CN104375520A - Device and method for automatically stabilizing water flow - Google Patents
Device and method for automatically stabilizing water flow Download PDFInfo
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- CN104375520A CN104375520A CN201410638120.4A CN201410638120A CN104375520A CN 104375520 A CN104375520 A CN 104375520A CN 201410638120 A CN201410638120 A CN 201410638120A CN 104375520 A CN104375520 A CN 104375520A
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Abstract
The invention provides a device and method for automatically stabilizing water flow. Water circulates in a circulation water tank loop; the flow is adjusted to be 90%-110% of the set flow rapidly; a PID module of an adjusting valve is started, and the flow is adjusted by adjusting the opening degree of the PID module; the flow is stably adjusted under combined action of a variable frequency pump and the adjusting valve; after the flow is adjusted to be 98%-102% of the set flow, a reverser carries out reversing to be at the position of a weighing water tank, and a frequency meter records the number of pulses generated by a flow meter; after the weighing value of an electronic balance reaches the rated weight value, the reverser reverses to the position of an inlet of a circulation water tank, and the frequency meter stops counting. By adoption of the device and method for automatically stabilizing the water flow, detection can be carried out in a high-stability flow state, uncertainty of the flow stability can reach 0.04%, it is ensured that the flow meter works under the same flow coefficient, and the metering performance of the flow meter is guaranteed.
Description
Technical field
The invention belongs to fluid flow or volumetric metering technical field, be specifically related to a kind of device and method of autostable discharge.
Background technology
Flow metering be measuring science want ingredient most, be widely applied in each field.Meter proof is the calibrating of some constant flow point of flow meter, and when flow metering, stablizing of necessary guaranteed flow height, whole device is in metering process, and flow must control within the error range allowed, to ensure the reliability of verification result.
The method for stabilizing voltage of current water flow standard apparatus can be divided into water tower voltage stabilizing method, pressurizing vessel method, frequency conversion voltage stabilizing method etc. substantially.
(1) water tower voltage stabilizing method is that it can obtain good fluid stability using the high-order water tower of permanent liquid level as constant voltage water source, but it the has shortcoming such as the ram pressures provided is limited, water tower floor area is large and cost of erection is expensive.
(2) pressurizing vessel method, be water and gas are incorporated in same container, bottom is by water supplying pump, there is pressurized air on top as gas source feed, is regulated the pressure in container by gas in real time, ensures pressure stability, when flow is less, it has the features such as small investment, floor area be little.But when examining and determine for large discharge, container volume is very large, and the high pressure vessel of large volume is dangerous, and needs to configure a large amount of pressurized air, and the time of device voltage stabilizing is also longer.
(3) frequency conversion voltage stabilizing method is controlled frequency by changing variable frequency pump thus realize adjustment to flow, and its floor area is little, small investment, high-lift pump can be selected to improve ram pressures, but its discharge stability is not as the above two.
Summary of the invention
The invention provides that a kind of floor area is little, the flow control that realizes high stability, autostable discharge that automaticity is high device and method.
Realize the technical scheme of the object of the invention: a kind of device of autostable discharge, it comprises cyclic water tank, and cyclic water tank side connects cyclic water tank water intaking valve by pipeline, and opposite side connects variable frequency pump by pipeline; Variable frequency pump connects buffer tank by pipeline, and buffer tank is by pipeline connection traffic meter, and flowmeter connects the rising pipe be arranged on above commutator by pipeline; Flowmeter arranges frequency meter;
Above cyclic water tank, arrange electronic scales, water tank of weighing placed by electronic scales, and water tank side of weighing is cyclic water tank entrance; Commutator is arranged on weigh water tank and cyclic water tank entrance top, and rising pipe is arranged on above commutator, and this rising pipe side is with optoelectronic switch; Be provided with water delivering orifice bottom commutator, carry out position conversion by commutator, the water that rising pipe is flowed out its only flow into cyclic water tank entrance or only flow into and to weigh water tank.
The device of a kind of autostable discharge as above, it is provided with in water tank side of weighing the discharge pipe line be communicated with cyclic water tank, and this discharge pipe line arranges water tank drain valve of weighing; Cyclic water tank is provided with cyclic water tank liquid level gauge; The pipeline that cyclic water tank is connected with variable frequency pump is provided with pump intake valve; Variable frequency pump and the tank connected pipeline of voltage stabilizing are provided with pump discharge valve; The pipeline that buffer tank is connected with flowmeter is provided with flowmeter inlet valve; The pipeline that flowmeter is connected with rising pipe is provided with variable valve.
The device of a kind of autostable discharge as above, optoelectronic switch described in it, water tank drain valve of weighing, electronic scales, pump intake valve, cyclic water tank water intaking valve, variable frequency pump, pump discharge valve. flowmeter inlet valve, frequency meter, flowmeter and variable valve are field apparatus, these field apparatuss are connected with programmable logic controller (PLC) respectively by circuit, and programmable logic controller (PLC) is undertaken by Industrial Ethernet and human-computer interaction interface alternately.
The device of a kind of autostable discharge as above, human-computer interaction interface described in it adopts two-shipper configuration, after a deadlock, another still can operate, it is responsible for the instruction receiving user's input and user's transmission, utilize modbus/TCP communication protocol, carry out alternately through Industrial Ethernet and programmable logic controller (PLC), all logics are in programmable logic controller (PLC), it receives the signal of field apparatus, and control field apparatus, all kinds of for present equipment state transfer is shown to human-computer interaction interface.
The device of a kind of autostable discharge as above, the programmable logic controller (PLC) described in it by digital quantity card control field apparatus, i.e. the switch of valve, the start and stop of pump, the position conversion of commutator; By the frequency of analog output card control variable frequency pump and the aperture of variable valve; What flowmeter returned is pulse value, is gathered by frequency meter, and records accumulated pulse number and be scaled integrated flow, and by timer interrupt mode, the umber of pulse in record 1s, is scaled instantaneous delivery.
The method of a kind of autostable discharge of the present invention, it comprises the steps:
A () ON cycle tank intake valve of water, makes liquid level in cyclic water tank be 80% ~ 90% of its full liquid level; Open pump intake valve, variable frequency pump, pump discharge valve, the liquid level of buffer tank is adjusted, ensure that in buffer tank, liquid level is 80% ~ 90% of its full liquid level; Turn-on flow rate meter inlet valve, variable valve, commutator changes and is transformed into cyclic water tank porch, realizes water and circulates in cyclic water tank loop;
B (), using flowmeter flow as real-time traffic, changes the frequency of variable frequency pump by pid algorithm, as shown in Figure 3, adjusted to by flow in 90% ~ 110% scope of setting flow fast; Flow is adjusted to after in 90% ~ 110% scope, enabling the PID module of variable valve, by adjusting its aperture, regulating flow; In the acting in conjunction of variable frequency pump and variable valve, realize the stable regulation of flow;
(c) flow adjust to setting flow 98% ~ 102% scope in after, electronic scales is removed the peel, frequency meter resets, commutator is carried out commutating to water tank location place of weighing, optoelectronic switch can be triggered during commutation, when programmable logic controller (PLC) receives the first time pulse signal of optoelectronic switch, the simultaneously umber of pulse that sends of frequency meter recording flowmeter;
D (), after electronic scale weighing arrives rated weight, commutator gains cyclic water tank porch, now optoelectronic switch produces second time pulse signal, and frequency meter stops counting;
Accumulated pulse number in (e) reading frequency meter and time, read the value of weighing of electronic scales; Unlatching is weighed water tank drain valve, closes after draining;
The method of a kind of autostable discharge as above, it comprises the steps (f), namely (f) repeat step (b) to step (e) complete same calibrating point 3 times calibrating after, calculate one calibrating point average discharge.
The method of a kind of autostable discharge as above, it comprises the steps (g), and namely (g) repeats step (b) to step (f), until the calibrating point of all inputs has all been examined and determine, off-test.
Effect of the present invention is: autostable water flow device of the present invention realizes the flow control of high stability, for high-precision meter proof lays good basis.Adopt the method for the autostable water yield of the present invention, can carry out calibration operation under the flow status of high stable, the uncertainty of stability of flow degree can reach 0.04%, ensure that flowmeter works under same flow coefficient of discharge, guarantees the metering performance of flowmeter.The present invention realizes quick adjustment, improves efficiency; Operating process robotization, at human-computer interaction interface, after input calibrating point, clicks and starts, terminate, without the need to human intervention, avoid the error that human operational error brings until cautious.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram of a kind of autostable discharge of the present invention;
Fig. 2 is control system schematic diagram;
Fig. 3 is that PID regulates schematic diagram;
In figure: 1. optoelectronic switch; 2. commutator; 3. to weigh water tank; 4. to weigh water tank drain valve; 5. electronic scales; 6. cyclic water tank liquid level gauge; 7. pump intake valve; 8. cyclic water tank; 9. cyclic water tank water intaking valve; 10. variable frequency pump; 11. pump discharge valves; 12. buffer tanks; 13. flowmeter inlet valves; 14. frequency meters; 15. flowmeters; 16. variable valve; 17. rising pipes; 18. cyclic water tank entrances; 19. human-computer interaction interfaces; 20. Industrial Ethernet; 21. programmable logic controller (PLC)s.
Embodiment
Be further described below in conjunction with the device and method of the drawings and specific embodiments to a kind of autostable discharge of the present invention.
Embodiment 1
As shown in Figure 1, the device of a kind of autostable discharge of the present invention, it comprises cyclic water tank 8, and cyclic water tank 8 side connects cyclic water tank water intaking valve 9 by pipeline, and opposite side connects variable frequency pump 10 by pipeline.Cyclic water tank 8 is provided with cyclic water tank liquid level gauge 6; The pipeline that cyclic water tank 8 is connected with variable frequency pump 10 is provided with pump intake valve 7.
Variable frequency pump 10 connects buffer tank 12 by pipeline, and buffer tank 12 is by pipeline connection traffic meter 15, and flowmeter 15 connects the rising pipe 17 be arranged on above commutator 2 by pipeline; Flowmeter 15 arranges frequency meter 14.The pipeline that variable frequency pump 10 is connected with buffer tank 12 is provided with pump discharge valve 11; The pipeline that buffer tank 12 is connected with flowmeter 15 is provided with flowmeter inlet valve 13; The pipeline that flowmeter 15 is connected with rising pipe 17 is provided with variable valve 16.
Above cyclic water tank 8, arrange electronic scales 5, water tank 3 of weighing placed by electronic scales 5, and water tank 3 side of weighing is cyclic water tank entrance 18; Commutator 2 is arranged on above weigh water tank 3 and cyclic water tank entrance 18, and rising pipe 17 is arranged on above commutator 2, and this rising pipe 17 side is with optoelectronic switch 1; Be provided with water delivering orifice bottom commutator 2, by the conversion of commutator 2 position, the water that rising pipe 17 is flowed out its only flow into cyclic water tank entrance 18 or only inflow to weigh water tank 3.
Weighing, water tank 3 side is provided with the discharge pipe line be communicated with cyclic water tank 8, and this discharge pipe line arranges water tank drain valve 4 of weighing.Described cyclic water tank 8 is as water source, and internal capacity is greater than 10 times of water tank 3 internal capacity of weighing.
Above-mentioned optoelectronic switch 1, water tank drain valve 4 of weighing, electronic scales 5, pump intake valve 7, cyclic water tank water intaking valve 9, variable frequency pump 10, pump discharge valve 11. flowmeter inlet valve 13, frequency meter 14, flowmeter 15 and variable valve 16 are field apparatus, these field apparatuss are connected with programmable logic controller (PLC) 21 respectively by circuit, and programmable logic controller (PLC) 21 is undertaken by Industrial Ethernet 20 and human-computer interaction interface 19 alternately.
As shown in Figure 2, described human-computer interaction interface 19 adopts two-shipper to configure, after a deadlock, another still can operate, the stability of raising system, it is responsible for the instruction receiving user's input and user's transmission, utilize modbus/TCP communication protocol, carry out alternately through Industrial Ethernet 20 and programmable logic controller (PLC) 21, all logics are in programmable logic controller (PLC) 21, it receives the signal of field apparatus, and controls field apparatus, all kinds of for present equipment state transfer is shown to human-computer interaction interface 19.Described programmable logic controller (PLC) 21 by digital quantity card control field apparatus, i.e. the switch of valve, the start and stop of pump, the position conversion of commutator 2; By the frequency of analog output card control variable frequency pump 10 and the aperture of variable valve 16; What flowmeter returned is pulse value, is gathered by frequency meter 14, and records accumulated pulse number and be scaled integrated flow, and by timer interrupt mode, the umber of pulse in record 1s, is scaled instantaneous delivery.
Embodiment 2
Adopt the method for the autostable discharge of the autostable water flow device described in embodiment 1, it comprises the steps:
A () ON cycle tank intake valve of water 9, makes liquid level in cyclic water tank 8 be 80% ~ 90% of its full liquid level; Open pump intake valve 7, variable frequency pump 10, pump discharge valve 11, the liquid level of buffer tank 12 is adjusted, ensure that in buffer tank 12, liquid level is 80% ~ 90% of its full liquid level; Turn-on flow rate meter inlet valve 13, variable valve 16, commutator changes 2 and is transformed into cyclic water tank entrance 18 place, realizes water and circulates in cyclic water tank loop;
B (), using flowmeter 15 flow as real-time traffic, changes the frequency of variable frequency pump 10 by pid algorithm, adjusted to by flow in 90% ~ 110% scope of setting flow fast; Flow is adjusted to after in 90% ~ 110% scope, enabling the PID module of variable valve 16, by adjusting its aperture, regulating flow; In the acting in conjunction of variable frequency pump 10 with variable valve 16, realize the stable regulation of flow;
(c) flow adjust to setting flow 98% ~ 102% scope in after, electronic scales 5 is removed the peel, frequency meter 14 resets, commutator 2 is carried out commutating to water tank 3 position of weighing, optoelectronic switch 1 can be triggered during commutation, when programmable logic controller (PLC) 20 receives the first time pulse signal of optoelectronic switch 1, the simultaneously umber of pulse that sends of frequency meter 14 recording flowmeter 15;
D (), after arrival rated weight weighed by electronic scales 5, commutator 2 gains cyclic water tank entrance 18 place, now optoelectronic switch 1 produces second time pulse signal, and frequency meter 14 stops counting;
Accumulated pulse number in (e) reading frequency meter 14 and time, read the value of weighing of electronic scales; Unlatching is weighed water tank drain valve 4, closes after draining;
(f) repeat step (b) to step (e) complete same calibrating point 3 times calibrating after, calculate one calibrating point average discharge.
G () repeats step (b) to step (f), until the calibrating point of all inputs has all been examined and determine, and off-test.
The present invention is directed to the deficiency of existing method for stabilizing voltage, the basis of frequency conversion voltage stabilizing method is designed the part of a set of automatic flow regulator as flow standard device, two PID ring that closes is utilized to control, fast, stable regulating water flow, the program all adopts automatic control, realizes the robotization of verification process.Adopt variable frequency pump, use pid algorithm in the incipient stage, adjust flux reaches 90% ~ 110% of setting value fast, realizes the quick adjustment of flow.Adopt the electric controlled regulating valve with feedback, time in 90% ~ 110% scope that flow arrives setting value, coordinate variable frequency pump to carry out fine setting flow, realize the stable regulation of flow.Adopt cyclic water tank as water source, internal capacity is greater than 10 times of water tank internal capacity of weighing, and in verification process, 1/10 of water source page change its liquid level not super, can be pump intake and provide metastable pressure head.Adopt buffer tank voltage stabilizing, one is collect in buffer tank by residual gas in pipeline, and two is effects that the pulsating flow produced variable frequency pump plays buffering.
Claims (9)
1. the device of an autostable discharge, it is characterized in that: this device comprises cyclic water tank (8), cyclic water tank (8) side connects cyclic water tank water intaking valve (9) by pipeline, and opposite side connects variable frequency pump (10) by pipeline; Variable frequency pump (10) connects buffer tank (12) by pipeline, buffer tank (12) is by pipeline connection traffic meter (15), and flowmeter (15) connects the rising pipe (17) being arranged on commutator (2) top by pipeline; Flowmeter (15) arranges frequency meter (14);
Arrange electronic scales (5) in cyclic water tank (8) top, the upper placement of electronic scales (5) is weighed water tank (3), and water tank of weighing (3) side is cyclic water tank entrance (18); Commutator (2) is arranged on water tank of weighing (3) and cyclic water tank entrance (18) top, rising pipe (17) is arranged on commutator (2) top, and this rising pipe (17) side is with optoelectronic switch (1); Commutator (2) bottom is provided with water delivering orifice, by the conversion of commutator (2) position, the water that rising pipe (17) is flowed out its only flow into cyclic water tank entrance (18) or only flow into and to weigh water tank (3).
2. the device of a kind of autostable discharge according to claim 1, it is characterized in that: be provided with the discharge pipe line be communicated with cyclic water tank (8) in water tank of weighing (3) side, this discharge pipe line arranges water tank drain valve (4) of weighing; Cyclic water tank (8) is provided with cyclic water tank liquid level gauge (6); The pipeline that cyclic water tank (8) is connected with variable frequency pump (10) is provided with pump intake valve (7); The pipeline that variable frequency pump (10) is connected with buffer tank (12) is provided with pump discharge valve (11); The pipeline that buffer tank (12) is connected with flowmeter (15) is provided with flowmeter inlet valve (13); The pipeline that flowmeter (15) is connected with rising pipe (17) is provided with variable valve (16).
3. the device of a kind of autostable discharge according to claim 2, it is characterized in that: described optoelectronic switch (1), to weigh water tank drain valve (4), electronic scales (5), pump intake valve (7), cyclic water tank water intaking valve (9), variable frequency pump (10), pump discharge valve (11), . flowmeter inlet valve (13), frequency meter (14), flowmeter (15) and variable valve (16) are field apparatus, these field apparatuss are connected with programmable logic controller (PLC) (21) respectively by circuit, programmable logic controller (PLC) (21) is undertaken by Industrial Ethernet (20) and human-computer interaction interface (19) alternately.
4. the device of a kind of autostable discharge according to claim 3, it is characterized in that: described human-computer interaction interface (19) adopts two-shipper configuration, after a deadlock, another still can operate, it is responsible for the instruction receiving user's input and user's transmission, utilize modbus/TCP communication protocol, carry out alternately through Industrial Ethernet (20) and programmable logic controller (PLC) (21), all logics are in programmable logic controller (PLC) (21), it receives the signal of field apparatus, and control field apparatus, all kinds of for present equipment state transfer is shown to human-computer interaction interface (19).
5. the device of a kind of autostable discharge according to claim 4, it is characterized in that: described programmable logic controller (PLC) (21) by digital quantity card control field apparatus, i.e. the start and stop of the switch of valve, pump, the position conversion of commutator (2); By the frequency of analog output card control variable frequency pump (10) and the aperture of variable valve (16); What flowmeter returned is pulse value, is gathered by frequency meter (14), and records accumulated pulse number and be scaled integrated flow, and by timer interrupt mode, the umber of pulse in record 1s, is scaled instantaneous delivery.
6. adopt a method for the autostable discharge of autostable water flow device according to claim 1, it is characterized in that, the method comprises the steps:
A () ON cycle tank intake valve of water (9), makes cyclic water tank (8) interior liquid level be 80% ~ 90% of its full liquid level; Open pump intake valve (7), variable frequency pump (10), pump discharge valve (11), the liquid level of buffer tank (12) is adjusted, ensure that buffer tank (12) interior liquid level is 80% ~ 90% of its full liquid level; Turn-on flow rate meter inlet valve (13), variable valve (16), commutator changes (2) is transformed into cyclic water tank entrance (18) place, realizes water and circulates in cyclic water tank loop;
B (), using flowmeter (15) flow as real-time traffic, changes the frequency of variable frequency pump (10) by pid algorithm, adjusted to by flow in 90% ~ 110% scope of setting flow fast; Flow is adjusted to after in 90% ~ 110% scope, enabling the PID module of variable valve (16), by adjusting its aperture, regulating flow; In the acting in conjunction of variable frequency pump (10) with variable valve (16), realize the stable regulation of flow;
(c) flow adjust to setting flow 98% ~ 102% scope in after, electronic scales (5) is removed the peel, frequency meter (14) resets, commutator (2) is carried out commutating to water tank of weighing (3) position, optoelectronic switch (1) can be triggered during commutation, when programmable logic controller (PLC) (20) receives the first time pulse signal of optoelectronic switch (1), the simultaneously umber of pulse that sends of frequency meter (14) recording flowmeter (15);
D () is after arrival rated weight weighed by electronic scales (5), commutator (2) gains cyclic water tank entrance (18) place, now optoelectronic switch (1) produces second time pulse signal, and frequency meter (14) stops counting;
Accumulated pulse number in (e) reading frequency meter (14) and time, read the value of weighing of electronic scales; Unlatching is weighed water tank drain valve (4), closes after draining.
7. the method for a kind of autostable discharge according to claim 6, it is characterized in that, the method comprises the steps (f), namely
(f) repeat step (b) to step (e) complete same calibrating point 3 times calibrating after, calculate one calibrating point average discharge.
8. the method for a kind of autostable discharge according to claim 7, it is characterized in that, the method comprises the steps (g), namely
G () repeats step (b) to step (f), until the calibrating point of all inputs has all been examined and determine, and off-test.
9. the method for a kind of autostable discharge according to claim 6, is characterized in that, described cyclic water tank (8) is as water source, and internal capacity is greater than 10 times of water tank of weighing (3) internal capacity.
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| CN201410638120.4A CN104375520B (en) | 2014-11-05 | 2014-11-05 | A kind of device and method of automatic stabilisation water-carrying capacity |
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| CN201410638120.4A CN104375520B (en) | 2014-11-05 | 2014-11-05 | A kind of device and method of automatic stabilisation water-carrying capacity |
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| CN107861380A (en) * | 2017-11-07 | 2018-03-30 | 北京金控数据技术股份有限公司 | Flow control methods, device, equipment and storage medium in desalting process |
| CN108918384A (en) * | 2018-07-18 | 2018-11-30 | 重庆大学 | Earth pillar seepage inflow erosion experimental provision and soil-water separate experimental method under a kind of rain infiltration |
| CN111307253A (en) * | 2019-10-14 | 2020-06-19 | 北京远东仪表有限公司 | Intelligent detection and control system and method for flow device commutator |
| CN116104751A (en) * | 2023-01-13 | 2023-05-12 | 绍兴淼汇能源科技有限公司 | High-precision testing device and testing method for flow rate of volumetric pump outlet |
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| CN104375520B (en) | 2017-10-27 |
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