CN102003984A - Middle-low pressure gas flowmeter with small caliber - Google Patents
Middle-low pressure gas flowmeter with small caliber Download PDFInfo
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- CN102003984A CN102003984A CN 201010298742 CN201010298742A CN102003984A CN 102003984 A CN102003984 A CN 102003984A CN 201010298742 CN201010298742 CN 201010298742 CN 201010298742 A CN201010298742 A CN 201010298742A CN 102003984 A CN102003984 A CN 102003984A
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Abstract
The invention relates to a middle-low pressure gas flowmeter with small caliber, in particular to a manufacturing technology of an ultrasonic gas flowmeter, which is used for detecting the flow of gas and is especially suitable for detecting the gas flow under the micro flow velocity. The gas flowmeter comprises an ultrasonic measuring stub and an ultrasonic measuring unit, wherein the ultrasonic measuring stub comprises a flange (1), a stagnation cavity (2), an ultrasonic transducer seat (3) and a current stabilizer (5). The flowmeter has the advantages that the ultrasonic measuring unit carries out the measurement on the gas through an ultrasonic transducer (4) vertically arranged on the ultrasonic measuring stub, the detection and metering can be started from less than 0.5m<3>/h, the detection area of the sonic wave reaches more than 25% of the area to be measured, the measurement precision of the integral measurement range reaches 0.5%, and the measurement range ratio is larger than or equal to 80 to 1, thus, the requirement for high-precision measurement is met.
Description
Technical field
Mesolow small-bore gas flowmeter body relates to the manufacturing technology of ultrasonic gas flowmeter, is used for gas flow is detected, and is particularly useful for the gas flow under the small flow velocity is detected.
Background technology
Along with improving constantly of progress of industry and living standards of the people, use to all gases products such as rock gas, coal gas grows with each passing day, particularly a large amount of industrial users and commercial user, for the control requirement of enterprise cost, so require also more and more higher to the accurate measurement of the gas dosing measuring instrument of low discharge small-bore (DN25mm to DN80mm).The accurate measurement of gas flow is for energy savings, to save production cost, improve the product utilization rate all significant.
At present, mesolow small-bore gas flowmeter body (mainly being distributed in DN25 to DN80) commonly used both at home and abroad has: turbo flow meter, volumeter, restriction flowmeter, ultrasonic flow meter, the electromagnetic induction flowmeter, mass flowmeter, Roots type flowmeter etc., because the structure of this class gas meter standard cutting back, make this class gas meter mostly be below 1.0 grades to the class of accuracy of the measurement of gas flow, measurement range is less, and (range ratio is little, generally all at 5: 1 to 20: 1), and all can't accomplish the gas under the minimum velocity state is carried out the flow detection metering.In addition, be subjected to influence on flow field, the straight length that this class gas meter structurally all needs installation length to differ improves the measuring accuracy to gas flow, to increase range ratio, otherwise can't detect, and the installation of straight length makes the small-bore gas flowmeter body be subjected to certain restriction on the detection installation requirement.
Summary of the invention
At the deficiency of existing small-bore gas flowmeter body, the present invention proposes a kind of novel structure, constructs rational ultrasonic measurement cutting back and high-precision ultrasound measuring unit and combines, and can reach from less than 0.5m
3Wide range, the high-precision mesolow small-bore gas flowmeter body of/h starting metering.
The small-bore ultrasonic gas flow meter of the present invention is made of ultrasonic measurement cutting back and ultrasonic measurement unit two parts.The two ends of ultrasonic measurement cutting back are the stagnation chamber, in the stagnation chamber current regulator are set, and make can to play the effect of sluggish and stabilizing gas to entering gas in this cavity.The front end of current regulator is an inclined-plane ultrasonic reflections plate, and the end is oval thereafter.Position at inclined-plane ultrasonic reflections plate, both sides up and down at vertical ultrasonic measurement cutting back are fixedly equipped with the ultrasonic transducer seat, ultrasonic transducer is fixedly mounted in the ultrasonic transducer seat, by both sides up and down ultrasonic transducer is installed vertically, makes that the ultrasound wave sound path that is parallel to the flow field is identical.In the ultrasonic measurement cutting back, the internal diameter of measuring section is less than the internal diameter in stagnation chamber between the two stagnation chambeies, improve Reynolds number by the diameter that reduces measuring section, the diameter of two ultrasonic transducers and the internal diameter of measuring section keep quite, and the flow velocity that makes measured gas is the face velocity of measuring section internal diameter.
Small-bore gas flowmeter body of the present invention adopts by single-chip microcomputer, broadband emission/receiving element, the automatic amplitude control module of signal dynamics, low drift amplifier, the zero level signal checking unit, timing circuit, the high-precision ultrasound measuring unit that timing gate cell and ultrahigh frequency, high stable markers unit constitute.The ultrasonic measurement unit is measured gas by ultrasonic transducer, broadband emission/receiving element, and by the automatic amplitude control module of signal dynamics, received ultrasonic signal amplitude is controlled in the amplitude range of regulation, through high-gain, the zero level detecting signal unit is sent in the signal amplifier unit of low drift, detect the received signal of Zero crossing level, be equipped with 〉=the high markers of 100MHz by the timing gate cell again, the time of the sonic propagation of measuring, average after repeatedly measuring, make measuring accuracy increase substantially, the sound transit-time measurement precision is better than 0.1ns, thereby the measuring accuracy that guarantees the small-bore ultrasonic gas flow meter gamut of mesolow of the present invention reaches 0.5 grade, and range ratio is better than 80: 1, has reached the requirement of high-acruracy survey.
Characteristics of the present invention are: owing to do not establish straight length on the gas meter ultrasonic measurement cutting back of the present invention, novel structure, but in the ultrasonic measurement cutting back, be provided with stagnation chamber and current regulator, can make the gas that enters the measurement cutting back obtain stagnation and stable like this, play the function that inside has the flow field rectification.Reduce the diameter of measuring section, can improve Reynolds number, ultrasonic transducer vertically is set and the diameter of ultrasonic transducer and the diameter of measuring section are kept quite, sluggishness with gas, current stabilization, the diameter of transducer, the Reynolds number factors organically combine, by combining of ultrasonic measurement cutting back and high-precision ultrasound measuring unit, make the sonic detection area of the small-bore ultrasonic gas flow meter of mesolow of the present invention reach more than 25% of area of need survey, the measuring accuracy of gamut reaches 0.5 grade, range ratio is better than 80: 1, reach the standard of high-precision gas flow measurement instrument, and remedied that ultrasonic gas flow meter only is used for the big flow of heavy caliber and the shortcoming that small-bore low discharge is difficult to high-precision measuring.
Description of drawings
Accompanying drawing is a gas meter embodiment synoptic diagram of the present invention:
Fig. 1. be gas meter structural representation of the present invention,
Fig. 2. be gas meter testing circuit synoptic diagram of the present invention,
Among the figure: flange 1, stagnation chamber 2, ultrasonic transducer seat 3, ultrasonic transducer 4, current regulator 5, measuring section 6.
Embodiment
Gas meter of the present invention is made of by measuring cutting back and ultrasonic measurement unit two parts ultrasonic transducer.Measure the cutting back of cutting back for no straight length, it comprises flange 1, stagnation chamber 2, ultrasonic transducer seat 3, current regulator 5.Flange 1 is fixedlyed connected with an end in stagnation chamber 2 and is integral, and current regulator 5 is fixedly installed in the stagnation chamber 2, and the front end of current regulator 5 is an inclined-plane ultrasonic reflections plate, and the end is oval thereafter, to reduce the resistance to gas flow.At the portion position of sound wave baffle-board, the both sides up and down of vertical survey cutting back are provided with ultrasonic transducer seat 3, and ultrasonic transducer 4 is fixedly mounted in the ultrasonic transducer seat 3, are measuring section 6 between two stagnation chambeies 2, and the internal diameter of measuring section 6 is less than the internal diameter in stagnation chamber 2.
Ultrasonic measurement of the present invention unit is by single-chip microcomputer, broadband emission/receiving element, and the automatic amplitude control module of signal dynamics, amplifier, the zero level signal checking unit, timing circuit, timing gate cell and ultrahigh frequency, high stable markers unit are connected and composed by circuit.The ultrasonic measurement unit is connected with ultrasonic transducer, by ultrasonic transducer gas is measured, broadband emission/receiving element transmits and receives signal, and by the automatic amplitude control module of signal dynamics, received ultrasonic signal amplitude is controlled in the amplitude range of regulation, through high stable, the zero level detecting signal unit is sent in the signal amplifier unit of high-gain, detect the received signal of Zero crossing level, be equipped with 〉=the high markers of 100MHz by the timing gate cell again, the time of the sonic propagation of measuring, average after repeatedly measuring, make the measuring accuracy of gamut reach 0.5 grade, range ratio is better than 80: 1, has reached the requirement of high-acruracy survey.
Claims (2)
1. mesolow small-bore gas flowmeter body, constitute by ultrasonic measurement cutting back and ultrasonic measurement unit two parts, it is characterized in that: flange (1) is fixedlyed connected with an end of stagnation chamber (2) and is integral, current regulator (5) is fixedly installed in the stagnation chamber (2), the front end of current regulator (5) is an inclined-plane ultrasonic reflections plate, thereafter the end is oval, ultrasonic transducer seat (3) is vertically set on the both sides up and down at the ultrasonic measurement cutting back of ultrasonic reflections board position, current regulator (5) front end inclined-plane, ultrasonic transducer (4) is fixedly mounted in the ultrasonic transducer seat (3), between two stagnation chambeies (2), be measuring section (6), the internal diameter of measuring section (6) is less than the internal diameter of stagnation chamber (2), ultrasonic transducer (4) and the internal diameter of diameter measurement section (6) suitable; The high-precision ultrasound measuring unit is by single-chip microcomputer, broadband emission/receiving element, the automatic amplitude control module of signal dynamics, amplifier, the zero level signal checking unit, timing circuit, timing gate cell and ultrahigh frequency, high stable markers unit are connected and composed by circuit, and the high-precision ultrasound measuring unit is connected with ultrasonic transducer (4).
2. gas meter according to claim 1 is characterized in that: wherein the timing gate cell in the high-precision ultrasound measuring unit is equipped with 〉=the high markers of 100MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010298742 CN102003984A (en) | 2010-09-30 | 2010-09-30 | Middle-low pressure gas flowmeter with small caliber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010298742 CN102003984A (en) | 2010-09-30 | 2010-09-30 | Middle-low pressure gas flowmeter with small caliber |
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| CN102003984A true CN102003984A (en) | 2011-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010298742 Pending CN102003984A (en) | 2010-09-30 | 2010-09-30 | Middle-low pressure gas flowmeter with small caliber |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983312A (en) * | 2014-06-03 | 2014-08-13 | 威海市天罡仪表股份有限公司 | Bullet type flow stabilizer |
| CN105403264A (en) * | 2015-11-12 | 2016-03-16 | 重庆前卫克罗姆表业有限责任公司 | Channel in ultrasonic flowmeter |
| CN107490411A (en) * | 2017-08-24 | 2017-12-19 | 天津赛恩能源技术股份有限公司 | A kind of ultrasonic measurement pipe segment structure for ultrasonic flowmeter |
| CN107505016A (en) * | 2017-09-13 | 2017-12-22 | 湖北锐意自控系统有限公司 | Measurement of gas flow air chamber and gas flowmeter scale |
| CN114323174A (en) * | 2021-11-25 | 2022-04-12 | 山东大卫国际建筑设计有限公司 | Ultrasonic flowmeter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2259619Y (en) * | 1995-10-13 | 1997-08-13 | 同济大学 | Ultrasonic velocity difference flow meter |
| EP0897101A1 (en) * | 1997-08-14 | 1999-02-17 | Electrowatt Technology Innovation AG | Ultrasonic flowmeter |
| DE10240975A1 (en) * | 2002-09-02 | 2004-03-18 | Hydrometer Gmbh | Ultrasonic flowmeter has at least one flow-shaping insert at the inlet to the measurement length with both a flow divider and an eddy-generating element so that flow inhomogeneities caused by transducers are balanced out |
| JP2005338055A (en) * | 2004-04-27 | 2005-12-08 | Aichi Tokei Denki Co Ltd | Ultrasonic flowmeter |
| CN101365927A (en) * | 2005-12-06 | 2009-02-11 | 迪格梅萨股份公司 | Ultrasound measuring section made from plastic and corresponding measuring method |
-
2010
- 2010-09-30 CN CN 201010298742 patent/CN102003984A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2259619Y (en) * | 1995-10-13 | 1997-08-13 | 同济大学 | Ultrasonic velocity difference flow meter |
| EP0897101A1 (en) * | 1997-08-14 | 1999-02-17 | Electrowatt Technology Innovation AG | Ultrasonic flowmeter |
| DE10240975A1 (en) * | 2002-09-02 | 2004-03-18 | Hydrometer Gmbh | Ultrasonic flowmeter has at least one flow-shaping insert at the inlet to the measurement length with both a flow divider and an eddy-generating element so that flow inhomogeneities caused by transducers are balanced out |
| JP2005338055A (en) * | 2004-04-27 | 2005-12-08 | Aichi Tokei Denki Co Ltd | Ultrasonic flowmeter |
| CN101365927A (en) * | 2005-12-06 | 2009-02-11 | 迪格梅萨股份公司 | Ultrasound measuring section made from plastic and corresponding measuring method |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983312A (en) * | 2014-06-03 | 2014-08-13 | 威海市天罡仪表股份有限公司 | Bullet type flow stabilizer |
| CN103983312B (en) * | 2014-06-03 | 2017-07-28 | 威海市天罡仪表股份有限公司 | Bullet-nose flow straightener |
| CN105403264A (en) * | 2015-11-12 | 2016-03-16 | 重庆前卫克罗姆表业有限责任公司 | Channel in ultrasonic flowmeter |
| CN105403264B (en) * | 2015-11-12 | 2019-05-07 | 重庆前卫克罗姆表业有限责任公司 | Runner in ultrasonic flowmeter |
| CN107490411A (en) * | 2017-08-24 | 2017-12-19 | 天津赛恩能源技术股份有限公司 | A kind of ultrasonic measurement pipe segment structure for ultrasonic flowmeter |
| CN107490411B (en) * | 2017-08-24 | 2023-07-25 | 天津赛恩能源技术股份有限公司 | Ultrasonic measurement pipe section structure for ultrasonic flowmeter |
| CN107505016A (en) * | 2017-09-13 | 2017-12-22 | 湖北锐意自控系统有限公司 | Measurement of gas flow air chamber and gas flowmeter scale |
| WO2019052182A1 (en) * | 2017-09-13 | 2019-03-21 | 湖北锐意自控系统有限公司 | Gas flow metering gas chamber and gas flow meter |
| EP3683553A4 (en) * | 2017-09-13 | 2021-06-16 | Hubei Cubic-ruiyi Instrument Co., Ltd | Gas flow metering gas chamber and gas flow meter |
| CN107505016B (en) * | 2017-09-13 | 2022-02-08 | 湖北锐意自控系统有限公司 | Gas flow metering gas chamber and gas flow meter |
| CN114323174A (en) * | 2021-11-25 | 2022-04-12 | 山东大卫国际建筑设计有限公司 | Ultrasonic flowmeter |
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Application publication date: 20110406 |