CN105067155A - Flow test device pressure and flow velocity double closed loop control system - Google Patents
Flow test device pressure and flow velocity double closed loop control system Download PDFInfo
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- CN105067155A CN105067155A CN201510498224.4A CN201510498224A CN105067155A CN 105067155 A CN105067155 A CN 105067155A CN 201510498224 A CN201510498224 A CN 201510498224A CN 105067155 A CN105067155 A CN 105067155A
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Abstract
The invention discloses a flow test device pressure and flow velocity double closed loop control system. A pressure control closed-loop system is formed by a constant temperature water tank, a water supply unit, a constant pressure control acquisition sensor, a pressure automatic control regulator and an upper computer. When work voltage of the pressure control closed-loop system deviates from the set pressure, the constant pressure control acquisition sensor transmits a pressure signal to the pressure automatic control regulator and the upper computer respectively. A flow control closed-loop system is formed by a gauge inspection device, a flow velocity state acquisition sensor, a straight stroke flow regulating valve, a flow velocity control performer and an upper computer. When work flow velocity of the flow control closed-loop system deviates from the set flow velocity, the flow velocity state acquisition sensor transmits a flow velocity signal to the flow velocity control performer and the upper computer. Water supply pressure and work flow velocity are ensured to be simultaneously constant or mutually supplementary so that control of reduced device size and accurate energy saving can be realized, and degree of stability of flow velocity of work medium water of the device is lower than 0.5%.
Description
Technical field
The present invention relates to device for testing flow technical field, particularly relate to a kind of pressure and flow velocity double closed-loop control system of device for testing flow.
Background technology
At present, heat metering reform is generally implemented in the northern area of China, the manufacturing enterprise of calorimeter and the metrological service that calorimeter implements compulsory verification is first got more and more, also increasing to the demand of heat meter calibrating apparatus, because calorimeter device to apply the history of only more than ten years in China, so most device adopts the change of buffer tank voltage stabilizing controlled pressure, the majority adopting variable frequency control is opened loop control, control by setting a fixing frequency, all there is certain problem technically in these, cause flow control unstable, have impact on accuracy of measurement, thus be difficult to ensure product quality.
Separately, according to EN1434-2015 (European calorimeter standard) and new national standard, implementing endurancing to calorimeter, equally also there is above-mentioned defect in its device; Also Similar Problems is there is in water meter industry.The present invention proposes a kind of pressure and flow velocity double closed-loop control system of device for testing flow, flow rate control accuracy is increased substantially, also improves the accuracy of measurement of test unit simultaneously.
Summary of the invention
Based on the technical matters that background technology exists, the present invention proposes a kind of pressure and flow velocity double closed-loop control system of device for testing flow.
The pressure of a kind of device for testing flow that the present invention proposes and flow velocity double closed-loop control system, comprise constant temperature water tank, water supplying unit, Isobarically Control pick-up transducers, pressure automatic control regulator, inspection meter apparatus, flow rate regime pick-up transducers, Direct Travel flow control valve, flow control actuator and host computer;
Constant temperature water tank, water supplying unit, Isobarically Control pick-up transducers, pressure automatic control regulator and host computer decomposition pressure Control loop system; When Stress control closed-loop system working pressure departs from set pressure, pressure signal is delivered to pressure automatic control regulator and host computer by Isobarically Control pick-up transducers respectively, host computer changes the frequency driving water pump in water supplying unit by pressure automatic control regulator, by changing pump rotary speed, reaching change water thrust of pump and making Stress control closed-loop system pressure stability in the deviation range that set pressure allows;
Inspection meter apparatus, flow rate regime pick-up transducers, Direct Travel flow control valve, flow control actuator and host computer composition flow control closed-loop system; When flow control closed-loop system working flow rate departs from setting flow velocity, flow velocity signal is delivered to flow control actuator and host computer by flow rate regime pick-up transducers, host computer controls Direct Travel flow control valve by flow control actuator, makes flow control closed-loop system flow speed stability in the deviation range that setting flow velocity allows.
Preferably, Isobarically Control pick-up transducers adopts pressure unit.
Preferably, flow rate regime pick-up transducers adopts electromagnetic flowmeter.
Preferably, flow control actuator adopts flow regulator.
The pressure of a kind of device for testing flow that the present invention proposes and flow velocity double closed-loop control system, Stress control closed-loop system uses closed loop constant pressure frequency conversion control technology, make pressure of supply water more stable, ensure pipeline for water loops water pressure smoothness in the scope preset, thus ensure that the constant of verification and experiment device flow velocity.Flow control closed-loop system uses automatic flow velocity closed-loop control, in verification and experiment process, only need set calibrating required flow rate numerical value, automatic control mathematical model coutroi velocity value and setting value is used to keep being close to consistent minimum difference by host computer, form the control to flow velocity thus, coordinate flow control P, the I of high precision design, the flow regulator of D-algorithm, realize the Automatic Control of instantaneous delivery.Stress control closed-loop system coordinates with flow control closed-loop system and makes the present invention be much higher than conventional equipment more than 50% in flow control quality, improves the accuracy of measurement of test unit.
The present invention be used for " heat energy " count (surveys) amount calorimeter implement inspection (determining) time calibrating installation used adopt a kind of to flow velocity enforcement double-closed-loop control system, also be applicable to the flux experiment such as calorimeter endurance test apparatus, apparatus for calibrating water meter device simultaneously, when working for guaranteed flow experimental provision (as heat meter calibrating apparatus), the flow velocity of fluid media (medium) water is in stable standard state, with the accuracy of warranty test and verification result.The present invention is by the double-closed-loop control to pressure of supply water and working flow rate, constant or complement one another while ensure that pressure of supply water and working flow rate, achieve that device volume reduces, economize energy controls accurately, the flow speed stability degree achieving device working medium water reaches < 0.5%.
Accompanying drawing explanation
Fig. 1 is the pressure of a kind of device for testing flow that the present invention proposes and the structured flowchart of flow velocity double closed-loop control system.
Fig. 2 is the pressure of a kind of device for testing flow that the present invention proposes and the structural representation of flow velocity double closed-loop control system application of heat table calibrating installation.
In figure: 1, refrigeration unit, 2, well heater, 3, cryogenic media/high-temperature medium case, 4, manual ball valve, 5, variable frequency pump, 6, frequency converter, 7, pressure unit, 8, electronic gas control water intaking valve, 9, heat meter calibration testing table, 10, electromagnetic flowmeter, 11, electropneumatic ball valve, 12, automatically controlled fast positioning and adjustment valve, 13, visor, 14, electropneumatic valve, 15, temperature sensor.
Embodiment
As shown in Figure 1-2, Fig. 1 is the pressure of a kind of device for testing flow that the present invention proposes and the structured flowchart of flow velocity double closed-loop control system; Fig. 2 is the pressure of a kind of device for testing flow that the present invention proposes and the structural representation of flow velocity double closed-loop control system application of heat table calibrating installation.
With reference to Fig. 1, the pressure of a kind of device for testing flow that the present invention proposes and flow velocity double closed-loop control system, comprise constant temperature water tank, drive water pump, pressure unit, pressure automatic control regulator, examine meter apparatus, electromagnetic flowmeter, Direct Travel flow control valve, flow regulator and host computer;
Constant temperature water tank, driving water pump, pressure unit, pressure automatic control regulator and host computer decomposition pressure Control loop system; When Stress control closed-loop system working pressure departs from set pressure, pressure signal is delivered to pressure automatic control regulator and host computer by pressure unit respectively, host computer changes the frequency driving water pump by pressure automatic control regulator, by changing pump rotary speed, reaching change and driving water thrust of pump to make Stress control closed-loop system pressure stability in the deviation range that set pressure allows;
Inspection meter apparatus, electromagnetic flowmeter, Direct Travel flow control valve, flow regulator and host computer composition flow control closed-loop system; When flow control closed-loop system working flow rate departs from setting flow velocity, flow velocity signal is delivered to flow regulator and host computer by electromagnetic flowmeter, host computer controls Direct Travel flow control valve by flow regulator, makes flow control closed-loop system flow speed stability in the deviation range that setting flow velocity allows.
With reference to Fig. 2, the pressure of a kind of device for testing flow that the present invention proposes and flow velocity double closed-loop control system are applied to heat meter calibrating apparatus, comprise cryogenic media/high-temperature medium case 3, cryogenic media/high-temperature medium case 3 is provided with refrigeration unit 1, well heater 2 and temperature sensor 15, cryogenic media/high-temperature medium case 3 water side manually ball valve 4, variable frequency pump 5, pressure unit 7, the entrance point of electronic gas control water intaking valve 8 and heat meter calibration testing table 9, the electromagnetic flowmeter 10 of heat meter calibration testing table 9 endpiece by connecting successively, electropneumatic ball valve 11, automatically controlled fast positioning and adjustment valve 12, visor 13, electropneumatic valve 14 is connected with cryogenic media/high-temperature medium case 3 water inlet end.Variable frequency pump 5 is connected with frequency converter 6, frequency converter 6 and pressure unit 7 are connected in parallel and are connected with electromagnetic flowmeter 10, automatically controlled fast positioning and adjustment valve 12 respectively afterwards.
With reference to Fig. 2, cryogenic media/high-temperature medium case 3, variable frequency pump 5, pressure unit 7, heat meter calibration testing table 9 and automatically controlled fast positioning and adjustment valve 12 decomposition pressure Control loop system, use constant pressure frequency conversion control technology, make pressure of supply water more stable, ensure that pipeline supplies water this loop discharge smoothness in the scope required, thus ensure that the constant of heat meter calibrating apparatus flow velocity.Heat meter calibration testing table 9, electromagnetic flowmeter 10, electropneumatic ball valve 11 and electropneumatic valve 14 form flow control closed-loop system, realize the Automatic Control of instantaneous delivery, in verification process, only need set calibrating required flow rate numerical value, use automatic control mathematical model coutroi velocity value and setting value to keep being close to consistent minimum difference by heat meter calibrating apparatus, formed thus flow Control loop Systematical control.
Due to flow regulation have influence on pressure change time, Stress control closed-loop system meeting follow-up in time coordinates with flow control closed-loop system carries out system pressure adjustment, both effect distribution are determined by control algolithm by the change numerical value of host computer by two parameter, the final flow speed stability < 0.5% ensureing the working medium water of calibrating installation.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (4)
1. the pressure of a device for testing flow and flow velocity double closed-loop control system, it is characterized in that, comprise constant temperature water tank, water supplying unit, Isobarically Control pick-up transducers, pressure automatic control regulator, inspection meter apparatus, flow rate regime pick-up transducers, Direct Travel flow control valve, flow control actuator and host computer;
Constant temperature water tank, water supplying unit, Isobarically Control pick-up transducers, pressure automatic control regulator and host computer decomposition pressure Control loop system; When Stress control closed-loop system working pressure departs from set pressure, pressure signal is delivered to pressure automatic control regulator and host computer by Isobarically Control pick-up transducers respectively, host computer changes the frequency driving water pump in water supplying unit by pressure automatic control regulator, by changing pump rotary speed, reaching change water thrust of pump and making Stress control closed-loop system pressure stability in the deviation range that set pressure allows;
Inspection meter apparatus, flow rate regime pick-up transducers, Direct Travel flow control valve, flow control actuator and host computer composition flow control closed-loop system; When flow control closed-loop system working flow rate departs from setting flow velocity, flow velocity signal is delivered to flow control actuator and host computer by flow rate regime pick-up transducers, host computer controls Direct Travel flow control valve by flow control actuator, makes flow control closed-loop system flow speed stability in the deviation range that setting flow velocity allows.
2. the pressure of device for testing flow according to claim 1 and flow velocity double closed-loop control system, is characterized in that, Isobarically Control pick-up transducers adopts pressure unit.
3. the pressure of device for testing flow according to claim 1 and flow velocity double closed-loop control system, is characterized in that, flow rate regime pick-up transducers adopts electromagnetic flowmeter.
4. the pressure of device for testing flow according to claim 1 and flow velocity double closed-loop control system, is characterized in that, flow control actuator adopts flow regulator.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107015577A (en) * | 2017-03-22 | 2017-08-04 | 辽宁瑞丰专用车制造有限公司 | A kind of fracturing blender truck constant-current voltage-stabilizing formula method for automatic controlling liquid level |
| CN112695842A (en) * | 2021-01-11 | 2021-04-23 | 锦霸科技股份有限公司 | Constant-pressure water supply control method without pressure tank |
| CN113920828A (en) * | 2021-10-15 | 2022-01-11 | 宁波大学 | Controllable variable-pressure unsteady flow water supply experimental device |
| CN114415746A (en) * | 2021-11-29 | 2022-04-29 | 中国船舶工业集团公司第七0八研究所 | Novel cascade microfluid intelligence control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114415746A (en) * | 2021-11-29 | 2022-04-29 | 中国船舶工业集团公司第七0八研究所 | Novel cascade microfluid intelligence control system |
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Application publication date: 20151118 |