CN205262556U - Gas flow detection device - Google Patents
Gas flow detection device Download PDFInfo
- Publication number
- CN205262556U CN205262556U CN201521111855.8U CN201521111855U CN205262556U CN 205262556 U CN205262556 U CN 205262556U CN 201521111855 U CN201521111855 U CN 201521111855U CN 205262556 U CN205262556 U CN 205262556U
- Authority
- CN
- China
- Prior art keywords
- gas
- caisson
- checked
- calibrating
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model provides a gas flow detection device relates to gas flowmeter technical field for solve among the prior art and to carry out the process security problem poor, with high costs of examining and determine to gas flowmeter. Gas flow detection device includes the normal flow generator, gas storage device, it links to each other with the normal flow generator through the examination pipeline for store test gas, the setting remains to be examined the table and inserts the mouth in the examination pipeline, is used for will waiting to examine when the examination showing to insert in the examination pipeline, drive arrangement, it links to each other with gas storage device, the diverter valve, it links to each other with gas storage device through the sharing pipeline, and the diverter valve passes through return line and links to each other with the normal flow generator, and the diverter valve still links to each other with exhaust pipe. Gas flow detection device is used for examining and determine gas flowmeter's metering performance.
Description
Technical field
The utility model relates to gas flowmeter technical field, relates in particular to a kind of gas flow calibrating installation.
Background technology
Gas flowmeter is that one is arranged in pipeline, for the instrument of gas flow in metering pipeline, at gas flowBefore meter dispatches from the factory or uses, must examine and determine its metering performance, to ensure to use gas flowmeter metering gas flowThe degree of accuracy.
In the time that gas flowmeter is examined and determine, normally used a kind of mode is, by standard flow quantity generators and to be checkedTable (gas flowmeter to be examined and determine) is serially connected in pipeline, in pipeline, passes into test gas, passes through standard flow quantity generatorsThe test gas of normal flow is provided, and the test gas of this normal flow has certain temperature and pressure condition, and it is flowed through and treatsWhen inspection table, the flow of this test gas of table sensing to be checked, produces measurement result, afterwards, inner to this measurement result at table to be checkedCarry out temperature and pressure compensation, make the temperature and pressure condition of measurement result and the temperature and pressure bar of normal flow after compensationPart is identical, claims that the measurement result after compensation is measured discharge, by the normal flow of measured discharge and standard flow quantity generators outputCompare, obtain the error of table to be checked. Wherein, test gas adopts air conventionally, in verification process, is directly emitted.
But due in the actual use procedure of gas flowmeter, what it measured is that the mixing such as combustion gas are flammable mostlyProperty gas, therefore adopt mix imflammable gas as test gas, gas flowmeter is examined and determine, more can ensure gas flowDegree of accuracy when amount meter uses. Mix imflammable gas as test gas but adopt, gas flow inspection of the prior artDetermine device needs mixing imflammable gas to be directly disposed in external environment in verification process, this danger that very easily sets off an explosionDanger, causes the security of verification process poor, and causes the wasting of resources, increases the cost of calibrating.
Utility model content
For overcoming above-mentioned defect of the prior art, the utility model proposes a kind of gas flow calibrating installation, Neng GoushiExisting test gas sealing and circulating in gas flow calibrating installation, in improving verification process security, has reduced calibratingCost.
For achieving the above object, the utility model adopts following technical scheme:
The utility model provides a kind of gas flow calibrating installation, comprises standard flow quantity generators, described gas flowCalibrating installation also comprises caisson, drive unit and transfer valve; Wherein, described caisson is by calibrating pipeline and normal streamAmount generator is connected, and for storing test gas, is provided with table access port to be checked in described calibrating pipeline, for inciting somebody to action in the time examining and determineTable to be checked accesses in described calibrating pipeline; Described drive unit is connected with described caisson, is used to described caisson to carryFor power, the volume of described caisson is diminished; Described transfer valve is connected with described caisson by common pall, described inTransfer valve is connected with standard flow quantity generators by return line, and described transfer valve is also connected with gas exhaust piping, described switchingValve is used for connecting common pall and return line, occurs so that the test gas storing in described caisson is filled with normal flowIn device, or connect common pall and gas exhaust piping, so that the gas in described caisson and each pipeline is discharged.
Gas flow calibrating installation provided by the utility model is set up on the basis of existing gas flow calibrating installationCaisson, drive unit and transfer valve. When calibrating, first table to be checked is connected on and is arranged at standard flow quantity generators and gas storage dressOn table access port to be checked between putting, and make table to be checked and calibrating pipeline connection, utilize transfer valve by common pall and blast pipeRoad is communicated with, and passes into test gas, makes caisson and each pipeline be full of test gas; Then utilize transfer valve by common pall withReturn line is communicated with, and utilizes drive unit to drive caisson, the volume of caisson is diminished, the test gas of its storage insideBody is filled with in standard flow quantity generators; Utilize afterwards standard flow quantity generators that the test gas of normal flow is provided, testing gasWhen body is flowed through table to be checked, obtain the measured discharge of table to be checked, measured discharge and normal flow are compared, obtain between the twoError information. Test gas is flowed through after table to be checked and can be stored in caisson, pending while examining and determine next time, only needs againUse drive unit to make the test gas of storing in caisson be filled with in standard flow quantity generators and can examine and determine. VisibleIn verification process, whole gas flow calibrating installation is in air-tight state, while having avoided mixing imflammable gas as test gasThe problem of easily blasting that directly discharge causes, the security that has improved verification process; And test gas is in standardBetween flow generator and caisson, recycle, while having avoided mixing imflammable gas as test gas, directly discharge instituteThe problem of the wasting of resources causing, has reduced the cost of examining and determine.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below will be to embodimentOr the accompanying drawing of required use is briefly described in description of the Prior Art, apparently, the accompanying drawing in the following describes onlyEmbodiment more of the present utility model, for those of ordinary skill in the art, in the prerequisite of not paying creative workUnder, can also obtain according to these accompanying drawings other accompanying drawing.
The basic block diagram of the gas flow calibrating installation that Fig. 1 provides for the utility model embodiment;
The concrete structure figure of the gas flow calibrating installation that Fig. 2 provides for the utility model embodiment.
Description of reference numerals:
1-source of the gas; 2-standard flow quantity generators;
3-table to be checked; 4-caisson;
5-transfer valve; 6-negative pressure device;
7-air inlet pipeline; 8-examines and determine pipeline;
9-common pall; 10-return line;
11-gas exhaust piping; 12-pressure-reducing valve;
13-air inlet switch; 14-flow control valve;
15-examines and determine switch; 16-thermostatic chamber;
17-heat exchanger; 18,20,22-temperature sensor;
19,21,23-pressure sensor; 24-drive unit;
24a-action bars; 24b-air motor;
25-stable-pressure device; 25a-the first pulley;
25b-the second pulley; 25c-connection cord;
25d-balancing weight.
Detailed description of the invention
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with this practicalityAccompanying drawing in new embodiment, is clearly and completely described the technical scheme in the utility model embodiment. Obviously, instituteThe embodiment describing is only the utility model part embodiment, instead of whole embodiment. In the utility modelEmbodiment, all other enforcements that those of ordinary skill in the art obtain under the prerequisite of not making creative workExample, all belongs to the scope that the utility model is protected.
Embodiment of the present utility model provides a kind of gas flow calibrating installation, as shown in Figure 1, and this gas flow calibratingDevice comprises connected successively standard flow quantity generators 2, caisson 4, drive unit 24 and transfer valve 5, in addition, and normal flowGenerator 2 is also connected with source of the gas 1, and transfer valve 5 is also connected with standard flow quantity generators 2, and transfer valve 5 also with gas exhaust piping 11 phasesConnect.
Between above-mentioned each parts, all connect by pipeline, wherein for connecting the pipeline of source of the gas 1 and standard flow quantity generators 2For air inlet pipeline 7, be calibrating pipeline 8 for connection standard flow generator 2 with the pipeline of caisson 4, for connecting gas storageDevice 4 is common pall 9 with the pipeline of transfer valve 5, is backflow for connecting transfer valve 5 with the pipeline of standard flow quantity generators 2Pipeline 10. Wherein, on calibrating pipeline 8, be provided with table access port to be checked, in the time of calibrating, table 3 to be checked be connected on to this table access to be checkedOn mouth, table 3 to be checked is accessed in calibrating pipeline 8, make table 3 to be checked between standard flow quantity generators 2 and caisson 4.
In above-mentioned each parts, source of the gas 1 for being filled with needed survey to gas flow calibrating installation in the time examining and determine firstGas testing body, or be filled with needed purge gas etc. to detergent line when cleaning.
Standard flow quantity generators 2, in having under the environment of uniform temperature and pressure, has mark for the gas that makes to flow throughAccurate flow, that is to say, normal flow has uniform temperature and pressure condition, and normal flow is the error for obtaining table to be checkedStandard flow, normal flow can be multiple different gas flows points, establishes according to the difference of the flow point that will examine and determineFixed.
Caisson 4 is for storing test gas.
Drive unit 24 is connected with caisson 4, is used to caisson 4 that power is provided, so that the volume of caisson 4Diminish, and then gas in caisson 4 discharged, in pipeline-cleaning or displacement stage, in caisson 4 for scavenge pipeThe gas on road passes through outside gas exhaust piping 11 Exhaust Gas flow calibrating devices, in the calibrating stage, and the test gas in caisson 4Be filled with in standard flow quantity generators 2 by return line 10.
Transfer valve 5 is arranged at the Nodes that common pall 9, return line 10 and gas exhaust piping 11 threes cross, on the one handFor in the time that needs are examined and determine table to be checked, by the switching action in valve, connect common pall 9 and return line 10, fromAnd caisson 4 is communicated with standard flow quantity generators 2, interior the stored test gas of caisson 4 can be through common pall 9With return line 10, be back in standard flow quantity generators 2, so that standard flow quantity generators 2 provides being filled with after test gasThe mark condition flow of specifying; On the other hand, transfer valve 5 is in the time that needs carry out purge of gas to caisson 4 and each pipeline,By the switching action in valve, connect common pall 9 and gas exhaust piping 11, thereby make the gas in caisson 4 and each pipelineCan discharge.
While adopting above-mentioned gas flow calibrating device to examine and determine table to be checked, first table 3 to be checked is connected on and is arranged at inspectionOn table access port to be checked in fixed tube road 8, make it between standard flow quantity generators 2 and caisson 4. Storage when initialGas in device of air 4 and each pipeline is air, for avoiding air to mix in test gas, causes under the degree of accuracy of verification resultFall, therefore need caisson 4 and each pipeline to carry out purge of gas and displacement, make test gas displaced air, caisson 4And in each pipeline, only there is test gas, and this step is: switches transfer valve 5, common pall 9 and gas exhaust piping 11 connected,By the Bas Discharged in caisson 4 and each pipeline; In standard flow quantity generators 2, be filled with test gas, make test gas completeEntirely by air displacement. Then switch transfer valve 5, common pall 9 and return line 10 are connected, utilize drive unit 24 to drive storageDevice of air 4, is filled with in standard flow quantity generators 2 test gas of caisson 4 interior storages. Utilize afterwards normal flow to occurDevice 2 provides normal flow, obtains the measured discharge of table 3 to be checked, by the normal stream of measured discharge and standard flow quantity generators outputAmount is compared, and obtains the error of the two. After the calibrating of this flow point completes, test gas is got back to again in caisson 4,In the time need to carrying out the calibrating of next flow point, again utilize drive unit 24 to drive caisson 4, its volume is diminished, fromAnd its inner test gas is filled with in standard flow quantity generators 2 again, can examine and determine.
Be not difficult to find by above-mentioned gas flow calibrating device and verification process thereof, adopt above-mentioned gas flow calibrating device pairIn the whole process that table to be checked is examined and determine, test gas all the time under closed environment, thereby avoided adopting mix flammableWhen property gas does test gas, test gas is directly discharged, the problem that the test gas bringing is easily blasted, has improvedThe security of verification process. And in the verification process of different flow point, test gas is in standard flow quantity generators 2 and gas storageBetween device 4, be recycled reciprocal utilization, while having avoided adopting mixing imflammable gas to do test gas, test gas directly arrangedPut, the problem of the wasting of resources bringing, has reduced the cost of examining and determine.
It should be noted that, the temperature and pressure condition of the normal flow that standard flow quantity generators 2 provides can be mark conditionThe temperature and pressure of environment, according to actual calibrating needs, the temperature and pressure condition of normal flow can be also work condition environmentTemperature and pressure. Wherein, so-called " mark condition environment " refers to that temperature is 20 DEG C, and pressure is the environment of 1 standard atmospheric pressure, so-called workEnvironment when condition environment refers to real work. No matter the temperature and pressure condition of normal flow is temperature and the pressure of mark condition environmentPower, or the temperature and pressure of work condition environment, in the time that table to be checked is examined and determine, when table to be checked records after a flow value, all wantThis flow value is carried out to the compensation of temperature and pressure, so that the temperature and pressure condition of the flow value after compensation and normal flowTemperature and pressure condition is identical.
In the present embodiment, the caisson 4 therein maximum volume under the constant state of gas pressure is preferably greater thanOr equal the maximum volume of standard flow quantity generators 2, even if standard flow quantity generators 2 provides maximum normal flow like this, surveyingAfter gas testing body is all filled with in caisson 4, it is constant that the gas pressure in caisson 4 still can keep, and avoided gas storageThe normal flow that installing 4 air inlet place pressure oscillations provides standard flow quantity generators 2 impacts, and has ensured the standard of calibratingExactness. It is pointed out that for the temperature and pressure condition of normal flow to be the feelings of the temperature and pressure condition of mark condition environmentCondition, preferably will ensure that the constant pressure of caisson 4 air inlets approaches 1 standard atmospheric pressure.
Referring to Fig. 1 and Fig. 2, in the gas flow calibrating installation providing at the present embodiment, caisson 4 is rigidity knotStructure, preferred caisson 4 can comprise sealed liquid cell 4a and storage cover 4b, wherein, in sealed liquid cell 4a, sealing fluid is housed; Gas storageCover 4b is tubular structure, its bottom opening, and top seal, lower submerged is in sealing fluid, and top is in sealing fluid top, alsoBe the relative position relation of saying sealed liquid cell 4a and storage cover 4b to be that storage cover 4b is opening down be buckled in sealed liquid cell 4a, andA part of storage cover 4b is immersed in sealing fluid. Due to the gap between the sidewall of sealed liquid cell 4a and the sidewall of storage cover 4bSealed liquid sealing, therefore forms enclosure space between storage cover 4b and sealing fluid liquid level, will examine and determine pipeline 8 and common pall 9Be communicated with this enclosure space respectively, make this enclosure space can be used in storage test gas, realized test gas at gasSealing and circulating in flow calibrating device. It should be noted that, in order to realize calibrating pipeline 8 and common pall 9 respectively with describedEnclosure space is communicated with, and calibrating pipeline 8 need to be passed in described enclosure space near one end of caisson 4, by common pall 9One end near caisson 4 upwards passes in described enclosure space, and in order to ensure that sealing fluid can not flow in pipeline, excellentWill the making of choosing examined and determine port and the common pall 9 that pipeline 8 passes in described enclosure space and passed into the port in described enclosure spaceAll higher than sealing fluid liquid level.
In above-mentioned caisson 4, the gap between the sidewall of sealed liquid cell 4a and the sidewall of storage cover 4b can be greater than orEqual 3cm, be less than or equal to 5cm, to ensure on the basis of good sealing, make the storage cover 4b can be at sealed liquid cell 4aInside freely move up and down. Sealing fluid is preferably oil, to ensure that caisson 4 has good sealing. In sealed liquid cell 4aThe length of the height of sealing fluid liquid level and storage cover 4b can be according to the maximum volume of caisson 4 actual needs (this maximum volumeCan be caisson 4 maximum volume under the constant state of gas pressure therein) set.
If it is pointed out that caisson 4 adopts the structure of syringe-like, the inflator of caisson 4 and pistonBetween realize sealing by rigidity or flexible parts, between the inflator of caisson 4 and piston, inevitably can occurFriction, frictional heat, thus can cause the test gas temperature in caisson 4 to raise, finally cause under the degree of accuracy of calibratingFall. In the caisson 4 of the said structure that the present embodiment provides, at storage cover, 4b moves up and down, and makes sealed liquid cell 4a and storageIn the process that the volume of the enclosure space that gas hood 4b forms changes, the sidewall of the sidewall of sealed liquid cell 4a and storage cover 4bBetween gap sealed liquid sealing all the time, thereby realized the movable sealing between sealed liquid cell 4a and storage cover 4b, sealing fluidExistence due to sealing fluid between the sidewall of the sidewall of groove 4a and storage cover 4b can not rub, and has therefore also just avoided employingRigidity or elastomeric element are realized the caused frictional heat problem of sealing, have ensured the degree of accuracy of calibrating.
In the gas flow calibrating installation that the present embodiment provides, standard flow quantity generators 2 preferably can adopt bell-jarStandard flow quantity generators, thinks that verification process provides normal flow.
For bell-jar standard flow quantity generators, if by drive unit being set, profit in standard flow quantity generators 2 one sidesLift the bell jar of standard flow quantity generators 2 with this drive unit, the test gas that caisson 4 is stored is back to normal flowIn generator 2, may be excessive or unstable due to driving force, cause the liquid levels in standard flow quantity generators 2 to rise, veryTo flowing in pipeline, cause calibrating to carry out. In the present embodiment, by caisson 4 one sides, drive unit 24 being set, driveMoving device 24 is by pressing the storage cover 4b of caisson 24 downwards, and the test gas that drive unit 24 is stored is filled with normal streamIn amount generator, therefore the sealing fluid liquid level in the sealed liquid cell 4a of caisson 24 only may decline, and has avoided in standardFlow generator 2 one sides arrange the caused liquid of drive unit and flow into the problem in pipeline, thereby have ensured the smooth of calibratingCarry out.
Referring to Fig. 1 and Fig. 2, based on the above-mentioned caisson 4 that comprises sealed liquid cell 4a and storage cover 4b, the present embodiment is carriedThe drive unit 24 of the gas flow calibrating installation of confession preferably can comprise action bars 24a and air motor 24b, wherein, and operationBar 24a is arranged at the top of storage cover 4b, and preferred action bars 24a is vertically installed on the top of storage cover 4b, air motor 24b24a is connected with action bars. In the time the gas in the enclosure space of storage cover 4b and sealing fluid formation need to being discharged, utilize pneumaticMotor is action bars 24a, and the power moving downward is provided, thereby drives storage cover 4b to move downward, and makes storage cover 4b and sealingThe volume of the enclosure space that liquid forms reduces, Exhaust Gas.
It should be noted that, while inflation in the enclosure space to storage cover 4b and sealing fluid formation, gas in enclosure spaceThe expansion of body volume and the buoyancy of sealing fluid can make storage cover 4b move upward, therefore without utilizing air motor 24b for operationBar 24a provides power upwards.
Referring to Fig. 1 and Fig. 2, based on the above-mentioned caisson 4 that comprises sealed liquid cell 4a and storage cover 4b, the present embodiment is carriedThe gas flow calibrating installation of confession also can comprise stable-pressure device 25, and stable-pressure device 25 can be by the side of the counterweight of adjustment storage cover 4bFormula, realizes the adjustment to the gas pressure in the enclosure space of storage cover 4b and sealing fluid formation. Preferably, this stable-pressure device 25Can comprise the first pulley 25a, the second pulley 25b, connection cord 25c and balancing weight 25d, wherein, the first pulley 25a is arranged at gas storageThe top of cover 4b; The second pulley 25b is arranged at a side of the first pulley 25a, preferably can be arranged at same with the first pulley 25aOn horizontal level; Connection cord 25c is upper around the first pulley 25a and the second pulley 25b, and the lifting gas storage of one end of connection cord 25cCover 4b, other end lifting balancing weight 25d, connection cord 25c is preferably steel wire. Utilize like this first pulley 25a, the second pulley 25bReach with connection cord 25c the object that changes the direction of power, by adjusting the quality of balancing weight 25d, can realize storage coverThe adjustment of the gas pressure in the enclosure space that 4b and sealing fluid form, makes gas pressure in enclosure space in verification processRemain constant, the shadow of having avoided the interior gas pressure of caisson 4 to fluctuate to standard flow quantity generators 2 outputting standard flowsRing, ensured the degree of accuracy of calibrating.
Transfer valve 5 preferably can adopt tee ball valve, with by the handover operation to tee ball valve, realize specify pipeline itBetween connection.
As shown in Figure 1 or 2, in order to realize the discharge of gas in caisson 4 and each pipeline, preferably can be at blast pipeRoad 11 arranges negative pressure device 6 away from one end of transfer valve 5, and this negative pressure device 6 preferably can adopt peristaltic pump. This negative pressure device 6For produce negative pressure in one end of gas exhaust piping 11, extract the gas in caisson 4 and each pipeline out, to caisson 4 andIn each pipeline, being filled with in the situation of test gas, is test gas by the gas displacement in caisson 4 and each pipeline.
In the present embodiment, can be by set up the skill of some valves, sensor member in gas flow calibrating installationArt means, further improve and optimize the function of gas flow calibrating installation. Concrete, as shown in Figure 2, can enterPressure-reducing valve 12 is set in air pipe 7, so that the pressure of the gas that subtend air inlet pipeline 7 is filled with regulates, source of the gas 1 is carriedThe gas of confession can be filled with in gas flow calibrating device smoothly; Comparatively preferably, in order to enter air inlet pipeline 7 at source of the gas 1Time adjust in time the pressure of gas, pressure-reducing valve 12 can be arranged on to the position near source of the gas 1.
Air inlet switch 13 can be set in air inlet pipeline 7, and this air inlet switch 13 preferably can adopt straight-through valve, so thatConnect or cut-off air inlet pipeline 7, to gas, whether Engage of standard flow generator 2 is controlled. Comparatively preferably, in order to haveEffect is blocked the air-flow being filled with in standard flow quantity generators 2, air inlet switch 13 can be arranged on to the position near standard flow quantity generators 2Put.
Can in calibrating pipeline 8, flow control valve 14 be set, this flow control valve 14 is arranged at table access port to be checked and storageBetween device of air 4, thereby this flow control valve 14 is between table 3 to be checked and caisson 4 in the time of calibrating, so that regulate inspectionThe flow of test gas in fixed tube road 8, obtains table to be checked and normal flow under different flow point the error ratio between 2 devices occursTo data.
Can calibrating switch 15 be set in calibrating pipeline 8, this calibrating switch 15 preferably can adopt straight-through valve, this calibratingSwitch 15 is arranged between table access port to be checked and caisson 4, thus when calibrating this calibrating switch 15 be positioned at table 3 to be checked withBetween caisson 4, so that connect in verification process or cut-off calibrating pipeline 8. It is pointed out that for better controlMake the air-flow in whole calibrating pipeline 8, preferably calibrating switch 15 can be arranged to more close storage with respect to flow control valve 14The position of device of air 4.
Thermostatic chamber 16 can be set, and table access port to be checked is arranged in this thermostatic chamber 16, thereby at when calibrating table 3 to be checkedBe positioned at this thermostatic chamber 16, thermostatic chamber 16 can adopt insulation material to make, so that make the working temperature of table to be checked in specifyingIn environment, the accuracy of detection to table to be checked under the working temperature of specifying is examined and determine. It should be noted that, what is called be " appointmentWorking temperature environment " refer to pre-set a certain working temperature. In order to obtain table to be checked under different working temperature environmentMeasured discharge (this measured discharge is through temperature and pressure compensation, temperature and the pressure of its temperature and pressure condition and normal flowPower condition is identical) and the normal flow that provides of standard flow quantity generators 2 between error ratio to data, exist to examine and determine table to be checkedAccuracy of detection under different working temperatures, the working temperature that thermostatic chamber 16 provides preferably can change.
Based on the above-mentioned technical scheme about thermostatic chamber 16, can further in calibrating pipeline 8, heat exchanger 17 be set, this changesHot device 17 is arranged in thermostatic chamber 16, and this heat exchanger 17 is arranged between standard flow quantity generators 2 and table access port to be checked,Thereby this heat exchanger 17 is between standard flow quantity generators 2 and table 3 to be checked, to enter thermostatic chamber at test gas in the time of calibratingAfter 16, before the table to be checked of flowing through, by carrying out heat exchange effect with test gas, make in the temperature of test gas and thermostatic chamber 16Temperature is consistent, even if the temperature of test gas reached the working temperature of appointment before the table to be checked of flowing through, improves the accurate of calibratingDegree.
It should be noted that, because standard flow quantity generators 2 is positioned at the outside of thermostatic chamber, therefore in regulating constant greenhouse 2Temperature when changing the working temperature of the residing work condition environment temperature of table to be checked and test gas, can ensure that normal flow occursThe residing temperature environment of device 2 can not be affected, thereby ensures the accuracy of calibrating data.
Can calibrating pipeline 8 in set temperature sensor 18, and by this temperature sensor 18 be arranged at normal flow occurBetween device 2 and table access port to be checked, in the time of calibrating, this temperature sensor 18 is arranged at standard flow quantity generators 2 and table 3 to be checkedBetween, and this temperature sensor 18 is close to standard flow quantity generators 2 arranges, so that detect from standard flow quantity generators 2The temperature of the test gas flowing out, the normal flow that the temperature data obtaining according to detection provides standard flow quantity generators 2 entersTrip temperature compensation, the temperature conditions that provided normal flow is provided is the temperature conditions of specifying, and ensures the accuracy of calibrating.
Can in calibrating pipeline 8, pressure sensor 19 be set, and this pressure sensor 19 is arranged to normal flow generationBetween device 2 and table access port to be checked, in the time of calibrating, this pressure sensor 19 is arranged at standard flow quantity generators 2 and table 3 to be checkedBetween, and this pressure sensor 19 is close to standard flow quantity generators 2 and arranges, and flows from standard flow quantity generators 2 so that detectThe pressure of the test gas going out, the normal flow that the pressure data obtaining according to detection provides standard flow quantity generators 2 carries outPressure compensation, the pressure condition that provided normal flow is provided is the pressure condition of specifying, and ensures the accuracy of calibrating.
Can calibrating pipeline 8 in set temperature sensor 20, and by this temperature sensor 20 be arranged at normal flow occurBetween device 2 and table access port to be checked, and be close to table access port to be checked setting, in the time of calibrating, this temperature sensor 20 is arranged atBetween standard flow quantity generators 2 and table 3 to be checked, and be close to table 3 to be checked and arrange, so that detect the test gas table to be checked of flowing throughFront temperature, the temperature data obtaining according to detection carries out temperature-compensating to the measurement result of table to be checked, makes the actual measurement of table to be checkedThe temperature conditions of flow is identical with the temperature conditions of standard flow quantity generators 2, ensures the accuracy of calibrating.
Can in calibrating pipeline 8, pressure sensor 21 be set, and this pressure sensor 21 is arranged to normal flow generationBetween device 2 and table access port to be checked, and be close to table access port to be checked setting, in the time of calibrating, this pressure sensor 21 is arranged atBetween standard flow quantity generators 2 and table 3 to be checked, and be close to table 3 to be checked and arrange, so that detect the test gas table to be checked of flowing throughFront pressure, the pressure data obtaining according to detection carries out pressure compensation to the measurement result of table to be checked, makes the actual measurement of table to be checkedThe pressure condition of flow is identical with the pressure condition of standard flow quantity generators 2, ensures the accuracy of calibrating.
Can be in calibrating pipeline 8 set temperature sensor 22, and this temperature sensor 22 is arranged to table access port to be checkedAnd between caisson 4, and be close to table access port to be checked setting, in the time of calibrating, this temperature sensor 22 is arranged at table to be checked3 and caisson 4 between, and be close to table 3 to be checked and arrange, so that detect the temperature that test gas is flowed through after table to be checked, rootThe temperature data obtaining according to detection carries out temperature-compensating to the measurement result of table to be checked, makes the temperature strip of the measured discharge of table to be checkedPart is identical with the temperature conditions of standard flow quantity generators 2, ensures the accuracy of calibrating.
Can in calibrating pipeline 8, pressure sensor 23 be set, and this pressure sensor 23 is arranged to table access port to be checkedAnd between caisson 4, and be close to table access port to be checked setting, in the time of calibrating, this pressure sensor 23 is arranged at table to be checked3 and caisson 4 between, and be close to table 3 to be checked and arrange, so that detect the pressure that test gas is flowed through after table to be checked, rootThe pressure data obtaining according to detection carries out pressure compensation to the measurement result of table to be checked, makes the pressure strip of the measured discharge of table to be checkedPart is identical with the pressure condition of standard flow quantity generators 2, ensures the accuracy of calibrating.
Taking gas flow calibrating installation illustrated in fig. 2 as example, the gas flow that the present embodiment is provided is examined and determine belowThe verification process of device is described in detail.
Step S1: pipeline-cleaning. Can be by the air in caisson 4 and each pipeline with being used for scavenge pipe by this stepThe gas displacement on road is clean, can select and under normal temperature and pressure, be difficult for the gas that reacts, as nitrogen for the gas of detergent lineGas or inert gas, below describe as the gas for detergent line as example taking nitrogen. Step S1 specifically can comprise withLower step:
Step S11: open air inlet switch 13 and calibrating switch 15, regulate transfer valve 5, make common pall 9 and gas exhaust piping11 connect, and start negative pressure device 6, start air motor 24b, apply downward power by action bars 24a to storage cover 4b, makeThe volume of the enclosure space that storage cover 4b and Seal Oil liquid level form reduces, by the Bas Discharged in caisson 4 and each pipeline,In the time of the top of storage cover 4b contact Seal Oil liquid level, the volume of enclosure space is kept to zero, the sky in caisson 4 and each pipelineGas is discharged completely.
Step S12: close air motor 24b, close negative pressure device 6, regulate transfer valve 5, make common pall 9 and return ductRoad 10 is connected, and slowly regulates pressure-reducing valve 12, and pressure-reducing valve 12 outlet pressures are slowly adjusted to and gas can be filled with to caisson 4Pressure, preferably can be adjusted to 2000Pa by pressure, continues to be filled with nitrogen in caisson 4, to caisson 4 and each pipelineClean.
Step S13: after caisson 4 is full of, close pressure-reducing valve 12, stop inflation, regulate transfer valve 5, make to share pipeRoad 9 is connected with gas exhaust piping 11, starts negative pressure device 6, starts air motor 24b, applies to storage cover 4b by action bars 24aDownward power, reduces the volume of the enclosure space of storage cover 4b and the formation of Seal Oil liquid level, by caisson 4 and each pipelineIn nitrogen discharge, in the time of the top contact Seal Oil liquid level of storage cover 4b, the volume of enclosure space is kept to zero, caisson 4And nitrogen in each pipeline is discharged completely.
If strengthen cleaning performance, further remove the air in caisson 4 and each pipeline, improve caisson 4 andThe purity of nitrogen in each pipeline, can repeating step S12～S13.
It should be noted that, " caisson 4 is full of " described in the present embodiment refers to the gas holding at caisson 4Body volume reaches the maximum volume under the state that internal gas pressure is constant
Step S2: gas displacement. In this step, with test gas, the nitrogen in caisson 4 and each pipeline is purgedDisplacement, ensures that the gas in caisson 4 and each pipeline is pure test gas.
Step S21: close air motor 24b, close negative pressure device 6, regulate transfer valve 5, make common pall 9 and return ductRoad 10 is connected, and pressure-reducing valve 12 outlet pressures is slowly adjusted to the pressure that gas can be filled with to caisson 4, preferably can be by pressurePower is adjusted to 2000Pa, continues to be filled with test gas in caisson 4, to the gas displacement in caisson 4 and each pipelineFor test gas.
Step S22: be full of after test gas until caisson 4, close pressure-reducing valve 12, stop inflation, regulate transfer valve 5,Common pall 9 and gas exhaust piping 11 are connected, and starting negative pressure device 6, starts air motor 24b, by action bars 24a to gas storageCover 4b applies downward power, the volume of the enclosure space of storage cover 4b and the formation of Seal Oil liquid level is reduced, by caisson 4And test gas in each pipeline discharges, in the time of the top of storage cover 4b contact Seal Oil liquid level, the volume of enclosure space is kept toZero, the test gas in caisson 4 and each pipeline is discharged completely.
If strengthen replacement result, further remove the nitrogen in caisson 4 and each pipeline, improve caisson 4 andThe purity of test gas in each pipeline, can repeating step S21～S22.
Although it is pointed out that and have test gas to discharge in step S22, compared to existing technology at verification processIn continue the amount of test gas of discharging, the amount of the test gas that step S22 discharges is little, and for same test gasThe calibrating of body, multiple flow points only need be carried out a gas displacement before examining and determine first, can be in the inspection of carrying out multiple flow pointsThe test gas that timing cycle utilization is filled with, therefore for the whole verification process of multiple flow points, step S22 instituteThe amount of the test gas of discharging is considerably less, and the security on calibrating and the impact of cost are very little.
Step S23: close air motor 24b, close negative pressure device 6, regulate transfer valve 5, make common pall 9 and return ductRoad 10 is connected, and pressure-reducing valve 12 outlet pressures is slowly adjusted to the pressure that gas can be filled with to caisson 4, preferably can be by pressurePower is adjusted to 2000Pa, continues to be filled with test gas in caisson 4, treats the test gas that holds in caisson 4Volume reaches after the maximum volume of standard flow quantity generators 2, certainly also caisson 4 can be full of, and closes pressure-reducing valve 12, and closesClose air inlet switch 13.
Step S3: Flow-rate adjustment. In this step, by the instantaneous mark condition Flow-rate adjustment of standard flow quantity generators 2 to targetFlow point, obtains calibrating data.
Step S31: start air motor 24b, apply downward power by action bars 24a to storage cover 4b, make gas storageThe volume of the enclosure space that cover 4b and Seal Oil liquid level form reduces, and the test gas of storage in caisson 4 is filled with to standardIn flow generator 2, after the volume of standard flow quantity generators 2 build-in test gases reaches needed calibrating volume, hold one's breath in passMoving motor 24b, adjust flux control valve 14, reaches target flow point in the instantaneous normal flow output of standard flow quantity generators 2After, stop adjust flux control valve 14, and close calibrating switch 15.
It should be noted that, the volume that is filled with the test gas in standard flow quantity generators 2 can be according to the order that will examine and determineMark flow point and determine.
Step S32: reopen calibrating switch 15, make the test gas table to be checked of flowing through, table to be checked records a measured dischargeValue, this measured discharge value is through the compensation of temperature and pressure, the mark that its temperature and pressure condition and standard flow quantity generators 2 provideThe temperature and pressure condition of accurate flow is identical, under the target flow point of adjusting, to the measured measured discharge of table to be checked withThe normal flow that standard flow quantity generators 2 is exported is compared, and obtains error ratio under this target flow point to data, by this mistakePoor comparison data, as calibrating data, are closed calibrating switch 15, and are recorded described calibrating data.
In order to improve the degree of accuracy of verification result, can repeating step S31～S32, carry out the calibrating of several flow points, note moreThe lower calibrating data of obtaining of record different target flow point.
The gas flow calibrating installation going out as shown in Figure 2 and verification process thereof are not difficult to find, adopt this gas flow calibratingThe whole procedural test gas that device is examined and determine table to be checked all, under closed environment, therefore can not exist test gas straightConnect the caused blast problem of outside discharge, the security that has improved verification process; And, for using same test gasAnd the calibrating of carrying out under multiple flow points, this gas flow calibrating installation has not been realized recycling of test gas, therefore notCan exist test gas directly outwards to discharge the problem of the caused wasting of resources, reduce the cost of examining and determine. Meanwhile, by establishingPut drive unit 24 and drive caisson 4, its volume is diminished, make the test gas of its internal reservoir be filled with normal flow generationIn device 2, avoid the problem of the caused temperature rise of parts generation friction in test gas and gas flow calibrating installation,Ensure the degree of accuracy of calibrating. In addition, realize the movable sealing of caisson 25 by sealing fluid, make the parts in caisson 25Between there is not the problem of frictional heat, ensured the degree of accuracy of calibrating.
The foregoing is only detailed description of the invention of the present utility model, but protection domain of the present utility model is not limited toThis, any be familiar with those skilled in the art the utility model disclose technical scope in, the variation that can expect easilyOr replace, within all should being encompassed in protection domain of the present utility model. Therefore, protection domain of the present utility model should be with described powerThe protection domain that profit requires is as the criterion.
Claims (13)
1. a gas flow calibrating installation, comprises standard flow quantity generators, it is characterized in that, described gas flow calibrating installationAlso comprise caisson, drive unit and transfer valve; Wherein,
Described caisson is connected with standard flow quantity generators by calibrating pipeline, for storing test gas, and described detective tubeIn road, be provided with table access port to be checked, for table to be checked being accessed to described calibrating pipeline in the time examining and determine;
Described drive unit is connected with described caisson, is used to described caisson that power is provided, and makes described caissonVolume diminish;
Described transfer valve is connected with described caisson by common pall, and described transfer valve is by return line and normal flowGenerator is connected, and described transfer valve is also connected with gas exhaust piping, and described transfer valve is used for connecting common pall and return line,So that the test gas storing in described caisson is filled with in standard flow quantity generators, or connect common pall and blast pipeRoad, so that the gas in described caisson and each pipeline is discharged.
2. gas flow calibrating installation according to claim 1, is characterized in that, described caisson comprises sealed liquid cellAnd storage cover; In described sealed liquid cell, sealing fluid is housed; Described storage cover is tubular structure, its bottom opening, top seal, the endPortion is immersed in sealing fluid, and top is in sealing fluid top, so that described storage cover and sealing fluid form enclosure space; Detective tubeRoad and common pall are communicated with this enclosure space respectively.
3. gas flow calibrating installation according to claim 2, is characterized in that, the sidewall of described sealed liquid cell with described inGap between the sidewall of storage cover is more than or equal to 3cm, is less than or equal to 5cm.
4. gas flow calibrating installation according to claim 2, is characterized in that, described sealing fluid is oil.
5. gas flow calibrating installation according to claim 2, is characterized in that, described drive unit comprise action bars andAir motor; Described action bars is arranged at the top of described storage cover; Described air motor is connected with described action bars, is used toDescribed action bars provides the power moving downward, so that storage cover moves downward, and the sealing sky that storage cover and sealing fluid are formedInterior gas is discharged.
6. gas flow calibrating installation according to claim 2, is characterized in that, described gas flow calibrating installation also wrapsDraw together the stable-pressure device being connected with described caisson, for realizing in the enclosure space that described storage cover and sealing fluid are formedThe adjustment of gas pressure.
7. gas flow calibrating installation according to claim 1, is characterized in that, described caisson gas thereinMaximum volume under the state of constant pressure is more than or equal to the maximum volume of standard flow quantity generators.
8. gas flow calibrating installation according to claim 1, is characterized in that, described gas flow calibrating installation also wrapsDraw together:
Be arranged on the flow control valve in calibrating pipeline and between table access port to be checked and caisson, for examining and determineIn journey, regulate the flow of test gas in calibrating pipeline, so that obtain table to be checked and standard flow quantity generators under different flowBetween error ratio to data.
9. gas flow calibrating installation according to claim 1, is characterized in that, described gas flow calibrating installation also wrapsDraw together thermostatic chamber, table access port to be checked is positioned at described thermostatic chamber, and described thermostatic chamber is for making the operating mode temperature of table to be checked in specifyingIn degree environment.
10. gas flow calibrating installation according to claim 9, is characterized in that, described gas flow calibrating installation alsoComprise the heat exchanger being arranged in calibrating pipeline and between standard flow quantity generators and table access port to be checked, described heat exchangerBe arranged in thermostatic chamber, described heat exchanger is for regulating the temperature of test gas, makes in the temperature of test gas and thermostatic chamberTemperature is consistent.
11. gas flow calibrating installations according to claim 1, is characterized in that, described gas flow calibrating installation alsoComprise:
Be arranged at the temperature sensor in calibrating pipeline and between standard flow quantity generators and table access port to be checked, described temperatureDegree sensor next-door neighbour standard flow quantity generators;
Be arranged at the pressure sensor in calibrating pipeline and between standard flow quantity generators and table access port to be checked, described pressurePower sensor next-door neighbour standard flow quantity generators.
12. gas flow calibrating installations according to claim 1, is characterized in that, described gas flow calibrating installation alsoComprise:
Be arranged at the temperature sensor in calibrating pipeline and between standard flow quantity generators and table access port to be checked, described temperatureDegree sensor is close to table access port to be checked;
Be arranged at the pressure sensor in calibrating pipeline and between standard flow quantity generators and table access port to be checked, described pressurePower sensor is close to table access port to be checked.
13. gas flow calibrating installations according to claim 1, is characterized in that, described gas flow calibrating installation alsoComprise:
Be arranged at the temperature sensor in calibrating pipeline and between table access port to be checked and caisson, described TEMPDevice is close to table access port to be checked;
Be arranged at the pressure sensor in calibrating pipeline and between table access port to be checked and caisson, described pressure sensingDevice is close to table access port to be checked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521111855.8U CN205262556U (en) | 2015-12-28 | 2015-12-28 | Gas flow detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521111855.8U CN205262556U (en) | 2015-12-28 | 2015-12-28 | Gas flow detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205262556U true CN205262556U (en) | 2016-05-25 |
Family
ID=56004078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521111855.8U Expired - Fee Related CN205262556U (en) | 2015-12-28 | 2015-12-28 | Gas flow detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205262556U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153162A (en) * | 2016-08-31 | 2016-11-23 | 新奥科技发展有限公司 | Gas flowmeter detection equipment |
| CN106404125A (en) * | 2016-08-31 | 2017-02-15 | 新奥科技发展有限公司 | Detection device for gas flow meter |
| CN111141369A (en) * | 2019-12-26 | 2020-05-12 | 兰州空间技术物理研究所 | Gas flow controller flow calibration device for space |
-
2015
- 2015-12-28 CN CN201521111855.8U patent/CN205262556U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153162A (en) * | 2016-08-31 | 2016-11-23 | 新奥科技发展有限公司 | Gas flowmeter detection equipment |
| CN106404125A (en) * | 2016-08-31 | 2017-02-15 | 新奥科技发展有限公司 | Detection device for gas flow meter |
| CN111141369A (en) * | 2019-12-26 | 2020-05-12 | 兰州空间技术物理研究所 | Gas flow controller flow calibration device for space |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205262556U (en) | Gas flow detection device | |
| AU2011294831B2 (en) | Apparatus and method for phase equilibrium with in-situ sensing | |
| CN109313100A (en) | Valve pressure-proof inspection device and its inspection method and hydrogen detection unit | |
| CN101358871A (en) | Actual flow circle calibrating apparatus for gas flowmeter and calibrating method thereof | |
| CN102183284B (en) | Liquid flow standard calibration device | |
| CN1643344A (en) | Flow rate measuring method and flowmeter, flow rate measuring section package used for them and flow rate measuring unit using them, and piping leakage inspection device using flowmeter | |
| CN111272341A (en) | Battery box electrolyte leakage detection device and electrolyte leakage detection method | |
| US20180188700A1 (en) | Apparatus for controlling flow and method of calibrating same | |
| JP5525374B2 (en) | Flow rate standard and flow rate calibration method using the same | |
| CN109855705A (en) | A kind of the oil flowmeter calibrating installation and calibration method of real-time dynamic compensation temperature variation | |
| CN108469390B (en) | Detachable loop type single-phase flow erosion test device | |
| JPH07281760A (en) | Absolute flow rate inspection system for mass flow controller | |
| CN102339655B (en) | Temperature-controlled inflatable vacuum radiation equipment | |
| CN109211367A (en) | A kind of pVTt method gas flow standard device | |
| CN208282905U (en) | A kind of gas flowmeter reality stream circulation calibrating installation | |
| CN205262555U (en) | Gas flow detection device | |
| CN101196457B (en) | Gas analyzer | |
| CN109810726A (en) | A kind of aqueous mixed working fluid generating device of high temperature and pressure and technique | |
| JP2006275906A (en) | Leakage inspection method and system | |
| CN212007656U (en) | Battery box electrolyte leakage detection device | |
| CN105403290A (en) | Natural gas circular flow standard test system | |
| CN202049093U (en) | Evaluation test device for oil soluble antisludging agent | |
| CN110411676B (en) | Valve leakage detection device | |
| CN204882162U (en) | Self -disposable formula oil well associated gas hydrogen sulfide sampling test device of row of exempting from | |
| CN109211366A (en) | A kind of Multipurpose gas flow standard device based on air supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170719 Address after: Henan province 475004 City Road No. 90 song Patentee after: KAIFENG XINAO GAS CO.,LTD. Address before: The 065001 Hebei economic and Technological Development Zone of Langfang Huaxiang new Austrian Science and Technology Park in the Southern District B building room 522 Patentee before: ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160525 Termination date: 20211228 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |