CN104216426B - A kind of liquid quantitative drips control system and method - Google Patents
A kind of liquid quantitative drips control system and method Download PDFInfo
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- CN104216426B CN104216426B CN201410484264.9A CN201410484264A CN104216426B CN 104216426 B CN104216426 B CN 104216426B CN 201410484264 A CN201410484264 A CN 201410484264A CN 104216426 B CN104216426 B CN 104216426B
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Abstract
The invention discloses a kind of liquid quantitative to drip control system and method, wherein system includes: drain pipe road that Liquid storage container, PID PID control unit and Liquid storage container are respectively communicated with and gas feeding pipe；Being provided with effusion meter on drain pipe road, gather the flow information of liquid in drain pipe road and send PID control unit to, PID control unit sends control signal according to flow information；Electric Proportion valve is installed on gas feeding pipe, adjusts gear according to control signal；And before liquid starts to drip, electric Proportion valve maintains a normally open state so that when liquid starts to drip, the speed of dripping of liquid is close to preset value.Before starting to drip at liquid, electric Proportion valve is always maintained at normally open, and Liquid storage container internal gas pressure is maximum；When liquid starts to drip, due to the biggest existing in Liquid storage container before air pressure, therefore the speed of dripping of liquid can reach preset value within a short period of time, shortens the transit time of phase of dripping, and reduces the waiting time.
Description
Technical field
The present invention relates to technical field of automation in industry, drip control particularly to a kind of liquid quantitative
System and method processed.
Background technology
Commercial production generally requires the consumption and interpolation adding materials each processing technique
Frequency etc. be controlled, the control of drip especially for liquid type material frequency and flow
System.Existing conventional liquid quantitative control system of dripping is broadly divided into following two type:
The first system can keep constant flow rate, and this system includes that flow regulator, pressure become
Send device, electric Proportion valve, Programmable Logic Controller and human-computer exchange machine, wherein pressure transmitter
Being arranged on the import and export of flow controller, pressure transmitter collects that analog signals is transferred to can
Programmable controller, by this analog signals, through analog digital conversion, (i.e. AD turns Programmable Logic Controller
Change) become digital quantity, and the parameter comparison arranged with human-computer exchange device calculates, and will calculate
Result be converted to analog output to electric Proportion valve, electric Proportion valve controls flow controller
Pressure ensure the size of outlet pressure, thus ensure the constant of fluid flow.
Fluid flow can be controlled by the second system, this system include delivery pump motor 1,
Current transformer 2, current sensor 3, converter CPU 4, echo signal are defeated
Entering end 5 and drive circuit 6, structural representation is as shown in Figure 1.Converter central authorities process single
Unit 4 receives what delivery pump motor 1 was come by current transformer 2 and current sensor 3 transmission
Signal, compares the echo signal that this signal and target signal input 5 input, and root
According to comparative result output control signal to drive circuit 6, control delivery pump by drive circuit 6
The operating frequency of motor 1.It is optimized by exchanging economize on electricity road, makes the running current of delivery pump
Stable at target set point, thus realize automatically controlling of transport pump flow, stable at a mesh
Mark setting value.
But for liquid crystal display industry, it is not required to liquid (such as alignment liquid
Polyimide, also referred to as PI liquid) constantly drip according to firm discharge, and need according to one
Fixed time interval is quantitatively dripped, and only controls under PI drop if directly utilizing the first system
The time interval (namely interval is to the transition period of spraying phase) that can realize is 1-2 minute,
But then cannot realize when time interval is less than 1 minute, i.e. the first system cannot
Meet the requirement of high precision time interval.Although system can realize the control to flow in second
System, but control process current transformer or current sensor there may be electric arc, electric spark or
Produce heat, it is impossible to the conveying of flammable liquid in liquid crystal display industry, therefore in prior art
Above two system be not all suitable for the dripping at regular time and quantity of flammable liquid in liquid crystal display industry
Lower control.
Summary of the invention
For solve existing system be not applied for flammable liquid at regular time and quantity drip control technology
Problem, on the one hand,
The invention provides a kind of liquid quantitative to drip control system, including:
Liquid storage container, PID PID control unit connect respectively with described Liquid storage container
Logical drain pipe road and gas feeding pipe；
Being provided with effusion meter on described drain pipe road, described effusion meter gathers in described drain pipe road
The flow information of liquid also sends described PID control unit to；
Described PID control unit sends control signal according to described flow information；
Being provided with electric Proportion valve on described gas feeding pipe, described electric Proportion valve is according to described control
Signal processed adjusts gear；And before liquid starts to drip, described electric Proportion valve keeps
Normally open so that liquid when starting to drip in described Liquid storage container the speed of dripping of liquid close
Preset value.
Optionally, described flow is calculated as ultrasonic flowmeter, in drain pipe road described in Real-time Collection
The flow information of liquid, as the speed of dripping of liquid in described Liquid storage container, obtains measured value,
And described measured value is sent to described PID control unit.
Optionally, described PID control unit includes parameter setting module, be used for the ratio that performs,
Integration, the programmable logic controller (PLC) PLC of differential and input/output module, described parameter sets
Module is dripped the preset value of speed for setting liquid, and described PLC is according to described preset value and institute
State measured value to compare and obtain operating value, and described operating value is passed through with the form of control signal
Described input/output module is sent to described electric Proportion valve.
Optionally, described drain pipe road being also equipped with switch, described switch receives described PID
Unlatching signal and the stopping signal of control unit control the break-make that liquid drips, wherein said
PID control unit sends and opens signal to sending the period stopped between signal is the phase of dripping, institute
Stating PID control unit and sending stopping signal is interval to sending the period opened between signal.
Optionally, described electric Proportion valve in the phase of dripping by the folding condition of described electric Proportion valve
Feed back to described control unit and store；Suspending the interval that liquid drips, described PID is controlled
Unit processed according to described electric Proportion valve the previous phase of dripping folding condition to described electrically
Proportioning valve sends control signal.
Optionally, described electric Proportion valve is reversal electric Proportion valve, drips reverse described in the phase
Type electric Proportion valve is in normally open, and described in interval, reversal electric Proportion valve is according to described
Operating value in control signal adjusts gear, thus adjusts the speed of dripping of liquid.
Optionally, also include that gas container, described gas container connect with described gas feeding pipe,
It is also equipped with pressure regulator valve on gas feeding pipe between described gas container and described electric Proportion valve,
For being adjusted into the gas pressure of described Liquid storage container.
Optionally, the gas in described gas container is noble gas.
On the other hand,
Present invention also offers a kind of liquid quantitative to drip control method, use above-described liquid
Body quantitatively drips control system, and before liquid starts to drip, electric Proportion valve maintains a normally open shape
State so that when liquid starts to drip in Liquid storage container the speed of dripping of liquid close to preset value.
Optionally, also include: also include: described electric Proportion valve the phase of dripping by described electrically
The folding condition of proportioning valve feeds back to PID control unit and stores；Between time-out liquid drips
Every the phase, described PID control unit according to described electric Proportion valve in the folding of previous phase of dripping
State sends control signal to described electric Proportion valve.
The liquid quantitative provided based on the present invention drips control system and method, in Liquid storage container
Before liquid starts to drip, electric Proportion valve is always maintained at normally open, Liquid storage container internal gas pressure
Maximum；When liquid starts to drip, due to the biggest existing in Liquid storage container before air pressure, therefore
The speed of dripping of liquid can reach preset value within a short period of time, shortens first and drips the phase
Transit time, reduce the waiting time, be conducive to improving efficiency.
Accompanying drawing explanation
Fig. 1 is that the second liquid quantitative provided in prior art drips the structural representation of system
Figure；
Fig. 2 is that a kind of liquid quantitative that embodiment one provides drips the structural representation of control system
Figure；
Fig. 3 is the composition schematic diagram of PID control unit in embodiment one；
Fig. 4 is the circuit diagram constituting PID/feedback in embodiment one；
Fig. 5 is reversal electric Proportion valve input-output characteristic figure in embodiment one.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention of the present invention is made the most in detail
Describe.Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
Embodiment one
Present embodiments provide a kind of liquid quantitative to drip control system, structural representation such as Fig. 2
Shown in, including:
Liquid storage container 100, PID PID control unit 200 and Liquid storage container 100
The drain pipe road 300 being respectively communicated with and gas feeding pipe 400；
Being provided with effusion meter 500 on drain pipe road 300, effusion meter 500 gathers drain pipe road 300
The flow information of middle liquid also sends PID control unit 200 to, PID control unit 200 basis
Flow information sends control signal；
Gas feeding pipe 400 has installed electric Proportion valve 600, and electric Proportion valve 600 is according to control
Signal adjusts gear；
Before liquid starts to drip, electric Proportion valve 600 maintains a normally open state so that liquid
When starting to drip in Liquid storage container 100 speed of dripping of liquid close to preset value.This means reservoir
Container 100 kept the certain air pressure equal with admission line before liquid starts to drip, from
And when making liquid start to drip in Liquid storage container 100 speed of dripping of liquid close to preset value,
In general it is slightly larger than or equal to preset value, is preferred more than 0% to the 20% of preset value.This area
It is to be understood by the skilled artisans that required air pressure size can be obtained by test.
It is also desirable to explanation, wherein drain pipe road 300 is entity pipeline, is used for arranging
Going out liquid, effusion meter 300 is arranged on drain pipe road 300, in order to speed of dripping liquid in real time
Detecting in real time, gas feeding pipe 400 is also entity pipeline, for defeated in Liquid storage container 100
Supply gas body, in order to drip the phase and the air pressure in Liquid storage container 100 is carried out by interval at liquid
Adjusting, speed of indirectly dripping liquid is adjusted；And effusion meter 300 and PID control unit 200
Between and electric Proportion valve 600 and PID control unit 200 between by holding wire or wireless
Mode be connected, be used for transmitting the signal of telecommunication, such as effusion meter 500 is as a kind of fluid flow
Sensor, can be transferred to PID control unit 200 by the signal of telecommunication of collection wirelessly.
Based on above-mentioned, before in Liquid storage container 100, liquid starts to drip, electric Proportion valve 600
Being always maintained at normally open, Liquid storage container 100 internal gas pressure is maximum；Liquid starts to drip, due to
Existing bigger air pressure in Liquid storage container 100 before, therefore the speed of dripping of liquid can be relatively
Preset value is reached in short time, and not to storage before prior art starts to drip due to liquid
Liquid container internal gas pressure is adjusted, and upon receiving the control signal, liquid can not immediately begin to drip
Under, but need wait Liquid storage container internal gas pressure increase to can with by liquid in Liquid storage container
Just having liquid when of extrusion to drip, therefore the phase of dripping really is able to waiting time of dripping relatively
Long.The present embodiment just can have liquid to start to drip the most immediately, shortens the
The transit time of one phase of dripping, reduce the waiting time on streamline, be conducive to improving flowing water
The working (machining) efficiency of line, thus improve production capacity.
In the present embodiment for the liquid in Liquid storage container 100 as a example by alignment liquid (PI liquid),
Two pipe interfaces, a pipe interface are had to connect into feed channel, be used on Liquid storage container 100
Gas is inputted in Liquid storage container 100；Another pipe interface connect liquid-transport pipe-line, for from
Liquid storage container 100 outwards oozes liquid.
Optionally, the effusion meter 300 in the present embodiment is preferably ultrasonic flowmeter, adopts in real time
In collection drain pipe road 300, the flow information of liquid is as the speed of dripping of liquid in Liquid storage container 100
Rate, obtains measured value, and this measured value is sent to PID control unit 200.Ultrasonic flow
Meter is a kind of contactless instrument, both can measure the fluid flow of Large Diameter Pipeline, it is also possible to be used for
It is difficult to the measurement of the liquid of contact and observation, especially for flammable liquid, measurement result simultaneously
Accuracy higher.
Optionally, the PID control unit 200 in the present embodiment is based on PID PID electricity
Road is controlled, and composition schematic diagram is as it is shown on figure 3, include parameter setting module 201, perform ratio
Example, integration, the programmable logic controller (PLC) PLC202 of differential and input/output module 203, ginseng
Number setting modules 201 drip the preset value of speed for setting liquid, and PLC202 is according to preset value
Setting operation value compared with measured value, and operating value is passed through input with the form of control signal
Output module 203 is sent to electric Proportion valve 600.
Preferably, the parameter setting module 201 in the present embodiment can be a personal-machine interface,
The preset value dripped by man machine interface infusion fluid, preset value herein refers to liquid and drips
Speed, i.e. can be by electric Proportion valve 600 to being input to the air pressure of liquid in Liquid storage container 100
It is adjusted, and then speed of dripping liquid is adjusted.Afterwards, PLC202 is according to parameter
The preset value that setting module 201 sends, flows to electric Proportion valve by input/output module 203
600.It should be noted that PID control unit 200 also includes: analog-to-digital conversion module 204
And D/A converter module 205, this preset value also needs to the modulus by analog-to-digital conversion module 204
Conversion (i.e. AD conversion) and the digital-to-analogue conversion (i.e. DA conversion) of D/A converter module 205
Afterwards, preset value is flowed to electric Proportion valve with the analog quantity corresponding to electric Proportion valve 600
600, in order to electric Proportion valve 600 can be according to this predetermined amount to being passed in Liquid storage container 100
Gas be controlled.
Optionally, drain pipe road 300 being also equipped with switching 310, switch 310 reception PID controls
Unlatching signal and the stopping signal of unit 200 control the break-make that liquid drips, wherein PID
Control unit 200 sends and opens signal to sending the period stopped between signal is the phase of dripping, PID
It is interval to sending the period opened between signal that control unit 200 sends stopping signal, i.e.
Drip the phase: open signal-stopping signal；Interval: stop signal-unlatching signal.See Fig. 1,
Can also be connected by holding wire between switch 310 and PID control units 200, further, PID
Control unit 200 is connected to electromagnetic valve (not shown) by holding wire, electromagnetic valve also with open
Close and connect so that unlatching signal and stopping signal that PID control unit 200 sends can also is that
Realized the control switching 310 break-makes by electromagnetic valve.When control signal sends, PID controls single
Unit 200 (particularly input/output module 203) send to electromagnetic valve and open signal, electromagnetic valve
Controlling switch 310 to open, the liquid in Liquid storage container 100 starts to drip, and the phase of dripping starts timing.
It addition, the time of the phase of dripping can also be set at parameter setting module 201, it
Time phase of dripping that rear PLC202 sends according to parameter setting module 201 sets timer, when
PLC202 is opened after signals to switch 310 transmission by input/output module 203, this timing
Device starts timing, is i.e. started timing the phase of dripping.The phase meter that drips is reached when the time that liquid drips
Time the time time, input/output module 203 to electromagnetic valve send stop signal, electromagnetic valve control open
Closing 310 closedowns, the liquid in Liquid storage container 100 stops dripping, and enters interval afterwards.
In the phase of dripping, the flow information of effusion meter 300 Real-time Collection liquid drips speed as liquid
Rate, i.e. measured value, and measured value is converted into curtage analogue signal, and by this electric current
Or voltage analog signal sends PID control unit 200 to, first PID control unit 200 is carried out
Analog digital conversion (A D conversion), is converted into digital quantity by the analog quantity that effusion meter 300 gathers and passes
Give PLC202.PLC202 carries out PID/feedback control according to measured value and preset value, passes through
Portfolio ratio action (P), integral action (I) and differential action (D) calculate operating value, make measured value
Rapidly, preset value is correctly leveled off to.Afterwards, calculated operating value is carried out digital-to-analogue to turn
Change (i.e. D/A conversion), operating value is converted into corresponding to electric Proportion valve 600 by digital quantity
Analog quantity, and send electric Proportion valve 600 to.Electric Proportion valve 600 is by controlling to reservoir appearance
Device 100 carries gas to change Liquid storage container 100 internal gas pressure, reaches to control liquid in Liquid storage container
The purpose of speed of dripping.
Wherein PID is calculated by portfolio ratio action (P), integral action (I) and differential action (D)
Operating value specifically includes:
When measured value PV of effusion meter 300 increases with the difference of preset value SV, increase operating value
MV, promptly makes measured value PV of effusion meter 300 level off to preset value SV；
When measured value PV of effusion meter 300 diminishes with the difference of preset value SV, reduce operating value
MV, gently, correctly by measured value PV is adjusted to identical with preset value SV.
Wherein carry out the circuit diagram of PID/feedback as shown in Figure 4, single except including that PID controls
PLC202, effusion meter 500, electric Proportion valve 600 and Liquid storage container 100 in unit 200,
PID control unit 200 also includes: be connected between electric Proportion valve 600 and PLC202
Analog-to-digital conversion module 204, and it is connected to the digital-to-analogue conversion between effusion meter 500 and PLC202
Module 205.
Optionally, electric Proportion valve 600 in the phase of dripping by anti-for the folding condition of electric Proportion valve 600
PID control unit 200 of feeding also stores；Suspending the interval that liquid drips, PID controls single
Unit 200 according to electric Proportion valve 600 at the folding condition of previous phase of dripping to electric Proportion valve
600 send control signal.Concrete, the analogue signal of electric Proportion valve 600 folding condition is passed through
Feed back to PLC202, PLC202 after becoming digital quantity signal after A/D conversion the phase of dripping is received
To electric Proportion valve 600 feedback digital quantity signal store, after the phase of dripping between
Also control the folding condition of electric Proportion valve 600 according to this digital quantity signal every the phase, the most permissible
Enable no matter the air pressure in Liquid storage container 100 keeps basic phase in the phase of dripping or interval
With, do not have bigger change, when entering into the phase of dripping in next control cycle, drip
The transition period of next period is the most effectively shortened, it is to avoid occur due to transition period oversize nothing
Method realizes the problem dripped in interval.
Optionally, electric Proportion valve 600 is reversal electric Proportion valve, its input-output characteristic
As shown in Figure 4, when i.e. input signal is 0, rated pressure is maximum, along with the increasing of input signal for figure
Greatly, rated pressure is gradually reduced, and wherein input signal is the control of PID control unit 200 conveying
Signal, sees Fig. 4, and when input signal is 100, rated pressure is reduced to 0.Drip the phase, electrically
Proportioning valve 600 is in normally open；Interval, electric Proportion valve 600 is according in control signal
Operating value adjustment gear, thus the speed of dripping of liquid in Indirect method Liquid storage container 100.
Optionally, the system in the present embodiment also includes gas container 700, gas container 700
Connect with gas feeding pipe 400, the gas feeding pipe between gas container 700 and electric Proportion valve 600
Pressure regulator valve 800 it is also equipped with, for being adjusted into the gas pressure of Liquid storage container 100 on 400.
Optionally, the gas in gas container 700 is noble gas, in the present embodiment preferably
Noble gas is nitrogen (i.e. N2).Because the 78.12% of the volume fraction duty gas total amount of nitrogen,
Produce easily, and nitrogen has chemical inertness, be difficult under room temperature and other material occurs chemistry
Reaction, uses N2The output safety that drips controlling flammable liquid is reliable.For being difficult to occur with gas
Whether it is that noble gas is not restricted to the gas in gas container 700 for the liquid of reaction.
It should be noted that the present embodiment is only as a example by PI liquid, then in gas container
Gas can select nitrogen.But the system that the present embodiment provides is also same for other flammable liquid
Sample is suitable for, and all can avoid being affected by the electric spark in liquid output procedure etc..
In sum, the liquid quantitative using the present embodiment to provide drips controlling party system, in storage
Before in liquid container, liquid starts to drip, electric Proportion valve is always maintained at normally open, and reservoir is held
Device internal gas pressure is maximum；When the switch is opened, state is opened by closing to switch to rapidly, and liquid is opened
Beginning drips, due to the biggest existing in Liquid storage container before air pressure, the therefore speed of dripping of liquid
Preset value can be reached within a short period of time, it is possible to realize the fixing quantity that liquid is dripped, contracting
The transit time of short first phase of dripping, reduce the waiting time, be conducive to improving efficiency.Meanwhile,
Interval also according to the phase of dripping digital quantity signal control electric Proportion valve folding condition, because of
This can enable no matter the air pressure in Liquid storage container keeps basic in the phase of dripping or interval
Identical, it is to avoid in Liquid storage container, pressure does not haves greatly when the phase of dripping and interval change
Change, when entering into the phase of dripping in next control cycle, the transition period of phase of dripping equally may be used
Effectively to be shortened, it is to avoid occur cannot realizing being spaced asking of dripping owing to the transition period is oversize
Topic, therefore can realize quantitatively dripping liquid timing (according to time interval) in Liquid storage container
It is controlled.
Embodiment two
Based on said system, the present embodiment additionally provides a kind of liquid quantitative and drips control method,
Including:
Before liquid starts to drip, electric Proportion valve maintains a normally open state so that liquid starts
When dripping in Liquid storage container the speed of dripping of liquid close to preset value.Afterwards, when switch is opened,
Liquid starts to drip, due to the biggest existing in Liquid storage container before air pressure, and therefore the dripping of liquid
Lower speed can reach preset value within a short period of time, it is possible to realizes the quantitative dripping liquid
System, shortens the transit time of first phase of dripping, and reduces the waiting time, is conducive to improving efficiency.
Optionally, also include: electric Proportion valve in the phase of dripping by the folding condition of electric Proportion valve
Feed back to control unit and store；Suspending the interval that liquid drips, PID control unit
Control is sent to electric Proportion valve according to the electric Proportion valve folding condition in the previous phase of dripping
Signal.So can enable no matter the air pressure in Liquid storage container is protected in the phase of dripping or interval
Hold essentially identical, it is to avoid in Liquid storage container, pressure does not haves when the phase of dripping and interval change
Bigger change, when entering into the phase of dripping in next control cycle, the transition period of phase of dripping
The most effectively shortened, it is to avoid occur that cannot realize interval drips owing to the transition period is oversize
Under problem, it is fixed therefore can to realize liquid timing (according to time interval) in Liquid storage container
Amount is dripped and is controlled.
Based on above-mentioned, the present embodiment is capable of the technique effect identical with embodiment one, herein
Repeat no more.
Certainly, function based on system and the characteristic of each composition device, the method in the present embodiment
Can also include that setting liquid by the parameter setting module of PID control unit drips the pre-of speed
If value, by pressure regulator valve adjust air pressure, liquid drip period adjusted by PID control unit
Liquid speed of dripping, to setting value etc., does not repeats them here.
Embodiment of above is merely to illustrate the present invention, and not limitation of the present invention, relevant
The those of ordinary skill of technical field, without departing from the spirit and scope of the present invention,
Can also make a variety of changes and modification, the technical scheme of the most all equivalents falls within the present invention
Category, the scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. a liquid quantitative drips control system, it is characterised in that including: Liquid storage container,
Drain pipe road that PID PID control unit and described Liquid storage container are respectively communicated with and
Gas feeding pipe；
Being provided with effusion meter on described drain pipe road, described effusion meter gathers in described drain pipe road
The flow information of liquid also sends described PID control unit to；
Described PID control unit is for sending control signal according to described flow information；
Being provided with electric Proportion valve on described gas feeding pipe, described electric Proportion valve is according to described control
Signal processed adjusts gear；And before liquid starts to drip, described electric Proportion valve keeps
Normally open so that liquid when starting to drip in described Liquid storage container the speed of dripping of liquid close
Preset value.
2. the system as claimed in claim 1, it is characterised in that described flow is calculated as ultrasound wave
Effusion meter, in drain pipe road described in Real-time Collection, the flow information of liquid is as described Liquid storage container
The speed of dripping of interior liquid, obtains measured value, and described measured value is sent to described PID control
Unit processed.
3. system as claimed in claim 2, it is characterised in that described PID control unit bag
Include parameter setting module, for performing the programmable logic controller (PLC) PLC of ratio, integration, differential
And input/output module, described parameter setting module for set liquid drip speed preset
Value, described PLC obtains operating value according to described preset value compared with described measured value, and will
Described operating value is sent to described electricity with the form of control signal by described input/output module
Gas proportioning valve.
4. the system as claimed in claim 1, it is characterised in that also pacify on described drain pipe road
Equipped with switch, described switch receives the unlatching signal of described PID control unit and stops signal
Controlling the break-make that liquid drips, wherein said PID control unit sends opens signal to sending
The period stopped between signal is the phase of dripping, and described PID control unit sends and stops signal to sending out
Sending the period opened between signal is interval.
5. system as claimed in claim 4, it is characterised in that described electric Proportion valve is dripping
The folding condition of described electric Proportion valve is fed back to described control unit and stores by the next period；Temporarily
Stop the interval that liquid drips, described PID control unit according to described electric Proportion valve previous
The folding condition of individual phase of dripping sends control signal to described electric Proportion valve.
6. system as claimed in claim 4, it is characterised in that described electric Proportion valve is anti-
To type electric Proportion valve, the reversal electric Proportion valve described in the phase that drips is in normally open, interval
Reversal electric Proportion valve described in phase adjusts gear according to the operating value in described control signal, from
And adjust the speed of dripping of liquid.
7. the system as claimed in claim 1, it is characterised in that also include gas container, institute
State gas container to connect with described gas feeding pipe, described gas container and described electric Proportion valve it
Between gas feeding pipe on be also equipped with pressure regulator valve, for adjust from entering into described Liquid storage container
Gas pressure.
8. system as claimed in claim 7, it is characterised in that the gas in described gas container
Body is noble gas.
9. a liquid quantitative drips control method, it is characterised in that use claim 1-8
According to any one of liquid quantitative drip control system, before liquid starts to drip, electrically
Proportioning valve maintains a normally open state so that the speed of dripping of liquid in Liquid storage container when liquid starts to drip
Rate is close to preset value.
10. method as claimed in claim 9, it is characterised in that also include: described electrically
The folding condition of described electric Proportion valve is fed back to PID control unit also in the phase of dripping by proportioning valve
Storage；Suspending the interval that liquid drips, described PID control unit is according to described electric ratio
The example valve folding condition in the previous phase of dripping sends control signal to described electric Proportion valve.
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| CN203070113U (en) * | 2012-12-17 | 2013-07-17 | 中山Dic色料有限公司 | Automatic adhesive flow monitoring and controlling device after emulsification procedure |
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2014
- 2014-09-19 CN CN201410484264.9A patent/CN104216426B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1592844A (en) * | 2001-11-26 | 2005-03-09 | 美国艾默生电气公司 | High purity fluid delivery system |
| JP2012103812A (en) * | 2010-11-08 | 2012-05-31 | Horiba Stec Co Ltd | Mass flow controller |
| CN202975846U (en) * | 2012-11-26 | 2013-06-05 | 浙江泛泰仪器有限公司 | Gas flow controller based on PID algorithm |
| CN203070113U (en) * | 2012-12-17 | 2013-07-17 | 中山Dic色料有限公司 | Automatic adhesive flow monitoring and controlling device after emulsification procedure |
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