Coffee bean storage system and coffee machine

Abstract

This invention provides a coffee bean hopper preservation system and a coffee machine, belonging to the field of coffee machine technology. It includes a bean hopper, a nitrogen separation mechanism, and a controller, all mounted on the coffee machine body. The nitrogen separation mechanism is connected to the bean hopper via a nitrogen pipe and is used to separate nitrogen from the air and discharge the separated nitrogen into the bean hopper. A nitrogen concentration sensor is installed inside the bean hopper to detect the nitrogen concentration and feeds the detected value back to the controller. The controller controls the start and stop of the nitrogen separation mechanism based on the detected nitrogen concentration value. The coffee bean hopper preservation system and coffee machine provided by this invention can establish an anaerobic environment with a stable nitrogen concentration inside the bean hopper, thereby meeting the preservation and freshness requirements of freshly ground coffee machines, improving the quality of freshly ground coffee, and thus enhancing market acceptance.

Description

Technical Field

[0001] This utility model belongs to the field of coffee machine technology, specifically relating to a coffee bean storage preservation system and a coffee machine. Background Technology

[0002] More and more public places are now equipped with freshly ground coffee machines. The top of the coffee machine has an openable coffee bean hopper. Simply add coffee beans to the hopper regularly to ensure the fully automatic operation of the coffee machine. However, coffee beans will deteriorate if they are exposed to moisture and oxygen in the air for a long time, thus affecting the quality of the freshly ground coffee.

[0003] Current technology typically uses vacuum extraction to remove air from the coffee bean hopper, maintaining an oxygen-free and dry environment to slow down the rate at which the coffee beans spoil. However, roasted coffee beans naturally release carbon dioxide, a process that is most active within days to weeks after roasting. In a vacuum environment, the negative pressure accelerates this release, leading to flavor changes. Furthermore, the frequent vacuuming process—requiring the hopper to release beans after each grinding and then re-vacuuming them—further exacerbates flavor loss. In short, existing coffee bean hoppers only preserve the quality of the beans but cannot meet the requirements for freshness, thus requiring improvement. Utility Model Content

[0004] This utility model provides a coffee bean storage preservation system and a coffee machine, which aims to improve the preservation performance of freshly ground coffee machines for storing coffee beans.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: Firstly, a coffee bean hopper preservation system is provided, including a bean hopper, a nitrogen separation mechanism, and a controller installed on the coffee machine body; the nitrogen separation mechanism is connected to the bean hopper via a nitrogen pipe, and is used to separate nitrogen from the air and discharge the separated nitrogen into the bean hopper; a nitrogen concentration sensor is installed inside the bean hopper, which is used to detect the nitrogen concentration inside the bean hopper and feed back the nitrogen concentration detection value to the controller, and the controller controls the start and stop of the nitrogen separation mechanism based on the nitrogen concentration detection value.

[0006] In conjunction with the first aspect, in one possible implementation, a speed control valve is provided on the nitrogen pipe, and the speed control valve is electrically connected to the controller; the controller adjusts the opening degree of the speed control valve based on the nitrogen concentration detection value.

[0007] In some embodiments, the nitrogen separation mechanism includes a pressure assembly and two adsors connected in parallel between the pressure assembly and the bean hopper; wherein the pressure assembly is used to alternately pressurize air into the two adsors; the adsors form a high-pressure adsorption state when air is introduced and a depressurization desorption state when air intake stops; wherein the adsors are used to adsorb other gases besides nitrogen in the air in the high-pressure adsorption state and discharge unadsorbed nitrogen into the bean hopper, and the adsors are also used to discharge the adsorbed gases in the depressurization desorption state.

[0008] For example, both adsorbers have a three-way valve assembly at their inlet and a flow-limiting valve at their outlet; both three-way valve assemblies have an inlet passage and a waste discharge passage; both three-way valve assemblies are electrically connected to a controller, which controls the alternating switching between the inlet passage and waste discharge passage states; wherein, The flow restrictor valve is used to create a high-pressure environment inside the adsorber in the air intake path state so that the adsorber can form a high-pressure adsorption state; the three-way valve group is used to block the compressor assembly and adsorber in the exhaust path state and connect the air intake end of the adsorber to the outside.

[0009] For example, the air inlet ends of both adsorbers are connected to the air compressor assembly through air inlet pipes; an air inlet solenoid valve is provided on the air inlet pipe, and a waste discharge pipe is connected to the part of the air inlet pipe between the air inlet solenoid valve and the adsorber, and a waste discharge solenoid valve is provided on the waste discharge pipe. The intake solenoid valve and the exhaust solenoid valve together form a three-way valve group; when the intake solenoid valve is open and the exhaust solenoid valve is closed, an intake passage is formed; when the intake solenoid valve is closed and the exhaust solenoid valve is open, an exhaust passage is formed.

[0010] In one possible implementation, the air compressor assembly includes an air compressor and a cooler; the cooler is connected to the air compressor to cool the high-pressure air output by the air compressor, and the cooler is connected to a nitrogen separation mechanism to discharge cooled high-pressure air into the nitrogen separation mechanism.

[0011] In some embodiments, the air compressor has a filter at the air inlet.

[0012] For example, the nitrogen separation mechanism also includes a housing with an air inlet and an air outlet. The air inlet is aligned with the air inlet of the air compressor, and the air outlet corresponds to the position of the cooler.

[0013] In some embodiments, the coffee bean storage system also includes a power supply, which is electrically connected to the controller and the nitrogen separation mechanism, and the power supply is equipped with an external socket.

[0014] The beneficial effects of the coffee bean storage preservation system provided by this utility model are as follows: Compared with the prior art, the coffee bean storage preservation system of this utility model utilizes a nitrogen separation mechanism to draw in outside air, separate nitrogen gas, and discharge it into the bean storage. A nitrogen concentration sensor installed inside the bean storage detects the nitrogen concentration in real time and feeds it back to the controller. The controller controls the start and stop of the nitrogen separation mechanism based on the nitrogen concentration detection value. Specifically, when the nitrogen concentration detection value is lower than the set value, the nitrogen separation mechanism starts working and discharges nitrogen gas into the bean storage. When the nitrogen concentration detection value reaches the set value, the nitrogen separation mechanism stops to reduce energy consumption. This can establish a normal pressure anaerobic environment with a stable nitrogen concentration in the bean storage. This not only isolates the coffee beans in the bean storage from oxygen and extends their shelf life, but also allows the coffee beans in the bean storage to maintain a state of naturally releasing carbon dioxide, avoiding the accelerated loss of carbon dioxide from the coffee beans and causing flavor changes. This meets the preservation and freshness requirements of freshly ground coffee machines for coffee bean storage, improves the quality of freshly ground coffee, and thus enhances market acceptance.

[0015] Secondly, this utility model embodiment also provides a coffee machine, including the aforementioned coffee bean storage insurance system.

[0016] The beneficial effects of the coffee machine provided by this utility model are as follows: Compared with the prior art, the coffee machine of this utility model adopts the above-mentioned coffee bean hopper preservation system, which can establish an atmospheric pressure anaerobic environment with a stable nitrogen concentration in the bean hopper. This not only isolates the coffee beans in the bean hopper from oxygen and extends their shelf life, but also allows the coffee beans in the bean hopper to maintain a state of naturally releasing carbon dioxide, avoiding the accelerated loss of carbon dioxide in the coffee beans and causing flavor changes. This meets the preservation and freshness requirements of freshly ground coffee machines for coffee bean storage, improves the quality of freshly ground coffee, and thus enhances market acceptance. Attached Figure Description

[0017] Figure 1 A block diagram illustrating the airflow principle of the coffee bean storage preservation system provided in this embodiment of the present invention; Figure 2 A three-dimensional structural diagram of the coffee bean storage preservation system (excluding the bean storage compartment) provided in an embodiment of this utility model; Figure 3 This is a three-dimensional structural diagram of the nitrogen separation mechanism used in the embodiments of this utility model; Figure 4 A schematic diagram of the overall structure of the coffee bean storage preservation system provided in this embodiment of the present invention.

[0018] In the diagram: 10. Bean hopper; 11. Nitrogen pipe; 12. Speed ​​control valve; 20. Nitrogen separation mechanism; 21. Compressor assembly; 211. Air compressor; 212. Cooler; 213. Filter; 22. Adsorber; 221. Three-way valve assembly; 222. Flow restrictor; 223. Inlet pipe; 224. Inlet solenoid valve; 225. Waste discharge pipe; 226. Waste discharge solenoid valve; 23. Housing; 231. Air inlet; 232. Air outlet; 30. Controller; 40. Power supply; 41. External connector. Detailed Implementation

[0019] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] It should be understood that during the roasting process of coffee beans (green beans), the water inside the cells begins to evaporate. As the beans absorb heat, carbon dioxide is continuously generated, and the cell walls gradually harden and expand. As the roasting process continues, the internal pressure of the coffee bean increases, and coffee oils are drawn into the tiny pores of the cell walls, creating a sealing effect that traps carbon dioxide and other aromatic substances – this is the source of the coffee aroma. After roasting, the carbon dioxide inside the coffee bean is naturally released. This natural release process is commonly known as degassing. The bubbles that appear during the brewing of fresh coffee beans are due to the effect of carbon dioxide. If carbon dioxide is released too quickly, the coffee bean's flavor will be lost. Even if the coffee bean hasn't spoiled, it will lose its original fresh and characteristic taste.

[0021] In existing technology, the working mode of a freshly ground coffee machine involves staff periodically replenishing the coffee bean hopper with roasted coffee beans, followed by a vacuum pump installed on the machine to evacuate the hopper. When freshly ground coffee is being made (for example, when a customer orders freshly ground coffee at a vending machine), a valve at the bottom of the coffee bean hopper opens, discharging a measured amount of coffee beans into the grinding mechanism. This process deprives the coffee bean hopper of its vacuum environment, requiring the vacuum pump to re-vacuum the hopper after each dispensing of coffee beans. This repeated vacuuming undoubtedly accelerates the release of carbon dioxide from the coffee beans, causing them to lose their fresh taste within a short period.

[0022] Please refer to the following: Figures 1 to 4The coffee bean hopper 10 preservation system provided by this utility model will now be described. The coffee bean hopper 10 preservation system includes a bean hopper 10, a nitrogen separation mechanism 20, and a controller 30, all mounted on the coffee machine body. The nitrogen separation mechanism 20 is connected to the bean hopper 10 via a nitrogen pipe 11 and is used to separate nitrogen from the air and discharge the separated nitrogen into the bean hopper 10. A nitrogen concentration sensor (not shown in the figure) is installed inside the bean hopper 10. The nitrogen concentration sensor is used to detect the nitrogen concentration inside the bean hopper 10 and feeds back the nitrogen concentration detection value to the controller 30. The controller 30 controls the start and stop of the nitrogen separation mechanism 20 based on the nitrogen concentration detection value.

[0023] It should be noted that the nitrogen separation unit 20 can specifically use membrane separation nitrogen generation technology or pressure swing adsorption nitrogen generation technology to generate nitrogen. Here, pressure swing adsorption nitrogen generation technology is preferred. It uses air as the gas source and uses the different adsorption rates of nitrogen and other gas components (mainly oxygen) under different pressures of molecular sieves to separate nitrogen. The purity of the generated nitrogen can reach more than 99%.

[0024] Of course, it is also feasible to integrate a nitrogen tank into the coffee maker to release nitrogen into the bean hopper 10. However, considering the continuous demand for nitrogen in the bean hopper 10, this solution requires frequent replacement of the nitrogen tank to ensure a continuous supply of nitrogen. If the nitrogen tank is not replaced in time, the coffee beans will lose the nitrogen protection environment. Therefore, this method was not adopted in this embodiment. However, this solution can also be used as a variation of this embodiment, and it is not limited here.

[0025] Nitrogen concentration sensors can be sensors that detect nitrogen concentration in the environment based on electrochemical principles, semiconductor principles, or oxygen measurement principles. They are existing technology devices and will not be described in detail here.

[0026] It should be noted that, in order to ensure that the soybean bin 10 always maintains a stable atmospheric pressure environment, a one-way exhaust valve can be installed on the top of the soybean bin 10. The nitrogen separation mechanism 20 discharges nitrogen into the soybean bin 10 from the bottom of the soybean bin 10. The air in the soybean bin 10 is discharged from the soybean bin 10 through the one-way exhaust valve under the compression of the nitrogen until the nitrogen concentration in the soybean bin 10 reaches the required level.

[0027] The coffee bean hopper 10 preservation system provided in this embodiment, compared with the prior art, utilizes a nitrogen separation mechanism 20 to draw in outside air, separate nitrogen gas, and discharge it into the bean hopper 10. A nitrogen concentration sensor installed inside the bean hopper 10 detects the nitrogen concentration in real time and feeds it back to the controller 30. The controller 30 controls the start and stop of the nitrogen separation mechanism 20 based on the nitrogen concentration detection value. Specifically, when the nitrogen concentration detection value is lower than the set value, the nitrogen separation mechanism 20 starts working and discharges nitrogen gas into the bean hopper 10. When the nitrogen concentration detection value reaches the set value, the nitrogen separation mechanism 20 stops to reduce energy consumption. This can establish a normal pressure anaerobic environment with a stable nitrogen concentration in the bean hopper 10. This not only isolates the coffee beans in the bean hopper 10 from oxygen and extends their shelf life, but also allows the coffee beans in the bean hopper 10 to maintain a state of naturally releasing carbon dioxide, avoiding the accelerated loss of carbon dioxide from the coffee beans and causing flavor changes. This meets the preservation and freshness requirements of freshly ground coffee machines for coffee bean storage, improves the quality of freshly ground coffee, and thus enhances market acceptance.

[0028] In some embodiments, see Figure 1 and Figure 3 A speed control valve 12 is provided on the nitrogen pipe 11, and the speed control valve 12 is electrically connected to the controller 30; the controller 30 adjusts the opening degree of the speed control valve 12 based on the nitrogen concentration detection value.

[0029] Under normal circumstances, the nitrogen concentration in the bean hopper 10 is stable. However, considering the possibility of nitrogen slowly leaking out of the hopper, the opening of the speed control valve 12 can be reduced to slowly replenish nitrogen into the hopper 10. When coffee beans are discharged from the hopper 10 to the grinding mechanism, the nitrogen in the hopper 10 will be discharged along with the coffee beans, causing the nitrogen concentration in the hopper 10 to decrease rapidly. At this time, the opening of the speed control valve 12 should be increased to accelerate the rate at which nitrogen is discharged into the hopper 10, thereby preventing the coffee beans from coming into contact with oxygen. By setting the speed control valve 12 in conjunction with the nitrogen concentration detection value, not only can nitrogen waste be avoided, but the stability of the nitrogen concentration in the bean hopper 10 can also be improved, thereby enhancing the preservation effect of the coffee bean hopper 10 on the coffee beans.

[0030] As one specific embodiment of the nitrogen separation mechanism 20 described above, please refer to... Figure 1 and Figure 3The nitrogen separation mechanism 20 includes a compressor assembly 21 and two adsors 22 connected in parallel between the compressor assembly 21 and the bean hopper 10. The compressor assembly 21 is used to alternately pressurize air into the two adsors 22. The adsors 22 form a high-pressure adsorption state when air is introduced and a depressurization desorption state when air intake stops. The adsors 22 are used to adsorb other gases besides nitrogen in the air in the high-pressure adsorption state and discharge the unadsorbed nitrogen into the bean hopper 10. The adsors 22 are also used to discharge the adsorbed gas in the depressurization desorption state.

[0031] Considering that air is mainly composed of oxygen and nitrogen, and contains less than one percent of rare gases, the adsorber 22 that selectively adsorbs oxygen can be used without considering rare gases. Alternatively, an adsorber 22 with multiple adsorption materials that can selectively adsorb oxygen and rare gases in the air can be selected to improve the purity of nitrogen separation. No limitation is made here.

[0032] The function of the air compressor 21 is to convert atmospheric pressure air into high pressure air and alternately discharge it into the two adsorbers 22. Here, the two adsorbers 22 are defined as adsorber A and adsorber B, respectively. Figure 1 As shown, the specific working process is as follows: after high-pressure air enters the adsorber A, other gases besides nitrogen are adsorbed, while nitrogen is not adsorbed and is discharged into the bean hopper 10. When the adsorber A reaches the saturated adsorption state, the pressure component 21 starts to discharge high-pressure air into the adsorber B for nitrogen separation. At this time, the adsorber A gradually depressurizes and desorbs the previously adsorbed gas and discharges it. When the adsorber B reaches the saturated adsorption state, the pressure component 21 discharges high-pressure air into the adsorber A again. This process is repeated to achieve continuous nitrogen output and ensure the continuity of nitrogen supply.

[0033] For some possible implementations, please refer to [link / reference]. Figure 1 and Figure 3 Both adsorbers 22 are equipped with a three-way valve group 221 at their inlet end and a flow limiting valve 222 at their outlet end. Both three-way valve groups 221 have an inlet passage state and a waste discharge passage state. Both three-way valve groups 221 are electrically connected to the controller 30, which controls the two three-way valve groups 221 to switch alternately between the inlet passage state and the waste discharge passage state.

[0034] The flow restrictor valve 222 is used to create a high-pressure environment inside the adsorber 22 in the air intake passage state so that the adsorber 22 forms a high-pressure adsorption state; the three-way valve group 221 is used to block the compressor assembly 21 and the adsorber 22 in the waste discharge passage state and connect the air intake end of the adsorber 22 to the outside.

[0035] The function of the flow limiting valve 222 is to control the speed at which nitrogen is discharged from the adsorber 22. Since the flow rate of nitrogen discharged from the adsorber 22 through the flow limiting valve 222 is small, while the flow rate of the gas compression assembly 21 discharged into the adsorber 22 through the three-way valve group 221 is large, a high pressure can be formed inside the adsorber 22, thereby satisfying the adsorption conditions of the adsorber 22 for gases other than nitrogen. When the adsorber 22 reaches the saturated adsorption state, the three-way valve group 221 switches to the waste discharge passage state. At this time, the adsorber 22 can be depressurized through the three-way valve group 221, thereby venting the adsorbed gas to the external environment. This enables the two adsorbers 22 to work alternately in adsorption-desorption, thereby achieving continuous nitrogen output.

[0036] Specifically, see Figure 1 and Figure 3 In this embodiment, the air inlet ends of both adsorbers 22 are connected to the air compressor assembly 21 through air inlet pipes 223; an air inlet solenoid valve 224 is provided on the air inlet pipe 223, and a waste discharge pipe 225 is connected to the part of the air inlet pipe 223 between the air inlet solenoid valve 224 and the adsorber 22, and a waste discharge solenoid valve 226 is provided on the waste discharge pipe 225; the air inlet solenoid valve 224 and the waste discharge solenoid valve 226 together form a three-way valve group 221; wherein, when the air inlet solenoid valve 224 is open and the waste discharge solenoid valve 226 is closed, an air inlet passage is formed; when the air inlet solenoid valve 224 is closed and the waste discharge solenoid valve 226 is open, a waste discharge passage is formed.

[0037] For easier understanding, please refer to Figure 1 Here, the intake solenoid valve 224 connected to the above-mentioned adsorber A is defined as solenoid valve A1, the waste discharge solenoid valve connected to the above-mentioned adsorber A is defined as solenoid valve B2, and the flow limiting valve connected to the above-mentioned adsorber A is defined as flow limiting valve A; the intake solenoid valve connected to the above-mentioned adsorber B is defined as solenoid valve A2, the waste discharge solenoid valve connected to the above-mentioned adsorber B is defined as solenoid valve B1, and the flow limiting valve connected to the above-mentioned adsorber B is defined as flow limiting valve B.

[0038] When solenoid valves A1 and B1 are open and solenoid valves A2 and B2 are closed, the air compression assembly 21 discharges high-pressure air into the adsorber A. The adsorber A adsorbs gases other than nitrogen from the high-pressure air, while the nitrogen is discharged through the flow-limiting valve A and enters the bean hopper 10. When the adsorber A reaches or approaches saturation, solenoid valves A1 and B1 close, while solenoid valves A2 and B2 open. At this time, high-pressure air begins to enter the adsorber B, which adsorbs gases other than nitrogen from the high-pressure air. The nitrogen gas is discharged through the flow limiting valve B. Most of the discharged nitrogen enters the soybean hopper 10 (the amount entering the soybean hopper 10 can be determined by the opening of the speed regulating valve 12), while a small portion enters the adsorber A through the flow limiting valve A, thereby driving the gas desorbed by the adsorber A to be discharged through the solenoid valve B2. When the adsorber B reaches or is close to saturation adsorption, it switches back to the state where solenoid valves A1 and B1 are open and solenoid valves A2 and B2 are closed, and the adsorber A starts working again. This process is repeated to achieve the alternating operation of the two adsorbers 22, ensuring the continuity of nitrogen supply.

[0039] As an optional embodiment of the aforementioned air compressor assembly 21, please refer to Figure 1 and Figure 3 The air compressor assembly 21 includes an air compressor 211 and a cooler 212; the cooler 212 is connected to the air compressor 211 to cool the high-pressure air output by the air compressor 211, and the cooler 212 is connected to the nitrogen separation mechanism 20 to discharge cooled high-pressure air into the nitrogen separation mechanism 20.

[0040] The air compressor 211 can be a piston, screw, turbine, slide gate, or any other type of air compressor. A screw air compressor is preferred due to its smooth operation and low noise. The cooler 212 can be air-cooled or water-cooled, with air-cooling being preferred. Since the air compression process involves a temperature increase, the cooler 212 is installed to cool the compressed high-pressure air, preventing excessively high nitrogen temperatures from damaging the coffee beans before they enter the bean hopper 10.

[0041] It should be noted that, as Figure 3 As shown, the air compressor 211 is equipped with a filter 213 at its air inlet. The function of the filter 213 is to remove dust from the air, thereby obtaining clean air to enter the air compressor 211. At the same time, the air compressor 211 dries the air due to the temperature increase during the air compression process. Therefore, the air that finally enters the adsorber 22 after passing through the cooler 212 is clean, dry, and high-pressure air. This can improve the cleanliness and dryness of the nitrogen entering the bean hopper 10, which is beneficial to improving the preservation effect of nitrogen on coffee beans.

[0042] Optionally, such as Figure 4As shown, in this embodiment, the nitrogen separation mechanism 20 also includes a housing 23. The housing 23 is provided with an air inlet 231 and an air outlet 232. The air inlet 231 is aligned with the air inlet end of the air compressor 211, and the air outlet 232 corresponds to the position of the cooler 212. The modular design formed by the housing 23 facilitates installation and layout within the coffee machine body, avoiding affecting the neatness of the coffee machine body's appearance. Furthermore, considering the air intake requirements of the air compressor 211 and the heat dissipation requirements of the cooler 212, the air inlet 231 and air outlet 232 are provided to ensure smooth airflow within the housing 23.

[0043] In some embodiments, such as Figure 2 As shown, the coffee bean hopper 10 preservation system also includes a power supply 40, which is electrically connected to the controller 30 and the nitrogen separation mechanism 20. The power supply 40 is equipped with an external connector 41. This power supply 40 can be used as a backup power source, such as a battery. Under normal circumstances, it is powered through the external connector 41. In the event of a power outage, the power supply 40 maintains the operation of the nitrogen separation mechanism 20, ensuring that the bean hopper 10 can continuously obtain nitrogen, thereby improving the preservation performance of the coffee beans.

[0044] Based on the same inventive concept, combined with Figures 1 to 4 It is understood that this application embodiment also provides a coffee machine, including the above-mentioned coffee bean hopper 10 preservation system.

[0045] Compared with the prior art, the coffee machine provided in this embodiment adopts the above-mentioned coffee bean hopper 10 preservation system, which can establish an atmospheric pressure anaerobic environment with a stable nitrogen concentration in the bean hopper 10. This not only isolates the coffee beans in the bean hopper 10 from oxygen and extends their shelf life, but also keeps the coffee beans in the bean hopper 10 in a state of naturally releasing carbon dioxide, avoiding the accelerated loss of carbon dioxide in the coffee beans and causing flavor changes. This meets the preservation and freshness requirements of freshly ground coffee machines for coffee bean storage, improves the quality of freshly ground coffee, and thus enhances market acceptance.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A coffee bean storage preservation system, characterized in that, The coffee machine includes a bean hopper, a nitrogen separation mechanism, and a controller, all mounted on the machine body. The nitrogen separation mechanism is connected to the bean hopper via a nitrogen pipe and is used to separate nitrogen from the air and discharge the separated nitrogen into the bean hopper. The soybean hopper is equipped with a nitrogen concentration sensor, which is used to detect the nitrogen concentration in the soybean hopper and feed back the nitrogen concentration detection value to the controller. The controller controls the start and stop of the nitrogen separation mechanism based on the nitrogen concentration detection value.

2. The coffee bean storage preservation system as described in claim 1, characterized in that, The nitrogen pipe is equipped with a speed control valve, which is electrically connected to the controller; the controller adjusts the opening degree of the speed control valve based on the nitrogen concentration detection value.

3. The coffee bean storage preservation system as described in claim 1, characterized in that, The nitrogen separation mechanism includes a gas compressor assembly and two adsors, which are connected in parallel between the gas compressor assembly and the bean hopper; wherein, the gas compressor assembly is used to alternately pressurize air into the two adsors; The adsorber forms a high-pressure adsorption state when air is introduced and a depressurization and desorption state when air intake is stopped. The adsorber is used to adsorb gases other than nitrogen in the air in the high-pressure adsorption state and discharge the unadsorbed nitrogen into the bean hopper. The adsorber is also used to discharge the adsorbed gases in the depressurization and desorption state.

4. The coffee bean storage preservation system as described in claim 3, characterized in that, Both of the two adsorbers are equipped with a three-way valve assembly at their air inlet end and a flow-limiting valve at their air outlet end; both of the three-way valve assemblies have an air inlet passage and a waste discharge passage. Both of the three-way valve assemblies are electrically connected to the controller, which controls the two three-way valve assemblies to alternately switch between the intake passage state and the exhaust passage state; wherein, The flow-limiting valve is used to create a high-pressure environment inside the adsorber when the air intake passage is in the state of the adsorption passage, so that the adsorber forms the high-pressure adsorption state. The three-way valve assembly is used to block the air compressor and the adsorber when the waste discharge passage is in the state, and to connect the air inlet of the adsorber to the outside.

5. The coffee bean storage preservation system as described in claim 4, characterized in that, Both air inlets of the two adsorbers are connected to the air compression assembly via air inlet pipes; an air inlet solenoid valve is provided on the air inlet pipe, and a waste discharge pipe is connected to the part of the air inlet pipe between the air inlet solenoid valve and the adsorber, and a waste discharge solenoid valve is provided on the waste discharge pipe; The intake solenoid valve and the exhaust solenoid valve together form the three-way valve group; wherein, when the intake solenoid valve is open and the exhaust solenoid valve is closed, the intake passage state is formed; when the intake solenoid valve is closed and the exhaust solenoid valve is open, the exhaust passage state is formed.

6. The coffee bean storage preservation system as described in claim 3, characterized in that, The air compressor assembly includes an air compressor and a cooler; the cooler is connected to the air compressor to cool the high-pressure air output by the air compressor, and the cooler is connected to the nitrogen separation mechanism to discharge cooled high-pressure air into the nitrogen separation mechanism.

7. The coffee bean storage preservation system as described in claim 6, characterized in that, The air compressor is equipped with a filter at the air inlet.

8. The coffee bean storage preservation system as described in claim 6, characterized in that, The nitrogen separation mechanism also includes a housing, on which an air inlet and an air outlet are provided. The air inlet is aligned with the air inlet end of the air compressor, and the air outlet corresponds to the position of the cooler.

9. The coffee bean storage preservation system according to any one of claims 1-8, characterized in that, The coffee bean storage preservation system also includes a power supply, which is electrically connected to the controller and the nitrogen separation mechanism, and the power supply is equipped with an external socket.

10. A coffee machine, characterized in that, Including the coffee bean storage preservation system as described in any one of claims 1-9.

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