CN210719346U - Flowmeter calibration system of many calibration lines - Google Patents
Flowmeter calibration system of many calibration lines Download PDFInfo
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- CN210719346U CN210719346U CN201921322153.2U CN201921322153U CN210719346U CN 210719346 U CN210719346 U CN 210719346U CN 201921322153 U CN201921322153 U CN 201921322153U CN 210719346 U CN210719346 U CN 210719346U
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Abstract
The utility model discloses a flowmeter calibration system with multiple calibration lines, which comprises 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 installed 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 on the calibration pipes in series, the calibration pipes are also provided with calibration pipe control valves, all the calibration pipes are connected with the same flow regulating mechanism, the system adopts a plurality of calibration pipes in parallel, each calibration pipe is provided with a plurality of to-be-detected flowmeters, when any one calibration pipe is independently opened, the plurality of to-be-detected flowmeters can be calibrated once, different calibration pipes are respectively opened, different flowmeters can be calibrated, thereby realizing the calibration of the assembly line type flowmeters, greatly saving the calibration time.
Description
Technical Field
The utility model relates to a flowmeter calibration technical field, concretely relates to flowmeter calibration system of many calibration lines.
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.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a flowmeter calibration system of many calibration lines adopts this system can mark a plurality of flowmeters simultaneously.
The technical scheme 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 a first water supply pipe, the water outlet end of the first water supply pipe is connected with a pressure stabilizing tank, and a water pump is mounted on the first water supply pipe;
the calibration mechanism includes 2 at least standard pipes, all standard pipes 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 pipe connections 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,
the water supply mechanism further comprises a pressure stabilizing water tank, the pressure stabilizing water tank is located at a high position, the water storage tank is located at a low position, the pressure stabilizing water tank is connected with the water storage tank through a tap water pipe, a tap water control valve is arranged on the tap water pipe, a water feeding pipe is connected with the water feeding pipe, the water outlet end of the water feeding pipe is connected with the pressure stabilizing water tank, and the water feeding pipe is provided with a water feeding control valve. 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, can overflow automatically to the constant voltage pond after higher overflow pond's water is full, water level in the constant voltage pond all the time with pool mouth 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 it is stable to ensure water supply water pressure.
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 to be detected is detachably arranged on the flow meter clamp, 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, 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.
Adopt above-mentioned structure, be split type structure between a plurality of flowmeters that wait to mark and each section movable pipeline, will wait to examine before the mark the flowmeter and install the back on the flowmeter anchor clamps, at first start first tight mechanism in top, thereby make first movable pipeline closely dock with the fixed pipeline section of its front end, then in the past backward start other tight mechanism in top in proper order, thereby make each movable pipeline move forward in proper order and push up tightly, and wait to examine the flowmeter and slide forward passively through slide mechanism, wait to examine the flowmeter's flow pipe both ends respectively with adjacent movable pipeline closely dock, thereby realize waiting all movable pipeline sections with wait to examine the flowmeter and integrate into a whole, can wait to examine the flowmeter and examine the mark after finishing and examine the mark of examining the flowmeter and install next batch and examine the flowmeter, this structure once can realize the mark of a plurality of flowmeters, mark efficiency promotes greatly.
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 2 flow regulating pipes, and the flow regulating pipes are provided with flow regulating valves. 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 flow regulating pipes are connected with a fourth collecting pipe, the fourth collecting pipe is connected with the rest 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 cistern 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.
Compared with the prior art, the beneficial effects of the utility model are that: the system adopts a plurality of calibration pipes which are connected in parallel, a plurality of flowmeters to be detected are installed on each calibration pipe, when any one calibration pipe is independently opened, the flowmeters to be detected can be calibrated once, different calibration pipes are respectively opened, and different flowmeters can be calibrated, so that the assembly line type flowmeter calibration is realized, the calibration time is greatly saved, the calibration cost is reduced, the system can calibrate the standard flowmeter or the flowmeter to be detected by a weighing method, different calibration methods 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 accompanying drawings.
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, the water outlet end of the first water supply pipe 104 is connected with a surge tank 105, and a water pump 103 is mounted on the first water supply pipe 104;
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 is arranged on the tap water pipe 112, water can be replenished through the tap water pipe 112 when the water level of the water storage tank 102 is lower than a preset water level, the number of the K water supply pipes 104 is connected with a water supply pipe 108(K is smaller than L), the water outlet end of the water supply pipe 108 is connected with the pressure-stabilizing water tank 101, and the water supply pipe 108 is provided with a water supply control valve.
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 pipe 204b1 on the pipeline base 204d, M is the natural number, and all movable pipe 204b1 set up along same straight line, movable pipe 204b1 can be along its axial displacement, and is adjacent between the movable pipe 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 movable pipe 204b1 at both ends respectively, movable pipe 204b1 is connected with tight mechanism 204h in top, tight mechanism 204h in top will correspond movable pipe 204b1 is tight in the forward top, thereby makes first movable pipe 204b1 with 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.
In this embodiment, the fixed pipe segment 204a includes a fixed pipe 204a1, the fixed pipe 204a1 is fixedly mounted 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 segment 204c includes an adjustable pipe 204c1 fixedly mounted 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 unit 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 2 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 scales, the remaining flow regulating pipes 209 are connected to fourth collecting pipes 301, the fourth collecting pipes 301 are respectively connected to the remaining weighing water tanks 302 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 flow meter 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 water reservoir 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 first water supply pipes 104 are different, in this embodiment, the reservoir 102 is connected to 2 first water supply pipes 104, the inner diameters of the standard pipes 201 are different, the ranges of the standard flowmeters 203 mounted on different standard pipes 201 are also different, the inner diameters of the calibration pipes 204 are also different, the different calibration pipes 204 can be mounted with flowmeters 205 to be tested of different specifications and models, and the inner diameters of the flow regulating pipes 209 are also different, so that more accurate regulation and control of flow can be realized, and the ranges of the weighing scales are also different, wherein the flow regulating pipe 209 with the smallest inner diameter is connected to the weighing water tank 302 on the weighing scale with the smallest range.
The method for calibrating the flowmeter to be detected by adopting a standard meter method comprises 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: counting the maximum water supply flow Q of the K first water supply pipes (104) connected with the water supply pipe 108KP
Wherein Q ispupm,pPump flow of the Water Pump, m3/h；
If QKP≥QiIf yes, the upper water control valve 109 and the second water supply switch 111 are opened, and water is supplied to the set calibration pipe 204 through the second water supply pipe 108;
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 P1Strip of standard pipe 201, opening standard pipe control valve, P1P 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: recording the displayed flow rate Q of the N meters 205 to be tested on the selected calibration pipe 204cd,jJ is 1,2,3 … N, and N of the flow meters under test 205Q are used respectivelycd,jAnd
comparing, 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 requirement
Writing 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 on the standard pipe 201 to enable the standard pipe control valve to be in a passage state, closing other standard pipe control valves, and enabling the standard flowmeter 203 to be calibrated to have j flow rates to be calibrated, which are marked as Qj,j＝1,2,3…n2Selecting any one of QjCarry out calibration
S2 selecting water supply mode: counting the maximum water supply flow Q of the K first water supply pipes (104) connected with the water supply pipe 108KP
Wherein Q ispupm,pPump flow of the Water Pump, m3/h；
If QKP≥QbIf yes, the upper water control valve 109 and the second water supply switch 111 are opened, and water is supplied to the selected calibration pipe 204 through the second water supply pipe 108;
otherwise, the water supply control valve 109 and the second water supply switch 111 are closed, and the water supply valve is openedL2 A 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 of the selected standard pipe 203, the fluid enters a flow regulating mechanism through any one or more than one of the standard pipes, a 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 Q0And to be calibratedComparing the displayed flow of the standard flowmeter 203, if the difference value of the two accords with the metering regulation, finishing the calibration, otherwise, judging the actual flow 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 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 the 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 reservoir (102), the water reservoir (102) is connected with a first water supply pipe (104), the water outlet end of the first water supply pipe (104) is connected with a pressure stabilizing tank (105), and a water pump (103) is installed on the first water supply pipe (104);
calibration mechanism (2) include 2 at least standard pipes (201), all standard pipes (201) intake the end with surge tank (105) are connected, install standard pipe control valve and standard flowmeter (203) on standard pipe (201), the play water end of all standard pipes (201) is connected with same first collecting pipe (211), and this first collecting pipe (211) are connected with 2 at least calibration pipes (204), it has N to wait to examine flowmeter (205) to establish ties on calibration pipe (204), and N is the natural number, still install calibration pipe control valve (206) on calibration pipe (204), and all calibration pipes (204) are connected with same flow adjustment mechanism.
2. The multi-calibration line flowmeter calibration system of claim 1, wherein: 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) is arranged on the tap water pipe (112), a water feeding pipe (108) is connected to the first water feeding pipe (104), the water outlet end of the water feeding pipe (108) is connected with the pressure stabilizing water tank (101), and a water feeding control valve (109) is installed on the water feeding pipe (108).
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 of claim 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 between movable pipeline (204b1) slidable mounting has flowmeter anchor clamps (204f) on pipeline base (204d), detachably on flowmeter anchor clamps (204f) install the flowmeter (205) of examining, the inlet end and the outlet end of 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) will correspond movable pipeline (204b1) forward push up, thereby make first movable pipeline (204b1) with its front end the outlet end butt joint of fixed pipe section (204a) is, 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: flowmeter anchor clamps (204f) include anchor clamps bottom plate (204f1), be provided with slide rail (204j) on pipeline base (204d), anchor clamps bottom plate (204f1) fixed mounting be in on the slider of slide rail (204j), just be provided with two flowmeter backup pads (204f2) on anchor clamps bottom plate (204f1), mounting groove (204f3) have been seted up on the upper portion of flowmeter backup pad (204f2), the flow tube (205a1) both ends of examining flowmeter (205) are located respectively in two mounting groove (204f3), flange (205a2) at flow tube (205a1) both ends are located the corresponding outside of flowmeter backup pad (204f2) respectively to support tightly in the correspondence on flowmeter backup pad (204f 2).
7. 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).
8. The multi-calibration line flowmeter calibration system of claim 1, 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 2 flow regulating pipes (209), and flow regulating valves (210) are installed on the flow regulating pipes (209).
9. The multi-calibration line flowmeter calibration system of claim 8, wherein: the flow control 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, and are remaining flow control pipe (209) are connected with fourth collecting pipe (301), and this fourth collecting pipe (301) pass through shunt tubes (303) respectively with the surplus weighing water tank (302) are connected, install reposition of redundant personnel control valve (304) on shunt tubes (303).
10. The multi-calibration line flowmeter calibration system of claim 9, 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 the cistern (102) is connected, pressure release valve is installed to pressure release pipe (305).
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| CN115388985A (en) * | 2022-08-09 | 2022-11-25 | 上海核工程研究设计院有限公司 | Flowmeter calibration system and method under complex flow environment |
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| CN115388985A (en) * | 2022-08-09 | 2022-11-25 | 上海核工程研究设计院有限公司 | Flowmeter calibration system and method under complex flow environment |
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