Refrigerator dynamic balance controlled atmosphere fresh-keeping system and method

Abstract

The invention provides a dynamic balance controlled atmosphere fresh-keeping system and method for a refrigerator, and the system comprises a box body which is internally provided with a dynamic controlled atmosphere chamber; the multi-dimensional sensing module and the gas management module are arranged in the dynamic air conditioning chamber; the multi-dimensional sensing module is configured to obtain door body opening and closing data of the box body; the controller is connected to the multi-dimensional sensing module and the gas management module, and the controller is configured to determine the air intrusion amount by using an air intrusion amount model based on the door body opening and closing data; and based on the air invasion amount, the gas management module is used for maintaining the oxygen concentration in the dynamic air-conditioning chamber within a set range, and the pressure difference between the interior of the dynamic air-conditioning chamber and the exterior of the refrigerator body is maintained within a set pressure difference range, so that the problem that according to an existing air-conditioning fresh-keeping method of the refrigerator, high vacuum in the refrigerator body is maintained or high-purity nitrogen is continuously filled into the refrigerator body, and the refrigerator body cannot be kept fresh is solved. And the refrigerator is complex in structure, high in cost and large in energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, in particular to a refrigerator dynamic balance modified atmosphere fresh-keeping system and method. BACKGROUND

[0002] In the field of household refrigerators, fresh-keeping performance has always been the core index of consumer attention and the focus of industry research and development. With the improvement of living quality, consumers have higher requirements for the freshness of food materials such as fruits and vegetables, and expect refrigerators to prolong the shelf life of food materials and reduce waste caused by deterioration. Studies have shown that reducing the oxygen concentration in the refrigeration environment from the atmospheric level of 21% to 18%-19% can effectively inhibit the respiration and oxidation of most fruits and vegetables, significantly prolong the shelf life, and the concentration range has little risk of anaerobic respiration for fruits and vegetables, and the preservation effect and energy consumption ratio achieve a relatively optimal balance.

[0003] To meet the above needs, various schemes are currently used to adjust the oxygen concentration in the refrigeration environment of the refrigerator. Most of them focus on creating a deep low-oxygen environment, one of which relies on high-vacuum technology to reduce the oxygen concentration by extracting air from the refrigeration space, and the other uses a continuous high-purity nitrogen charging method to replace the oxygen in the space. These schemes aim to reduce the oxygen concentration in the refrigeration environment to a very low level (<5%) in order to achieve better preservation effect.

[0004] However, the above technical solutions rely on high-vacuum equipment or continuous nitrogen charging devices, resulting in high cost and high energy consumption, and the sealing requirement of the refrigerator space is extremely harsh, which is difficult to adapt to the needs of frequent access to food materials in a household scenario. In order to maintain a low-oxygen environment, the system often forms a significant negative or positive pressure in the chamber, and the user needs to overcome a large pressure difference when opening the door, which feels heavy and is not convenient. Frequent opening and closing of the door during daily use will cause a large amount of external air to rush in, seriously disrupting the internal gas balance. SUMMARY

[0005] The present application provides a refrigerator dynamic balance modified atmosphere fresh-keeping system and method to solve the technical problem that the existing modified atmosphere fresh-keeping method of the refrigerator relies on maintaining high vacuum in the box or continuously charging high-purity nitrogen into the box, resulting in complex structure, high cost and high energy consumption of the refrigerator.

[0006] The first aspect of the present application provides a refrigerator dynamic balance modified atmosphere fresh-keeping system, comprising: a box body, wherein a dynamic modified atmosphere chamber is arranged in the box body; and a multi-dimensional sensing module and a gas management module arranged in the dynamic modified atmosphere chamber; the multi-dimensional sensing module is configured to: obtain door opening and closing data of the box body; the door opening and closing data includes the opening and closing state, the opening angle, the opening speed, the opening duration and the handle vibration frequency of the door. and a controller connected to the multi-dimensional sensing module and the gas management module, the controller being configured to: determine an air intrusion amount based on the door opening and closing data, using an air intrusion amount model trained using historical door opening and closing data and corresponding air intrusion amount data; maintain the oxygen concentration in the dynamic controlled atmosphere chamber within a set range and maintain the pressure difference between the dynamic controlled atmosphere chamber and the outside of the cabinet within a set pressure difference range based on the air intrusion amount, using the gas management module.

[0007] In some embodiments, the multi-dimensional sensing module comprises: a plurality of laser oxygen concentration sensors disposed in the return air duct of the dynamic controlled atmosphere chamber, the laser oxygen concentration sensors being configured to: obtain an oxygen concentration value in the dynamic controlled atmosphere chamber; a micro differential pressure sensor disposed in the dynamic controlled atmosphere chamber, the micro differential pressure sensor being configured to: obtain a pressure value in the dynamic controlled atmosphere chamber; a multi-dimensional door state sensor disposed inside the door handle of the cabinet, the multi-dimensional door state sensor being configured to: obtain door opening and closing data of the cabinet.

[0008] In some embodiments, the gas management module comprises: disposed in the module housing: a membrane nitrogen-oxygen separator, a nitrogen-rich gas outlet end of the membrane nitrogen-oxygen separator being connected to the dynamic controlled atmosphere chamber through an electromagnetic proportional valve and a Venturi ejector; the membrane nitrogen-oxygen separator being provided with an air inlet end and an oxygen-rich waste gas outlet end; the membrane nitrogen-oxygen separator being used to separate oxygen and nitrogen in air, the oxygen being discharged to the outside of the cabinet through the oxygen-rich waste gas outlet end, and the nitrogen being discharged to the dynamic controlled atmosphere chamber through the nitrogen-rich gas outlet end; a micro vacuum pump connected to the vacuum buffer tank, the micro vacuum pump being used to extract air in the dynamic controlled atmosphere chamber.

[0009] In some embodiments, the gas management module further comprises: a normal pressure balance electromagnetic valve connected to the dynamic controlled atmosphere chamber and the outside of the cabinet; the normal pressure balance electromagnetic valve being used to maintain the pressure difference between the dynamic controlled atmosphere chamber and the outside of the cabinet within a set pressure difference range.

[0010] In some embodiments, the controller is further configured to: When the door handle vibration frequency is greater than the preset frequency, the opening of the normal pressure balance electromagnetic valve is adjusted to the maximum, so that the pressure between the dynamic atmosphere interval room and the outside of the box is balanced.

[0011] In some embodiments, the controller is further configured to: If the air intrusion amount is less than the preset air intrusion amount, the electromagnetic proportional valve is opened, the membrane nitrogen oxygen separator is controlled to spray nitrogen-rich gas to the dynamic atmosphere interval room at a set flow rate until the oxygen concentration in the dynamic atmosphere interval room reaches a set range, and the opening of the electromagnetic proportional valve and the normal pressure balance electromagnetic valve is adjusted so that the oxygen concentration in the dynamic atmosphere interval room is maintained within the set range and the pressure difference between the dynamic atmosphere interval room and the outside of the box is maintained within a set pressure difference range.

[0012] In some embodiments, the controller is further configured to: If the air intrusion amount is greater than or equal to the preset air intrusion amount, the micro vacuum pump is opened according to a preset time, after the micro vacuum pump is closed, the electromagnetic proportional valve is opened, the membrane nitrogen oxygen separator is controlled to spray nitrogen-rich gas to the dynamic atmosphere interval room at a set flow rate until the oxygen concentration in the dynamic atmosphere interval room reaches a set range, and the opening of the electromagnetic proportional valve and the normal pressure balance electromagnetic valve is adjusted so that the oxygen concentration in the dynamic atmosphere interval room is maintained within the set range and the pressure difference between the dynamic atmosphere interval room and the outside of the box is maintained within a set pressure difference range.

[0013] In some embodiments, a uniform air plate is arranged on the top of the dynamic atmosphere interval room, the uniform air plates are oppositely arranged on both sides of the dynamic atmosphere interval room, the nitrogen gas is discharged through the nitrogen-rich gas outlet end and discharged to the dynamic atmosphere interval room through the uniform air plates; The controller is further configured to: If the air intrusion amount is less than the preset air intrusion amount and the number of openings of the door is one, the electromagnetic proportional valve is opened, the membrane nitrogen oxygen separator is controlled to spray nitrogen-rich gas to the uniform air plate corresponding to the side of the opened door at a set flow rate until the oxygen concentration in the dynamic atmosphere interval room reaches a set range, and the opening of the electromagnetic proportional valve and the normal pressure balance electromagnetic valve is adjusted so that the oxygen concentration in the dynamic atmosphere interval room is maintained within the set range and the pressure difference between the dynamic atmosphere interval room and the outside of the box is maintained within a set pressure difference range.

[0014] In some embodiments, a sealing door seal is arranged between the door and the box.

[0015] The second aspect of the application provides a refrigerator dynamic balance modified atmosphere preservation method, applied to the refrigerator dynamic balance modified atmosphere preservation system of any one of the first aspect, comprising: Obtaining door opening and closing data of the cabinet; the door opening and closing data includes: opening and closing state, opening angle, opening speed, opening duration and door handle vibration frequency of the door; Based on the door opening and closing data, the air intrusion amount is determined by using the air intrusion amount model; the air intrusion amount model is generated by training historical door opening and closing data and corresponding air intrusion amount data; If the air intrusion amount is less than the preset air intrusion amount, open the electromagnetic proportional valve, control the membrane method nitrogen oxygen separator to spray nitrogen-rich gas to the dynamic modified atmosphere chamber at a set flow rate until the oxygen concentration in the dynamic modified atmosphere chamber reaches the set range, adjust the opening degree of the electromagnetic proportional valve and the normal pressure balance electromagnetic valve, and maintain the oxygen concentration in the dynamic modified atmosphere chamber within the set range and the pressure difference between the dynamic modified atmosphere chamber and the cabinet outside within the set pressure difference range; If the air intrusion amount is greater than or equal to the preset air intrusion amount, open the micro vacuum pump according to the preset time, open the electromagnetic proportional valve after the micro vacuum pump is closed, control the membrane method nitrogen oxygen separator to spray nitrogen-rich gas to the dynamic modified atmosphere chamber at a set flow rate until the oxygen concentration in the dynamic modified atmosphere chamber reaches the set range, adjust the opening degree of the electromagnetic proportional valve and the normal pressure balance electromagnetic valve, and maintain the oxygen concentration in the dynamic modified atmosphere chamber within the set range and the pressure difference between the dynamic modified atmosphere chamber and the cabinet outside within the set pressure difference range.

[0016] The application provides a refrigerator dynamic balance modified atmosphere fresh-keeping system and method, the system comprising: a cabinet, a dynamic modified atmosphere chamber being arranged in the cabinet; and a multi-dimensional sensing module and a gas management module arranged in the dynamic modified atmosphere chamber; the multi-dimensional sensing module is configured to acquire door opening and closing data of the cabinet; the door opening and closing data comprises opening and closing state, opening angle, opening speed, opening duration and door handle vibration frequency of the door; and a controller connected to the multi-dimensional sensing module and the gas management module, the controller is configured to determine air intrusion amount by using an air intrusion amount model based on the door opening and closing data; the air intrusion amount model is generated by training historical door opening and closing data and corresponding air intrusion amount data; based on the air intrusion amount, the gas management module is used to maintain oxygen concentration in the dynamic modified atmosphere chamber within the set range and the pressure difference between the dynamic modified atmosphere chamber and the outside of the cabinet within the set pressure difference range, so as to accurately control the chamber working oxygen concentration in the best interval of 18-19%, while ensuring the fresh-keeping effect and significantly reducing energy consumption and risk; through the oxygen concentration recovery mechanism, frequent door opening and closing disturbance can be quickly responded to, and the problem of current oxygen concentration recovery lag is solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the application, the drawings needed in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 It is a structural schematic diagram of the gas management module in the application. Figure 2 It is a structural schematic diagram of the cabinet in the application. Figure 3 It is a flowchart of the dynamic balance modified atmosphere in the application.

[0019] BRIEF DESCRIPTION OF DRAWINGS: 1-cabinet; 11-door; 12-seal door seal; 2-dynamic modified atmosphere chamber; 3-multi-dimensional sensing module; 31-laser oxygen concentration sensor; 32-micro differential pressure sensor; 33-multi-dimensional door state sensor; 4-gas management module; 41-module shell; 42-film method nitrogen-oxygen separator; 421-nitrogen-rich gas outlet end; 422-air inlet end; 423-oxygen-rich waste gas outlet end; 43-electromagnetic proportional valve; 44-venturi ejector; 45-micro vacuum pump; 46-vacuum buffer tank; 47-normal pressure balance electromagnetic valve; 5-controller. DETAILED DESCRIPTION

[0020] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should fall within the scope of protection of the present application.

[0021] In some technologies, the modified atmosphere preservation method of the refrigerator relies on maintaining a high vacuum in the cabinet or continuously filling high-purity nitrogen into the cabinet, resulting in a complex structure, high cost, and high energy consumption of the refrigerator. In order to solve this technical problem, the present application provides a refrigerator dynamic balance modified atmosphere preservation system and method, which will be described below. The first aspect of the present application provides a refrigerator dynamic balance modified atmosphere preservation system, comprising: A cabinet 1, wherein a dynamic modified atmosphere chamber 2 is arranged in the cabinet 1, as shown in Figure 2 The oxygen concentration in the dynamic modified atmosphere chamber 2 is maintained within the set range (18%-19%), and the pressure difference between the inside of the dynamic modified atmosphere chamber 2 and the outside of the cabinet 1 is maintained within the set pressure difference range (±0.2kPa). Maintaining the oxygen concentration at 18%-19% can effectively inhibit the respiration and oxidation of most fruits and vegetables, significantly prolong the preservation period, and the concentration interval has little risk of anaerobic respiration for fruits and vegetables, and the preservation effect and energy consumption ratio reach a relatively optimal balance. By adjusting the pressure difference between the inside of the dynamic modified atmosphere chamber 2 and the outside of the cabinet 1, it is easier for the user to open the door. The dynamic modified atmosphere chamber 2 is located in the main volume space of the refrigerator refrigeration area, which is composed of the original refrigeration space as a whole, and adopts a double-door or a pair of doors structure.

[0022] In addition, a multi-dimensional sensing module 3 and a gas management module 4 are arranged in the dynamic modified atmosphere chamber 2. The gas management module 4 is compactly integrated in the space above the back of the dynamic modified atmosphere chamber 2, and air distribution plates with directional nozzles are arranged on the left and right sides of the top of the dynamic modified atmosphere chamber 2. The air distribution plates can make the nitrogen gas sprayed by the gas management module 4 to the dynamic modified atmosphere chamber 2 more uniform. A controllable active exhaust port is arranged in the center of the bottom rear side, and adjustable guide vanes are arranged inside the active exhaust port. The active exhaust port can discharge oxygen waste and the like generated by the gas management module 4.

[0023] The multi-dimensional sensing module 3 is configured to: Obtain door opening and closing data of the cabinet 1; the door opening and closing data includes: opening and closing state, opening angle, opening speed, opening duration, and door handle vibration frequency of the door body 11.

[0024] and a controller 5 connected to the multi-dimensional sensing module 3 and the gas management module 4, the controller 5 being configured to: Based on the door opening and closing data, the air intrusion amount is determined using an air intrusion amount model; the air intrusion amount model is generated by training historical door opening and closing data and corresponding air intrusion amount data.

[0025] For example, the air intrusion amount model is established by the following process: first, a baseline correspondence table between different door opening modes (time, angle combination) and air intrusion amount is established through experiments; then, in actual operation, the opening door speed correction factor, instantaneous pressure difference compensation and historical learning data are introduced to dynamically optimize the estimation; finally, through machine learning algorithm, the user habit is continuously learned, the mode switching threshold and recovery parameters are optimized, and the operation that may produce noise is arranged in non-quiet period.

[0026] Based on the air intrusion amount, the oxygen concentration in the dynamic air conditioning room 2 is maintained within a set range (18%-19%) and the pressure difference between the dynamic air conditioning room 2 and the outside of the box 1 is maintained within a set pressure difference range (±0.2kPa) by using the gas management module 4.

[0027] In this embodiment, the multi-dimensional sensing module 3 includes: A plurality of laser oxygen concentration sensors 31, the number of which is not less than 2, arranged in the return air duct of the dynamic air conditioning room 2, the laser oxygen concentration sensor 31 being configured to: Obtain the oxygen concentration value in the dynamic air conditioning room 2.

[0028] A micro differential pressure sensor 32 arranged in the dynamic air conditioning room 2, the micro differential pressure sensor 32 being configured to: Obtain the pressure value in the dynamic air conditioning room 2.

[0029] A multi-dimensional door state sensor 33 including a three-axis acceleration sensor and a door magnetic switch; the multi-dimensional door state sensor 33 is arranged inside the door handle of the box 1, the multi-dimensional door state sensor 33 being configured to: Obtain the door opening and closing data of the box 1.

[0030] Specifically, the opening and closing state of the door body 11 can be obtained through the door magnetic switch; the opening angle, opening speed and opening duration of the door body and the door handle vibration frequency can be obtained through the three-axis acceleration sensor, which will not be described in detail here.

[0031] As Figure 1As shown, it is a structural schematic diagram of the gas management module 4 in the present application.

[0032] In this embodiment, the gas management module 4 comprises: a membrane nitrogen-oxygen separator 42, a nitrogen-rich gas outlet end 421 of the membrane nitrogen-oxygen separator 42 is connected to the dynamic gas conditioning chamber 2 through an electromagnetic proportional valve 43 and a Venturi ejector 44; the membrane nitrogen-oxygen separator 42 is provided with an air inlet end 422 and an oxygen-rich waste gas outlet end 423; the membrane nitrogen-oxygen separator 42 is used to separate oxygen and nitrogen in the air, the oxygen is discharged to the outside of the box 1 through the oxygen-rich waste gas outlet end 423, and the nitrogen is discharged to the dynamic gas conditioning chamber 2 through the nitrogen-rich gas outlet end 421; the electromagnetic proportional valve 43 is used to open the air duct where the nitrogen-rich gas outlet end 421 is located, and nitrogen can be injected into the dynamic gas conditioning chamber 2 through the Venturi ejector 44 to neutralize the oxygen concentration in the dynamic gas conditioning chamber 2.

[0033] a miniature vacuum pump 45 connected to the vacuum buffer tank 46, the miniature vacuum pump 45 is used to extract air in the dynamic gas conditioning chamber 2. The miniature vacuum pump 45 is used to quickly reduce the oxygen concentration in the dynamic gas conditioning chamber 2; wherein when the miniature vacuum pump 45 starts or stops, the vacuum degree in the miniature vacuum pump 45 will fluctuate due to the change of flow, the vacuum buffer tank 46 balances the instantaneous flow change by storing or releasing gas, and maintains the stability of the vacuum degree in the miniature vacuum pump 45. When the miniature vacuum pump 45 is suddenly closed or the load changes, the vacuum buffer tank 46 can absorb the pressure mutation to prevent impact on the miniature vacuum pump 45 and prolong the service life of the miniature vacuum pump 45.

[0034] In this embodiment, the gas management module 4 further comprises: a normal pressure balance electromagnetic valve 47 connected to the dynamic gas conditioning chamber 2 and the outside of the box 1; the normal pressure balance electromagnetic valve 47 is used to maintain the pressure difference between the dynamic gas conditioning chamber 2 and the outside of the box 1 within a set pressure difference range.

[0035] As shown, it is a structural schematic diagram of the gas management module 4 in the present application. Figure 3 As shown, it is a flow chart of dynamic balance gas conditioning in the present application.

[0036] In this embodiment, the controller 5 is further configured to: When the door handle vibration frequency is greater than the preset frequency, adjust the opening of the normal pressure balance electromagnetic valve 47 to the maximum, so that the pressure between the dynamic gas conditioning chamber 2 and the outside of the box 1 is balanced.

[0037] Specifically, the multi-dimensional sensing module 3 detects the door opening intention (such as a specific vibration mode of hand contact with the door handle), i.e. the vibration frequency of the door handle is greater than the preset frequency, and the controller 5 immediately switches the opening degree of the normal pressure balance electromagnetic valve 47 to the fully open state, so that the pressure inside and outside the dynamic air conditioning chamber 2 is quickly balanced before the door is opened, realizing zero resistance door opening.

[0038] In this embodiment, the controller 5 is further configured to: If the air intrusion amount is less than the preset air intrusion amount, the electromagnetic proportional valve 43 is opened, the membrane nitrogen-oxygen separator 42 is controlled to spray nitrogen-rich gas into the dynamic air conditioning chamber 2 at a set flow rate, until the oxygen concentration in the dynamic air conditioning chamber 2 reaches a set range, and the opening degrees of the electromagnetic proportional valve 43 and the normal pressure balance electromagnetic valve 47 are adjusted, so that the oxygen concentration in the dynamic air conditioning chamber 2 is maintained within the set range, and the pressure difference between the dynamic air conditioning chamber 2 and the outside of the cabinet 1 is maintained within a set pressure difference range.

[0039] Specifically, when the user opens the door for a short time, i.e. the air intrusion amount into the dynamic air conditioning chamber 2 is small (the air intrusion amount is less than the preset air intrusion amount); the controller 5 only opens the electromagnetic proportional valve 43, and the membrane nitrogen-oxygen separator 42 sprays nitrogen-rich gas into the dynamic air conditioning chamber 2 at a set flow rate, until the oxygen concentration in the dynamic air conditioning chamber 2 reaches a set range, completing the oxygen concentration adjustment work in the dynamic air conditioning chamber 2, and then adjusting the opening degrees of the electromagnetic proportional valve 43 and the normal pressure balance electromagnetic valve 47, so that the oxygen concentration in the dynamic air conditioning chamber 2 is maintained within the set range, and the pressure difference between the dynamic air conditioning chamber 2 and the outside of the cabinet 1 is maintained within a set pressure difference range.

[0040] In this embodiment, the controller 5 is further configured to: If the air intrusion amount is greater than or equal to the preset air intrusion amount, the micro vacuum pump 45 is opened according to the preset time, and after the micro vacuum pump 45 is closed, the electromagnetic proportional valve 43 is opened, the membrane nitrogen-oxygen separator 42 is controlled to spray nitrogen-rich gas into the dynamic air conditioning chamber 2 at a set flow rate, until the oxygen concentration in the dynamic air conditioning chamber 2 reaches a set range, and the opening degrees of the electromagnetic proportional valve 43 and the normal pressure balance electromagnetic valve 47 are adjusted, so that the oxygen concentration in the dynamic air conditioning chamber 2 is maintained within the set range, and the pressure difference between the dynamic air conditioning chamber 2 and the outside of the cabinet 1 is maintained within a set pressure difference range.

[0041] Specifically, when the user opens the door for a long time, i.e. the air invasion amount into the dynamic air conditioning chamber 2 is large (the air invasion amount is greater than or equal to the preset air invasion amount); the controller 5 needs to start the micro vacuum pump 45 to quickly reduce the oxygen amount in the dynamic air conditioning chamber 2; after the micro vacuum pump 45 is closed, the electromagnetic proportional valve 43 is opened again, and the membrane nitrogen-oxygen separator 42 is used to spray nitrogen-rich gas to the dynamic air conditioning chamber 2 at a set flow rate until the oxygen concentration in the dynamic air conditioning chamber 2 reaches the set range, thereby completing the oxygen concentration adjustment in the dynamic air conditioning chamber 2, and then adjusting the opening degrees of the electromagnetic proportional valve 43 and the normal pressure balance electromagnetic valve 47 to maintain the oxygen concentration in the dynamic air conditioning chamber 2 within the set range and the pressure difference between the dynamic air conditioning chamber 2 and the outside of the box 1 within the set pressure difference range.

[0042] In this embodiment, the dynamic air conditioning chamber 2 is provided with an air distribution plate at the top, and the air distribution plates are oppositely arranged on both sides of the dynamic air conditioning chamber 2; the nitrogen gas is discharged through the nitrogen-rich gas outlet end 421 of the membrane nitrogen-oxygen separator 42, and is discharged to the dynamic air conditioning chamber 2 through the air distribution plate; wherein the nitrogen-rich gas outlet end 421 of the membrane nitrogen-oxygen separator 42 is connected to the nozzle array of the top air distribution plate through the electromagnetic proportional valve 43 and the Venturi ejector 44. Wherein, the position of the air distribution plate corresponds to the position of the door body.

[0043] The controller 5 is further configured to: If the air invasion amount is less than the preset air invasion amount and the number of openings of the door body 11 is one, the electromagnetic proportional valve 43 is opened, the membrane nitrogen-oxygen separator 42 is controlled to spray nitrogen-rich gas to the air distribution plate corresponding to the side of the opened door body 11 at a set flow rate, until the oxygen concentration in the dynamic air conditioning chamber 2 reaches the set range, and the opening degrees of the electromagnetic proportional valve 43 and the normal pressure balance electromagnetic valve 47 are adjusted to maintain the oxygen concentration in the dynamic air conditioning chamber 2 within the set range and the pressure difference between the dynamic air conditioning chamber 2 and the outside of the box 1 within the set pressure difference range.

[0044] It can be understood that the number of door openings also determines the amount of air invading the dynamic air conditioning chamber 2, so in this embodiment, by judging the number of door openings (one can be set through the door magnetic switch, and the other can be set through the door magnetic switch), and the door opening time determines whether it is necessary to open the electromagnetic proportional valve 43 corresponding to the two doors at the same time (if the number of doors is two, the electromagnetic proportional valve 43 and the venturi injector 44 can be separately arranged at the air distribution plate corresponding to the two doors, and the function of independently injecting nitrogen-rich gas in the area where each door is located can be realized), if the air invasion amount is less than the preset air invasion amount and the opening number of the door 11 is one, nitrogen-rich gas is injected into the air distribution plate corresponding to the opened door 11 side, thereby saving the cost generated during the use of the system.

[0045] In this embodiment, a sealing door seal 12 is arranged between the door 11 and the box body 1. Through the arrangement of the sealing door seal 12, the outflow of the gas in the dynamic air conditioning chamber 2 and the entry of the air outside the dynamic air conditioning chamber 2 into the dynamic air conditioning chamber 2 can be prevented, so that the stability of the oxygen amount in the dynamic air conditioning chamber 2 is maintained, that is, the preservation effect of the food is improved, and the cost generated during the operation of the system is reduced.

[0046] The present application provides a refrigerator dynamic balance air conditioning fresh-keeping system, and the specific implementation manner is as follows: During daily taking: the user opens the right door for 4 seconds to take the food therein. After closing the door, the system determines that it is a slight invasion (the air invasion amount is less than the preset air invasion amount), and only the right corresponding venturi injector 44 works, and the oxygen concentration in the dynamic air conditioning chamber 2 is maintained in the set range for about 1 minute.

[0047] During the food arrangement: the user opens all the doors 11 to arrange the food for 2 minutes. After closing the door, the system determines that it is a severe invasion (the air invasion amount is greater than or equal to the preset air invasion amount). First, the micro vacuum pump 45 is started to exhaust for about 15 seconds, and then the venturi injectors 44 on both sides are opened, and the oxygen concentration in the dynamic air conditioning chamber 2 is maintained in the set range for about 3 minutes.

[0048] Night maintenance: during the quiet period set by the user (such as early morning), if the system determines that there are more disturbances during the day, a complete air exhaust and air charging calibration cycle can be automatically performed to ensure long-term stability (the oxygen concentration in the dynamic air conditioning chamber 2 is maintained in the set range) to prevent the system from generating noise to disturb the user.

[0049] The application provides a refrigerator dynamic balance modified atmosphere fresh-keeping system, which accurately controls the working oxygen concentration in the optimal range of 18-19%, significantly reduces energy consumption and risks while ensuring excellent fresh-keeping effect, quickly responds to frequent door opening and closing disturbances through an air intrusion amount determination method, realizes zero resistance door opening feeling through the setting of the normal pressure balance electromagnetic valve 47, and combines a silent replacement-based operation mode to bring a non-susceptible and quiet user experience; meanwhile, the system has self-learning optimization capability and operates under mild working conditions close to normal pressure, and balances intelligence and high reliability. The perfect unity of fresh-keeping efficiency, energy consumption economy, environmental anti-interference and user experience is realized.

[0050] The application provides a refrigerator dynamic balance modified atmosphere fresh-keeping method, which is applied to the refrigerator dynamic balance modified atmosphere fresh-keeping system in any of the above embodiments, and includes the following steps. Obtain door opening and closing data of the cabinet; the door opening and closing data includes the opening and closing state, opening angle, opening speed, opening duration and door handle vibration frequency of the door. Based on the door opening and closing data, determine the air intrusion amount by using an air intrusion amount model; the air intrusion amount model is generated by training historical door opening and closing data and corresponding air intrusion amount data. If the air intrusion amount is less than a preset air intrusion amount, open the electromagnetic proportional valve, control the membrane method nitrogen-oxygen separator to spray nitrogen-rich gas to the dynamic modified atmosphere chamber at a set flow rate, until the oxygen concentration in the dynamic modified atmosphere chamber reaches a set range, adjust the opening degrees of the electromagnetic proportional valve and the normal pressure balance electromagnetic valve, so that the oxygen concentration in the dynamic modified atmosphere chamber is maintained in the set range, and the pressure difference between the dynamic modified atmosphere chamber and the cabinet outside is maintained in a set pressure difference range. If the air intrusion amount is greater than or equal to the preset air intrusion amount, open the micro vacuum pump according to a preset time, open the electromagnetic proportional valve after the micro vacuum pump is closed, control the membrane method nitrogen-oxygen separator to spray nitrogen-rich gas to the dynamic modified atmosphere chamber at a set flow rate, until the oxygen concentration in the dynamic modified atmosphere chamber reaches a set range, adjust the opening degrees of the electromagnetic proportional valve and the normal pressure balance electromagnetic valve, so that the oxygen concentration in the dynamic modified atmosphere chamber is maintained in the set range, and the pressure difference between the dynamic modified atmosphere chamber and the cabinet outside is maintained in a set pressure difference range.

[0051] It is worth noting that the effects of the above method embodiments can be referred to the effects of the above system embodiments, which are not described herein.

[0052] The above detailed description of the embodiments of the present application is merely intended to provide a further detailed description of the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above is only a specific implementation of the embodiments of the present application, and is not used to limit the protection scope of the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A dynamic balance controlled atmosphere preservation system for refrigerators, characterized in that, include: The enclosure (1) is equipped with a dynamic controlled atmosphere chamber (2). In addition, a multi-dimensional sensing module (3) and a gas management module (4) are installed in the dynamic controlled atmosphere room (2); the multi-dimensional sensing module (3) is configured as follows: Obtain the door opening and closing data of the box (1); the door opening and closing data includes: the opening and closing state of the door (11), opening angle, opening speed and opening duration, and the vibration frequency of the door handle; And a controller (5), the controller (5) being connected to the multi-dimensional sensing module (3) and the gas management module (4), the controller (5) being configured to: Based on the door opening and closing data, the air intrusion amount is determined using an air intrusion model; the air intrusion amount model is generated by training on historical door opening and closing data and corresponding air intrusion amount data. Based on the air intrusion amount, the gas management module (4) is used to maintain the oxygen concentration in the dynamic controlled atmosphere chamber (2) within a set range and the pressure difference between the dynamic controlled atmosphere chamber (2) and the outside of the box (1) within a set pressure difference range.

2. The refrigerator dynamic balance controlled atmosphere preservation system according to claim 1, characterized in that, The multi-dimensional sensing module (3) includes: A plurality of laser oxygen concentration sensors (31) are provided in the return air duct of the dynamic controlled atmosphere room (2), and the laser oxygen concentration sensors (31) are configured as follows: Obtain the oxygen concentration value in the dynamic controlled atmosphere chamber (2); A differential pressure sensor (32) is disposed in the dynamic controlled atmosphere chamber (2), and the differential pressure sensor (32) is configured as follows: Obtain the pressure value inside the dynamic controlled atmosphere chamber (2); A multi-dimensional door status sensor (33) is disposed inside the door handle of the housing (1), and the multi-dimensional door status sensor (33) is configured as follows: Obtain the door opening and closing data of the box (1).

3. The refrigerator dynamic balance modified atmosphere preservation system according to claim 1, characterized in that, The gas management module (4) includes: Located inside the module housing (41): A membrane nitrogen-oxygen separator (42) is provided, wherein the nitrogen-rich gas outlet end (421) of the membrane nitrogen-oxygen separator (42) is connected to the dynamic atmosphere-controlled chamber (2) through an electromagnetic proportional valve (43) and a Venturi injector (44); the membrane nitrogen-oxygen separator (42) is provided with an air inlet end (422) and an oxygen-rich exhaust gas outlet end (423); the membrane nitrogen-oxygen separator (42) is used to separate oxygen and nitrogen in the air, discharge the oxygen through the oxygen-rich exhaust gas outlet end (423) to the outside of the housing (1), and discharge the nitrogen through the nitrogen-rich gas outlet end (421) to the dynamic atmosphere-controlled chamber (2); A miniature vacuum pump (45) is connected to the vacuum buffer tank (46) and is used to extract air from the dynamic controlled atmosphere chamber (2).

4. A refrigerator dynamic balance controlled atmosphere preservation system according to claim 3, characterized in that, The gas management module (4) also includes: A normal pressure balancing solenoid valve (47) is connected to the outside of the dynamic atmosphere control chamber (2) and the box (1); the normal pressure balancing solenoid valve (47) is used to maintain the pressure difference between the inside of the dynamic atmosphere control chamber (2) and the outside of the box (1) within a set pressure difference range.

5. A refrigerator dynamic balance modified atmosphere preservation system according to claim 4, characterized in that, The controller (5) is also configured to: When the vibration frequency of the door handle is greater than the preset frequency, the opening of the atmospheric pressure balancing solenoid valve (47) is adjusted to the maximum to balance the pressure between the inside of the dynamic air conditioning chamber (2) and the outside of the box (1).

6. A refrigerator dynamic balance controlled atmosphere preservation system according to claim 4, characterized in that, The controller (5) is further configured to: If the air intrusion amount is less than the preset air intrusion amount, the electromagnetic proportional valve (43) is opened, and the membrane nitrogen-oxygen separator (42) is controlled to inject nitrogen-rich gas into the dynamic atmosphere-controlled chamber (2) at a set flow rate until the oxygen concentration in the dynamic atmosphere-controlled chamber (2) reaches the set range. The opening of the electromagnetic proportional valve (43) and the atmospheric pressure balance electromagnetic valve (47) is adjusted so that the oxygen concentration in the dynamic atmosphere-controlled chamber (2) is maintained within the set range and the pressure difference between the dynamic atmosphere-controlled chamber (2) and the outside of the box (1) is maintained within the set pressure difference range.

7. A refrigerator dynamic balance controlled atmosphere preservation system according to claim 4, characterized in that, The controller (5) is further configured to: If the air intrusion amount is greater than or equal to the preset air intrusion amount, the micro vacuum pump (45) is turned on according to the preset time. After the micro vacuum pump (45) is turned off, the electromagnetic proportional valve (43) is turned on to control the membrane nitrogen-oxygen separator (42) to spray nitrogen-rich gas into the dynamic atmosphere-controlled chamber (2) at a set flow rate until the oxygen concentration in the dynamic atmosphere-controlled chamber (2) reaches the set range. The opening of the electromagnetic proportional valve (43) and the atmospheric pressure balance electromagnetic valve (47) is adjusted so that the oxygen concentration in the dynamic atmosphere-controlled chamber (2) is maintained within the set range and the pressure difference between the dynamic atmosphere-controlled chamber (2) and the outside of the box (1) is maintained within the set pressure difference range.

8. A refrigerator dynamic balance controlled atmosphere preservation system according to claim 4, characterized in that, The top of the dynamic controlled atmosphere chamber (2) is provided with an air distribution plate, which is arranged opposite to each other on both sides of the dynamic controlled atmosphere chamber (2); the nitrogen gas is discharged through the nitrogen-rich gas outlet (421) and discharged into the dynamic controlled atmosphere chamber (2) through the air distribution plate. The controller (5) is further configured to: If the air intrusion amount is less than the preset air intrusion amount and the number of doors (11) opened is one, then the electromagnetic proportional valve (43) is opened, and the membrane nitrogen-oxygen separator (42) is controlled to spray nitrogen-rich gas into the air distribution plate corresponding to the side of the opened door (11) at a set flow rate until the oxygen concentration in the dynamic atmosphere control room (2) reaches the set range. The opening degree of the electromagnetic proportional valve (43) and the atmospheric pressure balance electromagnetic valve (47) is adjusted so that the oxygen concentration in the dynamic atmosphere control room (2) is maintained within the set range and the pressure difference between the dynamic atmosphere control room (2) and the outside of the box (1) is maintained within the set pressure difference range.

9. A refrigerator dynamic balance controlled atmosphere preservation system according to claim 1, characterized in that, A sealing door seal (12) is provided between the door (11) and the box (1).

10. A method for dynamic balance modified atmosphere preservation in a refrigerator, applied to a dynamic balance modified atmosphere preservation system for a refrigerator as described in any one of claims 1 to 9, characterized in that, include: Obtain the door opening and closing data of the enclosure; The door opening and closing data includes: the door's opening and closing status, opening angle, opening speed, opening duration, and the door handle vibration frequency; Based on the door opening and closing data, the air intrusion amount is determined using an air intrusion model; the air intrusion amount model is generated by training on historical door opening and closing data and corresponding air intrusion amount data. If the air intrusion amount is less than the preset air intrusion amount, the electromagnetic proportional valve is opened to control the membrane nitrogen-oxygen separator to inject nitrogen-rich gas into the dynamic controlled atmosphere chamber at a set flow rate until the oxygen concentration in the dynamic controlled atmosphere chamber reaches the set range. The opening of the electromagnetic proportional valve and the atmospheric pressure balance solenoid valve is adjusted to maintain the oxygen concentration in the dynamic controlled atmosphere chamber within the set range and the pressure difference between the dynamic controlled atmosphere chamber and the outside of the chamber within the set pressure difference range. If the air intrusion amount is greater than or equal to the preset air intrusion amount, the micro vacuum pump is turned on according to the preset time. After the micro vacuum pump is turned off, the electromagnetic proportional valve is turned on to control the membrane nitrogen-oxygen separator to inject nitrogen-rich gas into the dynamic atmosphere-controlled chamber at a set flow rate until the oxygen concentration in the dynamic atmosphere-controlled chamber reaches the set range. The opening of the electromagnetic proportional valve and the atmospheric pressure balance solenoid valve is adjusted to maintain the oxygen concentration in the dynamic atmosphere-controlled chamber within the set range and the pressure difference between the dynamic atmosphere-controlled chamber and the outside of the chamber within the set pressure difference range.

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