Portable method of standard table flowmeter calibrating installationTechnical field
The present invention relates to the technical field of calibrating installation, specifically a kind of portable method of standard table flowmeter calibrating installation.
Background technology
Flowmeter English name is flowmeter, and national scientific and technical terminology validation board is defined as it: instruction measured flux and (or) the instrument in selected time interval inner fluid total amount.Be exactly a kind of instrument for fluid flow in measuring channel or open channel in simple terms, conventional unit m3/h in engineering, it can be divided into instantaneous delivery (FlowRate) and integrated flow (TotalFlow), instantaneous delivery and the unit interval interior amount crossing closed conduct or open channel free area, the material flow through can be gas, liquid, solid; Integrated flow is (one day, one week, January, 1 year) fluid within a certain period of time interval and flows through the cumulative amount of closed conduct or open channel free area.Also integrated flow can be tried to achieve to time integral, so also can mutually transform between instantaneous flowmeter and flow quantity recorder by instantaneous delivery.
Flowmeter is widely used among industrial and agricultural production, national defense construction, scientific research foreign trade and people's lives every field.Flowmeter needs the medium of transmission to be liquid or gaseous state, and flowmeter belongs to and easily consumes article, when occurring that when flowmeter uses at the scene error or needs are calibrated, often need flowmeter to disassemble and deliver to flowmeter manufacturing enterprise and calibrate, this often wastes time and energy, not only delay man-hour, efficiency is lower, cost improves greatly simultaneously, and in transportation, also can have influence on precision and the reliability of flowmeter, make the calibrated flowmeter returned after dismounting, transport there is the problem of service precision difference, poor stability.Therefore be badly in need of wanting a kind of flowmeter that can be applied in process automation flow process, use medium that is liquid or gaseous state at the scene, the device of directly comparing and calibrating, meanwhile, the result of calibration has accuracy and the trackability of height.
Such as application number is " 200810241313.0 ", name is called that " system for calibrating ultrasonic flowmeter by time difference method " describes such technical scheme and " the invention provides a kind of system for calibrating ultrasonic flowmeter by time difference method, it comprises water tank, variable valve, water pump, buffer tank, variable valve, pipeline and multiple standard detection platform position, described water tank, variable valve, water pump, buffer tank, variable valve and pipeline form flow closed circuit, described pipeline comprises small-bore pipeline and large diameter pipeline, the axial two ends of described small-bore pipeline comprise probe, between this small-bore pipeline and large diameter pipeline, there is certain angle.The ultrasonic flow meter under (calibrating) equivalent large diameter pipeline is calibrated by small-bore pipeline." but described calibration system cannot be applied to scene carries out detection calibration, and all there is certain defect in the precision of simultaneously calibrating, stability and the scope of application.
Summary of the invention
The object of the present invention is to provide a kind of portable method of standard table flowmeter calibrating installation of improvement, it can overcome in prior art cannot compare and calibrate by flow meter now, the some shortcomings of the equal existing defects of the accuracy of simultaneously calibrating, stability and the scope of application.
To achieve these goals, technical scheme of the present invention is: portable method of standard table flowmeter calibrating installation, it mainly comprises support body, it is characterized in that: the side of support body is provided with water supply installation, standard scale device and control module is provided with in support body, the standard mass flow meter group that 2-4 platform is arranged side by side is provided with in standard scale device, water supply installation, standard mass flow meter group is respectively equipped with water inlet end and water side, water supply installation water side is connected by the input end of pipeline with standard mass flow meter group, the output terminal of standard mass flow meter group and calibrated flowmeter, after flowrate control valve connects successively and water supply installation input end form a closed loop, control module is connected with a PC.
During use, it is of the present invention by calibrated flowmeter is connected with this device, by the precision-fit such as interface, accessory, form the flow circulation system, by the contrast signal that output signal and the system of each parts collection calibrated flowmeter in system provide, thus draw the error of calibrated flowmeter, then carry out scene and calibrate constantly, therefore the present invention has following features:
1, whole calibration process fast, accurate, precision is high;
2, the calibration to mass flowmeter and volumetric displacement meter is supported
3, only a people is needed, just can the whole calibration operation in complete field easily;
4, can, according to the off-line/on-line calibration needing enforcement flowmeter of on-the-spot test, be a kind of integrative solution;
5, the system integration measurement of temperature, pressure, comprises the temperature of measuring media, pressure, and the pressure of environment, meets the requirement of ISO17025;
6, system carries water supply module, convenient and reliable, unique;
7, applied widely, be equipped with various special process and connect, for the connection of calibrated flowmeter and calibrating installation, make measurement maintain enough straight lengths, meet the reducing of specification;
8, unique structure, ensures that it can dismounting easily and reliably, and with castor, is convenient to mobile, enough small and exquisite size, meets the requirement of transport, be therefore not only adapted at using in laboratory, equally also meet the demand of onsite application.
9, system supports the collection of multi-signal: with/without source 4-20mA (explosion-proof/non-explosion-proof), pulse/frequency (supporting high to 10KHz), Profibus bus.
10., through Nanjing metering institute, proficiency testing, device uncertainty is better than 0.15%.
Accompanying drawing explanation
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 is the structural representation of one embodiment of the invention standard scale device and control module.
Fig. 3 is the another structural representation of one embodiment of the invention standard scale device and control module.
Fig. 4 is the perspective view of one embodiment of the invention standard scale device and control module.
Fig. 5 is the U-tube structural representation of one embodiment of the invention.
Fig. 6 is the vertical view of Fig. 5.
Fig. 7 is the another U-tube structural representation of one embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Label in each accompanying drawing is expressed as follows:
1 equalizing valve;
2 clips;
21 shell rings; 22 locked clip device spanners; 23 fixing ears; 24 spanner portions;
3 second straight tubes;
4 anchor ears;
41 anchor ear bodies; 42 semicircle boss; 43 reinforcement frameworks; 44 connecting holes;
5 flexible pipes;
6 first straight tubes;
7 circular raised lines.
8 water supply installations;
9 standard scale devices; 91 standard mass flow meters;
10 control modules; 11 calibrated flowmeters; 12 flowrate control valves; 13 traffic alignment display systems; 14 show on trial; 15Y type bracket; 16 second thermometers; 17 pressure gauges; 18 first thermometers.
The present invention's portable method of standard table flowmeter calibrating installation, it mainly comprises support body, its difference with the prior art is: described support body has two, water supply installation is provided with in a support body, standard scale device and control module is provided with in another support body, the standard mass flow meter group that 2-4 platform is arranged side by side is provided with in standard scale device, water supply installation, standard mass flow meter group is respectively equipped with water inlet end and water side, water supply installation water side is connected by the input end of pipeline with standard mass flow meter group, the output terminal of standard mass flow meter group and calibrated flowmeter, after flowrate control valve connects successively and water supply installation input end form a closed loop, control module is connected with a PC.The support body upper surface being provided with standard scale device presents step-like, is divided into high step and low step, and a side angle place of low step is provided with Y type bracket, and for the flexible pipe of each equipment of support and connection, and the velocity of medium that maintenance enters in checkout equipment is relatively steady, orderly.
3 standard mass flow meters be arranged side by side are provided with in standard scale device, the angle of 45 degree is formed between three standard mass flow meters side by side and surface level, above-mentioned angle can be that velocity of medium is steady, make accuracy of detection, accuracy is strengthened, a pressure gauge and two thermometers are also provided with in standard scale device, first thermometer is arranged on support body, for the temperature of testing environment, second thermometer and pressure gauge are arranged on the pipeline between calibrated flowmeter and flowrate control valve, second thermometer is for detecting the temperature of medium, pressure gauge is used for the back pressure of detection system, ensure that testing pipes has enough back pressures, keep the stability of fluid, ensure the full packages detecting medium, flowrate control valve has three.One end of calibrated flowmeter is connected by flexible pipe with between the output terminal of standard mass flow meter group, be provided with between the output terminal of flexible pipe and standard mass flow meter group and show on trial, this setting of showing on trial is convenient to observe fluid state, and judging whether fluid meets alignment requirements with this, flexible pipe is connected by transfer tube and packing washer with calibrated flowmeter.
Be provided with three entablature footpaths in standard scale device and be respectively DN08, the standard mass flow meter of DN25 and DN50, each standard mass flow meter is respectively equipped with switch valve and output signal terminal, water-proofing treatment has all been carried out in the two ends of each standard mass flow meter, and output signal terminal is connected with control module.Calibrated flowmeter is provided with signal output part, and described signal output part is connected with control module.The bottom of support body is provided with pulley, is provided with the pump that water tank matches with water tank in described water supply installation frame.
During use, device performance parameters is as follows:
Maximum instantaneous flow:
When using water supply installation to supply water: 34t/h
When standard scale device is connected serially to on-the-spot loop: 180t/h
Maximum pressure: 4bar
Best uncertainty: 0.11% (mass rate or volumetric flow rate)
Described U-tube is by being located at first straight tube at middle part and point being located at second straight tube at the first straight tube two ends and flexible pipe is formed by connecting, the side of the first straight tube is provided with equalizing valve, manage and be softly provided with an anchor ear, first straight tube is connected respectively by a bend pipe with between the second straight tube, flexible pipe, and the junction of the second straight tube, flexible pipe and bend pipe is respectively equipped with a clip.The side of the first straight tube is provided with one and the vertically disposed connecting pipe of the first straight tube, and one end of connecting pipe is provided with equalizing valve, and equalizing valve is formed by connecting by valve body and the rotating spanner be located on valve body.The afterbody of the second straight tube and the afterbody of flexible pipe are provided with circular raised line outwardly.
Described anchor ear by two be oppositely arranged, anchor ear body fits that shape is identical forms, be provided with a semicircular cavity in the middle part of each anchor ear body, the circular cavity diameter formed after two anchor ear body fits matches with the diameter of flexible pipe, the side of each anchor ear body is provided with a semicircle boss outwardly, the top and the bottom of anchor ear body are respectively equipped with a reinforcement framework, reinforcement framework is goal shape, crucial effect is played to the bulk strength strengthening anchor ear in the shape of reinforcement and its position arranged, better holding tightly and firmly acting on can be played to flexible pipe simultaneously, a plate is provided with in described reinforcement framework, web joint is provided with two connecting holes, two connecting hole correspondences on two corresponding anchor ear bodies are arranged, when web member is through above-mentioned two connecting holes, just can play the effect of fixing anchor ear, also can tighten the cavity diameter of anchor ear further simultaneously, make to fit between anchor ear and flexible pipe more firm, closely.
Clip is formed by connecting by shell ring and locked clip device spanner, the two ends of shell ring are respectively equipped with a fixing ear, two described fixing ears are respectively equipped with a screw, and one end of locked clip device spanner is connected with the set nut being located at fixing ear side through after two screws.Locked clip device spanner is made up of with the bolted connection be located at below spanner portion the spanner portion of Eight characters shape, and the spanner portion of Eight characters shape is more convenient in use, rotates firmly more even, smoothly; Shell ring is circular, and one end of shell ring is openend, and two described fixing ears are symmetricly set in shell ring open end respectively.
During use, U-tube to be connected with flexible pipe by straight tube and to form, the side of the first straight tube is provided with equalizing valve, manage and be softly provided with an anchor ear, due to structures such as the reinforcements that singularity and the top thereof of hooping structure are arranged, the effect of anchor ear is strengthened, the enclasping pressure applied flexible pipe is more even effectively, namely ensure that the connection of flexible pipe is fastening, it is good that rear fitness installed by pipe fitting, flexible pipe pressurized generation deformation can not be made again, affect sealing and reuse, second straight tube simultaneously, the junction of flexible pipe and bend pipe is respectively equipped with a clip, the shape of clip makes this device dismounting convenient, clamping and unscrewing operation are conveniently simultaneously, highly versatile, can Reusability indeformable, non-warping, crucial stabilization is played in flow meter calibration.
The concrete using method of this device is described below by concrete example.
Embodiment 1
Equipment is connected and pipeline by process, by the flowmeter that is calibrated and equipment connection, by water tank and pump, and the control of valve, form the flow circulation system, then pass through the output signal of system acquisition calibrated flowmeter, pass through system software, obtain the calibration data of calibrated flowmeter, thus calculate the error of calibrated flowmeter.Equipment can provide the flow of 0-35t/h, can calibrate the flowmeter of DN08-DN80.Calibration result is as follows:
Calibrate a DN50 mass flowmeter
| Normal flow (kg/h) | Calibrated meter flow (kg/h) | The error of indication (%) |
| 0.00 | 0.00 | 0.00 |
| 10166.50 | 10129.70 | -0.12 |
| 19927.20 | 19912.40 | -0.05 |
| 29871.80 | 29838.20 | -0.11 |
Calibrate a DN32 electromagnetic flowmeter
| Normal flow (ml/s) | Calibrated meter flow (ml/s) | The error of indication (%) |
| 0.00 | 0.00 | 0.00 |
| 998.51 | 996.74 | -0.18 |
| 2009.08 | 2001.13 | -0.40 |
| | |
The turbo flow meter of a calibration DN25
| Normal flow (l/min) | Calibrated meter flow (l/min) | The error of indication (%) |
| 10.59 | 8.96 | -1.63 |
| 89.70 | 87.88 | -1.82 |
| 171.87 | 170.30 | -1.57 |
| 250.86 | 249.49 | -1.37 |
Embodiment 2
Conveniently carry out Site Detection, the support body of whole equipment standard meter apparatus and the bottom mobile device of water supply installation frame, all can be disassembled, so just convenient transport, when transporting, can be placed on separately in means of transport, the space greatly taken needed for saving equipment.The castor of device bottom, with brake, facilitates equipment in transit fixing, can not slide.
Equipment is connected and pipeline by process, the device of subsidiary standard scale is linked in the process pipeline of calibrated flowmeter, form the flow circulation system, again by the output signal of system acquisition calibrated flowmeter, pass through system software, obtain the calibration data of calibrated flowmeter, thus calculate the error of calibrated flowmeter.Equipment can measure the flow of 180t/h, can calibrate the flowmeter of DN08-DN150.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that the present invention specifically implements to be confined to these explanations above-mentioned.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.