CN-121857823-B - Double-set-value sectional type pressure accurate control system

CN121857823BCN 121857823 BCN121857823 BCN 121857823BCN-121857823-B

Abstract

The invention discloses a double-set-value sectional type pressure accurate control system which comprises a ceramic diaphragm type structure, wherein pressure, speed and fluctuation data are continuously collected in a full range, an equal-proportion sensing spring and piston structure is adopted, transmission is free from hysteresis, signal isolation and closed-loop feedback are achieved, a double-set-value algorithm is built in, three pressure intervals are divided, accurate instructions are output, vibration interference is dynamically counteracted, control deviation is corrected, multipath switching signals are synchronized, running data are recorded, and history inquiry is supported. The invention realizes the precise control of the double-set-value sectional pressure, improves the control precision and the action stability, has excellent vibration resistance and weather resistance, runs stably in the whole life cycle, and can be widely adapted to the application requirements of industrial scenes in multiple fields.

Inventors

MA BIN
YANG XIAOMING
TANG SONG
CHEN KUI
QI GUANGLIANG

Assignees

江元(天长)科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260316

Claims (10)

1. The utility model provides a accurate control system of two setting value sectional type pressure which characterized in that includes: The multi-range pressure sensing acquisition module adopts a ceramic membrane type sensing structure to continuously acquire the real-time pressure data of a measured medium in a full range, synchronously captures the pressure change rate and fluctuation amplitude data, covers a positive and negative pressure full range interval in the acquisition process, and outputs a high-precision acquisition signal linearly corresponding to a pressure value; The mechanical transmission accurate execution module adopts an equal-proportion sensing spring and piston type force transmission structure, receives a regulation and control instruction to finish accurate transmission of mechanical displacement, synchronously drives an electric switch element to finish on-off action, and matches action response time with pressure change trend in real time; the signal isolation transmission and feedback module adopts a multi-stage electrical isolation structure to realize bidirectional isolation transmission of the acquisition signal and the control signal, and synchronously feeds back the action result and the real-time pressure data of the execution module to the control logic operation unit; The sectional control logic operation module is internally provided with a double-set value sectional control algorithm, three pressure control intervals are divided based on preset upper switching value and lower switching value double-set parameters, and logic operation is completed by combining real-time pressure data and change trend, so that an accurate regulation and control instruction of the corresponding interval is generated; The vibration-resistant structure adaptation and state compensation module is internally provided with a multidimensional vibration compensation algorithm, acquires vibration impact data of the environment where the system is located, dynamically compensates a control threshold value by combining vibration amplitude and frequency, and counteracts the interference of the vibration environment on the mechanical execution action; The set value self-adaptive calibration module is used for calculating set point deviation and repeatability error based on full-range acquisition data and action execution results, carrying out self-adaptive correction on the double set parameters by combining the metering calibration reference value, and eliminating control deviation caused by mechanical abrasion and environmental change; The multi-node linkage control output module synchronously outputs a plurality of paths of passive switch control signals, establishes communication connection with upstream and downstream industrial control equipment and synchronously transmits a pressure control state to the distributed control system; and the full-flow state monitoring and storing module is used for collecting pressure data, action times, set point deviation and environmental parameter full-dimensional operation data in the operation process of the system in real time, generating a continuous variation trend curve and completing local distributed storage and history backtracking inquiry of the data.
2. The dual-set-point segmented pressure precise control system of claim 1, further comprising a dual-set-point independent adjustment mechanical module, wherein the module adopts a split type adjustment bracket and independent adjustment screw structure, each set of set points corresponds to a set of independent transmission adjustment assemblies, the upper switching value and the lower switching value are respectively and precisely adjusted independently, the two sets of adjustment processes are not interfered with each other, and adjustment parameters are locked in real time in the adjustment process.
3. The dual-set-point sectional type pressure accurate control system according to claim 1, further comprising a high-low pressure environment compatible single-seal cavity module, wherein the module adopts an integrated single-cavity sealing structure, a positive-negative pressure dual-spring transmission assembly is arranged in the cavity, meanwhile, the positive-pressure and negative-pressure measurement control environment is adapted, an all-welded metal diaphragm sealing structure is adopted between the cavity and an external medium channel, the sealing process is free from leakage and deformation, overpressure impact in a rated range is born, meanwhile, the deformation of the diaphragm is controlled through a limiting structure in the cavity, and the service life of the sensing element is prolonged.
4. The dual-set-point sectional pressure accurate control system according to claim 1, wherein the sectional control logic operation module is internally provided with an interval dynamic deviation correction unit, and the dynamic correction coefficient of the dual set-point is generated through multi-dimensional parameter weighted calculation, and the calculation formula is Wherein the method comprises the steps of The dynamic correction coefficient is set for the double set values, As the weight coefficient of the actual measured value of the pressure, As a weight coefficient for the rate of change of pressure, Is an environmental temperature weight coefficient, and + + =1, As a real-time measurement of the pressure, For the corresponding set value of the current interval, For the rate of change of pressure in real time, For the maximum pressure change rate rated for the system, For the real-time ambient temperature, The ambient temperature is calibrated for the standard.
5. The dual-set-point segmented pressure precise control system according to claim 1, wherein the multi-range pressure sensing acquisition module further comprises a signal filtering and linearization processing unit, wherein the acquired original pressure signal is subjected to multi-level digital filtering processing, signal artifacts caused by environmental electromagnetic interference and mechanical vibration are removed, linearization correction is synchronously performed on nonlinear output signals of the sensing element, and the correction process is combined with full-range calibration data to complete multi-point fitting.
6. The dual-set-point segmented pressure precise control system of claim 1, wherein the mechanical transmission precise execution module further comprises an action contact synchronous calibration unit for performing flatness calibration on the action contact of the electric switch element, so that the force transmission structure is always in coplanar vertical contact with the contact, action deviation caused by contact eccentric wear is eliminated, and a three-stage buffering damping assembly is arranged in the transmission structure.
7. The dual-set-point segmented pressure precise control system according to claim 1, wherein the set-point adaptive calibration module is provided with a repetitive error dynamic optimization unit, and generates a repetitive compensation value through statistical calculation of continuous motion data, wherein the calculation formula is Wherein the method comprises the steps of In order for the error compensation value to be repeatable, For the number of continuous action tests, Is the first The measured pressure switch value of the secondary action, Is that The average value of the measured pressure switching values of the secondary actions, In order to compensate the coefficient, the repeated deviation of the system action is quantified through the statistical analysis of the continuous multiple action data, and the corresponding compensation value is generated to correct the set parameter.
8. The dual set point segmented pressure accurate control system of claim 1 wherein the anti-vibration structure adaptation and status compensation module further comprises a mechanical anti-vibration protection unit, a piston-micro motion composite anti-vibration structure is adopted, a nylon ball damping locking assembly is arranged in the force transmission path, multi-dimensional buffering is carried out on transverse and longitudinal vibration impact, a transverse locking mechanism is arranged in the set point adjusting structure, and the adjusting assembly is locked through lateral acting force.
9. The dual-set-point sectional type pressure precise control system according to claim 1, wherein the full-flow state monitoring and storage module further comprises an equipment health state assessment unit, wherein an equipment health state assessment model is constructed based on the action times of long-term operation of the system, the set-point deviation change trend and the repeated error change data, the abrasion degree of a mechanical structure and the performance attenuation condition of a sensing element are quantitatively assessed, potential equipment failure risks are identified in advance, maintenance reminding information is generated, multi-terminal synchronous pushing of operation data and failure information is supported, and the remote operation and maintenance requirements of an industrial site are adapted.
10. The dual-set-point sectional type pressure precise control system according to claim 1, further comprising a multi-protocol industrial communication adaptation module, wherein the multi-protocol industrial communication adaptation module supports a plurality of industrial field bus communication protocols, and is in seamless butt joint with a programmable logic controller, a distributed control system and a data acquisition and monitoring control system, so that remote setting of pressure control parameters, real-time uploading of running states and remote issuing of control instructions are realized, and meanwhile, encryption transmission and authority hierarchical management and control of communication data are supported.

Description

Double-set-value sectional type pressure accurate control system Technical Field The invention relates to the technical field of automatic control of industrial pressure, in particular to a double-set-value sectional type pressure accurate control system. Background In the whole industrial production process, accurate control of pressure parameters is a core link for guaranteeing production safety and stable operation of equipment, and in a plurality of industrial fields such as electric power environmental protection, petrochemical industry, rail transit, mechanical manufacturing and the like, a pressure control system is used as a key basic component, and the operation reliability and control precision of an industrial automation system are directly determined. Along with the continuous acceleration of industrial intelligentization and high-end transformation processes in China, the industrial site puts forward higher requirements on the refinement degree, working condition adaptation capability and long-term operation stability of pressure control, and the double-set-value sectional pressure control mode can realize the refinement division and hierarchical control of pressure intervals, so that the pressure chain protection and accurate pressure regulation ring-regulating node becomes a core application mode of industrial site pressure chain protection and accurate pressure regulation ring-regulating node, and the performance of the pressure chain protection and high-end pressure regulation ring-regulating node is directly related to the safety and efficiency of an industrial production process. At present, the pressure control system applied to the domestic high-end industrial scene mainly uses imported brand products, so that the purchasing and operation cost is high, the supply period is long, the product suitability is insufficient, the pressure control system is difficult to meet the requirements of diversified working conditions of the domestic industrial scene, the domestic brand products still have obvious short plates in the aspects of control precision, anti-interference capability, long-term operation stability and the like, and the application requirements of the high-end industrial scene cannot be completely met. The existing double-set-point pressure control system has a plurality of technical defects on mechanical structural design, most products adopt integrated adjusting structures, the adjusting processes of the double set points are mutually interfered, independent and accurate adjustment of the two set points cannot be realized, the adjusting processes are complicated, the precision is difficult to ensure, and the fine requirements of sectional pressure control cannot be met. The existing product has complex structural design and large overall volume, cannot adapt to the installation requirement of the limited space of the industrial field, has insufficient vibration-resistant structural design, and easily causes the problems of displacement of an adjusting screw and drift of a set value under the severe working conditions of continuous vibration and impact of the industrial field, thereby causing control action deviation and even causing potential safety hazards of equipment protection failure. Meanwhile, the sealing cavity of the existing product is imperfect in structural design, products with different structures are required for positive pressure working conditions and negative pressure working conditions, full-range compatibility of positive pressure and negative pressure cannot be achieved, the sealing structure is prone to the problems of medium leakage and insufficient pressure resistance, the sealing structure is limited in applicable scene, obvious potential safety hazards exist, mechanical abrasion is fast in long-term operation, the service life is short, and the use requirement of long-term continuous operation of an industrial site cannot be met. The existing pressure control system has obvious defects in the aspects of control logic and intelligent adaptation, most products can only realize the switching action of a fixed set value, cannot be dynamically compensated by combining with the real-time pressure change trend, the environment temperature and the on-site vibration working condition, and the control accuracy is easily reduced due to the change of the environment parameters, so that the stability of the control performance in the whole range is insufficient. The existing system lacks closed loop feedback and self-adaptive calibration capability, can not correct the set parameters according to mechanical abrasion and element aging conditions in the long-term operation process, and can not guarantee control precision in the whole life cycle because the repeatability error and the set point deviation are continuously enlarged along with the increase of the operation time. Meanwhile, the linkage adaptive capacity of the existing system, the industrial field distribu