CN2250535Y - Electronic positioner for electric valve - Google Patents
Electronic positioner for electric valve Download PDFInfo
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- CN2250535Y CN2250535Y CN95232697U CN95232697U CN2250535Y CN 2250535 Y CN2250535 Y CN 2250535Y CN 95232697 U CN95232697 U CN 95232697U CN 95232697 U CN95232697 U CN 95232697U CN 2250535 Y CN2250535 Y CN 2250535Y
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The utility model relates to an electronic positioner for electric valves, belonging to the automatic controlling fields, such as the simulation electronic technology, and the digital electronic technology. The electronic positioner for electric valves can accurately control the opening position of adjusting valves. The reciprocating action of a valve rod is converted into feedback signal through a feedback circuit. The feedback signal and voltage controlling signal coming from a sampling circuit are all together sent to a control circuit, and the data comparison processing operation is carried out. And then an electropneumatic converter is used to control air source which enter an adjusting valve membrane chamber, so the goal to accurately control the opening of the adjusting valve is achieved. The electronic positioner for electric valves has the advantages of accurate controlling precision, high reliability, good stability, etc. The electronic positioner for electric valves can be used for petroleum departments, chemical industrial departments, metallurgy industrial departments, light industrial departments, etc.
Description
The utility model belongs in the automation fields such as Analog Electronics Technique and Digital Electronic Technique, accurately the electronic type electropneumatic valve positioner used of regulating and controlling valve opening position.
The electropneumatic valve positioner that domestic production is at present sold, the overwhelming majority belongs to engineering goods, its primary structure principle is: when torque-motor passes to Control current, the pressure of the armature of torque-motor by baffle controls throttle nozzle source of the gas, this source of the gas mainly are the control air capacities that flow into the cylinder pressure chamber.Simultaneously, the position signalling that piston feeds back changes feedback spring by mechanical parts such as cams tension force balances each other with the attractive force of the armature of torque-motor, has reached the purpose of controlling stem position.Main deficiency is that every performance index are not high, reliability is low, less stable.Also have the only a few product to contain electronic control part, but need connect power lead in addition, this accepts than difficult in inflammable and explosive place.
The purpose of this utility model is, a kind of electronic type electropneumatic valve positioner is provided, and it has following characteristics: positioning function is by electronic circuit control, and its every performance index all are higher than the traditional mechanical formula; Have only two signal wire inputs (non-transformer line), be applicable to inflammable and explosive place use.Its reliability and stability improve a lot than traditional mechanical type.
The utility model is realized by following measure, now narrated referring to accompanying drawing 2 block diagram of the present utility model: the M point is the electric signal inlet, connect the positive pole of signal source, with get can circuit (1) be connected, can circuit after (1) come out from getting, enter sample circuit (2), after sample circuit (2) comes out, connect electric signal outlet N, the i.e. negative pole of signal source.This device has only two lines to meet M and N enters native system.The control voltage signal A of sample circuit (2) output send subtracter 1 (5) and subtracter 2 (6) simultaneously.Feedback potentiometer in valve rod (3) the drive feedback circuit (4), the feedback signal B of feedback circuit (4) output send subtracter 1 (5) and subtracter 2 (6) respectively; The output of subtracter 1 connects comparer 1 (10) and voltage changer 1 (8) respectively, and the output of voltage changer 1 (8) connects voltage controlled oscillator 1 (9), and the output of voltage controlled oscillator 1 (9) connects electronic switch 1 (12); The output of comparer 1 (10) connects shaping circuit 1 (11), and the output of shaping circuit 1 (11) connects electronic switch 1 (12) as control signal, and the output of electronic switch 1 (12) connects counter (18) as adding count signal.The output of subtracter 2 (6) connects comparer 2 (13) and voltage changer 2 (15) respectively, and the output of voltage changer 2 (15) connects voltage controlled oscillator 2 (16), and the output of voltage controlled oscillator 2 (16) connects electronic switch 2 (17); The output of comparer 2 (13) connects shaping circuit 2 (14), and the output of shaping circuit 2 (14) connects electronic switch 2 (17) as control signal, and the output of electronic switch 2 (17) connects counter (18) as subtracting count signal.The output of counter (18) connects digital to analog converter (19), and the output of digital to analog converter (19) connects current driver (20), and the output of current driver (20) connects electropneumatic transducer (E/P) (21).This electropneumatic transducer belongs to prior art, and integral body is brought and is used for herein.Under the effect of current driver (20), control E/P (21) changes the air demand of source of the gas (22) to variable valve film chamber (23), thereby reaches the purpose of regulating and controlling valve valve head and valve rod (3).
Can circuit (1) after coming in from the M point from 4 ￣ 20mA control signals of central control room to getting, take out the required work energy of whole circuit, enter sample circuit (2) then and take out control voltage signal A in the signal, again from this device of N point outflow.The pinion and rack drive feedback potentiometer of valve rod on the valve (3) on this device, feedback signal enters feedback circuit (4), obtains feedback signal B.A, B signal are sent into subtracter 1 (5) and subtracter 2 (6) respectively simultaneously.When A＞B is a valve when not putting in place, subtracter 1 (5) action, subtract difference send comparer 1 (10) and benchmark (7) relatively, result relatively becomes logic level through shaping circuit 1 (11) shaping and is used to control electronic switch 1 (12) and connects; The output of subtracter 1 (5) simultaneously enters the big or small starting of oscillation of voltage controlled oscillator 1 (9) with voltage through voltage changer 1 (8) conversion again, oscillator signal enters counter (18) through electronic switch 1 (12) and adds counting, enter digital to analog converter (19) again and become analog quantity (voltage), this aanalogvoltage increases electric current through current driver (20) to electropneumatic transducer (E/P) (21), then E/P strengthens air demand to variable valve film chamber, make the action of valve head valve rod, valve rod feeds back to feedback potentiometer with action again, when A=B, valve rod is stabilized in a given position, and at this moment entire circuit stops.When B＞A is that valve is when crossing, in like manner.Subtracter 2 (6) actions this moment, be attached thereto a series of circuit workings that connect, counter (18) subtracts counting, advance electropneumatic transducer (21) through digital to analog converter (19), current driver (20) and subtract electric current, when forcing new B=A to set up, circuit enters static, and valve is positioned on the new position.By such scheme, realized making variable valve reach the purpose of accurate adjusting with electronic circuit by-pass valve control steady arm.
Below in conjunction with a description of drawings embodiment of the present utility model.
Accompanying drawing 2 is a circuit block diagram of the present utility model.
Accompanying drawing 4 is the pin synoptic diagram of integrated package MAX418.
Among Fig. 2 get can circuit (1) in Fig. 3 by being the positive supply circuit of core with IC1 and being that the negative supply circuit of core is formed with IC2.IC1 and L1, C1, C2, D2 form the positive supply circuit, and IC2 and C3, C4, L2, D3 form the negative supply circuit.On signal input line M, be connected to the negative pole of stabilivolt D1, the plus earth of D1.
Sample circuit among Fig. 2 (2) in Fig. 3 by operational amplifier A 10, R68, R69, and R70 form, A10, R68 and R69 form inverting amplifier, R70 is a sample resistance, one end ground connection, and the other end is connected with the input resistance R69 of output line N and A10 simultaneously.
Feedback circuit among Fig. 2 (4) is made up of feedback potentiometer W1, operational amplifier A 1 ￣ A5, resistance R 1 ￣ R15 and IC8.R1 and IC8 form the fundamental voltage source.A1 and R2, R3 constitute in-phase amplifier; A2 and R4, R5 form inverting amplifier; A3 and R7, R8, R9 form inverting amplifier; A4 and R10, R11, R12 form inverting amplifier; A5 and R13, R14, R15 form totalizer.The upper end of the output termination potentiometer W1 of the in-phase amplifier that A1 forms; The output terminal of the inverting amplifier that A2 forms connects the lower end of potentiometer W1 through adjustable resistance R6; The movable contact of potentiometer W1 meets the input resistance R7 of A3 inverting amplifier.The output of A5 is the output of whole feedback circuit.The output of A4 and the output of A3 meet with A5 two the input resistance R13 and the R14 of the totalizer that is core respectively.The junction of IC8 and R1 is as the input of A1, A2 and A4.
Subtracter 1 (5) among Fig. 2 is made up of operational amplifier A 6 and resistance R 16 to R19, and its negative input end connects the output of operational amplifier A 5, the output of its positive input termination operational amplifier A 10.
Subtracter 2 (6) among Fig. 2 is made up of operational amplifier A 7 and resistance R 20 to R23, the output of its positive input termination operational amplifier A 5, and its negative input end connects the output of operational amplifier A 10.
Benchmark among Fig. 2 (7) is made up of resistance R 24, R25 dividing potential drop, and R24, R25 junction connect the negative input end of operational amplifier A 8 and A9.
Voltage changer 1 (8) among Fig. 2 is made up of transistor V1, resistance R 26, R27, R28, and its input connects operational amplifier A 6 through resistance R 27, and its output is connect 9 pin of IC3 by emitter.
Voltage controlled oscillator 1 (9) among Fig. 2 is made up of IC3, C7, R71, and 9 pin of IC3 are input end, and its output is the emitter that is met V3 by 4 pin of IC3.
Comparer 1 (10) among Fig. 2 is made up of A8 and D4, and its positive input connects the output of A6, and its negative input meets R24, R25, and its output meets F1 by D4.
Shaping circuit 1 (11) among Fig. 2 is made up of Schmidt's (anti-phase) trigger F1, F2, resistance R 29, R30, capacitor C 5, and the input end of F1 is its input, and the output terminal of F2 is its output, and its input connects the D4 negative pole, and output meets R31.
Electronic switch 1 (12) among Fig. 2 is made up of V3, R31, and the emission of V3 is input end very, connects 4 pin of IC3, and the current collection of V3 is output terminal very.
Comparer 2 (13) among Fig. 2 is made up of A9 and D5, the output of its positive input termination A7, and its negative input end connecting resistance R24, R25, its output connects the input end of F3 through D5.
Shaping circuit 2 (14) among Fig. 2 is made up of Schmidt's (anti-phase) trigger F3, F4, resistance R 32, R33, capacitor C 6, and the input end of F3 is its input, and the output terminal of F4 is its output, and its input connects the negative pole of D5, and its output meets R34.
Electronic switch 2 (17) among Fig. 2 is made up of V4, R34, and the emission of V4 is very imported, and connects 4 pin of IC4, and the current collection of V4 is output terminal very.
Voltage changer 2 (15) among Fig. 2 is made up of V2, R35, R36, R37, and R35 connects the output of A7 for its input resistance, and 9 pin that meet IC4 are very exported in the emission of V2.
Voltage controlled oscillator 2 (16) among Fig. 2 is made up of IC4, C8 and R38, and 9 pin of IC4 are input end, and 4 pin of IC4 are the emitter of output termination V4.
Counter among Fig. 2 (18) is made up of IC5, IC6,1C7 and resistance R 39, R40, R41, and its input end is 4,5 pin of IC5, and 4 pin of IC5 connect and draw resistance R 40, connect the collector of V4 simultaneously, and 5 pin of IC5 connect and draw resistance R 39, connect the collector of V3 simultaneously.Three IC cascades are used, and it is output as 3,2,6,7 pin of each IC.
Digital to analog converter among Fig. 2 (19) by resistance R 42 to R66 totally 25 resistance and V5 to V16 totally 12 transistors form.R42 to R53 is an input resistance, connects 3,2,6,7 pin of IC5, IC6, IC7 respectively; R54 to R65 is an emitter resistance; The upper end of R66 is the output terminal of digital to analog converter (19).
Current driver among Fig. 2 (20) is made up of operational amplifier A 11, transistor V17, resistance R 67.The output terminal of the positive input termination digital to analog converter (19) of operational amplifier A 11, i.e. the upper end of R66, the A11 positive input terminal also is the input end of current driver (20).The base stage of the output termination V17 of A11.In fact A11, V17, R67 are a controllable current source, and it is output as the collector of V17, and this output meets electropneumatic transducer E/P, another termination Vcc of E/P.
The utility model has the advantages that and adopt the electronic circuit control positioning function, every performance index all are higher than the traditional mechanical formula as reliability, stability etc.; Have only two signal wire inputs, the non-transformer line helps the use of inflammable and explosive occasion.But industrial sectors such as widespread use oil, chemical industry, metallurgy, light industry.
Claims (4)
1. electronic type electropneumatic valve positioner, form by sample circuit, feedback circuit, data comparison control circuit and actuating unit etc., it is characterized in that: the M point that connects the signal source positive pole is the inlet of electric signal, with get can circuit (1) be connected, can circuit after (1) come out from getting, enter sample circuit (2), after sample circuit (2) comes out, connect electric signal outlet N, the i.e. negative pole of signal source; The control voltage signal A of sample circuit (2) output send subtracter 1 (5) and subtracter 2 (6) simultaneously; Feedback potentiometer in valve rod (3) the drive feedback circuit (4); The feedback signal B of feedback circuit (4) output send subtracter 1 (5) and subtracter 2 (6) respectively; The output of subtracter 1 connects comparer 1 (10) and voltage changer 1 (8) respectively, and the output of voltage changer 1 (8) connects voltage controlled oscillator 1 (9), and the output of voltage controlled oscillator 1 (9) connects electronic switch 1 (12); The output of comparer 1 (10) connects shaping circuit 1 (11), and the output of shaping circuit 1 (11) connects electronic switch 1 (12) as control signal, and the output of electronic switch 1 (12) connects counter (18) as adding count signal; The output of subtracter 2 (6) connects comparer 2 (13) and voltage changer 2 (15) respectively, and the output of voltage changer 2 (15) connects voltage controlled oscillator 2 (16), and the output of voltage controlled oscillator 2 (16) connects electronic switch 2 (17); The output of comparer 2 (13) connects shaping circuit 2 (14), and the output of shaping circuit 2 (14) connects electronic switch 2 (17) as control signal, and the output of electronic switch 2 (17) connects counter (18) as subtracting count signal; The output of counter (18) connects digital to analog converter (19), and the output of digital to analog converter (19) connects current driver (20), and the output of current driver (20) connects electropneumatic transducer (E/P) (21).
2. electronic type electropneumatic valve positioner according to claim 1 is characterized in that: be connected to stabilivolt D1 on signal input line, the negative pole of stabilivolt D1 connects M point, plus earth.
3. electronic type electropneumatic valve positioner according to claim 1 is characterized in that: in sample circuit, be connected to sample resistance R70, and the end ground connection of R70, the other end is connected with the input resistance R69 of output line N and A10 simultaneously.
4. electronic type electropneumatic valve positioner according to claim 1 is characterized in that: the upper end of the output termination potentiometer W1 of the in-phase amplifier that A1 forms; The output terminal of the inverting amplifier that A2 forms connects the lower end of potentiometer W1 through adjustable resistance R6; The movable contact of potentiometer W1 meets the input resistance R7 of A3 inverting amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95232697U CN2250535Y (en) | 1995-11-14 | 1995-11-14 | Electronic positioner for electric valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95232697U CN2250535Y (en) | 1995-11-14 | 1995-11-14 | Electronic positioner for electric valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2250535Y true CN2250535Y (en) | 1997-03-26 |
Family
ID=33877000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95232697U Expired - Fee Related CN2250535Y (en) | 1995-11-14 | 1995-11-14 | Electronic positioner for electric valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2250535Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235534A (en) * | 2010-03-30 | 2011-11-09 | 株式会社山武 | Positioner |
| CN102287566A (en) * | 2010-06-21 | 2011-12-21 | 江苏茶花电气有限公司 | Electromagnetic valve control circuit |
| US20120275504A1 (en) * | 2011-04-29 | 2012-11-01 | Samson Ag | Positioner |
| CN103047465A (en) * | 2011-10-14 | 2013-04-17 | 阿自倍尔株式会社 | Positioner |
| CN103278189A (en) * | 2013-05-17 | 2013-09-04 | 南京化工职业技术学院 | Portable calibration instrument for electrical/pneumatic convertor |
-
1995
- 1995-11-14 CN CN95232697U patent/CN2250535Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235534A (en) * | 2010-03-30 | 2011-11-09 | 株式会社山武 | Positioner |
| CN102287566A (en) * | 2010-06-21 | 2011-12-21 | 江苏茶花电气有限公司 | Electromagnetic valve control circuit |
| CN102287566B (en) * | 2010-06-21 | 2012-11-21 | 江苏茶花电气有限公司 | Electromagnetic valve control circuit |
| US20120275504A1 (en) * | 2011-04-29 | 2012-11-01 | Samson Ag | Positioner |
| US9690277B2 (en) * | 2011-04-29 | 2017-06-27 | Samson Ag | Positioner |
| CN103047465A (en) * | 2011-10-14 | 2013-04-17 | 阿自倍尔株式会社 | Positioner |
| CN103047465B (en) * | 2011-10-14 | 2014-08-13 | 阿自倍尔株式会社 | Positioner |
| CN103278189A (en) * | 2013-05-17 | 2013-09-04 | 南京化工职业技术学院 | Portable calibration instrument for electrical/pneumatic convertor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |