A brew head thermostat system

Abstract

The utility model relates to coffee brewing equipment, the utility model discloses a brewing head constant temperature system, including multiple cavity brewing head and boiler system, multiple cavity brewing head is used for adjusting the temperature of brewing head, and boiler system is used for controlling the temperature of boiler, and three -level regulation mechanism is through rotating cam, and the second jack lifts, makes sealing rod lower cavity and brewing head cavity intercommunication, and water is flowed out from the liquid outlet through the liquid outlet channel through the action of pressure, when homing the cam again, the second jack homing is due to the action of second jack spring, and the connecting port is sealed simultaneously, makes sealing rod lower cavity and brewing head cavity insulate, and the cam will open the second jack of pressure relief under and will the redundant water from the pressure relief mouth leak out when homing.

Description

Technical Field

[0001] This utility model relates to coffee brewing equipment, and more particularly to a brewing head constant temperature system. Background Technology

[0002] An espresso machine is a type of coffee machine. Its principle is to use a mixture of high-pressure steam and water to quickly pass through a coffee filter, instantly extracting the coffee. The resulting coffee is very hot, with low levels of caffeine and other impurities, and has a rich flavor. It typically uses a boiler to generate hot water, which is pressurized to about 9 atmospheres and then flows through a metal filter containing ground coffee beans to brew the coffee. This pressurized hot water brewing produces a stronger coffee than regular coffee and contains emulsified oils; it is commonly called espresso or Italian coffee. There are many types of espresso machines. For commercial use, the most common is the single-boiler type, followed by double-boiler and multi-boiler types, with prices increasing accordingly. Besides the standard electronic control switches, there are also pull-out espresso machines, each with its own advantages and disadvantages.

[0003] In the prior art, our company has applied for a utility model patent with publication number "CN118078109A", which discloses a multi-cavity mixing system with adjustable brewing temperature, mainly disclosing the structure of a saturated constant temperature brewing head. Utility Model Content

[0004] The purpose of this invention is to provide a constant temperature system for the brewing head. By mixing hot and cold liquids in multiple chambers of the multi-chamber brewing head, the water temperature is controlled to be stable, thereby improving the taste of brewed coffee. The boiler system provides initial control of the water temperature, forming a dual temperature control system. This ensures that the water temperature remains stable even when a large number of cups are produced, while also achieving real-time temperature control.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a constant temperature system for the brewing head, including a multi-cavity brewing head and a boiler system;

[0006] The aforementioned heavy-cavity brewing head is used to regulate the temperature of the brewing head, including a primary regulating mechanism, comprising a low-temperature water outlet, a hot water inlet, and a heating element. The heating element is located between the low-temperature water outlet and the hot water inlet in the height direction, and the water inlet flow rate of the low-temperature water outlet and the hot water inlet is adjustable.

[0007] The heating pot has a mixing chamber, wherein the low-temperature water outlet is connected to the mixing chamber and is located above the mixing chamber, and the hot water inlet is connected to the mixing chamber and is located below the mixing chamber.

[0008] A sealing rod is located on one side of the mixing chamber of the heating pot. The sealing rod has an upper mixing chamber and a lower mixing chamber inside. The upper mixing chamber is located at the top of the lower mixing chamber and is arranged around the circumference of the sealing rod. The lower mixing chamber is located at the bottom of the sealing rod. A water inlet is provided on the side of the sealing rod. The two ends of the water inlet are respectively connected to the upper mixing chamber and the mixing chamber of the heating pot.

[0009] The secondary adjustment mechanism includes a water outlet, a mixing channel, and an adjustment needle. The water outlet is located at the top of the sealing rod. The mixing channel communicates downward with the upper mixing chamber at the top of the sealing rod in the height direction. The mixing channel also communicates downward with the lower mixing chamber at the center of the sealing rod in the height direction. The water outlet is located at the center position above the sealing rod. The adjustment needle moves in and out of the water outlet in the height direction to adjust the gap of the water outlet.

[0010] The boiling head chamber is connected to the lower mixing chamber at its top. The boiling head chamber 5) is located below the sealing rod and is provided with a liquid outlet.

[0011] The three-stage adjustment mechanism includes a second push rod, a second push rod spring, a cam, and a stop for limiting the cam. The second push rod is located below the brewing head chamber, and the second push rod spring is sleeved on the second push rod, causing the second push rod to engage with the outer contour of the cam to control pressure relief.

[0012] The mixing channel includes a first through hole and a second through hole sequentially disposed at the bottom of the sealing rod. The sealing rod, the first through hole, and the second through hole are concentrically arranged. A first push rod is disposed between the first through hole and the second through hole. The first push rod has a first step that mates with the first through hole and a second step that mates with the second through hole. A first push rod spring is disposed between the second step and the second through hole.

[0013] The three-stage adjustment mechanism works by rotating a cam, which lifts the second push rod, connecting the lower cavity of the sealing rod to the brewing head cavity. Pressure forces water to flow from the outlet through the outlet channel. When the cam is rotated back to its original position, the second push rod spring returns it to its original position, simultaneously sealing the connection and isolating the lower cavity of the sealing rod from the brewing head cavity. Upon returning to its original position, the cam opens the lower pressure-relieving second push rod, allowing excess water to drain from the pressure-relieving port.

[0014] The boiler system is used to control the temperature of the boiler and includes a mother boiler and a daughter boiler. The mother boiler has a heating function, and the daughter boiler is set inside the mother boiler. The daughter boiler is equipped with a water inlet, a cold water inlet, and a hot water outlet. The water inlet is connected to the cold water inlet, the cold water inlet is connected to the low-temperature water outlet, and the hot water outlet is connected to the hot water inlet.

[0015] Preferably, a water guide pipe is provided on the low-temperature water outlet, the water guide pipe extends horizontally into the mixing chamber of the heating pot, and a water guide hole is provided on the water guide pipe facing downwards, with the water guide hole facing the hot water inlet.

[0016] By adopting the above technical solution, the water pipe extends into the mixing chamber of the heating pot and is opposite to the upward-facing hot water inlet, ensuring that the exchange and mixing of hot and cold water are achieved in the middle of the mixing chamber of the heating pot. This allows the cold water flow and the hot water flow to collide. At the same time, because the hot water has a lower density, it can flow upward and upward to the liquid in the mixture during the subsequent replenishment of hot water, making the mixing more thorough.

[0017] Preferably, the hot water inlet is located at the bottom of the mixing chamber of the heating pot, and the hot water inlet is vertically positioned.

[0018] Preferably, the water inlet holes are evenly distributed around the circumference of the sealing rod, and at least four water inlet holes are provided.

[0019] Preferably, the bottom of the adjusting pin is provided with a tapered surface, and the adjusting handle controls the rotation of the adjusting pin, so that the adjusting pin moves up and down in the height direction.

[0020] By adopting the above technical solution, the adjusting needle can be moved up and down by controlling the adjusting handle, so that a certain gap is formed between the adjusting needle and the outlet of the sealing rod. By adjusting the size of the gap, the liquid in the upper mixing chamber can be allowed to enter the lower mixing chamber by a variable amount or pressure, thereby increasing the water temperature control stage.

[0021] Preferably, a connecting hole is provided between the top of the brewing head cavity and the lower mixing cavity, and a fixed shaft that mates with the connecting hole is provided at the bottom of the first push rod, with the end of the fixed shaft located inside the brewing head cavity.

[0022] Preferably, the device also includes a housing, wherein the heating pot mixing chamber is located on the right side of the housing and extends to the middle of the housing, the sealing rod is located above the middle of the housing, and the cooking head chamber is located below the middle of the housing.

[0023] Preferably, a sealing groove is provided on the outer side below the sealing rod, the sealing groove surrounds the sealing rod, a sealing ring is provided in the sealing groove, the sealing ring abuts against the inner wall of the housing, and a sealing block is provided inside the housing at the position of the connecting hole, the sealing block is concentric with the connecting hole, and the top of the sealing block abuts against the bottom of the first top rod.

[0024] By adopting the above technical solution, the sealing block increases the contact area between the lower mixing chamber and the bottom of the sealing rod. The sealing groove and the sealing ring cooperate to prevent liquid from entering the lower mixing chamber from the heating pot mixing chamber. At the same time, it facilitates installation and plays a positioning role for the sealing rod and the shell during installation.

[0025] Preferably, the cold water inlet is located at the top of the sub-boiler, and the hot water outlet is located at the bottom of the sub-boiler.

[0026] In summary, this multi-cavity brewing head has the following effects;

[0027] Multiple temperature controls

[0028] This invention provides a dual temperature control system, namely, the boiler system provides the first level of temperature control and the multi-cavity mixing system provides the second level of temperature control, thereby maintaining a stable water temperature when dispensing a large number of cups and being able to control the temperature of the brewing head in real time.

[0029] Temperature regulation effect

[0030] First, a water guide pipe is set at the low-temperature water outlet, and the water guide pipe extends to the middle of the mixing chamber of the heating pot, so that the hot and cold water can be mixed in the middle of the heating pot. This provides a larger mixing space than existing technologies, and the temperature adjustment is faster when the hot and cold water flow is adjusted.

[0031] Secondly, the water pipe is designed with downward-facing water inlets, while the hot water inlet is positioned upwards. Hot water, being less dense, flows upwards, while cold water, being more dense, flows downwards, creating convection between the two and improving the mixing effect.

[0032] Third, the water guide hole and the hot water inlet are offset by a certain distance in both height and horizontal direction, which generates a vortex in the middle of the mixing chamber of the heating pot during the flow process, making the temperature adjustment faster.

[0033] Fourth, by adjusting the handle to control the rotation and elevation of the adjusting needle, the gap of the water outlet is controlled, and the amount and pressure of hot water entering the lower mixing chamber are adjusted, thus achieving the function of temperature regulation;

[0034] constant temperature,

[0035] First, the outer side of the sealing rod of the upper mixing chamber has a heat-conducting function, and the hot water in the mixing chamber of the heating pot plays a role in maintaining a constant temperature in the upper mixing chamber.

[0036] Secondly, the mixing channel at the top of the upper mixing chamber and the hot water in the external heating pot transfer temperature through the sealing rod, achieving a double constant temperature effect during the hot water flow process;

[0037] Third, in the downward structure of the mixing channel, the outer upper mixing chamber transmits temperature to the central mixing channel through the inner wall of the sealing rod, achieving a triple constant temperature effect.

[0038] Fourth, after passing through the upper mixing chamber, the outer heating pot mixing chamber transfers the temperature of the hot water flowing in the mixing channel through the outer wall of the sealing rod, achieving a quadruple constant temperature effect.

[0039] To avoid temperature interference, the heating pot's mixing chamber, upper mixing chamber, lower mixing chamber, and brewing head chamber are independently set up during the hot water flow process, and heat preservation is carried out step by step to prevent the temperature in the heating pot's mixing chamber from affecting the temperature of the subsequent chambers;

[0040] Regulate pressure,

[0041] The three-stage adjustment mechanism works by rotating a cam to lift the second push rod, connecting the lower cavity of the sealing rod to the brewing head cavity. Pressure forces water out through the outlet and channel. When the cam is rotated back to its original position, the second push rod spring returns it to its original position, simultaneously sealing the connection and isolating the lower cavity of the sealing rod from the brewing head cavity. Upon returning to its original position, the cam pushes open the lower pressure relief second push rod, releasing excess water from the pressure relief port.

[0042] The existing heating method uses a heating element located inside the heating pot. The temperature inside the heating pot is relatively complex and unstable at different points. The residual heat on the surface of the heating element also affects the final temperature. Therefore, this invention uses a multi-cavity mixing method, which mixes the upper mixing chamber of the sealing rod, the lower mixing chamber of the sealing rod, and the brewing head cavity, to make the temperature of the brewing head more stable, thereby extracting coffee with a better taste. Attached Figure Description

[0043] Figure 1 This is an overall schematic diagram of the embodiment;

[0044] Figure 2 This is a cross-sectional schematic diagram of an embodiment;

[0045] Figure 3 yes Figure 2 An enlarged schematic diagram of part A is shown below;

[0046] Figure 4 yes Figure 2 An enlarged schematic diagram of part B is shown below;

[0047] Figure 5 yes Figure 2 An enlarged schematic diagram of section C is shown below;

[0048] Figure 6 yes Figure 2 The enlarged schematic diagram of part D is shown below;

[0049] In the diagram: 0. Shell; 11. Low-temperature water outlet; 12. Water guide pipe; 13. Water guide hole; 14. Hot water inlet; 15. Heating element; 2. Heating pot mixing chamber; 3. Sealing rod; 31. Upper mixing chamber; 32. Water inlet; 33. Lower mixing chamber; 34. Sealing groove; 35. Sealing ring; 36. Sealing block; 4. Secondary adjustment mechanism; 41. Water outlet; 42. Mixing channel; 43. First through hole; 44. Second through hole; 45. First push rod; 46. First step; 47. Second step; 48. First push rod spring; 49. Adjusting needle; 5. Cooking head chamber; 51. Stop block; 52. Connecting hole; 53. Fixed shaft; 54. Liquid outlet; 6. Tertiary adjustment mechanism; 61. Second push rod; 62. Second push rod spring; 63. Cam; 7. Mother boiler; 8. Daughter boiler; 81. Cold water inlet; 82. Hot water outlet. Detailed Implementation

[0050] The present invention will be further described in detail below with reference to the accompanying drawings.

[0051] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0052] Example:

[0053] like Figures 1 to 6 As shown, the brewing head constant temperature system includes a multi-cavity brewing head and a boiler system. The multi-cavity brewing head is used to regulate the temperature of the brewing head and includes a housing 0. The housing 0 includes, in sequence, a heating pot mixing chamber 2, a sealing rod 3, and a brewing head chamber 5. The heating pot mixing chamber 2 is located on the right side of the housing 0 and extends to the middle of the housing 0. The sealing rod 3 is located above the middle of the housing 0, and the brewing head chamber 5 is located below the middle of the housing 0.

[0054] like Figure 3 As shown, the heating pot mixing chamber 2 is equipped with a primary adjustment mechanism, including a low-temperature water outlet 11, a hot water inlet 14, and a heating element 15. The heating element 15 is located between the low-temperature water outlet 11 and the hot water inlet 14 in the height direction. The water inlet volume of the low-temperature water outlet 11 and the hot water inlet 14 is adjustable. The low-temperature water outlet 11 is connected to the heating pot mixing chamber 2 and is located above the heating pot mixing chamber 2. The hot water inlet 14 is connected to the heating pot mixing chamber 2 and is located below the heating pot mixing chamber 2.

[0055] like Figure 2 and Figure 3As shown, a water guide pipe 12 is provided on the low-temperature water outlet 11. The water guide pipe 12 extends horizontally into the heating pot mixing chamber 2. A water guide hole 13 is provided downward on the water guide pipe 12. The water guide hole 13 is set towards the hot water inlet 14. At the same time, the hot water inlet 14 is set at the bottom of the heating pot mixing chamber 2 and is set vertically.

[0056] like Figures 4 to 6 As shown, the sealing rod 3 is located on one side of the heating pot mixing chamber 2. The sealing rod 3 has an upper mixing chamber 31 and a lower mixing chamber 33. The upper mixing chamber 31 is located on the outer side of the top of the lower mixing chamber 33 and is arranged around the circumference of the sealing rod 3. The lower mixing chamber 33 is located at the bottom of the sealing rod 3. The side of the sealing rod 3 has a water inlet hole 32. The two ends of the water inlet hole 32 are connected to the upper mixing chamber 31 and the heating pot mixing chamber 2, respectively. The water inlet holes 32 are evenly distributed around the circumference of the sealing rod 3, and there are four water inlet holes 32.

[0057] like Figure 4 As shown, in order to connect the upper mixing chamber 31 and the lower mixing chamber 33, a secondary adjustment mechanism 4 is provided at this position. The secondary adjustment mechanism 4 includes a water outlet 41, a mixing channel 42, and an adjustment needle 49. The water outlet 41 is located at the top of the sealing rod 3. The mixing channel 42 is connected to the upper mixing chamber 31 from the top of the sealing rod 3 in the height direction, and is connected to the lower mixing chamber 33 from the center of the sealing rod 3 in the height direction. The water outlet 41 is located at the center position above the sealing rod 3. The adjustment needle 49 moves in and out of the water outlet 41 in the height direction to adjust the gap of the water outlet 41. The bottom of the adjustment needle 49 is provided with a conical surface. The adjustment handle controls the rotation of the adjustment needle 49, so that the adjustment needle 49 moves up and down in the height direction.

[0058] like Figures 1 to 6 As shown, a connecting hole 52 is provided between the top of the brewing head cavity 5 and the lower mixing cavity 33. A fixed shaft 53 that cooperates with the connecting hole 52 is provided at the bottom of the first push rod 45. The end of the fixed shaft 53 is located inside the brewing head cavity 5. The first push rod spring 48 drives the first push rod 45 at the bottom to rise and fall, so that the fixed shaft 53 enters and exits the connecting hole 52, thereby controlling the connection and disconnection between the brewing head cavity 5 and the lower mixing cavity 33.

[0059] like Figure 6 As shown, a sealing groove 34 is provided on the outer circumferential surface below the sealing rod 3. The sealing groove 34 surrounds the sealing rod 3. A sealing ring 35 is provided inside the sealing groove 34. The sealing ring 35 abuts against the inner wall of the housing 0. A sealing block 36 is provided inside the housing 0 at the position of the connecting hole 52. The sealing block 36 is annular and is concentric with the connecting hole 52. The top of the sealing block 36 abuts against the bottom of the first push rod 45.

[0060] like Figure 2 and Figure 3As shown, the housing 0 has a brewing head chamber 5 at the bottom of the sealing rod 3. The top of the brewing head chamber 5 is connected to the lower mixing chamber 33. The brewing head chamber 5 is located below the sealing rod 3 and has an outlet 54. The housing 0 has a three-stage adjustment mechanism 6 inside the brewing head chamber 5. The three-stage adjustment mechanism 6 includes a second push rod 61, a second push rod 61 spring, and a cam 63. The second push rod 61 is located at the outlet 54. The second push rod 61 spring is sleeved on the second push rod 61 and the outer contour of the second push rod 61 cooperates with the cam 63 to control the gap of the outlet 54. The top of the brewing head chamber 5 is connected to the lower mixing chamber 33. The brewing head chamber 5 is located below the sealing rod 3 and has an outlet 54. The three-stage adjustment mechanism 6 includes a second push rod 61, a second push rod 61 spring ... The second push rod 61 is located below the brewing head cavity 5), and the second push rod spring 62 is sleeved on the second push rod 61 and makes the second push rod 61 cooperate with the outer contour of the cam 63 to control the pressure relief. The mixing channel 42 includes a first through hole 43 and a second through hole 44 arranged sequentially at the bottom of the sealing rod 3. The sealing rod 3, the first through hole 43 and the second through hole 44 are arranged concentrically. A first push rod 45 is arranged between the first through hole 43 and the second through hole 44. A first step 46 that cooperates with the first through hole 43 is arranged on the first push rod 45. A second step 47 that cooperates with the second through hole 44 is arranged on the first push rod 45. A first push rod spring 48 is arranged between the second step 47 and the second through hole 44.

[0061] like Figures 1 to 6 As shown, a connecting hole 52 is provided between the top of the brewing head cavity 5 and the lower mixing cavity 33. A fixed shaft 53 that cooperates with the connecting hole 52 is provided at the bottom of the first push rod 45. The end of the fixed shaft 53 is located inside the brewing head cavity 5. The first push rod spring 48 drives the first push rod 45 at the bottom to rise and fall, so that the fixed shaft 53 enters and exits the connecting hole 52, thereby controlling the connection and disconnection between the brewing head cavity 5 and the lower mixing cavity 33.

[0062] like Figure 1 As shown, the boiler system is used to control the boiler temperature and includes a mother boiler 7 and a daughter boiler 8. The mother boiler 7 has a heating function, and the daughter boiler 8 is located inside the mother boiler 7. The daughter boiler 8 is provided with a water inlet, a cold water inlet 81, and a hot water outlet 82. The water inlet is connected to the cold water inlet 81, the cold water inlet 81 is connected to the low temperature water outlet 11, and the hot water outlet 82 is connected to the hot water inlet 14. The cold water inlet 81 is located at the top of the daughter boiler 8, and the hot water outlet 82 is located at the bottom of the daughter boiler 8.

[0063] Working principle:

[0064] The mother boiler 7 heats the water in the daughter boiler 8 to produce hot water. The hot water enters the daughter boiler 8 from the hot water outlet 82 to the hot water inlet 14, and then enters the heating pot mixing chamber 2 from the bottom. The cold water entering from the inlet can also be directly connected to the cold water inlet 81 of the daughter boiler 8. Thus, the cold water flows from the cold water inlet 81 through the low-temperature water outlet 11 and enters the heating pot mixing chamber 2 through the water guide pipe 12, where it mixes and is heated by the heating tube 15 to maintain a constant internal temperature. The hot water in the heating pot mixing chamber 2 can be evenly mixed inside the mixing chamber 31 on the sealing rod 3 through the four water inlets 32 at the front, back, left, and right. There is a straight outlet at the top. The adjusting needle 49 has a certain taper. By adjusting the handle, the adjusting needle 49 is rotated and moved up and down to form a certain gap between the adjusting needle 49 and the water outlet 41 of the sealing rod 3. The water in the mixing chamber 31 of the sealing rod 3 can enter the lower mixing chamber 33 of the sealing rod 3 at a variable flow rate / pressure by adjusting the gap between them. By rotating the cam 63 to lift the fixed shaft 53, the lower mixing chamber 33 of the sealing rod 3 is connected to the brewing head chamber 5 for further mixing. Finally, hot water flows out of the brewing head under pressure. When pressure adjustment is required, the three-stage adjustment mechanism 6 lifts the second push rod 61 by rotating the cam 63, so that the lower chamber of the sealing rod 3 is connected to the brewing head chamber 5. Water flows out from the outlet 54 through the outlet channel under pressure. When the cam 63 is rotated back to its original position, the second push rod 61 is returned to its original position due to the action of the second push rod spring 62, and the connection port is sealed to isolate the lower chamber of the sealing rod 3 from the brewing head chamber. When returning to its original position, the cam 63 pushes open the lower pressure relief second push rod 61 to release excess water from the pressure relief port.

Claims

1. A constant temperature system for a brewing head, characterized in that, The system includes a multi-cavity cooking head and a boiler system. The multi-cavity cooking head is used to regulate the temperature of the cooking head and includes a primary regulating mechanism. The primary regulating mechanism includes a low-temperature water outlet (11), a hot water inlet (14), and a heating element (15). The heating element (15) is located between the low-temperature water outlet (11) and the hot water inlet (14) in the height direction. The water inlet flow of the low-temperature water outlet (11) and the hot water inlet (14) is adjustable. The heating pot mixing chamber (2) is connected to the low-temperature water outlet (11), which is located above the heating pot mixing chamber (2). The hot water inlet (14) is connected to the heating pot mixing chamber (2), which is located below the heating pot mixing chamber (2). A sealing rod (3) is located on one side of the heating pot mixing chamber (2). The sealing rod (3) is provided with an upper mixing chamber (31) and a lower mixing chamber (33). The upper mixing chamber (31) is located at the top of the lower mixing chamber (33). The upper mixing chamber (31) is arranged around the circumference of the sealing rod (3). The lower mixing chamber (33) is located at the bottom of the sealing rod (3). A water inlet hole (32) is provided on the side of the sealing rod (3). The two ends of the water inlet hole (32) are respectively connected to the upper mixing chamber (31) and the heating pot mixing chamber (2). The secondary adjustment mechanism (4) includes a water outlet (41), a mixing channel (42), and an adjustment needle (49). The water outlet (41) is located at the top of the sealing rod (3). The mixing channel (42) is connected to the upper mixing chamber (31) at the top of the sealing rod (3) in the height direction. The mixing channel (42) is connected to the lower mixing chamber (33) at the center of the sealing rod (3) in the height direction. The water outlet (41) is located at the center position above the sealing rod (3). The adjustment needle (49) moves in and out of the water outlet (41) in the height direction to adjust the gap of the water outlet (41). The boiling head chamber (5) is connected to the lower mixing chamber (33) at its top. The boiling head chamber (5) is located below the sealing rod (3). The boiling head chamber (5) is provided with a liquid outlet (54). The three-stage adjustment mechanism (6) includes a second push rod (61), a second push rod spring (62), a cam (63), and a stop (51) for limiting the cam. The second push rod (61) is located below the brewing head cavity (5). The second push rod spring (62) is sleeved on the second push rod (61) and makes the outer contour of the second push rod (61) cooperate with the outer contour of the cam (63) to control the pressure relief. The mixing channel (42) includes a first through hole (43) and a second through hole (44) sequentially disposed at the bottom of the sealing rod (3). The sealing rod (3), the first through hole (43), and the second through hole (44) are concentrically disposed. A first push rod (45) is disposed between the first through hole (43) and the second through hole (44). A first step (46) is disposed on the first push rod (45) to cooperate with the first through hole (43). A second step (47) is disposed on the first push rod (45) to cooperate with the second through hole (44). A first push rod spring (48) is disposed between the second step (47) and the second through hole (44). The three-stage adjustment mechanism (6) works by rotating the cam (63) to lift the second push rod (61), making the lower cavity of the sealing rod (3) communicate with the brewing head cavity (5). Water flows out from the outlet (54) through the outlet channel under pressure. When the cam (63) is rotated back to its original position, the second push rod (61) returns to its original position due to the action of the second push rod spring (62), and at the same time seals the connection port, isolating the lower cavity of the sealing rod (3) from the brewing head cavity. When it returns to its original position, the cam (63) pushes open the pressure relief second push rod (61) below, allowing excess water to be released from the pressure relief port. The boiler system is used to control the temperature of the boiler and includes a mother boiler (7) and a daughter boiler (8). The mother boiler (7) has a heating function. The daughter boiler (8) is located inside the mother boiler (7). The daughter boiler (8) is provided with a water inlet, a cold water inlet (81) and a hot water outlet (82). The water inlet is connected to the cold water inlet (81). The cold water inlet (81) is connected to the low temperature water outlet (11). The hot water outlet (82) is connected to the hot water inlet (14).

2. The constant temperature system for the brewing head according to claim 1, characterized in that: A water guide pipe (12) is provided on the low-temperature water outlet (11). The water guide pipe (12) extends horizontally into the mixing chamber (2) of the heating pot. A water guide hole (13) is provided on the circumference of the water guide pipe (12). The water guide hole (13) is set towards the hot water inlet (14).

3. The constant temperature system for the brewing head according to claim 1, characterized in that: The hot water inlet (14) is located at the bottom of the mixing chamber (2) of the heating pot, and the hot water inlet (14) is vertically arranged.

4. The constant temperature system for the brewing head according to claim 1, characterized in that: The water inlet holes (32) are evenly distributed around the sealing rod (3), and at least four water inlet holes (32) are provided.

5. The constant temperature system for the brewing head according to claim 1, characterized in that: An adjustment handle is provided above the adjustment needle (49), and a tapered surface is provided at the bottom of the adjustment needle (49). The adjustment handle controls the rotation of the adjustment needle (49), so that the adjustment needle (49) moves up and down in the height direction.

6. The constant temperature system for the brewing head according to claim 1, characterized in that: The cold water inlet (81) is located at the top of the sub-boiler (8), and the hot water outlet (82) is located at the bottom of the sub-boiler (8).

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