An automated cold brew tea system and its control method

Abstract

This invention provides an automatic cold brew tea system, including a cold brew chamber, a water cup, a cold brew tube, a refrigeration component, and a control module. The cold brew chamber has its opening facing downwards and exchanges heat with the refrigeration component. The cold brew tube is located below and communicates with the cold brew chamber, and its lower end is connected to a tea container. The tea container has filters at both its bottom and top, and the cold brew tube can extend into the water cup. The control module includes a first water level probe, a second water level probe, a positive pressure pump, a negative pressure pump, a temperature sensor, a solenoid valve, and a controller. This system allows the tea essence to be maximally blended with water in a short time, resulting in cold brew tea with the best taste.

Description

Technical Field

[0001] This invention belongs to the field of household appliance technology, specifically relating to an automatic cold brewing tea system. Background Technology

[0002] Traditional tea brewing primarily involves hot brewing. When steeped in hot water, the alkaline substances in the tea leaves are rapidly released, resulting in a slightly bitter taste, especially with coarser, older tea leaves. A new brewing method has emerged – cold brewing. Cold brewing reduces the release of polyphenols and caffeine, thus minimizing bitterness and astringency while enhancing the tea's sweetness, aroma, and overall smoothness. It also makes the tea more resistant to multiple infusions.

[0003] Cold brew tea has become a popular health drink among many people today. The traditional method involves placing tea leaves in cold water and refrigerating them for at least eight hours. While this method yields a good taste, it is time-consuming and labor-intensive, and carries the risk of microbial contamination, failing to meet the demands of today's fast-paced lifestyle.

[0004] Invention patent CN202210104515.0 discloses an automatic cold brew tea machine, including a water inlet tank, a tea tray, a secondary buffer water tank, a water inlet mechanism, a drainage mechanism, a temperature sensor, a semiconductor refrigeration chip, and an encoder electronic board. The water inlet mechanism includes a water pump, a water outlet valve seat, a water pump inlet pipe, a water pump outlet pipe, and a water inlet pipe for the tea tray. The drainage mechanism includes a solenoid valve, a solenoid valve inlet pipe, and a solenoid valve outlet pipe. This patent uses inlet and outlet water pumps to circulate the water, and the water path inevitably involves pipes and a water pump piston mechanism, which can easily cause water pollution and make tea stains difficult to clean.

[0005] Invention patent CN202110979620.4 discloses a cold extraction device, which includes a shell, a cup, an ultrasonic generator, and a refrigeration component. The ultrasonic generator extracts cold or ice water and the extractant within the cup's containment cavity, while the refrigeration component simultaneously cools the cold or ice water and the extractant. This patent requires the addition of cold or ice water for extraction, which is not conducive to commercialization or automation. Furthermore, while using an ultrasonic generator to blend tea leaves with water results in high dissolution efficiency, it can easily lead to a low tea-water concentration at the upper water level and a high tea-water concentration at the lower water level, causing a separation of tea and water flavors. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides an automated cold brew tea system. It enables the tea essence to be fully integrated with water in a short time, resulting in cold brew tea with the best taste.

[0007] To achieve the objectives of this invention, the technical solution adopted is as follows:

[0008] An automatic cold brew tea system includes a cold brew chamber, a water cup, a cold brew tube, a refrigeration component, and a control module;

[0009] The cold extraction chamber has its opening facing downwards and exchanges heat with the refrigeration component;

[0010] The cold extraction tube is located below and communicates with the cold extraction chamber. The lower end of the cold extraction tube is connected to a tea container. The bottom and top of the tea container are equipped with filter screens. The cold extraction tube can extend into the water cup.

[0011] The control module includes a first water level probe, a second water level probe, a positive pressure pump, a negative pressure pump, a temperature sensor, a first solenoid valve, and a controller.

[0012] The first water level probe is used to monitor the water level in the water cup, the second water level probe is used to monitor the water level in the cold extraction chamber, the positive pressure pump and the negative pressure pump are connected to the top of the cold extraction chamber, the temperature sensor is used to monitor the temperature in the cold extraction chamber, and the first solenoid valve is used to control the opening and closing of the water cup inlet.

[0013] The input terminals of the refrigeration component, positive pressure pump, negative pressure pump, and first solenoid valve are connected to the output terminal of the controller, and the output terminals of the first water level probe, second water level probe, and temperature sensor are connected to the input terminal of the controller.

[0014] The negative pressure pump of this invention is connected to the No. 1 drainage pipe, and the positive pressure pump is connected to the No. 2 drainage pipe. The No. 1 and No. 2 drainage pipes are connected to one end of the No. 3 drainage pipe through a three-way solenoid valve. The other end of the No. 3 drainage pipe is connected to the water cup. The input end of the three-way solenoid valve is connected to the output end of the controller.

[0015] The refrigeration assembly of the present invention includes stainless steel condenser tubes arranged in a cold extraction chamber and a refrigeration compressor connected to the condenser tubes, wherein the input end of the refrigeration compressor is connected to the output end of a controller.

[0016] The cold extraction tube and tea container described in this invention are detachably connected, making it convenient to replace tea leaves or tea powder.

[0017] The end of the cold extraction tube of the present invention is connected to the cold extraction chamber above it via a connector, and the connector has a central channel running through both ends.

[0018] Preferably, the connector is further provided with a water injection channel, and the outlet of the water injection channel is the water inlet of the water cup.

[0019] Preferably, the negative pressure pump is connected to the No. 1 drainage pipe, the positive pressure pump is connected to the No. 2 drainage pipe, and the No. 1 and No. 2 drainage pipes are connected to the No. 3 drainage pipe through a three-way solenoid valve; the connector is provided with an overflow channel, one end of which is connected to the No. 3 drainage pipe, and the other end faces the water cup below.

[0020] The cold extraction chamber of the present invention is connected to a hot water pipe, the hot water pipe is connected to a heater, the outlet of the hot water pipe is provided with a second solenoid valve, and the heater and the second solenoid valve are connected to the output terminal of the controller.

[0021] The present invention also provides a control method for the automatic cold brew tea system, comprising the following steps:

[0022] S1. Pour drinking water into the cup, and stop pouring when the water level rises to the first water level probe;

[0023] S2. The negative pressure pump starts working. Under negative pressure, the drinking water passes through the tea bin and cold extraction pipe, rises to the cold extraction chamber, and rapidly drops in temperature in the cold extraction chamber through heat exchange with the refrigeration components.

[0024] S3. When the water level in the cold brew chamber rises to the second water level probe, the negative pressure pump stops working, and the positive pressure pump starts working at the same time. Under the action of positive pressure, the drinking water passes through the cold brew tube and tea hopper and returns to the water cup. When the water level in the water cup rises to the first water level probe, the positive pressure pump stops working, and the negative pressure pump starts working at the same time, returning to step S2, and repeating the cycle.

[0025] Preferably, hot water at 80-85℃ is poured into the cup for 5-10 seconds first, and then drinking water is poured into the cup.

[0026] Preferably, the cold extraction time is 30-60 min, the positive pressure pump pressure is >120 kPa, and the negative pressure pump pressure is <-60 kPa.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. This invention sets up a positive pressure pump and a negative pressure pump in the cold brewing chamber. Water level signals are transmitted through a first water level probe and a second water level probe to control the alternating operation of the positive pressure pump and the negative pressure pump. The water temperature is rapidly cooled to a specified temperature. Drinking water continuously passes through the tea leaves and enters and exits the cold brewing chamber. During the cold brewing process, the water flow keeps moving up and down between the water cup and the cold brewing chamber. In this low-temperature environment, the cooling water also repeatedly washes the tea leaves up and down, allowing the tea essence to blend with the water to the maximum extent, resulting in cold brewed tea with the best taste.

[0029] 2. This invention uses a positive and negative pressure vacuum pump. The pump body only generates positive and negative air pressure on the water, and the pump body does not circulate water, so it will not pollute the water quality. Furthermore, applying pressure to the water can accelerate the water flow rate, promote the fusion of tea leaves and water, and complete cold brewing in 1 hour, significantly speeding up the fusion process.

[0030] 3. By connecting the positive pressure pump and negative pressure pump to the water cup through the drainage pipe, a closed-loop connection is formed. Even if the water level probe malfunctions, drinking water will not overflow the cup, and the system can continue to operate, maintaining water circulation and sustaining the cold extraction process. On the other hand, during normal cold extraction, when the negative pressure pump is working, the drainage pipe introduces positive pressure downwards from above the water cup, propelling water upwards into the negative pressure environment within the cold extraction tube more quickly. When the positive pressure pump is working, the drainage pipe introduces negative pressure from above the water cup, and the positive pressure environment within the cold extraction tube helps water flow downwards back into the water cup, further accelerating the water circulation speed and saving time and energy.

[0031] 4. Stainless steel condenser tubes are used in the cold extraction chamber to exchange heat with the water, which will not affect the water quality. It can quickly reduce the water temperature, achieve instant cooling, and also achieve energy saving.

[0032] 5. Adding a hot water pipe to the cold brewing chamber allows hot water to enter the tea hopper below, wetting the surface of the tea leaves, melting the wax layer on the surface, and then cold brewing, which can further shorten the cold brewing time. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the automatic cold brew tea system of the present invention.

[0034] Figure 2 This is a schematic diagram of the cold extraction process of the automatic cold extraction tea system of the present invention.

[0035] Figure 3 This is a schematic diagram of the automatic cold brew tea system in Example 2.

[0036] Figure 4 This is a schematic diagram of the cold extraction process of the automatic cold extraction tea system in Example 2.

[0037] Figure 5 This is a schematic diagram of the automatic cold brew tea system of Example 6.

[0038] Figure 6 This is a schematic diagram of the external structure of the automatic cold brew tea system in Example 7.

[0039] Figure 7 This is a block diagram illustrating the control principle of the automatic cold-brew tea system of the present invention.

[0040] Figure 8 This is a block diagram illustrating the control principle of the automatic cold brew tea system in Example 2.

[0041] Figure 9 This is a block diagram illustrating the control principle of the automatic cold-brew tea system in Example 6.

[0042] Reference numerals: 1. Cold brew chamber; 2. Water cup; 3. Cold brew tube; 4. Condenser tube; 5. Tea container; 6. First water level probe; 7. Second water level probe; 8. Positive pressure pump; 9. Negative pressure pump; 10. Connector; 11. Central channel; 12. Water inlet channel; 13. Overflow channel; 14. Drainage pipe No. 2; 15. Drainage pipe No. 1; 16. Drainage pipe No. 3; 17. Three-way solenoid valve; 18. Temperature sensor; 19. Housing; 20. Shelf; 21. Hot water pipe; 22. Heater; 51. Filter screen; 121. Water inlet; 201. Slide groove. Detailed Implementation

[0043] To more clearly and in detail illustrate the objective and technical solution of this invention, the invention will be further described below through relevant embodiments. These embodiments are merely illustrative of the implementation methods of this invention and do not limit the scope of protection of this invention.

[0044] Example 1

[0045] like Figure 1 As shown, an automatic cold brew tea system includes a cold brew chamber 1, a water cup 2, a cold brew tube 3, a refrigeration component, and a control module;

[0046] The cold extraction chamber 1 has its opening facing downwards and exchanges heat with the refrigeration component;

[0047] The cold extraction tube 3 is located below the cold extraction chamber 1 and communicates with the cold extraction chamber 1. The lower end of the cold extraction tube 3 is connected to the tea container 5. The bottom and top of the tea container 5 are equipped with filter screens 51. The cold extraction tube 3 can extend into the water cup 2.

[0048] like Figure 7 As shown, the control module includes a first water level probe 6, a second water level probe 7, a positive pressure pump 8, a negative pressure pump 9, a temperature sensor 18, a first solenoid valve, and a controller.

[0049] The first water level probe 6 is used to monitor the water level in the water cup 2, and the second water level probe 7 is used to monitor the water level in the cold extraction chamber 1; the positive pressure pump 8 and the negative pressure pump 9 are connected to the top of the cold extraction chamber 1, the temperature sensor 18 is used to monitor the temperature in the cold extraction chamber 1, and the first solenoid valve is used to control the opening and closing of the water cup inlet 121.

[0050] The input terminals of the refrigeration component, positive pressure pump 6, negative pressure pump 7, and first solenoid valve are connected to the output terminal of the controller, and the output terminals of the first water level probe 8, second water level probe 9, and temperature sensor 18 are connected to the input terminal of the controller.

[0051] The working principle is as follows: The cold extraction tube 3 is placed in the water cup 2. The first solenoid valve is opened to inject drinking water into the water cup 2. When the water level rises to the first water level probe 6, a signal is sent to the controller, the first solenoid valve closes, and the water injection stops. At the same time, the negative pressure pump 9 starts. Under the action of negative pressure, the drinking water passes through the tea chamber 5 and the cold extraction tube 3 and rises to the cold extraction chamber 1. The refrigeration component starts, and the water temperature in the cold extraction chamber 1 drops rapidly.

[0052] When the water level in the cold brew chamber 1 rises to the second water level probe 7, a signal is sent to the controller, commanding the negative pressure pump 9 to shut down, while the positive pressure pump 8 starts. Under positive pressure, the drinking water passes through the cold brew tube 3 and the tea chamber 5, and returns to the water cup 2. When the water level in the water cup 2 rises to the first water level probe 6 again, a signal is sent to the controller, commanding the positive pressure pump to shut down, while the negative pressure pump starts, and the cycle repeats.

[0053] During the cold extraction process, temperature sensor 18 monitors the temperature inside the cold extraction chamber 1 in real time and transmits the data to the controller. By controlling the switching of the refrigeration components, the cold extraction chamber 1 is kept at a constant low temperature of 4°C. The cold extraction time can be precisely preset. During the long-term alternating operation of the positive and negative pressure pumps, drinking water continuously passes through the tea leaves and enters and exits the cold extraction chamber. The water flow during the cold extraction process maintains an up-and-down reciprocating flow between the water cup and the cold extraction chamber. Figure 2 On the one hand, the water temperature is rapidly cooled to the specified temperature, and the cooling water is repeatedly passed through the tea chamber in this low-temperature environment. Cold brewing can be completed in 1 hour, allowing the tea essence to blend with the water to the maximum extent, resulting in cold-brewed tea with the best taste.

[0054] This invention allows for precise control of cold extraction time, temperature, and positive and negative pressure intensity via an input module.

[0055] The water cup's inlet can be connected to a water storage container via a pipe, or it can be connected to an external water dispenser.

[0056] Example 2

[0057] This embodiment is based on embodiment 1:

[0058] like Figure 3 As shown, the negative pressure pump 9 is connected to the first drainage pipe 15, and the positive pressure pump is connected to the second drainage pipe 14. The first drainage pipe 15 and the second drainage pipe 14 are connected to one end of the third drainage pipe 16 through a three-way solenoid valve 17. The other end of the third drainage pipe 16 is connected to the water cup 2. The input end of the three-way solenoid valve 17 is connected to the output end of the controller.

[0059] like Figure 4 As shown, the working principle is as follows: air flows inside the drainage tube. When the negative pressure pump is working, the three-way solenoid valve 17 is closed, drainage tubes 1 and 3 are open, and drainage tube 2 is closed. Drainage tube 3 introduces positive pressure from the top and bottom of the water cup, pushing the water into the negative pressure environment inside the cold extraction tube 3 more quickly.

[0060] When the positive pressure pump is working, the three-way solenoid valve 17 is open, the No. 2 and No. 3 drainage pipes are open, and the No. 1 drainage pipe is closed. The No. 3 drainage pipe introduces negative pressure from above the water cup. The positive pressure environment in the cold extraction tube can help the water flow back down into the water cup, thereby further accelerating the water circulation speed, saving more time and energy, and further shortening the cold extraction time to less than 1 hour.

[0061] When the water level in cold extraction chamber 1 rises to the second water level probe 7, if the probe malfunctions and cannot send a signal to the controller, the negative pressure pump 9 continues to operate. Under continuous negative pressure, drinking water enters the negative pressure pump at the top, flows out from the pump's exhaust port, enters the third drain pipe through the first drain pipe, and then returns to the water cup through the third drain pipe. Water in water cup 2 continues to flow upwards into cold extraction chamber 1 under negative pressure, circulating continuously. During the cold extraction process, the water flows counterclockwise in a closed loop within the water cup, cold extraction chamber, and drain pipes.

[0062] When the water level in water cup 2 rises to the first water level probe 6, if the probe malfunctions and cannot send a signal to the controller, the positive pressure pump 8 continues to operate. Under continuous positive pressure, drinking water enters the top inlet pipe 3, then through inlet pipe 2 into the positive pressure pump, and finally from the pump's exhaust port into the cold extraction chamber 1. Under positive pressure, the water in the cold extraction chamber 1 continues to flow downwards into water cup 2, circulating continuously. During the cold extraction process, the water flows clockwise in a closed loop within the water cup, cold extraction chamber, and inlet pipes.

[0063] Example 3

[0064] This embodiment is based on embodiment 1:

[0065] The refrigeration assembly includes stainless steel condenser tubes 4 arranged in the cold extraction chamber and a refrigeration compressor connected to the condenser tubes. The input end of the refrigeration compressor is connected to the output end of the controller.

[0066] The present invention can also use other alternative heat exchange devices such as semiconductor refrigeration chips. It is preferred to use a micro variable frequency compressor for refrigeration, which consumes less energy than semiconductor refrigeration. The electrical energy consumed by semiconductor refrigeration is about three times that of compressor refrigeration.

[0067] The cold extraction tube 3 and the tea chamber 5 are detachably connected, making it convenient to replace tea leaves or tea powder.

[0068] Example 4

[0069] This embodiment is based on embodiment 1:

[0070] The end of the cold extraction tube 3 is connected to the cold extraction chamber 1 above via a connector 10, and the connector 10 has a central channel 11 that runs through both ends.

[0071] The connector 10 is also provided with a water injection channel 12, and the vent of the water injection channel 12 is the water inlet 121 of the water cup.

[0072] The bottom of the connector 10 is provided with a downward-facing first water level probe 6.

[0073] Example 5

[0074] This embodiment is based on embodiment 4:

[0075] like Figure 3 As shown, the negative pressure pump 9 is connected to the drainage pipe 15, and the positive pressure pump 8 is connected to the drainage pipe 2 14. The drainage pipe 15 and the drainage pipe 2 14 are connected to the drainage pipe 3 16 through the three-way solenoid valve 17. The connector 10 is provided with an overflow channel 13. One end of the overflow channel 13 is connected to the drainage pipe 3, and the other end faces the water cup 2 below.

[0076] The connector 10 is a stepped flange, with the end with the smaller outer diameter facing downwards, and the mouth of the water cup 2 is larger than the outer diameter of that end.

[0077] Example 6

[0078] This embodiment is based on embodiment 1:

[0079] like Figure 5 and Figure 9 As shown, the cold extraction chamber 1 is connected to a hot water pipe 21, the hot water pipe 21 is connected to a heater 22, the outlet of the hot water pipe 33 is equipped with a second solenoid valve, and the heater 21 and the second solenoid valve are connected to the output terminal of the controller.

[0080] Hot water enters the water cup below through the cold brewing chamber. Before adding water, a small amount of hot water is added to melt the wax layer on the surface of the tea leaves. The heater is a rapid heater that uses resistance wire to heat the water pipe. The water source can be a built-in or external water tank.

[0081] Example 7

[0082] This embodiment is based on embodiment 1:

[0083] like Figure 6 As shown, a pull-out shelf 20 for placing water cups is provided on the upright part of the casing. Using the pull-out shelf, before placing the water cup, the shelf is retracted; after the cold extraction tube is placed into the water cup, the shelf is pulled out again to place the water cup.

[0084] Example 8

[0085] The present invention also provides a control method for an automatic cold brew tea system, comprising the following steps:

[0086] S1. Pour drinking water into the cup, and stop pouring when the water level rises to the first water level probe;

[0087] S2. The negative pressure pump starts working. Under negative pressure, the drinking water passes through the tea bin and cold extraction pipe, rises to the cold extraction chamber, and rapidly drops in temperature in the cold extraction chamber through heat exchange with the refrigeration components.

[0088] S3. When the water level in the cold brew chamber rises to the second water level probe, the negative pressure pump stops working, and the positive pressure pump starts working at the same time. Under the action of positive pressure, the drinking water passes through the cold brew tube and tea hopper and returns to the water cup. When the water level in the water cup rises to the first water level probe, the positive pressure pump stops working, and the negative pressure pump starts working at the same time, returning to step S2, and repeating the cycle.

[0089] The cold extraction time of this invention is about 60 minutes, the positive pressure pump pressure is >120 kPa, and the negative pressure pump pressure is <-60 kPa.

[0090] Example 9

[0091] This embodiment is based on embodiment 8:

[0092] First, pour hot water (80-85℃) into the cup for 5-10 seconds, then pour in drinking water.

[0093] Before adding hot water, heat the water into the tea chamber below. This hot water instantly breaks down the wax layer on the tea leaves, allowing for a subsequent 30-40 minute cold brew cycle to achieve an excellent taste. A water temperature of 80-85℃ effectively washes away the wax layer without significantly affecting the internal structure of the tea leaves. The rinsing time should be controlled to 5-10 seconds; excessive rinsing may lead to excessive loss of the tea's internal substances, thus affecting its taste and quality.

[0094] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An automatic cold brew tea system, characterized in that, Includes cold extraction chamber, water cup, cold extraction tube, refrigeration components and control module; The cold extraction chamber has its opening facing downwards, allowing for heat exchange with the refrigeration component; The cold extraction tube is located below and communicates with the cold extraction chamber. The lower end of the cold extraction tube is connected to a tea container. The bottom and top of the tea container are equipped with filter screens. The cold extraction tube can extend into the water cup. The control module includes a first water level probe, a second water level probe, a positive pressure pump, a negative pressure pump, a temperature sensor, a first solenoid valve, and a controller. The first water level probe is used to monitor the water level in the water cup, the second water level probe is used to monitor the water level in the cold extraction chamber, the positive pressure pump and the negative pressure pump are connected to the top of the cold extraction chamber, the temperature sensor is used to monitor the temperature in the cold extraction chamber, and the first solenoid valve is used to control the opening and closing of the water cup inlet. The input terminals of the refrigeration component, positive pressure pump, negative pressure pump and first solenoid valve are connected to the output terminal of the controller, and the output terminals of the first water level probe, second water level probe and temperature sensor are connected to the input terminal of the controller. The negative pressure pump is connected to the No. 1 drainage pipe, and the positive pressure pump is connected to the No. 2 drainage pipe. The No. 1 and No. 2 drainage pipes are connected to one end of the No. 3 drainage pipe through a three-way solenoid valve. The other end of the No. 3 drainage pipe is connected to the water cup. The input end of the three-way solenoid valve is connected to the output end of the controller.

2. The automatic cold brew tea system according to claim 1, characterized in that, The refrigeration assembly includes stainless steel condenser tubes arranged in the cold extraction chamber and a refrigeration compressor connected to the condenser tubes. The input end of the refrigeration compressor is connected to the output end of the controller.

3. The automatic cold brew tea system according to claim 1, characterized in that, The cold extraction tube and the tea container are detachably connected.

4. The automatic cold brew tea system according to claim 1, characterized in that, The end of the cold extraction tube is connected to the cold extraction chamber above via a connector, and the connector has a central channel running through both ends.

5. The automatic cold brew tea system according to claim 4, characterized in that, The connector is also provided with a water injection channel, and the outlet of the water injection channel is the water inlet of the water cup.

6. The automatic cold brew tea system according to claim 4, characterized in that, The negative pressure pump is connected to the No. 1 drainage pipe, and the positive pressure pump is connected to the No. 2 drainage pipe. The No. 1 and No. 2 drainage pipes are connected to the No. 3 drainage pipe through a three-way solenoid valve. An overflow channel is provided in the connector. One end of the overflow channel is connected to the No. 3 drainage pipe, and the other end faces the water cup below.

7. The automatic cold brew tea system according to claim 1, characterized in that, The cold extraction chamber is connected to a hot water pipe, which is connected to a heater. A second solenoid valve is installed at the outlet of the hot water pipe. The heater and the second solenoid valve are connected to the output of the controller.

8. The control method of the automatic cold brew tea system according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Pour drinking water into the cup, and stop pouring when the water level rises to the first water level probe; S2. The negative pressure pump starts working. Under negative pressure, the drinking water passes through the tea bin and cold extraction pipe, rises to the cold extraction chamber, and rapidly drops in temperature in the cold extraction chamber through heat exchange with the refrigeration components. S3. When the water level in the cold brew chamber rises to the second water level probe, the negative pressure pump stops working, and the positive pressure pump starts working at the same time. Under the action of positive pressure, the drinking water passes through the cold brew tube and tea hopper and returns to the water cup. When the water level in the water cup rises to the first water level probe, the positive pressure pump stops working, and the negative pressure pump starts working at the same time, returning to step S2, and repeating the cycle.

9. The control method for the automatic cold brew tea system according to claim 8, characterized in that, First, pour hot water (80-85℃) into the cup for 5-10 seconds, then pour in drinking water.

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