Pressure control method and device and storage medium

Abstract

The embodiment of the invention provides a pressure control method and device and a storage medium, and the method comprises the steps that the water outlet flow of an extraction pump is detected through a flow meter installed at the downstream of the extraction pump, when the water outlet pressure changes, the corresponding water outlet flow changes correspondingly, and therefore the pressure of the extraction pump is controlled. The water outlet pressure of the extraction pump can be reflected laterally by detecting the water outlet flow of the extraction pump, real-time monitoring of the water outlet pressure is achieved, if a pressure difference exists between the water outlet pressure and the target extraction pressure, the output power of the extraction pump is adjusted according to the pressure difference, the extraction pump can work at the target extraction pressure, and the extraction efficiency is improved. And the pressure control requirement of coffee extraction is met.

Description

Technical Field

[0001] This invention relates to the field of coffee machine technology, and more particularly to pressure control methods, devices and storage media. Background Technology

[0002] Coffee extraction is mainly divided into two categories: cold brew coffee extraction and hot brew coffee extraction. Cold brew coffee typically uses a low-temperature extraction method. Cold water is pressurized by a high-pressure pump to extract coffee grounds under high pressure, and the coffee liquid is finally output from the extraction port. Its extraction process mainly relies on pressure to achieve efficient extraction under low-temperature conditions. Hot brew coffee, on the other hand, often uses high-temperature hot water to brew or spray coffee grounds for extraction. This can be achieved through atmospheric pressure drip filtration or by pressurizing with a high-pressure pump to create high-pressure hot extraction.

[0003] During coffee extraction, extraction pressure directly affects the extraction rate, the degree of extraction, and the final taste and flavor. Stable and precise control of extraction pressure is a key factor in ensuring consistent coffee extraction quality and flavor. Summary of the Invention

[0004] The main objective of this invention is to provide a pressure control method, apparatus, and storage medium, aimed at accurately controlling coffee extraction pressure. The technical solution is as follows: In a first aspect, embodiments of this application provide a pressure control method applied to a coffee machine. The coffee machine includes a cold water tank, a cold water circuit, and an extraction module. The cold water tank has a cold water chamber for storing cold water. The cold water circuit includes a cold water pipe and a cold water pump, an extraction pump, and a flow meter sequentially arranged along the water flow direction on the cold water pipe. The inlet end of the cold water pipe is connected to the cold water chamber, and the outlet end of the extraction pump is connected to the extraction module. The flow meter is used to detect the outlet flow rate of the extraction pump. The method includes: The flow rate of the extraction pump detected by the flow meter is obtained, and the outlet pressure of the extraction pump is determined based on the flow rate. The pressure difference is obtained by determining the difference between the effluent pressure and the target extraction pressure; The output power of the extraction pump is determined based on the pressure difference. The extraction pump is controlled according to the output power to adjust it to the target extraction pressure.

[0005] Secondly, embodiments of this application provide a pressure control device, the device comprising: The outlet pressure determination unit is used to acquire the outlet flow rate of the extraction pump detected by the flow meter, and determine the outlet pressure of the extraction pump based on the outlet flow rate. The difference calculation unit is used to determine the difference between the effluent pressure and the target extraction pressure to obtain the pressure difference; A power determination unit is used to determine the output power of the extraction pump based on the pressure difference. The operation control unit is used to control the operation of the extraction pump according to the output power, so as to adjust the extraction pump to the target extraction pressure.

[0006] Thirdly, embodiments of this application provide a storage medium storing a computer program, which, when executed by a processor, implements the steps of the method described above.

[0007] In the embodiments of this invention, the water flow rate of the extraction pump is detected by a flow meter installed downstream of the extraction pump. When the water pressure changes, the corresponding water flow rate also changes accordingly. Therefore, by detecting the water flow rate of the extraction pump, the water pressure of the extraction pump can be reflected indirectly, realizing real-time monitoring of the water pressure. If there is a pressure difference between the water pressure and the target extraction pressure, the output power of the extraction pump is adjusted according to the pressure difference, so that the extraction pump can work at the target extraction pressure and meet the pressure control requirements of coffee extraction. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of a coffee machine provided in an embodiment of this invention. Figure 2 This is a schematic diagram of the flow path of a coffee machine provided in an embodiment of this invention. Figure 3 This is a schematic flowchart of a pressure control method provided in an embodiment of this invention. Figure 4 This is a schematic flowchart of a pressure control method provided in an embodiment of this invention. Figure 5 This is a schematic diagram of the performance data of an extraction pump provided in an embodiment of this invention application; Figure 6 This is a flow path diagram of another coffee machine provided in an embodiment of this invention; Figure 7 This is a flow path diagram of another coffee machine provided in an embodiment of the present invention; Figure 8This is a flow path diagram of another coffee machine provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a pressure control device provided in an embodiment of the present invention.

[0010] Explanation of reference numerals in the attached figures: 1. Outer shell assembly; 11. Front panel; 12. Base; 13. Top plate; 14. Side plate; 10. Cold water tank; 101. Cold water chamber; 102. Ice storage chamber; 20. Cold water circuit; 201. Cold water pipe; 202. Cold water pump; 203. Extraction pump; 204. Flow meter; 30. Extraction module; 301. Extraction tube; 302. Extraction device; 40. Pressurized instant heating component; 50. Raw water tank; 60. Pure water circuit; 70. Refrigeration module. Detailed Implementation

[0011] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this specification.

[0012] In the description of this specification, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this specification, it should be noted that, unless otherwise expressly specified and limited, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices. Those skilled in the art can understand the specific meaning of the above terms in this specification based on the specific circumstances. Furthermore, in the description of this specification, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0013] Please see Figure 1This is a schematic diagram of the appearance of a coffee machine according to an embodiment of this application. Specifically, the coffee machine of this embodiment includes a housing assembly 1, a cold water tank (not shown inside the coffee machine), a cold water circuit (not shown inside the coffee machine), and an extraction module 30. The housing assembly 1 includes a front panel 11, a base 12, a top plate 13, and a side plate 14. The front panel 11, the base 12, the top plate 13, and the side plate 14 enclose each other to form an installation space, thereby installing functional components and pipelines such as the cold water tank, the cold water circuit, and the extraction module 30 inside the coffee machine.

[0014] It is understandable that the appearance of the coffee machine described above is merely an example and is not intended to be specific.

[0015] Please see also Figure 2 , Figure 2 This application provides a flow path diagram of a coffee machine according to an embodiment of the present application. In this flow path diagram, the coffee machine includes a cold water tank 10, a cold water path 20, and an extraction module 30. The cold water path 20 is a pipeline for transporting cold water. In this embodiment, the cold water path 20 includes a cold water pipe 201 and a cold water pump 202, an extraction pump 203, and a flow meter 204 sequentially arranged along the water flow direction on the cold water pipe 201. The inlet end of the cold water pipe 201 is connected to the cold water chamber 101, and the outlet end of the extraction pump 203 is connected to the extraction module 30. The cold water pipe can be a flexible or rigid pipe. The cold water pump 202 is used to extract cold water from the cold water tank and transport it to the extraction module 30. The extraction pump 203 is used to increase the water pressure to ensure that the water flows through the extraction module 30. The flow meter 204 is located downstream of the extraction pump 203 and is arranged on the cold water pipe 201 to detect the water flow rate of the extraction pump 203. The cold water entering the cold water tank is stored in the cold water chamber 101. The cold water in the cold water chamber enters the cold water pipe 201, is drawn out by the cold water pump 202, and is pressurized by the extraction pump 203. The flow meter 204 detects the outlet water pressure of the extraction pump 203 before it is delivered to the extraction module 30. In this way, the stability of water flow and the required extraction pressure are ensured, and the stability of extraction is improved.

[0016] Based on the above structure, this invention provides a pressure control method to ensure that the extraction pump can reach the pressure requirements during extraction. By acquiring the water flow rate of the extraction pump detected by a flow meter, the water pressure of the extraction pump is determined based on the water flow rate. The difference between the water pressure and the target extraction pressure is determined to obtain the pressure difference. The output power of the extraction pump is determined based on the pressure difference, and the pump is controlled to operate according to the output power to adjust the extraction pump to the target extraction pressure. By indirectly reflecting the water pressure through the water flow rate, real-time monitoring of the extraction pressure can be achieved without the need for an additional pressure sensor, simplifying the system structure and reducing hardware costs and piping layout complexity. By comparing the water flow rate with the target extraction pressure and adjusting the output power of the extraction pump in real time based on the pressure difference, the extraction pressure can be quickly and accurately stabilized at the target extraction pressure, avoiding under- or over-extraction of coffee due to fluctuations in water pressure.

[0017] For example, the pressure control method in the embodiments of this invention can be executed by a pressure control device, which can be a coffee machine or a specific control device in the coffee machine.

[0018] The pressure control method provided in this specification will be described in detail below with reference to specific embodiments.

[0019] Please see Figure 3 This is a schematic flowchart illustrating a pressure control method provided in an embodiment of the present invention. Figure 3 As shown, the pressure control method provided in the embodiments of this invention may include the following steps S101-S104.

[0020] S101, obtain the water flow rate of the extraction pump detected by the flow meter, and determine the water pressure of the extraction pump based on the water flow rate; In one embodiment, a flow meter is installed downstream of the extraction pump to collect the water flow rate signal output by the extraction pump in real time. Given a fixed extraction water path structure, there is a corresponding relationship between the extraction pump's outlet pressure and outlet flow rate: when the outlet pressure changes, the outlet flow rate changes accordingly. Therefore, the detected outlet flow rate can indirectly reflect the extraction pump's outlet pressure, thereby achieving real-time monitoring of the outlet pressure.

[0021] Understandably, flow rate detection has higher stability and anti-interference capabilities compared to direct pressure detection. Therefore, it helps to improve the accuracy and consistency of pressure control in the coffee extraction process, ensuring a stable coffee taste.

[0022] S102, determine the difference between the effluent pressure and the target extraction pressure to obtain the pressure difference; In one embodiment, after obtaining the current outlet water pressure, it is compared with the system-preset or user-selected target extraction pressure, and the difference between the two is calculated to obtain the pressure difference. This pressure difference is used to characterize the magnitude and direction of the deviation between the current extraction pressure and the target extraction pressure, providing a basis for subsequent adjustment of the extraction pump's output power and ensuring that the pressure adjustment has a clear direction.

[0023] S103, determine the output power of the extraction pump based on the pressure difference; In one embodiment, based on the obtained pressure difference, the required output power of the extraction pump is calculated and determined using a preset power adjustment strategy. In a feasible implementation, when the outlet water pressure is lower than the target extraction pressure, the output power of the extraction pump is increased accordingly; when the outlet water pressure is higher than the target extraction pressure, the output power of the extraction pump is decreased accordingly, so that the adjustment of the output power matches the pressure deviation, achieving precise adjustment.

[0024] Alternatively, in one embodiment, based on the outlet water pressure With target extraction pressure difference Perform PID control:

[0025] The PID control algorithm, commonly used in the control field, is adopted, based on pressure difference. As input, the power output of the extraction pump As the control variable, the required output power P of the extraction pump is calculated using the PID control formula to achieve precise correction of the pressure deviation. The PID control formula is as follows:

[0026] Among them, , , It is determined by engineers through laboratory tests and preset into the control algorithm. For pressure difference The integral term from the initial time to the current time is used to eliminate static error. For pressure difference The derivative term with respect to time is used to predict the changing trend of pressure deviation, allowing for advance adjustments and reducing fluctuations.

[0027] when When the current pressure is lower than the target pressure, a higher output power P is calculated using the PID formula to increase the extraction pump power, thereby increasing the outlet water pressure; when When the current pressure is less than 0 (the target pressure is higher than the target pressure), a lower output power P is calculated to reduce the extraction pump power, thereby reducing the outlet water pressure; when... When the coefficient of performance (COP) is 0, the output power P remains stable, maintaining the current pressure. Through the coordinated action of the proportional, integral, and derivative functions of the PID algorithm, the speed, accuracy, and stability of pressure regulation are achieved.

[0028] S104, control the operation of the extraction pump according to the output power to adjust the extraction pump to the target extraction pressure.

[0029] In one embodiment, the obtained output power is converted into a control signal and transmitted to the extraction pump to control the extraction pump to operate stably at the output power.

[0030] In the embodiments of this invention, the water flow rate of the extraction pump is detected by a flow meter installed downstream of the extraction pump. When the water pressure changes, the corresponding water flow rate also changes accordingly. Therefore, by detecting the water flow rate of the extraction pump, the water pressure of the extraction pump can be reflected indirectly, realizing real-time monitoring of the water pressure. If there is a pressure difference between the water pressure and the target extraction pressure, the output power of the extraction pump is adjusted according to the pressure difference, so that the extraction pump can work at the target extraction pressure and meet the pressure control requirements of coffee extraction.

[0031] Please see Figure 4 , Figure 4 This is a schematic flowchart of a pressure control method provided in an embodiment of this invention. Figure 4 As shown, the pressure control method provided in the embodiments of this invention may include the following steps S201-S210.

[0032] S201, according to a preset time interval, the flow rate of the extraction pump detected by the flow meter is obtained, and the flow pressure of the extraction pump is determined based on the flow rate. In one embodiment, a timed detection logic is added to ensure the continuity and stability of pressure monitoring, while avoiding the waste of controller computing power caused by real-time detection. The preset time interval is determined by engineers through laboratory measurements and pre-set into the control algorithm. According to the preset time interval, the flow meter collects the downstream water flow rate of the extraction pump in real time, calls the preset pipeline pressure-flow function relationship, calculates the current water pressure of the extraction pump, and completes a single pressure detection. By repeatedly executing this step at timed intervals, continuous monitoring of the extraction pump's water pressure is achieved, providing real-time and continuous data support for subsequent pressure regulation.

[0033] Please see Figure 5 , Figure 5 This is a schematic diagram illustrating the performance data of an extraction pump provided in an embodiment of this invention. For example, an extraction pump with an operating pressure range of 0-23 bar is selected, and the pressure value and corresponding flow rate are measured to obtain... Figure 5 The data in the table on the left is used to generate... Figure 5The diagram on the right shows the relationship. Because the flow rate data varies depending on the outlet water pressure, engineers obtained this information through laboratory simulations. Figure 5 The experimental data shown were used to fit the predicted pipeline pressure values. With traffic The functional relationship is as follows: .

[0034] S202, Obtain the coffee type selected by the user; In one embodiment, the user's coffee drinking needs are obtained to provide a basis for determining the target extraction pressure, making the pressure control more suitable for the extraction characteristics of different coffees. Specifically, the system is equipped with a coffee type selection module (which can be operated via buttons, touch screen, remote commands, etc.). Users can select the corresponding type from preset coffee types according to their own needs. The preset coffee types are pre-set by engineers based on common coffee extraction needs, preferably including espresso, Americano, pour-over coffee, cold brew coffee, etc.

[0035] S203, determine the target extraction pressure based on the coffee type; In one embodiment, the user-selected coffee type is matched with the corresponding target extraction pressure.

[0036] Specifically, the target extraction pressure can be obtained by looking up a preset coffee type-target extraction pressure correspondence table. This correspondence table is calibrated by engineers through a large number of laboratory tests. Combining the particle size, extraction time, and flavor requirements of different coffees, the optimal target extraction pressure for each coffee type is determined and preset into the control algorithm.

[0037] For example, the extraction pressure adjusted in this embodiment is mainly used for cold brew coffee. The target extraction pressure for cold brew coffee is between 3 and 5 bar, preferably 4 bar.

[0038] S204, determine the difference between the effluent pressure and the target extraction pressure to obtain the pressure difference; In one embodiment, the pressure difference is obtained by determining the difference between the currently detected effluent pressure and the target extraction pressure.

[0039] S205, Obtain the minimum regulating pressure value of the extraction pump; In one embodiment, to avoid frequent system adjustments, the acquired pressure difference is compared with the minimum adjustment pressure value. If the pressure difference is within the acceptable range, the system will proceed to the next constant pressure treatment step; otherwise, constant pressure treatment will not be performed in this round. Here, the absolute value of the pressure difference is used to account for both excessively high and low pressure deviations.

[0040] S206, if the pressure difference is greater than the minimum adjustment pressure value, then the output power of the extraction pump is determined based on the pressure difference; In one embodiment, if the pressure difference is greater than the minimum adjustable pressure value, it indicates that the current pressure deviation is large, which affects the coffee extraction effect. Power adjustment needs to be performed, and the output power required by the extraction pump corresponding to the pressure difference is calculated.

[0041] S207, compare the output power with the set maximum value and minimum value of a single change respectively; In one embodiment, the maximum and minimum values ​​of a single change are power thresholds determined and preset by engineers through laboratory measurements based on the rated power of the extraction pump, motor performance, and coffee extraction pressure requirements. These thresholds are used to protect the extraction pump motor and extend its service life. The output power P of the extraction pump must meet the following requirements: If the output exceeds this set range, the final output power will remain at the corresponding maximum value. or minimum value Avoid over-adjusting the power.

[0042] S208, if the output power is less than the minimum value of a single change, then the minimum value of a single change is updated to the output power; In one embodiment, if the output power is less than the minimum value of a single change, the target output power is not used directly. Instead, the minimum value of a single change is used as the final output power to ensure that the output power is not lower than a preset lower limit and to maintain the basic stability of the extraction pressure.

[0043] S209, if the output power is greater than the maximum value of a single change, then the maximum value of a single change is updated to the output power; In one embodiment, if the output power is greater than the maximum value of a single change, the target output power is not used directly. Instead, the maximum value of a single change is used as the final output power to ensure that the output power does not exceed the preset upper limit. This avoids a sudden increase in water pressure due to excessive power, which could damage equipment components or affect the taste of coffee extraction.

[0044] If the output power is between the minimum and maximum values ​​of a single change, no correction is needed, and the output power can be used directly.

[0045] S210, control the operation of the extraction pump according to the output power to adjust the extraction pump to the target extraction pressure.

[0046] In one embodiment, the determined output power is converted into a control signal and transmitted to the extraction pump, controlling the extraction pump to operate stably at that power. This, in turn, causes the outlet water pressure to gradually approach and stabilize at the target extraction pressure.

[0047] In the embodiments of this invention, continuous and stable monitoring of the water pressure is achieved through timed detection at preset intervals, avoiding the waste of computing power in real-time detection and the deviation of intermittent detection. By obtaining the user's selected coffee type and matching the corresponding target extraction pressure, precise adaptation to the extraction characteristics of different coffees is achieved, solving the shortcomings of traditional fixed pressure control that cannot take into account the taste of multiple types of coffee, and meeting the user's personalized drinking needs. Furthermore, by adjusting the minimum pressure value, minor deviations are filtered out, reducing pressure fluctuations caused by frequent adjustments; by limiting the sudden changes in output power through the minimum and maximum values ​​of a single change, sudden increases and decreases in extraction pump power that exceed the controllable power range are prevented, ensuring that the water pressure steadily approaches the target value, effectively solving the problems of under-extraction, over-extraction, or uneven taste, and achieving precise pressure control.

[0048] Please see Figure 6 , Figure 6 This is a schematic diagram of the flow path of another coffee machine provided in an embodiment of the present invention. In one embodiment, the coffee purification system further includes a pressurized instant heating component 40, with its water inlet end connected to the cold water pipe; and an extraction module 30, including an extraction tube 301 and an extraction device 302. One end of the extraction tube 301 is connected to the water outlet end of the pressurized instant heating component 40, and the other end is connected to the extraction device 302. The extraction device includes an extraction chamber for holding coffee powder and completing the extraction process.

[0049] The coffee machine features both hot and cold brew modes. In hot brew mode, the pressurized instant heating element is powered on to heat the flowing cold water; in cold brew mode, the pressurized instant heating element is de-energized to allow cold water to pass through. In hot brew mode, the heated hot water enters the extraction device through the extraction tube, comes into contact with the coffee grounds, and completes the hot brew extraction; in cold brew mode, cold water enters the extraction device through the extraction tube, comes into contact with the coffee grounds, and completes the cold brew extraction.

[0050] In existing coffee machine water circuit layouts, the cold brew water circuit typically involves additional piping, which can lead to a large internal space requirement and hinder overall miniaturization design. This embodiment optimizes the connection layout of the pressurized instant heating component, ensuring that water flows through a single component in both cold and hot brew modes, thus reducing the number of piping lines. For example, the pressurized instant heating component is a pressurized structure that may include a built-in heating element and temperature sensor. It can withstand a certain water flow pressure and has a fast heating response, quickly heating the flowing cold water to the temperature required for hot brew.

[0051] Optionally, in some embodiments, the cold water circuit further includes a buffer noise reduction device, which is disposed on the cold water pipe and located downstream of the extraction pump. Because the extraction pump operates with high water flow velocity and high pressure, the water flow impacting the pipeline easily generates noise. Exemplarily, the buffer noise reduction device in this embodiment is provided with a buffer chamber, an elastic damping tube, or a sound-absorbing structure to buffer, reduce pressure, or absorb the water flow delivered by the extraction pump, thereby reducing the noise generated by the water flow impact and improving the user experience.

[0052] In the embodiments of this invention, the pressurized instant heating component can share pipelines for both cold and hot brewing modes. In hot brewing mode, the pressurized instant heating component is powered on, and the heating element works to rapidly heat the cold water supplied from the cold water pipe. The heated hot water is then transported to the extraction device via the extraction pipe to complete the hot brewing process. In cold brewing mode, the pressurized instant heating component is de-powered, the heating element does not work, and cold water flows directly through the inside of the pressurized instant heating component. There is no need to set up additional cold brewing pipelines, which greatly reduces the number of pipelines, simplifies the internal pipeline layout, makes the internal structure of the coffee machine more compact, reduces the complexity of pipeline connections, and improves the overall operational stability of the coffee machine.

[0053] Please see Figure 7 , Figure 7 This is a schematic diagram of the flow path of another coffee machine provided in an embodiment of the present invention. In one embodiment, the coffee machine further includes: a raw water tank 50, a purified water supply path 60, and a refrigeration module 70. The refrigeration module 70 has a chilled water mode for producing cold water, and the produced cold water can flow into the cold water chamber. The purified water supply path 60 has an inlet end connected to the raw water tank and an outlet end connected to the refrigeration module, and is used to filter the raw water to form purified water and supply it to the refrigeration unit to meet the water requirements for cold brewing and hot brewing.

[0054] Please see Figure 8 , Figure 8This is a schematic diagram of the flow path of another coffee machine provided in an embodiment of the present invention. In one embodiment, the coffee machine further includes an ice storage cavity 102; the refrigeration module 70 also has an ice-making mode for making ice cubes, and the made ice cubes can fall into the ice storage cavity 102. Ice cubes made in the ice-making mode can fall into the ice storage cavity 102 for storage, and cold water made in the cooling water mode can flow into the cold water cavity 101, and the cold water cavity 101 is connected to the cold water pipe 201. Exemplarily, the refrigeration module can be an evaporator. Correspondingly, the coffee machine also includes a compressor, a condenser, and a refrigerant pipe. The compressor, condenser, and evaporator form a heat exchange circuit through the refrigerant pipe, and an ice grid is formed on the evaporator. In ice-making mode, the compressor starts, and the refrigerant circulates between the condenser and evaporator through refrigerant pipes. The evaporator absorbs heat, causing heat exchange with the water flowing through the ice grid, which condenses into ice blocks. After the ice blocks are formed, they fall off and into the ice storage chamber below. In chilled water mode, the evaporator cools the water, keeping the water in the chilled water chamber at a low temperature. No additional refrigeration components are needed, integrating ice-making and chilled water functions, thus simplifying the structure and reducing energy consumption. Optionally, the ice storage chamber is located above the chilled water chamber. Through this layered arrangement, the ice storage and chilled water storage are independent yet interconnected. Melted ice blocks can flow directly into the chilled water chamber to replenish the chilled water, improving water resource utilization while ensuring that the chilled water in the chilled water chamber remains at a low temperature.

[0055] based on Figures 1-2 The structural diagram is shown below. The pressure control device provided in the embodiments of this application will be described in detail below with reference to Figure 9. It should be noted that... Figure 9 The pressure control device 9 in the middle is used to perform the functions described in this application. Figures 1-8 The methods shown in the embodiments are for illustrative purposes only, illustrating the parts relevant to the embodiments of this application. For specific technical details not disclosed, please refer to this application. Figures 1-8 The illustrated embodiment. Specifically, the pressure control device 9 includes: The outlet pressure determination unit 91 is used to obtain the outlet flow rate of the extraction pump detected by the flow meter, and determine the outlet pressure of the extraction pump based on the outlet flow rate. The difference calculation unit 92 is used to determine the difference between the effluent pressure and the target extraction pressure to obtain the pressure difference; The power determination unit 93 is used to determine the output power of the extraction pump based on the pressure difference. The operating control unit 94 is used to control the operation of the extraction pump according to the output power, so as to adjust the extraction pump to the target extraction pressure.

[0056] Optionally, the power determination unit 93 is specifically used for: Obtain the minimum regulating pressure value of the extraction pump; If the pressure difference is greater than the minimum regulating pressure value, then the step of determining the output power of the extraction pump based on the pressure difference is performed.

[0057] Optionally, the power determination unit 93 is further configured to: The output power is compared with the set maximum value and minimum value of a single change, respectively; If the output power is less than the minimum value of a single change, then the minimum value of a single change is updated as the output power; If the output power is greater than the maximum value of a single change, then the maximum value of a single change is updated as the output power.

[0058] Optionally, the outlet pressure determining unit 91 is specifically used for: At preset time intervals, the flow rate of the extraction pump detected by the flow meter is obtained, and the flow pressure of the extraction pump is determined based on the flow rate.

[0059] Optionally, the outlet pressure determining unit 91 is further configured to: Get the coffee type selected by the user; The target extraction pressure is determined based on the coffee type.

[0060] Optionally, the coffee machine further includes: The pressurized instant heating component has its inlet end connected to the cold water pipe; and The extraction module includes an extraction tube and an extraction device. One end of the extraction tube is connected to the water outlet of the pressurized instant heating component, and the other end is connected to the extraction device. The coffee machine has a hot brew mode and a cold brew mode. In the hot brew mode, the pressurized instant heating component is powered on to heat the flowing cold water; in the cold brew mode, the pressurized instant heating component is de-powered to allow cold water to pass through.

[0061] Optionally, the coffee machine further includes: Raw water tank; The refrigeration module has a refrigeration water mode for producing cold water, and the produced cold water can flow into the cold water chamber. A pure water supply circuit is provided, with the inlet end connected to the raw water tank and the outlet end connected to the refrigeration module, for supplying pure water to the refrigeration module.

[0062] Optionally, the coffee machine also includes an ice storage cavity; The refrigeration module also has an ice-making mode for making ice cubes, and the made ice cubes can fall into the ice storage cavity.

[0063] This invention application also provides a storage medium storing a computer program, which, when executed by a processor, implements the above-described functionality. Figures 1-8 The method described in the illustrated embodiment can be found in the following document for a detailed execution process. Figures 1-8 The specific details of the illustrated embodiments will not be elaborated here.

[0064] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0065] The above-disclosed embodiments are merely preferred embodiments of this specification and should not be construed as limiting the scope of this specification. Therefore, any equivalent variations made in accordance with the claims of this specification shall still fall within the scope of this specification.

Claims

1. A pressure control method, characterized in that, This invention is applied to a coffee machine, which includes a cold water tank, a cold water circuit, and an extraction module. The cold water tank has a cold water chamber for storing cold water. The cold water circuit includes a cold water pipe and a cold water pump, an extraction pump, and a flow meter arranged sequentially along the water flow direction on the cold water pipe. The inlet end of the cold water pipe is connected to the cold water chamber, and the outlet end of the extraction pump is connected to the extraction module. The flow meter is used to detect the water flow rate of the extraction pump. The method includes: The flow rate of the extraction pump detected by the flow meter is obtained, and the outlet pressure of the extraction pump is determined based on the flow rate. The pressure difference is obtained by determining the difference between the effluent pressure and the target extraction pressure; The output power of the extraction pump is determined based on the pressure difference. The extraction pump is controlled according to the output power to adjust it to the target extraction pressure.

2. The method as described in claim 1, characterized in that, Determining the output power of the extraction pump based on the pressure difference includes: Obtain the minimum regulating pressure value of the extraction pump; If the pressure difference is greater than the minimum regulating pressure value, then the step of determining the output power of the extraction pump based on the pressure difference is performed.

3. The method as described in claim 1, characterized in that, After determining the output power of the extraction pump based on the pressure difference, the method further includes: The output power is compared with the set maximum value and minimum value of a single change, respectively; If the output power is less than the minimum value of a single change, then the minimum value of a single change is updated as the output power; If the output power is greater than the maximum value of a single change, then the maximum value of a single change is updated as the output power.

4. The method as described in claim 1, characterized in that, The step of obtaining the outlet water flow rate of the extraction pump detected by the flow meter and determining the outlet water pressure of the extraction pump based on the outlet water flow rate includes: At preset time intervals, the flow rate of the extraction pump detected by the flow meter is obtained, and the flow pressure of the extraction pump is determined based on the flow rate.

5. The method as described in claim 1, characterized in that, Before determining the difference between the effluent pressure and the target extraction pressure to obtain the pressure difference, the method further includes: Get the coffee type selected by the user; The target extraction pressure is determined based on the coffee type.

6. The method as described in claim 1, characterized in that, The coffee machine also includes: The pressurized instant heating component has its inlet end connected to the cold water pipe; and The extraction module includes an extraction tube and an extraction device. One end of the extraction tube is connected to the water outlet of the pressurized instant heating component, and the other end is connected to the extraction device. The coffee machine has a hot brew mode and a cold brew mode. In the hot brew mode, the pressurized instant heating component is powered on to heat the flowing cold water; in the cold brew mode, the pressurized instant heating component is de-powered to allow cold water to pass through.

7. The method as described in claim 1, characterized in that, The coffee machine also includes: Raw water tank; The refrigeration module has a refrigeration water mode for producing cold water, and the produced cold water can flow into the cold water chamber. A pure water supply circuit is provided, with the inlet end connected to the raw water tank and the outlet end connected to the refrigeration module, for supplying pure water to the refrigeration module.

8. The method as described in claim 7, characterized in that, The coffee machine also includes an ice storage chamber; The refrigeration module also has an ice-making mode for making ice cubes, and the made ice cubes can fall into the ice storage cavity.

9. A pressure control device, characterized in that, include: The outlet pressure determination unit is used to acquire the outlet flow rate of the extraction pump detected by the flow meter, and determine the outlet pressure of the extraction pump based on the outlet flow rate. The difference calculation unit is used to determine the difference between the effluent pressure and the target extraction pressure to obtain the pressure difference; A power determination unit is used to determine the output power of the extraction pump based on the pressure difference. The operating control unit is used to control the operation of the extraction pump according to the output power, so as to adjust the extraction pump to the target extraction pressure.

10. A storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 5.

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