CN203629649U - Mass flow meter calibrating device - Google Patents
Mass flow meter calibrating device Download PDFInfo
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- CN203629649U CN203629649U CN201320889778.3U CN201320889778U CN203629649U CN 203629649 U CN203629649 U CN 203629649U CN 201320889778 U CN201320889778 U CN 201320889778U CN 203629649 U CN203629649 U CN 203629649U
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Abstract
The utility model discloses a mass flow meter calibrating device. The mass flow meter calibrating device comprises a fluid reserving pond, a constant-flow constant-pressure pump arranged between the fluid reserving pond and the liquid inlet end of a measured flow meter, a fluid collecting bag and a fluid reserving pond return pipe, wherein the fluid collecting bag and the fluid reserving pond return pipe are connected at the liquid outlet end of the measured flow meter in parallel, and a switchover magnetic valve I and a switchover magnetic valve II are respectively arranged at the liquid inlet ends of the fluid collecting bag and the fluid reserving pond return pipe. A mass flow meter calibrating method is simple and reasonable in step, fluid switching and timing starting and stopping are synchronously controlled by a computer through a software module, fluid mass sampling corresponds to the sampling time strictly and synchronously, the mass flow meter calibrating device is simple and efficient, avoids fluid mass loss errors existing in the man-made calibrating process and indication errors and timing errors caused by fluid flowing state fluctuation and enables errors serving as standard flow values to be large.
Description
Technical field
The utility model relates to mass flowmeter calibrating field, particularly a kind of calibrating apparatus of quality flowmeter.
Background technology
The measurement index of mass flowmeter need to be through obtaining definite with normal flow comparison.Flowmeter after production completes will be through demarcating, and meets the sale of just can dispatching from the factory after the index of dispatching from the factory; Flowmeter in use is wanted periodic verification or calibration, to guarantee that it is accurate.Calibrating installation can produce the actual flow of standard, can be used as the standard value of flow, for the flow value relatively reference with it of tested flowmeter, determines error size, to judge whether accredited flowmeter meets the precision index of its nominal.
Existing calibrating apparatus of quality flowmeter has: 1. examine and determine mass flowmeter by start and stop method with mass accumulation, the mass value that flows through the liquid of tested mass flowmeter by weighing (weighing) obtains standard value, relatively obtains with it the index of tested flowmeter by the mass accumulation value of tested cmf record or demonstration; This method can not be examined and determine the instantaneous delivery index of flowmeter.2. obtain by switching method liquid quality and interval switching time, front and back of flowing through tested mass flowmeter, calculate the instantaneous delivery of calibrating installation as the actual value of tested mass flowmeter, compare with it by the indicating value with tested mass flowmeter, obtain the instantaneous delivery error criterion of tested flowmeter.The method realizing has switch fluids and two kinds of the outer switch fluids of pipe in fluid hose, and the start and stop of time in the time that fluid switches have automatically and manual two kinds of methods.There is the mass loss because splashing, volatilize and causing in fluid access fluid cumulative container processes in the method, and in handoff procedure, the fluctuation of fluid-flow rate (for switching method in fluid hose) causes indicating value fluctuation, introduces measuring error.Also there is larger timing error in start and stop timer manually.Make whole device can not reach high precision.
Utility model content
The utility model is in order to overcome defect in above-mentioned prior art, a kind of simple and reasonable steps is provided, the switching of fluid and the start and stop of timing are passed through software module synchro control by computing machine, the sampling and the sampling time that guarantee fluid mass are strict synchronous corresponding, simple and efficient, avoid the fluid mass existing in artificial verification process to lose index error and the time timing error of error and fluid flow state fluctuation introducing, make the calibrating apparatus of quality flowmeter larger as the error of normal stream value.
For achieving the above object, provide a kind of calibrating apparatus of quality flowmeter according to the utility model, comprising:
Fluid deposit and remittance pond;
Constant current constant voltage pump, is laid between fluid deposit and remittance pond and measured flux meter liquid feeding end;
Fluid collection capsule and fluid deposit and remittance pond recirculatory pipe, parallel connection is laid in measured flux meter outlet end, and the liquid feeding end of fluid collection capsule and fluid deposit and remittance pond recirculatory pipe is laid with respectively switching solenoid valve one, switching solenoid valve two.
In technique scheme, between constant current constant voltage pump and measured flux meter, be laid with automatic exhaust steam valve.
In technique scheme, between measured flux meter and fluid collection capsule in parallel and fluid deposit and remittance pond recirculatory pipe, be also laid with afterflow air chamber.
In technique scheme, on the pipeline between measured flux meter and afterflow air chamber, be laid with variable valve.
Compared with prior art, the utlity model has following beneficial effect: this mass flowmeter calibration method simple and reasonable steps, the switching of fluid and the start and stop of timing are passed through software module synchro control by computing machine, the sampling and the sampling time that guarantee fluid mass are strict synchronous corresponding, simple and efficient, avoid the fluid mass existing in artificial verification process to lose index error and the time timing error of error and fluid flow state fluctuation introducing, make as the error of normal stream value larger.
Accompanying drawing explanation
Fig. 1 is the structural representation of calibrating apparatus of quality flowmeter of the present utility model;
Fig. 2 is the process flow diagram of mass flowmeter calibration method of the present utility model;
Description of reference numerals:
1-fluid deposit and remittance pond, the tested flowmeter of 2-, 21-variable valve, 3-constant current constant voltage pump, 31-automatic exhaust steam valve, 4-fluid collection capsule, 41-switching solenoid valve one, 5-fluid deposit and remittance pond recirculatory pipe, 51-switching solenoid valve two, 6-afterflow air chamber.
Embodiment
Below in conjunction with accompanying drawing, an embodiment of the present utility model is described in detail, but is to be understood that protection domain of the present utility model is not subject to the restriction of embodiment.It will be appreciated that, mentioned in following embodiment of the present utility model " on ", D score, " left side ", " right side ", " front " and " reverse side " be all take the direction shown in each figure as benchmark, these words that are used for limiting direction are only used to be convenient to explanation, do not represent the restriction to the concrete technical scheme of the utility model.
Mass flowmeter calibration method simple and reasonable steps of the present utility model, the switching of fluid and the start and stop of timing are passed through software module synchro control by computing machine, the sampling and the sampling time that guarantee fluid mass are strict synchronous corresponding, simple and efficient, avoid the fluid mass existing in artificial verification process to lose index error and the time timing error of error and fluid flow state fluctuation introducing, make as the error of normal stream value larger.
Detailed description by way of example but unrestriced mode has illustrated the disclosure, should be understood that the realization that can be combined by independent realization or with other aspects in various aspect of the present disclosure below.This instructions clearly enables those skilled in the art to manufacture and uses us to believe for new and non-obvious improvement, describe some embodiment, alternative, modification, alternatives and system applies, comprised the current best mode that is considered to carry out the utility model principle of describing in this instructions.In the time describing element or feature and/or embodiment, be intended to expression titled with " one " " one " " be somebody's turn to do " and " described " and there are one or more in element or feature.Term " comprises " that " comprising " and " having " is intended to is comprising property, and also has extra element or feature beyond being illustrated in those specifically described elements or feature.
(arrow represents liquid flow direction) as shown in Figure 1, this mass flowmeter calibration method realizes the calibrating of mass flowmeter by computer program control verification device, calibrating installation comprises: fluid deposit and remittance pond 1 and be laid in fluid deposit and remittance pond 1 and measured flux meter 2 liquid feeding ends between constant current constant voltage pump 3, and in parallel fluid collection capsule 4 and the fluid deposit and remittance pond recirculatory pipe 5 that is laid in measured flux meter 2 outlet ends.
Constant current constant voltage pump 3 is for the liquid for calibrating in withdrawn fluid deposit and remittance pond 1 (generally using clean water), in the pipeline that installs tested flowmeter 2, the fluid of mineralization pressure and flow speed stability is for flowmeter survey, before calibrating, computing machine does not send any steering order, is pooled to the interior formation recurrent state in fluid deposit and remittance pond 1 through the fluid of tested flowmeter 2 by fluid deposit and remittance pond recirculatory pipe 5; When calibrating, collect capsule 4 through the fluid incoming fluid of tested flowmeter 2, then obtain the liquid quality of incoming fluid collection capsule 4 with balance/weight measurement.
Between constant current constant voltage pump 3 and measured flux meter 2, be laid with automatic exhaust steam valve 31, for guaranteeing that the fluid that pipeline flows into flowmeter is not with any air, and guarantee pressure stability; Between measured flux meter 2 and fluid collection capsule 4 in parallel and fluid deposit and remittance pond recirculatory pipe 5, be also laid with afterflow air chamber 6, on pipeline between measured flux meter 2 and afterflow air chamber 6, be laid with variable valve 21, between two outlet ends of afterflow air chamber 6 and fluid collection capsule 4 in parallel and fluid deposit and remittance pond recirculatory pipe 5, be laid with respectively switching solenoid valve 1, switching solenoid valve 2 51; The room pressure of afterflow air chamber 6 equals hydrodynamic pressure, in switching solenoid valve 1,2 51 two solenoid valve handoff procedures of switching solenoid valve, the impossible absolute synchronization of action, existence is opened in the pipeline section of valve branch road liquid by the static hysteresis that accelerates to flow rate of liquid in flowmeter, within the time of this hysteresis, flowmeter endpiece pressure changes, and can cause variation or the short interruption of transient flow indicating value.Before fluid switching solenoid valve, install afterflow air chamber additional, because gas has very big elasticity than liquid, can absorb or cushion the pressure of this variation, can keep the flow rate of liquid in flowmeter stable.Variable valve 21 regulates the uninterrupted of measured flux meter 2 for variable valve, to complete the calibrating of each calibrating point.
As shown in Figure 2, the verification process of this mass flowmeter calibration method is as follows:
First, calibrating installation is placed under same ambient room temperature, to guarantee fluid and each ingredient isothermal;
Secondly, by the liquid for calibrating (generally using clean water) in constant current constant voltage pump 3 withdrawn fluid deposit and remittance ponds 1, in the pipeline that installs tested flowmeter 2, the fluid of mineralization pressure and flow speed stability is for flowmeter survey, this computer-chronograph does not send any steering order, switching solenoid valve 1 is closed, switching solenoid valve 2 51 is opened, and fluid is pooled to the interior formation recurrent state in fluid deposit and remittance pond 1 by fluid deposit and remittance pond recirculatory pipe 5; The automatic exhaust steam valve 31 of tested flowmeter 2 front ends guarantees that the fluid that flows into flowmeter in pipeline is not with any air, and guarantees pressure stability;
Again, after calibrating is in stable condition with liquid-circulating, move by computer control switching solenoid valve, form the state that switching solenoid valve 1 is opened, switching solenoid valve 2 51 closes, fluid injects in fluid collection capsule 4 (collects capsule oral area and the deadend of effuser outer wall).Meanwhile, computing machine starts the calibrating time to sample.
The 10MHz time standard frequency division that the sampling process of calibrating time is specifically inputted universal counter by the circuit module of computing machine is that the 1 millisecond of burst length frequency marking obtaining after 1kHz shaping has been held and turned back to universal counter measuring junction by 1msOut, and universal counter is to 1 millisecond of time frequency marking counting.
When the interior accumulation of fluid of fluid collection capsule 4 is to after a certain amount of, move by computer control switching solenoid valve, form the state that switching solenoid valve 1 closes, switching solenoid valve 2 51 is opened, fluid is pooled in fluid deposit and remittance pond 1 and is again formed recurrent state by fluid deposit and remittance pond recirculatory pipe 5; Meanwhile, computing machine completes tested flowmeter instantaneous delivery indicating value and the sampling of time; Tested flowmeter instantaneous delivery indicating value can collect (if tested flowmeter possesses communication function) by PORT COM to tested flowmeter by computing machine, also can manually input the tested flowmeter indicating value that testing person reads.
When the sampling of calibrating time completes, the path that the circuit module of computing machine turns back to universal counter measuring junction time frequency marking cuts off, and universal counter stops 1 millisecond of burst length frequency marking counting; Before switching solenoid valve one 41 passes, switching solenoid valve 2 51, afterflow air chamber 6 is housed, room pressure equals hydrodynamic pressure, and fluid flows through flowmeter fluid while switching still keeps constant speed; The switching of fluid and the start and stop of timing by software module synchro control, guarantee that the sampling of fluid mass and sampling time are strict synchronous corresponding by computing machine.
Finally, fluid collection capsule 4 use sealing of lids (having measured the quality of empty pocket and lid in advance), guarantee can not volatilize because of liquid-to-air contact; The sampling time input computer data processing module that the liquid quality obtaining with balance/weight measurement and universal counter are shown, calculates error and this uncertainty of measurement between the standard value that tested flowmeter instantaneous delivery indicating value and calibrating installation provide by computing machine; Under air-tight state, collect sampling fluid with the cystic container after emptying rather than with rigid container, can guarantee that fluid is not exposed in air, avoided splashing and volatilizing of fluid, do not lose any sampling quality.Device Control & data acquisition is processed and is completed by computing machine completely, simple and efficient, there is no personal error.
In addition, by variable valve 21 adjust flux sizes, repeat art process by calibrating requirement, complete the calibrating of each calibrating point; All calibrating points complete after calibrating, are automatically processed and saving result, for inquiry and output calibration certificate by computer data processing module.
To sum up, this mass flowmeter calibration method simple and reasonable steps, the switching of fluid and the start and stop of timing are passed through software module synchro control by computing machine, the sampling and the sampling time that guarantee fluid mass are strict synchronous corresponding, simple and efficient, avoid the fluid mass existing in artificial verification process to lose index error and the time timing error of error and fluid flow state fluctuation introducing, make as the error of normal stream value larger.
Disclosed is above only several specific embodiment of the present utility model, and still, the utility model is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection domain of the present utility model.
Claims (4)
1. a calibrating apparatus of quality flowmeter, is characterized in that, comprising:
Fluid deposit and remittance pond;
Constant current constant voltage pump, is laid between described fluid deposit and remittance pond and measured flux meter liquid feeding end;
Fluid collection capsule and fluid deposit and remittance pond recirculatory pipe, parallel connection is laid in described measured flux meter outlet end, and the liquid feeding end of described fluid collection capsule and fluid deposit and remittance pond recirculatory pipe is laid with respectively switching solenoid valve one, switching solenoid valve two.
2. calibrating apparatus of quality flowmeter according to claim 1, is characterized in that: between described constant current constant voltage pump and measured flux meter, be laid with automatic exhaust steam valve.
3. calibrating apparatus of quality flowmeter according to claim 1 and 2, is characterized in that: between described measured flux meter and fluid collection capsule in parallel and fluid deposit and remittance pond recirculatory pipe, be also laid with afterflow air chamber.
4. calibrating apparatus of quality flowmeter according to claim 3, is characterized in that: on the pipeline between described measured flux meter and afterflow air chamber, be laid with variable valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320889778.3U CN203629649U (en) | 2013-12-31 | 2013-12-31 | Mass flow meter calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320889778.3U CN203629649U (en) | 2013-12-31 | 2013-12-31 | Mass flow meter calibrating device |
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| CN203629649U true CN203629649U (en) | 2014-06-04 |
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| CN201320889778.3U Expired - Fee Related CN203629649U (en) | 2013-12-31 | 2013-12-31 | Mass flow meter calibrating device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103743455A (en) * | 2013-12-31 | 2014-04-23 | 广西玉柴机器股份有限公司 | Mass flowmeter detecting device and detecting method |
| EP3133377A1 (en) * | 2015-08-21 | 2017-02-22 | Azbil Corporation | Method and apparatus for testing liquid flowmeter |
| CN110926571A (en) * | 2018-09-19 | 2020-03-27 | 联合汽车电子有限公司 | System and method for evaluating and correcting accuracy of fuel level sensor |
-
2013
- 2013-12-31 CN CN201320889778.3U patent/CN203629649U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103743455A (en) * | 2013-12-31 | 2014-04-23 | 广西玉柴机器股份有限公司 | Mass flowmeter detecting device and detecting method |
| CN103743455B (en) * | 2013-12-31 | 2016-06-29 | 广西玉柴机器股份有限公司 | Calibrating apparatus of quality flowmeter and calibration method |
| EP3133377A1 (en) * | 2015-08-21 | 2017-02-22 | Azbil Corporation | Method and apparatus for testing liquid flowmeter |
| CN106468590A (en) * | 2015-08-21 | 2017-03-01 | 阿自倍尔株式会社 | The test method of fluid flowmeter and assay device |
| US10151619B2 (en) | 2015-08-21 | 2018-12-11 | Azbil Corporation | Method and apparatus for testing liquid flowmeter |
| CN110926571A (en) * | 2018-09-19 | 2020-03-27 | 联合汽车电子有限公司 | System and method for evaluating and correcting accuracy of fuel level sensor |
| CN110926571B (en) * | 2018-09-19 | 2021-04-20 | 联合汽车电子有限公司 | System and method for evaluating and correcting accuracy of fuel level sensor |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140604 Termination date: 20181231 |