating part. The outer periphery of the cylindrical part is provided with a threaded structure, which is threadedly connected to the screw hole, and the operating part is located in the second cavity.

[0016] As can be seen from the above, since the connection between the second and third cavities is relatively deeper than the first and third cavities, and stainless steel has high hardness and strength, by setting a sleeve at the connection between the second and third cavities, on the one hand, when a seal cannot be achieved due to wear, the sealing performance can be ensured by replacing the sleeve, without having to replace the entire brewing seat, thus reducing maintenance costs; on the other hand, it can reduce processing costs and processing difficulty, and achieve processing technology optimization.

[0017] A further design is that the outer contour of the operating part is hexagonal prism-shaped; the side of the operating part facing the flow-limiting valve body is provided with an annular protrusion.

[0018] As can be seen from the above, the outer contour design of the operating part allows the sleeve to be disassembled and assembled using conventional tools, reducing maintenance difficulty; and the annular protrusion on the operating part allows it to better cooperate with the inlet valve core, ensuring a sealing effect and blocking the second and third cavities.

[0019] A further improvement is that the brewing head also includes a sealing gasket, which is fitted onto the cylinder and adjacent to the bottom of the operating section and the second chamber.

[0020] As can be seen from the above, the sealing gasket can further improve the sealing performance of the connection between the sleeve and the brewing seat, ensuring the blocking effect on the second and third cavities.

[0021] A further embodiment includes a brewing head comprising a water inlet valve core, a pre-impregnation valve core, a pressure relief valve core, a camshaft, a handle, a first elastic element, a second elastic element, and a third elastic element. The water inlet valve core is located in the second cavity and extends into the third cavity. The pre-impregnation valve body has a fourth cavity communicating with the third cavity, and the pre-impregnation valve core is located in the fourth cavity and extends into the third cavity. The pressure relief valve body has a fifth cavity communicating with the fourth cavity, and the pressure relief valve core is located in the fifth cavity. The camshaft is located in the third cavity. The handle is located outside the base and connected to the camshaft. The handle can drive the camshaft to rotate, causing the camshaft to drive the water inlet valve core and / or the pre-impregnation valve core to move. The first elastic element is located in the second cavity, forcing the water inlet valve core to block the communication between the second and third cavities. The second elastic element is located in the fourth cavity, forcing the pre-impregnation valve core to block the communication between the third and fourth cavities. The third elastic element is located in the fifth cavity, forcing the pressure relief valve core to block the communication between the fourth and fifth cavities.

[0022] As can be seen from the above, the design allows for the pre-soaking, extraction, and depressurization of coffee grounds through the operation of the handle.

[0023] A further improvement is that the showerhead has through holes, with the number of holes ranging from 700 to 1000 and the diameter of the holes ranging from 0.18 mm to 0.22 mm.

[0024] As can be seen from the above, the structural design of the shower head makes the water flow more even and the extraction effect better compared to the traditional diamond mesh shower head.

[0025] To achieve another objective of this utility model, this utility model provides a coffee machine, which includes the above-mentioned brewing head.

[0026] As can be seen from the above, by setting up the brewing head, the coffee machine can extract coffee powder more effectively. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of an existing brewing head.

[0028] Figure 2 This is a structural diagram of an embodiment of the brewing head of this utility model.

[0029] Figure 3 This is a cross-sectional view of an embodiment of the brewing head of this utility model.

[0030] Figure 4 This is a cross-sectional view of the brewing base of an embodiment of the brewing head of this utility model.

[0031] Figure 5 yes Figure 3 Enlarged view of point A in the middle.

[0032] Figure 6 yes Figure 3 Enlarged view of point B in the middle.

[0033] Figure 7 This is an exploded view of the sleeve and sealing ring of an embodiment of the brewing head of this utility model.

[0034] Figure 8 This is a schematic diagram of the shower head structure of an embodiment of the brewing head of this utility model.

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0036] Example of a brewing head Reference Figure 1 and Figure 2 The brewing head 100 includes a base 1, a flow-limiting valve body 14, a water distribution plate 3, a shower head 4, a sleeve 5, a water inlet valve core 61, a pre-soaking valve core 62, a pressure relief valve core 63, a camshaft 64, a handle 7, a first elastic element 81, a second elastic element 82, and a third elastic element 83.

[0037] The base 1 includes a brewing seat 11, a pre-impregnation valve body 12, and a pressure relief valve body 13. The pre-impregnation valve body 12 is connected between the lower part of the brewing seat 11 and the pressure relief valve body 13, and the pressure relief valve body 13 has a drain outlet 131. The drain outlet 131 can be a separate component or directly formed on the pressure relief valve body 13. In this example, the drain outlet 131 is a separate component and is installed at the bottom of the pressure relief valve body 13.

[0038] The brewing base 11 is provided with an inlet 111, a return outlet 112, a flow channel 113, and an outlet 114. A flow-limiting valve body 14 is installed on the upper part of the brewing base 11, with a portion of the flow-limiting valve body 14 located inside the brewing base 11. A first cavity a is formed between the outer periphery of the flow-limiting valve body 14 and the brewing base 11, and a second cavity b is formed between the interior of the flow-limiting valve body 14 and the brewing base 11. The second cavity b is connected to the first cavity a through a through hole on the flow-limiting valve body 14. The inlet 111 and the return outlet 112 are respectively connected to the first cavity a, and the inlet 111 is located above the return outlet 112, so that the hot water in the water tank of the coffee machine can automatically enter the first cavity a from the inlet 111 through the thermosiphon effect, and then flow back to the water tank from the return outlet, thereby realizing automatic heating and preheating of the brewing base 11.

[0039] In addition, the brewing base 11 is provided with a third cavity c, which is connected to the second cavity b and is also connected to the flow channel 113; the pre-impregnation valve body 12 is provided with a fourth cavity d, which is connected to the third cavity c; the pressure relief valve body 13 is provided with a fifth cavity e, which is connected to the fourth cavity d.

[0040] The water distribution plate 3 is installed at the water outlet 114. The side of the water distribution plate 3 facing the water outlet 114 has a recessed part 31, which is connected to the water outlet 114. The shower head 4 is installed at the water outlet 114 and covers the water distribution plate 3.

[0041] Both the inlet valve core 61 and the first elastic element 81 are installed in the second cavity b, and one end of the inlet valve core 61 extends into the third cavity c, so that the inlet valve core 61 can contact the camshaft 64 to establish linkage between the two. The first elastic element 81 is used to force the inlet valve core 61 to move towards the third cavity c to block the communication between the second cavity b and the third cavity c.

[0042] The pre-impregnated valve core 62 and the second elastic element 82 are both installed in the fourth cavity d, and one end of the pre-impregnated valve core 62 extends into the third cavity c, so that the pre-impregnated valve core 62 can contact the camshaft 64 to establish linkage between the two. The second elastic element 82 is used to force the pre-impregnated valve core 62 to move towards the third cavity c, thereby blocking the communication between the third cavity c and the fourth cavity d.

[0043] The pressure relief valve core 63 and the third elastic element 83 are both installed in the fifth cavity e. The pressure relief valve core 63 can be linked with the pre-impregnation valve core 62, so that the pre-impregnation valve core 62 can press down the pressure relief valve core 63, so that the pressure relief valve core 63 releases the connection between the fourth cavity d and the fifth cavity e, and connects the fourth cavity d and the fifth cavity e. The third elastic element 83 is used to force the pressure relief valve core 63 to move towards the fourth cavity d, so as to block the connection between the fourth cavity d and the fifth cavity e.

[0044] The following is a brief description of the extraction process of coffee powder using the brew head 100: When coffee extraction is needed, turn handle 7 to push the camshaft 64 to push the water valve core 61 and start the coffee machine's water pump, connecting the second chamber b with the third chamber c. At this time, water flows through the first chamber a and the second chamber b into the third chamber c, and then a portion of the water flows into the flow channel 113 to the outlet 114. The water distributed by the water distribution plate 3 and the shower head 4 pre-soaks the coffee powder, and the remaining water pushes the pre-soaking valve core 62, connecting the third chamber c with the fourth chamber d. At this time, the coffee powder is pre-soaked at a first preset pressure.

[0045] When the fourth chamber d is filled with water, the water pressure begins to increase. When the water reaches the second preset pressure, the water extracts the coffee powder at the second preset pressure. After the extraction of the coffee powder is completed, the handle 7 is rotated in the opposite direction, causing the water inlet valve core 61 to move towards the third chamber c under the action of the first elastic element 81, thereby blocking the connection between the second chamber b and the third chamber c. At the same time, the camshaft 64 pushes the pre-infusion valve core 62 towards the fifth chamber e, thereby causing the pressure relief valve core 63 to move towards the drain outlet 131, so that the fourth chamber d connects the third chamber c and the fifth chamber e. At this time, the water in the flow channel 113, the third chamber c, the fourth chamber d, and the fifth chamber e is discharged from the drain outlet 131 at the bottom of the base 1, completing the pressure relief of the brewing head 100.

[0046] Combination Figure 4 and Figure 5 In this embodiment, the brewing seat 11 of the base 1 has an annular groove 1141 at the water outlet 114 to increase the water storage space above the water distribution plate 3, thereby appropriately extending the pre-infusion time of the coffee powder, stabilizing the pre-infusion temperature, and ensuring a more sufficient amount of water for better pressure build-up, thus improving the extraction effect of the coffee powder after pre-infusion. Furthermore, the annular groove 1141 also ensures stable water temperature in the shower head 4, more uniform water flow, and improved extraction stability, thereby maintaining the extraction rate at its optimal value.

[0047] Furthermore, in the height direction of the brewing head 100, the first height H1 of the annular groove 1141 is preferably greater than or equal to 1.5 times the second height H2 of the recessed portion 31; and the first height H1 is preferably less than 4 times the second height H2. In addition, the inner diameter R1 of the annular groove 1141 is 0.25 to 0.35 times the diameter R3 of the recessed portion 31; the outer diameter R2 of the annular groove 1141 is 0.9 to 0.98 times the diameter R3 of the recessed portion 31. This design ensures sufficient pre-infusion water volume, improves the pre-infusion effect of the coffee powder, and ensures the extraction effect of the coffee powder.

[0048] Furthermore, the bottom of the annular groove 1141 is curved. By designing the bottom of the annular groove 1141, on the one hand, the water storage capacity of the annular groove 1141 can be further increased and the water temperature drop rate can be slowed down. On the other hand, the water in the annular groove 1141 can be drained as much as possible to avoid affecting the effect of the next pre-soaking of coffee powder. On the other hand, it also facilitates the processing and shaping of the annular groove 1141.

[0049] Furthermore, the brewing base 11, pre-impregnation valve body 12, pressure relief valve body 13, flow limiting valve body 14, and drain outlet 131 are all made of stainless steel. Compared to the traditional use of brass for the brewing base 11, pre-impregnation valve body 12, pressure relief valve body 13, and flow limiting valve body 14, using stainless steel for these components is not only cheaper, but also better reduces the rate of temperature drop in the boiling head 100, achieving better heat preservation, thereby helping to improve the extraction effect and the stability of water temperature during the extraction process.

[0050] Because the brewing base 11 is made of stainless steel instead of brass, and stainless steel has higher hardness and strength than brass, resulting in greater cutting resistance, the cutting force on the tool during the machining of the brewing base 11 is greater. This makes the tool prone to chipping, deformation, and overheating wear, especially in deep cavity milling scenarios (such as the connection between the second cavity b and the third cavity c). Work hardening will cause the milling cutter to wear easily in the deep cavity. In addition, due to poor heat dissipation, the feed rate and cutting speed need to be reduced during machining. Furthermore, the machining depth usually needs to be controlled within 3 to 5 times the tool diameter; otherwise, the tool is prone to chatter due to insufficient rigidity, which will affect the cavity wall quality and frequently cause tool chipping, deformation, and overheating wear.

[0051] To solve this technical problem, combined with Figure 6 A screw hole 115 is provided at the connection between the second cavity b and the third cavity c. At the same time, the sleeve 5 and the brewing base 11 are detachably installed in a split structure. In this way, on the one hand, when the sleeve 5 cannot achieve a seal due to wear, the sealing performance can be ensured by replacing the sleeve 5, so as not to replace the entire brewing base 11, reducing maintenance costs. On the other hand, the brewing base 11 does not need to be machined into a deep cavity. The machined sleeve 5 can be directly installed on the interface of the screw hole 115, which reduces the processing cost and processing difficulty and optimizes the processing technology.

[0052] Combination Figure 7The sleeve 5 has a cylindrical portion 51 and an operating portion 52. The outer periphery of the cylindrical portion 51 is provided with a threaded structure 511, which allows the cylindrical portion 51 to be threadedly connected to the threaded hole 115 through the threaded structure 511, thereby improving the ease of disassembly and assembly of the sleeve 5 and the brewing base 11, and also helping to improve the sealing performance at the connection between the sleeve 5 and the brewing base 11. The operating portion 52 is located in the second cavity b, and the outer contour of the operating portion 52 is preferably hexagonal prism, so that the sleeve 5 can be disassembled and assembled using conventional tools, reducing the difficulty of maintenance.

[0053] Preferably, the side of the operating part 52 facing the flow limiting valve body 14 is provided with an annular protrusion 521, so that the annular protrusion 521 can better cooperate with the water inlet valve core 61, ensure the sealing effect, and achieve the blocking of the second chamber b and the third chamber c.

[0054] Furthermore, the brewing head 100 also includes a sealing gasket 50, which is sleeved on the cylindrical portion 51 and adjacent to the bottom of the operating portion 52 and the second chamber b. The sealing gasket 50 can further improve the sealing performance of the connection between the sleeve 5 and the brewing base 11, ensuring the blocking effect on the second chamber b and the third chamber c.

[0055] Combination Figure 8 The shower head 4 has through holes 41; preferably, the number of through holes 41 is between 700 and 1000, and the diameter of the through holes 41 is preferably between 0.18 mm and 0.22 mm. In this embodiment, the number of through holes 41 is 876, and the diameter of the through holes 41 is 0.20 mm. This design makes the water output of the shower head 4 more uniform and the extraction effect better compared to the traditional diamond mesh shower head.

[0056] In summary, the design of the brewing head 100 provided by this utility model ensures sufficient pre-soaking water for coffee powder during extraction and extends the pre-soaking time of the coffee powder, ultimately improving the extraction effect of the coffee powder.

[0057] Coffee machine example The coffee machine includes a body, a water tank, and the brewing head described in the above-mentioned brewing head embodiment. The water tank is located inside the body and is connected to the inlet and outlet of the brewing head. The brewing head is mounted on the body via a brewing base. By incorporating the brewing head, the coffee machine achieves better extraction of coffee grounds.

[0058] Finally, it should be emphasized that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A brewing head, including a base, the base being provided with a flow channel and a water outlet, the flow channel being connected to the water outlet; The water distribution plate is installed at the water outlet, and the side of the water distribution plate facing the water outlet has a recessed part. Shower head, the shower head is installed at the water outlet and covers the water distribution plate; Its features are: The water outlet is provided with an annular groove, and in the height direction of the brewing head, the first height of the annular groove is greater than or equal to 1.5 times the second height of the recess.

2. The brewing head according to claim 1, characterized in that: The inner diameter of the annular groove is 0.25 to 0.35 times the diameter of the recessed portion; The outer diameter of the annular groove is 0.9 to 0.98 times the diameter of the recessed portion; The first height is less than 4 times the second height.

3. The brewing head according to claim 2, characterized in that: The bottom of the annular groove is an arc surface.

4. The brewing head according to claim 1, characterized in that: The base includes a brewing seat, a pre-impregnation valve body, and a pressure relief valve body. The pre-impregnation valve body is connected between the lower part of the brewing seat and the pressure relief valve body, and the pressure relief valve body has a drain outlet. The brewing head also includes a flow-limiting valve body, which is installed on the upper part of the brewing base. A portion of the flow-limiting valve body is located inside the brewing base. A first cavity is formed between the outer periphery of the flow-limiting valve body and the brewing base. A second cavity is formed between the interior of the flow-limiting valve body and the brewing base. A third cavity communicating with the second cavity is also provided on the brewing base. The flow channel is communicating with the third cavity. The brewing base, pre-preparation valve body, and pressure relief valve body are all made of stainless steel.

5. The brewing head according to claim 4, characterized in that: A screw hole is provided at the connection between the second cavity and the third cavity; The brewing head also includes a sleeve, which has a cylindrical part and an operating part. The outer periphery of the cylindrical part is provided with a threaded structure, which is threadedly connected to the threaded hole. The operating part is located in the second cavity.

6. The brewing head according to claim 5, characterized in that: The outer contour of the operating part is hexagonal prism-shaped; The operating part has an annular protrusion on the side facing the flow-limiting valve body.

7. The brewing head according to claim 6, characterized in that: The brewing head also includes a sealing gasket, which is sleeved on the cylindrical part and adjacent to the bottom of the operating part and the second cavity.

8. The brewing head according to any one of claims 4 to 7, characterized in that: The brewing head also includes: The inlet valve core is disposed in the second cavity and extends into the third cavity; The pre-impregnated valve core has a fourth cavity communicating with the third cavity, and the pre-impregnated valve core is disposed in the fourth cavity and extends into the third cavity; The pressure relief valve core is disposed in the fifth cavity, which is connected to the fourth cavity. A camshaft, wherein the camshaft is disposed within the third cavity; A handle is located outside the base and connected to the camshaft. The handle can drive the camshaft to rotate, so that the camshaft drives the inlet valve core and / or the pre-preparation valve core to move. A first elastic element is disposed in the second cavity to force the water inlet valve core to block the communication between the second cavity and the third cavity; The second elastic element is disposed in the fourth cavity and forces the prepreg valve core to block the communication between the third cavity and the fourth cavity; A third elastic element is disposed in the fifth cavity and forces the pressure relief valve core to block the communication between the fourth cavity and the fifth cavity.

9. The brewing head according to any one of claims 1 to 7, characterized in that: The shower head has through holes, the number of which is between 700 and 1000, and the diameter of which is between 0.18 mm and 0.22 mm.

10. A coffee machine, characterized in that, Includes the brewing head as described in any one of claims 1 to 9.

Images