Mass flow control method, system and equipment based on modified magnetic induction valve material

Abstract

The invention discloses a mass flow control method, system and equipment based on a modified magnetic induction valve material, and belongs to the technical field of flow control corresponding to G05B. The method is applied to a flow control valve structure composed of a cavity double-circular-truncated-cone type valve body, a cylindrical valve element and the like, and a magnetostriction execution component material is modified in the modes of doping nano magnetic particles, directionally optimizing a crystal structure, locking a film through surface magnetic performance and the like; the cantilever beam is driven to bend and the valve element slides by utilizing the magnetic field telescopic characteristic of the modified magnetic induction sheet, and the coil current is dynamically adjusted by combining a flow detection feedback signal so as to regulate the opening degree of a valve port. The corresponding control system comprises a modified magnetic induction execution module, a valve body installation module, a magnetic field driving module and the like. The magnetic conductivity, the response sensitivity and the high-temperature stability of the magnetic induction material are remarkably improved, the magnetic hysteresis loss and the temperature drift are reduced, the flow control precision and the operation reliability are effectively improved in combination with the adaptive sealing structure design, and the applicable working condition range is widened.

Description

Technical Field

[0001] This invention relates to the technical field of flow control, and in particular to a mass flow control method, system, and device based on modified magnetic valve materials. Background Technology

[0002] Fluid flow control devices are core equipment for automatic regulation in G05B category (general control or regulation systems), and flow control valves are core components for achieving precise flow regulation in fluid transport systems.

[0003] Magnetostrictive flow control valves, with their advantages of fast response and compact structure, are widely used in hydraulic transmission, chemical conveying, and other fields. Most existing magnetostrictive flow control valves use traditional magnetostrictive materials to manufacture the actuators. For example, the magnetostrictive cantilever beam driven flow control valve disclosed in patent CN105605010A uses the expansion and contraction characteristics of a magnetostrictive sheet under a magnetic field to drive the valve core movement, thereby achieving flow regulation.

[0004] However, in practical applications, traditional magnetostrictive materials have significant drawbacks: Firstly, their low magnetic permeability and insufficient magnetic field response sensitivity result in a large delay in valve core movement response, making it difficult to meet the requirements of high-precision dynamic flow regulation. Secondly, they exhibit high hysteresis losses and are prone to magnetic attenuation or even demagnetization under high-temperature conditions, leading to valve control failure. Furthermore, significant temperature drift further affects the stability of flow control. In addition, the sealing structure of traditional flow control valves is poorly compatible with magnetostrictive materials, easily leading to sealing failure and fluid leakage under high-temperature conditions, further reducing flow control accuracy.

[0005] In view of the shortcomings of the existing technology, there is an urgent need for a flow control technology solution that can improve the stability of magnetic properties, response sensitivity and high temperature adaptability. Summary of the Invention

[0006] The purpose of this invention is to provide a mass flow control method, system, and device based on modified magnetic valve materials. Addressing the technical problems of existing magnetostrictive flow control valves (such as the structure disclosed in patent CN105605010A), where traditional magnetostrictive materials suffer from low magnetic permeability, insufficient response sensitivity, easy magnetic attenuation at high temperatures, significant temperature drift, and poor compatibility between the sealing structure and the material, resulting in low flow control accuracy and a narrow operating condition adaptability range, this invention provides a mass flow control scheme based on modified magnetic valve materials. Through material modification and synergistic structural optimization, it improves the accuracy, stability, and high-temperature adaptability of flow control.

[0007] The objective of this invention can be achieved through the following technical solutions: In a first aspect, embodiments of this application provide a mass flow control method based on modified magnetic valve materials, comprising the following steps: The magnetostrictive actuator of the flow control valve is made of modified magnetic material. The preparation process of the modified magnetic material includes doping with nano-magnetic particles, directional optimization of crystal structure, or designing a stepped sealing structure on the valve sealing surface in combination with the characteristics of the modified magnetic material. The modified magnetic sheet prepared by the modified magnetic material is glued to the metal sheet cantilever beam. The expansion and contraction characteristics of the modified magnetic sheet under the action of the external coil magnetic field are used to drive the metal sheet cantilever beam to bend, thereby driving the cylindrical valve core to slide along the inner cavity of the hollow double frustum valve body. By combining the flow signal fed back in real time by the flow detection module, the input current parameter of the external coil is adjusted to change the magnetic field strength, dynamically controlling the extension length of the modified magnetic sheet, and then adjusting the movement of the cylindrical valve core, so as to achieve precise control of the valve opening degree between the annular oil groove of the cylindrical valve core and the oil inlet and outlet of the hollow double-turret valve body. For multi-fluid operating conditions, a fluid adaptability adjustment layer is added inside the modified magnetic valve to dynamically adjust the valve's magnetic control parameters according to the fluid properties, thereby maintaining the stability of the magnetic properties of the modified magnetic sheet under high-temperature conditions.

[0008] As a preferred embodiment of the present invention, the doped nanomagnetic particles are nano-samarium cobalt or nano-Fe3O4 particles, with a doping mass ratio of 2%-5%.

[0009] As a preferred embodiment of the present invention, the method of directional optimization of the crystal structure is a magnetic field-assisted sintering process, which causes the grains of the modified magnetic material to be oriented along the direction of the magnetic field of the coil.

[0010] As a preferred embodiment of the present invention, the modified magnetic material bonded to the valve sealing surface is a surface magnetic performance locking film, which is an aluminum nitride-silicon oxide composite coating with a film thickness controlled between 1μm and 2.5μm, so that the temperature drift coefficient of the modified magnetic material under operating conditions of -30℃ to 450℃ is less than or equal to ±0.2% / ℃.

[0011] As a preferred technical solution of the present invention, the adjustment amount is calculated based on the deviation value by means of a PID adjustment algorithm, wherein the deviation value is the difference between the actual flow rate value and the preset flow rate value.

[0012] As a preferred embodiment of the present invention, the method for calculating the adjustment amount is as follows: ΔI=K p ×ΔQ+K i ×∫ΔQdt+K d ×d(ΔQ) / dt, Where ΔI represents the adjustment amount, ΔQ represents the deviation value, which is the difference between the actual flow rate and the preset flow rate, and K... p K i and K d All are weighting coefficients.

[0013] Secondly, embodiments of this application provide a mass flow control system based on modified magnetic valve materials, applicable to a mass flow control method based on modified magnetic valve materials, comprising: A modified magnetic actuation module includes a modified magnetic sheet, a metal sheet cantilever beam, and a cylindrical valve core. The modified magnetic sheet is glued to the metal sheet cantilever beam. The two ends of the metal sheet cantilever beam are glued to the cylindrical valve core and the fixed end of the cantilever beam, respectively. The cylindrical valve core is provided with an annular oil groove that matches the oil inlet and oil outlet. The valve body mounting module includes a hollow double frustum valve body and a cantilever beam fixed end. The cantilever beam fixed end is fastened to the right end of the hollow double frustum valve body by fastening screws. The hollow double frustum valve body is provided with an oil inlet and an oil outlet, and slides with a cylindrical valve core. The magnetic field drive module includes a coil fitted into the right small frustum of the hollow double frustum valve body, which is used to output an adjustable magnetic field to drive the extension and retraction of the modified magnetic sheet. The flow detection feedback module is used to collect fluid flow signals in real time and feed them back to the control unit; The control unit is used to adjust the coil input current according to the flow feedback signal, dynamically control the extension length of the modified magnetic sheet, and thus regulate the valve opening degree to achieve precise flow control.

[0014] As a preferred embodiment of the present invention, a polytetrafluoroethylene-fluororubber composite sealing ring is provided at the sliding fit between the hollow double-turbo valve body and the cylindrical valve core.

[0015] As a preferred embodiment of the present invention, the temperature range of the polytetrafluoroethylene-fluororubber composite sealing ring is compatible with the modified magnetic material, and it provides stable sealing under operating conditions of -30℃ to 450℃.

[0016] Thirdly, this application provides a mass flow control device based on modified magnetic valve material, which is applicable to a mass flow control system based on modified magnetic valve material. The flow adjustment range of the device is 0.05L / min to 60L / min, the magnetic performance decay rate is less than or equal to 5% / 1000h under the condition of -30℃ to 450℃, and the flow control accuracy is less than or equal to ±0.4%FS.

[0017] Compared with existing technologies, the mass flow control method, system, and equipment based on modified magnetic valve materials of the present invention have the following advantages: 1. Improved magnetic properties and response sensitivity: By modifying the magnetic valve material through doping with nano-magnetic particles, directional optimization of crystal structure, and surface magnetic property locking film, the magnetic permeability of the material is significantly improved, the hysteresis loss is reduced, the magnetic field response delay of the modified magnetic sheet is reduced, and the valve core movement response speed is improved compared with the traditional structure, effectively improving the accuracy of dynamic flow regulation.

[0018] 2. Enhanced high-temperature stability: The surface locking film and optimized crystal structure design of the modified magnetic material give it excellent antimagnetic attenuation performance in a wide temperature range of -30℃ to 450℃, effectively avoiding valve control failure caused by material demagnetization or magnetic property attenuation under high-temperature conditions, thus broadening the applicable operating conditions of the equipment.

[0019] 3. Optimized sealing and adaptability: By setting a polytetrafluoroethylene-fluororubber composite sealing ring that is compatible with the temperature range of the modified magnetic material, stable sealing is achieved under operating conditions of -30℃ to 450℃, avoiding the impact of fluid leakage on flow control accuracy; at the same time, the synergistic design of the modified material with the micro magnetic circuit structure and valve core structure further improves the overall adaptability and operational stability of the system.

[0020] 4. Expanding application scenarios and improving reliability: It is compatible with various fluid types such as highly corrosive chemical fluids. Combined with its excellent high-temperature stability and sealing performance, it significantly improves the operational reliability of the equipment under complex working conditions and can be widely used in hydraulic transmission, chemical transportation and other fields. Attached Figure Description

[0021] To better understand and implement this application, the technical solution is described in detail below with reference to the accompanying drawings.

[0022] Figure 1 A flowchart illustrating the steps of a mass flow control method based on modified magnetic valve material provided in this application embodiment; Figure 2 This is a schematic diagram of a mass flow control system based on modified magnetic valve material, provided as an embodiment of this application. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, exemplary embodiments will be described in detail below, examples of which are illustrated in the accompanying drawings. In the following description relating to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of methods and systems consistent with some aspects of this application as detailed in the appended claims.

[0024] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0025] The following detailed description of the specific implementation methods, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided in detail.

[0026] Please see Figure 1 This invention provides a mass flow control method based on modified magnetic valve material, specifically including the following steps: S101, the magnetostrictive actuator of the flow control valve is made of modified magnetic material. The preparation process of the modified magnetic material includes doping with nano-magnetic particles, directional optimization of crystal structure, or designing a stepped sealing structure on the valve sealing surface in combination with the characteristics of the modified magnetic material. S102, the modified magnetic sheet prepared by the modified magnetic material is glued to the metal sheet cantilever beam. The metal sheet cantilever beam is driven to bend by the expansion and contraction characteristics of the modified magnetic sheet under the action of the external coil magnetic field, thereby driving the cylindrical valve core to slide along the inner cavity of the hollow double frustum valve body. S103, combined with the flow signal fed back in real time by the flow detection module, adjust the input current parameter of the external coil to change the magnetic field strength, dynamically control the extension length of the modified magnetic sheet, and then adjust the movement of the cylindrical valve core to achieve precise control of the valve opening degree between the annular oil groove of the cylindrical valve core and the oil inlet and outlet of the hollow double-turret valve body. S104. For multi-fluid operating conditions, a fluid adaptability adjustment layer is added inside the modified magnetic valve to dynamically adjust the valve's magnetic control parameters according to the fluid properties, thereby maintaining the stability of the magnetic properties of the modified magnetic sheet under high-temperature conditions.

[0027] The steps S101 to S104 described above will be explained in detail below. Regarding step S101, the magnetostrictive actuator of the flow control valve is made of a modified magnetic material. The preparation process of the modified magnetic material includes doping with nano-magnetic particles, directional optimization of the crystal structure, or designing a stepped sealing structure on the valve sealing surface in combination with the characteristics of the modified magnetic material.

[0028] Preparation of modified magnetic materials: Select a magnetostrictive substrate such as Terfenol-D alloy substrate and modify it through at least one of the following methods: (1) Doping with nano-magnetic particles: Doping nano-samarium cobalt or nano-Fe3O4 particles into the substrate, with the doping mass ratio controlled at 2%-5%, and achieving uniform dispersion of particles through mechanical alloying process, thereby increasing the magnetic permeability of the material to over 1500H / m; (2) Oriented optimization of crystal structure: The doped substrate is treated by magnetic field assisted sintering process, the sintering temperature is controlled at 1100-1200℃, and an oriented magnetic field (magnetic field strength of 0.8-1.2T) is applied in the same direction as the magnetic field of the subsequent coil, so that the material grains are preferentially arranged along the magnetic field direction, reducing the hysteresis loss to below 0.015J / m³. (3) Surface magnetic properties locking film: Aluminum nitride-silicon oxide composite coating is prepared on the surface of the modified substrate by magnetron sputtering process. The film thickness is controlled between 1μm and 2.5μm to enhance the material's high-temperature antimagnetic attenuation ability and make the temperature drift coefficient ≤ ±0.2% / ℃.

[0029] Regarding step S102, the modified magnetic sheet prepared by the modified magnetic material is glued to the metal sheet cantilever beam. The expansion and contraction characteristics of the modified magnetic sheet under the action of the external coil magnetic field are used to drive the metal sheet cantilever beam to bend, thereby driving the cylindrical valve core to slide along the inner cavity of the hollow double frustum valve body.

[0030] The modified magnetic material is processed into a thin sheet structure (i.e., modified magnetic sheet), and then bonded to a metal sheet cantilever beam using a high-temperature resistant epoxy adhesive, ensuring an adhesion of ≥98%. Subsequently, the two ends of the metal sheet cantilever beam are glued and fixed to the cylindrical valve core and the fixed end of the cantilever beam, respectively. The fixed end of the cantilever beam is fastened to the right end of the hollow double frustum valve body with fastening screws. The cylindrical valve core slides in the cavity of the hollow double frustum valve body, and the left large end of the cylindrical valve core has a pre-set annular oil groove. The width of the annular oil groove matches the diameter of the oil inlet and outlet holes of the valve body.

[0031] Regarding step S103, based on the flow signal fed back in real time by the flow detection module, the input current parameter of the external coil is adjusted to change the magnetic field strength, dynamically controlling the extension length of the modified magnetic sheet, thereby adjusting the movement of the cylindrical valve core, and achieving precise control of the valve opening degree between the annular oil groove of the cylindrical valve core and the oil inlet and outlet of the hollow double-turret valve body.

[0032] A coil is mounted on the right small frustum of the hollow double-frustum valve body as a magnetic field driving component. A high-precision electromagnetic flowmeter with a flow detection module is installed near the valve port in the fluid delivery pipeline. During operation, the control unit adjusts the input current parameter of the coil according to the preset flow value and the real-time flow signal fed back by the flow detection module. The magnetic field strength generated by the coil is adjusted by adjusting the current adjustment range. The modified magnetic sheet expands and contracts under the action of the magnetic field, driving the metal sheet-like cantilever beam to bend, which in turn drives the cylindrical valve core to slide along the valve body axis, adjusting the degree of connection between the annular oil groove and the oil inlet and outlet (i.e., the valve opening degree), thereby achieving dynamic and precise flow regulation. At the same time, relying on the high-temperature antimagnetic attenuation characteristics of the modified magnetic material, the magnetic performance remains stable under operating conditions of -30℃ to 450℃, avoiding valve port control failure.

[0033] Regarding step S104, for multi-fluid conditions, a fluid adaptability adjustment layer is added inside the modified magnetic valve to dynamically adjust the valve's magnetic control parameters according to the fluid properties, thereby maintaining the stability of the magnetic properties of the modified magnetic sheet under high-temperature conditions.

[0034] Please see Figure 2 In a second aspect of the invention, a mass flow control system based on a modified magnetic valve material is also provided, comprising: A modified magnetic actuation module includes a modified magnetic sheet, a metal sheet cantilever beam, and a cylindrical valve core. The modified magnetic sheet is glued to the metal sheet cantilever beam. The two ends of the metal sheet cantilever beam are glued to the cylindrical valve core and the fixed end of the cantilever beam, respectively. The cylindrical valve core is provided with an annular oil groove that matches the oil inlet and oil outlet. The valve body mounting module includes a hollow double frustum valve body and a cantilever beam fixed end. The cantilever beam fixed end is fastened to the right end of the hollow double frustum valve body by fastening screws. The hollow double frustum valve body is provided with an oil inlet and an oil outlet, and slides with a cylindrical valve core. The magnetic field drive module includes a coil fitted into the right small frustum of the hollow double frustum valve body, which is used to output an adjustable magnetic field to drive the extension and retraction of the modified magnetic sheet. The flow detection feedback module is used to collect fluid flow signals in real time and feed them back to the control unit; The control unit is used to adjust the coil input current according to the flow feedback signal, dynamically control the extension length of the modified magnetic sheet, and thus regulate the valve opening degree to achieve precise flow control.

[0035] The coil of the magnetic field drive module is made of φ0.8mm high-strength copper enameled wire wound on a nylon skeleton with an inner diameter of φ25mm, an outer diameter of φ35mm, and a length of 40mm. The coil has 650 turns, and the wires are evenly arranged without overlap or crossing during the winding process. After winding, it is potted and cured with epoxy resin to enhance insulation and heat dissipation. The coil is fitted into the right small truncated cone of the hollow double-truncated cone valve body. The coaxiality between the coil and the valve body is ≤0.5mm, and it is fixed with buckles to ensure that there is no loosening during operation. The wires leading out from both ends of the coil are protected by high-temperature insulating sleeves. The connection with the magnetic field drive circuit is made by welding, and the solder joints are tin-plated.

[0036] The flow detection feedback module uses a high-precision electromagnetic flow meter installed in the pipeline 10cm downstream of the valve body's oil inlet. The flow meter is connected to the pipeline via a flange, with a metal spiral wound gasket on the flange sealing surface, and the installation coaxiality is ≤0.2mm. The flow meter's signal output is connected to the analog input interface of the control unit via a shielded cable, with the shielding layer grounded at one end to prevent electromagnetic interference.

[0037] The control unit uses an STM32F407 microcontroller, along with a power supply module and a current drive module. The control unit circuit board is made of FR-4 material, surface mount technology, and the solder joints are wave soldered. The microcontroller, current drive module, and power supply module are integrated into a metal casing, which is grounded and shielded. Debugging the control unit involves: first, performing a hardware self-test to check if the voltage and current at each interface are normal; then, debugging the PID control algorithm, with a preset proportional coefficient Kp=5.0, integral coefficient Ki=0.1, and derivative coefficient Kd=0.5. The algorithm is downloaded to the microcontroller using the KeiluVision5 host computer software, and a simulated flow signal input test is performed to ensure that the control unit can accurately output the corresponding current regulation signal.

[0038] The following is a complete workflow: After the control unit is powered on, it executes the initialization program and performs self-tests on each module: checking whether the coil drive circuit is normal, whether the flow detection module communicates normally, and whether the power supply voltage is stable; after the self-test passes, the control unit outputs an initialization signal, sets the coil current to zero, and resets the valve core to the initial position: the annular oil groove is completely offset from the oil inlet and outlet, and the valve port is closed.

[0039] The host computer software inputs preset parameters to the control unit: target flow rate 10L / min, allowable flow rate fluctuation range ±0.04L / min (corresponding to control accuracy ±0.4%FS), and operating temperature 400℃; the control unit calls the built-in temperature compensation coefficient to pre-compensate the subsequent current adjustment signal according to the preset temperature parameters.

[0040] Connect the mass flow control device to the hydraulic oil delivery pipeline with an inlet pressure of 0.5-2.0 MPa. The pipeline material is stainless steel, and flange connections are used. Apply high-temperature sealant to the sealing surfaces to ensure that the pipeline connection is leak-free. After installation, manually open the pipeline shut-off valve to allow hydraulic oil to enter the front end of the valve body. At this time, the valve core is in the closed state, and no oil flows through.

[0041] The control unit outputs an initial current control signal based on the preset flow rate value of 10L / min and the preset flow-current correspondence curve. After being amplified by the current drive module, the signal is sent to the coil. The coil generates an axial directional magnetic field under the action of the current. The magnetic field strength at the center of the coil is detected by a gaussmeter to be 0.6T. The direction of the magnetic field is consistent with the stretching direction of the modified magnetic sheet.

[0042] Under the action of a 0.6T magnetic field, the modified magnetic sheet undergoes expansion and contraction along the direction of the magnetic field, with an elongation of 0.12mm. Since the sheet is firmly bonded to the cantilever beam, the expansion and contraction force causes the metal sheet-like cantilever beam to bend in the direction of the magnetic field. During the bending process of the cantilever beam, it causes the cylindrical valve core to slide to the right along the valve body axis. The sliding displacement is detected by the laser displacement sensor as 0.5mm. At this time, the annular oil groove of the cylindrical valve core is connected to the oil inlet and oil outlet of the valve body, forming the initial valve port (valve port opening of 1mm). Hydraulic oil begins to enter the oil outlet pipeline through the valve port.

[0043] The electromagnetic flow meter in the flow detection module collects the actual flow signal of the oil pipeline in real time, converts the flow signal into a 4-20mA current signal, and transmits it to the analog input interface of the control unit. The control unit filters the input current signal to remove high-frequency interference, and then converts the filtered current signal into the actual flow value. The conversion formula is: flow rate L / min = signal current × 100 / 16.

[0044] The control unit compares the processed actual flow rate (8.5 L / min) with the preset flow rate (10 L / min) and calculates the flow deviation ΔQ = 1.5 L / min; then it executes the PID control algorithm to calculate the adjustment amount based on the deviation value. ΔI=K p ×ΔQ+K i ×∫ΔQdt+K d ×d(ΔQ) / dt, Where ΔI represents the adjustment amount, ΔQ represents the deviation value, which is the difference between the actual flow rate and the preset flow rate, and K... p K i and K dAll are weighting coefficients. Substituting the parameters, ΔI = 0.3A is calculated. The control unit superimposes the initial current of 1.5A with the adjustment amount of 0.3A, and outputs a new current control signal of 1.8A. After the 1.8A current signal is sent to the coil, the magnetic field strength generated by the coil increases to 0.72T, the elongation of the modified magnetic sheet increases to 0.18mm, the bending deflection of the cantilever beam increases to 0.45mm, the valve core slides further to the right by 0.3mm, the total sliding displacement is 0.8mm, and the valve opening increases to 1.6mm. At this time, the actual flow rate detected by the electromagnetic flowmeter increases to 10.0L / min, the flow deviation ΔQ = 0L / min, and the control unit maintains the current current output to achieve stable flow control.

[0045] If pipeline pressure fluctuations cause the actual flow rate to rise to 10.06 L / min, exceeding the allowable fluctuation range, the control unit detects a deviation ΔQ = 0.06 L / min, calculates an adjustment amount ΔI = -0.02 A using the PID algorithm, outputs a current signal of 1.78 A, reduces the coil magnetic field strength to 0.71 T, slides the valve core to the left by 0.05 mm, reduces the valve opening to 1.55 mm, and the actual flow rate returns to 9.98 L / min, remaining within the allowable fluctuation range.

[0046] During equipment operation, pressure sensors detect leakage at the sealing surface. No leakage is observed, the sealing ring surface shows no wear or deformation, and the sealing performance is stable.

[0047] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is merely an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above. The functional modules in the embodiments can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules can be implemented in hardware or as software functional modules. Furthermore, the specific names of the functional modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0048] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A mass flow control method based on modified magnetic valve material, characterized in that: Includes the following steps: The magnetostrictive actuator of the flow control valve is made of modified magnetic material. The preparation process of the modified magnetic material includes doping with nano-magnetic particles, directional optimization of crystal structure, or designing a stepped sealing structure on the valve sealing surface in combination with the characteristics of the modified magnetic material. The modified magnetic sheet prepared by the modified magnetic material is glued to the metal sheet cantilever beam. The expansion and contraction characteristics of the modified magnetic sheet under the action of the external coil magnetic field are used to drive the metal sheet cantilever beam to bend, thereby driving the cylindrical valve core to slide along the inner cavity of the hollow double frustum valve body. By combining the flow signal fed back in real time by the flow detection module, the input current parameter of the external coil is adjusted to change the magnetic field strength, dynamically controlling the extension length of the modified magnetic sheet, and then adjusting the movement of the cylindrical valve core, so as to achieve precise control of the valve opening degree between the annular oil groove of the cylindrical valve core and the oil inlet and outlet of the hollow double-turret valve body. For multi-fluid operating conditions, a fluid adaptability adjustment layer is added inside the modified magnetic valve to dynamically adjust the valve's magnetic control parameters according to the fluid properties, thereby maintaining the stability of the magnetic properties of the modified magnetic sheet under high-temperature conditions.

2. The mass flow control method based on modified magnetic valve material according to claim 1, characterized in that: The doped nanomagnetic particles are nano-samarium cobalt or nano-Fe3O4 particles, with a doping mass ratio of 2%-5%.

3. The mass flow control method based on modified magnetic valve material according to claim 1, characterized in that: The method for optimizing the crystal structure is a magnetic field-assisted sintering process, which causes the grains of the modified magnetic material to be oriented along the direction of the coil's magnetic field.

4. The mass flow control method based on modified magnetic valve material according to claim 1, characterized in that: The modified magnetic material bonded to the valve sealing surface is a surface magnetic performance locking film. The surface magnetic performance locking film is an aluminum nitride-silicon oxide composite coating with a film thickness controlled between 1μm and 2.5μm, so that the temperature drift coefficient of the modified magnetic material under the operating conditions of -30℃ to 450℃ is less than or equal to ±0.2% / ℃.

5. The mass flow control method based on modified magnetic valve material according to claim 1, characterized in that: The adjustment amount is calculated based on the deviation value using the PID control algorithm, where the deviation value is the difference between the actual flow rate and the preset flow rate.

6. The mass flow control method based on modified magnetic valve material according to claim 5, characterized in that: The method for calculating the adjustment amount is as follows: ΔI=K p ×ΔQ+K i ×∫ΔQdt+K d ×d(ΔQ) / dt, Where ΔI represents the adjustment amount, ΔQ represents the deviation value, which is the difference between the actual flow rate and the preset flow rate, and K... p K i and K d All are weighting coefficients.

7. A mass flow control system based on modified magnetic valve material, applicable to the mass flow control method based on modified magnetic valve material as described in any one of claims 1-6, characterized in that, include: A modified magnetic actuation module includes a modified magnetic sheet, a metal sheet cantilever beam, and a cylindrical valve core. The modified magnetic sheet is glued to the metal sheet cantilever beam. The two ends of the metal sheet cantilever beam are glued to the cylindrical valve core and the fixed end of the cantilever beam, respectively. The cylindrical valve core is provided with an annular oil groove that matches the oil inlet and oil outlet. The valve body mounting module includes a hollow double frustum valve body and a cantilever beam fixed end. The cantilever beam fixed end is fastened to the right end of the hollow double frustum valve body by fastening screws. The hollow double frustum valve body is provided with an oil inlet and an oil outlet, and slides with a cylindrical valve core. The magnetic field drive module includes a coil fitted into the right small frustum of the hollow double frustum valve body, which is used to output an adjustable magnetic field to drive the extension and retraction of the modified magnetic sheet. The flow detection feedback module is used to collect fluid flow signals in real time and feed them back to the control unit; The control unit is used to adjust the coil input current according to the flow feedback signal, dynamically control the extension length of the modified magnetic sheet, and thus regulate the valve opening degree to achieve precise flow control.

8. A mass flow control system based on modified magnetic valve material according to claim 7, characterized in that: The sliding fit between the hollow double-turbo valve body and the cylindrical valve core is provided with a polytetrafluoroethylene-fluororubber composite sealing ring.

9. A mass flow control system based on modified magnetic valve material according to claim 7, characterized in that: The temperature range of the polytetrafluoroethylene-fluororubber composite sealing ring is compatible with the modified magnetic material, and it provides a stable seal under operating conditions of -30℃ to 450℃.

10. A mass flow control device based on modified magnetic valve material, applicable to a mass flow control system based on modified magnetic valve material as described in any one of claims 7-9, wherein the flow adjustment range of the device is 0.05L / min to 60L / min, the magnetic performance decay rate is less than or equal to 5% / 1000h under operating conditions of -30℃ to 450℃, and the flow control accuracy is less than or equal to ±0.4%FS.

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