CN101556181A - Composite static start-stop method mass flowmeter calibration system - Google Patents
Composite static start-stop method mass flowmeter calibration system Download PDFInfo
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- CN101556181A CN101556181A CNA2009100226083A CN200910022608A CN101556181A CN 101556181 A CN101556181 A CN 101556181A CN A2009100226083 A CNA2009100226083 A CN A2009100226083A CN 200910022608 A CN200910022608 A CN 200910022608A CN 101556181 A CN101556181 A CN 101556181A
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Abstract
The invention relates to a composite static start-stop method mass flowmeter calibration system which is used for checking the flow rate of a mass flowmeter, is a calibrating apparatus adopting the mass flowmeter that is nationally and legally prescribed and can check the main characteristics and accuracy index of the mass flowmeter. The calibration system comprises a water tank, a current stabilizer, a regulating valve, stop valves and an electronic scale, and is characterized in that a flow rate pump set is connected between the water tank and the current stabilizer, the two sides of the flowmeter to be measured are respectively connected with standard flowmeter sets, the two ends of the regulating valve are respectively provided with the stop valves, one end thereof is connected with the water tank, and the other end is connected with the current stabilizer which is connected with a weighing container; the standard flowmeter sets, the flowmeter to be measured, the regulating valve and the electronic scale are connected with a computer. The calibration system has the advantages of weighing method and standard scale method, so as to have high accuracy in calibration and working efficiency and the like; furthermore, a static start-stop method is adopted to calibrate the mass flowmeter, so that the accuracy error caused by inconsonant positive and negative strokes of a steering gear can be avoided.
Description
Technical field
The present invention relates to a kind of composite static start-stop method mass flowmeter calibration system.
Technical background
For the accurate metering of the flow instrument of ensuring the quality of products, mass flowmeter dispatch from the factory preceding, use in, all must regularly test or verification after safeguarding its metering performance.Mass flowmeter is carried out the flow verification, is exactly the mass rate metering calibrating installation that adopts country legal, the check work that its key property and accuracy index are carried out.
Existing mass flowmeter calibration cartridge is equipped with weight method and method of standard table.
For mass flowmeter, the most suitable scaling method is a weight method.Weight method is examined and determine process flow diagram as shown in Figure 1, and there is following problem in it:
When 1, using weight method, because dynamically the working method of start and stop method is not consistent with the actual field working method, when therefore the mass flowmeter of demarcating in production firm is applied to actual field, because working environment and mode conversion to some extent cause the operating characteristic of mass flowmeter to have deviation, precision decreases.
When 2, using weight method, because the positive and negative journey time of commutator certainly exists error, this has just influenced the trueness error of whole calibrating system, and can not avoid this error by changing or improve commutator.
When 3, using weight method,, make segment fluid flow will residue in the pipeline, therefore will cause the precision of calibration system to produce error because ducted fluid can not inject the container of weighing fully.
When 4, using weight method,, therefore need reduce error, cause the staking-out work cycle longer, demarcate inefficiency, be unfavorable for the large batch of work production of production firm by the bigger flow of weighing owing to will improve the precision of demarcation.
The method of standard table flow calibration device characteristics such as have simple in structure, high efficiency, economical and practical of comparing with other flow calibration device, its method of standard table calibrating process flow diagram as shown in Figure 2, there is following problem in it:
When 1, using method of standard table, the precision of tested mass flowmeter will depend on the precision of standard quality flowmeter, be subjected to the restriction of standard quality flowmeter accuracy grade, so stated accuracy is lower.
When 2, using method of standard table,, just need the mass flowmeter of a superhigh precision to do standard scale, and the price of the mass flowmeter of superhigh precision is higher, therefore is unfavorable for reducing cost if will improve stated accuracy.
When 3, using method of standard table,, will cause the whole calibrating system reliability to reduce, to such an extent as to systemic breakdown can't carry out staking-out work again in case standard scale serious deviation occurs or breaks down.
When 4, using method of standard table, be precision and the reliability of guaranteeing system, need regularly standard scale to be carried out verification, therefore strengthened workload.
When 5, using method of standard table, the range of tested mass flowmeter does not often conform to the range of standard quality flowmeter, has so just caused unnecessary trueness error.
Summary of the invention
The object of the invention is to provide a kind of composite static start-stop method mass flowmeter calibration system, can comprehensively realize separately advantage of weight method and method of standard table, overcome its shortcoming, realizes high precision, high-level efficiency, the high reliability of system.
For achieving the above object the technical scheme that the present invention takes:
The present invention includes water tank, current regulator, variable valve, stop valve, electronic scales, the container of weighing, its special character is: also comprise flow pump group, constant-current stabilizer, computing machine; Connection traffic pump group between described water tank and the current regulator, the both sides of flowmeter to be measured connect the proving flowmeter group respectively, and the two ends of variable valve are provided with stop valve respectively, and stop valve is connected with water tank, and stop valve is connected with constant-current stabilizer, and constant-current stabilizer connects the container of weighing; Described proving flowmeter group, flowmeter to be measured, variable valve, electronic scales all are connected with computing machine.
Above-mentioned flow pump group is composed in parallel by three different flow pumps of power.
Above-mentioned proving flowmeter group is composed in parallel by the high precision mass flowmeter that three ranges do not wait, quantity 〉=2 that the proving flowmeter group is provided with.
Between the above-mentioned flowmeter to be measured and the proving flowmeter group of both sides tensimeter is set respectively, tensimeter is connected with computing machine.
Above-mentioned computing machine connects barometer and environment temperature meter.
The trunk line and the horizontal level of above-mentioned constant-current stabilizer are angled, and trunk line top connects and connects shunt conduit, are responsible for road junction welding umbrella buffering umbrella.
The trunk line of above-mentioned constant-current stabilizer becomes 30 degree angles with horizontal level.
Beneficial effect of the present invention:
The present invention has received weight method and method of standard table advantage separately, the stated accuracy height, and work efficiency is high, and what adopt is that static start-stop method comes the calibration mass flowmeter, has avoided the inconsistent trueness error that causes of the positive revesal of steering gear; And working method conforms to the practical application condition, and its operating characteristic gets the nod; Two standard sets table group before and after this system is furnished with can be carried out preferably, has improved the precision of demarcation and the reliability of system; Two standard sets table group can onlinely be carried out real-time verification by electronic scales, has improved system reliability, has reduced workload; The standard scale of different ranges can be flowmeter to be measured in the standard scale group provides a standard scale that is complementary with its range that it is demarcated, and has effectively improved stated accuracy; Aspect pipe design, also carry out particular design, improved precision and stability that total system is demarcated.
Description of drawings
Fig. 1 is the weight method calibrating process flow diagram of standard;
Fig. 2 is the method for standard table calibrating process flow diagram of standard;
Fig. 3 is a principle assumption diagram of the present invention;
Fig. 4 is a standard quality flowmeter group structural drawing of the present invention;
Fig. 5 is a flow pump group structural drawing of the present invention;
Fig. 6 is a constant-current stabilizer structural drawing of the present invention.
Among the figure: 1-water tank 2-flow pump group 3- current regulator 4,9,10,17-stop valve
The 5-flowmeter 6-to be measured variable valve 7-container 8-electronic scales of weighing
11-computing machine 12-commutator 13-bypass device 14,15-proving flowmeter group
The 16-constant-current stabilizer.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 3, the present invention includes water tank 1, current regulator 3, variable valve 6, stop valve 4,9,10,17, electronic scales 8, connection traffic pump group 2 between described water tank 1 and the current regulator 3, the both sides of flowmeter 5 to be measured connect proving flowmeter group 14,15 respectively, the two ends of variable valve 6 are provided with stop valve 9,10 respectively, one end is connected with water tank 1, and the other end is connected with constant-current stabilizer 13, and constant-current stabilizer 16 connects the container 7 of weighing; Described proving flowmeter group 14,15, flowmeter to be measured 5, variable valve 6, electronic scales 8 all are connected with computing machine 11.
Referring to Fig. 4, proving flowmeter group 14,15 is composed in parallel by the high precision mass flowmeter that three ranges do not wait, the proving flowmeter that can select during work to be complementary with flowmeter 5 ranges to be measured is measured, make the range of demarcation consistent, and can be operated in the optimum measurement sensitivity flow range of low relatively error, be the calibration accuracy of the flowmeter of ensuring the quality of products, the mass flowmeter precision of proving flowmeter group should be better than 1/3 of tested mass flowmeter limit of intrinsic error in the system.
Quantity 〉=2 that proving flowmeter group 14,15 is provided with, last proving flowmeter group 14 is used for examining and determine the reliability of total system, and back one proving flowmeter group 15 is used for calibrating mass flowmeter to be calibrated, effectively raises the reliability and the precision of demarcation like this.
Two standard sets flowmeter group 14,15 can be treated measurement of discharge meter 5 simultaneously and demarcate, and calibration mutually, improves the stated accuracy and the reliability of system.
Referring to Fig. 5, flow pump group 2 is composed in parallel by three different flow pumps of power, can adopt different flow pumps to be complementary with it to different flow ranges during work, make flow pump be operated in ideal region, regime flow reduces systematic error, flow pump group 2 can be calibration system stable flow rate is provided, and improves the reliability of system.
In order to eliminate the influence of aerostatic buoyancy symmetry heavy amount, computing machine 11 connection barometers and environment temperature instrumentation amount are tested the pressure and temperature of on-the-spot atmosphere, and the pressure and temperature data are input to computing machine 11, so that the influence of aerostatic buoyancy is revised.
Between the proving flowmeter group 14,15 of flowmeter 5 to be measured and both sides tensimeter is set respectively, tensimeter is connected with computing machine, the pressure loss when tensimeter can detect liquid stream by mass flowmeter 5 to be measured or the pressure differential between the gateway.
The present invention connects constant-current stabilizer 16 and is used for compensating water hammer effect, ducted liquid is earlier by behind the bigbore trunk line (its inwall is very smooth) during system calibrating, the container 7 of weighing reinjects, alleviated the impulsive force of flow, and a umbrella buffering of welding umbrella in the container 7 of weighing, make liquid dispersion by slowly flowing into the container of weighing all around, eliminated fluid electronic scale 8 has been impacted caused error, 7 mouthfuls in the container of weighing simultaneously is semiclosed, prevent leaked liquid and evaporation, guarantee weighing precision, and on trunk line, add a small-bore shunt conduit, after stopping to measure, be used for to the trunk line liquid make-up, after guaranteeing to stop each time measuring, the liquid level position unanimity in the trunk line.
The trunk line of constant-current stabilizer 16 becomes 30 degree angles with horizontal level, prevent liquid residue in pipeline, improves the stated accuracy of system.
The present invention does not use dynamic start and stop method, but used static start-stop method, therefore avoided the time error of the positive revesal of commutator, effectively reduced calibrated error, the duty of static start-stop method more is close to reality of work simultaneously, particularly the hair oil site of deployment is very approaching on oil field individual well metering and the hair oil platform, and the easier actual environment that is adapted to of mass flowmeter through this system detects or demarcates makes the people be sure of its operating characteristic.
The present invention can be operated under two kinds of mode of operations, can use electronic scales 8 during high-precision calibrating, not only can demarcate mass flowmeter 5 simultaneously all right standard verification mass flowmeter groups 14,15 to be measured; When carrying out timing signal in enormous quantities, can close stop valve 9, only use two standard sets mass flowmeter group 14,15 to treat mass metering flowmeter 5 and demarcate, after finishing a measuring period, each data transmission is carried out data analysis in computing machine.If the data error of first group of standard scale and second group of standard scale less than the experience error, then should be organized the credible effective reservation of data; If data error, then should be organized data greater than the experience error with disallowable.Compare by trust data and flowmeter to be measured 5 gained data, can obtain by the calibration coefficient of calibration mass flowmeter or correction factor.
Embodiment 1
When stop valve 9 is opened, when stop valve 10 was closed, system works was under the static start-stop method mode.Flow pump group 2 is selected and the flow pump of wanting the calibrational capacity point to conform to, standard quality flowmeter group 14,15 is selected and the corresponding to standard quality flowmeter of mass flowmeter 5 ranges to be measured, during work, fluid in the water tank 1 is extracted out by flow pump, and fluid steadily injects the containers 7 of weighing by first group of standard quality flowmeter 14, mass flowmeter to be measured 5, second group of standard quality flowmeter 16 and constant-current stabilizer 16.After finishing a measuring period, turn-off liquid stream by stop valve 9, electronic scales 8 is that ponderable quantity flows into the liquid quality of container 7 and data are sent in the computing machine 11 of weighing.First group of standard quality flowmeter 14, mass flowmeter to be measured 5, second group of data that standard quality flowmeter 15 respectively records are compared analysis with the data of electronic scales 8 gained respectively, can obtain the correction factor of first group of standard quality flowmeter 14, mass flowmeter to be measured 5, second group of standard quality flowmeter 15 respectively, so neither influence the carrying out of staking-out work, also can regularly test to two standard sets mass flowmeter 14,15, guarantee the precision of staking-out work, liquid after weighing flow back into water tank 1 by stop valve 17 controls.
When stop valve 9 is closed, when stop valve 10 is opened, system works under two method of standard table demarcation modes, during work, the standard quality flowmeter that can artificially select the range with mass flowmeter 5 to be measured to be complementary.Fluid in the water tank 1 is extracted out by flow pump, and fluid is by first group of standard quality flowmeter 14, mass flowmeter to be measured 5, second group of standard quality flowmeter 15, then direct reflow tank 1.After finishing a measuring period, each data transmission is carried out data analysis in computing machine 11.If the data error of first group of standard scale and second group of standard scale less than the experience error, then should be organized the credible effective reservation of data; If data error, then should be organized data greater than the experience error with disallowable, compare by trust data and flowmeter gained data to be measured, can obtain by the calibration coefficient of calibration mass flowmeter or correction factor.
Claims (7)
1, composite static start-stop method mass flowmeter calibration system, it comprises water tank (1), current regulator (3), variable valve (6), stop valve (4,9,10,17), electronic scales (8), the container of weighing (7), it is characterized in that: also comprise flow pump group (2), constant-current stabilizer (16), computing machine (11); Connection traffic pump group (2) between described water tank (1) and the current regulator (3), the both sides of flowmeter to be measured (5) connect proving flowmeter group (14,15) respectively, the two ends of variable valve (6) are provided with stop valve (9,10) respectively, stop valve (10) is connected with water tank (1), stop valve (9) is connected with constant-current stabilizer (13), and constant-current stabilizer (16) connects the container (7) of weighing; Described proving flowmeter group (14,15), flowmeter to be measured (5), variable valve (6), electronic scales (8) all are connected with computing machine (11).
2, composite static start-stop method mass flowmeter calibration according to claim 1 system, it is characterized in that: described flow pump group (2) is composed in parallel by three different flow pumps of power.
3, composite static start-stop method mass flowmeter calibration according to claim 1 and 2 system, it is characterized in that: described proving flowmeter group (14,15) is composed in parallel by the high precision mass flowmeter that three ranges do not wait, quantity 〉=2 that proving flowmeter group (14,15) is provided with.
4, composite static start-stop method mass flowmeter calibration according to claim 3 system, it is characterized in that: the proving flowmeter group of described flowmeter to be measured (5) and both sides is provided with tensimeter respectively between (14,15), and tensimeter is connected with computing machine (11).
5, composite static start-stop method mass flowmeter calibration according to claim 4 system is characterized in that: described computing machine (11) connects barometer and environment temperature meter.
6, composite static start-stop method mass flowmeter calibration according to claim 5 system, it is characterized in that: the trunk line and the horizontal level of described constant-current stabilizer (16) are angled, trunk line top connects and connects shunt conduit, is responsible for road junction welding umbrella buffering umbrella.
7, composite static start-stop method mass flowmeter calibration according to claim 6 system is characterized in that: the trunk line of described constant-current stabilizer (16) becomes 30 degree angles with horizontal level.
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| CNA2009100226083A CN101556181A (en) | 2009-05-20 | 2009-05-20 | Composite static start-stop method mass flowmeter calibration system |
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| CNA2009100226083A CN101556181A (en) | 2009-05-20 | 2009-05-20 | Composite static start-stop method mass flowmeter calibration system |
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