Coffee machine

Abstract

The utility model relates to a coffee machine which comprises a preparation unit comprising a heating device and a brewing head, the heating device is provided with a heating cavity, and the water outlet end of the heating device is communicated with the brewing head; the water supply unit comprises an external water source, a water tank and a first water pump, the input end of the first water pump selectively communicates with the water tank or the external water source through a pipeline, and the first water pump is used for supplying water to the heating cavity; the pressure regulating assembly comprises a connector and a pressure regulating valve, the connector is provided with an overflowing channel, the output end of the first water pump is communicated with the water inlet end of the heating cavity through the overflowing channel, the pressure regulating valve is provided with a pressure relief water path, the water inlet end of the pressure relief water path is communicated with the overflowing channel, and the water outlet end of the pressure relief water path is communicated with the water tank. According to the coffee machine, the pressure adjusting assembly is arranged on the connecting water path of the first water pump and the heating device so as to adjust the water outlet pressure of the heating device in real time, meanwhile, two water supply modes of the water tank and the external water source are arranged so that a user can conduct switching conveniently, and water subjected to pressure relief of the pressure adjusting assembly can flow back to the water tank to be recycled.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to a coffee machine. Background Technology

[0002] A coffee machine is a household appliance that automatically brews coffee. During the brewing process, controlling the liquid pressure is crucial to the taste and quality of the coffee. However, in existing coffee machines, the extraction water pressure is fixed, making it difficult to customize the extraction pressure according to the flavor of different coffee beans. This results in inconsistent taste and quality, failing to meet the diverse taste preferences of different users. Utility Model Content

[0003] Therefore, it is necessary to provide a coffee machine that addresses the problem of coffee machines being unable to customize the extraction pressure according to the flavor of different coffee beans, thus affecting the taste of the coffee.

[0004] A coffee machine includes: a preparation unit comprising a heating device and a brewing head, the heating device having a heating chamber, the water outlet of the heating chamber being connected to the brewing head; a water supply unit comprising an external water source, a water tank, and a first water pump, the input end of the first water pump being selectively connected to the water tank or the external water source via a pipeline, the first water pump being used to supply water to the heating chamber; and a pressure regulating assembly comprising a connector and a pressure regulating valve, the connector having a flow passage, the output end of the first water pump being connected to the water inlet of the heating chamber via the flow passage, the pressure regulating valve having a pressure relief water path, the inlet end of the pressure relief water path being connected to the flow passage, and the outlet end of the pressure relief water path being connected to the water tank.

[0005] This application provides a coffee machine in which a pressure regulating component is installed on the water circuit connecting the first water pump and the heating device to achieve real-time adjustment of the water pressure output from the heating device, enabling the coffee machine to better adapt to the extraction and preparation requirements of different beverages. It also features two water supply modes: a water tank and an external water source. Users can easily switch between these modes depending on the situation. Using an external water source allows for automatic water refilling and, during cleaning and maintenance, the external water pressure can be used to rinse and clean the internal water circuit. The water tank allows users to store water, better meeting the needs of emergency scenarios such as water outages or outdoor activities. Furthermore, the water released by the pressure regulating component can be recycled back into the water tank, reducing water waste and increasing the coffee machine's output.

[0006] In one embodiment, the pressure regulating valve includes a valve seat, a valve plug, an elastic element, and an adjusting element. The valve seat has an inlet, a pressure relief chamber, and a pressure relief outlet. The inlet, the pressure relief chamber, and the pressure relief outlet are sequentially connected to form the pressure relief water path. The inlet is connected to the flow channel, and the pressure relief outlet is connected to the water tank. The valve plug is movably disposed in the pressure relief chamber and is configured to extend and retract relative to the inlet to open or close the inlet. The adjusting element is movably disposed on the valve seat, with one end extending into the pressure relief chamber and connected to the side of the valve plug away from the inlet via the elastic element. The adjusting element can extend and retract relative to the inlet to adjust the deformation state of the elastic element. By adopting the above structure, when the inlet pressure of the flow channel is too high, the liquid in the flow channel can smoothly enter the pressure relief chamber and be discharged through the pressure relief outlet by pushing the valve plug at the inlet of the valve seat, thereby reducing pressure. Furthermore, the end of the valve plug furthest from the inlet is connected to the adjusting element via an elastic element. By changing the position of the adjusting element on the valve seat, the compression of the elastic element can be adjusted, thereby adjusting the spring pressure. This changes the resistance that the liquid needs to overcome from the valve plug when passing through the inlet, thus achieving real-time adjustment of the water pressure from the heating device. This allows the coffee machine to better adapt to the extraction and preparation requirements of different beverages.

[0007] In one embodiment, the valve seat has a working port communicating with the pressure relief chamber. The working port is positioned opposite to the liquid inlet. One end of the adjusting member extends into the pressure relief chamber through the working port. The inner peripheral wall of the working port has an internal thread, and the outer peripheral wall of the adjusting member has an external thread. The internal thread and the external thread are adapted to each other, allowing the adjusting member to rotate relative to the working port to adjust its position. By providing adapted external and internal threads on the adjusting member and the inner wall of the working port, respectively, the adjusting member and the valve seat can be tightly connected, reducing the possibility of pressure regulation failure due to loosening or detachment. Moreover, the cooperation of the internal and external threads makes the position movement of the adjusting member more precise and controllable, achieving accurate adjustment of the pressure regulating assembly and improving the pressure regulation accuracy of the assembly.

[0008] In one embodiment, the valve seat includes a seat body and a valve cover, the valve cover being detachably mounted on the seat body. The valve cover and the seat body together form the pressure relief chamber, and the valve cover has the working port. By providing a detachable seat body and valve cover, the installation and disassembly of the valve plug, adjusting element, and elastic element can be greatly facilitated, thereby improving installation efficiency.

[0009] In one embodiment, the outer peripheral wall of the adjusting member forms a limiting portion, and the top wall of the limiting portion is disposed opposite to the side wall of the valve cover facing the liquid inlet. By adopting the above structure, when the adjusting member rotates upward away from the liquid inlet, the limiting portion can form a limiting engagement with the valve cover, avoiding excessive operation of the adjusting member that could cause loosening or lead to leakage.

[0010] In one embodiment, the base body has a mounting cavity, the bottom of which has a liquid inlet. An annular step is formed on the inner wall of the mounting cavity away from the liquid inlet, and this annular step is positioned opposite to the side of the adjusting member facing the liquid inlet. By employing this structure, when the adjusting member rotates downwards towards the liquid inlet, it can form a limiting engagement with the annular step, preventing excessive operation of the adjusting member and potential loosening.

[0011] In one embodiment, the pressure regulating valve further includes a sealing ring. The sidewall of the adjusting element or the pressure relief chamber has an annular groove, and the sealing ring is fitted into the annular groove to seal the gap between the adjusting element and the inner sidewall of the pressure relief chamber. By providing the sealing ring, liquid leakage from the connection gap between the adjusting element and the pressure relief chamber is effectively prevented when the adjusting element moves, thereby ensuring the sealing performance and stability of the pressure regulating valve.

[0012] In one embodiment, the adjusting member and / or the valve plug are provided with a limiting groove, and the elastic member is adapted to be disposed in the limiting groove. The limiting groove provides a limiting effect for the installation of the elastic member, thereby reducing the possibility of loosening, displacement or breakage caused by compression of the elastic member.

[0013] In one embodiment, the adjusting member and / or the valve plug are formed with a positioning post, and the elastic member is sleeved on the outside of the positioning post. By adopting the above structure, the elastic member sleeved on the outside of the positioning post can form a limiting effect, thereby reducing the possibility of loosening, displacement or breakage caused by compression of the elastic member, thus improving the accuracy of the pressure regulation process and ensuring the stability and reliability of the pressure regulating assembly.

[0014] In one embodiment, the valve plug has a spherical shape on the side near the inlet. This spherical shape helps reduce resistance to liquid flow, accelerates the response of the elastic element, and allows the pressure regulating assembly to respond more quickly to changes in external pressure, thus improving pressure regulation efficiency.

[0015] In one embodiment, the water supply unit further includes a first three-way control valve. One inlet of the first three-way control valve is connected to an external water source, the other inlet is connected to the water tank, and the outlet is connected to the inlet of the first water pump. By setting a three-way control valve to connect the external water source, the water tank, and the first water pump, the pipeline layout can be simplified, and the user can easily operate the three-way control valve to switch the water inlet mode.

[0016] In one embodiment, the preparation unit further includes a steam device, and the water supply unit further includes a second water pump. The inlet of the second water pump is connected to the outlet of the first three-way control valve, and the outlet of the second water pump is connected to the steam device. The second water pump is used to supply water to the steam device. By adopting the above structure, the input of the second water pump can be selectively connected to a water tank or an external water source through a pipeline, and the user can switch the water supply mode to supply water to the steam device according to different situations.

[0017] In one embodiment, a controller is further included, which is electrically connected to the preparation unit, the water supply unit, and the first three-way control valve. By using the controller to switch the operating state of the first three-way control valve, the water supply source can be easily switched without manual operation, realizing two states: supplying water for coffee preparation or supplying water for cleaning the drain pipe, thus achieving real-time and efficient cleaning of the drain pipe.

[0018] In one embodiment, the system further includes a water tray and a second three-way control valve. The inlet of the second three-way control valve is connected to the outlet of the pressure relief water circuit, one outlet of the second three-way control valve is connected to the water tank, and the other outlet of the second three-way control valve is connected to the water tray. By setting a second three-way control valve at the outlet of the pressure relief water circuit to control the flow direction of the water released by the pressure regulating component, when the water tank is disassembled for cleaning, the coffee machine will use an external water source, and the water released by the pressure regulating component can flow to the water tray and be discharged to the outside. When the water tank is in normal use, the second three-way control valve can be controlled to guide the released water back into the water tank for recycling.

[0019] In one embodiment, the outlet of the pressure relief water path is connected to the water tank via a heat-conducting pipe, which is spirally coiled around the outer surface of the heating chamber. By employing this structure, as the water released by the pressure regulating component flows to the water tank through the heat-conducting pipe, it can simultaneously absorb heat from the outer surface of the heating chamber. This preheats the water stored in the tank to a certain extent, ensuring that the heat generated by the heating device is fully utilized.

[0020] In one embodiment, the controller is electrically connected to the second three-way control valve.

[0021] In one embodiment, a pressure gauge is also included, which is disposed at the water outlet of the heating chamber. The pressure gauge is used to detect the pressure value of the water flowing into the brewing head. The real-time pressure feedback from the pressure gauge allows the user to easily operate the adjustment mechanism, thereby achieving precise pressure adjustment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a coffee machine according to one embodiment;

[0023] Figure 2 This is a cross-sectional view of a pressure regulating valve according to one embodiment.

[0024] The correspondence between the reference numerals and the component names is as follows:

[0025] 1. Heating device;

[0026] 2. Brewing head;

[0027] 3. External water sources;

[0028] 4 water tanks;

[0029] 5. First water pump;

[0030] 6 connectors;

[0031] 7 Pressure regulating valve, 701 Pressure relief water passage, 7011 Liquid inlet, 7012 Pressure relief chamber, 7013 Pressure relief port, 702 Mounting chamber, 703 Limiting groove, 71 Valve seat, 711 Seat body, 712 Valve cover, 72 Valve plug, 73 Elastic element, 74 Adjusting element, 75 Sealing ring.

[0032] 8. First three-way control valve;

[0033] 9. Steam apparatus;

[0034] 10. Second water pump;

[0035] 11 controllers;

[0036] 12 water trays;

[0037] 13. Second and third-way control valve;

[0038] 14. Pressure gauge. Detailed Implementation

[0039] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0040] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0041] The coffee machine of some embodiments of the present invention is described below with reference to the accompanying drawings.

[0042] like Figure 1 and Figure 2 As shown, this embodiment discloses a coffee machine, including: a preparation unit, which includes a heating device 1 and a brewing head 2, the heating device 1 having a heating chamber, the water outlet of the heating chamber being connected to the brewing head 2; a water supply unit, which includes an external water source 3, a water tank 4, and a first water pump 5, the input end of the first water pump 5 being selectively connected to the water tank 4 or the external water source 3 via a pipeline, the first water pump 5 being used to supply water to the heating chamber; and a pressure regulating assembly, which includes a connector 6 and a pressure regulating valve 7, the connector 6 having a flow passage, the output end of the first water pump 5 being connected to the water inlet of the heating chamber via the flow passage, the pressure regulating valve 7 having a pressure relief water passage 701, the water inlet of the pressure relief water passage 701 being connected to the flow passage, and the water outlet of the pressure relief water passage 701 being connected to the water tank 4.

[0043] This application provides a coffee machine in which a pressure regulating component is provided on the water circuit connecting the first water pump 5 and the heating device 1 to achieve real-time adjustment of the water pressure output from the heating device 1, enabling the coffee machine to better adapt to the extraction and preparation requirements of different beverages. It also features two water supply modes: a water tank 4 and an external water source 3, allowing users to switch flexibly according to different situations. Using the external water source 3 facilitates automatic water filling and allows for direct rinsing and cleaning of the internal water circuits during cleaning and maintenance. The water tank 4 allows users to store water, better meeting the needs of emergency scenarios such as water outages and outdoor activities. Furthermore, the water released by the pressure regulating component can flow back into the water tank 4 for recycling, thereby reducing water waste and increasing the coffee machine's output.

[0044] like Figure 2As shown, in addition to the features of the above embodiments, this embodiment further defines: the pressure regulating valve 7 includes a valve seat 71, a valve plug 72, an elastic element 73, and an adjusting element 74. The valve seat 71 is provided with an inlet 7011, a pressure relief chamber 7012, and a pressure relief port 7013. The inlet 7011, the pressure relief chamber 7012, and the pressure relief port 7013 are sequentially connected to form a pressure relief water passage 701. The inlet 7011 is connected to the flow channel, and the pressure relief port 7013 is connected to the water tank 4. The valve plug... Valve plug 72 is movably disposed in pressure relief chamber 7012. Valve plug 72 is configured to extend and retract relative to inlet port 7011 to open or close inlet port 7011. Adjusting member 74 is movably disposed on valve seat 71. One end of adjusting member 74 extends into pressure relief chamber 7012 and is connected to the side of valve plug 72 away from inlet port 7011 via elastic member 73. Adjusting member 74 can extend and retract relative to inlet port 7011 to adjust the deformation state of elastic member 73. With the above structure, when the inlet water pressure of the flow channel is too high, the liquid in the flow channel can smoothly enter pressure relief chamber 7012 and be discharged through pressure relief port 7013 by pushing valve plug 72 at inlet port 7011 of valve seat 71, thereby reducing pressure. Furthermore, the end of the valve plug 72 away from the liquid inlet 7011 is connected to the adjusting member 74 via the elastic member 73. Thus, by changing the position of the adjusting member 74 on the valve seat 71, the compression of the elastic member 73 can be adjusted, thereby adjusting the spring pressure. This changes the resistance that the liquid needs to overcome from the valve plug 72 when passing through the liquid inlet 7011, thereby achieving the effect of real-time adjustment of the water pressure of the heating device 1, enabling the coffee machine to better adapt to the extraction and preparation requirements of different beverages.

[0045] like Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the valve seat 71 is provided with a working port communicating with the pressure relief chamber 7012, the working port is arranged opposite to the liquid inlet 7011, one end of the adjusting member 74 extends into the pressure relief chamber 7012 through the working port, the inner peripheral wall of the working port is provided with an internal thread, and the outer peripheral wall of the adjusting member 74 is provided with an external thread, the internal thread and the external thread are adapted to each other so that the adjusting member 74 can rotate relative to the working port to adjust the position of the adjusting member 74. By providing adapted external and internal threads on the adjusting member 74 and the inner wall of the working port respectively, the adjusting member 74 and the valve seat 71 can be tightly connected, reducing the possibility of pressure regulation failure due to loosening or falling off. Moreover, through the cooperation of the internal and external threads, the position movement of the adjusting member 74 is more precise and controllable, realizing the precise adjustment of the pressure regulating component and improving the pressure regulation accuracy of the pressure regulating component.

[0046] like Figure 2As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the valve seat 71 includes a seat body 711 and a valve cover 712, the valve cover 712 is detachably mounted on the seat body 711, and the valve cover 712 and the seat body 711 enclose a pressure relief chamber 7012, the valve cover 712 is provided with a working port. By providing a detachable seat body 711 and valve cover 712, the installation and disassembly of the valve plug 72, adjusting member 74 and elastic member 73 can be greatly facilitated, thereby improving installation efficiency.

[0047] like Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the outer peripheral wall of the adjusting member 74 forms a limiting portion, and the top wall of the limiting portion is disposed opposite to the side wall of the valve cover 712 facing the liquid inlet 7011. By adopting the above structure, when the adjusting member 74 rotates upward away from the liquid inlet 7011, the limiting portion can form a limiting engagement with the valve cover 712, avoiding excessive operation of the adjusting member 74 that could cause loosening or lead to leakage.

[0048] like Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the base body 711 is provided with a mounting cavity 702, the bottom of the mounting cavity 702 is provided with a liquid inlet 7011, and an annular step is formed on the side of the inner peripheral wall of the mounting cavity 702 away from the liquid inlet 7011. The annular step is disposed opposite to the side of the adjusting member 74 facing the liquid inlet 7011. By adopting the above structure, when the adjusting member 74 rotates downward and approaches the liquid inlet 7011, the adjusting member 74 can form a limiting fit with the annular step, avoiding excessive operation of the adjusting member 74 and causing loosening.

[0049] like Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the pressure regulating valve 7 also includes a sealing ring 75, and the side wall of the adjusting member 74 or the pressure relief chamber 7012 is provided with an annular groove. The sealing ring 75 is adapted to the annular groove and is used to seal the gap between the adjusting member 74 and the inner side wall of the pressure relief chamber 7012. By providing the sealing ring 75, when the adjusting member 74 moves, leakage of liquid from the connection gap between the adjusting member 74 and the pressure relief chamber 7012 is effectively prevented, thereby ensuring the sealing performance and stability of the pressure regulating valve 7.

[0050] like Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the adjusting member 74 and / or the valve plug 72 are provided with a limiting groove 703, and the elastic member 73 is adapted to be disposed in the limiting groove 703. The limiting groove 703 provides a limiting effect for the installation of the elastic member 73, thereby reducing the possibility of loosening, displacement or breakage caused by compression of the elastic member 73.

[0051] like Figure 2As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the adjusting member 74 and / or the valve plug 72 are formed with a positioning post, and the elastic member 73 is sleeved on the outside of the positioning post. By adopting the above structure, the elastic member 73 sleeved on the outside of the positioning post can form a limiting effect, thereby reducing the possibility of loosening, displacement or breakage caused by compression of the elastic member 73, thereby improving the accuracy of the pressure regulating process and ensuring the stability and reliability of the pressure regulating assembly.

[0052] like Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that the valve plug 72 has a spherical shape on the side near the liquid inlet 7011. This spherical shape helps reduce the resistance to liquid flow, accelerates the response speed of the elastic element 73, and enables the pressure regulating assembly to respond more quickly to changes in external pressure, thus improving pressure regulating efficiency.

[0053] like Figure 1 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the water supply unit also includes a first three-way control valve 8, one inlet of the first three-way control valve 8 is connected to an external water source 3, the other inlet of the first three-way control valve 8 is connected to a water tank 4, and the outlet of the first three-way control valve 8 is connected to the inlet of the first water pump 5. By setting a three-way control valve to connect the external water source 3, the water tank 4, and the first water pump 5, it is beneficial to simplify the pipeline layout and facilitate the user to operate the three-way control valve to switch the water inlet mode.

[0054] like Figure 1 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the preparation unit also includes a steam device 9, and the water supply unit also includes a second water pump 10. The inlet of the second water pump 10 is connected to the outlet of the first three-way control valve 8, and the outlet of the second water pump 10 is connected to the steam device 9. The second water pump 10 is used to supply water to the steam device 9. By adopting the above structure, the input end of the second water pump 10 can be selectively connected to the water tank 4 or the external water source 3 through a pipeline, and the user can switch the water supply mode to supply water to the steam device 9 according to different situations.

[0055] like Figure 1 As shown, in addition to the features of the above embodiments, this embodiment further includes a controller 11, which is electrically connected to the preparation unit, the water supply unit, and the first three-way control valve 8. By using the controller 11 to switch the working state of the first three-way control valve 8, the water supply source can be easily switched without manual operation, realizing two states: supplying water for coffee preparation or supplying water for cleaning the drain pipe, thus achieving real-time and efficient cleaning of the drain pipe.

[0056] like Figure 1As shown, in addition to the features of the above embodiments, this embodiment further includes: a water receiving tray 12 and a second three-way control valve 13. The inlet of the second three-way control valve 13 is connected to the outlet of the pressure relief water circuit 701, one outlet of the second three-way control valve 13 is connected to the water tank 4, and the other outlet of the second three-way control valve 13 is connected to the water receiving tray 12. By setting the second three-way control valve 13 on the outlet of the pressure relief water circuit 701 to control the flow direction of the water released by the pressure regulating component, when the water tank 4 is disassembled for cleaning, the coffee machine will use an external water source 3 for water supply, and the water released by the pressure regulating component can flow to the water receiving tray 12 and be discharged to the outside. When the water tank 4 is in normal use, the second three-way control valve 13 can be controlled to guide the water released by the pressure relief to the water tank 4 for recycling.

[0057] In addition to the features of the above embodiments, this embodiment further specifies that: the outlet end of the pressure relief water path 701 is connected to the water tank 4 through a heat-conducting pipe, and the heat-conducting pipe is spirally wound on the outer surface of the heating chamber. By adopting the above structure, as the water released by the pressure regulating component flows to the water tank 4 through the heat-conducting pipe, it can simultaneously absorb heat from the outer surface of the heating chamber through the heat-conducting pipe, thereby preheating the water stored in the water tank 4 to a certain extent, so that the heat generated by the heating device 1 can be fully utilized.

[0058] like Figure 1 As shown, in addition to the features of the above embodiments, this embodiment further specifies that the controller 11 is electrically connected to the second three-way control valve 13.

[0059] like Figure 1 As shown, in addition to the features of the above embodiments, this embodiment further includes a pressure gauge 14, which is installed at the water outlet of the heating chamber. The pressure gauge 14 is used to detect the pressure value of the water flowing into the brewing head 2. The pressure value fed back in real time by the pressure gauge 14 allows the user to easily operate the adjustment component 74, thereby achieving precise adjustment of the pressure value.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A coffee maker, characterized in that, include: The preparation unit includes a heating device (1) and a brewing head (2). The heating device (1) is provided with a heating chamber, and the water outlet of the heating chamber is connected to the brewing head (2). The water supply unit includes an external water source (3), a water tank (4) and a first water pump (5). The input end of the first water pump (5) can be selectively connected to the water tank (4) or the external water source (3) through a pipeline. The first water pump (5) is used to supply water to the heating chamber. The pressure regulating component includes a connector (6) and a pressure regulating valve (7). The connector (6) is provided with a flow channel. The output end of the first water pump (5) is connected to the water inlet of the heating chamber through the flow channel. The pressure regulating valve (7) is provided with a pressure relief water passage (701). The water inlet of the pressure relief water passage (701) is connected to the flow channel, and the water outlet of the pressure relief water passage (701) is connected to the water tank (4).

2. Coffee maker according to claim 1, characterized in that The pressure regulating valve (7) includes a valve seat (71), a valve plug (72), an elastic element (73), and an adjusting element (74). The valve seat (71) is provided with an inlet (7011), a pressure relief chamber (7012), and a pressure relief port (7013). The inlet (7011), the pressure relief chamber (7012), and the pressure relief port (7013) are sequentially connected to form the pressure relief water path (701). The inlet (7011) is connected to the flow channel, and the pressure relief port (7013) is connected to the water tank (4). The valve plug (72) is movably disposed in the pressure relief chamber (7011). In 7012), the valve plug (72) is configured to extend and retract relative to the inlet (7011) to open or close the inlet (7011). The adjusting member (74) is movably disposed on the valve seat (71). One end of the adjusting member (74) extends into the pressure relief chamber (7012) and is connected to the side of the valve plug (72) away from the inlet (7011) via the elastic member (73). The adjusting member (74) can extend and retract relative to the inlet (7011) to adjust the deformation state of the elastic member (73).

3. The coffee maker of claim 2, wherein, The valve seat (71) is provided with a working port that communicates with the pressure relief chamber (7012). The working port is arranged opposite to the liquid inlet (7011). One end of the adjusting member (74) extends into the pressure relief chamber (7012) through the working port. The inner peripheral wall of the working port is provided with an internal thread, and the outer peripheral wall of the adjusting member (74) is provided with an external thread. The internal thread and the external thread are adapted to each other so that the adjusting member (74) can rotate relative to the working port to adjust the position of the adjusting member (74).

4. Coffee maker according to claim 3, characterized in that The valve seat (71) includes a seat body (711) and a valve cover (712). The valve cover (712) is detachably mounted on the seat body (711). The valve cover (712) and the seat body (711) enclose the pressure relief chamber (7012). The valve cover (712) is provided with the working port.

5. The coffee machine according to claim 4, characterized in that, The outer peripheral wall of the adjusting member (74) forms a limiting portion, the top wall of which is disposed opposite to the side wall of the valve cover (712) facing the inlet (7011); and / or The seat body (711) is provided with an installation cavity (702), and the bottom of the installation cavity (702) is provided with the liquid inlet (7011). The inner peripheral wall of the installation cavity (702) away from the liquid inlet (7011) forms an annular step, and the annular step is arranged opposite to the side of the adjusting member (74) facing the liquid inlet (7011).

6. The coffee machine according to claim 2, characterized in that, The pressure regulating valve (7) further includes a sealing ring (75). The side wall of the adjusting member (74) or the pressure relief chamber (7012) is provided with an annular groove. The sealing ring (75) is adapted to the annular groove and is used to seal the gap between the adjusting member (74) and the inner side wall of the pressure relief chamber (7012); and / or The adjusting member (74) and / or the valve plug (72) are provided with a limiting groove (703), and the elastic member (73) is adapted to be disposed in the limiting groove (703); and / or The adjusting member (74) and / or the valve plug (72) are formed with a positioning post, and the elastic member (73) is sleeved on the outside of the positioning post; and / or The valve plug (72) is spherical on the side near the liquid inlet (7011).

7. The coffee maker of claim 1, wherein, The water supply unit also includes a first three-way control valve (8), one inlet of the first three-way control valve (8) is connected to an external water source (3), the other inlet of the first three-way control valve (8) is connected to the water tank (4), and the outlet of the first three-way control valve (8) is connected to the inlet of the first water pump (5).

8. The coffee machine according to claim 7, characterized in that, The preparation unit further includes a steam device (9), and the water supply unit further includes a second water pump (10). The inlet of the second water pump (10) is connected to the outlet of the first three-way control valve (8), and the outlet of the second water pump (10) is connected to the steam device (9). The second water pump (10) is used to supply water to the steam device (9); and / or It also includes a controller (11), which is electrically connected to the preparation unit, the water supply unit and the first three-way control valve (8).

9. The coffee machine according to claim 1, characterized in that, It also includes a water receiving tray (12) and a second three-way control valve (13), the inlet of which is connected to the outlet of the pressure relief water circuit (701), one outlet of which is connected to the water tank (4), and the other outlet of which is connected to the water receiving tray (12); and / or The outlet of the pressure relief water passage (701) is connected to the water tank (4) through a heat-conducting pipe, and the heat-conducting pipe is spirally coiled around the outer surface of the heating chamber.

10. The coffee maker of claim 1, wherein, Also included is a pressure gauge (14) arranged on the water outlet end of the heating chamber, for detecting the pressure value of the water flow entering the brewing head (2).

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