Waterway control system of coffee machine, coffee machine and control method

Abstract

The invention provides a waterway control system of a coffee machine, the coffee machine and a control method. The system comprises a water tank, a water pump, a boiler, a milk foaming unit, a coffee brewing unit and a control unit which are sequentially connected, and the control unit is electrically connected with the water pump so as to control voltage input into the water pump; a water outlet of the boiler is selectively communicated with the milk foaming unit or the coffee brewing unit; a mechanical pressure valve is arranged between the boiler and the coffee brewing unit, and when the water temperature in the boiler is higher than a second preset value and the coffee brewing unit is used, the control unit outputs preset voltage lower than the rated voltage of the water pump to the water pump so as to extract water flow at normal temperature and lower than normal water volume from the water tank to cool the boiler; and if the water pressure of the cooled mixed water does not reach the preset threshold value of breakover of the coffee brewing unit, the mixed water is discharged through the mechanical pressure valve, and boiler cooling is accelerated. According to the waterway control system, different brewing units can be rapidly switched, the water temperature of the boiler does not need to be naturally reduced, and the user experience is improved.

Description

Technical Field

[0001] The disclosed embodiments relate to the technical field of coffee machines, and in particular to a water circuit control system of a coffee machine, a coffee machine, and a control method thereof. Background Art

[0002] In the existing single-boiler fancy coffee machines, the water control system generally requires two three-way solenoid valves, one three-way solenoid valve A distributes the direction of hot water or steam, and the other three-way solenoid valve B is used to cool the boiler to solve the problem of excessively high temperature when making coffee after making milk.

[0003] For example, Chinese patent publication number CN105054795B discloses a water circuit structure of a beverage machine, including a water tank, a water pump, a boiler and a brewing mechanism. The water outlet of the boiler is also connected to a first hot water discharge pipe, and the first hot water discharge pipe is provided with a first valve that can control the flow or disconnection of water flow; the water outlet of the boiler is also connected to a second hot water discharge pipe, and the second hot water discharge pipe is provided with a second valve that can control the flow or disconnection of water flow. The water outlet of the second hot water discharge pipe is provided with a nozzle that can speed up the flow of water, and the nozzle is used to discharge high-speed hot water that can make milk foam. This patent realizes two-way water supply of a boiler, one for hot water and one for coffee, which can only be achieved by using two solenoid valves. In this patent, the coffee machine has the function of a water dispenser, but it cannot switch between brewing milk and drinking coffee at will. It needs to lower the water temperature in the boiler before it can become a water dispenser. The setting of two solenoid valves increases the structure and increases the cost. Summary of the invention

[0004] The purpose of the embodiments of the present disclosure is to provide a water circuit control system of a coffee machine, a coffee machine and a control method, so as to solve the above-mentioned problems existing in the prior art.

[0005] In order to achieve the above objectives, the technical solutions adopted by the embodiments of the present disclosure are as follows:

[0006] On the one hand, an embodiment of the present disclosure provides a water circuit control system for a coffee machine, the water circuit control system comprising: a water tank, a water pump and a boiler connected in sequence, the water circuit control system further comprising:

[0007] milk frothing unit;

[0008] Coffee brewing unit;

[0009] a control unit, the control unit being electrically connected to the water pump to control a voltage input to the water pump;

[0010] The water outlet of the boiler is selectively connected to the milk frothing unit or the coffee brewing unit; a mechanical pressure valve is arranged between the boiler and the coffee brewing unit. When the water temperature in the boiler is higher than a second preset value and the coffee brewing unit is used, the control unit outputs a preset voltage lower than the rated voltage of the water pump to the water pump, so as to draw water with normal temperature and lower than the normal water volume from the water tank to cool the boiler. The water pressure of the mixed water after cooling does not reach the preset threshold value for the conduction of the coffee brewing unit, and the mixed water is discharged by the mechanical pressure valve to accelerate the cooling of the boiler.

[0011] Exemplarily, the waterway control system further includes:

[0012] A three-way solenoid valve, wherein the inlet of the three-way solenoid valve is connected to the water outlet of the boiler, the first outlet of the three-way solenoid valve is connected to the water inlet of the milk frothing unit, and the second outlet of the three-way solenoid valve is connected to the water inlet of the coffee brewing unit through the mechanical pressure valve.

[0013] Exemplarily, the mechanical pressure valve comprises: an upper cover, provided with a water inlet, a side wall at the end of the water inlet is provided with a discharge port, and the water inlet is connected to the second outlet of the three-way solenoid valve;

[0014] The valve core is provided with a water hole;

[0015] A lower cover, wherein the lower cover is sealed and connected with the upper cover to form a pressure relief chamber, and the pressure relief chamber is provided with the valve core;

[0016] A water outlet channel is arranged at the bottom of the pressure relief chamber away from the pressure relief chamber, and the water outlet channel is connected to the water inlet of the coffee brewing unit; a brewing hole and a drainage hole are respectively arranged on the bottom wall of the pressure relief chamber, and the brewing hole is connected to the water outlet channel.

[0017] Exemplarily, a reinforcement ring protruding toward the upper cover is provided in the central area of ​​the valve core, and a groove is formed in the reinforcement ring;

[0018] The water inlet is arranged in the central area of ​​the upper cover, and a positioning tube matching with the groove is arranged circumferentially toward the lower cover of the water inlet, and the side wall of the end of the positioning tube is provided with the discharge port.

[0019] Exemplarily, a cone head is provided in the central area of ​​one side of the valve core facing the lower cover, the drain hole is provided in the central area of ​​the lower cover, and is provided with a cone hole surface matching with the cone head; the cone head and the cone hole surface are provided with a reset elastic member.

[0020] Exemplarily, when the boiler is connected to the coffee brewing unit, the control unit outputs a preset voltage lower than the rated voltage to the water pump, and the water pump draws a water flow lower than the normal water volume from the water tank and delivers it to the boiler to cool the mixed water of the boiler. Since the water flow pressure does not reach the preset threshold, the valve core fits with the upper cover, the drainage hole opens, and the water flows into the pressure relief chamber from the drainage port of the upper cover of the mechanical pressure valve. Since the water flow pressure does not reach the preset threshold, the water inlet end of the coffee brewing unit is not connected, so the water flows out from the water hole and the drainage hole.

[0021] The control unit outputs rated voltage to the water pump, and the water pump draws a normal amount of water from the water tank and delivers it to the boiler, which heats the water and outputs it. As the water pressure reaches or exceeds a preset threshold, the valve core moves toward the lower cover, compressing the reset elastic member so that the cone head and the cone hole are sealed and fitted, and the drain hole is closed. Water flows into the pressure relief chamber from the water inlet of the upper cover. As the water pressure reaches or exceeds the preset threshold for the conduction of the coffee brewing unit, water flows from the water through hole and the brewing hole into the water outlet channel and into the coffee brewing unit.

[0022] Exemplarily, when the milk frothing unit or the coffee brewing unit is used, the control unit outputs the rated voltage of the water pump to the water pump, the water pump pumps water from the water tank to the boiler, the boiler heats the water temperature to the first preset value or the second preset value, and outputs the water to the milk frothing unit or the coffee brewing unit;

[0023] When the coffee brewing unit is directly switched from the milk frothing unit, the boiler temperature is higher than the second preset value, the control unit outputs a preset voltage lower than the rated voltage of the water pump to the water pump, and the water pump pumps water from the water tank to the boiler to cool the high-temperature water in the boiler. Since the water pressure of the cooled mixed water does not reach the preset threshold of the water flow pressure required by the coffee brewing unit, the water is discharged through the mechanical pressure valve until the boiler is cooled to the second preset value;

[0024] The preset voltage is 40% to 70% of the rated voltage.

[0025] Another aspect of the disclosed embodiment provides a coffee machine, comprising the water circuit control system as described above.

[0026] Another aspect of the disclosed embodiment provides a water circuit control method for a coffee machine, using the water circuit control system as described above, the method comprising:

[0027] When the milk frothing unit is used, the control unit outputs the rated voltage of the water pump to the water pump, and the water pump draws water from the water tank at the rated voltage and inputs it into the boiler, and the boiler heats the water in the water tank to a first preset value, generates steam, and outputs it to the milk frothing unit to achieve brewing;

[0028] The boiler temperature does not exceed the temperature of the coffee brewing unit. When the coffee brewing unit is used, the control unit outputs the rated voltage of the water pump to the water pump. The water pump draws water from the water tank at the rated voltage and inputs it into the boiler. The boiler heats the water in the water tank to a second preset value to generate hot water. The water volume is the normal water volume of the water pump. The water pressure reaches the preset threshold value for the conduction of the coffee brewing unit. The hot water passes through the mechanical pressure valve and enters the coffee brewing unit to achieve brewing.

[0029] If the milk frothing unit is switched directly to the coffee brewing unit, the water temperature in the boiler exceeds the second preset value, the control unit outputs a preset voltage lower than the rated voltage of the water pump to the water pump, the water pump pumps water from the water tank at the preset voltage and inputs it into the boiler for cooling, the cooled mixed water is output to the mechanical pressure valve, since the water volume is lower than the normal water volume pumped by the rated voltage of the water pump, the water flow pressure does not reach the preset threshold value for conduction of the coffee brewing unit, the mixed water is directly discharged by the mechanical pressure valve until the boiler is cooled to the second preset value and the coffee brewing unit is used again.

[0030] Exemplarily, the preset voltage is 40% to 70% of the rated voltage; when the mechanical pressure valve includes a cone head, the mixed water is directly discharged from the mechanical pressure valve, including: the mixed water flow below the normal water volume enters the pressure relief chamber through the discharge port, the water pressure does not reach the preset threshold of the water pressure for conduction of the coffee brewing unit, the valve core fits with the upper cover, the drain hole is opened, and the water flows from the water hole and the drain hole to the waste water box.

[0031] The beneficial effects of the embodiments of the present disclosure are:

[0032] The water control system of the disclosed embodiment can switch between the milk frothing unit and the coffee brewing unit at will. When the high-temperature milk frothing unit switches to the lower-temperature coffee brewing unit, the control unit lowers the voltage output to the water pump, thereby reducing the amount of water pumped from the water tank to the boiler. This can discharge the cooled mixed water through the mechanical pressure valve and speed up the cooling of the boiler, thereby quickly switching the brewing units and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of a water circuit control system of a coffee machine provided by an embodiment of the present disclosure;

[0034] Figure 2 It is a flow chart of a water circuit control method for a coffee machine provided in an embodiment of the present disclosure.

[0035] In the figure,

[0036] 10. Water tank; 20. Water pump; 30. Boiler; 40. Three-way solenoid valve; 50. Mechanical pressure valve; 501. Upper cover; 5011. Drain port; 5012. Water inlet; 502. Valve core; 5021. Water hole; 5022. Cone head; 503. Lower cover; 5031. Cone hole; 5032. Drain pipe; 5033. Brewing hole; 5034. Drain hole; 60. Coffee brewing unit; 70. Milk frothing unit; 80. Control unit; 1 to 7 indicate the water flow path, and the arrow indicates the water flow direction; 90. Waste water box. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiment of the present disclosure more clear, the embodiment of the present disclosure is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to explain the embodiment of the present disclosure and are not used to limit the embodiment of the present disclosure.

[0038] like Figure 1 As shown, the embodiment of the present disclosure proposes a water circuit control system for a coffee machine, the water circuit control system includes: a water tank 10, a water pump 20 and a boiler 30 connected in sequence, the water circuit control system also includes: a milk frothing unit 70; a coffee brewing unit 60; a control unit 80, the control unit 80 is electrically connected to the water pump 20 to control the voltage input to the water pump 20; the water outlet of the boiler 30 is selectively connected to the milk frothing unit 70 or the coffee brewing unit 60; a mechanical pressure valve 50 is arranged between the boiler 30 and the coffee brewing unit 60, when the water temperature in the boiler is higher than the second preset value, when the coffee brewing unit is used, the control unit 80 outputs a preset voltage lower than the rated voltage of the water pump to the water pump 20, so as to draw a water flow of normal temperature and lower than the normal water volume from the water tank 10 to cool the boiler 30, the water pressure of the mixed water after cooling does not reach the preset threshold value for the conduction of the coffee brewing unit, and the mixed water is discharged by the mechanical pressure valve 50 to accelerate the cooling of the boiler 30.

[0039] In the disclosed embodiment, the brewing temperature of the milk frothing unit is higher than that of the coffee brewing unit. When brewing corresponding beverages, both need to heat the boiler to reach the corresponding preset temperature. In order to realize the arbitrary switching of brewing beverages, the water circuit control system of the disclosed embodiment is provided with a mechanical pressure valve on one side of the coffee brewing unit. When the coffee brewing unit switches to the milk frothing unit, it can be achieved by controlling the heating of the boiler. However, when the milk frothing unit with a higher brewing temperature switches to the coffee brewing unit with a lower brewing temperature, if the boiler is only cooled naturally, it takes a long time to wait, which is not conducive to user experience.

[0040] Generally, a one-way valve or coffee powder blockage is provided in front of the water outlet of the water inlet water path of the coffee brewing unit, so that the coffee brewing unit will only discharge water when the water pressure of the water inlet reaches or exceeds the preset threshold value, thereby achieving coffee brewing. The water path control system of the disclosed embodiment controls the output voltage of the water pump to a preset voltage lower than the rated voltage through the control unit, so as to adjust the water pump to extract a normal temperature water volume lower than the normal water volume from the water tank to the boiler to cool the boiler. Since the water pressure does not reach the preset threshold value for the conduction of the coffee brewing unit, the cooled mixed water is discharged into the waste water box through the mechanical pressure valve, so as to achieve the purpose of quickly reducing the boiler temperature, realize the rapid switching from a higher brewing temperature to a lower brewing temperature, reduce the waiting time, and improve the user experience.

[0041] like Figure 1 As shown, the water circuit control system also includes: a three-way solenoid valve 40, the inlet of the three-way solenoid valve 40 is connected to the water outlet of the boiler 30, the first outlet of the three-way solenoid valve 40 is connected to the water inlet of the milk frothing unit 70, and the second outlet of the three-way solenoid valve 40 is connected to the water inlet of the coffee brewing unit 60 through the mechanical pressure valve.

[0042] The water circuit control system of the disclosed embodiment realizes the switching of the water circuits between the boiler and the milk frothing unit and the coffee brewing unit by only one three-way solenoid valve.

[0043] like Figure 1 As shown, as a specific example of a mechanical pressure valve, the mechanical pressure valve 50 includes: an upper cover 501, provided with a water inlet 5012, a side wall at the end of the water inlet 5012 is provided with a drain port 5011, and the water inlet 5012 is connected to the second outlet of the three-way solenoid valve 40; a valve core 502, provided with a water hole 5021; a lower cover 503, the lower cover 503 is sealed and connected with the upper cover 51 to form a pressure relief chamber (not marked in the figure), and the pressure relief chamber is provided with the valve core 502; a water outlet channel (not marked in the figure) is provided at the bottom of the pressure relief chamber away from the pressure relief chamber, and the water outlet channel is connected to the water inlet of the coffee brewing unit 60; the bottom wall of the pressure relief chamber is respectively provided with a brewing hole 5033 and a drain hole 5034, and the brewing hole 5033 is connected to the water outlet channel.

[0044] Specifically, the central area of ​​the upper cover is provided with an opening, which is a water inlet. The upper cover is provided with a water inlet pipe, which is connected to the water inlet, and a discharge port is provided on the side wall at the end of the water inlet. The drainage hole is provided in the central area of ​​the lower cover, the brewing hole is provided at the edge of the lower cover, and the water outlet channel can also be close to the edge of the lower cover. A drainage pipe 5032 is connected below the discharge port. The waterway control system also includes: a waste water box 90, which is provided below the discharge port and is used to collect mixed water output by the boiler. Specifically, the waste water box can be provided below the drainage pipe.

[0045] When the boiler of the disclosed embodiment is connected to the coffee brewing unit, the boiler temperature is lower than or equal to the second preset value, and the coffee brewing unit is used. The control unit controls the rated voltage of the output water pump, and the water pump draws a normal amount of water from the water tank at the rated voltage. After being heated by the boiler, the normal amount of water flows through the water inlet of the mechanical pressure valve, pressing the valve core downward, and the valve core blocks the drainage hole of the lower cover. Since the water flow pressure reaches or exceeds the preset threshold value of the conduction of the coffee brewing unit, the water flows through the water hole and the brewing hole into the water outlet channel and then enters the coffee brewing unit; the water temperature in the boiler is higher than the second preset value. When the coffee brewing unit is used, the boiler needs to be cooled down first. The control unit controls the output to be a preset voltage lower than the rated voltage of the water pump. The water pump draws out a water volume lower than the normal water volume from the water tank at the preset voltage. After entering the high-temperature boiler to cool the boiler, the water flow pressure is low and does not reach the preset threshold value for the conduction of the coffee brewing unit. It is not enough to press down the valve core or move the valve core downward, but it is not enough to block the drain hole. The drain hole is in an open state. The mixed water enters the pressure relief chamber through the discharge port of the water inlet of the mechanical pressure valve. The water inlet water path of the coffee brewing unit is not conducted, and the water flows out through the water hole and the drain hole. The preset voltage can be set according to actual conditions.

[0046] like Figure 1 As shown, a reinforcement ring (not marked in the figure) protruding toward the upper cover is provided in the central area of ​​the valve core 502, and a groove is formed inside the reinforcement ring; the water inlet 5012 is provided in the central area of ​​the upper cover, and a positioning tube matching the groove is provided circumferentially toward the lower cover 503 of the water inlet 5012, and the side wall at the end of the positioning tube is provided with the discharge port 5011.

[0047] The water hole is arranged on the outside of the reinforcement ring, and the positioning tube extends to the pressure relief chamber by a preset distance, which is equal to the height of the reinforcement ring, so that when the valve core is located in the upper cover, the positioning tube can be accommodated in the groove in the reinforcement ring. The control unit outputs a preset voltage lower than the rated voltage to the water pump, and the water pump draws out a normal temperature water volume lower than the normal water volume from the water tank, and delivers it to the boiler. When it is mixed with the high temperature water of the boiler for cooling and output, the water volume is small, and the water pressure does not reach the preset threshold value of the water inlet conduction of the coffee brewing unit. The water flow pressure is not enough to punch the valve core, and the end face of the upper cover positioning tube fits with the groove surface of the valve core, the valve core is separated from the lower cover, the drainage hole is opened, and the water flows out from the drainage port on the side wall of the positioning tube. Since the water pressure is lower than the preset threshold value of the conduction of the coffee brewing unit, a small water flow flows out from the water hole of the valve core and the drainage hole of the lower cover to achieve drainage. The control unit outputs rated voltage to the water pump, and the water pump draws a normal amount of water from the water tank and transports it to the boiler. When the water is heated and output by the boiler, the amount of water is large, and the water pressure reaches or exceeds the preset threshold value of the water inlet conduction of the coffee brewing unit. The water pressure is higher than or equal to the preset threshold value of the conduction of the coffee brewing unit. Under the action of water flow pressure, the valve core moves toward the lower cover, the valve core separates from the upper cover, the valve core covers the drain hole, and water flows from the water inlet into the pressure relief chamber, and the water flows out from the water hole of the valve core and the brewing hole of the lower cover into the coffee brewing unit.

[0048] like Figure 1 As shown, a cone head 5022 is provided in the central area of ​​one side of the valve core 502 facing the lower cover, the drainage hole 5034 is provided in the central area of ​​the lower cover 503, and is provided with a cone hole 5031 matching with the cone head 5022; the cone head 5022 and the cone hole 5031 are provided with a reset elastic member.

[0049] The radial dimension of the cone head gradually decreases from the end close to the upper cover to the end away from the upper cover, and a plugging head is provided at the end of the cone head away from the upper cover. The drainage hole is circumferentially provided with a cone hole protruding toward the pressure relief chamber, and the end of the cone hole is provided with an inclined surface matching the side surface of the cone head, and the plugging head is inserted into the cone hole. The reset elastic member can be a spring, which is sleeved on the outside of the cone head and the cone hole, and the two ends of the spring abut against the lower cover and the valve core respectively. A clamping platform is provided at the connection between the cone head and the valve core, and the spring abuts against the clamping platform.

[0050] When the water volume is the normal water volume of the water pump, the water pressure reaches or exceeds the preset threshold value of the water inlet water path of the coffee brewing unit, and water pressure is generated when passing through the water inlet 5012, applying pressure to the valve core 502. The valve core can be a soft rubber diaphragm sealing piece, a compressed reset elastic member, and the valve core 502 moves downward under pressure. The conical surface on the valve core 502, that is, the cone head 5022 and the cone hole 5031 are pressed and tightly fitted together to block the drainage hole. The water path 7 is closed, and the water pressure reaches the preset threshold value of the coffee brewing unit. The water flows from the water hole 5033 and the brewing hole 5033 through the water path 6 into the coffee brewing unit 60.

[0051] When the water volume is lower than the normal water volume of the water pump, the water pressure does not reach the preset threshold value of the water inlet conduction of the coffee brewing unit, and the water pressure passing through the water inlet 5012 is not enough to compress the reset elastic part, the groove surface of the valve core and the end surface of the positioning tube are still in contact, the drainage hole is opened, and the water flows out from the discharge port on the side wall of the positioning tube. The water pressure does not reach the preset threshold value of the conduction of the coffee brewing unit, and the water flows through the water hole and the drainage hole to be discharged to the waste water box 90.

[0052] The working principle of the water control system of the disclosed embodiment is as follows: when using a milk frothing unit or a coffee brewing unit, the control unit outputs the rated voltage of the water pump to the water pump, the water pump pumps water from the water tank to the boiler, the boiler heats the water temperature to a first preset value or a second preset value, and outputs the water to the milk frothing unit or the coffee brewing unit.

[0053] When the milk frothing unit directly switches to the coffee brewing unit, the boiler temperature is higher than the second preset value, and the control unit outputs a preset voltage of the rated voltage of the water pump to the water pump, and the water pump pumps water from the water tank to the boiler to cool down the high-temperature water in the boiler. The cooled mixed water, because the water pressure of the mixed water does not reach the preset threshold of the water flow pressure required by the coffee brewing unit, the water flows out through the mechanical pressure valve until the boiler is cooled to the second preset value.

[0054] The preset voltage is 40% to 70% of the rated voltage.

[0055] The boiler heats water to a first preset value to generate steam so that the milk frothing unit can brew milk.

[0056] Another aspect of the disclosed embodiment provides a coffee machine, comprising the water circuit control system as described above.

[0057] like Figure 2 As shown, another aspect of the embodiment of the present disclosure provides a water circuit control method for a coffee machine, using the water circuit control system as described above, the method comprising:

[0058] Step S100, when using the milk frothing unit, the control unit outputs the rated voltage of the water pump to the water pump, the water pump draws water from the water tank at the rated voltage and inputs it into the boiler, the boiler heats the water in the water tank to a first preset value, generates steam, and outputs it to the milk frothing unit to achieve brewing.

[0059] When making milk, the water pump voltage uses the rated voltage, such as the Chinese standard 220V, the water pump 20 starts working, the water flow 1 goes from the water tank 10 to the water pump 20, and then to the boiler 30 to heat and generate steam, the steam goes through the pipeline 30 to the three-way solenoid valve 40, and the solenoid valve distributes the steam from the No. 4 water channel to the milk frothing device 70 to make frothed milk.

[0060] Step S200, the boiler temperature does not exceed the temperature of the coffee brewing unit, that is, the second preset value. When the coffee brewing unit is used, the control unit outputs the rated voltage of the water pump to the water pump. The water pump draws water from the water tank at the rated voltage and inputs it into the boiler. The boiler heats the water in the water tank to the second preset value to generate hot water. The water volume is the normal water volume of the water pump. The water pressure reaches the preset threshold value for the conduction of the coffee brewing unit. The hot water passes through the mechanical pressure valve and enters the coffee brewing unit to achieve brewing.

[0061] At this time, the boiler temperature is not higher than the temperature for making coffee. When making coffee, the water pump voltage applies the rated voltage, the water pump 20 starts working, water flows through the No. 1 water path from the water tank 10 to the water pump 20, and then to the boiler 30 to be heated to the second preset value, and the hot water flows through the pipeline 30 to the three-way solenoid valve 40, and the solenoid valve distributes the hot water from the No. 5 water path to the coffee brewing device 60 to make coffee.

[0062] Step S300, if the water temperature in the boiler is higher than the second preset value when switching directly from the milk frothing unit to the coffee brewing unit, the control unit outputs a preset voltage lower than the rated voltage of the water pump to the water pump, the water pump pumps water from the water tank at the preset voltage of the rated voltage and inputs it into the boiler for cooling, the cooled mixed water is output to the mechanical pressure valve, because the water volume is lower than the normal water volume pumped by the rated voltage of the water pump, the water flow pressure does not reach the preset threshold value of the conduction of the coffee brewing unit, the mixed water is directly discharged by the mechanical pressure valve until the boiler is cooled to the second preset value, and the coffee brewing unit is used again. The preset voltage is 40% to 70% of the rated voltage.

[0063] The mixed water is directly discharged by the mechanical pressure valve including:

[0064] The mixed water flow with a lower water volume than normal enters the pressure relief chamber through the drain port. The water pressure does not reach the preset water pressure threshold for the coffee brewing unit to be turned on. The valve core fits the upper cover, the drain hole opens, and the water flows from the water hole and the drain hole to the waste water box.

[0065] When the milk is made and coffee is prepared, the temperature of the boiler 30 is higher than the temperature for making coffee because the steam has just been made. The boiler 30 needs to be cooled down. At this time, the control unit 80 outputs 40% to 70% of the rated voltage of the water pump, for example, 88 to 154V, and the rated voltage is 220V, to the water pump 20. The water pump 20 draws water at room temperature from the water tank 10 to the boiler 30 for cooling. The high temperature of the boiler converts the room temperature water into a mixture of water vapor and hot water, which is then transferred to the three-way solenoid valve 40 through the water path 30. The three-way solenoid valve 40 distributes the steam and hot water mixture from the No. 5 water path to the mechanical pressure valve 50. The water pressure does not reach the preset threshold value for the conduction of the coffee brewing unit. The water flows from the water inlet, the discharge port 5011, the water hole 5021, the conical hole 5031, the drainage hole 5034 and the drainage pipe 5032 to the waste water box 90.

[0066] When the temperature of the boiler drops to the coffee temperature, that is, the second preset value, the control unit 80 outputs 100% (220V) of the rated voltage of the water pump to the water pump 20, and the water pump 20 starts to work. The water flows from the water tank 10 of the water circuit 1 to the water pump 20, and then to the boiler 30 for heating to produce hot water. The water flows through the water circuit 30 to the three-way solenoid valve 40, and the three-way solenoid valve 40 distributes the hot water from the water circuit 5 to the mechanical pressure valve 50. At this time, the water volume is the normal water volume of the water pump. When passing through the water inlet 5012, water pressure is generated, and pressure is applied to the valve core 502. The valve core 502 moves downward under pressure, and the conical surface on the valve core 502, that is, the cone head 5022 and the cone hole 5031 are pressed and tightly fitted together, the water circuit 7 is closed, and the water pressure reaches the preset threshold value for the conduction of the coffee brewing unit. The water flows from the water hole 5033 through the water circuit 6 to the coffee brewing unit 60, that is, the coffee brewing device.

[0067] The above is only a preferred implementation of the embodiment of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present disclosure. These improvements and modifications should also be considered as the protection scope of the embodiment of the present disclosure.

Claims

1. A water circuit control system for a coffee machine, the water circuit control system comprising: A water tank (10), a water pump (20) and a boiler (30) connected in sequence, characterized in that the water circuit control system further comprises: Milk frothing unit (70); Coffee brewing unit (60); A control unit (80), the control unit (80) being electrically connected to the water pump (20) to control a voltage input to the water pump (20); The water outlet of the boiler (30) is selectively connected to the milk frothing unit (70) or the coffee brewing unit (60); a mechanical pressure valve (50) is provided between the boiler (30) and the coffee brewing unit (60); when the water temperature in the boiler is higher than a second preset value and the coffee brewing unit is used, the control unit (80) outputs a preset voltage lower than the rated voltage of the water pump (20) to the water pump (20), so as to draw a water flow of normal temperature and lower than the normal water volume from the water tank (10) to cool the boiler (30); the water pressure of the mixed water after cooling does not reach the preset threshold value for the conduction of the coffee brewing unit, and the mixed water is discharged by the mechanical pressure valve (50) to accelerate the cooling of the boiler (30).

2. The waterway control system according to claim 1, characterized in that: The waterway control system also includes: A three-way solenoid valve (40), wherein the inlet of the three-way solenoid valve (40) is connected to the water outlet of the boiler (30), the first outlet of the three-way solenoid valve (40) is connected to the water inlet of the milk frothing unit (70), and the second outlet of the three-way solenoid valve (40) is connected to the water inlet of the coffee brewing unit (60) through the mechanical pressure valve.

3. The waterway control system according to claim 2, characterized in that: The mechanical pressure valve comprises: The upper cover (501) is provided with a water inlet (5012), a side wall at the end of the water inlet (5012) is provided with a discharge port (5011), and the water inlet is connected to the second outlet of the three-way solenoid valve (40); The valve core (502) is provided with a water hole (5021); A lower cover (503), the lower cover (503) is sealedly connected to the upper cover (501) to form a pressure relief chamber, and the pressure relief chamber is provided with the valve core (502); A water outlet channel is provided at the bottom of the pressure relief chamber away from the pressure relief chamber, and the water outlet channel is connected to the water inlet of the coffee brewing unit (60); a brewing hole (5033) and a drainage hole (5034) are respectively provided on the bottom wall of the pressure relief chamber, and the brewing hole (5033) is connected to the water outlet channel.

4. The waterway control system according to claim 3, characterized in that: The valve core (502) is provided with a reinforcement ring protruding toward the upper cover in the central area, and a groove is formed in the reinforcement ring; The water inlet (5012) is arranged in the central area of ​​the upper cover, and a positioning tube matching the groove is arranged circumferentially toward the lower cover of the water inlet (5012), and the side wall at the end of the positioning tube is provided with the discharge port (5011).

5. The waterway control system according to claim 3, characterized in that: A cone head (5022) is provided in the central area of ​​one side of the valve core (502) facing the lower cover; The drainage hole (5034) is arranged in the central area of ​​the lower cover (503) and is provided with a conical hole (5031) that matches the conical head (5022); the conical head (5022) and the conical hole (5031) are provided with a reset elastic member.

6. The waterway control system according to claim 5, characterized in that: When the boiler (30) is connected to the coffee brewing unit (60); The control unit (80) outputs a preset voltage lower than the rated voltage to the water pump (20), and the water pump (20) draws water flow lower than the normal water volume from the water tank and delivers it to the boiler (30). The mixed water used to cool the boiler (30) is not heated. Since the water flow pressure does not reach the preset threshold value, the valve core (502) fits with the upper cover (501), and the drainage hole (5034) opens. Water flows from the drainage port (5011) of the upper cover of the mechanical pressure valve (50) into the pressure relief chamber. Since the water flow pressure does not reach the preset threshold value, the water inlet end of the coffee brewing unit is not connected, so the water flows out from the water hole (5021) and the drainage hole (5034); The control unit (80) outputs a rated voltage to the water pump (20), and the water pump (20) draws a normal amount of water from the water tank and delivers it to the boiler (30), where it is heated and output by the boiler (30). As the water flow pressure reaches or exceeds a preset threshold, the valve core (502) moves toward the lower cover, compressing the reset elastic member so that the cone head (5022) and the cone hole (5031) are sealed and fitted, and the drainage hole (5034) is closed. Water flows from the water inlet (5012) of the upper cover into the pressure relief chamber. As the water flow pressure reaches or exceeds a preset threshold for the conduction of the coffee brewing unit, water flows from the water through hole (5021) and the brewing hole (5033) into the water outlet channel and enters the coffee brewing unit (60).

7. The waterway control system according to any one of claims 1 to 6, characterized in that: When the milk frothing unit (70) or the coffee brewing unit (60) is used, the control unit (80) outputs the rated voltage of the water pump (20) to the water pump (20), the water pump (20) pumps water from the water tank (10) to the boiler (30), and the boiler (30) heats the water temperature to a first preset value or a second preset value to output the water to the milk frothing unit (70) or the coffee brewing unit (60); When the coffee brewing unit (60) is directly switched from the milk frothing unit (70), the boiler temperature is higher than a second preset value, the control unit (80) outputs a preset voltage lower than the rated voltage of the water pump (20) to the water pump (20), and the water pump (20) pumps water from the water tank to the boiler (30) to cool the high-temperature water in the boiler (30). Since the water pressure of the cooled mixed water does not reach the preset threshold value of the water flow pressure required by the coffee brewing unit, the water flow is discharged through the mechanical pressure valve (50) until the temperature of the boiler (30) is cooled to the second preset value; The preset voltage is 40% to 70% of the rated voltage.

8. A coffee machine, characterized in that: The coffee machine comprises the water circuit control system according to any one of claims 1 to 7.

9. A water channel control method for a coffee machine, using the water channel control system according to any one of claims 1 to 7, characterized in that: The method comprises: When the milk frothing unit is used, the control unit outputs the rated voltage of the water pump to the water pump, and the water pump draws water from the water tank at the rated voltage and inputs it into the boiler, and the boiler heats the water in the water tank to a first preset value, generates steam, and outputs it to the milk frothing unit to achieve brewing; The boiler temperature does not exceed the temperature of the coffee brewing unit, that is, the second preset value. When the coffee brewing unit is used, the control unit outputs the rated voltage of the water pump to the water pump. The water pump draws water from the water tank at the rated voltage and inputs it into the boiler. The boiler heats the water in the water tank to the second preset value to generate hot water. The water volume is the normal water volume of the water pump. The water pressure reaches the preset threshold value for the conduction of the coffee brewing unit. The hot water passes through the mechanical pressure valve and enters the coffee brewing unit to achieve brewing. If the milk frothing unit is switched directly to the coffee brewing unit, the water temperature in the boiler exceeds the second preset value, the control unit outputs a preset voltage lower than the rated voltage of the water pump to the water pump, the water pump pumps water from the water tank at the preset voltage and inputs it into the boiler for cooling, the cooled mixed water is output to the mechanical pressure valve, since the water volume is lower than the normal water volume pumped by the rated voltage of the water pump, the water flow pressure does not reach the preset threshold value for conduction of the coffee brewing unit, the mixed water is directly discharged by the mechanical pressure valve until the boiler is cooled to the second preset value and the coffee brewing unit is used again.

10. The method according to claim 9, characterized in that The preset voltage is 40% to 70% of the rated voltage; When the mechanical pressure valve includes a cone head, the mixed water is directly discharged by the mechanical pressure valve including: The mixed water flow with a lower water volume than normal enters the pressure relief chamber through the drain port. The water pressure does not reach the preset water pressure threshold for the coffee brewing unit to be turned on. The valve core fits the upper cover, the drain hole opens, and the water flows from the water hole and the drain hole to the waste water box.

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