CN207008419U - Delicate flow control system - Google Patents
Delicate flow control system Download PDFInfo
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- CN207008419U CN207008419U CN201720774931.6U CN201720774931U CN207008419U CN 207008419 U CN207008419 U CN 207008419U CN 201720774931 U CN201720774931 U CN 201720774931U CN 207008419 U CN207008419 U CN 207008419U
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Abstract
It the utility model is related to a kind of delicate flow control system, the delivery outlet of platen feeding engine is connected by pipeline with the entrance of this system, flowed to according to liquid, this system includes flowmeter, pressure gauge one, valve and pressure gauge two, the system also includes control valve and controller, this system utilizes bar gate type Valve controlling liquid outlet footpath, liquid flowing state is monitored by flowmeter and pressure gauge in real time and valve aperture is adjusted accordingly, solve and cause abrasion of particles and the technical problem for blocking the pump housing in liquid in quantitative manner output liquid designed using mechanical pump in the prior art.
Description
Technical field
It the utility model is related to liquid conveying system, more particularly to delicate flow control system.
Background technology
Liquid conveying is to commonly use production technology in the industrial production, but the stabilization exported in many high request occasions to liquid
Property have very high requirement, as pressure will be stablized or flow will be stablized, because the input source of liquid in most cases is all more general
Logical conveying equipment, stability contorting can not be carried out to pressure or flow, pressure or flow have very big fluctuation, institute when in use
So that the requirement of stable output can not be met.
In order to meet the stability of liquid conveying, at present, common method is to utilize the designed quantitative manner of mechanical pump such as
Gear utilizes motor driven, promotes liquid to export by motor uniform rotation.Mechanical pump utilizes motor driven, by motor at the uniform velocity
Rotate and promote liquid output, if filler can excessively make the lost of life of mechanical constant displacement pump many in this method liquid, because
Pump body is the original papers such as gear, screw rod and piston, and the liquid that there is granular filler inside can make the appearance of gear, screw rod and piston
Surface wear, particle is excessive also to block the pump housing.
Utility model content
The purpose of this utility model is to provide a kind of delicate flow control system, and this system utilizes bar gate type Valve controlling
Liquid outlet footpath, liquid flowing state is monitored by flowmeter and pressure gauge in real time and valve aperture adjusted accordingly
It is whole, solve caused in the prior art in quantitative manner output liquid designed using mechanical pump in liquid abrasion of particles and
Block the technical problem of the pump housing.
In order to solve the above problems, the utility model provides a kind of delicate flow control system, platen feeding engine it is defeated
Outlet be connected by pipeline with the entrance of this system, flowed to according to liquid, this system including flowmeter, pressure gauge one, valve and
Pressure gauge two, the system also include control valve and controller：
The flowmeter is arranged between the platen feeding engine and valve, gathers the flow velocity and flow of liquid in pipeline；
The pressure gauge one is arranged on the entrance of the valve, gathers the valve inlet pressure；
The pressure gauge two is arranged on the outlet of the valve, gathers the valve export pressure；
The control valve is connected with the valve, adjusts the size of the valve；
The control valve, the pressure gauge one, pressure gauge two and flowmeter are electrically connected with controller, the controller
Valve is controlled using the collection of the analog quantity of PLC and fan-out capability and PID controller control analog output
Open size, while and gather two pressure gauges pressure state adjust in good time.
It is described outer according to the delicate flow control system described in the application preferred embodiment, in addition to external trigger module
Portion's trigger module is connected with the controller, the enabling signal that triggering the system is started working.
According to the delicate flow control system described in the application preferred embodiment, the external trigger module is relay.
According to the delicate flow control system described in the application preferred embodiment, in addition to fault alarm module, the event
Barrier alarm module is connected with the controller, external output signal during the system failure.
According to the delicate flow control system described in the application preferred embodiment, the fault alarm module is buzzer.
According to the delicate flow control system described in the application preferred embodiment, spring bulb is additionally arranged at the bottom in the valve
To balance the switch dynamics of the valve.
According to the delicate flow control system described in the application preferred embodiment, the control valve is air-operated solenoid valve.
According to the delicate flow control system described in the application preferred embodiment, the PID controller is by proportional unit
(P), integral unit (I) and differentiation element (D) form, and it inputs e (t) and output u (t) relation is：
U (t)=kp [e (t)+1/TI ∫ e (t) dt+TD*de (t)/dt], the bound integrated in formula are 0 and t respectively,
Therefore, its transmission function is：G (s)=U (s)/E (s)=kp [1+1/ (TI*s)+TD*s]
Wherein kp is proportionality coefficient；TI is integration time constant；TD is derivative time constant.
PID controller is exactly the error according to system, and proportion of utilization, integration, difference gauge calculate what controlled quentity controlled variable was controlled.
Compared with prior art, there is following technique effect in the utility model：
The utility model provides a kind of delicate flow control system, and this system utilizes bar gate type Valve controlling liquid outlet
Footpath, liquid flowing state is monitored by flowmeter and pressure gauge in real time and valve aperture is adjusted accordingly, this system is not
Be afraid of the granular filler of liquid internal, will not block, wearability is than other several times of pump long lifespans or more.The technical program is in industry
To liquid, the adjustment of corresponding flow and flow rate is made in pressure and constantly control during changes in flow rate in the duct in production, meets
Stable output requirement.
Brief description of the drawings
Fig. 1 is a kind of delicate flow control system of the utility model and the attachment structure schematic diagram of platen feeding engine；
Fig. 2 is a kind of structural representation of delicate flow control system of the utility model；
Fig. 3 is a kind of workflow diagram of delicate flow control system of the utility model；
Fig. 4 is a kind of circuit diagram of delicate flow control system of the utility model.
Embodiment
Below in conjunction with accompanying drawing, lift a specific embodiment and described in detail.
A kind of delicate flow control system, refer to Fig. 1, and the delivery outlet of platen feeding engine 2 passes through pipeline and this system 1
Entrance connects, in the present embodiment, the up and down reciprocatingly plunger type feeding of platen feeding engine 1 (fluid pressure and discharge stability are poor, but
Resistance to filling and discharge pressure is big), refer to Fig. 2, flowed to according to liquid, this system include flowmeter 11, pressure gauge 1,
Valve 13 and pressure gauge 2 14 (i.e. the most advanced gauge 11 that becomes a mandarin of liquid, flows through pressure gauge 1, valve 13, and from pressure gauge two
14 outflows), this system also includes control valve 15 and controller, and specific annexation is as follows：
Flowmeter 11 is arranged between platen feeding engine 2 and valve 13, gathers the flow velocity and flow of liquid in pipeline；
Pressure gauge 1 is arranged on the entrance of valve 13, gathers the inlet pressure of valve 13；
Pressure gauge 2 14 is arranged on the outlet of valve 13, gathers the outlet pressure of valve 13；
Control valve 15 is connected with valve 13, the size of control valve 13；
Control valve 15, pressure gauge 1, pressure gauge 2 14 and flowmeter 11 are electrically connected with controller, and controller utilizes
The collection of the analog quantity of PLC and fan-out capability and PID controller control analog output are controlled opening for valve 13
Open size, while and gather the pressure states of two pressure gauges and adjust in good time.
In the present embodiment, this system also includes external trigger module, and external trigger module is connected with controller, and triggering is originally
The enabling signal of system starts.The preferred relay of external trigger module.
In the present embodiment, this system also includes fault alarm module, and the fault alarm module connects with the controller
Connect, external output signal during the system failure.The preferred buzzer of fault alarm module.
The switch dynamics that spring bulb carrys out compensation flap 13 is additionally arranged at the bottom in valve 13, valve 13 can be made there was only on and off
Two states become the state of adjustable switch size；15 preferred air-operated solenoid valve of control valve, is inputted with air-operated solenoid valve
The air-compressed gas of arbitrary size carries out sequencing Digital Control valve 13, with reference to the Intelligent Control Strategy of programmed algorithm makes pipe
Fluid pressure and flow in road reach a perfect condition.
It refer to Fig. 3, the workflow of the system：Liquid enter pressure and flow during pipeline be it is unstable,
The state in pipeline is gathered by flow pressure meter to be adjusted with PID industrial control methods come dynamic regulation valve, adjusting method
The size of valve.
Fig. 4 is refer to, controller is utilized using the collection of cyclelog PLC analog quantity and fan-out capability and improves PID
The unlatching size of algorithm control analog output control valve 13, while and gather the pressure states of two pressure gauges and adjust in good time
It is whole.
Delicate flow control method：
Working method (pressure or flow) pattern that control system selects according to user, system can be carried out according to mode of operation
PID closed-loop controls.Closed-loop automatic control technology is all based on the concept of feedback to reduce uncertainty.The key element bag of feedback theory
Include three parts：Measure, compare and perform.The actual value of crucially controlled variable is measured, compared with desired value, uses this
Deviation carrys out the response of correcting system, performs adjustment control.In engineering in practice, the adjuster control law being most widely used is
Ratio, integration, differential control, the regulation of abbreviation PID control, also known as PID.
PID controller (proportional-integral derivative controller) is a common backfeed loop portion in Industry Control Application
Part, it is made up of proportional unit P, integral unit I and differentiation element D.The basis of PID control is ratio control；Integration control can disappear
Except steady-state error, but overshoot may be increased；Differential control can accelerate Great inertia system response speed and weaken overshoot trend.
This it is theoretical and application it is crucial that make correctly measurement and relatively after, how could preferably correcting system.
PID (ratio (proportion), integration (integral), derivative (derivative)) controller is as real earliest
Currently still it is most widely used industrial control unit (ICU) with the existing last 100 yearses history of the controller of change.PID controller is simply easy
Understand, the prerequisites such as accurate system model are not required in use, thus as the controller being most widely used.
PID controller is made up of proportional unit (P), integral unit (I) and differentiation element (D).It inputs e (t) and output u
(t) relation is：
U (t)=kp [e (t)+1/TI ∫ e (t) dt+TD*de (t)/dt], the bound integrated in formula are 0 and t respectively,
Therefore, its transmission function is：G (s)=U (s)/E (s)=kp [1+1/ (TI*s)+TD*s]
Wherein kp is proportionality coefficient；TI is integration time constant；TD is derivative time constant.
PID controller is exactly the error according to system, and proportion of utilization, integration, difference gauge calculate what controlled quentity controlled variable was controlled.
Ratio (P) controls
Ratio control is a kind of simplest control mode.The output of its controller pass proportional to input error signal
System.When only proportional control there is steady-state error in system output.
Integrate (I) control
In integration control, the output of controller and the integration of input error signal are proportional.To an automatic control
System processed, if steady-state error be present after stable state is entered, it is to have steady-state error or referred to as have difference to claim this control system
System.In order to eliminate steady-state error, must be introduced into the controller " integral term ".Integral term depends on the product of time to error
Point, increase over time, integral term can increase.So, even if error very little, integral term can also be increased over time and added
Greatly, it promotes the output increase of controller steady-state error is further reduced, until equal to zero.Therefore, proportional+integral (PI) is controlled
Device processed, it can make system after stable state is entered without steady-state error.
Differential (D) controls
In differential control, the output of controller pass directly proportional to the differential (i.e. the rate of change of error) of input error signal
System.Automatic control system is during the regulation of error is overcome it is possible that vibration even unstability.Its reason is due to presence
There is larger inertia component (link) or have hysteresis (delay) component, have the function that to suppress error, its change always lags behind mistake
The change of difference.Solution is the change " advanced " for the effect for making suppression error, i.e., when error is close to zero, suppresses error
Effect should be just zero.In other words, it is often inadequate only to introduce " ratio " item in the controller, and the effect of proportional is only
The amplitude of fault in enlargement, and it is " differential term " to need at present increased, it can predict the trend of error change, so, have than
The controller of example+differential, it becomes possible to the control action of suppression error is equal to zero in advance, even negative value, so as to avoid by
The serious overshoot of control amount.So to there is the controlled device of larger inertia or hysteresis, ratio+differential (PD) controller can improve system
Dynamic characteristic during regulation.
Disclosed above is only the specific embodiment of the application, but the application is not limited to this, any this area
Technical staff can think change, should all fall in the protection domain of the application.
Claims (7)
1. a kind of delicate flow control system, the delivery outlet of platen feeding engine is connected by pipeline with the entrance of this system, and it is special
Sign is, is flowed to according to liquid, and this system includes flowmeter, pressure gauge one, valve and pressure gauge two, and the system also includes control
Valve and controller processed：
The flowmeter is arranged between the platen feeding engine and valve, gathers the flow velocity and flow of liquid in pipeline；
The pressure gauge one is arranged on the entrance of the valve, gathers the valve inlet pressure；
The pressure gauge two is arranged on the outlet of the valve, gathers the valve export pressure；
The control valve is connected with the valve, adjusts the size of the valve；
The control valve, the pressure gauge one, pressure gauge two and flowmeter are electrically connected with controller, and the controller utilizes
The collection of the analog quantity of PLC and fan-out capability and PID controller control analog output are controlled the unlatching of valve
Size, while and gather two pressure gauges pressure state adjust in good time.
2. delicate flow control system as claimed in claim 1, it is characterised in that described outer also including external trigger module
Portion's trigger module is connected with the controller, the enabling signal that triggering the system is started working.
3. delicate flow control system as claimed in claim 2, it is characterised in that the external trigger module is relay.
4. delicate flow control system as claimed in claim 1 or 2, it is characterised in that described also including fault alarm module
Fault alarm module is connected with the controller, external output signal during the system failure.
5. delicate flow control system as claimed in claim 4, it is characterised in that the fault alarm module is buzzer.
6. delicate flow control system as claimed in claim 1, it is characterised in that be additionally arranged at the bottom spring bulb in the valve
To balance the switch dynamics of the valve.
7. delicate flow control system as claimed in claim 1, it is characterised in that the control valve is air-operated solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720774931.6U CN207008419U (en) | 2017-06-29 | 2017-06-29 | Delicate flow control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720774931.6U CN207008419U (en) | 2017-06-29 | 2017-06-29 | Delicate flow control system |
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| CN207008419U true CN207008419U (en) | 2018-02-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107239080A (en) * | 2017-06-29 | 2017-10-10 | 上海盛普机械制造有限公司 | Delicate flow control system |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107239080A (en) * | 2017-06-29 | 2017-10-10 | 上海盛普机械制造有限公司 | Delicate flow control system |
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Address after: 201600 floor 2, building 39, No. 615, Lianhe Road, Chedun Town, Songjiang District, Shanghai Patentee after: Shanghai Shengpu fluid equipment Co.,Ltd. Address before: Building 5, E District, 6 South Chong Road, Songjiang District science and Technology Park, Shanghai Patentee before: SHANGHAI SHENGPU MACHINERY MANUFACTURING CO.,LTD. |