CN102680059A - Method for reducing small-flow calibration error of test bed flow meter of hydraulic machine model - Google Patents
Method for reducing small-flow calibration error of test bed flow meter of hydraulic machine model Download PDFInfo
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Abstract
The invention relates to a method for reducing a small-flow calibration error of a test bed flow meter of a hydraulic machine model. A damping adjusting device is additionally arranged in a calibration pipeline system of the test bed flow meter of the hydraulic machine model; the damping of the pipeline system is increased through adjustment by the damping adjusting device and a rotating speed of a water supply pump is correspondingly improved, so that the water supply pump can still work in a stable region when the water supply pump is at a small flow; and a phenomenon that a water flow entering the calibration pipeline system is waved under the small flow, which is caused by that the water supply pump works at an unstable region, is avoided, so that the small-flow calibration error of the test bed flow meter of the hydraulic machine model is reduced.
Description
Technical field: the present invention relates to a kind of method that reduces hydraulic rig for model test flowmeter low discharge calibration error.
Background technology: hydraulic rig for model test s main working parameters has head (lift), flow, torque and rotating speed etc.; Wherein flow is the most important test parameters of hydraulic rig for model test, must be regularly---flowmeter---carries out the original position calibration to flow measurement.Hydraulic rig for model test calibration system is as shown in Figure 1; The calibration process of hydraulic rig for model test flowmeter (4) is: buncher (2) is stabilized in a certain rotating speed; When just the water yield that pumps of make-up pump 1 is stablized; Buncher (2) drags make-up pump 1 with in the water suction pipe system in the tank (3), and the current flowmeter (4) of flowing through flows back to tank (3) after through normal flow detection system 6 again.Be utilized in the normal flow of different flow down-off meter (4) output electric signal and 6 corresponding demonstrations of normal flow detection system; Can accomplish the work of setting up flowmeter (4) output electric signal and flow corresponding relation; Just set up flowmeter (4) the output electric signal correspondence corresponding relation between the discharge of flowmeter (4) of flowing through, the purpose of hydraulic rig for model test flowmeter (4) calibration that Here it is.
Usually adopt the method for the traffic alignment error of analyzing flowmeter (4) to estimate for the calibration result of hydraulic rig for model test flowmeter (4).Promptly; The flow value that flows through flowmeter (4) that the output electric signal of the flowmeter under each flow (4) and corresponding normal flow detection system (6) are measured; Be the calibration result of flowmeter, simulate the relation curve of the flow value that flows through flowmeter (4) that the corresponding normal flow detection system of output electric signal (6) of flowmeter (4) measures.Can be calculated as follows out the traffic alignment error of waterpower mechanical model testing table flowmeter (4) by this relation curve:
In the formula:
e
r: the traffic alignment error of flowmeter (4);
Q
m: the flow value that normal flow detection system (6) is measured;
Q
c: the flow value of the flowmeter that the relation curve of the flow value of measuring according to the corresponding normal flow detection system of the output electric signal of the flowmeter that goes out by least square fitting (4) (6) that flows through flowmeter (4) calculates.
The flow value Q that measures with normal flow detection system (6)
mTraffic alignment error e for horizontal ordinate, flowmeter (4)
rFor ordinate is plotted on Fig. 2.To being plotted in the traffic alignment error e of the flowmeter (4) on Fig. 2
rEstimate: the traffic alignment error e of flowmeter (4)
rMore approaching zero, show that then its calibration accuracy is high more; The traffic alignment error e
rNumerical value is big more, representes that then its calibration accuracy is poor more.In case traffic alignment error e
rExceed in the scope that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) surrounded, judge that then this calibration result is invalid, flowmeter (4) does not allow under this flow, to use.
The calibration procedure of the flowmeter (4) in the hydraulic rig for model test shown in Figure 1 is:
1. start normal flow detection system (6) and buncher (2);
2. buncher (2) is stabilized in the interior a certain rotating speed operation down of range of operation of 300 ~ 1000 rev/mins make-up pump 1;
3. buncher (2) drives make-up pump 1 stable operation;
4. make-up pump 1 is in the water suction pipe system in the tank (3), and the current flowmeter (4) of flowing through flows back to tank (3) after through normal flow detection system (6) again.So move in circles;
5. system stable operation is 10 minutes;
6. utilize normal flow detection system (6) to measure the flow value that flows through flowmeter (4) this moment, gather the output electric signal of flowmeter (4) simultaneously;
7. whether the calibration of judging flow is counted meets the demands; If, then change step 9 over to, otherwise; Flow according to the need calibration is different; The rotating speed of adjustment buncher (2) changes the pump water yield of make-up pump 1 in pipe system, promptly changes the discharge that flows through flowmeter (4), the operation of repeating step 3 to step 6;
8. with the traffic alignment error e of flowmeter (4)
rCompare with the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7): if calibration error e
rBe positioned at the scope that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) are surrounded, then flowmeter (4) calibration is qualified, can use; In case calibration error e
rBe positioned at outside the scope that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) surrounded, judge that then this calibration result is invalid, flowmeter (4) does not allow under this flow, to use;
9. close normal flow detection system (6) and buncher (2).
The calibration result of the hydraulic rig for model test flowmeter (4) of existing routine is all as shown in Figure 2, that is, and and most flow down-off calibration error e
rAll be positioned at the scope that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) are surrounded, have only the traffic alignment error e of leftmost side lower-capacity point
rExceeded the theoretical calibration curve upper limit (8), therefore, conventional hydraulic rig for model test flowmeter (4) often can not use under this low discharge.This has just greatly limited the working range of hydraulic rig for model test, therefore, necessary flowmeter in the hydraulic rig for model test (4) is analyzed and is taken measures in the calibration error problem of transfiniting of lower-capacity point improve.
The calibration procedure of the flowmeter in the hydraulic rig for model test (4) can be known; In the calibration process of the flowmeter (4) in the whole hydraulic rig for model test; The duty of other equipment all is identical; It is adjustable that the rotating speed of forming the pump group by buncher (2) and make-up pump 1 is only arranged, and the rotating speed of the pump group of being made up of buncher (2) and make-up pump 1 has directly determined through hydraulic rig for model test pipe system, i.e. flowmeter (4); Flow size and fluctuation situation, the running status of the pump group of just being made up of buncher (2) and make-up pump 1 has just directly determined the size of the calibration error of the flowmeter (4) in the hydraulic rig for model test.All be in steady state (SS) as long as can guarantee to form the buncher (2) and the make-up pump 1 of pump group, just should realize calibration error e
rBe positioned at the purpose of the scope that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) surrounded.Because the rotating speed of buncher (2) can be controlled very accurately; And make-up pump 1 exists a unsettled zone in the low discharge scope; Therefore, as long as improved the purpose that the stability of make-up pump 1 in the low discharge zone also just can realize reducing the calibration error of hydraulic rig for model test flowmeter (4).
Summary of the invention: the present invention seeks to disclose a kind of water pump and get into the current of calibrating in the pipe system still can be operated in the reduction hydraulic rig for model test flowmeter low discharge calibration error of stabilized zone when low discharge method.Technical scheme of the present invention is: a kind of method that reduces hydraulic rig for model test flowmeter low discharge calibration error increases damper regulator (5), and operates by following program in hydraulic rig for model test flowmeter calibration pipe system:
1, starts normal flow detection system (6) and buncher (2);
2, buncher (2) is stabilized in the interior operation of range of operation of 300 ~ 1000 rev/mins make-up pump (1);
3, buncher (2) drives make-up pump (1) stable operation;
4, make-up pump (1) is in the water suction pipe system in the tank (3), and the current flowmeter (4) of flowing through flows back to tank (3) after through normal flow detection system (6) again, so moves in circles;
5, system stable operation is 10 minutes;
6, utilize normal flow detection system (6) to measure and flow through the flow value of gathering flowmeter (4) this moment, gather the output electric signal of flowmeter (4) simultaneously;
Whether the calibration of 7, judging flow is counted meets the demands, if, then change step (9) over to, otherwise, with the traffic alignment error e of flowmeter (4)
rCompare with the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7): if calibration error e
rBe positioned at the scope that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) are surrounded; Then different according to the flow of need calibration; The rotating speed of adjustment buncher (2) changes the pump water yield of make-up pump (1) in pipe system; Promptly change the discharge that flows through flowmeter (4), in case the operation of repeating step 3 to step 6 is certain low discharge Q
iCalibration error e
rBe positioned at outside the scope that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) surrounded, then execution in step 8;
8, damper regulator (5) action increases the damping of pipe system, improves the rotating speed of buncher (2) simultaneously, makes the flow that flows through flowmeter (4) reach Q
i, meanwhile, incite somebody to action the traffic alignment error e of flowmeter this moment (4) once more
rCompare with the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7), if the traffic alignment error e
rBe positioned at the zone that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) are surrounded, then return step 7, if the traffic alignment error e
rStill do not drop in the zone that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) surrounded; Then continue to reconcile damper regulator (5) to increase the damping of pipe system; And continue to improve the rotating speed of buncher (2) simultaneously, make the flow that flows through flowmeter (4) reach Q
i, until making the traffic alignment error e
rTill dropping in the zone that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) surrounded, return step 7;
9, close normal flow detection system (6) and buncher (2).
The steady operation zone of make-up pump of the present invention (1) is to represent through the serviceability curve of make-up pump as shown in Figure 3 (1).The serviceability curve of make-up pump (1) is through in that to decide the steady operation zone that relation between rotating speed down-off Q and lift H distinguishes make-up pump (1) regional with unstable operation.The steady operation zone of make-up pump (1) is: the tangent slope at the corresponding lift H of the serviceability curve of make-up pump (1), flow Q place is a negative value; The serviceability curve that is make-up pump (1) is at point (Q; During the derivative of H) locating
; Reducing just along with flow Q; Lift H is dull ascendant trend, and lift H and flow Q are one-to-one relationship.At this moment, as shown in Figure 4, from the serviceability curve of make-up pump (1), for some specific lift H1, only there is a flow Q1 corresponding with it.The steady operation zone of above-mentioned make-up pump 1 covers all big flow region, minimum flow region and most low discharge zone.But in certain section low discharge zone; Characteristic as make-up pump itself; The tangent slope that the corresponding lift H of serviceability curve, the flow Q place of a kind of make-up pump (1) can occur be on the occasion of; The serviceability curve that is make-up pump (1) is at point (Q; The wild effect of the derivative of H) locating
, promptly along with the reducing of flow, lift reduces on the contrary.In this unstable region; Lift H and flow Q no longer demonstrate one-to-one relationship, just from the serviceability curve of make-up pump (1), for some specific lift H2; In a less relatively fluctuations in discharge scope, it is corresponding with it to have a plurality of flow Q2, Q3 and Q4.This characteristic has determined make-up pump (1) in this zone, unsettled duty can occur.
Can know from the operating characteristic of make-up pump (1); Non-steady state does not appear in the low discharge zone if can guarantee make-up pump (1); The phenomenon that
just do not occur; Just can guarantee to be in steady state (SS) all the time, thereby realization reduces the purpose of the calibration error of hydraulic rig for model test flowmeter (4) low discharge by the pump group that buncher (2) and make-up pump (1) are formed.
The serviceability curve of make-up pump (1) was seen Fig. 5 when conventional hydraulic rig for model test flowmeter (4) was calibrated.The characteristic working curve of curve (1), curve (2) and curve (3) make-up pump (1) when representing different rotating speeds respectively.The lift H of the characteristic working curve of the make-up pump under the different rotating speeds (1) and the variation tendency of flow Q are identical; Only along with the increase of rotating speed; The characteristic working curve of make-up pump (1) is more and more to the translation of the upper right corner of Fig. 5; The rotating speed that is make-up pump (1) is high more, and pairing lift H is just high more under the certain flow Q.The flow that make-up pump (1) can provide is not only relevant with rotating speed, also with this flow under the damping curve of hydraulic rig for model test calibration system have closely and get in touch.Curve among Fig. 5 (4); Damping curve under the hydraulic rig for model test calibration system different flow; Characteristic working curve with make-up pump 1: the pairing flow of intersection point (Qa, Qb and Qc) of curve (1), curve (2) and curve (3) is under this rotating speed and pumps into the hydraulic rig for model test calibration system pipeline from make-up pump (1); Just flow through flowmeter (4), flow.From Fig. 5, can find; When flow is big; Be Qb and Qc point place, the characteristic working curve of corresponding make-up pump (1), promptly the slope of curve (12) and curve (13) is for negative; Promptly be in the zone of
, just be in the steady operation zone of make-up pump (1).And at the less Qa point place of flow, the characteristic working curve of corresponding make-up pump (1), promptly the slope of curve (11) promptly is in for just just
The zone, just be in the unstable operation zone of make-up pump (1), calibration error e during low discharge shown in Fig. 2
rThe reason that has exceeded the theoretical calibration curve upper limit (8) is exactly because due to make-up pump (1) is in the unstable operation zone of characteristic working curve positive slope region.
The present invention is in order to reduce the calibration error of hydraulic rig for model test flowmeter (4), and just something must be done to makes the lower-capacity point corresponding to the characteristic working curve positive slope region unstable region of make-up pump (1) such as Qa point shown in Figure 5 be positioned at the stabilized zone of the negative slope region of characteristic working curve.Owing to get into hydraulic rig for model test calibration system pipe system, flowmeter (4) just, flow depend on the resistance of pipe system, i.e. damping is with the matching relationship of make-up pump 1 running status.The damping of hydraulic rig for model test calibration system pipe system has determined the lift of make-up pump (1); The damping that is to say pipe system equates with the lift of make-up pump (1); It is the i.e. lift of the make-up pump (1) under the operating mode for this reason of lift of the pairing make-up pump of intersection point a, b and c (1) of characteristic working curve (11), curve (12) and curve (13) of damping curve (14) and the make-up pump (1) of pipe system as shown in Figure 5; And for the hydraulic rig for model test calibration system pipe system of routine; Because its damping curve (14) is uncontrollable; Rotation speed change for make-up pump (1); Just different operational characteristics curve (11), curve (12) and curve (13), flow can only be the damping curve (14) of pipe system with intersection point a, b and the c of characteristic working curve (11), curve (12) and the curve (13) of make-up pump (1) unique corresponding Qa, Qb and Qc value, other possibility can not appear.And when calibration such as the such low discharge of Qa; If can change the damping of hydraulic rig for model test calibration system pipe system, the damping of whole pipe system is increased, as shown in Figure 7; Just along with the increase of flow; The damping curve of pipe system (14) tilts the i.e. damping curve of the pipe system among Fig. 7 (15), and the rotating speed of corresponding raising make-up pump (1) to the upper left side of the characteristic working curve of make-up pump (1); Just make under expection low discharge Qa; The damping curve of pipe system (14) not only can be to intersect on curve (11) with the characteristic working curve of make-up pump (1), but also can be the d point that intersects on curve as shown in Figure 7 (13), at this moment; Because the intersection point d of the damping curve (15) of pipe system and the characteristic working curve (13) of make-up pump (1) is equally corresponding to low discharge Qa; And this moment is the residing positive slope unstable region of a point on the curve (11) because the d point on the curve (13) is positioned at the negative slope stabilized zone, has just guaranteed it is low discharge Qa equally theoretically, because make-up pump (1) can be operated in the negative slope stabilized zone of its characteristic working curve; Thereby make and get into hydraulic rig for model test calibration system pipe system this moment; Be flowmeter (4), flow stable, and then reach the purpose that reduces hydraulic rig for model test flowmeter (4) calibration error.
As shown in Figure 6, install damper regulator (5) additional in hydraulic rig for model test calibration pipe system.When make-up pump (1) when operating in the stabilized zone, damper regulator (5) is failure to actuate.The pipe system damping does not change.The calibration procedure of flowmeter (4) is identical with the calibration procedure of the conventional hydraulic rig for model test flowmeter (4) that does not install damper regulator (5) additional.When make-up pump (1) operates in the low discharge unstable region; As shown in Figure 7, regulate damper regulator (5), improve the damping of whole hydraulic rig for model test calibration pipe system and the rotating speed of corresponding raising make-up pump (1); Guaranteeing to get under the constant prerequisite of calibration pipeline flow system flow; Make make-up pump (1) be operated in its steady operation zone, thereby guarantee to get into the stable of calibration pipeline flow system flow, and then reduced the error of hydraulic rig for model test flowmeter low discharge calibration.
Description of drawings
Fig. 1 has conventional hydraulic rig for model test flowmeter calibration system now
The flowmeter calibration error of the existing conventional hydraulic rig for model test of Fig. 2
Fig. 3 make-up pump characteristic working curve
The lift of Fig. 4 make-up pump stabilized zone and unstable region and discharge relation
Make-up pump characteristic working curve under Fig. 5 different rotating speeds and calibration pipeline system damping curve
Fig. 6 adds the hydraulic rig for model test flowmeter calibration system of damper regulator
Calibration pipeline system damping curve before and after make-up pump characteristic working curve under Fig. 7 different rotating speeds and the damper regulator work
Fig. 8 adds the flowmeter calibration error of hydraulic rig for model test behind the damper regulator
Embodiment
A kind of method that reduces hydraulic rig for model test flowmeter low discharge calibration error as shown in Figure 1 increases damper regulator 5, and operates by following program in hydraulic rig for model test flowmeter calibration pipe system:
1, starts normal flow detection system 6 and buncher 2;
2, buncher 2 is stabilized in the interior operation of range of operation of 300 ~ 1000 rev/mins make-up pump 1;
3, buncher 2 drives make-up pump 1 stable operation;
4, make-up pump 1 is in the water suction pipe system in the tank 3, and the current flowmeter 4 of flowing through flows back to tank 3 after through normal flow detection system 6 again, so moves in circles;
5, system stable operation is 10 minutes;
6, utilize normal flow detection system 6 to measure and flow through the flow value of gathering flowmeter 4 this moment, gather the output electric signal of flowmeter 4 simultaneously;
Whether the calibration of 7, judging flow is counted meets the demands, if, then change step 9 over to, otherwise, with the traffic alignment error e of flowmeter 4
rCompare with theoretical calibration curve lower limit 7 with the theoretical calibration curve upper limit 8: if calibration error e
rBe positioned at the scope that the theoretical calibration curve upper limit 8 and theoretical calibration curve lower limit 7 are surrounded; Then different according to the flow of need calibration; The rotating speed of adjustment buncher 2 changes the pump water yield of make-up pump 1 in pipe system; Promptly change the discharge that flows through flowmeter 4, in case the operation of repeating step 3 to step 6 is certain low discharge Q
iCalibration error e
rBe positioned at outside the scope that the theoretical calibration curve upper limit 8 and theoretical calibration curve lower limit 7 surrounded, then execution in step 8;
8, damper regulator 5 actions increase the damping of pipe system, improve the rotating speed of buncher 2 simultaneously, make the flow that flows through flowmeter 4 reach Q
i, meanwhile, incite somebody to action the traffic alignment error e of flowmeter 4 this moment once more
rCompare with theoretical calibration curve lower limit 7 with the theoretical calibration curve upper limit 8, if the traffic alignment error e
rBe positioned at the theoretical calibration curve upper limit 8 and the zone that theoretical calibration curve lower limit 7 is surrounded, then return step 7, if the traffic alignment error e
rStill do not drop in the zone that the theoretical calibration curve upper limit 8 and theoretical calibration curve lower limit 7 surrounded, then continue to reconcile damper regulator 5 increasing the damping of pipe system, and continue to improve the rotating speed of buncher 2 simultaneously, make the flow that flows through flowmeter 4 reach Q
i, until making the traffic alignment error e
rTill dropping in the zone that the theoretical calibration curve upper limit 8 and theoretical calibration curve lower limit 7 surrounded, return step 7;
9, close normal flow detection system 6 and buncher 2.
As shown in Figure 6, in hydraulic rig for model test calibration pipe system, add damper regulator 5.When the water yield that pumps when make-up pump 1 under a certain rotating speed is stablized; Damper regulator 5 is not worked; Buncher 2 drags make-up pump 1 with in the water suction pipe system in the tank 3, and current are flowed through damper regulator 5, flowmeter 4 again through flowing back to tank 3 after the normal flow detection system 6.The water yield that pumps when make-up pump 1 is less and unstable situation occurs; Be the intersection point a place corresponding flow Qa of the damping curve 14 shown in Fig. 7 with the characteristic working curve 11 of make-up pump 1; The time; Damper regulator 5 is started working; Just under identical flow, the resistance of whole hydraulic rig for model test calibration pipe system can improve----simultaneously through the rotating speed of buncher 2 corresponding raising make-up pumps 1, has changed the damping curve of calibration pipe system and the characteristic working curve of make-up pump 1 in the damping----that improves whole hydraulic rig for model test calibration pipe system.When the characteristic working curve 13 intersection point d place corresponding flow of the make-up pump 1 after the damping curve 15 after damping characteristic changes improves with rotating speed also reach Qa; Because make-up pump 1 is operated in the negative slope stabilized zone of its characteristic working curve; Just can guarantee to get into this moment hydraulic rig for model test calibration system pipe system; Be flowmeter 4, flow stable, thus realized the purpose of reduction hydraulic rig for model test flowmeter 4 calibration errors from theoretical and engineering.
Principle of work: as shown in Figure 7; When not adopting method disclosed by the invention; Because the damping of hydraulic rig for model test flowmeter calibration pipe system can't be regulated, the damping curve 14 of pipeline only is the function of piping flow, i.e. the damping of certain flow lower pipeline is unmodifiable.Because the damping curve 14 of pipeline intersects the positive slope region at curve 11 with make-up pump 1 characteristic working curve 11 at lower-capacity point Qa place; The irregular operation district of make-up pump 1 just; Can't guarantee to pump into hydraulic rig for model test flowmeter calibration pipe system; Be flowmeter 4, discharge stable, thereby the calibration error of flowmeter 4 when low discharge increased.
After adopting method disclosed by the invention; In hydraulic rig for model test flowmeter 4 calibration pipe systems, increased damper regulator 5; Can increase the damping of pipe system through regulating damper regulator 5; Just under identical flow, improve the resistance of whole hydraulic rig for model test calibration pipe system, thereby squinted in damping curve 15 upper left side to Fig. 7 under identical flow of pipeline.Be for lower-capacity point Qa equally; Through after regulating damper regulator 5 the pipe system damping being increased; The damping curve 5 of pipeline is to the skew of the upper left side of Fig. 7; This moment, the pairing flow of intersection point of damping curve 15 and the characteristic working curve 11 of make-up pump 1 of pipeline was not Qa, but less than the flow value of Qa.In order to make flow reach the Qa point; The rotating speed of just necessary corresponding raising make-up pump 1; Make the characteristic working curve 11 of make-up pump 1 move to curve 13 places to the upper right side of Fig. 7, the damping curve 15 of pipeline also is Qa with the pairing flow of intersection point d of the characteristic working curve 13 of make-up pump 1 at this moment.Because the point of the low discharge Qa that intersection point d is corresponding on the curve 13 is positioned on the negative slope region; In the stable region of make-up pump 1 operation just; This has just guaranteed that from theoretical and engineering make-up pump 1 pumps into the stability of current the hydraulic rig for model test flowmeter calibration pipe system, thereby has reduced the calibration error at this flow down-off meter.
After adopting method disclosed by the invention, the flowmeter 4 in the hydraulic rig for model test as shown in Figure 6 is calibrated by following program:
1. start normal flow detection system 6 and buncher 2;
2. buncher 2 is stabilized in the interior a certain rotating speed operation down of range of operation of 300 ~ 1000 rev/mins make-up pump 1;
3. buncher 2 drives make-up pump 1 stable operation;
4. make-up pump 1 is in the water suction pipe system in the tank 3, and the current flowmeter 4 of flowing through flows back to tank 3 after through normal flow detection system 6 again, so moves in circles;
5. system stable operation is 10 minutes;
6. utilize normal flow detection system 6 to measure the flow value that flows through flowmeter 4 this moment, gather the output electric signal of flowmeter 4 simultaneously;
7. whether the calibration of judging flow is counted meets the demands, if, then change step 9 over to, otherwise, with the traffic alignment error e of flowmeter 4
rCompare with theoretical calibration curve lower limit 7 with the theoretical calibration curve upper limit 8: if calibration error e
rBe positioned at the theoretical calibration curve upper limit 8 and the scope that theoretical calibration curve lower limit 7 is surrounded,, adjust the pump water yield of rotating speed change make-up pump 1 in pipe system of buncher 2, promptly change the discharge that flows through flowmeter 4 then according to the flow difference of need calibration.The operation of repeating step 3 to step 6.In case certain low discharge Q
iCalibration error e
rBe positioned at outside the scope that the theoretical calibration curve upper limit 8 and theoretical calibration curve lower limit 7 surrounded, then execution in step 8;
8. damper regulator 5 actions increase the damping of pipe system, improve the rotating speed of buncher 2 simultaneously, make the flow that flows through flowmeter 4 reach Q
i, meanwhile, incite somebody to action the traffic alignment error e of flowmeter 4 this moment once more
rCompare with theoretical calibration curve lower limit 7 with the theoretical calibration curve upper limit 8, if the traffic alignment error e
rBe positioned at the theoretical calibration curve upper limit 8 and the zone that theoretical calibration curve lower limit 7 is surrounded, then return step 7, if the traffic alignment error e
rStill do not drop in the zone that the theoretical calibration curve upper limit 8 and theoretical calibration curve lower limit 7 surrounded, then continue to reconcile damper regulator 5 increasing the damping of pipe system, and continue to improve the rotating speed of buncher 2 simultaneously, make the flow that flows through flowmeter 4 reach Q
i, until making the traffic alignment error e
rTill dropping in the zone that the theoretical calibration curve upper limit 8 and theoretical calibration curve lower limit 7 surrounded.Return step 7;
9. close normal flow detection system 6 and buncher 2.
The calibration procedure that relatively installs the flowmeter 4 in the hydraulic rig for model test of damper regulator 5 front and back additional can be found; After adopting method disclosed by the invention; When the flowmeter in the hydraulic rig for model test 4 was calibrated, most steps were identical.Only when not adopting method disclosed by the invention, in case the traffic alignment error e of flowmeter 4 when low discharge occur
rWhen exceeding regional that the theoretical calibration curve upper limit 8 and theoretical calibration curve lower limit 7 surrounded, can only take the method for forbidding that flowmeter 4 uses under this flow, this has just greatly limited the scope of application of flowmeter 4.And after adopting method disclosed by the invention, removing needs in hydraulic rig for model test flowmeter calibration pipe system, to install additional outside the damper regulator 5, only need work as the traffic alignment error e of flowmeter 4 when low discharge
rWhen exceeding regional that the theoretical calibration curve upper limit 8 and theoretical calibration curve lower limit 7 surrounded, reconcile damper regulator 5 increasing the damping of pipe system, and improve the rotating speed of buncher 2 simultaneously, make the traffic alignment error e of this flow down-off meter 4
rDrop in the zone that the theoretical calibration curve upper limit 8 and theoretical calibration curve lower limit 7 surrounded, just can guarantee in whole flow range, all can normally use at flowmeter 4.
Comparison diagram 2 can be found with Fig. 8; After adopting method disclosed by the invention; The current that make-up pump 1 is got in the calibration pipe system still can be operated in the stabilized zone when low discharge; Avoid making the traffic alignment error e in the whole flow range because make-up pump 1 is operated in the wave phenomenon of current when low discharge in the entering calibration pipe system that unstable region causes
rAll be positioned at the zone that the theoretical calibration curve upper limit 8 and theoretical calibration curve lower limit 7 are surrounded, thereby on theoretical and engineering, all reached the purpose that has reduced hydraulic rig for model test flowmeter low discharge calibration error.
Claims (1)
1. method that reduces hydraulic rig for model test flowmeter low discharge calibration error is characterized in that: in hydraulic rig for model test flowmeter calibration pipe system, increase damper regulator (5), and operate by following program:
1. start normal flow detection system (6) and buncher (2);
2. buncher (2) is stabilized in the interior operation of range of operation of 300 ~ 1000 rev/mins make-up pump (1);
3. buncher (2) drives make-up pump (1) stable operation;
4. make-up pump (1) is in the water suction pipe system in the tank (3), and the current flowmeter (4) of flowing through flows back to tank (3) after through normal flow detection system (6) again, so moves in circles;
5. system stable operation is 10 minutes;
6. utilize normal flow detection system (6) to measure and flow through the flow value of gathering flowmeter (4) this moment, gather the output electric signal of flowmeter (4) simultaneously;
7. whether the calibration of judging flow is counted meets the demands, if, then change step (9) over to, otherwise, with the traffic alignment error e of flowmeter (4)
r----,
E wherein
rTraffic alignment error, Q for flowmeter (4)
mThe flow value, the Q that measure for normal flow detection system (6)
cThe flow value----of the flowmeter that calculates for the relation curve of the flow value that flows through flowmeter (4) measured according to the corresponding normal flow detection system of output electric signal (6) of the flowmeter (4) that goes out by least square fitting compares with the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7): if calibration error e
rBe positioned at the scope that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) are surrounded; Then different according to the flow of need calibration; The rotating speed of adjustment buncher (2) changes the pump water yield of make-up pump (1) in pipe system; Promptly change the discharge that flows through flowmeter (4), in case the operation of repeating step 3 to step 6 is certain low discharge Q
iCalibration error e
rBe positioned at outside the scope that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) surrounded, then execution in step 8;
8. damper regulator (5) action increases the damping of pipe system, improves the rotating speed of buncher (2) simultaneously, makes the flow that flows through flowmeter (4) reach Q
i, meanwhile, incite somebody to action the traffic alignment error e of flowmeter this moment (4) once more
rCompare with the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7), if the traffic alignment error e
rBe positioned at the zone that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) are surrounded, then return step 7, if the traffic alignment error e
rStill do not drop in the zone that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) surrounded; Then continue to reconcile damper regulator (5) to increase the damping of pipe system; And continue to improve the rotating speed of buncher (2) simultaneously, make the flow that flows through flowmeter (4) reach Q
i, until making the traffic alignment error e
rTill dropping in the zone that the theoretical calibration curve upper limit (8) and theoretical calibration curve lower limit (7) surrounded, return step 7;
9. close normal flow detection system (6) and buncher (2).
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| CN107687959A (en) * | 2017-11-01 | 2018-02-13 | 中山市华源电气设备有限公司 | Testing device and testing method for powder-brewing beverage machine |
| CN110567563A (en) * | 2019-08-15 | 2019-12-13 | 重庆市伟岸测器制造股份有限公司 | multi-calibration-line flowmeter calibration system and calibration method based on same |
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| CN102680059B (en) | 2013-11-06 |
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