CN103574127A - Micro differential pressure control based valve quick positioning system - Google Patents
Micro differential pressure control based valve quick positioning system Download PDFInfo
- Publication number
- CN103574127A CN103574127A CN201210256238.1A CN201210256238A CN103574127A CN 103574127 A CN103574127 A CN 103574127A CN 201210256238 A CN201210256238 A CN 201210256238A CN 103574127 A CN103574127 A CN 103574127A
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- China
- Prior art keywords
- valve
- differential pressure
- stepper motor
- control
- flap
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/046—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor with electric means, e.g. electric switches, to control the motor or to control a clutch between the valve and the motor
Abstract
The invention relates to a micro differential pressure control based valve quick positioning system. The system comprises a hardware control system of a micro differential pressure valve and a virtual instrument programming based software control system. The hardware system serves as the carrier and the execution part of virtual instrument software to complete differential pressure transducer data acquisition, stepper motor drive of valve moving and the like. The software system uses a virtual instrument programming mode for achieving differential pressure data acquisition, secondary acquisition processing of differential pressure data signals, loading and real-time calculation of a micro differential pressure quick positioning control model and driving of a stepper motor. By the coordination of the hardware system and the software system, automatic and quick positioning of the micro differential pressure valve is achieved.
Description
Technical field
What the present invention relates to is a kind of navigation system of technical field of valve control, specifically, is a kind of valve quick positioning system of controlling based on differential pressure.
Background technique
Differential pressure valve can form small pressure difference between between two spaces or space and the external world, can reach the object that prevents mutual cross pollution, therefore in fields such as food manufacturing, health care, Environmental Engineerings, is widely used.Differential pressure control valve is one of Main Means of realizing differential pressure control.The differential pressure control valve generally being used at present adopts the continuous opening/shutting mode of valve to control more, although can, controlling pressure reduction within the specific limits, exist the problems such as pressure surge is large, flap action is too frequent; External introduction or the domestic intelligent differential pressure control valve of development recently can solve the large problem of pressure surge preferably, the precision that pressure reduction is controlled is simultaneously also higher, but what all adopt due to its control system is ratio infinitesimal calculus regulating method, the method that flap approaches by to-and-fro motion positions, therefore inevitably can produce concussion to a certain degree, also make extend positioning time simultaneously.
Through prior art literature search is found, Chinese Patent Application No.: 200910265304.X, patent name is: utilize permagnetic synchronous motor to carry out device and its implementation of valve micro-step adjusting.Structure and the principle of the valve micro-step control gear providing according to this invention, paper a kind of framework and scheme that adopts dsp controller and permagnetic synchronous motor to carry out the control gear of valve micro-step adjusting.This device is the center as electric valve controller based on DSP, and the Motor execution that adopts function generator and high frequency power amplifier to realize permagnetic synchronous motor in structure is controlled; Adopt rotary transformer and quantizer to realize reading of angle of swing.Because the working control of differential pressure valve will be subject to the combined influence of the many factors such as medium, flow resistance, pressure, adopt the valve navigation system of DSP pattern to be difficult to set up complicated mathematical model and adapt to the comprehensive external condition that valve is used; What the orientation type of this device adopted is the pattern of rotary transformer and quantizer, is easily interfered, and positioning precision is not high; And it only adopts is that the micro-stepping of valve location regulates pattern, do not using the pressure reduction of valve as feedback element, because cannot reach the effect of differential pressure control.
Summary of the invention
The object of the invention is to overcome the deficiency of existing differential pressure valve navigation system, provide a kind of according to differential pressure requirement, can quick high accuracy the quick positioning control system of differential pressure valve of location.
For achieving the above object, the present invention takes following technological scheme:
The present invention includes: the hardware system of differential pressure valve and the software control system based on Virtual Instrument Program.Hardware system, as carrier and the power unit of virtual instrument software, completes the actions such as differential pressure pickup image data, the motion of stepper motor driven valve door.Software systems adopt the programming mode based on virtual instrument, for realizing the collection of pressure difference data, the double sampling of pressure difference data signal is processed, the loading of the quick positioning control model of differential pressure valve and calculating in real time and the driving of stepper motor.By the collaborative work of hardware system and software systems, realize automatically and fast locating of differential pressure valve.
The hardware system of described differential pressure valve mainly comprises computer, motion control and data collecting card, differential pressure pickup, stepper motor and driver, slide unit screw mechanism, approach switch, valve chamber and flap.Computer is connected with data collecting card with motion control by USB line; The pulse signal that the pulse delivery outlet of motion control and data collecting card is connected stepper motor driver drives port, and the digital output mouth of motion control and data collecting card is connected the direction driving port of stepper motor driver, can control start and stop and the rotation direction of stepper motor; The digital quantity inlet opening of motion control and data collecting card is connected approach switch, for receiving the clear point signal from approach switch; The analog quantity input of motion control and data collecting card is connected the signal input of differential pressure pickup, for receiving real-time pressure difference signal; Stepper motor driver connects stepper motor, realizes the operation of motor is driven; Differential pressure pickup connects gas circuit before outside valve, after valve, for measuring pressure difference data; Stepper motor is connected to slide unit screw mechanism one end, and the other end connects flap, and actuatable valve lobe carries out front and back action; Approach switch is arranged on slide unit screw mechanism near motor one end, for detection of slide unit screw mechanism, whether gets back to zero-bit; Flap is positioned at valve chamber, can the effective travel in valve chamber on before and after slide.
The described programming mode based on virtual instrument, refer to: adopt LabVlEW graphical programming language as programming tool, the quick positioning software control system of the differential pressure valve of structure based on virtual instrument, can Real-time Collection pressure difference data go forward side by side line number Data preprocess, and by built-in differential pressure valve Automatic Positioning Control model, realize flap fast, dead-beat locates.
The double sampling of described pressure difference data signal is processed and is referred to the pressure difference that reads in real time current flap left and right by software control system driving data capture card, and adopt self-defining double sampling arithmetic subroutine to carry out reprocessing, test data is carried out to equalization and tranquilization processing, eliminate drift and the temperature of pressure reduction test and float, and the error that causes of Removing Random No and System noise.
Described differential pressure valve Automatic Positioning Control model, its method is:
First, utilize the relation between valve opening, pressure reduction and flow, Automatic Positioning Control model automatically reads the pressure reduction of setting and controls setting value, and according to flap current location (or aperture) and pressure difference, by built-in mathematical model formula, calculate the valve target location that meets differential pressure requirement, and calculated value is kept in buffer memory;
Secondly, Automatic Positioning Control model calculates moving direction and the relative motion distance of flap automatically, and moves according to direction initialization and distance by motion control and data collecting card Driving Stepping Motor, and control valve rapid movement is to target location.
Finally, Automatic Positioning Control model, in controlling the movement process of flap, is continuing to read current flap aperture and pressure difference, and is revising operational objective position and direction, thereby reaching automatic regulating valve lobe position simultaneously, makes pressure reduction all-the-time stable in setting range.
The present invention is owing to taking above technological scheme, it has the following advantages: 1, control mode of the present invention be by flap from current location directly and movement at the uniform velocity to target location, (settle at one go), obviously shortened positioning time, thereby make location fast become possibility, improved the control accuracy of differential pressure; 2, the present invention is due to the relation (can obtain from valve detection test result) of utilizing between valve opening, pressure reduction and flow, calculate the valve target location that meets differential pressure requirement, the accuracy and the reliability that have guaranteed location, be also conducive to improve differential pressure control accuracy; 3, the present invention's flap in control procedure is unidirectional movement, has avoided the generation of reforming phenomena, has improved the Safety performance of valve body itself; 4, the present invention has good versatility and opening.Adjustment member parameter, can be used as the quick positioning system of flow control valve.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described.The present embodiment is implemented take invention technological scheme under prerequisite; detailed mode of execution and detailed process have been provided; the structure of each parts, setting position and connection thereof all can change to some extent; on the basis of technical solution of the present invention; all improvement of indivedual parts being carried out according to the principle of the invention and equivalents, all should not get rid of outside protection scope of the present invention.
The structure of differential pressure valve quick positioning system of the present invention as shown in Figure 1, comprising: valve chamber 1, flap 2, stepper motor 3, slide unit screw mechanism 4, approach switch 5, motion control and data collecting card 6, differential pressure pickup 7, software control system 8, observing and controlling Electric Appliance Cabinet 9, computer 10.
The specific implementation process of the present embodiment is as follows:
1. computer 10 is connected with data collecting card 6 with motion control by USB line; The stepper motor driver of motion control in being connected observing and controlling Electric Appliance Cabinet 9 with data collecting card 6, can control start and stop and the rotation direction of stepper motor 3; Approach switch 5 is linked in the digital quantity inlet opening of motion control and data collecting card 6, for receiving the clear point signal from approach switch 5; The analog quantity input of motion control and data collecting card 6 is connected differential pressure pickup 7, for receiving real-time pressure difference signal; Stepper motor driver in observing and controlling Electric Appliance Cabinet 9 connects stepper motor 3, realizes the operation of stepper motor 3 is driven; Differential pressure pickup 7 is connected to gas circuit before the valve on valve chamber 1, after valve, for measuring pressure difference data; Stepper motor 3 is connected to one end of slide unit screw mechanism 4, and the other end of slide unit screw mechanism 4 connects flap 2, and actuatable valve lobe 2 carries out front and back action; Approach switch 5 is arranged on slide unit screw mechanism 4 near a side of stepper motor 3, for detection of slide unit screw mechanism 4, whether gets back to zero-bit; Flap 2 is positioned at valve chamber 1, can be in valve chamber slides before and after in 1 effective travel; Software control system 8 is loaded on the platform of computer 10, and the position of differential pressure valve is positioned to control.
2. the step of the quick positioning control of differential pressure valve:
First, by software control system 8, set differential pressure valve front and back pressure difference and control accuracy.
Secondly, software control system 8 calling data collecting functions, read and calculate current differential pressure by differential pressure pickup 7, read the aperture size of the current flap 2 in computer 10 buffer memorys simultaneously;
Again, software control system 8 is called differential pressure valve Automatic Positioning Control model, calculates fast valve target location, then according to current aperture position, automatically calculates moving direction and the relative motion distance of flap 2;
Then, the stepper motor driver driving in observing and controlling Electric Appliance Cabinet 9 by motion control and data collecting card 6, drive stepper motor 3 to drive slide unit screw mechanism 4, drive flap 2 according to the direction of setting and distance motion rapidly, make flap 2 arrive fast specified position;
Finally, Automatic Positioning Control model is in controlling the movement process of flap 2, simultaneously at the aperture and the pressure difference that continue to read current flap 2, and revise operational objective position and direction, thereby reach automatic regulating valve lobe 2 positions, make pressure reduction all-the-time stable in setting range, realize the quick positioning control of differential pressure valve.
Claims (3)
1. a valve quick positioning system of controlling based on differential pressure, comprises hardware system and the software control system based on Virtual Instrument Program of differential pressure valve; Hardware system, as carrier and the power unit of virtual instrument software, completes the actions such as differential pressure pickup image data, the motion of stepper motor driven valve door; Software control system adopts the programming mode based on virtual instrument, for realizing the collection of pressure difference data, the double sampling of pressure difference data signal is processed, the loading of the quick positioning control model of differential pressure valve and calculating in real time and the driving of stepper motor; By the collaborative work of hardware system and software control system, realize automatically and fast locating of differential pressure valve;
The hardware system that it is characterized in that described differential pressure valve mainly comprises computer, motion control and data collecting card, differential pressure pickup, stepper motor and driver, slide unit screw mechanism, approach switch, valve chamber and flap; Computer is connected with data collecting card with motion control by USB line; The pulse signal that the pulse delivery outlet of motion control and data collecting card is connected stepper motor driver drives port, and the digital output mouth of motion control and data collecting card is connected the direction driving port of stepper motor driver, can control start and stop and the rotation direction of stepper motor; The digital quantity inlet opening of motion control and data collecting card is connected approach switch, for receiving the clear point signal from approach switch; The analog quantity input of motion control and data collecting card is connected the signal input of differential pressure pickup, for receiving real-time pressure difference signal; Stepper motor driver connects stepper motor, realizes the operation of motor is driven; Differential pressure pickup connects gas circuit before outside valve, after valve, for measuring pressure difference data; Stepper motor is connected to slide unit screw mechanism one end, and the other end connects flap, and actuatable valve lobe carries out front and back action; Approach switch is arranged on slide unit screw mechanism near motor one end, for detection of slide unit screw mechanism, whether gets back to zero-bit; Flap is positioned at valve chamber, can the effective travel in valve chamber on before and after slide.
2. the valve quick positioning system of controlling based on differential pressure according to claim 1, the double sampling processing that it is characterized in that described pressure difference data signal refers to the pressure difference that reads in real time current flap left and right by software control system driving data capture card, and adopt self-defining double sampling arithmetic subroutine to carry out reprocessing, test data is carried out to equalization and tranquilization processing, eliminate drift and the temperature of pressure reduction test and float, and the error that causes of Removing Random No and System noise.
3. the valve fast positioning model of controlling based on differential pressure according to claim 1, it is characterized in that described differential pressure valve Automatic Positioning Control model is the relation of utilizing between valve opening, pressure reduction and flow, automatically read the pressure reduction of setting and control setting value, and according to flap current location (or aperture) and pressure difference, by built-in mathematical model formula, calculate the valve target location that meets differential pressure requirement, and calculated value is kept in buffer memory; Secondly, Automatic Positioning Control model calculates moving direction and the relative motion distance of flap automatically, and moves according to direction initialization and distance by motion control and data collecting card Driving Stepping Motor, and control valve rapid movement is to target location; Finally, Automatic Positioning Control model, in controlling the movement process of flap, is continuing to read current flap aperture and pressure difference, and is revising operational objective position and direction simultaneously, thereby reach automatic regulating valve lobe position, make pressure reduction all-the-time stable within the scope of the threshold pressure differential of initial setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210256238.1A CN103574127A (en) | 2012-07-20 | 2012-07-20 | Micro differential pressure control based valve quick positioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210256238.1A CN103574127A (en) | 2012-07-20 | 2012-07-20 | Micro differential pressure control based valve quick positioning system |
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| CN103574127A true CN103574127A (en) | 2014-02-12 |
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| CN201210256238.1A Pending CN103574127A (en) | 2012-07-20 | 2012-07-20 | Micro differential pressure control based valve quick positioning system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112581850A (en) * | 2019-09-27 | 2021-03-30 | 李晓华 | Virtual debugging system of multifunctional production line and equipment |
| CN114323435A (en) * | 2021-12-13 | 2022-04-12 | 潍柴动力股份有限公司 | Differential pressure sensor credibility detection method and device, electronic equipment and storage medium |
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2012
- 2012-07-20 CN CN201210256238.1A patent/CN103574127A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112581850A (en) * | 2019-09-27 | 2021-03-30 | 李晓华 | Virtual debugging system of multifunctional production line and equipment |
| CN114323435A (en) * | 2021-12-13 | 2022-04-12 | 潍柴动力股份有限公司 | Differential pressure sensor credibility detection method and device, electronic equipment and storage medium |
| CN114323435B (en) * | 2021-12-13 | 2023-10-20 | 潍柴动力股份有限公司 | Differential pressure sensor credibility detection method and device, electronic equipment and storage medium |
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Application publication date: 20140212 |