CN1163804C - Pneumatic pressure regulator - Google Patents
Pneumatic pressure regulator Download PDFInfo
- Publication number
- CN1163804C CN1163804C CNB971817103A CN97181710A CN1163804C CN 1163804 C CN1163804 C CN 1163804C CN B971817103 A CNB971817103 A CN B971817103A CN 97181710 A CN97181710 A CN 97181710A CN 1163804 C CN1163804 C CN 1163804C
- Authority
- CN
- China
- Prior art keywords
- signal
- pressure value
- solenoid valve
- valve
- discharge pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000004044 response Effects 0.000 claims abstract description 8
- 230000004888 barrier function Effects 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 10
- 239000000523 sample Substances 0.000 claims description 9
- 230000010354 integration Effects 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims 2
- 238000013459 approach Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 11
- 230000006870 function Effects 0.000 description 7
- 210000003660 reticulum Anatomy 0.000 description 6
- 238000012905 input function Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 244000287680 Garcinia dulcis Species 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Images
Landscapes
- Control Of Fluid Pressure (AREA)
- Magnetically Actuated Valves (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The present invention makes the discharge pressure value smoothly reach to the predetermined pressure value. Once the discharge pressure value reaches to the predetermined pressure value, the fluctuation of the discharge pressure value is reduced. When the difference of the discharge pressure value P(B) and the predetermined pressure value A of a pneumatic controller is larger, an electromagnetic valve 31 is driven by a pulse-width signal D so as to maintain the rapidity performance of the input and the output response (the variation characteristic of a pressure detection signal B relative to a predetermined pressure signal A). Under the condition that the discharge pressure value P approaches to the predetermined pressure value Q, the electromagnetic valve 31 is driven by a pulse frequency modulation signal J so as to decrease the exceeding quantity, namely the excessive quantity. Even if the discharge pressure value P reaches to the predetermined pressure value Q, the flowchart, namely the wave, of the discharge pressure value P can be reduced.
Description
Technical field
The present invention relates to a kind of air operated controller.
Background technology
Disclose at for example Jap.P. and to have announced the prior art that is used for providing the air operated controller of constant pressure among the 7-50418 to pneumatic equipment.
This air operated controller is so a kind of equipment, promptly when the discharge pressure of regulating from the main valve discharging, this air operated controller detects discharge pressure, detected discharge pressure and a predetermined pressure are compared, and the pulse width that the Pneumatic pressure pulse that provides to a diaphragm cavity (guidance cavity) from a solenoid valve is provided according to comparative result, pulsewidth according to the air pulsing that provides from solenoid valve increases or reduces to guide pressure subsequently, and an air supply valve body that links to each other with this diaphragm cavity is opened or closed, thereby the discharge pressure from the main valve discharging is adjusted to a predetermined pressure.
In the above-mentioned air operated controller as prior art, the driving circuit of solenoid valve is to constitute like this, and promptly wherein dutycycle is provided for the solenoid (drive coil) of solenoid valve with the so-called pulse-width signal of constant frequency change.
Therefore, discharge pressure at main valve is placed under the situation of steady state value, carry out for example FEEDBACK CONTROL, so that provide pulse-width signal to solenoid by this way, promptly the discharge pressure value is zero when the driving of solenoid valve begins, thereby the dutycycle of pulse-width signal is maximum, and the dutycycle that reaches a predetermined pressure values pulse-width signal along with the discharge pressure value reduces.
Yet, the present invention finds, be subjected at solenoid under the situation of driving of this pulse-width signal, solenoid was activated in a constant period, thereby therein under the situation of discharge pressure value near predetermined value (desired value), the quantitative change that surpasses this predetermined pressure value must be bigger, thereby near the stability this predetermined pressure value has worsened.
The present invention considers the problems referred to above and makes, and an object of the present invention is to provide a kind of air operated controller, it can make the discharge pressure value also can make the fluctuation minimum of discharge pressure value reposefully near this predetermined pressure value after the discharge pressure value reaches predetermined pressure value.
Summary of the invention
According to the present invention, under the discharge pressure value situation less with respect to predetermined pressure value, solenoid valve is subjected to the driving of pulse-width signal, thereby the rapid property that has kept input and output to respond, and in the discharge pressure value during near predetermined pressure value, solenoid valve is subjected to the driving of pulse frequency modulated signal so that the amount that surpasses can access and reduce and the fluctuation of discharge pressure value after reaching predetermined pressure value also can access and reduce.
Further, according to the present invention, with the whole bonnet that links to each other in the top of a main valve in, be provided with solenoid valve, a pressure probe portion, a control section and a display part, thereby can make small-sized and compact air operated controller.
Further,, in this bonnet, accommodate a display part that shows pressure values, be not connected with lead thereby do not need pipeline to connect according to the present invention.
Again further,, in this structure, adopted exhaust valve, thereby can carry out the opening and closing of valve surely with a retaining ring according to the present invention.
Thereby, the invention provides a kind of air operated controller, it is by increasing or reduce a guiding pressure and the discharge pressure value from a main valve discharging is adjusted to a predetermined pressure value in response to providing to a solenoid valve or from the gas that the discharging of this solenoid valve comes, wherein said discharge pressure value obtains detecting, and the pressure difference between described discharge pressure value and described predetermined pressure value is during greater than a set-point, described solenoid valve is subjected to the driving of pulse-width signal, and at described pressure difference during less than described set-point, described solenoid valve is driven by a kind of pulse frequency modulated signal.
The present invention also provides a kind of air operated controller, it is by in response to providing to increasing or reduce a guiding pressure and the discharge pressure value from a main valve discharging is adjusted to a predetermined pressure value to a solenoid valve or from the gas that the discharging of this solenoid valve comes, wherein: described discharge pressure value detected and described discharge pressure value and described predetermined pressure value between pressure difference be provided for a pulse-width modulation circuit, an integral control circuit and an absolute value circuit; The output of described integral control circuit is provided for pulse frequency modulation circuit; The output of described absolute value circuit is provided for an input end of a comparer; A reference signal is provided for another input end of described comparer as a set-point; And described integral control circuit put by the output of the output of described comparer or described pulse frequency modulation circuit again, and put again with described, the output of described pulse frequency modulation circuit and the output of described pulse-width modulation circuit are switched by the output of described comparer and are provided for described solenoid valve, at described pressure difference during greater than described set-point, thereby switching carries out that according to the output of described comparer described pulse-width modulation circuit is linked to each other with described solenoid valve and described solenoid valve is subjected to the driving of a pulse-width signal, under the situation of described pressure difference less than described set-point, output according to described comparer, thereby described integral control circuit is put again and an integration operation obtains starting and carrying out a kind of switching described pulse frequency modulation circuit is linked to each other with described solenoid valve, and when described integrated value reaches a fixed threshold, a pulse frequency modulated signal with fixed pulse width obtains output and described solenoid valve obtains driving from described pulse frequency modulation circuit, and described integral control circuit is put again to restart integration operation.
The present invention also provides a kind of air operated controller, comprise: have an air intake opening, the main valve of a gas outlet and a vent port, wherein it bar is set at the core of described main valve and is subjected to displacement along an axial direction under the deflecting action of a barrier film that extends in inside, and described main valve further comprises a valve body, this valve body opens or closes under the displacement effect of described bar, and with the whole bonnet that links to each other and have a space segment in top of described main valve, wherein in the described space segment of described bonnet, be provided with: one first solenoid valve and one second solenoid valve, their control offers the guiding pressure of a diaphragm cavity that is limited by described barrier film; A pressure probe portion, it is surveyed from the discharge pressure value of described gas outlet discharging; A control section, it exports a drive signal according to a discharge pressure signal that sends from described pressure probe portion to described first solenoid valve and described second solenoid valve; And, a display part, it shows the corresponding pressure values of a discharge pressure signal that detects with described pressure probe portion at least, and, with regard to described drive signal, pressure difference between described discharge pressure value and predetermined pressure value is during greater than a set-point, described first solenoid valve and described second solenoid valve are driven by a pulse-width signal, and at described pressure difference during less than described set-point, described first solenoid valve and second solenoid valve are driven by pulse frequency modulated signal.
Description of drawings
Fig. 1 has omitted a part of cross-sectional view, has shown the physical construction of one embodiment of the present of invention;
Fig. 2 is a circuit block diagram, has shown the whole structure of one embodiment of the present of invention;
Fig. 3 has omitted a part of cross-sectional view, has shown one of them air intake opening and a gas outlet logical state that is connected with each other;
Fig. 4 has omitted a part of cross-sectional view, has shown one of them gas outlet and the state that vent port communicates with each other;
Fig. 5 has mainly shown the structure of the functional block of a main control unit;
Fig. 6 A to 6E is an oscillogram, be mainly used in the operation of the example that shows in the key diagram 5, wherein Fig. 6 A has shown a predetermined value signal and a pressure detectable signal, Fig. 6 B has shown a pwm signal and a PFM signal, Fig. 6 C has shown the switching signal of a multiplexer, Fig. 6 D has shown an internal signal, and Fig. 6 E has shown the oscillogram of the switching signal of multiplexer.
Embodiment
Below in conjunction with accompanying drawing one embodiment of the present of invention are described.
Fig. 1 has shown the mechanical realization of the air operated controller that one embodiment of the present of invention were applied to 10.Fig. 2 has shown the circuit structure of this air operated controller.
In Fig. 1 and 2, this air operated controller 10 comprise the pressure control that is used to carry out the pneumatic equipment (not shown) main valve 11 and with main valve 11 whole bonnets 12 that engage and be covered with main valve 11.
In main valve 11, be formed with an air intake opening 13 (being also referred to as air inlet) that links to each other with a compressed gas source (not shown) and a gas outlet 14 that links to each other with the pneumatic equipment (not shown).
With a passage 15 that air intake opening 13 links to each other with gas outlet 14 in, be provided with an air supply valve body 17 that opens or closes an air supply opening 16, and these air supply valve body 17 constant force of compression of a spring 18 that are subjected to are along the direction biasing that air supply opening 16 is closed.
In main valve 11, be formed with a vent port 21, and in the exhaust port 22 that this vent port 21 is communicated with gas outlet 14, be equipped with an exhaust valve 23 that opens or closes exhaust port 22 slidably.Exhaust valve 23 is setovered along the direction that exhaust port 22 is closed consistently by the force of compression of a spring 20.
At the core of main valve 11, be provided with a bar 19, and an end of this bar 19 contacts with air supply valve body 17.The other end of bar 19 and 25 whole connections an of barrier film, and barrier film 25 extends in the inside of main valve 11.
When becoming greater than the pressure among the second diaphragm cavity 26b, move the below in the barrier film 25 towards figure when the pressure in the first diaphragm cavity 26a (guiding pressure (pilot pressure)).In the case, the far-end of the bar 19 that integrally moves down with barrier film 25 under the deflecting action of barrier film 25 has been opened air supply valve body 17, thereby the fluid SUP of compression is offered gas outlet 14 (see figure 3)s from air intake opening 13 by passage 15 and air supply opening 16.
As shown in Figure 1, two-port solenoid valve (abbreviating solenoid valve or air supply valve as) 31 and two-port solenoid valves (abbreviating solenoid valve or vent valve as) 32 are connected with the first diaphragm cavity 26a; Solenoid valve 31 is used as first solenoid valve of the air pulsing of supplying the guiding pressure that controls the first diaphragm cavity 26a that is added to barrier film 25, and solenoid valve 32 is reserved as second solenoid valve of discharged air.
In a solenoid valve 31, when current signal when a main control unit 33 is provided for a solenoid, valve body 36 is released and is provided for the first diaphragm cavity 26a from the compressed fluid SUP that air intake opening 13 provides.Therefore, as shown in Figure 3, bar 19 moves down and air supply valve body 17 is released.This means that solenoid valve 31 plays a part the air supply valve.
In another solenoid valve 32, when current signal when main control unit 33 is applied in, valve body 37 be released and the first diaphragm cavity 26a in compressed fluid be discharged into the external world by vent port 21, and the pressure of the first diaphragm cavity 26a becomes less than the pressure of the second diaphragm cavity 26b.Therefore, bar 19 moves up, and corresponding to the going up to moving of the retaining ring 34 at a middle part that is fixed on bar 19, exhaust valve 23 is released, thereby gas outlet 14 is in communication with the outside (see figure 4) by exhaust port 22 and vent port 21.This means that solenoid valve 32 plays a part vent valve.
The pressure of the second diaphragm cavity 26b is that discharge pressure P is by measuring as the pressure detecting device 35 of the pressure sniffer (pressure probe portion) that is communicated with gas outlet 14.Pressure detecting device 35 is surveyed discharge pressure P and is converted thereof into an electric signal (being also referred to as pressure detectable signal, discharge pressure signal or pressure signal) B and signal B is offered main control unit (control section) 33.
As shown in Figure 2, main control unit 33 comprises a MPU (microprocessor unit) 38, and the latter plays a part control device, decision maker, treating apparatus, operating means and memory storage.
As a digital discharge pressure signal B (adopting identical label),, and be provided for MPU38 from the discharge pressure signal B of pressure detecting device 35 output by an A/D converter 39.
The driving of solenoid valve 31,32 is respectively by air supply valve control module 40 and 41 controls of vent valve control module, and these control modules 40,41 link to each other with MPU 38.
Further, pressure values of detecting of discharge pressure signal B etc. is displayed on the light-emitting diode display (display part) 43.When needed, can obtain showing by a predetermined value Q who keys in device 44 settings.Therefore, light-emitting diode display 43 and key entry (KEY) device 44 play a part so-called user interface 45.
Constitute input and output interface 47 (see figure 2)s of a guidance panel (not shown),, and link to each other with MPU 38 by connector 46 (see figure 1)s that link to each other with the open portion on the upper surface that is formed on bonnet 12.Input and output interface 47 has analog input function 48, digital input function 49, can export the simulation output function 50 of the simulating signal of 1V to 5V, switches the power supply function 52 of output function 51 and 12V, 24V by the PNP of open collector, the pressure of NPN transistor.Be provided for MPU 38 from the simulating signal of analog input function 48 outputs by A/D converter 53.Input and output interface 47 links to each other with an external unit by one group of terminal 54.
Fig. 5 has shown a kind of structure of circuit, and the function that wherein is stored in a software in the main control unit 33 obtains expression in the mode of equivalence.In this embodiment, this function be when a predetermined pressure signal (or a predetermined valve signal) A be from a kind of function when being raised to a positive fixed value Q (predetermined pressure value) above freezing.
For example, with key in the corresponding predetermined pressure signal A of predetermined pressure value Q that device 44 sets, add input (perhaps positive input) as one, (be called subtracter and be provided for a node from the input end 61 of Fig. 5, because it is used as subtracter) 62, and discharge pressure signal B be provided for node 62 subtract each other input end (or negative input end).
Difference signal between predetermined pressure signal A and the discharge pressure signal B by well-known proportional control circuit 64, is provided for the positive input terminal of a node 63, and by along with difference control circuit 65 be provided for the negative input end of node 63.The employing of ratio that proportional control circuit 64 and difference control circuit 65 carry out and difference control, be to consider such fact, though promptly response can be vibrated when only adopting proportional control, this vibration can be attenuated under the situation that the control of ratio and difference all obtains adopting, thereby response energy accesses stable.In this embodiment, in order to eliminate trouble, the output signal of node 63 is considered to the difference signal C (C=A-B) between predetermined pressure signal A and the discharge pressure signal B.
This difference signal C is converted into a kind of width modulation (PWM) signal D by a PWM (width modulation) circuit 67, and is provided for a stiff end (or fixed contact) 68b of the multiplexer 68 that constitutes switching device shifter.
Difference signal C is provided for an integral control circuit 69 and its signal G is converted into a kind of pulse frequency modulation (PFM) signal J and is provided for another stiff end (or fixed contact) 68c by a PFM (pulse frequency modulation) circuit 70.At this, PFM signal J puts signal again as one and is provided for integral control circuit 69 by an OR circuit 75.A switching signal H is provided for a switching controls end of another multiplexer 72 from an end S of integral control circuit 69.
Above-mentioned difference signal C is provided for an absolute value circuit 74, and its difference absolute value signal | and C| is provided for an input end of comparer 73.A reference signal Δ E is provided for the other end of comparer 73.Output signal F of comparer 73 outputs, this output signal F is used as one and puts signal or a switching signal again.Therefore, output signal F is also referred to as and puts signal or switching signal again.Output signal F is provided for integral control circuit 69 as putting signal again by OR circuit 75, and is provided for the switching controls end of multiplexer 68 further as switching signal.
Pwm signal D or PFM signal J, common port (or public contact) 68a by multiplexer 68 and by a common port (or public contact) 72a, multiplexer 72 as stiff end 72b, as drive signal K, and be provided for air supply valve 31, and pwm signal D or PFM signal J also are provided for vent valve 32 by common port 72a and stiff end 72c.
With the drive signal K that offers air supply valve 31 correspondingly, the time of opening of air supply valve 31 is controlled, and compressed fluid SUP is provided for guidance cavity 26a.
Under the state that vent valve 32 is closed and air supply valve 31 is opened, compressed fluid is provided to guidance cavity 26a from air supply valve 31, and under the situation that air supply valve 31 cuts out and vent valve 32 is opened, the compressed fluid among the guidance cavity 26a is discharged into extraneous (see figure 1) by vent valve 32 and vent port 21.
In Fig. 5, the pressure that control is in response to guidance cavity 26a of opening of air supply valve body (being also referred to as main valve, because it can be considered to main valve 11) 17 carries out.The discharge pressure P of gas outlet 14 is converted to pressure signal B as electric signal by pressure detecting device 35, and is fed back to node 62 as a kind of feedback signal.
Basically the operation of the foregoing description is described below in conjunction with the oscillogram of Fig. 6.Control at this MPU.
When keying in device 44 and set predetermined pressure value Q, in Fig. 6, as shown in the moment t0, the prearranged signals A (seeing the waveform that the dotted line among Fig. 6 A is represented) that is represented by a stepped waveform rises to high level Q (A=Q) from zero level.In the case, the reference signal Δ E of comparer 73 settings is set to a few percent of predetermined pressure value Q.
At moment t0, owing to be zero as the value of the pressure detectable signal B (seeing the waveform that the solid line among Fig. 6 A is represented) of the output signal of pressure detecting device 35, thereby difference signal C has maximal value.Because absolute value signal | c| is also greater than the level of reference signal Δ E, output signal F (seeing Fig. 6 C) is in low level, and be between low period at output signal F, the public contact 68a of multiplexer 68 is maintained at state shown in Figure 5-wherein public contact 68a and links to each other with the fixed contact 68b of pwm circuit 67 sides.Further, the switching signal H (seeing Fig. 6 E) that exports from integral control circuit 69 is maintained at low level, has surpassed a positive threshold value Th up to integrated signal G (seeing Fig. 6 D).Be maintained between low period at switching signal H, the common port 72a of multiplexer 72 links to each other with the stiff end 72b of air supply valve 31 sides.Therefore, at moment t0, for predetermined pressure value Q, the maximal value of difference signal C is set to C=Q, thereby pwm circuit 67 promptly obtains driving with full dutycycle with the dutycycle of maximum, and air supply valve 31 (see figure 1)s are opened and compressed fluid SUP is provided for the first diaphragm cavity 26a from air intake opening 13 by air supply valve 31.Therefore, bar 19 moves downward with barrier film 25, and air supply valve body 17 is that main valve 11 is opened.Therefore, compressed fluid SUP is provided to gas outlet 14 from air intake opening 13.
After moment t0, discharge pressure P increases gradually, and as shown in Figure 6A, the pressure detectable signal B of pressure detecting device 35 and discharge pressure P increase pro rata gradually, and difference signal C reduces gradually, thereby the dutycycle of the pwm signal D (seeing Fig. 6 B) of pwm circuit 67 is reduced gradually.Near moment t1, when difference signal C becomes less than a set-point, get minimum value as the dutycycle of the pwm signal D of the output signal of pwm circuit 67.
In absolute value signal | C| becomes less than the moment t2 of the level of reference signal Δ E, comparer 73 by paraphase and output signal F from low level by paraphase to high level (seeing Fig. 6 C).Therefore, the public contact 68a of multiplexer 68 is switched to the fixed contact 68c of PFM circuit 70 sides, and integral control circuit 69 is put again and make integrated signal G get null value, and with the corresponding integration of difference signal C from null value.At moment t2, PWM control is switched to PFM control.Polarity as the integrated signal G of the output signal of integral control circuit 69 is placed in negative polarity.
When integrated signal G reaches negative threshold value-Th, PFM signal J (seeing Fig. 6 B)-it is the ON signal-by from PFM circuit 70 output of constant pulsewidth, and this signal is provided for air supply valve 31 as a drive signal K, and wherein the ON of this ON signal is and the minimum duty cycle of for example pwm signal D corresponding period period.
At moment t3, the value of pressure detectable signal B becomes and is approximately equal to predetermined pressure value Q.At moment t3, air supply valve 31 is subjected to the driving of PFM signal J, and the work Tf in period of PFM signal J is longer than the fixed time period Tp of pwm signal D, therefore discharge pressure P is that pressure detectable signal B starts its so-called soft landing with respect to predetermined pressure value Q, and surpasses or excessive generation is reduced or is eliminated basically.
When PFM signal J when the moment, t3 obtained exporting, integral control circuit 69 put by this PFM signal J again, and integration operation is restarted from null value.
Discharge pressure P integral control circuit 69 moment t4 by after putting again for some reason and when the direction that increases changes, the inclination of integrated signal G has positive slope, and when integrated signal G when moment t5 has surpassed threshold value Th, switching signal H (seeing Fig. 6 E) is converted to high level from low level.Therefore, multiplexer 72 links to each other with vent valve 32 sides, and the PFM signal J that with dashed lines shows is provided for vent valve 32 sides.
Produce and guidance cavity (first diaphragm cavity) is opened during 26a is in communication with the outside by vent port 21 at PFM signal J 32 of this vent valves.When bar 19 moved up owing to this effect, exhaust valve 23 was at the interim spool that obtains when corresponding with generation period of PFM signal J, thereby the discharge pressure P of gas outlet 14 reduces.At moment t6, air supply valve 31 is opened once more.
In this way, even at pressure detectable signal B is after discharge pressure P has reached the moment t3 of predetermined pressure value Q, air supply valve 31 and vent valve 32 are subjected to the control of PFM signal J, and PFM signal J have be longer than PWM control period Tp (frequency) Tf in period (seeing Fig. 6 B) and be subjected to and integrated signal (integrated value) the G control corresponding of difference signal (pressure difference) C.Therefore, can keep the discharge pressure P of air operated controller 10 to remain on a stable pressure values with the fluctuation of minimum.
In the case, at the external pneumatic equipment that links to each other with gas outlet 14 under the period of constant or fixed discharge pressure P work long situation, in PFM control zone (period), opening frequency (frequency of operation) and can access and reduce as the vent valve 32 of solenoid valve and air supply valve 31, thereby only adopt the control of PWM control to compare with traditional, can also realize that an advantage-promptly be used to controls the compressed fluid SUP pulse frequency modulation consumption of guidance cavity 26a and can access and reduce.
Certainly, as shown in Figure 2, adopt pressure to switch output function 51, can play the effect of pressure switch.For example, promptly do not reach predetermined pressure value Q or discharge pressure P at discharge pressure P and can not be improved and take place when unusual owing to lacking the pressure supply at discharge pressure P, this discharge pressure P abnormality can obtain from the external world detecting.
Further, under discharge pressure P is displayed on situation on the light-emitting diode display 43, need adorn piezometer, and not need its pipeline to be connected with lead in the external world.
Also have, even under the situation that compressed fluid SUP is not provided, for example, utilize and key in device 44 and light-emitting diode display 43, the pressure of pressure can be configured to digital value and can obtain showing.
Can also divide a plurality of stages to control predetermined pressure by the Long-distance Control that adopts analog input function 48 or digital input function 49.
Much less be to the invention is not restricted to the foregoing description, and under the prerequisite that does not depart from the scope of the present invention, can realize various structures.
As mentioned above, according to the present invention, can obtain such advantage, promptly under the situation of the discharge pressure value of air operated controller less with respect to predetermined pressure value (difference of predetermined pressure value and discharge pressure value is bigger), solenoid valve is operated by pulse-width signal, thereby the rapid property (the discharge pressure value is with respect to the variation characteristic of predetermined pressure value) of input and output response is maintained, and under the situation of discharge pressure value near predetermined pressure value, solenoid valve is subjected to the driving of pulse frequency modulated signal, thereby surpasses or excessive amount is reduced and the fluctuation that reached the discharge pressure value of predetermined pressure value is that so-called ripple can access and reduces.
In a word, according to air operated controller of the present invention, realized such advantage, promptly the flow from the main valve fluid discharged can access adjusting accurately.
Claims (8)
1. air operated controller, it is by in response to providing to increasing or reduce a guiding pressure and the discharge pressure value from a main valve discharging is adjusted to a predetermined pressure value to a solenoid valve or from the gas that this solenoid valve discharging comes, wherein:
Described discharge pressure value detected and described discharge pressure value and described predetermined pressure value between pressure difference be provided for a pulse-width modulation circuit, an integral control circuit and an absolute value circuit;
The output of described integral control circuit is provided for pulse frequency modulation circuit;
The output of described absolute value circuit is provided for an input end of a comparer;
A reference signal is provided for another input end of described comparer as a set-point; And
Described integral control circuit put by the output of the output of described comparer or described pulse frequency modulation circuit again, and put again with described, the output of described pulse frequency modulation circuit and the output of described pulse-width modulation circuit are switched by the output of described comparer and are provided for described solenoid valve
At described pressure difference during greater than described set-point, carry out that described pulse-width modulation circuit is linked to each other with described solenoid valve and described solenoid valve is subjected to the driving of a pulse-width signal thereby switch according to the output of described comparer,
Under the situation of described pressure difference less than described set-point, output according to described comparer, thereby described integral control circuit is put again and an integration operation obtains starting and carrying out a kind of switching described pulse frequency modulation circuit is linked to each other with described solenoid valve, and when described integrated value reaches a fixed threshold, a pulse frequency modulated signal with fixed pulse width obtains output and described solenoid valve obtains driving from described pulse frequency modulation circuit, and described integral control circuit is put again to restart integration operation.
2. according to the air operated controller of claim 1, wherein said set-point is variable.
3. according to the air operated controller of claim 1, wherein said set-point is set to a few percent of described predetermined pressure value.
4. according to the air operated controller of claim 1, wherein when producing described pulse-width signal or described pulse frequency modulated signal, described signal is to produce according to the ratio of the described pressure difference between described discharge pressure value and the described predetermined pressure value and difference control signal.
5. air operated controller comprises:
Main valve with an air intake opening, a gas outlet and a vent port, wherein it bar is set at the core of described main valve and is subjected to displacement along an axial direction under the deflecting action of a barrier film that extends in inside, and described main valve further comprises a valve body, this valve body opens or closes under the displacement effect of described bar, and
With the whole bonnet that links to each other and have a space segment in a top of described main valve,
Wherein in the described space segment of described bonnet, be provided with: one first solenoid valve and one second solenoid valve, their control offers the guiding pressure of a diaphragm cavity that is limited by described barrier film; A pressure probe portion, it is surveyed from the discharge pressure value of described gas outlet discharging; A control section, it exports a drive signal according to a discharge pressure signal that sends from described pressure probe portion to described first solenoid valve and described second solenoid valve; And, a display part, it shows the corresponding pressure values of a discharge pressure signal that detects with described pressure probe portion at least,
And, with regard to described drive signal, pressure difference between described discharge pressure value and predetermined pressure value is during greater than a set-point, described first solenoid valve and described second solenoid valve are driven by a pulse-width signal, and at described pressure difference during less than described set-point, described first solenoid valve and second solenoid valve are driven by pulse frequency modulated signal.
6. according to the air operated controller of claim 5, wherein be connected with a connector on an operation part that is formed on the upper surface of described bonnet, this connector is electrically connected to an input and output interface that is arranged on outside the described bonnet to a control section that is arranged in the described bonnet.
7. according to the air operated controller of claim 5, wherein valve body comprises an exhaust valve, the effect of the force of compression of a spring members of this exhaust valve opposing and leave an exhaust port so that the gas outlet is communicated with a vent port, thereby and a retaining ring meshing with neighboring part of described exhaust valve with described bar be subjected to displacement and make described exhaust valve leave described exhaust port.
8. according to the air operated controller of claim 5, wherein said control section comprises: a microprocessor unit; A conversion of signals part, it becomes a kind of digital signal to a discharge pressure conversion of signals that sends from described pressure probe portion; And, an air supply valve control module and a vent valve control module, they drive and control described first solenoid valve and described second solenoid valve according to the control signal that sends from described microprocessor unit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB971817103A CN1163804C (en) | 1997-02-06 | 1997-02-06 | Pneumatic pressure regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB971817103A CN1163804C (en) | 1997-02-06 | 1997-02-06 | Pneumatic pressure regulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1245569A CN1245569A (en) | 2000-02-23 |
| CN1163804C true CN1163804C (en) | 2004-08-25 |
Family
ID=5178211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB971817103A Expired - Lifetime CN1163804C (en) | 1997-02-06 | 1997-02-06 | Pneumatic pressure regulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1163804C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2279366B1 (en) * | 2008-04-21 | 2011-11-02 | Emerson Process Management Regulator Technologies, Inc. | Valve body with dual sense mechanism |
| JP6335757B2 (en) * | 2014-10-31 | 2018-05-30 | 株式会社桂精機製作所 | Gas pressure regulator |
-
1997
- 1997-02-06 CN CNB971817103A patent/CN1163804C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1245569A (en) | 2000-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6305401B1 (en) | Pneumatic pressure regulator | |
| EP1574696A3 (en) | Power supply arrangement for a fuel injector drive circuit | |
| CN1670792A (en) | Light emitting element driving device and portable apparatus equipped with light emitting elements | |
| WO2005096480A1 (en) | Power supply and display | |
| CN1991222A (en) | Solenoid-operated valve controller | |
| CN1163804C (en) | Pneumatic pressure regulator | |
| US8217581B2 (en) | Induction lamp with brightness adjustment capability | |
| US6719536B2 (en) | Vacuum generator with power failure operation mode | |
| WO2017025430A1 (en) | Apparatus and method for controlling an electro-pneumatic leveling valve | |
| JPH09101827A (en) | Air pressure regulator | |
| US6786228B2 (en) | Air circuit with air economizing and memory | |
| CN100403358C (en) | Controller of light-emitting diode and controlling method thereof | |
| CN1081775C (en) | Circuit for controlling magnetic power unit of gas range | |
| US11056302B2 (en) | Coil control device of electronic magnetic contactor | |
| CN107666000A (en) | Controlled using the heap voltage of the reforestation practices of booster converter | |
| CN1925305A (en) | Fan control device and method | |
| CN1553066A (en) | Universal intelligent buffer gas pressure reducing valves | |
| JP3801336B2 (en) | Load drive device | |
| KR100334631B1 (en) | Pneumatic pressure regulator | |
| CN2799793Y (en) | Controller for electric automobile window | |
| CN217282903U (en) | Positive terminal switch controller based on NMOS pipe control | |
| KR100462194B1 (en) | Multi-Picker of Handler | |
| CN1197727C (en) | Current-limiting control method of electric motor for electric locomotive and its equipment | |
| KR100369138B1 (en) | Response improve method of variable nozzle turbo charger | |
| JPH0778625A (en) | Solid electrolyte fuel cell and its driving method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20040825 |
|
| CX01 | Expiry of patent term |