CN110567563A - multi-calibration-line flowmeter calibration system and calibration method based on same - Google Patents
multi-calibration-line flowmeter calibration system and calibration method based on same Download PDFInfo
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- CN110567563A CN110567563A CN201910751830.0A CN201910751830A CN110567563A CN 110567563 A CN110567563 A CN 110567563A CN 201910751830 A CN201910751830 A CN 201910751830A CN 110567563 A CN110567563 A CN 110567563A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 254
- 230000007246 mechanism Effects 0.000 claims abstract description 52
- 230000001105 regulatory effect Effects 0.000 claims abstract description 31
- 238000005303 weighing Methods 0.000 claims description 48
- 230000007704 transition Effects 0.000 claims description 15
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 5
- 210000001503 joint Anatomy 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/14—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using a weighing apparatus
Abstract
The invention discloses a multi-calibration-line flowmeter calibration system and a calibration method based on the system, comprising a water supply mechanism and a calibration mechanism, wherein the calibration mechanism comprises at least 2 standard pipes, all the standard pipes are connected with the water supply mechanism, a standard pipe control valve and a standard flowmeter are arranged on the standard pipes, the water outlet ends of all the standard pipes are connected with the same first collecting pipe, the first collecting pipe is connected with at least 2 calibration pipes, N to-be-detected flowmeters are connected in series on the calibration pipes, a calibration pipe control valve is also arranged on the calibration pipes, all the calibration pipes are connected with the same flow regulating mechanism, as a plurality of calibration pipes are adopted in the system, a plurality of to-be-detected flowmeters are arranged on each calibration pipe, when any one calibration pipe is independently opened, the plurality of to-be-detected flowmeters can be calibrated at one time, different calibration pipes are respectively opened, and different flowmeters can be calibrated, therefore, the flow meter calibration in a production line manner is realized, and the calibration time is greatly saved.
Description
Technical Field
The invention relates to the technical field of flowmeter calibration, in particular to a flowmeter calibration system with multiple calibration lines and a calibration method based on the system.
Background
The water meter is calibrated before delivery, and can be delivered after being qualified, and the existing calibration methods comprise a volume method, a weighing method and a standard flowmeter method. The volumetric method is to discharge water with constant instantaneous flow by using a calibration device, enter a standard container after passing through a water meter to be calibrated, and compare the values of the water meter and the standard container after a period of time. The weighing method is that the weighed weight is converted into the volume of water by an electronic scale and then is compared with the reading of the water meter. The standard flowmeter method is to compare a standard flowmeter with a water meter to be calibrated in series.
The calibration modes are all carried out in a laboratory, and the traditional laboratory water meter calibration mode can only calibrate one meter to be detected at a time, so that the calibration efficiency is low and the cost is high.
Disclosure of Invention
In view of this, the present invention provides a calibration system for a flow meter with multiple calibration lines and a calibration method based on the system, which can calibrate multiple flow meters simultaneously.
The technical scheme is as follows: one is as follows:
The utility model provides a flowmeter calibration system of many calibration lines which the key lies in: comprises a water supply mechanism and a calibration mechanism;
The water supply mechanism comprises a reservoir, the reservoir is connected with L first water supply pipes, L is a natural number, the water outlet ends of all the first water supply pipes are connected with the same pressure stabilizing tank, and water pumps are mounted on the first water supply pipes;
The calibration mechanism includes P standard pipe, and P is more than or equal to 2's integer, all standard pipe intake the end with the surge tank is connected, install standard pipe control valve and standard flowmeter on the standard pipe, the delivery end of all standard pipes is connected with same first collecting pipe, and this first collecting pipe is connected with 2 at least calibration pipes, it has N to wait to examine the flowmeter to establish ties on the calibration pipe, and N is the natural number, still install calibration pipe control valve on the calibration pipe, all calibration union coupling have same flow adjustment mechanism.
by adopting the technical scheme, the flow in the calibration pipe can be adjusted by the flow adjusting mechanism, the display flow of the flowmeter to be detected is compared with that of the standard flowmeter, so that the flowmeter to be detected is calibrated.
Preferably, the first and second electrodes are formed of a metal,
above-mentioned water supply mechanism still includes the steady voltage pond, and this steady voltage pond is located the eminence, the cistern is located low department, the steady voltage pond through water pipe with the cistern is connected, be provided with water control valve on the water pipe, the K strip first delivery pipe is connected with the upper hose respectively, and K < L, the upper hose with the tie point of first delivery pipe is located the correspondence the water pump rear end, the outlet end of upper hose with the steady voltage pond is connected, install water control valve on the upper hose. Adopt above-mentioned structure, can realize the automatic water supply to the cistern through steady voltage pond, but the water in the cistern passes through the upper hose and flows back to the constant voltage pond, has realized the circulation flow of water.
Above-mentioned steady voltage pond includes overflow pond, constant voltage pond and the collecting basin of establishing toward the cover outward in proper order from the interior, the height that highly is greater than the constant voltage pond of overflow pond, the play water end of water-supply line with the overflow pond is connected, the end of intaking of water pipe is connected with the constant voltage pond, the collecting basin is connected with the wet return, the play water end of wet return with the cistern is connected. Adopt above-mentioned structure, the water in overflow pond can overflow to the constant voltage pond automatically after full, water level in the constant voltage pond all the time with pool opening parallel and level, unnecessary water can overflow to the catch basin in the constant voltage pond, and the water pressure in the constant voltage pond can remain stable all the time like this to realize stably supplying water.
The constant-pressure tank is connected with a second water supply pipe, the pressure stabilizing tank is connected with a transition pipe, the transition pipe is connected with a second collecting pipe, the water inlet ends of all standard pipes are connected with the second collecting pipe, the water outlet end of the second water supply pipe is connected with the transition pipe, a first water supply switch is arranged on the transition pipe in front of the connection point of the second water supply pipe and the transition pipe, and a second water supply switch is arranged on the second water supply pipe. By adopting the structure, when the small flow is calibrated, the water supply mode can be adopted, the water in the constant-pressure pool is directly supplied to each calibration pipe through the second water supply pipe, the water supply is stable, the calibration result is reliable, and the water is more economical and economical.
The calibration pipe comprises a pipeline base, and a fixed pipe section, a movable pipe section and an adjustable pipe section which are sequentially arranged on the pipeline base along the water flow direction;
The water inlet end of the fixed pipe section is connected with the first collecting pipe;
The movable pipe section comprises M movable pipes movably arranged on the pipe base through pipe supporting pieces, all the movable pipes are arranged along the same straight line, a flow meter clamp is slidably arranged on the pipe base between every two adjacent movable pipes, the flow meter clamp is detachably provided with the flow meter to be detected, the water inlet end and the water outlet end of the flow meter to be detected are respectively opposite to the movable pipes at the two ends of the flow meter to be detected, the movable pipes are connected with a jacking mechanism, and the corresponding movable pipes are jacked forwards by the jacking mechanism, so that the first movable pipe is butted with the water outlet end of the fixed pipe section at the front end of the movable pipe section, and the water inlet ends and the water outlet ends of all the flow meters to be detected are butted with the corresponding movable pipes respectively;
The adjustable pipe section is connected with the Mth movable pipeline.
by adopting the structure, the plurality of flowmeters to be calibrated and each section of movable pipeline are in a split structure, before calibration, after the flowmeters to be detected are arranged on the flowmeter clamp, first, a first jacking mechanism is started, so that a first movable pipeline is tightly butted with a fixed pipe section at the front end of the first movable pipeline, then other jacking mechanisms are started from front to back in sequence, so that the movable pipelines move forwards in sequence to jack, the flowmeter to be detected slides forwards passively through the sliding mechanism, two ends of the flow tube of the flowmeter to be detected are respectively and tightly butted with the adjacent movable pipelines, thereby realizing that all movable pipe sections and the flow meters to be detected are integrated into a whole, the flow meters to be detected can be detached and the next flow meters to be detected can be installed after the calibration is finished, the structure can realize the calibration of a plurality of flowmeters at one time, and the efficiency is greatly improved compared with the traditional single calibration.
The flow meter clamp comprises a clamp bottom plate, a slide rail is arranged on a pipeline base, the clamp bottom plate is fixedly mounted on a slide block of the slide rail, two flow meter supporting plates are arranged on the clamp bottom plate, mounting grooves are formed in the upper portions of the flow meter supporting plates, two ends of a flow tube of a flow meter to be detected are located in the two mounting grooves respectively, and connecting flanges at two ends of the flow tube are located in the outer sides of the flow meter supporting plates respectively and abut against the flow meter supporting plates. By adopting the structure, the to-be-detected flowmeter clamps the two flowmeter supporting plates through the connecting flange of the to-be-detected flowmeter, so that the to-be-detected flowmeter is fixed on the bottom plate of the clamp, and when the pushing mechanism pushes the movable pipeline forward, the to-be-detected flowmeter can slide forward together with the flowmeter clamp, thereby being beneficial to ensuring that the two ends of the flow tube and the movable pipeline are accurately butted.
The above-mentioned tight mechanism in top includes the tight board in top and the tight cylinder in top, wherein the tight board in top with but mobile pipeline fixed connection, the tight cylinder in top is followed but mobile pipeline's axial fixity install on the pipeline base, the tight cylinder in top the piston rod with the tight board fixed connection in top. By adopting the structure, the movable pipeline can be pushed to move forwards through the air cylinder, and the structure is simple, accurate and reliable.
The flow regulating mechanism comprises a third collecting pipe, the water outlet ends of all the calibration pipes are connected with the third collecting pipe, the third collecting pipe is connected with at least two flow regulating pipes, and flow regulating valves are installed on the flow regulating pipes. By adopting the structure, the flow passing through the calibration pipe can be adjusted by opening different flow control valves and controlling the opening degree of each flow control valve, so that the calibration of different flows of the same flowmeter to be detected is realized, and the calibration device can also adapt to the flow to be calibrated of the flowmeters to be detected with different specifications.
The rear end of the flow regulating mechanism is further provided with a weighing and calibrating mechanism, the weighing and calibrating mechanism comprises at least two weighing scales, a weighing water tank is installed on each weighing scale, one of the weighing water tanks is connected with one of the flow regulating pipes, the other flow regulating pipes are connected with a fourth collecting pipe, the fourth collecting pipe is connected with the other weighing water tanks through flow dividing pipes, and flow dividing control valves are installed on the flow dividing pipes. Adopt this structure, the water that comes out from the calibration pipe can get into the water tank of weighing and weigh, records the water weight that the water tank flowed in the certain time, converts the weight into the volume again to further calculate and obtain the instantaneous flow (be volume flow) in the unit interval, contrast this flow with the demonstration flow of standard flowmeter, can calibrate standard flowmeter, also can compare this flow with the demonstration flow of waiting to examine the flowmeter, thereby treat to examine the flowmeter and mark.
the above-mentioned water tank of weighing pass through the circulating pipe with the cistern is connected, install the drain valve on the circulating pipe, it is nth wait to examine the flowmeter rear end the calibration union coupling has the pressure release pipe, the pressure release pipe is connected with the trench, this trench with the circulation pond is connected, the pressure release pipe is installed the relief valve. By adopting the structure, when the standard meter is adopted to calibrate the flowmeter to be detected, water in the standard pipe can flow back to the reservoir through the trench, when the standard meter is calibrated by adopting a weighing method or the flowmeter to be detected is calibrated by adopting a weighing method, water in the weighing water tank can also flow back to the reservoir, and the water flow circularly flows, so that the economic cost is low.
The second step is as follows: the calibration method of the flowmeter calibration system based on the multiple calibration lines is characterized by comprising the following steps:
s1 sets the calibration line: selecting any one of the calibration pipes as a line to be calibrated, wherein the flowmeter to be detected on the line has i values to be calibrated, and the value is recorded as Qi,i＝1,2,3…n1Selecting any one of QiCalibrating;
S2 selecting water supply mode: counting the maximum water flow Q of the K water supply pipes connected with the water supply pipesKP
wherein Q ispump,pOf water pumpsPump flow rate;
If QKP≥QiSupplying water to the set calibration pipe through a second water supply pipe;
Otherwise, open L1A first water supply pipe passing through L1A first water supply pipe supplying water to the surge tank, L1L or less, further supplying water to the set calibration pipe through a surge tank, wherein L is1the following conditions are satisfied:
s3 setting the number of standard tubes: setting P1Strip of standard pipe, P1P is less than or equal to P, corresponding to P1A standard flowmeter is selected, P1The following conditions are satisfied:
wherein Q ismin,xminimum range of standard flowmeter, m3/h；Qmax,xMaximum range of standard flowmeter, m3/h；
s4 setting flow rate regulating and controlling pipe: opening a plurality of flow control valves, adjusting the opening of each flow control valve, and adjusting the display flow Q of each selected standard flowmeterbz,tWhich satisfies the following conditions:
And S5 calibration: respectively dividing N to be detected flow meters to display flow Qcd,jj is 1,2,3 … N, andComparing, if the difference value of the two values meets the calibration requirement, the calibration is finished, otherwise, the difference value of the two values is equal to the calibration requirementwriting the corresponding flowmeter to be detected;
S6 selection of other QsiCalibrating and repeating the steps S2-S5 until all Q valuesicompleting calibration;
S7: setting a new calibration circuit, and repeating the steps S1-S6 until the calibration is completed.
Technical scheme more than adopting, wait to examine the flowmeter installation on each calibration pipe and target in place the back, according to waiting to mark the size of flow and select suitable water supply mode, the preferred selection adopts constant voltage pond water supply, and is more economical, secondly the reselection adopts the cistern water supply, generally adopts when the flow that awaits measuring is bigger, and the different flow that awaits examining the flowmeter on the calibration pipe of same group, can select different water supply modes, match different standard flowmeters according to the flow size, compare with traditional calibration mode, calibration efficiency is higher, the cost is lower, the adaptability is wider.
compared with the prior art, the invention has the beneficial effects that: the system adopts a plurality of calibration pipes which are connected in parallel, a plurality of flow meters to be detected are installed on each calibration pipe, when any one calibration pipe is independently opened, the plurality of flow meters to be detected can be calibrated once, different calibration pipes are respectively opened, and different flow meters can be calibrated, so that the assembly line type flow meter calibration is realized, the calibration time is greatly saved, the calibration cost is reduced, the system can calibrate the standard flow meter or the flow meter to be detected by a weighing method, different calibration lines can be arbitrarily selected as required, and the calibration result is accurate and reliable.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment;
FIG. 2 is a schematic diagram of a calibration tube;
FIG. 3 is a schematic diagram of a movable pipe section;
FIG. 4 is a schematic view of a noise reducing hose;
FIG. 5 is a schematic structural view of a flowmeter clamp;
FIG. 6 is a schematic structural view of a flow meter support plate;
Fig. 7 is a schematic structural diagram of a pressure stabilizing pool.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Embodiment 1, as shown in fig. 1, a calibration system of a multi-calibration line flowmeter comprises a water supply mechanism 1 and a calibration mechanism 2;
The water supply mechanism 1 comprises a water reservoir 102, the water reservoir 102 is connected with L first water supply pipes 104, L is a natural number, the water outlet ends of all the first water supply pipes 104 are connected with the same surge tank 105, and the first water supply pipes 104 are provided with water pumps 103;
calibration mechanism 2 includes P parallelly connected standard pipe 201, and P is more than or equal to 2's integer, all standard pipe 201 intake end with surge tank 105 connects, install standard pipe control valve 201 and standard flowmeter 203 on the standard pipe 201, the play water end of all standard pipe 201 is connected with same first collecting pipe 211, and this first collecting pipe 211 is connected with 2 at least calibration pipes 204, it has N to examine flowmeter 205 to establish ties on the calibration pipe 204, and N is the natural number, still install calibration pipe control valve 206 on the calibration pipe 204, all calibration pipes 204 are connected with same flow adjustment mechanism.
The water supply mechanism 1 further comprises a pressure-stabilizing water tank 101, the pressure-stabilizing water tank 101 is located at a high position, the water storage tank 102 is located at a low position, the pressure-stabilizing water tank 101 is connected with the water storage tank 102 through a tap water pipe 112, a tap water control valve 107 and K water supply pipes 104 are arranged on the tap water pipe 112, the first water supply pipes 104 are respectively connected with water supply pipes 108, K is less than L, the water supply pipes 108 correspond to the connection points of the first water supply pipes 104 at the rear ends of the water pumps 103, the water outlet ends of the water supply pipes 108 are connected with the pressure-stabilizing water tank 101, and the water supply pipes 108 are provided with water supply control valves 109.
The water inlet end and the water outlet end of the water pump 103 are respectively communicated with corresponding pipelines through noise reduction hoses 114, as shown in fig. 4, the noise reduction hoses 114 are made of rubber, each noise reduction hose 114 comprises straight pipe portions 114a at two ends and a middle spherical pipe portion 114b, the spherical pipe portions 114b are in butt joint communication with the straight pipe portions 114a at two ends, the inner diameter of the spherical pipe portion 114b is larger than that of the straight pipe portions 114a, the two straight pipe portions 114a are respectively connected with the corresponding water pump and the corresponding water pipe, and it can be seen from the figure that the first water supply pipe 104 is further provided with a temperature sensor and a pressure transmitter, so that the first water supply pipe 104 is further provided with a manual valve for facilitating maintenance.
as shown in fig. 7, the pressure stabilizing water tank 101 includes an overflow tank 101a, a constant pressure tank 101b and a water collecting tank 101c, which are sequentially sleeved from inside to outside, the height of the overflow tank 101a is greater than that of the constant pressure tank 101b, the water outlet end of the water supply pipe 108 is connected to the overflow tank 101a, the water inlet end of the water supply pipe 112 is connected to the constant pressure tank 101b, the water collecting tank 101c is connected to a water return pipe 106, and the water outlet end of the water return pipe 106 is connected to the water reservoir 102.
As shown in fig. 1, the constant pressure tank 101b is connected to a second water supply pipe 110, the surge tank 105 is connected to a transition pipe, the transition pipe is connected to a second manifold 207, water inlet ends of all the standard pipes 201 are connected to the second manifold 207, a water outlet end of the second water supply pipe 110 is connected to the transition pipe, a first water supply switch 113 is disposed on the transition pipe in front of a connection point of the second water supply pipe 110 and the transition pipe, a second water supply switch 111 is disposed on the second water supply pipe 110, and a third water supply switch 202 is disposed on the standard pipe 201.
As shown in fig. 2,3, 5 and 6, the calibration pipe 204 includes a pipe base 204d, and a fixed pipe section 204a, a movable pipe section 204b and an adjustable pipe section 204c are sequentially arranged on the pipe base 204d along the water flow direction;
The water inlet end of the fixed pipe section 204a is connected with the first collecting pipe 211;
wherein movable pipe section 204b includes that M passes through pipe support piece 204e movable mounting and is in movable pipeline 204b1 on the pipeline base 204d, M is the natural number, and all movable pipeline 204b1 set up along same straight line, movable pipeline 204b1 can be along its axial displacement, and is adjacent between the movable pipeline 204b1 slidable mounting has flowmeter anchor clamps 204f on the pipeline base 204d, detachably installs on the flowmeter anchor clamps 204f the flowmeter 205 of examining, the inlet end and the outlet end of the flowmeter 205 of examining are relative rather than the movable pipeline 204b1 at its both ends respectively, movable pipeline 204b1 is connected with tight mechanism 204h in top, tight mechanism 204h in top pushes up corresponding movable pipeline 204b1 forward, thereby makes first movable pipeline 204b1 and its front end the outlet end butt joint of fixed pipe section 204a, The water inlet ends and the water outlet ends of all the flow meters 205 to be detected are respectively butted with the corresponding movable pipelines 204b 1;
The adjustable pipe segment 204c is connected to the mth movable pipe 204b 1.
the fixed pipe section 204a includes a fixed pipe 204a1, the fixed pipe 204a1 is fixedly installed on the pipe base 204d, the water inlet end of the fixed pipe 204a1 is connected to the first collecting pipe 211, the water outlet end of the fixed pipe 204a1 is butted with the 1 st movable pipe 204a1, the adjustable pipe section 204c includes an adjustable pipe 204c1 fixedly installed on the pipe base 204d, the front end of the adjustable pipe 204c1 is fixedly connected to the mth movable pipe 204b1, the rear end of the adjustable pipe 204c1 is connected to an expansion piece 204c2, and the fixed pipe 204a1 and the adjustable pipe 204c1 are respectively connected to a pressure transmitter 204k and a temperature sensor 204 g.
the flowmeter clamp 204f comprises a clamp bottom plate 204f1, a slide rail 204j is arranged on the pipeline base 204d, the clamp bottom plate 204f1 is fixedly installed on a slide block of the slide rail 204j, two flowmeter support plates 204f2 are arranged on the clamp bottom plate 204f1 in a right-facing manner, a semicircular installation groove 204f3 is formed in the upper portion of each flowmeter support plate 204f2, the inner diameter of each installation groove 204f3 is equal to the outer diameter of a flow tube 205a1 of the flowmeter 205 to be detected, two ends of the flow tube 205a1 of the flowmeter 205 to be detected are respectively located in the two installation grooves 204f3, and connecting flanges 205a2 at two ends of the flow tube 205a1 are respectively located on the outer sides of the corresponding flowmeter support plates 204f2 and abut against the corresponding flowmeter support plates 204f 2.
The jacking mechanism 204h comprises a jacking plate 204h1 and a jacking cylinder 204h2, wherein the jacking plate 204h1 is fixedly connected with the movable pipeline 204b1, in the embodiment, the jacking plate 204h1 is long, the middle of the jacking plate 204h1 is fixedly sleeved on the movable pipeline 204b1, two sides of the movable pipeline 204b1 are respectively provided with one jacking cylinder 204h2, the jacking cylinder 204h2 is fixedly installed on the pipeline base 204d along the axial direction of the movable pipeline 204b1, piston rods of the two jacking cylinders 204h2 are respectively and fixedly connected with two ends of the jacking plate 204h1, and a reinforcing plate 204h3 is connected between the movable pipeline 204b1 and the jacking plate 204h 1.
the pipeline supporting member 204e includes at least one pipeline supporting seat 204e1 fixedly mounted on the pipeline base 204d, in this embodiment, the pipeline supporting member 204e includes two pipeline supporting seats 204e1, the pipeline supporting seat 204e1 is mounted with sliding bearings, and the movable pipeline 204b1 is movably inserted into the sliding bearings.
As can be further seen from fig. 1, the flow regulating mechanism includes a third collecting pipe 208, the water outlet ends of the adjustable pipes 204c1 of all the calibration pipes 204 are connected with the third collecting pipe 208, at least two flow regulating pipes 209 are connected with the third collecting pipe 208, and a flow regulating valve 210 is installed on the flow regulating pipes 209.
As shown in fig. 1, a weighing calibration mechanism is further disposed at the rear end of the flow regulating mechanism, the weighing calibration mechanism includes at least two weighing scales, weighing water tanks 302 are mounted on the weighing scales, one of the flow regulating pipes 209 is connected to one of the weighing water tanks 302 on the weighing scale, the other flow regulating pipe 209 is connected to a fourth collecting pipe 301, the fourth collecting pipe 301 is connected to the other weighing water tanks 306 through flow dividing pipes 303, and flow dividing control valves 304 are mounted on the flow dividing pipes 303.
The weighing water tank 302 is connected with the water reservoir 102 through a circulating pipe 306, a drain valve 307 is installed on the circulating pipe 306, the calibration pipe 204 at the rear end of the nth flowmeter 205 to be detected is connected with a pressure relief pipe 305, specifically, the rear end of the adjustable pipe 204c1 is connected with the pressure relief pipe 305, the pressure relief pipe 305 is connected with a trench 308, the trench 308 is connected with the circulating pool 102, and the pressure relief pipe 305 is provided with a pressure relief valve.
When the reservoir 102 is connected to two or more first water supply pipes 104, the inner diameters of the water supply pipes are different, in this embodiment, 2 first water supply pipes 104 are connected to the reservoir 102, one of the first water supply pipes 104 is connected to the water supply pipe 108, the second collecting pipe 207 is connected to 5 standard pipes 201, the inner diameters of the standard pipes 201 are different, the ranges of the standard flowmeters 203 mounted on the different standard pipes 201 are also different, the first collecting pipe 211 is connected to 4 calibration pipes 204, the inner diameters of the calibration pipes 204 are also different, the different calibration pipes 204 are mounted with flowmeters 205 to be tested of different specifications and models, the third collecting pipe 208 is connected to 4 flow regulating pipes 209, and the inner diameters of the flow regulating pipes 209 are also different, so that more accurate regulation and control of flow can be achieved, the weighing calibration mechanism includes 4 weighing scales, and the range of each weighing scale is also different, wherein the smallest inner diameter of the flow regulating pipe 209 is connected to the weighing water tank 302 on the scale with the smallest measuring range .
Embodiment 2, a calibration method based on embodiment 1, is performed according to the following steps:
S1 sets the calibration line: selecting any one calibration pipe 204 as a line to be calibrated, opening a calibration pipe control valve 206 on the selected calibration pipe 204 to enable the calibration pipe to be in a passage state, closing other calibration pipe control valves 206, and enabling the flow meter 205 to be detected to have i flow rates to be calibrated, wherein the flow rates are marked as Qi,i＝1,2,3…n1Selecting any one of QiCalibration is carried out, and generally, 4 flows to be detected are provided, and are respectively Q1Minimum flow, Q2Dividing flow rate, Q3Common flow rate, Q4Overload flow, all flow units being m3/h；
s2 selecting water supply mode: the maximum water supply flow Q of the K first water supply pipes 104 connected with the water supply pipes 108 is countedKP
Wherein Q ispupm,ppump flow of the Water Pump, m3/h；
If QKP≥QiIf so, the water supply control valve 109 and the second water supply switch 111 are opened, and the K is passed1A first water supply pipe 104 supplies water to the overflow tank 101a through a water supply pipe 108 and further supplies water to the set calibration pipe 204 through a second water supply pipe 110 through a transit pipe, K1Is less than or equal to K, and
Otherwise, the water supply control valve 109 and the second water supply switch 111 are closed, and L is opened1A water pump 103 on the first water supply pipe 104, and a first water supply switch 113 through L1A first water supply pipe 104 supplies water to the surge tank 105, L1L, the fluid flows through the surge tank 105 to supply water to selected ones of the calibration tubes 204, L1The following conditions are satisfied:
S3 setting the number of standard tubes: setting P1A standard pipe 201, a standard pipe control valve 202, P opened thereon1P is less than or equal to P, corresponding to P1A standard flow meter 203 is selected, P1the following conditions are satisfied:
Wherein Q ismin,xminimum range of standard flowmeter, m3/h；Qmax,xmaximum range of standard flowmeter, m3/h；
S4 setting flow rate regulating and controlling pipe: opening a plurality of flow control valves 210, adjusting the opening of each flow control valve 210, and adjusting the display flow rate Q of each selected standard flowmeter 203bz,tWhich satisfies the following conditions:
and S5 calibration: record the selected calibration tube 204Display flow rate Q of N flow meters 205 to be testedcd,jj is 1,2,3 … N, and N of the flow meters under test 205Q are used respectivelycd,jandComparing, if the difference value of the two values meets the calibration requirement, the calibration is finished, otherwise, the difference value of the two values is equal to the calibration requirementwriting into the corresponding flowmeter to be detected 205;
s6 selection of other QsiCalibrating and repeating the steps S2-S5 until all Q valuesiCompleting calibration;
S7, pressure relief: after the calibration is finished, the water pump 103 and the corresponding calibration pipe control valve 206 are closed, and the pressure release valve is opened;
s8: and selecting and setting a new calibration line, and repeating the steps S1-S7 until all the to-be-calibrated flowmeters 205 on the calibration pipe 204 are calibrated.
the standard flowmeter 203 needs to be calibrated every T days, and the calibration method is basically the same as the steps of calibrating the flowmeter 205 to be detected, and specifically includes the following steps:
S1 sets calibration line: opening the set standard pipe control valve 202 on the standard pipe 201 to enable the standard pipe to be in a passage state, closing other standard pipe control valves 202, wherein the standard flowmeter 203 to be calibrated has j flow rates to be calibrated, and the flow rate is marked as Qj,j＝1,2,3…n2Selecting any one of QjCarry out calibration
s2 selecting water supply mode: the maximum water supply flow Q of the K first water supply pipes 104 connected with the water supply pipes 108 is countedKP
Wherein Q ispupm,pPump flow of the Water Pump, m3/h；
If QKP≥Qjif so, the water supply control valve 109 and the second water supply switch 111 are opened, and the K is passed1A first water supply pipe 104 feeds water through a water supply pipe 108The overflow tank 101a is filled with water and further supplies the set calibration pipe 204 with water through a transit pipe via a second water supply pipe 110, K1Is less than or equal to K, and
Otherwise, the water supply control valve 109 and the second water supply switch 111 are closed, and L is opened2a water pump 103 on the first water supply pipe 104, and a first water supply switch 113 through L2A first water supply pipe 104 supplies water to the surge tank 105, L2l or less, further supplying water to the selected calibration pipe 204 through a pressure stabilizing tank 105, wherein L is2Satisfies the following conditions
S3 setting flow rate regulating and controlling pipe: after flowing out from the selected standard pipe 203, the fluid enters the flow regulating mechanism through any one or more calibration pipes 204, the plurality of flow regulating valves 210 are opened, the opening degree of each flow regulating valve 210 is controlled, and the display flow of the standard flowmeter 203 to be calibrated is regulated to be Qxsmake Q bexs＝Qj；
S4 weighing: the maximum measuring range of each weighing scale is marked as Gi，i＝1,2,3…n3The mass m of the fluid flowing through the standard pipe 203 in t minutes is calculated,
m＝ρQj×t÷60
wherein, rho-fluid density, kg/m3；
M and each Gicomparing G with Githe weighing scale corresponding to the minimum positive number obtained by the m is selected as the weighing scale of the weighing calibration, the shunt control valve 304 of the corresponding weighing scale is opened to communicate the flow regulating pipe 209 with the corresponding weighing water tank 302, and the actual mass m of the fluid flowing into the corresponding weighing water tank 302 within t minutes is recorded0and calculates the actual flow rate Q through the reference flow meter 2030Calculated according to the following formula:
Q0＝km0÷(ρ×t)
Where k is a calibration constant that is related to the temperature of the fluid. The flowmeter to be detected is used for measuring water flow, wherein k is the relation between water temperature and density, and for example, at 0 ℃, k is 0.9998; k is 0.9980 at 20 ℃; at 25 ℃, k is 0.9968, and the relationship between water temperature and density is prior art and is not described herein;
S5 comparison: the actual flow rate Q0Comparing the flow rate with the display flow rate of the standard flowmeter 203 to be calibrated, if the difference value of the two accords with the metering regulation, finishing the calibration, otherwise, judging the actual flow rate Q0Writing to the corresponding standard flow meter 203.
Others Q of the Standard flowmeter 203jThe calibration method and the calibration of the other standard flowmeters 203 are the same as above, and will not be described in detail here.
Alternatively, the flowmeter 205 to be tested may be calibrated by a weighing calibration mechanism in substantially the same manner as the standard meter method, except that the fluid is finally introduced into a weighing tank, the actual flow rate is calculated by weighing (see calibrated S4 and S5), and the actual flow rate is compared with the display flow rate Q of the flowmeter 205 to be testedcd,jAnd (4) comparing.
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a flowmeter calibration system of many calibration lines which characterized in that: comprises a water supply mechanism (1) and a calibration mechanism (2);
The water supply mechanism (1) comprises a water storage tank (102), the water storage tank (102) is connected with L first water supply pipes (104), L is a natural number, the water outlet ends of all the first water supply pipes (104) are connected with the same pressure stabilizing tank (105), and a water pump (103) is mounted on each first water supply pipe (104);
Calibration mechanism (2) include P standard pipe (201), and P is more than or equal to 2's integer, all standard pipe (201) intake end with surge tank (105) are connected, install standard pipe control valve (202) and standard flowmeter (203) on standard pipe (201), the play water end of all standard pipe (201) is connected with same first collecting pipe (211), and this first collecting pipe (211) are connected with 2 at least calibration pipe (204), it waits to examine flowmeter (205) to establish ties N on calibration pipe (204), and N is the natural number, still install calibration pipe control valve (206) on calibration pipe (204), and all calibration pipe (204) are connected with same flow adjustment mechanism.
2. The multi-calibration line flowmeter calibration system of claim 1, wherein: water supply mechanism (1) still includes steady voltage pond (101), and this steady voltage pond (101) are located the eminence, cistern (102) are located low, steady voltage pond (101) through water pipe (112) with cistern (102) are connected, be provided with water control valve (107) on water pipe (112), the K strip first delivery pipe (104) are connected with water pipe (108) respectively, and K < L, water pipe (108) with the tie point of first delivery pipe (104) is located the correspondence water pump (103) rear end, the water outlet end of water pipe (108) with steady voltage pond (101) are connected, water pipe (108) are last to install water control valve (109).
3. the multi-calibration line flowmeter calibration system of claim 2, wherein: steady voltage pond (101) include overflow pond (101a), constant voltage pond (101b) and catch basin (101c) of establishing toward outer cover in proper order from interior, the height that highly is greater than constant voltage pond (101b) of overflow pond (101a), the play water end of last water pipe (108) with overflow pond (101a) are connected, the end of intaking of water pipe (112) is connected with constant voltage pond (101b), catch basin (101c) are connected with wet return (106), the play water end of wet return (106) with cistern (102) are connected.
4. The multi-calibration-line flowmeter calibration system as set forth in claim 2 or 3, wherein: the constant pressure tank (101b) is connected with a second water supply pipe (110), the pressure stabilizing tank (105) is connected with a transition pipe, the transition pipe is connected with a second collecting pipe (207), the water inlet ends of all standard pipes (201) are connected with the second collecting pipe (207), the water outlet end of the second water supply pipe (110) is connected with the transition pipe, a first water supply switch (113) is arranged on the transition pipe in front of the connection point of the second water supply pipe (110) and the transition pipe, and a second water supply switch (111) is arranged on the second water supply pipe (110).
5. The multi-calibration line flowmeter calibration system of claim 1,2, or 3, wherein: the calibration pipe (204) comprises a pipe base (204d), and a fixed pipe section (204a), a movable pipe section (204b) and an adjustable pipe section (204c) which are sequentially arranged on the pipe base (204d) along the water flow direction;
The water inlet end of the fixed pipe section (204a) is connected with the first collecting pipe (211);
Wherein movable pipe section (204b) include that M passes through pipeline support piece (204e) movable mounting and is in movable pipeline (204b1) on pipeline base (204d), all movable pipeline (204b1) set up along same straight line, and are adjacent movable pipeline (204b1) between slide mounting has flowmeter anchor clamps (204f) on pipeline base (204d), detachably install on flowmeter anchor clamps (204f) the flowmeter (205) of examining, the inlet end and the outlet end of the flowmeter (205) of examining are relative rather than movable pipeline (204b1) at its both ends respectively, movable pipeline (204b1) are connected with and push up tight mechanism (204h), push up tight mechanism (204h) with corresponding movable pipeline (204b1) forward, thereby make first movable pipeline (204b1) with its front end the outlet end butt joint of fixed pipe section (204a) is connected to, The water inlet ends and the water outlet ends of all the flow meters to be detected (205) are respectively butted with the corresponding movable pipelines (204b 1);
the adjustable pipe section (204c) is connected with the Mth movable pipeline (204b 1).
6. The multi-calibration line flowmeter calibration system of claim 5, wherein: the jacking mechanism (204h) comprises a jacking plate (204h1) and a jacking cylinder (204h2), wherein the jacking plate (204h1) is fixedly connected with the movable pipeline (204b1), the jacking cylinder (204h2) is fixedly installed on the pipeline base (204d) along the axial direction of the movable pipeline (204b1), and a piston rod of the jacking cylinder (204h2) is fixedly connected with the jacking plate (204h 1).
7. The multi-calibration line flowmeter calibration system of claim 4, wherein: the flow regulating mechanism comprises a third collecting pipe (208), the water outlet ends of all the calibration pipes (204) are connected with the third collecting pipe (208), the third collecting pipe (208) is connected with at least two flow regulating pipes (209), and flow regulating valves (210) are installed on the flow regulating pipes (209).
8. The multi-calibration line flowmeter calibration system of claim 7, wherein: flow adjustment mechanism rear end still is provided with the calibration mechanism of weighing, and this calibration mechanism of weighing includes two at least weighing scale, install weighing water tank (302) on the weighing scale, one of them flow control pipe (209) and one of them weighing water tank (302) on the weighing scale are connected, other flow control pipe (209) are connected with fourth collecting pipe (301), and this fourth collecting pipe (301) pass through shunt tubes (303) respectively with other weighing water tank (306) are connected, install reposition of redundant personnel control valve (304) on shunt tubes (303).
9. The multi-calibration line flowmeter calibration system of claim 8, wherein: weighing water tank (302) through circulating pipe (306) with the cistern (102) is connected, install drain valve (307) on circulating pipe (306), the Nth wait to examine the calibration pipe (204) of examining flowmeter (205) rear end and be connected with pressure release pipe (305), pressure release pipe (305) are connected with trench (308), this trench (308) with circulation pond (102) are connected, pressure release valve is installed to pressure release pipe (305).
10. A calibration method for a multi-calibration line flowmeter calibration system according to claim 9, comprising the steps of:
S1 sets the calibration line: selecting any one of the calibration tubes(204) As a line to be calibrated, the flow meter (205) to be calibrated on the line has i values to be calibrated, which are marked as Qi,i＝1,2,3…n1Selecting any one of QiCalibrating;
S2 selecting water supply mode: the maximum water supply flow Q of the K first water supply pipes (104) connected with the water supply pipes (108) is countedKP
wherein Q ispump,pThe pump flow rate of the water pump;
If QKP≥QiSupplying water to the set calibration pipe (204) through a second water supply pipe (110);
Otherwise, open L1a first water supply pipe (104) passing through L1A first water supply pipe (104) for supplying water to the surge tank (105), L1less than or equal to L, further supplying water to the set calibration pipe (204) through a pressure stabilizing tank (105), wherein L is1The following conditions are satisfied:
S3 setting the number of standard tubes: setting P1Strip of standard pipe (201), P1p is less than or equal to P, corresponding to P1A standard flowmeter (203) is selected, P1The following conditions are satisfied:
Wherein Q ismin,xIs the minimum range of a standard flow meter; qmax,xThe maximum measuring range of the standard flowmeter;
S4 setting flow rate regulating and controlling pipe: opening a plurality of flow control valves (210), adjusting the opening of each flow control valve (210), and adjusting the display flow rate Q of each selected standard flowmeter (203)bz,tWhich satisfies the following conditions:
and S5 calibration: respectively measuring the display flow rate Q of N flow meters (205) to be detectedcd,jj is 1,2,3 … N, andComparing, if the difference value of the two values meets the calibration requirement, the calibration is finished, otherwise, the difference value of the two values is equal to the calibration requirementWriting the corresponding flow meter to be detected (205);
s6 selection of other QsiCalibrating and repeating the steps S2-S5 until all Q valuesiCompleting calibration;
S7: setting a new calibration circuit, and repeating the steps S1-S6 until the calibration is completed.
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