CN-121979303-A - Mass flow control method, system and equipment based on modified magnetic induction valve material

CN121979303ACN 121979303 ACN121979303 ACN 121979303ACN-121979303-A

Abstract

The invention discloses a mass flow control method, a 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 consisting of a cavity double-truncated cone valve body, a cylindrical valve core and the like, the magnetostrictive actuator material is modified in a mode of doping nano magnetic particles, directionally optimizing a crystal structure, locking a film on the surface magnetic property and the like, the magnetic field expansion characteristic of a modified magnetic induction sheet is utilized to drive the cantilever beam to bend and the valve core to slide, and the coil current is dynamically regulated by combining a flow detection feedback signal so as to regulate and control the opening and closing 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 invention obviously improves the magnetic conductivity, response sensitivity and high-temperature stability of the magnetic induction material, reduces hysteresis loss and temperature drift, combines proper sealing structure design, effectively improves flow control precision and operation reliability, and widens the applicable working condition range.

Inventors

LI NA
ZHANG BIN
CHEN XINZHUN
CHEN WEIQUAN

Assignees

广州奥松电子股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260130

Claims (10)

1.A mass flow control method based on a modified magnetic induction valve material is characterized by comprising the following steps: the magnetostrictive actuating part of the flow control valve is prepared by adopting a modified magnetic induction material, and the preparation process of the modified magnetic induction material comprises the steps of doping nano magnetic particles, directionally optimizing a crystal structure or designing a stepped sealing structure by combining the characteristics of the modified magnetic induction material on a sealing surface of the valve; The modified magnetic induction sheet prepared by the modified magnetic induction material is connected to the metal sheet-shaped cantilever beam in an adhesive manner, and the metal sheet-shaped cantilever beam is driven to bend by utilizing the expansion characteristic of the modified magnetic induction sheet under the action of an external coil magnetic field, so that the cylindrical valve core is driven to slide along the inner cavity of the cavity double-truncated cone valve body; The input current parameters of the external coil are regulated by combining the flow signals fed back by the flow detection module in real time to change the magnetic field intensity, the elongation of the modified magnetic induction sheet is dynamically controlled, and the movement amount of the cylindrical valve core is regulated, so that the accurate regulation and control of the opening and closing degree of the valve port between the annular oil groove of the cylindrical valve core and the oil inlet and the oil outlet of the cavity double-truncated cone valve body is realized; Aiming at the multi-fluid working condition, a fluid adaptability adjusting layer is additionally arranged in the modified magnetic induction valve, the magnetic control parameters of the valve are dynamically adjusted according to the fluid property, and the magnetic performance of the modified magnetic induction sheet is maintained stable under the high-temperature working condition.
2. The method for controlling mass flow based on the modified magnetic induction valve material as claimed in claim 1, wherein the doped nano magnetic particles are samarium cobalt nano particles or Fe 3 O 4 nano particles, and the doping mass ratio is 2% -5%.
3. The method for controlling mass flow rate based on modified magnetically susceptible valve material as claimed in claim 1, wherein the crystal structure is optimized in a magnetic field assisted sintering process, so that grains of the modified magnetically susceptible material are aligned along the acting direction of the magnetic field of the coil.
4. The mass flow control method based on the modified magnetic induction valve material according to claim 1, wherein the combination of the modified magnetic induction material on the valve sealing surface is a surface magnetic property locking film, the surface magnetic property locking film is an aluminum nitride-silicon oxide composite coating film, and the film thickness is controlled to be 1-2.5 μm, so that the temperature drift coefficient of the modified magnetic induction material under the working condition of-30-450 ℃ is less than or equal to +/-0.2%/DEGC.
5. The method for controlling mass flow of a modified magnetically induced valve material according to claim 1, wherein the adjustment is calculated according to a deviation value by a PID adjustment algorithm, wherein the deviation value is a difference between an actual flow value and a preset flow value.
6. The method for controlling mass flow rate based on modified magnetically induced valve material according to claim 5, wherein the adjustment amount is calculated as follows: ΔI=K p ×ΔQ+K i ×∫ΔQdt+K d ×d(ΔQ)/dt, Wherein Δi represents the adjustment amount, Δq represents the deviation value, which is the difference between the actual flow value and the preset flow value, and K p 、K i and K d are both weight coefficients.
7. A mass flow control system based on a modified magnetically susceptible valve material, adapted for use in a mass flow control method based on a modified magnetically susceptible valve material as claimed in any one of claims 1 to 6, comprising: The modified magnetic induction executing module comprises a modified magnetic induction sheet, a metal lamellar cantilever beam and a cylindrical valve core, wherein the modified magnetic induction sheet is glued on the metal lamellar cantilever beam, two ends of the metal lamellar cantilever beam are respectively glued with the cylindrical valve core and the cantilever beam fixed end, and the cylindrical valve core is provided with an annular oil groove matched with the oil inlet hole and the oil outlet hole; The valve body mounting module comprises a cavity double-truncated-cone-shaped valve body and a cantilever beam fixed end, wherein the cantilever beam fixed end is tightly fixed at the right end of the cavity double-truncated-cone-shaped valve body through a fastening screw, and the cavity double-truncated-cone-shaped valve body is provided with an oil inlet hole and an oil outlet hole and is in sliding fit with the cylindrical valve core; The magnetic field driving module comprises a coil sleeved on the right small round table of the cavity double round table type valve body and is used for outputting an adjustable magnetic field to drive the modified magnetic induction sheet to stretch; The flow detection feedback module is used for collecting the fluid flow signal in real time and feeding back the fluid flow signal to the control unit; And the control unit is used for adjusting the input current of the coil according to the flow feedback signal, dynamically controlling the elongation of the modified magnetic induction sheet, and further regulating and controlling the opening and closing degree of the valve port so as to realize accurate flow control.
8. The mass flow control system based on the modified magnetic induction valve material of claim 7, wherein the sliding fit position of the cavity double-truncated cone valve body and the cylindrical valve core is provided with a polytetrafluoroethylene-fluororubber composite sealing ring.
9. The mass flow control system based on the modified magnetic induction valve material of claim 7, wherein the temperature resistant range of the polytetrafluoroethylene-fluororubber composite sealing ring is matched with the modified magnetic induction material, and the sealing is stable under the working condition of-30 ℃ to 450 ℃.
10. A mass flow control device based on a modified magnetically induced valve material, which is suitable for a mass flow control system based on a modified magnetically induced valve material as claimed in any one of claims 7-9, wherein the flow regulation range of the device is 0.05L/min-60L/min, the magnetic property attenuation rate is less than or equal to 5%/1000h under the working condition of-30 ℃ to 450 ℃, and the flow control precision is less than or equal to +/-0.4%fs.

Description

Mass flow control method, system and equipment based on modified magnetic induction valve material Technical Field The invention relates to the technical field of flow control, in particular to a mass flow control method, a system and equipment based on a modified magnetic valve material. Background The fluid flow control device is used as core equipment for automatic adjustment of G05B class (general control or adjustment system), and the flow control valve is a core component for realizing accurate flow regulation in the fluid delivery system. The magnetostrictive driving type flow control valve has the advantages of high response speed and compact structure, and is widely applied to the fields of hydraulic transmission, chemical transportation and the like. The existing magnetostrictive flow control valve mostly adopts the traditional magnetostrictive material to prepare an executing part, such as a magnetostrictive cantilever beam driven flow control valve disclosed in patent publication No. CN105605010A, which drives a valve core to move through the telescopic characteristic of a magnetostrictive thin sheet under the action of a magnetic field, so as to realize flow regulation. However, in practical application, the traditional magnetostrictive material has obvious defects that on one hand, the magnetic permeability is lower, the response sensitivity of a magnetic field is insufficient, the movement response delay of a valve core is larger, the dynamic flow regulation precision is difficult to meet the requirement of a high-precision working condition, on the other hand, the hysteresis loss is higher, the magnetic property is easy to decay or even demagnetize under the high-temperature working condition, the valve port control is invalid, meanwhile, the temperature drift phenomenon is obvious, and the stability of flow control is further influenced. In addition, the sealing structure of the traditional flow control valve is poor in adaptability with the magnetostrictive material, and the problems of sealing failure, fluid leakage and the like are easy to occur under the high-temperature working condition, so that the flow control precision is further reduced. In view of the foregoing deficiencies in the prior art, a flow control solution is needed that can improve magnetic stability, response sensitivity and high temperature suitability. Disclosure of Invention The invention aims to provide a mass flow control method, a system and equipment based on a modified magnetically induced valve material, and aims to solve the technical problems that in the existing magnetostrictive flow control valve (such as a structure disclosed in a CN105605010A patent), the traditional magnetostrictive material has low magnetic conductivity, insufficient response sensitivity, easy attenuation of magnetic performance at high temperature and remarkable temperature drift, and the sealing structure and the material have poor adaptability, so that the flow control precision is low and the working condition adaptation range is narrow. The aim of the invention can be achieved by the following technical scheme: In a first aspect, an embodiment of the present application provides a mass flow control method based on a modified magnetically susceptible valve material, including the steps of: the magnetostrictive actuating part of the flow control valve is prepared by adopting a modified magnetic induction material, and the preparation process of the modified magnetic induction material comprises the steps of doping nano magnetic particles, directionally optimizing a crystal structure or designing a stepped sealing structure by combining the characteristics of the modified magnetic induction material on a sealing surface of the valve; The modified magnetic induction sheet prepared by the modified magnetic induction material is connected to the metal sheet-shaped cantilever beam in an adhesive manner, and the metal sheet-shaped cantilever beam is driven to bend by utilizing the expansion characteristic of the modified magnetic induction sheet under the action of an external coil magnetic field, so that the cylindrical valve core is driven to slide along the inner cavity of the cavity double-truncated cone valve body; The input current parameters of the external coil are regulated by combining the flow signals fed back by the flow detection module in real time to change the magnetic field intensity, the elongation of the modified magnetic induction sheet is dynamically controlled, and the movement amount of the cylindrical valve core is regulated, so that the accurate regulation and control of the opening and closing degree of the valve port between the annular oil groove of the cylindrical valve core and the oil inlet and the oil outlet of the cavity double-truncated cone valve body is realized; Aiming at the multi-fluid working condition, a fluid adaptability adjusting layer is additionally arranged in the modified magnetic induction