CN1149341C - Electropneumatic proportional differential control valve - Google Patents

Electropneumatic proportional differential control valve Download PDF

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Publication number
CN1149341C
CN1149341C CNB991047184A CN99104718A CN1149341C CN 1149341 C CN1149341 C CN 1149341C CN B991047184 A CNB991047184 A CN B991047184A CN 99104718 A CN99104718 A CN 99104718A CN 1149341 C CN1149341 C CN 1149341C
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CN
China
Prior art keywords
pressure
aperture
switch electromagnetic
operated mechanism
fluid pressure
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Expired - Fee Related
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CNB991047184A
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Chinese (zh)
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CN1241688A (en
Inventor
于春阳
王春洋
赵彤
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SMC Corp
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SMC Corp
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Publication of CN1241688A publication Critical patent/CN1241688A/en
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Abstract

To improve responsiveness to a feedback signal. SOLUTION: An electropeneumatic proportional pressure difference control valve is operated for making the pressure difference between two signal pressure ports approach a target value. In such a control valve, pressure fluid is supplied to and discharged from pilot chambers of a first fluid pressure operation mechanism and a second fluid pressure operation mechanism through a first ON-OFF solenoid valve and a second ON-OFF solenoid valve of a second position third port. The first and second ON-OFF solenoid valves are driven with pulsative lines with constant frequency. Pulse width of the pulse lines is varied according to error between the target value and the present value.

Description

Electropneumatic proportional differential control valve
Technical field
The invention belongs to two apertures to the hydrodynamic pressure executive component, two apertures supply pressure reduction that for example are communicated with the chamber of fluid pressure cylinder piston both sides respectively, and make the Electropneumatic proportional differential control valve of the set power of hydrodynamic pressure executive component output.
Background technique
As making executive component keep the electro-pneumatic proportional valve of certain active force, have the fair 3-1553 of known spy number at stroke terminal.This electro-pneumatic proportional valve constitutes like this, promptly has Returnning spring, the opposing party of spool to act on proportional solenoidal output in a side of spool effect, at the double side acting of spool feedback pressure is arranged.With the A aperture of electro-pneumatic proportional valve and the pressure differential resetting in B aperture is setting value (desired value), and supplies with to the pressure chamber in opposite directions of hydrodynamic pressure executive component by a pair of output aperture of hydrodynamic pressure executive component.
In this electro-pneumatic proportional valve, owing to be with solenoid and the moving spool that drives unshakable in one's determination, so not so good to the responsiveness of feedback signal.In addition, this electro-pneumatic proportional valve, in the proportional solenoid input current was 0～25% scope, the pressure and the electric current in B aperture reduced pro rata, and in the proportional solenoid input current was 25～100% scope, the pressure and the electric current in A aperture raise pro rata.Thereby be to be the variation in pressure that is converted to the A aperture on 25% the position from the variation in pressure in B aperture at electric current, so the flatness that differential pressure changes is good inadequately.
Goal of the invention
The 1st purpose of the present invention is, as Electropneumatic proportional differential control valve, improve its responsiveness to feedback signal, the 2nd purpose of the present invention is to make the A aperture of Electropneumatic proportional differential control valve and the pressure reduction output in B aperture import pro rata, to change linearly with voltage in the scope of hope.
The present invention for achieving the above object, the control valve body is provided with the pressure feed aperture, discharge orifice, and signal pressure aperture A and B, move the intrinsic spool of control valve by the 1st fluid pressure operated mechanism and the 2nd fluid pressure operated mechanism, thereby the pressure difference that makes two signal pressure aperture A and B is in the close Electropneumatic proportional differential control valve of desired value, with following structure as the 1st structure, promptly via 23 the 1st logical switch electromagnetic valves and the 2nd switch electromagnetic valve realize pressure fluid to/from the supply/discharging in each control room of the 1st fluid pressure operated mechanism and the 2nd fluid pressure operated mechanism, pulse sequence with certain frequency drives the 1st switch electromagnetic valve and the 2nd switch electromagnetic valve, the pulse amplitude of pulse sequence can corresponding to desired value and currency the two difference and change.
In the 1st structure of the present invention, with following structure as the 2nd structure, promptly with each pressure of two pressure transducer testing signal pressure vents A and B, calculate the two the duty factor of difference of the pressure reduction currency and desired value that detect corresponding to each pressure transducer, the opening area and the duty factor that make each control room in the 1st switch electromagnetic valve and the 2nd switch electromagnetic valve, that make same the 1st fluid pressure operated mechanism of fluid pressure source and the 2nd fluid pressure operated mechanism be connected are proportional.
In the of the present invention the 1st and the 2nd structure, with following structure as the 3rd structure, promptly in each cylinder hole of the 1st fluid pressure operated mechanism and the 2nd fluid pressure operated mechanism, be equipped with the piston that can slide freely, each piston and spool link, the outer side chamber of each piston is as the control room, the medial chamber of each piston is as the feedback chamber, and the feedback chamber of the 1st fluid pressure operated mechanism is communicated with signal pressure aperture A, and the feedback chamber of the 2nd fluid pressure operated mechanism is communicated with signal pressure aperture B.
Among the present invention, " electricity is empty " of said Electropneumatic proportional differential control valve is meant that not only with electrical signal conversion be the air pressure signal, but also means that with electrical signal conversion be fluid pressure signals such as air pressure, fluid pressure.
Brief description of drawings
Fig. 1 is the form of implementation of Electropneumatic proportional differential control valve of the present invention;
Fig. 2 is the flow chart of Electropneumatic proportional differential control valve form of implementation of the present invention;
The plotted curve of Fig. 3 illustrates the voltage input V1 of desired value and the relation between the pressure reduction output PL;
The experimental result of the step response the when plotted curve of Fig. 4 illustrates and is desired value with-0.2MPa and 0.2MPa;
The plotted curve of Fig. 5 illustrates supply pressure and is set at 0.22MPa, Va=0.15L, Vb=0.15L, and the experimental result of the step response when being desired value with 0.2MPa;
The plotted curve of Fig. 6 illustrates supply pressure and is set at 0.3MPa, Va=0.15L, Vb=0.15L, and the experimental result of the step response when being desired value with 0.2MPa.
The mode that carries out an invention
Fig. 1 illustrates the invention process form of Electropneumatic proportional differential control valve.The Electropneumatic proportional differential control valve of the invention process form is made of control valve body the 1, the 1st switch electromagnetic valve the 2, the 2nd switch electromagnetic valve the 3, the 1st pressure transducer the 4, the 2nd pressure transducer 5, central processing unit 7 and air pressure source (fluid pressure source) 8.Have the 1st fluid pressure operated mechanism and the 2nd fluid pressure operated mechanism that the spool 19 of control valve body 1 is operated, by 23 the 1st logical switch electromagnetic valves 2 and the 2nd switch electromagnetic valve 3 realize pressure fluids to/from the supply/discharging in each control room 46,47 of the 1st fluid pressure operated mechanism and the 2nd fluid pressure operated mechanism, pulse sequence with certain frequency drives the 1st switch electromagnetic valve 2 and the 2nd switch electromagnetic valve 3, the pulse amplitude that makes pulse sequence corresponding to desired value and currency the two difference and change.
Control valve body 1 is the 1st outer cover 10, valve body 11 and the 2nd outer cover 12 are linked in order and to constitute.On valve body 11, be formed with the central hole with the level of (being left and right directions among Fig. 1) extension along its length, this central hole is that the 1st cylinder hole 14, patchhole 15 are identical with the 2nd cylinder hole 16 diameters with 16, the 1 cylinder holes 14, the 2nd cylinder hole from a left side, and patchhole 15 is littler than their diameters.Cover 18 is inserted in the patchhole 15 and fix, and cover 18 is interior can be slidably inserted into spool 19 freely.Have 5 annular grooves 21～25 to form in order from a left side on the patchhole 15, and be formed with 5 through holes 31～35 that internal surface is connected with outer surface on cover 18, each annular groove 21～25 is communicated with as shown in figure with through hole 31～35 respectively.On cover 18 the outer surface, between through hole 31～35 and the outside of through hole 31,35 be formed with the annular groove shown in the figure, O type ring is housed in each annular groove, seal between the internal surface with the outer surface of cover 18 and patchhole 15.
Be formed with the 1st shoulder 27, middle shoulder 28 and the 2nd shoulder 29 on the spool 19, when spool 19 was positioned at illustrated neutral position, the 1st shoulder 27, middle shoulder 28 and the 2nd shoulder 29 were closed through hole 31, through hole 33 and through hole 35 respectively.There is minor diameter at the two ends of spool 19, about minor diameter on chimeric respectively the 1st piston 44 and the 2nd piston 45 arranged, chimeric packing ring and screw on nut and the 1st piston 44 and the 2nd piston 45 are fixed on the preposition on each minor diameter.Be formed with spring housing 39 and 40 respectively on the 1st outer cover 10 and the 2nd outer cover 12, spring housing 39 and 40 is communicated with the 1st cylinder hole 14 and the 2nd cylinder hole 16 respectively.Between the end face of spring housing 39 and the 1st piston 44 spring 41 is housed, between the end face of spring housing 40 and the 2nd piston 45 spring 42 is housed, spool 19 is pushed to the neutral position.
Base plate 37 contact also is attached on the lower end surface of valve body 11, has vent ports R1, signal pressure aperture A, pressure feed aperture P, signal pressure aperture B and vent ports R2 on the one side of base plate 37 in order from a left side.By illustrated path, vent ports R1, signal pressure aperture A, pressure feed aperture P, signal pressure aperture B and vent ports R2 are communicated with annular groove 21～25 respectively.The chamber in the 1st piston 44 outsides (left side) is called the 1st control room 46, the chamber in the 2nd piston 45 outsides (right side) is called the 2nd control room 47.And the chamber of the 1st piston 44 inboards (right side) is called feedback chamber 48 the 1st, the chamber in 45 inboards (left side) is called feedback chamber 49 the 2nd.Signal pressure aperture A also is communicated with feedback chamber 48 the 1st, and signal pressure aperture B also is communicated with feedback chamber 49 the 2nd.
The 1st switch electromagnetic valve 2 and the 2nd switch electromagnetic valve 3 are 3 logical 2 valves at a high speed, and pressure feed aperture p, signal pressure aperture a and vent ports r are arranged respectively.The signal pressure aperture a of the 1st switch electromagnetic valve 2 is communicated with the 1st control room 46, and the signal pressure aperture a of the 2nd switch electromagnetic valve 3 is communicated with the 2nd control room 47.The pressure feed aperture p of the 1st switch electromagnetic valve 2 and the 2nd switch electromagnetic valve 3 is communicated with air pressure source 8 respectively, and the vent ports r of the 1st switch electromagnetic valve 2 and the 2nd switch electromagnetic valve 3 is communicated with atmosphere respectively.
The upper surface of valve body 11 is uploaded the pressure perception portion that is equipped with the 1st pressure transducer 4 and the 2nd pressure transducer 5, the 1 pressure transducers 4 and the 2nd pressure transducer 5 and is communicated with signal pressure aperture A and signal pressure aperture B through path 51,52, annular groove 22,24 respectively.The output signal of the 1st pressure transducer 4 and the 2nd pressure transducer 5 is imported respectively in the central processing unit 7, and the switch electromagnetic valve operation signal that central processing unit 7 sends is by the operation unit (single action solenoid) of lead 53,54 input the 1st switch electromagnetic valves 2 and the 2nd switch electromagnetic valve 3.Signal pressure aperture A is communicated with for the round mouth for round mouth and piston rod side with signal pressure aperture B by the pipeline and the piston side of air pressure (fluid pressure) cylinder 55.
Below, the working principle of the Electropneumatic proportional differential control valve of the invention process form is described.When the pressure of signal pressure aperture A and signal pressure aperture B is made as Pa and Pb, the current pressure reduction PL=Pa-Pb that is output as of Electropneumatic proportional differential control valve.The compression area in the compression area of the 1st control room 46 sides of the 1st piston 44 and the 2nd control room 47 of the 2nd piston 45 all is made as A1, and the compression area of the compression area of feedback chamber the 1st 48 sides of the 1st piston 44 and feedback chamber 49 the 2nd of the 2nd piston 45 all is made as A2.In addition, establish spring 41 and 42 spring constants are respectively K, and the actuating pressure in the 1st control room 46 and the 2nd control room 47 is respectively P1, P2, the displacement of spool 19 is dX, so, can obtain following formula according to equilibrium of forces.
(P1-P2)·A1+2K·dX＝(Pa-Pb)·A2
Promptly
PL＝Pa-Pb＝((P1-P2)·A1+2K·dX)/A2
Here, establish the valve that T1/T and 1-T1/T be respectively the 1st switch electromagnetic valve 2 and the 2nd switch electromagnetic valve 3 and open time ratio (duty factor), control with PWM method (pulse amplitude modulation modulation method).Promptly produce the two difference of the pressure reduction currency (Pa-Pb) and desired value that detect with the 1st and the 2nd pressure transducer 4,5 operation signal corresponding, that the 1st switch electromagnetic valve 2 and the 2nd switch electromagnetic valve 3 are operated by central processing unit 7.Pressure reduction P1-P2 changes along with the variation of T1/T.Therefore, can only adjust T1/T and control delivery pressure PL by pressure reduction P1-P2.When spool 19 is mobile to the left from middle position, be communicated with between pressure feed aperture P and the signal pressure aperture B and pressure fluid is flowed into from the piston rod side of pneumatic cylinder 55, be communicated with between signal pressure aperture A and the discharge orifice R1 and the fluid self-discharging aperture R1 of the piston side of pneumatic cylinder 55 is discharged, the piston rod of pneumatic cylinder 55 retreats.When spool 19 was mobile to the right, fluid flowed in the opposite direction, and the piston rod of pneumatic cylinder 55 advances.
Fig. 2 is the flow chart that utilizes Electropneumatic proportional differential control valve with the PWM method output PL to be controlled.Judge at step S1 whether the PWM cycle begin, begin, then make the 1st switch electromagnetic valve 2 and 3 actions of the 2nd switch electromagnetic valve, enter step S3 at step S2 if be judged as the PWM cycle.If being judged as PWM at step S1 does not begin, then enter step S3.
At step S3, judge whether to arrive sampling instant, if be judged as the arrival sampling instant, then at step S4 to input signal (goal pressure is poor) and the controlling object pressure difference (currency of pressure reduction: Pa-Pb) sample.Next enter step S5, the corresponding duty factor of difference of calculating and pressure reduction currency and desired value, and then enter step S6 and operate the 1 2nd switch electromagnetic valve according to duty factor.The valve that promptly calculates is opened the operation signal of (ON) time ratio T1/T and 1-T1/T, transmits through the single action solenoid of lead 53,54 to the 1st switch electromagnetic valve 2 and the 2nd switch electromagnetic valve 3 from central processing unit 7.In the 1st switch electromagnetic valve 2 and the 2nd switch electromagnetic valve 3, produce with duty factor T1/T and the corresponding signal pressure P1 of 1-T1/T, P2 (make opening area and duty factor in the 1st switch electromagnetic valve 2 and the 2nd switch electromagnetic valve 3, that the control room 47 of the control room 46 of air pressure source 8 same the 1st fluid pressure operated mechanisms and the 2nd fluid pressure operated mechanism is communicated with proportional), and import the 1st control room 46 and the 2nd control room 47 respectively.Spool 19 is according to signal pressure P1, the P2 mobile position in the 1st control room 46 and the 2nd control room 47, to eliminate the poor of above-mentioned the two.
Return step S1 after the action of completing steps S6, when step S3 does not judge the arrival sampling instant, also return step S1.
When making for example current pressure reduction PL greater than desired value by above-mentioned control, operate the 1st switch electromagnetic valve 2 and the 2nd switch electromagnetic valve 3, thereby the pressure in the control room 46 of the 1st fluid pressure operated mechanism is reduced, and the pressure in the control room 47 of the 2nd fluid pressure operated mechanism raises.And situation is operated the 1st switch electromagnetic valve 2 and the 2nd switch electromagnetic valve 3 and is made pressure reduction PL increase in contrast the time.
Below, experimental result is described.At first, supply pressure is made as 0.4MPa, drives the 1st switch electromagnetic valve 2 and the 2nd switch electromagnetic valve 3 with the pulse sequence of 50 hertz of frequencies.The volume of the pipeline that is communicated with signal pressure aperture A, B, executive component etc. is respectively Va=5L, Vb=5L.Control mode is the PID mode, through a large amount of experiments, draws the relation curve between desired value voltage input V1 shown in Figure 3 and the pressure reduction output PL.As can be seen, V1 is in the scope of 1～5V in the input of desired value voltage, and pressure reduction output PL and voltage are imported pro rata, changed linearly.
The plotted curve of Fig. 4 is under above-mentioned identical condition, with the experimental result of-step when 0.2MPa, 0.2MPa are desired value response.By this plotted curve as can be known, the response time is 2～2.5 seconds, to the two the judgement of difference and all good to the responsiveness of feedback signal of desired value and currency.
The plotted curve of Fig. 5 is that supply pressure is set at 0.22MPa, Va=0.15L, Vb=0.15L, and the experimental result of the step response when being desired value with 0.2MPa.And the plotted curve of Fig. 6 to be supply pressure be set at 0.3MPa, Va=0.15L, Vb=0.15L, and the experimental result of the step response when being desired value with 0.2MPa.Shown in Figure 6 as Fig. 5, when the volume of the pipeline that is communicated with signal pressure aperture A, B, executive component etc. reduced, the response of Electropneumatic proportional differential control valve accelerated, the vibration aggravation under the state of equilibrium.In addition, response can produce the excess of stroke soon when supply pressure was high.
As scheme 1 said Electropneumatic proportional differential control valve, the 1st switch electromagnetic valve and the 2nd switch electromagnetic valve pulse sequence with certain frequency is driven, the pulse amplitude of pulse sequence along with desired value and currency the two extent and change, by 23 the 1st logical switch electromagnetic valves and the 2nd switch electromagnetic valve realize pressure fluid to/from each control room supply/discharging of the 1st fluid pressure operated mechanism and the 2nd fluid pressure operated mechanism spool is moved.Therefore, compare with moving prior art unshakable in one's determination with the usage ratio solenoid, the present invention is very excellent to the responsiveness of feedback signal.In addition, can realize in desirable scope that pressure reduction and voltage are imported pro rata, variation linearly.

Claims (2)

1. Electropneumatic proportional differential control valve, wherein, the control valve body is provided with the pressure feed aperture, discharge orifice, and signal pressure aperture A and B, move the intrinsic spool of control valve by the 1st fluid pressure operated mechanism and the 2nd fluid pressure operated mechanism, the pressure difference of two signal pressure aperture A and B is close to desired value, it is characterized in that, via 23 the 1st logical switch electromagnetic valves and the 2nd switch electromagnetic valve realize pressure fluid to/from the supply/discharging in each control room of the 1st fluid pressure operated mechanism and the 2nd fluid pressure operated mechanism, pulse sequence with certain frequency drives the 1st switch electromagnetic valve and the 2nd switch electromagnetic valve, the pulse amplitude of pulse sequence corresponding to the desired value of the pressure difference of two signal pressure aperture A and B and currency the two difference and change.
2. Electropneumatic proportional differential control valve as claimed in claim 1, it is characterized in that, in each cylinder hole of the 1st fluid pressure operated mechanism and the 2nd fluid pressure operated mechanism, be equipped with the piston that can slide freely, each piston and spool link, the outer side chamber of each piston is as the control room, the medial chamber of each piston is as the feedback chamber, and the feedback chamber of the 1st fluid pressure operated mechanism is communicated with signal pressure aperture A, and the feedback chamber of the 2nd fluid pressure operated mechanism is communicated with signal pressure aperture B.
CNB991047184A 1998-05-29 1999-04-01 Electropneumatic proportional differential control valve Expired - Fee Related CN1149341C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP16437298A JP4003218B2 (en) 1998-05-29 1998-05-29 Electro-pneumatic proportional differential pressure control valve
JP164372/1998 1998-05-29

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CN1241688A CN1241688A (en) 2000-01-19
CN1149341C true CN1149341C (en) 2004-05-12

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KR101638892B1 (en) * 2009-03-30 2016-07-13 보르그워너 인코퍼레이티드 A control valve
US8847103B2 (en) 2010-07-16 2014-09-30 Hypertherm, Inc. Electronic pressure regulator
CN108679026B (en) * 2018-07-17 2019-05-17 浙江大学 A kind of multiple-sensor integration formula intelligent control proportional reversing valve and its control method

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JP4003218B2 (en) 2007-11-07
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