Fresh-keeping plasma-activated water cavitation system and method for fresh noodles

Abstract

The application discloses a kind of fresh wet noodles preservation plasma activation water cavitation system and method, the system includes high-frequency low-voltage driving power supply, embedded central processing unit, fluid pipeline, multistage cavitation reaction device, microchannel ozone generation device, mounting platform and magnetic control type gas flow proportional regulating valve.System utilizes microchannel discharge technology to generate ozone efficiently, and realizes multistage mixing and cavitation reaction of ozone and clean water by multistage alternating steady flow cavity and throat structure, to generate hydroxyl radical.Electrochemical detection unit integrated in the tail of system can monitor hydroxyl radical concentration on-line in real time, and embedded central processing unit dynamically regulates the opening of magnetic control valve according to monitoring data, to accurately adjust ozone dosage, to form closed-loop intelligent control.The application realizes the integration of hydroxyl radical generation, on-line sensing and process control, and the generated plasma activation water significantly improves the fresh wet noodles preservation capacity.

Description

Technical Field

[0001] This invention relates to the field of food preservation technology, and in particular to a plasma-activated water cavitation system and method for preserving fresh wet noodles. Background Technology

[0002] Fresh wet noodles, due to their high water content and rich nutrients, are highly susceptible to the growth of harmful microorganisms at room temperature, resulting in a short shelf life and becoming a bottleneck in their industrial production. This is especially true for convenience foods, where pathogenic bacteria contamination is a significant issue. Hydroxyl radicals (·OH), as one of the most reactive oxygen species with the highest oxidation potential, possess extremely strong non-selective oxidizing capabilities, effectively killing various harmful microorganisms and demonstrating significant advantages in advanced oxidation treatment of harmful microorganisms. Utilizing cavitation reactions to generate hydroxyl radicals has become a research hotspot in food preservation technology in recent years. The basic principle involves using hydrodynamic or acoustic methods to rapidly reduce local pressure below the liquid's saturated vapor pressure, forming cavitation bubbles. The collapse of these bubbles generates extreme high-temperature and high-pressure conditions, inducing the decomposition of water molecules and dissolved oxygen (or ozone) to generate hydroxyl radicals.

[0003] Regarding the control system, the invention patent with publication number CN117256899A provides a sterilization control system based on the combination of plasma and ozone. This system adjusts the output parameters of the non-equilibrium plasma module and the ozone generation module by real-time detection of whether the ozone concentration reaches a set threshold, thereby achieving closed-loop control of the sterilization process. However, this system primarily uses the ozone concentration signal as feedback, reflecting changes in the ozone content in the disinfection medium. Since the sterilization process of ozone dissolving in water is affected by various environmental factors (such as changes in external temperature and organic matter reactions), adjusting solely based on ozone concentration is insufficient to directly characterize the actual sterilization effect, thus limiting the precision of the sterilization process control.

[0004] Regarding the preservation process of fresh noodle products, the invention patent with publication number CN115381022A provides a green preservation process based on the synergistic effect of chitosan oligosaccharide-ozone solution and O2 / CO2 dual absorbents. This process involves introducing ozone into a chitosan oligosaccharide solution at low temperatures and using it during the dough mixing process to leverage the oxidative and antibacterial effects of ozone and extend the product's shelf life. However, in this scheme, ozone participates in the antibacterial process in a dissolved form under preset process conditions. The treatment process mainly follows predetermined parameters and does not further enhance the mechanism of ozone's action in the reaction process, nor does it establish a dynamic adjustment mechanism for influencing factors such as environmental conditions or different raw material characteristics.

[0005] Regarding the structure of cavitation reactors, the invention patent with publication number CN111348720A provides a hydraulic cavitation system based on an orifice plate. This system induces cavitation by creating a low-pressure zone through orifice plate throttling, which is used to degrade antibiotics in wastewater. However, this structure relies on a single or limited number of orifice plates, resulting in concentrated cavitation areas, uneven bubble distribution, and cavitation intensity significantly affected by operating parameters. This can easily lead to incomplete cavitation and unstable free radical yields, thus limiting its treatment efficiency and adaptability.

[0006] Furthermore, existing systems generally lack real-time online monitoring and feedback control of hydroxyl radical concentration during the reaction process. For example, although the utility model patent with publication number CN208485634U integrates temperature detection function and can adjust cavitation operation according to temperature to save energy, it does not involve direct or indirect monitoring of hydroxyl radicals, nor does it establish closed-loop control between monitoring signals and key operating parameters such as ozone addition. The system operates in an open-loop state for a long time, making it difficult to adaptively adjust according to changes in water quality and reaction progress.

[0007] In summary, the existing hydroxyl radical generation and fresh wet noodle preservation systems still have the following main problems: 1. Ozone generation relies on high-voltage discharge, which is energy-intensive, inefficient, and poses insulation and safety hazards; 2. The cavitation reactor has a simple structural design, but the cavitation region is limited and the bubble distribution is uneven, making it difficult to achieve continuous and stable high-efficiency free radical generation; 3. The lack of online real-time monitoring methods for hydroxyl radical concentration makes it impossible to accurately perceive the reaction process; 4. The systems generally lack intelligent control capabilities based on free radical concentration feedback. In particular, the ozone intake cannot be adjusted in real time according to the reaction dynamics, resulting in limited treatment efficiency and operational stability.

[0008] Therefore, there is an urgent need to develop a system that integrates efficient ozone generation, multi-stage cavitation enhancement, real-time monitoring of hydroxyl radicals, and intelligent feedback control to improve the efficiency, stability, and automation level of fresh wet noodle preservation. Summary of the Invention

[0009] To address these issues, embodiments of the present invention provide a plasma-activated water cavitation system and method for preserving fresh wet noodles, which solves problems in the prior art such as high energy consumption for ozone generation, uneven cavitation effect, lack of online monitoring of hydroxyl radicals, and inability to achieve closed-loop control based on real-time feedback.

[0010] To address the aforementioned technical problems, this invention provides a plasma-activated water cavitation system for preserving fresh wet noodles. The system includes: a high-frequency low-voltage driving power supply, an embedded central processing unit, a fluid pipeline, a multi-stage cavitation reaction device, a microchannel ozone generator, an installation platform, and a magnetically controlled gas flow proportional regulating valve. The installation platform includes an upper shell and a support base. The top of the upper shell is provided with a water outlet, and the bottom of the support base is provided with a water inlet. The fluid pipeline is connected to the multi-stage cavitation reaction device through the water outlet and the water inlet. The side of the support base is provided with a reaction gas supply channel, which is connected to the microchannel ozone generator through the lower air inlet of the lower shell. The multi-stage cavitation reaction device is equipped with a cavitation chamber and a capture chamber. The cavitation chamber is provided with alternating series-distributed flow stabilizing chambers and throats. The microchannel ozone generator is equipped with an ionization chamber, an embedded dielectric electrode assembly, an elastic conductive connection module, and a high-frequency low-voltage feed terminal. The ionization chamber is connected to the throat through several ozone infiltration holes, and the magnetically controlled gas flow ratio regulating valve is provided on the ozone infiltration holes. The embedded central processing unit is electrically connected to the high-frequency low-voltage driving power supply, the magnetically controlled gas flow proportional regulating valve, and the hydroxyl radical detection circuit installed in the capture chamber, and is used to perform closed-loop control of ozone generation and dosing based on the detected hydroxyl radical concentration signal.

[0011] Preferably, the magnetically controlled gas flow proportional regulating valve includes: A valve that can be deflected within the ozone infiltration channel has a magnetic material composite on its sidewalls. A corresponding magnetic needle is installed outside the valve body to apply a controllable magnetic field to the magnetic material to adjust the opening degree of the valve; The magnetic valve opening control circuit is electrically connected to the magnetic needle. This circuit is communicatively connected to the embedded central processing unit and is used to receive instructions and adjust the magnetic field strength to achieve precise dynamic control of ozone permeation flux.

[0012] Preferably, in the cavitation chamber, the throat is a contraction chamber with a small cross-sectional area, and the flow stabilization chamber is an expansion chamber with a large cross-sectional area. When the fluid flows through, it alternately experiences acceleration and depressurization, thereby triggering a multi-stage cavitation reaction. The ozone infiltration hole is located on the side wall of the throat.

[0013] Preferably, the capture chamber is located at the rear of the cavitation chamber, and has a sampling chamber and a reserved chamber inside. It has a three-electrode slot and a solution inlet at the top, and a waste liquid outlet at the bottom. The opening and closing of the sampling chamber is controlled by an electric push rod. The hydroxyl radical detection circuit is connected to the working electrode, auxiliary electrode, and reference electrode through the three-electrode slot.

[0014] Preferably, the working electrode is a glassy carbon electrode, the auxiliary electrode is a platinum column electrode, and the reference electrode is a saturated calomel electrode.

[0015] Preferably, in the microchannel ozone generating device, the embedded dielectric electrode assembly includes a plurality of square discharge electrodes and a micro-gap dielectric array disposed therebetween. One pole of the square discharge electrode is arranged in a slot on the outer wall of the multi-stage cavitation reaction device, and the other pole is arranged on the inner wall of the microchannel ozone generator. The square discharge electrode is connected to the high-frequency low-voltage feed terminal through the elastic conductive connection module.

[0016] Preferably, the ionization cavity is a cylindrical hollow structure made of ceramic material, and it is insulated from the square discharge electrode by the micro-gap dielectric array; the micro-gap dielectric array is made of silicon dioxide.

[0017] This invention also provides a plasma-activated water cavitation method for preserving fresh wet noodles, employing the plasma-activated water cavitation system for preserving fresh wet noodles as described above, and including the following steps: S1: Open the fluid pipeline and pump the purified water into the multi-stage cavitation reaction device through the inlet. S2: Inject oxygen into the reaction gas supply channel and turn on the high-frequency low-pressure drive power supply to make the microchannel ozone generator produce ozone; when the fluid flows through the throat, the ozone is drawn into the main fluid through the ozone infiltration hole and mixed by the negative pressure effect. S3: The gas-liquid mixture undergoes multi-stage cavitation reaction in alternating series of steady flow chambers and throats to generate hydroxyl radicals to improve the sterilization ability of purified water. The treated plasma-activated water is discharged through the outlet for use in the preservation of fresh wet noodles. S4: After periodically sampling through the capture chamber and adding the capture agent and electrolyte, the concentration of hydroxyl radicals is electrochemically detected using a hydroxyl radical detection circuit; S5: The embedded central processing unit receives the detection data, compares it with the preset threshold, generates control commands, and dynamically adjusts the opening degree of the magnetically controlled gas flow proportional regulating valve and / or the output parameters of the high-frequency low-voltage drive power supply to achieve closed-loop optimization control of hydroxyl radical generation and its concentration.

[0018] Preferably, in step S4, the capturing agent is salicylic acid, and the electrolyte is a phosphate buffer solution.

[0019] Preferably, in step S5, the closed-loop optimization control specifically involves: when the detected concentration of hydroxyl radicals is lower than a set threshold, the embedded central processing unit controls the opening of the magnetically controlled gas flow proportional regulating valve to increase the ozone dosage, and / or adjusts the output of the high-frequency low-voltage drive power supply to improve the ozone yield.

[0020] As can be seen from the above technical solutions, this invention application has the following beneficial effects: (1) This invention integrates an embedded central processing unit, a magnetically controlled gas flow proportional regulating valve, and an online hydroxyl radical detection unit to construct a closed-loop control system of "real-time sensing-feedback regulation". The system can automatically and accurately adjust the ozone dosing acceleration rate (by controlling the opening of the magnetically controlled valve) and generation power according to the hydroxyl radical concentration monitored in real time by the electrochemical detection unit, so that the reaction is always in the optimal state. This solves the problems of unstable treatment efficiency, reagent waste, or insufficient oxidation caused by the lack of real-time monitoring and feedback in the prior art, and realizes adaptive optimization and efficient and stable operation of the treatment process.

[0021] (2) The system of this invention adopts a multi-stage structure with alternating series connection of steady flow chamber and throat, continuously initiating intense multi-stage cavitation reactions in the fluid. At the same time, independently controlled ozone infiltration points are integrated on the sidewalls of each throat stage, utilizing the Venturi negative pressure effect to achieve efficient gas-liquid mixing. This synergistic design of "multi-stage cavitation" and "multi-stage air intake" greatly increases the contact opportunities and reaction time between ozone and bacterial pollutants, promotes the large-scale generation of hydroxyl radicals when cavitation bubbles collapse, and thus significantly improves the overall oxidation and decomposition efficiency of bacterial pollutants.

[0022] (3) This invention utilizes an embedded dielectric electrode assembly and a micro-gap dielectric array to construct a microchannel discharge structure. This design reduces the discharge gap to the micrometer level, allowing the gas to be broken down and ionized at a relatively low voltage (below kilovolts), efficiently generating ozone. Compared to traditional high-voltage corona discharge technology, this invention significantly reduces the system's driving voltage and energy consumption, reduces equipment heating and insulation design pressure, and improves the system's energy utilization efficiency and operational safety while achieving efficient ozone production. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Referring to the drawings will make the features and advantages of the present invention clearer. The drawings are illustrative and should not be construed as limiting the present invention in any way. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1This is a schematic diagram of the structure of a plasma-activated water cavitation system for preserving fresh wet noodles, provided in an embodiment of the present invention. Figure 2 This is a structural diagram of a plasma-activated water cavitation system for preserving fresh wet noodles, provided in an embodiment of the present invention. Figure 3 This is a structural diagram of the multi-stage cavitation reaction device and the microchannel ozone generation device provided in the embodiments of the present invention; Figure 4 This is a cross-sectional view of the microchannel ozone generator provided in an embodiment of the present invention. Figure 5 A cross-sectional view of a magnetically controlled proportional gas flow control valve provided in an embodiment of the present invention; Figure 6 A flow diagram of a plasma-activated water cavitation system for preserving fresh wet noodles provided in an embodiment of the present invention; Figure 7 A flowchart of a plasma-activated water cavitation method for preserving fresh wet noodles provided in an embodiment of the present invention.

[0024] Explanation of reference numerals in the accompanying drawings: 1. High-frequency low-voltage drive power supply; 2. Embedded central processing unit; 21. Hydroxyl radical detection circuit; 3. Fluid pipeline; 4. Multi-stage cavitation reaction device; 41. Slot; 42. Cavitation chamber; 421. Flow stabilization chamber; 422. Throat; 43. Capture chamber; 431. Three-electrode slot; 432. Sampling chamber; 433. Reserved chamber; 434. Solution inlet; 435. Waste liquid outlet; 44. Ozone infiltration hole; 5. Microchannel ozone generator; 51. Ionization chamber; 52. 521. Embedded dielectric electrode assembly; 522. Square discharge electrode; 523. Micro-gap dielectric array; 54. Elastic conductive connection module; 6. High-frequency low-voltage feed terminal; 7. Mounting platform; 61. Upper housing; 611. Water outlet; 62. Lower housing; 621. Lower vent; 63. Support base; 631. Reaction gas supply channel; 632. Water inlet; 7. Magnetic control gas flow proportional regulating valve; 71. Valve; 72. Magnetic material; 73. Magnetic needle; 74. Magnetic valve opening control circuit. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that the terms "first," "second," etc., used in this invention are merely for ease of description and to distinguish different components with the same name, and do not indicate a sequential or primary / secondary relationship. Furthermore, when an element is referred to as being "on" another element, the element may be directly on the other element, or indirectly on the other element with one or more intermediate elements inserted between them. When an element is referred to as being "connected to" another element, the element may be directly connected to the other element, or indirectly connected to the other element with one or more intermediate elements inserted between them. In the following text, the same reference numerals denote the same elements. The use of terms such as "upper," "lower," "top," "bottom," "front," "rear," "inner," and "outer" to indicate orientation or positional relationships in this invention is merely for ease of description and does not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0027] Example 1: To address the problems in existing fresh noodle preservation technologies, such as high energy consumption for ozone generation, uneven cavitation effects, lack of online monitoring of hydroxyl radicals, and inability to achieve closed-loop control based on real-time feedback. For example... Figure 1 As shown, this embodiment provides a plasma-activated water cavitation system for preserving fresh wet noodles, used to prepare high-concentration plasma-activated water and achieve intelligent process optimization. The system constitutes a complete monitoring-reaction-control closed loop, mainly including: a high-frequency low-voltage drive power supply 1, an embedded central processing unit 2, fluid pipelines 3, a multi-stage cavitation reaction device 4, a microchannel ozone generator 5, an installation platform 6, and a magnetically controlled gas flow proportional regulating valve 7.

[0028] like Figure 2 As shown, the installation platform 6, serving as the system's basic support and flow path integration component, consists of an upper shell 61, a lower shell 62, and a support base 63. The upper shell 61 has an outlet 611 at its top, and the support base 63 has an inlet 632 at its bottom. Clean water is pumped into the system through the inlet 632 by an external water pump (not shown), and the treated water is discharged through the outlet 611. A fluid pipeline 3 connects the inlet 632, the multi-stage cavitation reaction device 4, and the outlet 611, forming the main processing flow path. On the side of the support base 63, a reaction gas supply channel 631 is provided for introducing oxygen or air as a gas source for ozone generation. This reaction gas supply channel 631 is connected to the ionization chamber 51 of the microchannel ozone generator 5 through a lower vent 621 on the lower shell 62.

[0029] Combination Figure 2 , Figure 3 and Figure 5As shown, the multi-stage cavitation reaction device 4 is the core reaction unit of this invention, which integrates a cavitation chamber 42 and a capture chamber 43. The cavitation chamber 42 is designed as a multi-stage series structure, consisting of a flow-stabilizing chamber 421 and a throat 422 with alternating cross-sectional areas. The throat 422 is a chamber with a contracting cross-section, where the flow velocity increases and the static pressure decreases as the fluid passes through, forming a local low-pressure zone; the flow-stabilizing chamber 421 is a chamber with an expanding cross-section, where the fluid decelerates and the pressure rises. This alternating flow channel design causes the fluid to periodically experience sudden drops and rises in pressure during the flow process, thereby triggering a violent and continuous multi-stage cavitation reaction, providing ideal conditions for the generation, growth, and collapse of cavitation bubbles.

[0030] like Figure 4 As shown, the microchannel ozone generator 5 is responsible for efficiently generating ozone under low voltage. Its core components include an ionization cavity 51, an embedded dielectric electrode assembly 52, an elastic conductive connection module 53, and a high-frequency, low-voltage feed terminal 54. The embedded dielectric electrode assembly 52 consists of pairs of square discharge electrodes 521 and a precisely arranged micro-gap dielectric array 522. One square discharge electrode 521 is fixed in a slot 41 on the outer wall of the multi-stage cavitation reaction device 4, while the other is placed on the inner wall of the microchannel ozone generator 5. Both are connected to an external high-frequency, low-voltage driving power supply 1 via the elastic conductive connection module 53. When the high-frequency, low-voltage driving power supply 1 operates, a strong electric field is generated on both sides of the micron-sized dielectric array 522, causing oxygen passing through the ionization cavity 51 to undergo dielectric barrier discharge, efficiently converting it into ozone. The ionization cavity 51 is preferably made of a highly insulating, corrosion-resistant ceramic material to form a cylindrical cavity.

[0031] After ozone gas is output from the ionization chamber 51, it enters the main water flow through several ozone infiltration holes 44 opened on the side wall of the throat 422. Crucially, each ozone infiltration hole 44 is integrated with the aforementioned magnetically controlled gas flow proportional regulating valve 7.

[0032] The structure of the magnetically controlled gas flow proportional regulating valve 7 is as follows: Figure 5As shown, the magnetically controlled gas flow proportional regulating valve 7 is a key actuator for precise dosing. It includes: a flexible valve 71 disposed within the flow channel, with a magnetic material 72 composited on its surface; a magnetic needle 73 mounted externally to the valve body corresponding to the valve position; and a magnetically controlled valve opening control circuit 74 electrically connected to the magnetic needle 73. The magnetically controlled valve opening control circuit 74 is communicatively connected to the embedded central processing unit 2. During operation, the embedded central processing unit 2 issues instructions based on a control algorithm, adjusting the current flowing through the magnetic needle 73 via the magnetically controlled valve opening control circuit 74, thereby changing the intensity of the magnetic field it generates. This magnetic field acts on the magnetic material 72 on the valve 71, driving the valve to undergo controllable elastic deflection, thereby precisely adjusting the effective flow area of ​​the ozone infiltration hole 44, achieving dynamic and programmable control of the ozone dosing rate. Utilizing the inherent negative pressure environment of the throat 422, ozone is automatically drawn into the high-speed water flow, achieving efficient gas-liquid mixing.

[0033] The capture chamber 43, serving as an online monitoring module, is located at the rear of the cavitation chamber 42. For example... Figure 3 As shown, its interior is divided into a sampling chamber 432 and a reserved chamber 433. The capture chamber 43 has a three-electrode slot 431 and a solution inlet 434 at the top, and a waste liquid outlet 435 at the bottom, with the bottom designed as a sloping surface to facilitate waste liquid drainage. The hydroxyl radical detection circuit 21 is connected to the three-electrode system inserted therein via the three-electrode slot 431. Preferably, the three-electrode system includes: a glassy carbon working electrode, a platinum column auxiliary electrode, and a saturated calomel reference electrode.

[0034] The embedded central processing unit 2 is the "intelligent brain" of the system. It is connected to the high-frequency low-voltage drive power supply 1, the magnetic valve opening control circuit 74, and the hydroxyl radical detection circuit 21 through circuits, forming a complete sensing and control network.

[0035] Example 2: like Figure 7 As shown, this invention provides a plasma-activated water cavitation method for preserving fresh wet noodles. This method employs the plasma-activated water cavitation system for preserving fresh wet noodles as described in Example 1 above, and includes the following steps: Step S1: System Start-up and Water Intake. Open the valve and water pump on the fluid pipeline 3. The purified water enters the system from the inlet 632 at a certain flow rate and flows through the multi-stage cavitation reaction device 4.

[0036] Step S2: Ozone Generation and Dosing. Oxygen is introduced through the reaction gas supply channel 631. The high-frequency low-voltage drive power supply 1 is activated, which generates a high-frequency low-voltage electric field between the square discharge electrodes 521, generating ozone through dielectric barrier discharge in the ionization chamber 51 of the microchannel ozone generator 5. When the fluid flows through the throat 422, a negative pressure is generated due to the Venturi effect. Under the action of the pressure difference, ozone is drawn into the main water flow through the ozone infiltration hole 44 and mixed by the initial set opening of the magnetically controlled gas flow proportional regulating valve 7.

[0037] Step S3: Multi-stage cavitation reaction. The gas-liquid mixture enters the multi-stage cavitation chamber 42, which is formed by alternating series connection of the steady flow chamber 421 and the throat 422. Under intense pressure fluctuations, a large number of cavitation bubbles are generated and instantly collapse, converting ozone and water molecules into highly reactive hydroxyl radicals (·OH) under local extreme conditions. The hydroxyl radicals rapidly oxidize and kill any bacteria that may be present in the flour and purified water, achieving sterilization. The treated plasma-activated water is finally discharged through the outlet 611 for use in preserving fresh wet noodles.

[0038] Step S4: Online detection of hydroxyl radicals. The embedded central processing unit 2 initiates the detection program periodically or on demand. It first opens the sampling chamber 432, allowing a portion of the reaction fluid to flow in. Then, it closes the sampling chamber 432 and automatically adds a specific amount of phosphate buffer solution (supporting electrolyte) and salicylic acid solution (hydroxyl radical scavenger) to the reserved chamber 433 through the solution inlet 434. Salicylic acid reacts with hydroxyl radicals to generate stable hydroxylated products. The hydroxyl radical detection circuit 21 controls the three-electrode system to perform electrochemical detection of the reaction solution (e.g., differential pulse voltammetry). By detecting the oxidation current signal of the hydroxylated products, the concentration of hydroxyl radicals in the fluid is indirectly and quantitatively calculated. After detection, the waste liquid outlet 435 is opened to drain the reaction waste liquid, and the capture chamber 43 returns to its initial state.

[0039] Step S5: Intelligent Feedback and Closed-Loop Control. The hydroxyl radical detection circuit 21 transmits the detected concentration signal to the embedded central processing unit 2 in real time. The embedded central processing unit 2 compares and analyzes the measured concentration with the preset optimal process concentration threshold. If the concentration is lower than the threshold, it indicates insufficient oxidation intensity, and the processor generates control commands: on the one hand, it increases the opening of the magnetically controlled gas flow proportional regulating valve 7 through the magnetically controlled valve opening control circuit 74 to increase the ozone dosage; on the other hand, it can adjust the output power or frequency of the high-frequency low-voltage drive power supply 1 to change the ozone yield. Conversely, if the concentration is too high, the opening is reduced or the power is lowered accordingly to avoid reagent waste and over-oxidation. Through this continuous "monitoring-analysis-adjustment" closed loop, the system can adaptively maintain hydroxyl radicals within the optimal concentration range, thereby optimizing operating energy consumption and treatment efficiency while ensuring that the plasma-activated water has a high efficiency in killing bacteria.

[0040] In summary, this invention integrates efficient and low-consumption ozone generation, enhanced multi-stage cavitation, in-situ online detection, and precise feedback regulation through innovative structural integration and intelligent control methods. This effectively solves the problems of high energy consumption, uneven cavitation, lack of real-time monitoring and closed-loop regulation in existing technologies, and significantly improves the efficiency, stability, and automation level of sterilization in the preparation of fresh wet noodles.

[0041] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A plasma-activated water cavitation system for preserving fresh wet noodles, characterized in that, include: High-frequency low-voltage drive power supply (1), embedded central processing unit (2), fluid pipeline (3), multi-stage cavitation reaction device (4), microchannel ozone generator (5), installation platform (6), and magnetically controlled gas flow proportional regulating valve (7). The installation platform (6) includes an upper shell (61) and a support base (63). The upper shell (61) has an outlet (611) at the top and an inlet (632) at the bottom. The fluid pipeline (3) is connected to the multi-stage cavitation reaction device (4) through the outlet (611) and the inlet (632). The side of the support base (63) is provided with a reaction gas supply channel (631), which is connected to the microchannel ozone generator (5) through the lower air inlet (621) of the lower shell (62); The multi-stage cavitation reaction device (4) is provided with a cavitation chamber (42) and a capture chamber (43) inside. The cavitation chamber (42) is provided with a flow stabilizing chamber (421) and a throat (422) that are alternately connected in series. The microchannel ozone generator (5) is equipped with an ionization chamber (51), an embedded dielectric electrode assembly (52), an elastic conductive connection module (53), and a high-frequency low-voltage feed terminal (54). The ionization chamber (51) is connected to the throat (422) through several ozone infiltration holes (44), and the ozone infiltration holes (44) are equipped with the magnetically controlled gas flow proportional regulating valve (7). The embedded central processing unit (2) is electrically connected to the high-frequency low-voltage driving power supply (1), the magnetically controlled gas flow proportional regulating valve (7), and the hydroxyl radical detection circuit (21) set in the capture chamber (43), respectively, and is used to perform closed-loop control of ozone generation and addition based on the detected hydroxyl radical concentration signal.

2. The plasma-activated water cavitation system for preserving fresh wet noodles according to claim 1, characterized in that, The magnetically controlled gas flow proportional regulating valve (7) includes: A valve (71) that can be deflected and disposed in the ozone infiltration hole (44) channel has a magnetic material (72) on its sidewall. A corresponding magnetic needle (73) is provided outside the valve body to apply a controllable magnetic field to the magnetic material (72) to adjust the opening degree of the valve (71); The magnetic valve opening control circuit (74) is electrically connected to the magnetic needle (73). This circuit is communicatively connected to the embedded central processing unit (2) and is used to receive instructions and adjust the magnetic field strength to achieve precise dynamic control of ozone permeation flux.

3. The plasma-activated water cavitation system for preserving fresh wet noodles according to claim 1, characterized in that, In the cavitation chamber (42), the throat (422) is a contraction chamber with a small cross-sectional area, and the flow stabilization chamber (421) is an expansion chamber with a large cross-sectional area. When the fluid flows through, it alternates between acceleration and depressurization, thereby triggering a multi-stage cavitation reaction between ozone and purified water. The ozone infiltration hole (44) is located on the side wall of the throat (422).

4. The plasma-activated water cavitation system for preserving fresh wet noodles according to claim 1, characterized in that, The capture chamber (43) is located at the tail of the cavitation chamber (42). It has a sampling chamber (432) and a reserved chamber (433) inside. It has a three-electrode slot (431) and a solution inlet (434) at the top and a waste liquid outlet (435) at the bottom. The hydroxyl radical detection circuit (21) is connected to the working electrode, the auxiliary electrode and the reference electrode through the three-electrode slot (431).

5. The plasma-activated water cavitation system for preserving fresh wet noodles according to claim 4, characterized in that, The working electrode is a glassy carbon electrode, the auxiliary electrode is a platinum column electrode, and the reference electrode is a saturated calomel electrode.

6. The plasma-activated water cavitation system for preserving fresh wet noodles according to claim 1, characterized in that, In the microchannel ozone generator (5), the embedded dielectric electrode assembly (52) includes a plurality of square discharge electrodes (521) and a micro-gap dielectric array (522) disposed therebetween. One pole of the square discharge electrode (521) is arranged around the slot (41) on the outer wall of the multi-stage cavitation reaction device (4), and the other pole is arranged on the inner wall of the microchannel ozone generator (5). The square discharge electrode (521) is connected to the high-frequency low-voltage feed terminal (54) through the elastic conductive connection module (53).

7. The plasma-activated water cavitation system for preserving fresh wet noodles according to claim 6, characterized in that, The ionization cavity (51) is a cylindrical hollow structure made of ceramic material, and it is insulated from the square discharge electrode (521) by the micro-gap dielectric array (522); the micro-gap dielectric array (522) is made of silicon dioxide.

8. A plasma-activated water cavitation method for preserving fresh wet noodles, employing the plasma-activated water cavitation system for preserving fresh wet noodles as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1: Open the fluid pipeline (3), and pump the purified water into the multi-stage cavitation reaction device (4) through the inlet (632); S2: Inject oxygen into the reaction gas supply channel (631) and turn on the high-frequency low-pressure drive power supply (1) to generate ozone in the microchannel ozone generator (5); when the fluid flows through the throat (422), the ozone is drawn into the main fluid through the ozone infiltration hole (44) and mixed by the negative pressure effect. S3: The gas-liquid mixture undergoes multi-stage cavitation reaction in the alternating series of steady flow chambers (421) and throat (422) to generate hydroxyl radicals to improve the sterilization ability of the purified water. The treated plasma-activated water is discharged through the outlet (611) for the preservation of fresh wet noodles. S4: The concentration of hydroxyl radicals is electrochemically detected by periodically sampling through the capture chamber (43), adding capture agent and electrolyte, and then using the hydroxyl radical detection circuit (21); S5: The embedded central processing unit (2) receives the detection data and compares it with the preset threshold, generates control instructions, dynamically adjusts the opening degree of the magnetically controlled gas flow proportional regulating valve (7) and / or the output parameters of the high-frequency low-voltage drive power supply (1), and realizes closed-loop optimization control of hydroxyl radical generation and its concentration.

9. The plasma-activated water cavitation method for preserving fresh wet noodles according to claim 8, characterized in that, In step S4, the capturing agent is salicylic acid, and the electrolyte is a phosphate buffer solution.

10. The plasma-activated water cavitation method for preserving fresh wet noodles according to claim 8, characterized in that, In step S5, the closed-loop optimization control specifically means that when the detected concentration of hydroxyl radicals is lower than the set threshold, the embedded central processing unit (2) controls to increase the opening of the magnetically controlled gas flow proportional regulating valve (7) to increase the ozone dosage, and / or adjusts the output of the high-frequency low-voltage driving power supply (1) to improve the ozone yield.

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