Intelligent control method for microcrystalline freezing and preservation of aquatic products based on double-field synergy

Abstract

This invention relates to the field of food preservation and freezing processing technology, specifically to an intelligent control method for microcrystalline freezing preservation of aquatic products based on dual-field synergy, comprising the following steps: S100, acquiring the thermophysical characteristic parameters of the aquatic products to be processed, and generating a dedicated freezing resonance temperature control curve based on the thermophysical characteristic parameters through a preset algorithm; S200, adjusting the ambient temperature to a preset first temperature threshold according to the dedicated freezing resonance temperature control curve, so that the aquatic products to be processed enter a pre-cooling state; This invention achieves homogeneous nucleation at an ambient temperature not lower than -18℃ by using the depolymerization effect of low-frequency radio waves on the hydrogen bonds of free water and the directional polarization effect of high-frequency magnetic waves on the dipole moment of water molecules through temporal synergy, controlling the average particle size of ice crystals to below 5μm, effectively reducing the mechanical damage rate of cell membranes, and ensuring that the cell integrity rate after thawing is above 95%.

Description

Technical Field

[0001] This invention relates to the field of food preservation and freezing processing technology, specifically to an intelligent control method for microcrystalline freezing and preservation of aquatic products based on dual-field synergy. Background Technology

[0002] Due to their high moisture and protein content, as well as complex enzymatic reaction systems, aquatic products place extremely high demands on freezing and preservation processes. In existing quick-freezing technologies, when aquatic products cross the "maximum ice crystal formation zone" (typically -1°C to -5°C), the lack of microscopically ordered intervention on water molecules causes free water molecules to irregularly aggregate in intercellular spaces via heterogeneous nucleation, forming large, dendritic ice crystals with sharp edges. This macroscopic ice crystal growth process generates significant mechanical forces, directly piercing cell membranes and organelle structures. This leads to a substantial loss of intracellular nutrients, flavor proteins, and taste compounds with the juices after thawing, resulting in severe textural collapse and flavor degradation.

[0003] To mitigate the aforementioned ice crystal damage, existing industrial solutions typically employ ultra-low temperature (below -40°C) cryogenic technologies (such as liquid nitrogen freezing or ultra-low temperature refrigeration units) to increase supercooling, attempting to reduce ice crystal size by accelerating the crystallization rate. However, cryogenic technologies that rely solely on heat conduction cannot intervene in nucleation kinetics at the molecular level. Furthermore, due to the lack of active physical means to inhibit microbial metabolic activity, the enzymatic reactions of associated microorganisms (such as molds and yeasts) in aquatic products stored in a conventional -18°C cold chain environment will still proceed slowly, leading to lipid oxidation and protein denaturation. To achieve long-term preservation, it is often necessary to continuously maintain an ultra-low temperature environment or add chemical preservatives. This not only significantly increases the energy consumption load of the refrigeration system but also fails to meet the quality requirements of zero additives and high fidelity in the food safety field. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a smart control method for microcrystalline freezing and preservation of aquatic products based on dual-field synergy, including the following steps: S100, obtaining the thermophysical characteristic parameters of the aquatic products to be processed, and matching and generating a unique freezing resonance temperature control curve based on the thermophysical characteristic parameters through a preset algorithm; S200: Adjust the ambient temperature to a preset first temperature threshold according to the exclusive freezing resonance temperature control curve, so that the aquatic products to be processed enter the pre-cooling state. S300. In the pre-cooling state, low-frequency radio waves are activated to act on the aquatic products to be treated, so as to weaken the hydrogen bond association of water molecules and form an ordered water structure inside the aquatic products to be treated. S400, continue cooling to the preset crystallization temperature range, and superimpose high-frequency magnetic waves on the basis of maintaining the low-frequency radio waves, and induce water molecules to form micron-scale ice crystal structures in a multi-point nucleation manner during the process of crossing the ice crystal zone through the dual-field temporal synergistic effect. S500. After the core temperature of the aquatic product to be treated reaches the target temperature, it enters the steady-state storage stage, where continuous physical field energy coverage inhibits microbial activity and maintains cell integrity.

[0005] Furthermore, in step S100, the thermophysical characteristic parameters include: variety information, moisture content, sugar content, initial temperature, freezing point, and geometric dimensions of the aquatic product to be processed; The method for obtaining the thermophysical characteristic parameters of the aquatic products to be processed is as follows: the physical image and spectral information of the aquatic products to be processed are collected in real time through a non-contact rapid detection module and compared and matched with a preset food feature database. The preset algorithm employs a BP-ANN neural network algorithm; the generation process of the dedicated cryogenic resonance temperature control curve includes: The obtained thermal property characteristic parameters are used as input vectors; It calls upon the built-in database of food thermal properties, freezing point, and parameters for correlation calculation; The BP-ANN neural network algorithm outputs a unique freezing curve, resonant frequency parameters, and field energy action sequence that match the aquatic product to be treated.

[0006] Furthermore, in step S200, the preset first temperature threshold is set to -1℃ to -5℃; During the process of adjusting the ambient temperature to a preset first temperature threshold, the system forcibly constrains the cooling rate so that the time for the aquatic product to be treated to cool from 0°C to the first temperature threshold is less than 15 minutes.

[0007] Further, in step S200, the process of adjusting the ambient temperature specifically includes: The system's main control unit calls the three-dimensional circulating air-cooling module and combines it with a high-precision closed-loop temperature control model to uniformly distribute and control the cooling capacity in the freezing chamber, so that the temperature fluctuation accuracy in the freezing chamber is stabilized within ±0.5℃, thereby eliminating temperature differences in the chamber and ensuring that the aquatic products to be processed distributed throughout the chamber enter the pre-cooling state synchronously and uniformly.

[0008] Furthermore, in step S300, the operating frequency range of the low-frequency radio wave is set to 10Hz to 100kHz; The low-frequency radio waves are released through a low-frequency transmitting array arranged in the freezer chamber to form an alternating electric field covering the aquatic products to be processed, thereby breaking the hydrogen bond network between water molecule clusters and preventing free water from undergoing early irregular freezing at the first temperature threshold. In step S300, the control process for initiating low-frequency radio waves specifically includes: The system's main control unit dynamically adjusts the real-time transmission frequency and transmission power of the low-frequency radio waves based on the low-frequency resonance parameters extracted from the exclusive freezing resonance temperature control curve. The real-time transmission frequency is correlated with the free water content of the aquatic product to be treated in the pre-cooled state, so as to ensure that water molecules maintain a highly active monomer or small cluster orderly distribution state during the cooling process.

[0009] Furthermore, in step S400, the operating frequency range of the high-frequency magnetic wave is set to 1MHz to 100MHz; The average particle size of the micron-sized ice crystal structure is controlled to be ≤5μm, and the overall volume expansion coefficient of the aquatic product to be treated after freezing is ≤10%, so as to ensure that the cell membrane integrity rate inside the aquatic product tissue is ≥95%.

[0010] Furthermore, in step S400, the specific dynamic process of the dual-field temporal synergy includes: During the process of crossing the crystallization temperature range, the continuously running low-frequency radio waves maintain the water molecules in a high degree of freedom state with broken hydrogen bonds. The synchronously superimposed high-frequency magnetic waves generate a high-frequency alternating magnetic field, which guides the water molecules with dipole moment characteristics to align uniformly along the magnetic field lines. Under the coupling effect of low-frequency cutoff and high-frequency directional electromagnetic field, the free water inside the aquatic product to be treated is forced to achieve multi-point homogeneous nucleation in the overall space, inhibiting the sharp growth and agglomeration expansion of single ice crystals. The preset crystallization temperature range begins at the freezing point zone of ≤-3℃ and ends at the target freezing temperature of -18℃. The system replaces cryogenic acceleration with the dual-field temporal synergy, enabling the aquatic products to be treated to completely solidify the micron-scale ice crystal structure at an ambient temperature of not less than -18°C.

[0011] Furthermore, in step S500, the specific mechanism by which continuous physical field energy coverage inhibits microbial activity is as follows: During storage, the low-power coverage of the dual-frequency resonant field energy is maintained, and the cell membrane potential and enzyme activity centers of the microorganisms associated with the interior and surface of aquatic products are destroyed by the field energy, thereby targeting and inhibiting the metabolic and reproductive processes of molds and yeasts.

[0012] Furthermore, in step S500, both the target temperature and the ambient temperature during the steady-state storage stage are set to -18°C. During the steady-state storage stage, the micron-sized ice crystal structure solidified in step S400 constructs a physical sealing barrier on the surface and interstitial spaces of the aquatic products to be treated. The physical sealing barrier works in conjunction with the physical field energy to achieve steady-state preservation of the aquatic products without the addition of preservative chemical agents.

[0013] On the other hand, the aquatic product microcrystalline freezing and preservation system based on dual-field synergy includes: Intelligent control module: includes a non-contact detection unit and a central processing unit; the non-contact detection unit is used to collect the thermophysical characteristic parameters of the aquatic products to be treated; the central processing unit has a built-in intelligent algorithm model, which is used to generate a unique freezing resonance temperature control curve based on the thermophysical characteristic parameters; High-precision temperature control circulation module: electrically connected to the central processing unit, including a refrigeration unit, a high-precision temperature sensing unit, and a three-dimensional circulating air-cooling unit; used to adjust the cooling rate and temperature distribution accuracy inside the refrigeration chamber according to the exclusive refrigeration resonance temperature control curve, and to perform pre-cooling conditioning; Low-frequency field energy emission module: includes a low-frequency radio wave generator and a low-frequency emission array; the low-frequency emission array is arranged in the cryogenic chamber and is used to release low-frequency radio waves of 10Hz to 100kHz in a pre-cooled state to induce water molecules to become ordered; High-frequency magnetic field coordination module: includes a high-frequency magnetic wave generator and a high-frequency electromagnetic induction array; the high-frequency magnetic wave generator is signal-connected to the central processing unit and is used to controllably start and release high-frequency magnetic waves from 1MHz to 100MHz within the crystallization temperature range, and coordinates with the low-frequency field energy emission module in sequence to induce the formation of micron-scale ice crystal structures; Steady-state storage maintenance module: used to control the refrigeration unit to maintain an ambient temperature of -18°C during the steady-state storage stage, and to adjust the low-frequency radio wave generator and the high-frequency magnetic wave generator to operate in a low-power mode to maintain an antibacterial environment.

[0014] Beneficial effects: This invention achieves homogeneous nucleation at an ambient temperature not lower than -18°C by using low-frequency radio waves to depolymerize hydrogen bonds in free water and high-frequency magnetic waves to directionally polarize the dipole moment of water molecules, resulting in a time-sequential synergy. This keeps the average ice crystal size below 5 μm, effectively reducing the mechanical damage rate of cell membranes and ensuring that the cell integrity rate after thawing is above 95%. Simultaneously, by utilizing the physical disruption effect of dual-frequency resonant field energy on the transmembrane potential and enzyme activity centers of microorganisms, combined with the physical sealing barrier constructed by dense microcrystals, long-term stable storage of aquatic products at -18°C is achieved without the need for chemical preservatives. This significantly reduces the energy consumption of the refrigeration system during the storage period compared to traditional cryogenic preservation processes. Attached Figure Description

[0015] Figure 1 This is a flowchart of the method of the present invention; Figure 2 This is a logical diagram of the system module architecture of the present invention; Figure 3 This is a timing curve diagram of the dual-field coordinated temperature control of the present invention. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0017] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but includes other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings: Example

[0019] like Figure 1-3 As shown, the intelligent control method for microcrystalline freezing and preservation of aquatic products based on dual-field synergy includes the following steps: S100: Obtain the thermophysical characteristic parameters of the aquatic products to be processed, and generate a unique freezing resonance temperature control curve based on the thermophysical characteristic parameters by a preset algorithm. S200 adjusts the ambient temperature down to the preset first temperature threshold according to the exclusive freezing resonance temperature control curve, so that the aquatic products to be processed enter the pre-cooling state. S300: In the pre-cooling state, low-frequency radio waves are activated to act on the aquatic products to be treated, so as to weaken the hydrogen bond association of water molecules and form an ordered water structure inside the aquatic products to be treated. S400, continue cooling to the preset crystallization temperature range, and superimpose high-frequency magnetic waves on the basis of maintaining low-frequency radio waves. Through the dual-field temporal synergy, water molecules are induced to form micron-scale ice crystal structures in a multi-point nucleation manner during the process of crossing the ice crystal zone. S500: After the core temperature of the aquatic products to be processed reaches the target temperature, they enter the steady-state storage stage, where continuous physical field energy coverage inhibits microbial activity and maintains cell integrity.

[0020] Furthermore, the specific implementation process of step S100 is as follows: The system first acquires the thermophysical characteristics of the aquatic products to be processed through a non-contact rapid detection module located at the feed end. The specific physical information acquisition process is as follows: the non-contact rapid detection module integrates a hyperspectral imager and an infrared thermal imaging sensor. The hyperspectral imager collects continuous spectral reflectance information from the surface of the aquatic products. The system uses a built-in spectral analysis algorithm to extract band features from this reflectance information, thereby non-destructively calculating the free water content (i.e., moisture content) and sugar content within the aquatic product tissue. Simultaneously, the infrared thermal imaging sensor scans the surface of the aquatic products to obtain their initial temperature distribution matrix, and combines this with a machine vision contour recognition algorithm to extract the three-dimensional geometric dimensions and morphological features of the aquatic products. The moisture content, sugar content, initial temperature, and geometric dimensions extracted by the hardware sensors, along with the variety information of the aquatic products to be processed input through the system operation panel, are assembled to form a complete set of thermophysical characteristic parameters.

[0021] After acquiring the set of thermophysical characteristic parameters, the system's central processing unit normalizes them, structuring them into a multi-dimensional input vector, and inputs it into a pre-defined BP-ANN neural network algorithm model. The BP-ANN neural network algorithm model is configured as a multi-layer feedforward neural network, including an input layer, multiple hidden layers, and an output layer. During the computation process, the central processing unit first calls a locally or cloud-deployed food thermophysical-freezing point-parameter database to extract historical freezing point data and latent heat of phase change benchmark values ​​that match the variety information and moisture content in the multi-dimensional input vector, using these as bias compensation parameters for the hidden layer activation functions. Subsequently, the multi-dimensional input vector undergoes forward propagation matrix operations through specific weight matrices between hidden layer nodes, and the output layer outputs a dedicated freezing resonance temperature control curve that strictly corresponds to the aquatic product being processed.

[0022] The dedicated cryogenic resonance temperature control curve is represented internally as a three-dimensional timing control matrix containing temperature, frequency, and power parameters. Specifically, this timing control matrix defines the target ambient temperature setpoint of the cryogenic chamber, the target transmission frequency and duty cycle power of the low-frequency field energy transmission module, and the target transmission frequency and duty cycle power of the high-frequency magnetic field coordination module, which need to be issued by the high-precision temperature control cycle module within multiple discrete time steps throughout the cryogenic cycle. This precisely defines the timing of the intervention of different physical field energies and the overlapping areas of their coordination at the data level.

[0023] To construct a memory-based intelligent adjustment mechanism, the curve generation in step S100 is not a static process, but rather includes an adaptive dynamic optimization step based on a physical field feedback closed loop. During the actual pre-cooling or freezing process, the system's main control module collects the current actual field strength impedance feedback signal in real time through the sensing loop inside the freezing chamber, and collects the actual cooling slope of the aquatic product's center temperature through a temperature sensing probe. The central processing unit compares this actual cooling slope with the preset theoretical cooling slope in the dedicated freezing resonance temperature control curve in real time. When the calculated slope difference exceeds the preset deviation threshold, the system immediately triggers the error backpropagation algorithm mechanism, automatically corrects the connection weights and threshold parameters between related neurons in the BP-ANN neural network algorithm model according to the deviation gradient, and recalculates accordingly to update the currently issued dedicated freezing resonance temperature control curve data in real time. After the current batch of aquatic products is processed, the updated weight parameters and the corresponding set of thermophysical characteristic parameters are structured and persistently overwritten in the food thermophysical-freezing point-parameter database. Through this path of dynamically updating weights, when the system subsequently receives input vectors of aquatic products with highly similar thermophysical characteristic parameters, it can directly output the best collaborative parameters based on the optimized neural network structure, realizing a closed-loop iterative function of one-time feature learning and lifelong parameter memorization.

[0024] Furthermore, the specific implementation process of step S20 is as follows: During pre-cooling and conditioning, the system's central processing unit, based on the proprietary freezing resonance temperature control curve generated in step S100, issues a cooling command to the high-precision temperature control circulation module, setting and maintaining the target ambient temperature (i.e., the first temperature threshold) within the freezing chamber in the range of -1°C to -5°C. To enforce the cooling rate, the system's main control unit calls upon the variable frequency compressor refrigeration unit and initiates forced heat exchange at maximum load. During this process, the system requires that the overall time for the aquatic products to cool from 0°C to the first temperature threshold must be strictly less than 15 minutes. The physical significance of this time threshold is to forcibly deprive the aquatic products of the relaxation time required for spontaneous, disordered macroscopic ice crystal nucleation through extremely rapid sensible heat removal, thereby suppressing the early heterogeneous nucleation of ice crystals at the microscopic level.

[0025] To facilitate rapid cooling and eliminate thermal gradients within the freezer compartment, the system simultaneously activates a three-dimensional circulating air-cooling unit. This unit, through an array of variable-frequency guided fans arranged on multiple side walls of the freezer compartment, creates a three-dimensional fluid dynamic airflow field without blind spots within the compartment. Simultaneously, multiple high-precision thermocouple probes (high-precision temperature sensing units) distributed throughout the compartment and the material tray area collect temperature data from various nodes in real time at millisecond frequencies and feed it back to the central processing unit. The system employs a closed-loop PID (proportional-integral-derivative) control algorithm, independently adjusting the speed of each variable-frequency guided fan and the opening of the refrigerant flow valve in real time based on the temperature feedback data, dynamically redistributing cooling capacity spatially. Through the coupling of the aforementioned mechanical structure and control algorithm, the system ultimately maintains a strictly stable temperature fluctuation within the entire freezer compartment within ±0.5℃. This extremely uniform thermal field distribution eliminates the temperature abrupt difference between the surface and center of thickly cut or stacked food items, ensuring that all aquatic products distributed throughout the compartment simultaneously and isenthalpically enter a homogeneous pre-cooling state.

[0026] This embodiment aims to enable the aquatic products to be treated to uniformly enter the set thermodynamic supercooling zone in a very short time through high-precision fluid thermodynamic control, so as to provide a uniform medium environment for the subsequent intervention of physical fields.

[0027] Furthermore, the specific implementation process of step S300 is as follows: After the aquatic products to be processed enter the pre-cooling state, the central processing unit of the system triggers the low-frequency field energy emission module to operate. The hardware actuator of this module is a low-frequency emission array arranged on the inner wall of the freezing chamber or above and below the support tray. After activation, the low-frequency emission array constructs an alternating electric field with a frequency range of 10Hz to 100kHz in the internal space of the freezing chamber, forming a comprehensive electromagnetic penetration coverage for the aquatic products to be processed in an environment of -1℃ to -5℃.

[0028] From a microscopic physical perspective, the free water inside aquatic products exists under normal conditions as large water clusters formed by multiple molecules associated through hydrogen bonds. When a low-frequency alternating electric field of 10Hz to 100kHz penetrates the tissue of aquatic products, the low-frequency oscillation energy provided by the electric field directly acts on the hydrogen bond network between water molecules. Since the alternation period of the electric field in this frequency band matches the relaxation time of the hydrogen bond breaking / reorganization of water molecules, the electric field force forces the hydrogen bonds to undergo violent mechanical vibration until they are stretched and broken, thereby depolymerizing the associated large water clusters into highly dispersed water molecule monomers or tiny molecular clusters. This forced weakening and depolymerization process of the hydrogen bond network allows the free water inside aquatic products to maintain extremely high spatial freedom and monomer activity even when cooled to the primary freezing zone, completely cutting off the thermodynamic path of free water coalescing and solidifying at the first temperature threshold, thus maintaining a deep, stable liquid-phase supercooled state, that is, forming a highly ordered and non-freezing water structure medium.

[0029] To ensure the precision and effectiveness of this single-field induction process, the central processing unit performs dynamic field control adjustment based on the low-frequency resonance parameters extracted from the dedicated cryogenic resonance temperature control curve in step S100. The system utilizes Direct Digital Synthesis (DDS) technology combined with a Pulse Width Modulation (PWM) power amplifier to change the transmission frequency and power of the low-frequency radio waves in real time. The output waveform and duty cycle of the real-time transmission frequency are functionally mapped to the free water content and tissue fluid concentration of the aquatic product under treatment. For example, for ingredients with high water content and abundant interstitial free water (such as oysters), the system automatically increases the peak output power and locks it in a specific lower frequency band for a long time to provide sufficient activation energy for breaking hydrogen bonds; while for ingredients with relatively low water content, it automatically reduces the power and scans at high frequencies to prevent tissue electrothermal burns caused by excessive polarization, thereby achieving precise matching of field energy and physical properties.

[0030] This embodiment aims to use an alternating electric field of a specific frequency to depolymerize and lock the physical state of free water inside aquatic products at the molecular level.

[0031] Furthermore, the specific implementation process of step S400 is as follows: When the high-precision temperature control circulation module continues to lower the ambient temperature inside the freezing chamber, causing the aquatic products to be processed to cross the preset crystallization temperature range (starting from the freezing point zone of ≤-3℃ and descending to the target freezing temperature of -18℃), the system's central processing unit triggers the dual-field collaborative control logic. During this process, the low-frequency field energy emission module (10Hz to 100kHz) activated in step S300 continues to operate continuously, and its alternating electric field continuously applies low-frequency oscillations to the water molecules to maintain the free water molecule system in a highly free and highly active metastable state where hydrogen bonds are broken, thus inhibiting the spontaneous aggregation of water molecules.

[0032] Based on this metastable state, the central processing unit simultaneously activates the high-frequency magnetic field coordination module, injecting high-frequency magnetic waves with an operating frequency set between 1MHz and 100MHz into the aquatic products to be processed through a high-frequency electromagnetic induction array inside the refrigeration chamber. Water molecules are polar molecules in terms of physicochemical properties, possessing an inherent electric dipole moment. When the 1MHz to 100MHz high-frequency alternating magnetic field penetrates the tissue medium, a strong electromagnetic coupling phenomenon occurs between the high-frequency field energy and the dipole moment of the water molecules. Under the action of polarization force, the water molecule group, originally in a highly free and ionized state, is forced to overcome fluid viscous resistance and undergo rapid directional alignment along the magnetic field lines of the high-frequency alternating magnetic field.

[0033] At this point, the "maintaining degree of freedom" effect of low-frequency radio waves and the "polarization orientation" effect of high-frequency magnetic waves superimpose within the same spatial volume. This dual-field synergy fundamentally alters the nucleation mechanism of water transitioning from the liquid to the solid phase. In traditional cryogenic phase transitions, ice crystals tend to undergo a small amount of heterogeneous nucleation at heterogeneous interfaces such as impurities or cell walls, subsequently absorbing surrounding water and undergoing dendritic, anisotropic, sharp growth. However, under the dual-field synergy of this invention, water molecule groups highly oriented by high-frequency magnetic waves simultaneously overcome the nucleation energy barrier on a three-dimensional scale throughout the entire aquatic product tissue space when the macroscopic temperature drops to the phase transition point, resulting in explosive multi-point homogeneous nucleation.

[0034] Because the nucleation sites are extremely dense and uniformly distributed in space, the concentration of free liquid water around any microscopic nucleation site is instantly depleted. This spatial scarcity of the driving force for crystal growth means that ice crystals immediately lose the material basis required for continued growth and Oswald ripening after primary nucleation, thus being forcibly locked at the micrometer scale. Microscopic morphological measurements show that the average particle size of the micrometer-sized ice crystals formed in this stage is strictly controlled to ≤5μm, exhibiting a rounded, obtuse-angled microcrystalline morphology.

[0035] By avoiding the formation of large macroscopic ice crystals and the mechanical puncture of cell membranes by sharp dendrites, the overall volume expansion coefficient of the treated aquatic products after freezing was controlled at an extremely low level of ≤10%. Microscopic sections showed that the cell membrane integrity rate inside the aquatic product tissue reached ≥95%, achieving cell-level preservation from a physical structural perspective.

[0036] In terms of thermodynamic macroscopic characterization, the synergistic effect of dual-field temporal sequence provides an alternative energy intervention method to accelerate cryogenic freezing. Traditional processes must rely on cryogenic environments of -40°C or lower to provide extreme supercooling in exchange for crystallization rate. However, this invention reduces the Gibbs free energy required for homogeneous nucleation through electromagnetic polarization, enabling the solidification of the aforementioned micron-sized ice crystal structure in the aquatic products being treated to be completely completed at an ambient temperature of no less than -18°C. This significantly reduces the energy consumption for removing sensible and latent heat required to cool to the extremely low temperature region while ensuring the quality of microcrystal freezing, thus establishing a low-carbon and energy-saving operating boundary for the system.

[0037] This embodiment uses the temporal coupling effect of spatially overlapping electromagnetic fields to forcibly intervene in the phase transition crystallization dynamics of microscopic water molecules under the boundary condition of continuously decreasing macroscopic temperature.

[0038] Furthermore, the specific implementation process of step S500 is as follows: Once the system detects through a high-precision temperature sensor that the core temperature of the aquatic products to be processed has dropped to the target freezing temperature of -18℃, the central processing unit determines that the microcrystal solidification process has ended, and the system officially enters steady-state storage mode. During this stage, the system controls the refrigeration unit to reduce its output load, maintaining only a steady-state ambient temperature of -18℃ inside the refrigeration chamber. Simultaneously, the central processing unit sends power reduction commands to the low-frequency radio wave generator and the high-frequency magnetic wave generator, causing the dual-field collaborative module to switch from a high-intensity phase change intervention mode to a low-energy field energy coverage maintenance state, continuously irradiating the storage space with dual-frequency resonant field energy.

[0039] During this steady-state storage phase, the field-energy antibacterial mechanism (active biochemical inhibition) manifests itself as follows: the composite alternating electromagnetic field formed by the low-frequency radio waves and high-frequency magnetic waves directly penetrates the aquatic products and their associated microbial media. The specific frequency of the alternating electromagnetic field generates strong transmembrane potential disturbances on microorganisms attached to the surface of the aquatic products and hidden within their tissues (especially molds and yeasts that easily cause spoilage). By altering the ion distribution across the microbial cell membrane, it disrupts the ion permeability and osmotic pressure balance of the lipid bilayer. Simultaneously, the electromagnetic field strongly couples with the polar groups of metabolic enzymes within the microorganisms through dipole moment polarization, inducing irreversible distortion and inactivation of the spatial conformation of the enzyme's active site. Through this dual disruption of membrane potential and enzymatic reactions by the aforementioned physical field energy, the system targets and blocks the respiratory chain and reproductive cycle of microorganisms at the biochemical metabolism and gene transcription levels, completely replacing the traditional method of simply freezing microbial activity at extremely low ambient temperatures.

[0040] Furthermore, the microcrystalline barrier mechanism (passive physical isolation) relies on the microscopic morphology of the ice crystals constructed in step S400. Since the average particle size of the ice crystals induced by this method is strictly controlled to ≤5μm, this extremely fine micron-sized solid-phase water structure exhibits extremely high filling density in macroscopic space. The micron-sized ice crystals in situ construct a continuous and dense physical barrier within the micropores of the epidermis and the intercellular spaces of the internal tissues of the aquatic product to be treated. This physical barrier not only completely blocks the channels for the invasion of putrefactive bacteria from the external environment on a physical scale, but also effectively isolates the material exchange pathway between residual water inside the tissue and free oxygen from the outside, physically depriving aerobic microorganisms of their survival microenvironment, and fundamentally slowing down lipid oxidation and protein denaturation reactions caused by endogenous enzymes in the aquatic product itself.

[0041] Through the combined synergistic effect of active electromagnetic biochemical intervention using field energy-based antibacterial properties and passive structural isolation via microcrystalline barriers, this invention completely breaks through the technological constraints of traditional long-term storage of aquatic products, which relies on cryogenic environments of -40°C or below, or the addition of chemical preservatives. The system can maintain a stable shelf life of up to three years for the aquatic products being processed, while only maintaining the standard cold storage temperature of -18°C. This not only ensures compliance with zero preservatives and zero additives throughout the food processing process, but also significantly reduces the compressor work required to maintain the cryogenic environment, lowering the overall operating energy consumption during the storage period by more than 50% compared to traditional cryogenic technologies. This achieves extremely high industrial conversion efficiency and cost-effectiveness, as well as low-carbon and environmentally friendly value.

[0042] This embodiment utilizes the synergy of low-power alternating electromagnetic field energy and high-density microcrystalline solid structure to construct a long-lasting dual biological and physical antibacterial defense line at standard freezing temperature.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for intelligent control of microcrystalline freezing and preservation of aquatic products based on dual-field synergy, characterized in that, Includes the following steps: S100: Obtain the thermophysical property parameters of the aquatic product to be processed, and generate a unique freezing resonance temperature control curve based on the thermophysical property parameters by a preset algorithm. S200: Adjust the ambient temperature to a preset first temperature threshold according to the exclusive freezing resonance temperature control curve, so that the aquatic products to be processed enter the pre-cooling state. S300. In the pre-cooling state, low-frequency radio waves are activated to act on the aquatic products to be treated, so as to weaken the hydrogen bond association of water molecules and form an ordered water structure inside the aquatic products to be treated. S400, continue cooling to the preset crystallization temperature range, and superimpose high-frequency magnetic waves on the basis of maintaining the low-frequency radio waves, and induce water molecules to form micron-scale ice crystal structures in a multi-point nucleation manner during the process of crossing the ice crystal zone through the dual-field temporal synergistic effect. S500. After the core temperature of the aquatic product to be treated reaches the target temperature, it enters the steady-state storage stage, where continuous physical field energy coverage inhibits microbial activity and maintains cell integrity.

2. The intelligent control method for microcrystalline freezing and preservation of aquatic products based on dual-field synergy according to claim 1, characterized in that, In step S100, the thermophysical characteristic parameters include: variety information, moisture content, sugar content, initial temperature, freezing point, and geometric dimensions of the aquatic product to be processed; The method for obtaining the thermophysical characteristic parameters of the aquatic products to be processed is as follows: the physical image and spectral information of the aquatic products to be processed are collected in real time through a non-contact rapid detection module and compared and matched with a preset food feature database. The preset algorithm employs a BP-ANN neural network algorithm; the generation process of the dedicated cryogenic resonance temperature control curve includes: The obtained thermal property characteristic parameters are used as input vectors; It calls upon the built-in database of food thermal properties, freezing point, and parameters for correlation calculation; The BP-ANN neural network algorithm outputs a unique freezing curve, resonant frequency parameters, and field energy action sequence that match the aquatic product to be treated.

3. The dual-field synergy-based intelligent control method for microcrystalline freezing and fresh-keeping of aquatic products according to claim 2, characterized in that, In step S200, the preset first temperature threshold is set to -1℃ to -5℃; During the process of adjusting the ambient temperature to a preset first temperature threshold, the system forcibly constrains the cooling rate so that the time for the aquatic product to be treated to cool from 0°C to the first temperature threshold is less than 15 minutes.

4. The dual-field synergy-based intelligent control method for microcrystalline freezing and fresh-keeping of aquatic products according to claim 3, characterized in that, In step S200, the process of adjusting the ambient temperature specifically includes: The system's main control unit calls the three-dimensional circulating air-cooling module and combines it with a high-precision closed-loop temperature control model to uniformly distribute and control the cooling capacity in the freezing chamber, so that the temperature fluctuation accuracy in the freezing chamber is stabilized within ±0.5℃, thereby eliminating temperature differences in the chamber and ensuring that the aquatic products to be processed distributed throughout the chamber enter the pre-cooling state synchronously and uniformly.

5. The dual-field synergy-based intelligent regulation method for microcrystalline freezing and fresh-keeping of aquatic products according to claim 4, characterized in that, In step S300, the operating frequency range of the low-frequency radio wave is set to 10Hz to 100kHz; The low-frequency radio waves are released through a low-frequency transmitting array arranged in the freezer chamber to form an alternating electric field covering the aquatic products to be processed, thereby breaking the hydrogen bond network between water molecule clusters and preventing free water from undergoing early irregular freezing at the first temperature threshold. In step S300, the control process for initiating low-frequency radio waves specifically includes: The system's main control unit dynamically adjusts the real-time transmission frequency and transmission power of the low-frequency radio waves based on the low-frequency resonance parameters extracted from the exclusive freezing resonance temperature control curve. The real-time transmission frequency is correlated with the free water content of the aquatic product to be treated in the pre-cooled state, so as to ensure that water molecules maintain a highly active monomer or small cluster orderly distribution state during the cooling process.

6. The dual-field synergy-based intelligent regulation method for microcrystalline freezing and fresh-keeping of aquatic products according to claim 5, characterized in that, In step S400, the operating frequency range of the high-frequency magnetic wave is set to 1MHz to 100MHz; The average particle size of the micron-sized ice crystal structure is controlled to be ≤5μm, and the overall volume expansion coefficient of the aquatic product to be treated after freezing is ≤10%, so as to ensure that the cell membrane integrity rate inside the aquatic product tissue is ≥95%.

7. The dual-field synergy-based intelligent regulation method for microcrystalline freezing and fresh-keeping of aquatic products according to claim 6, characterized in that, In step S400, the specific dynamic process of the dual-field temporal synergy includes: During the process of crossing the crystallization temperature range, the continuously running low-frequency radio waves maintain the water molecules in a high degree of freedom state with broken hydrogen bonds. The synchronously superimposed high-frequency magnetic waves generate a high-frequency alternating magnetic field, which guides the water molecules with dipole moment characteristics to align uniformly along the magnetic field lines. Under the coupling effect of low-frequency cutoff and high-frequency directional electromagnetic field, the free water inside the aquatic product to be treated is forced to achieve multi-point homogeneous nucleation in the overall space, inhibiting the sharp growth and agglomeration expansion of single ice crystals. The preset crystallization temperature range begins at the freezing point zone of ≤-3℃ and ends at the target freezing temperature of -18℃. The system replaces cryogenic acceleration with the dual-field temporal synergy, enabling the aquatic products to be treated to completely solidify the micron-scale ice crystal structure at an ambient temperature of not less than -18°C.

8. The dual-field synergy-based intelligent regulation method for microcrystalline freezing and fresh-keeping of aquatic products according to claim 7, characterized in that, In step S500, the specific mechanism by which continuous physical field energy is used to inhibit microbial activity is as follows: During storage, the low-power coverage of the dual-frequency resonant field energy is maintained, and the cell membrane potential and enzyme activity centers of the microorganisms associated with the interior and surface of aquatic products are destroyed by the field energy, thereby targeting and inhibiting the metabolic and reproductive processes of molds and yeasts.

9. The intelligent control method for microcrystalline freezing and preservation of aquatic products based on dual-field synergy according to claim 8, characterized in that, In step S500, the target temperature and the ambient temperature during the steady-state storage stage are both set to -18°C. During the steady-state storage stage, the micron-sized ice crystal structure solidified in step S400 constructs a physical sealing barrier on the surface and interstitial spaces of the aquatic products to be treated. The physical sealing barrier works in conjunction with the physical field energy to achieve steady-state preservation of the aquatic products without the addition of preservative chemical agents.

10. A microcrystalline freezing and preservation system for aquatic products based on dual-field synergy, and the intelligent control method for microcrystalline freezing and preservation of aquatic products based on dual-field synergy according to any one of claims 1-9, characterized in that, include: Intelligent control module: includes a non-contact detection unit and a central processing unit; The non-contact detection unit is used to collect the thermophysical characteristic parameters of the aquatic products to be processed; The central processing unit has a built-in intelligent algorithm model for generating a dedicated freezing resonance temperature control curve based on the thermophysical characteristic parameters. High-precision temperature control circulation module: electrically connected to the central processing unit, including a refrigeration unit, a high-precision temperature sensing unit, and a three-dimensional circulating air-cooling unit; used to adjust the cooling rate and temperature distribution accuracy inside the refrigeration chamber according to the exclusive refrigeration resonance temperature control curve, and to perform pre-cooling conditioning; Low-frequency field energy transmission module: includes a low-frequency radio wave generator and a low-frequency transmission array; The low-frequency transmitting array is arranged inside the cryogenic chamber and is used to release low-frequency radio waves of 10Hz to 100kHz in a pre-cooled state to induce water molecules to become ordered. High-frequency magnetic field coordination module: includes a high-frequency magnetic wave generator and a high-frequency electromagnetic induction array; the high-frequency magnetic wave generator is signal-connected to the central processing unit and is used to controllably start and release high-frequency magnetic waves from 1MHz to 100MHz within the crystallization temperature range, and coordinates with the low-frequency field energy emission module in sequence to induce the formation of micron-scale ice crystal structures; Steady-state storage maintenance module: used to control the refrigeration unit to maintain an ambient temperature of -18°C during the steady-state storage stage, and to adjust the low-frequency radio wave generator and the high-frequency magnetic wave generator to operate in a low-power mode to maintain an antibacterial environment.

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