CN203672461U - Calibrating device of gas flowmeter - Google Patents

Calibrating device of gas flowmeter Download PDF

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Publication number
CN203672461U
CN203672461U CN201320890071.4U CN201320890071U CN203672461U CN 203672461 U CN203672461 U CN 203672461U CN 201320890071 U CN201320890071 U CN 201320890071U CN 203672461 U CN203672461 U CN 203672461U
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China
Prior art keywords
gas
flowmeter
standard
flow
calibrating installation
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Expired - Fee Related
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CN201320890071.4U
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Chinese (zh)
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陈夏
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Guangxi Yuchai Machinery Co Ltd
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Guangxi Yuchai Machinery Co Ltd
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Abstract

The utility model discloses a calibrating device of a gas flowmeter. The calibrating device of the gas flowmeter comprises a gas tank, a standard mass flowmeter and a detected gas flowmeter. A temperature/humidity transmitter and an atmospheric pressure transmitter are arranged in the gas tank. The standard mass flowmeter is connected with the gas inlet end of the gas tank, and a solenoid valve and a regulating valve are arranged on a connecting pipe. The detected gas flowmeter is connected with the gas outlet end of the gas tank. A calibrating method of the gas flowmeter is simple and reasonable in step, a standard Coriolis mass flowmeter is used as a standard, the regulating valve is combined, a required flow value is regulated in a stepless mode, the defect that a sonic Venturi nozzle calibration device cannot obtain any flow value is overcome, gas state parameter measurement is little, the size is small, and the efficiency, the reliability and the accuracy are all high.

Description

Gas meter calibrating installation
Technical field
The utility model relates to gas meter calibrating field, particularly a kind of gas meter calibrating installation.
Background technology
The measurement index of gas meter 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 gas meter calibrating installation has: 1. bell-jar gas flow calibrating installation; 2. sonic venturi calibrating installation; 3. standard scale direct comparison method calibrating installation.
1. the principle of work of bell-jar gas flow calibrating installation is, gas is passed through in the bell jar of propulsion system injection device, gas in bell jar is under the self-gravity action of bell jar, discharge by gas outlet, throttling valve, tested flowmeter, make tested flowmeter have the flow value of measuring and show air-flow under stable air-flow.Tested flowmeter displayed value, the normal stream value calculating with the reduction of gas volume in bell jar and corresponding elapsed time compares, calculate tested flowmeter error.Various flows value obtains by a variable valve adjustment.
2. the principle of work of sonic venturi calibrating installation is: utilize sonic venturi gas pressure difference before and after nozzle to reach after specific critical point, the characteristic that mass rate is invariable, obtains stable flow value as standard value.This fluid flows through with it the tested flowmeter of serial connection simultaneously, and tested flowmeter shows the measured value to this fluid, by with the comparison of standard value, obtain tested flowmeter error.Various flows value obtains by different sonic venturi combinations.
3. standard scale direct comparison method calibrating installation principle of work is: with power, gas flow is crossed and be serially connected in proving flowmeter and the tested flowmeter in same pipeline, obtain the error of tested table by comparing the size of two indicating values.Various flows value obtains by a variable valve adjustment.
The each calibrating process of above-mentioned 1. method is guarantee normal flow accurate, all to ensure a certain amount of gas consumption, time consuming sampling is according to the difference of design, for guaranteeing precision, also to ensure certain time interval, so once inject air and generally can only complete the calibrating of a flow point, and gas injection process is also wanted elapsed time, each process finishes the rear result that just can calculate.Each flow point regulates the time that spends again even multiple processes.Determined thus the inefficiency of the method, had the high bulky shortcoming of cost simultaneously, its advantage is that precision is high, stability is high, reproducible.。
Above-mentioned 2. method Calibrating Gas Flow Meter needs the parameter of multiple positions gaseous state of gas-monitoring as pressure, temperature, humidity, and the measuring error of these parameters has influence on the precision of calibrating gas flow value.Make the uncertainty of verification result larger.There is complex structure simultaneously, calculation of complex, annex is more, the shortcoming that cost is higher.Simultaneously each sonic venturi is a fixing flow value, and the flow value of one group of sonic venturi combination is limited, can not be adjusted under maximum range flow value arbitrarily.
Above-mentioned 3. method is the simplest, but shortcoming also clearly: precision is difficult to improve, and the very difficulty that meets the requirement of high precision standard scale is looked for; The standard scale that the tested table of different ranges need to be joined corresponding range could cover, and stability is not high, the repeated method being not so good as 1. 2., and the adjusting of each flow point also takies the process time, is unfavorable for raising the efficiency.
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, adopt Coriolis standard quality flowmeter as standard, be combined with variable valve, the flow value that step-less adjustment is required, solved sonic venturi calibrating installation and can not obtain the shortcoming of any flow value, and gaseous state parameter measurement is few, volume is little, all high gas meter calibrating installations of efficiency, reliability and accuracy.
For achieving the above object, provide a kind of gas meter calibrating installation according to the utility model, comprising:
Gas tank, inside is laid with temperature/humidity transmitter and atmospheric pressure transmitter;
Standard quality flowmeter, is connected with the inlet end of gas tank, and on connecting line, is laid with solenoid valve and variable valve;
Gas flowmeter body, is connected with the outlet side of gas tank.
In technique scheme, this gas meter calibrating installation adopts pressurized air to do source of the gas.
In technique scheme, standard quality flowmeter adopts Coriolis standard quality flowmeter.
In technique scheme, standard quality flowmeter is connected with the inlet end of gas tank by three branch roads, is laid with solenoid valve and variable valve on each branch road.
Compared with prior art, the utlity model has following beneficial effect: this gas meter calibration method simple and reasonable steps, adopt Coriolis standard quality flowmeter as standard, be combined with variable valve, the flow value that step-less adjustment is required, solved sonic venturi calibrating installation and can not obtain the shortcoming of any flow value, and gaseous state parameter measurement is few, volume is little, and efficiency, reliability and accuracy are all high.
Accompanying drawing explanation
Fig. 1 is the structural representation of gas meter calibrating installation of the present utility model;
Fig. 2 is the process flow diagram of gas meter calibration method of the present utility model;
Description of reference numerals:
1-gas tank, 11-temperature/humidity transmitter, 12-atmospheric pressure transmitter, 2-Coriolis standard quality flowmeter, 21-solenoid valve, 22-variable valve, 3-gas flowmeter body, 4-computing machine, 5-solenoid control module, 6-voltage measurement module.
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.
Gas meter calibration method simple and reasonable steps of the present utility model, adopt Coriolis standard quality flowmeter as standard, be combined with variable valve, the flow value that step-less adjustment is required, solve the shortcoming that sonic venturi calibrating installation can not obtain any flow value, and gaseous state parameter measurement is few, and volume is little, efficiency, reliability and accuracy are all high.
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 gas flow direction) as shown in Figure 1, this gas meter calibration method realizes the calibrating of gas meter by computer program control verification device, calibrating installation comprises: gas tank 1, and the Coriolis standard quality flowmeter 2, the gas flowmeter body 3 that are connected respectively with gas tank 1 inlet end, outlet side.In gas tank 1, be laid with temperature/humidity transmitter 11 and atmospheric pressure transmitter 12, for measuring the state parameter of gas and being transformed into the curtage signal corresponding with parameter, this curtage signal is input to voltage measurement module 6 and completes temperature, humidity, pressure force measurement and read by PORT COM by computing machine 4.Coriolis standard quality flowmeter 2 is connected with gas tank 1 inlet end by three branch roads, on each branch road, be laid with solenoid valve 21 and variable valve 22, solenoid valve 21 is given an order to solenoid control module 5 by the PORT COM of computing machine 4, select one or more solenoid valves 21 to open, make corresponding branch road flow through gases at high pressure and enter gas tank 1.This calibrating installation adopts commercial production stable pressurized air used as calibrating medium, with coriolis mass flowmeters as standard, the source of the gas of high pressure flows through after Coriolis standard quality flowmeter, enter three variable valve and solenoid valve branch road, make corresponding branch road flow through gases at high pressure and enter gas tank.Gas flows through gas flowmeter body by pipeline again in tank, and measured value is measured and obtained to tested flowmeter to the gas flow flowing through in pipe, and this measured value can be read or do not read to such an extent that input computing machine by calibrating people again by computing machine.According to fluid continuity principle, the gas flow actual value that gas flowmeter body is measured is the volumetric flow of gas of standard; Computing machine compares computing the tested table measured value and the standard value that collect, obtains this measuring error and corresponding uncertainty in real time.This gas meter calibration method adopts Coriolis standard quality flowmeter as standard, be combined with variable valve, the flow value that step-less adjustment is required, solve the shortcoming that sonic venturi calibrating installation can not obtain any flow value, and gaseous state parameter measurement is few, volume is little, and efficiency, reliability and accuracy are all high.
As shown in Figure 2, the verification process of this gas meter calibration method is as follows:
First, computing machine is given an order to solenoid control module by PORT COM, selects one or more solenoid valves 21 to open, and makes corresponding branch road flow through gases at high pressure and enters gas tank 1.Wherein, three solenoid valves 21,20%, 40%, 60% range of corresponding gas flowmeter body 3 in the time opening separately respectively, can obtain 80%, 100%, 120% other range by combination; The tested flowmeter of each range is in the time examining and determine for the first time, set up respectively a flow point 20%, 40%, 60% by the variable valve before the branch road at three solenoid valve places and can obtain the flow point that all calibratings require, second beginning, without doing again this step, the flow of each calibrating point switches by solenoid control module fast by computing machine, in the time that the tested flowmeter of same range is examined and determine in batches, can obtain high calibrating efficiency.
Secondly, gases at high pressure enter after gas tank 1, are reduced for normal pressure stable, are measured the state parameter of gas and are transformed into the curtage signal corresponding with parameter by the temperature/humidity transmitter 11 and the atmospheric pressure transmitter 12 that are contained in gas tank; It is (preferred that the curtage signal of transmitter is input to voltage measurement module, voltage measurement module adopts and grinds China's control Science and Technology Ltd. 4017 modules automatically) complete temperature, humidity, pressure force measurement and read by PORT COM by computing machine, calculated again the density of gas in tank by the data processor in computing machine, this density value calculates with the mass flow value being obtained to Coriolis standard quality flowmeter by PORT COM by computing machine, obtains the volumetric flow of gas of standard.Adopt industrial pressurized air used to do source of the gas, can examine and determine continuously, do not had bell-jar gas flow calibrating installation to want the process of intermittent gas injection, can greatly raise the efficiency.This device adopts Coriolis standard quality flowmeter 2 as standard, with variable valve 22 combinations, can the required flow value of step-less adjustment, solve the shortcoming that sonic venturi calibrating installation can not obtain any flow value, and gaseous state parameter measurement only has three, fewer more than one times than sonic venturi calibrating installation, volume is also less, and whole device reliability is higher and accurate.In addition, Coriolis standard quality flowmeter has high precision and long-time stability, and useful range is wide, and single Coriolis standard quality flowmeter can cover extremely wide tested flowmeter range.Do not need to be equipped with corresponding proving flowmeter for the tested flowmeter of different ranges.
Again, the interior gas of gas tank 1 flows through gas flowmeter body 3 by pipeline, and measured value is measured and obtained to tested flowmeter to the gas flow flowing through in pipe, and this measured value can be read or be read to such an extent that input computing machine by calibrating people again by computing machine.According to fluid continuity principle, the gas flow actual value that gas flowmeter body is measured is the volumetric flow of gas of standard.
Finally, computing machine compares computing the tested table measured value and the standard value that collect, obtains this measuring error and corresponding uncertainty in real time.There is no artificial computation process, all data processings by computer program collection, calculated, favourable to preventing mistake and alleviating testing person's labour intensity.Do not had bell-jar gas flow calibrating installation volume large, space hold is many, the shortcoming that cost is high.
Repeat said process, complete 20%, 40%, 60%, 80%, 100% each flow point of vertification regulation requirement, and can 120% flow point be detected according to actual requirement.Then, whether computing machine judges tested flowmeter survey qualified according to data automatically, and determines acquired results data to carry out the operation of whether preserving according to operator's instruction.Computing machine to there being the calibrating record of data, calls certificate template according to operator's instruction, the calibration certificate of the tested flowmeter that output is selected by operator.
To sum up, this gas meter calibration method simple and reasonable steps, adopt Coriolis standard quality flowmeter as standard, be combined with variable valve, the flow value that step-less adjustment is required, solved sonic venturi calibrating installation and can not obtain the shortcoming of any flow value, and gaseous state parameter measurement is few, volume is little, and efficiency, reliability and accuracy are all high.
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 gas meter calibrating installation, is characterized in that, comprising:
Gas tank, inside is laid with temperature/humidity transmitter and atmospheric pressure transmitter;
Standard quality flowmeter, is connected with the inlet end of described gas tank, and on connecting line, is laid with solenoid valve and variable valve;
Gas flowmeter body, is connected with the outlet side of described gas tank.
2. gas meter calibrating installation according to claim 1, is characterized in that: this gas meter calibrating installation adopts pressurized air to do source of the gas.
3. gas meter calibrating installation according to claim 1, is characterized in that: described standard quality flowmeter adopts Coriolis standard quality flowmeter.
4. gas meter calibrating installation according to claim 1 and 2, is characterized in that: described standard quality flowmeter is connected with the inlet end of gas tank by three branch roads, is laid with solenoid valve and variable valve on each branch road.
CN201320890071.4U 2013-12-31 2013-12-31 Calibrating device of gas flowmeter Expired - Fee Related CN203672461U (en)

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103759793A (en) * 2013-12-31 2014-04-30 广西玉柴机器股份有限公司 Calibration device and method for gas flow meter
CN108168658A (en) * 2018-02-06 2018-06-15 温州鼎程电子科技有限公司 A kind of calibration facility of automobile air-flow sensor
CN109138979A (en) * 2018-10-25 2019-01-04 中石化石油工程技术服务有限公司 The method and measuring equipment of equal flows branch path metering oil gas water well yield
CN113899431A (en) * 2021-09-07 2022-01-07 上海裕凡实业有限公司 Mobile flow online calibration system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103759793A (en) * 2013-12-31 2014-04-30 广西玉柴机器股份有限公司 Calibration device and method for gas flow meter
CN108168658A (en) * 2018-02-06 2018-06-15 温州鼎程电子科技有限公司 A kind of calibration facility of automobile air-flow sensor
CN109138979A (en) * 2018-10-25 2019-01-04 中石化石油工程技术服务有限公司 The method and measuring equipment of equal flows branch path metering oil gas water well yield
CN113899431A (en) * 2021-09-07 2022-01-07 上海裕凡实业有限公司 Mobile flow online calibration system

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GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140625

Termination date: 20181231

CF01 Termination of patent right due to non-payment of annual fee