CN204085644U - A kind of flow calibrating device - Google Patents

A kind of flow calibrating device Download PDF

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Publication number
CN204085644U
CN204085644U CN201420439534.XU CN201420439534U CN204085644U CN 204085644 U CN204085644 U CN 204085644U CN 201420439534 U CN201420439534 U CN 201420439534U CN 204085644 U CN204085644 U CN 204085644U
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China
Prior art keywords
pipeline
valve
calibrating
flow
flowmeter
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CN201420439534.XU
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Chinese (zh)
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吴建峰
赵建东
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SHENZHOU OBSERVATION AND CONTROL EQUIPMENT CO Ltd
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SHENZHOU OBSERVATION AND CONTROL EQUIPMENT CO Ltd
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Abstract

The utility model discloses a kind of flow calibrating device, described flow calibrating device comprises the inlet pipeline, calibrating pipeline and the outlet pipeline that connect successively along water (flow) direction, and described inlet pipeline is provided with suction pump; Be connected with flowmeter in the middle part of described signal piping, described flowmeter is connected with differential pressure transmitter; Described rising pipe outlet end is provided with switch, the by-pass pipe that the delivery outlet two ends of described switch are communicated with Container respectively and are communicated with reservoir; Described Container is connected with the drainpipe be communicated with reservoir, described drainpipe is provided with draw-off valve; Described detector tube is also provided with platinum resistance temp transmitter and pressure transducer, and the calibrating pipeline in described flowmeter downstream is provided with vent valve.By reasonably designing pipeline structure, and in pipeline, set up platinum resistance temp transmitter and pressure transducer flowmeter, and vent valve is set on the calibrating pipeline in downstream, the precision of calibration equipment can be improved, and ensure stable.

Description

A kind of flow calibrating device
Technical field
The utility model relates to a kind of flow calibrating device.
Background technology
As everyone knows, existing flowmeter needs the accuracy being carried out sensed flow meter by certain detection in process of production.The precision of flow calibrating device and quality height all can have influence on the authenticity detecting data, making fewer mistakes in actual use, just must design a nested structure simple to guarantee all flows, stable, the flow calibrating device that precision is higher.Prior art is badly in need of a kind of rational in infrastructure, stable, the flow calibrating device that precision is higher.
Summary of the invention
The purpose of this utility model is to overcome the defect existed in prior art, provides a kind of rational in infrastructure, stable, the flow calibrating device that precision is higher.
For achieving the above object, the technical solution of the utility model there is provided a kind of flow calibrating device, described flow calibrating device comprises the inlet pipeline, calibrating pipeline and the outlet pipeline that connect successively along water (flow) direction, described inlet pipeline open end immerses reservoir, and described inlet pipeline is provided with suction pump; Be connected with flowmeter in the middle part of described signal piping, described flowmeter is connected with differential pressure transmitter; Described rising pipe outlet end is provided with switch, the by-pass pipe that the delivery outlet two ends of described switch are communicated with Container respectively and are communicated with reservoir; Described Container is connected with the drainpipe be communicated with reservoir, described drainpipe is provided with draw-off valve; Described detector tube is also provided with platinum resistance temp transmitter and pressure transducer, and the calibrating pipeline in described flowmeter downstream is provided with vent valve.By reasonably designing pipeline structure, and in pipeline, set up platinum resistance temp transmitter and pressure transducer flowmeter, and vent valve is set on the calibrating pipeline in downstream, the precision of calibration equipment can be improved, and ensure stable.
As preferably, between described outlet pipeline and calibrating pipeline, be provided with pressure-regulating valve.Such design is convenient to regulate the hydrodynamic pressure in calibrating pipeline.
As preferably, described Container is 60 cubic metres of metals capacity devices.Such design is the further optimization to scheme.
As preferably, described vent valve is arranged on high level or the high spot of calibrating pipeline.Bubble coalescence in pipeline and discharge are convenient in such design.
As preferably, described inlet pipeline comprises the first pipeline and the second pipeline that connect successively along water (flow) direction, the first suction pump that described first pipeline comprises first input end, the first output terminal and is arranged between first input end and the first output terminal; The second suction pump that described second pipeline comprises the second input end, the second output terminal and is arranged between the second input end and the second output terminal;
The first valve is provided with between described first pipeline and the second pipeline; The output terminal of described first pipeline and the output terminal of the second pipeline are connected with the 3rd pipeline, and described 3rd pipeline is provided with the second valve; Described first pipeline input end and the second pipeline input end are provided with the 4th pipeline, and described 4th pipeline is provided with the 3rd valve.The selection of suction pump is convenient in such design.
As preferably, described 4th pipeline is communicated with the second pipeline output terminal by the 5th pipeline.Such design is avoided causing damage to the pump housing during body internal drainage.
Advantage of the present utility model and beneficial effect are: by reasonably designing pipeline structure, and in pipeline, set up platinum resistance temp transmitter and pressure transducer flowmeter, and vent valve is set on the calibrating pipeline in downstream, the precision of calibration equipment can be improved, and ensure stable.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
In figure: 1, inlet pipeline; 2, pipeline is examined and determine; 3, outlet pipeline; 4, reservoir; 5, flowmeter; 6, differential pressure transmitter; 7, switch; 8, by-pass pipe; 9, drainpipe; 10, draw-off valve; 11, platinum resistance temp transmitter; 12, pressure transducer; 13, vent valve; 14, pressure-regulating valve; 15,60 cubic metres of metals capacity devices; 16, the first pipeline; 17, the second pipeline; 18, first input end; 19, the first output terminal; 20, the first suction pump; 21, the second input end; 22, the second output terminal; 23, the second suction pump; 24, the first valve; 25, the second valve; 26, the 3rd valve; 27, the 4th valve; 28, the 3rd pipeline; 29, the 4th pipeline; 30, the 5th pipeline.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection domain of the present utility model with this.
As shown in Figure 1, a kind of flow calibrating device, described flow calibrating device comprises the inlet pipeline 1, calibrating pipeline 2 and the outlet pipeline 3 that connect successively along water (flow) direction, and described inlet pipeline 1 open end immerses reservoir 4, and described inlet pipeline 1 is provided with suction pump; Be connected with flowmeter 5 in the middle part of described signal piping, described flowmeter 5 is connected with differential pressure transmitter 6; Described rising pipe outlet end is provided with switch 7, the by-pass pipe 8 that the delivery outlet two ends of described switch 7 are communicated with Container respectively and are communicated with reservoir 4; Described Container is connected with the drainpipe 9 be communicated with reservoir 4, described drainpipe 9 is provided with draw-off valve 10; Described detector tube is also provided with platinum resistance temp transmitter 11 and pressure transducer 12, the calibrating pipeline 2 in described flowmeter 5 downstream is provided with vent valve 13.
Flowmeter 5 level is arranged on calibrating pipeline 2, and guarantees that the sealing gasket at the joint flange place between flowmeter 5 and calibrating pipeline 2 extends in pipeline section without protrusion.Exhausr port is set in the appropriate position of the calibrating pipeline 2 in flowmeter 5 downstream, to get rid of the intrasystem air of calibrating pipeline 2.
Pressure-regulating valve 14 is provided with between described outlet pipeline 3 and calibrating pipeline 2.
Described Container is 60 cubic metres of metals capacity devices 15.
The digital pressure gauge that 60 cubic metres of metal tanks in flowmeter 5 verification system, platinum resistance temperature take into account the Rosemount differential pressure transmitter 6 of all measurements of calibrating each pair of pressure tap difference all has constitutional law to determine the calibration certificate of calibrating agency, and all calibration certificates before the deadline.
Described vent valve 13 is arranged on high level or the high spot of calibrating pipeline 2.
Described inlet pipeline 1 comprises the first pipeline 16 and the second pipeline 17 connected successively along water (flow) direction, and described first pipeline 16 comprises first input end 18, first output terminal 19 and is arranged on the first suction pump 20 between first input end 18 and the first output terminal 19; Described second pipeline 17 comprises the second input end 21, second output terminal 22 and is arranged on the second suction pump 23 between the second input end 21 and the second output terminal 22; Two water pump (2 × 100kW) maximum flows are 0.6 m 3/ s, the most high-lift is 10m.Reservoir 4 storage capacity is 250 m 3.
The first valve 24 is provided with between described first pipeline 16 and the second pipeline 17; The output terminal of described first pipeline 16 and the output terminal of the second pipeline 17 are connected with the 3rd pipeline 28, and described 3rd pipeline 28 is provided with the second valve 25; Described first pipeline 16 input end and the second pipeline 17 input end are provided with the 4th pipeline 29, and described 4th pipeline 29 is provided with the 3rd valve 26.
Described 4th pipeline 29 is communicated with the second pipeline 17 output terminal by the 5th pipeline 30, and described 5th pipeline 30 is provided with the 4th valve 27.
In use, according to the demand of actual conditions and test fluid pressure, need the pump housing of choice for use, when the first suction pump 20 and the second suction pump 23 are all opened, need the first valve 24 to open, the second valve 25, the 3rd valve 26, the 4th valve 27 are closed; Fluid enters calibrating pipeline 2 from the first pipeline 16, first valve 24, second pipeline 17 successively;
If unlatching first suction pump 20 or the second suction pump 23 can be selected when only need open a pump housing; When unlatching the first suction pump 20, need closedown first valve the 24, the 3rd valve 26, the 4th valve 27, open the second valve 25, fluid is from first input end 18, first output terminal 19, the 3rd pipeline 28(second valve 25), the second output terminal 22 enter calibrating pipeline 2;
When unlatching the second suction pump 23, need closedown first valve 24, second valve 25, the 4th valve 27, open the 3rd valve 26, fluid is from first input end 18, the 4th pipeline 29(the 3rd valve 26), the second input end 21, second output terminal 22 enter calibrating pipeline 2;
When sluicing, need closedown first valve 24, second valve 25, the 3rd valve 26, open the 4th valve 27, fluid is from the second output terminal 22, the 5th pipeline 30(the 4th valve 27), the first pipeline 16 input end enters reservoir 4.
Verification process is as follows:
1, confirm flowmeter 5 installation qualification on calibrating pipeline 2, start water pump (water pump is chosen with reference to above), make to be full of water in pipeline, and flow back to reservoir 4 by by-pass pipe 8 road.Open the intrasystem air of vent valve 13 discharge line on calibrating pipeline 2.
2, the output voltage (adopting zero) of the dead head condition of flowmeter 5 is examined and determine by the mode of three valve group valves on blowdown of a safety valve transmitter.
3, in 60 cubic metres of metal tanks, cut water, make 60 cubic metres of amount of metal walls fully invade profit.
4, regulate the running status of water pump to desired flow.To 60 cubic metres of metal tank 15 inscribe water initial liquid level that extremely a certain liquid level is lower, after stable level, read initial liquid level value.
5, the system stable operation sufficiently long time is treated, after the equipment such as pressure difference transmitter, temperature transmitter stable output, in 60 cubic metres of metal tanks, water is cut fast by switch 7, timer starts timing, the output valve of the pressure difference transmitter on data acquisition unit Real-time Collection flowmeter 5 pressure tap simultaneously.
6, after in 60 cubic metres of metal tanks 15, water is injected into predetermined water level, water is switched back to by-pass pipe 8 tunnel by switch 7 fast, and timer and data acquisition simultaneously also stops gathering.After the stable level in 60 cubic metres of metal tanks 15, read final liquid level.
7, the calibrating data of this ranging are graphically shown on computers.From then on preliminary judgement is carried out to the correctness of the verification result of this ranging.
8, regulate the running status of water pump to next flow, repeat 1 to 7, until all ranging calibrating is complete.
The calibrating of flowmeter 5 adopts volumetric method, and the precision with 60 cubic metres of metal tanks (diameter is φ 4.8, and height is 3.4m) of vernier-read instrument is ± 0.08%.Two cylinders drive switch 7 to work, and are switched to by the water flowing through flowmeter 5 in 60 cubic metres of metal tanks, and trigger travel switch simultaneously and make timer start timing, the precision of travel switch is 0.001 second.When a ranging terminates, current by switchback by-pass pipe 8 road time, timer stops timing simultaneously.The data acquisition unit record time used.
Use paper tinsel resistance temperature to become and send measurement water temperature, with the pressure in gauge measurement calibrating pipeline 2, this is to calculate water-mass density.
The operational formula used in measurement relates to following:
A, volumetric flow rate q vcomputing formula
Q v= wherein: q v--volumetric flow rate (m 3/ s); The final liquid level (mm) of h1--60 cubic meter metal tank; The initial liquid level (mm) of h0--60 cubic meter metal tank 15; Calibration factor (the m of k--60 cubic metres of metal tanks 15 3/ mm); The time (s) of a T--ranging.
B, throat's reynolds number Re d
Re d= = wherein: Re d--throat's Reynolds number; The average velocity (m/s) of water in V1--pipeline; --the kinematic viscosity (㎡/s of water); --diameter ratio, =d/D; D--throat diameter (m); Nozzle flowmeter 5 upstream line internal diameter (m) under D--condition of work; q m--mass rate (kg/s), q m=pv ﹒ q v; p v-- density (the kg/ m of water in 60 cubic metres of metal tanks 3); --the kinetic viscosity (p of water a﹒ s).
C ,efflux coefficient C i
C i= wherein: p--differential pressure (p a); ρ 1--the density (kg/m of flowmeter 5 throat place's water in certain ranging 3);
D ,the computing formula of flowmeter 5 efflux coefficient linearity error δ 1:
E ,the computing formula of flowmeter 5 fundamental error δ:
In formula: the fundamental error of δ s-flowrate calibrating device.Can ignore when it is less than 1/3rd of flowmeter 5 fundamental error.
f,the reproducibility error δ of flowmeter 5 2ibe calculated as follows (6):
wherein: C ijflowmeter 5 efflux coefficient that each measurement point is measured for each time;
C ithe average efflux coefficient of-each measurement point flowmeter 5;
In formula: n-pendulous frequency.
Get each measurement point δ 2imaximal value as the reproducibility error δ of sensor 2*.
* the reproducibility error determined according to above formula is to compare with similar instrument, not as tolerance statistically.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing from the front lower of the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (6)

1. a flow calibrating device, is characterized in that: described flow calibrating device comprises the inlet pipeline, calibrating pipeline and the outlet pipeline that connect successively along water (flow) direction, and described inlet pipeline open end immerses reservoir, and described inlet pipeline is provided with suction pump; Be connected with flowmeter in the middle part of described signal piping, described flowmeter is connected with differential pressure transmitter; Described rising pipe outlet end is provided with switch, the by-pass pipe that the delivery outlet two ends of described switch are communicated with Container respectively and are communicated with reservoir; Described Container is connected with the drainpipe be communicated with reservoir, described drainpipe is provided with draw-off valve; Described detector tube is also provided with platinum resistance temp transmitter and pressure transducer, and the calibrating pipeline in described flowmeter downstream is provided with vent valve.
2. flow calibrating device as claimed in claim 1, is characterized in that: be provided with pressure-regulating valve between described outlet pipeline and calibrating pipeline.
3. flow calibrating device as claimed in claim 2, is characterized in that: described Container is 60 cubic metres of metals capacity devices.
4. flow calibrating device as claimed in claim 3, is characterized in that: described vent valve is arranged on high level or the high spot of calibrating pipeline.
5. flow calibrating device as claimed in claim 4, it is characterized in that: described inlet pipeline comprises the first pipeline and the second pipeline that connect successively along water (flow) direction, the first suction pump that described first pipeline comprises first input end, the first output terminal and is arranged between first input end and the first output terminal; The second suction pump that described second pipeline comprises the second input end, the second output terminal and is arranged between the second input end and the second output terminal;
The first valve is provided with between described first pipeline and the second pipeline; The output terminal of described first pipeline and the output terminal of the second pipeline are connected with the 3rd pipeline, and described 3rd pipeline is provided with the second valve; Described first pipeline input end and the second pipeline input end are provided with the 4th pipeline, and described 4th pipeline is provided with the 3rd valve.
6. flow calibrating device as claimed in claim 5, is characterized in that: described 4th pipeline is communicated with the second pipeline output terminal by the 5th pipeline.
CN201420439534.XU 2014-08-06 2014-08-06 A kind of flow calibrating device Active CN204085644U (en)

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CN201420439534.XU CN204085644U (en) 2014-08-06 2014-08-06 A kind of flow calibrating device

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109855705A (en) * 2018-08-01 2019-06-07 常州市计量测试技术研究所 A kind of the oil flowmeter calibrating installation and calibration method of real-time dynamic compensation temperature variation
CN112833030A (en) * 2021-01-08 2021-05-25 扬州大学 Pump station field flow monitoring method based on front-located shaft type water inlet flow channel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109855705A (en) * 2018-08-01 2019-06-07 常州市计量测试技术研究所 A kind of the oil flowmeter calibrating installation and calibration method of real-time dynamic compensation temperature variation
CN112833030A (en) * 2021-01-08 2021-05-25 扬州大学 Pump station field flow monitoring method based on front-located shaft type water inlet flow channel

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