CN104251724A - Fluid flow measuring apparatus - Google Patents
Fluid flow measuring apparatus Download PDFInfo
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- CN104251724A CN104251724A CN201410496456.1A CN201410496456A CN104251724A CN 104251724 A CN104251724 A CN 104251724A CN 201410496456 A CN201410496456 A CN 201410496456A CN 104251724 A CN104251724 A CN 104251724A
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Abstract
The invention discloses a fluid flow measuring apparatus and belongs to the technical field of fluid measurement. The fluid flow measuring apparatus comprises a Venturi flowmeter throttling element (1) and an ultrasonic flowmeter sensor (2), wherein the ultrasonic flowmeter sensor (2) is arranged on a cylindrical throat (C) of the Venturi flowmeter throttling element (1). The measurement range ratio of the flow measuring apparatus reaches 500-1000 times, precision is within 1%, and the technical problem that an existing flowmeter is low measuring range ratio and low in precision is solved. The fluid flow measuring apparatus is particularly applicable to flow measurement occasions such as community main meters, large-scale enterprise main meters, area metering and city pipe network monitoring with high requirement on the measurement range ratio.
Description
Technical field
The present invention relates to a kind of fluid flow rate measurement apparatus, belong to fluid flux measurement technology field.
Background technology
Because the security monitoring in the trade settlement demand of the exploitation of clean energy resource and widespread use, clean energy resource and clean energy resource pipe network transmitting procedure has expedited the emergence of the active demand to Mass Flow Meter.It require flowmeter can for a long time, safety, stable, trouble-freely run.In the market for flow measurement instrument and principle of work as follows:
1. gas turbine meter
Promote turbo blade when fluid enters pipeline, blade and fluid moving direction are angled, and start to rotate after blade overcome friction and fluid resistance, in certain flow range, the angular velocity of turbine rotation is directly proportional to fluid volume flow.
2. precession spiral flowmeter
In pipeline, a conical rotating body is installed in center.When fluid by time can produce whirlpool, vortical flow clash into pressure transducer produce pulse signal, the flow velocity of fluid is directly proportional to pulsed frequency.
3. vortex shedding flow meter
Trapezoidal stop module is inserted, when the trapezoidal stop module of airflow passes in airflow line, module both sides alternately produce to vacillate downwards dynamic air flow swirl with air-flow, each air flow swirl through pressure transducer clash into pressure transducer produce pulse signal frequency be directly proportional to flow velocity.
4. Roots type flowmeter
Also rotz flowmeter is claimed.In flowmeter shell, have the measuring room of a fixed volume, indoor have and can relatively rotate for a pair, and intermeshing waist wheel, gear.When fluid is by measuring room, the dynamic pressure of fluid makes import and export mineralization pressure difference and promotes the rotation of waist wheel, and waist wheeling driving gear often rotates one-period, is fixing by the fluid flow of measuring room.Roots type flowmeter utilizes mechanical measurement element continuously will be divided into multiple known volume part by fluid.Successively repeat according to measuring room to be full of the total amount carrying out measuring flow volume with discharge process.
5. differential pressure flowmeter
Differential pressure flowmeter generally adopts orifice plate, nozzle or venturi tube structure.Its principle is fluid can produce static difference pressure between upstream and downstream after structure barrier.Device as measuring apparatus and GB GB/T 2624 defined has geometric similarity, and service condition is identical, then substitute into formula determination flow value according to the geometric data of the measured value of static difference pressure, fluid behaviour environmental data and measuring apparatus.Differential pressure flowmeter is due to the defect of measuring principle, a limited field is had to the flow state of flow, particularly low reynolds number (<5000) situation lower survey precision be difficult to ensure, particularly even cannot sense signal during low discharge, this is the developmental main weakness of differential pressure flowmeter.
6. ultrasonic flowmeter
Ultrasonic flowmeter has a pair ultrasonic transducer relative and in a certain angle with pipe centerline on tube wall, wherein any one ultrasonic transducer ultrasonic wave energy of launching receive by another.Because fluid flows causes ultrasound wave transmission t1, t2 mistiming in both direction can calculate fluid velocity and flow after sending according to ultrasound wave.Ultrasonic flowmeter is due to the reason of measuring principle, very easily be interfered and flow signal detection is made mistakes, particularly (be about greater than 30 meter per seconds) when velocity of medium height, the noise that fluid self produces can destroy or disturb normal ultrasonic signal, causes measuring.
The flow range that existing various flow measurement technology can detect is less.The maximum flow that can detect except Roots type flowmeter and minimum flow range ratio can reach except 50 ~ 100 times, are generally all less than 10 times, cannot meet the demand of urban pipe network monitoring and many trade settlement aspects.
In order to improve the sensing range of flowmeter, the measurement that existing flowmeter adopts the mode of two flow meter to realize compared with wide-range usually, such as Chinese patent literature CN102183274B discloses a kind of wide-range double-vortex flowmeter, it comprises the ultrasonography vortex street flow sensor being located at measuring tube upstream and the stress vortex flow sensors being located at measuring tube downstream, this application have employed two kinds of different vortex flow sensors, and carry out switching control by flow converter, achieve the detection of gas flow rate of wide region, and the range ratio of this flowmeter is maximum can only reach 150:1.For the demand requiring the monitoring of the urban pipe network of greater amount journey ratio and many trade settlement aspects, this eddy currents flowmeter then cannot realize.
Summary of the invention
For this reason, technical matters to be solved by this invention is that the range ratio of existing flowmeter is lower, precision is not high enough, and then provides a kind of precision higher, and the flow measurement device that range ratio is higher.
For solving the problems of the technologies described above, a kind of fluid flow rate measurement apparatus of the present invention, comprises differential pressure type flowmeter throttling element, and is arranged at the ultrasonic flowmeter sensor on the cylindrical throat of described differential pressure type flowmeter throttling element.
In above-mentioned fluid flow rate measurement apparatus, the length of the inlet cylinders section of described differential pressure type flowmeter throttling element and its equal diameters, the cone angle of circular cone contraction section is 20-22 °, the cone angle 7-15 ° of circular cone diffuser, and the length of described cylindrical throat is 1.3-1.7 times of its diameter.
In above-mentioned fluid flow rate measurement apparatus, the tube wall of described cylindrical throat is offered the mounting hole for the transmitting terminal and receiving end installing described ultrasonic flowmeter sensor, the transmitting terminal of described ultrasonic flowmeter sensor and receiving end insert described mounting hole and stretch to the inner chamber of described cylindrical throat.
In above-mentioned fluid flow rate measurement apparatus, the angle between described ultrasonic flowmeter sensor and described cylindrical throat is 30-60 °.Above-mentioned angle of the present invention refers to the angle between the axial connecting line of ultrasonic flowmeter sensor transmitting terminal and receiving end and the axis of described cylindrical throat.
In above-mentioned fluid flow rate measurement apparatus, preferably, the angle between described ultrasonic flowmeter sensor and described cylindrical throat is 45 °.
In above-mentioned fluid flow rate measurement apparatus, described inlet cylinders section arranges pressure transducer, and described cylindrical throat set temperature sensor, described inlet cylinders section and described cylindrical throat arrange differential pressure pick-up.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) flow measurement device of the present invention is by being arranged on the cylindrical throat of the differential pressure type flowmeter throttling element of improvement by ultrasonic flowmeter sensor, again differential pressure pick-up is set on throttling element cylindrical section A and cylindrical throat C simultaneously, flow measurement and calculating is carried out under electronic unit and computer software coordinate, ultrasonic flowmeter sensor is arranged in the throttling pipe with small pipe diameter section of differential pressure type flowmeter throttling element, this region is compression reducing district, according to the flow characteristics of fluid, the fluid flow fields in this region is uniform and stable, at this, ultrasonic flowmeter sensor is installed highly beneficial for the measurement of low flow velocity low discharge, greatly can improve accuracy of measurement and the stability of low discharge, avoid arranging in the upstream of differential pressure type flowmeter throttling element or downstream the interference that flow sensor brings differential pressure type flowmeter measurement simultaneously, the large discharge measuring accuracy of differential pressure type flowmeter is made to control in certain limit, ensure that the precision controlling of whole flowmeter 1% error range, two kinds of flow meter realize flow measurement device range ratio and reach 500-1000 doubly.When inlet cylinders section diameter is 200mm, when cylindrical throat diameter is 100mm, the minimum measurable flow amount of ultrasonic flow meter can reach 2m
3/ h, differential pressure type flowmeter throttling element maximum detection amount flow can reach 2000 m
3/ h, makes the range ratio of this fluid flow rate measurement apparatus reach 1000 times.
(2) inlet cylinders section A, the circular cone contraction section B of differential pressure type flowmeter throttling element of the present invention and the size conforms GB/T2624 of circular cone diffuser D, the length of cylindrical throat C is 1.3-1.7 times of this section of diameter, the Venturi tube of this dimension scale can make this flowmeter energy consumption when low-pressure is carried lower, is beneficial to the installation of ultrasonic sensor while ensureing differential pressure type flowmeter precision.
(3) the present invention can adopt contact ultrasonic flowmeter sensor, the i.e. inner chamber of the transmitting terminal of ultrasonic flowmeter sensor and the cylindrical throat of receiving end insertion Venturi tube, due to contact ultrasonic flowmeter highly sensitive, emissive power is little, signal great Yi process, further increase the measuring accuracy of flow measurement device, reduce intractability.
(4) angle between described ultrasonic flowmeter sensor of the present invention and described cylindrical throat is 30-60 °, and this setting angle has the advantage that better can ensure measuring accuracy under high flow rate, and processing, install more convenient.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the structural representation of fluid flow rate measurement apparatus of the present invention;
In figure, Reference numeral is expressed as: 1-differential pressure type flowmeter throttling element, 2-ultrasonic flowmeter sensor, A-inlet cylinders section, B-circular cone contraction section, D-circular cone diffuser, C-cylindrical throat.
Embodiment
Below with reference to accompanying drawing, following examples are used to be further elaborated the present invention.
Fig. 1 is fluid flow rate measurement apparatus disclosed by the invention, and it comprises differential pressure type flowmeter throttling element 1, and is arranged at the ultrasonic flowmeter sensor 2 on the cylindrical throat C of described differential pressure type flowmeter throttling element 1.Ultrasonic flowmeter sensor 2 is arranged at the restriction portion of described differential pressure type flowmeter throttling element 1, this region is compression reducing district, for measuring low discharge, according to the flow characteristics of fluid, the fluid flow fields in this region is uniform and stable, installs ultrasonic flowmeter sensor highly beneficial for the measurement of low flow velocity low discharge at this; The differential pressure pick-up that the inlet cylinders section A of differential pressure type flowmeter throttling element 1 and cylindrical throat C is arranged is then for measuring large discharge.This flow measurement device is at guarantee precision controlling under the prerequisite of the error range of 1%, and range ratio can reach 500-1000 doubly.Described differential pressure type flowmeter throttling element 1 is connected on same controller with the electronic unit of described ultrasonic flowmeter sensor 2, and is shown by display, realizes differential flow and measures.
It is more than core technology scheme of the present invention, particularly, in present embodiment, the length of the inlet cylinders section A of described differential pressure type flowmeter throttling element 1 and its equal diameters, the cone angle of circular cone contraction section B is 21 °, the cone angle of circular cone diffuser D is 10 °, and the length of described cylindrical throat C is 1.5 times of its diameter.I.e. inlet cylinders section A, the circular cone contraction section B of Venturi tube, the size conforms standard GB/T/T2624 of circular cone diffuser D section, the cylindrical throat C of differential pressure type flowmeter throttling element 1 lengthens and installs described ultrasonic flowmeter sensor 2, above-mentioned differential pressure type flowmeter throttling element can make this flowmeter energy consumption when low-pressure is carried lower, is beneficial to the installation of ultrasonic sensor while ensureing Venturi meter precision.
In order to improve the precision of flow measurement device further, in present embodiment, the tube wall of described cylindrical throat C is offered for installing the described transmitting terminal of ultrasonic flowmeter sensor 2 and the mounting hole of receiving end, the transmitting terminal of described ultrasonic flowmeter sensor 2 and receiving end insert described mounting hole and stretch to the inner chamber of described cylindrical throat C.Due to contact ultrasonic flowmeter highly sensitive, emissive power is little, signal great Yi process, the measuring accuracy of this flow measurement device can be made to improve, reduce intractability.
Angle between described ultrasonic flowmeter sensor sensor 2 and described cylindrical throat C is 30-60 °.In present embodiment, take into account ease of processing and measuring accuracy, the angle between described ultrasonic flowmeter sensor 2 and described cylindrical throat C is 45 °.
Described inlet cylinders section A arranges pressure transducer, described cylindrical throat C set temperature sensor, by measuring working pressure and the temperature of fluid, can compensate computing to pressure and temperature, improving the degree of accuracy of flow measurement.
Embodiment 2
The present embodiment is the malformation on the basis of fluid flow rate measurement apparatus in embodiment 1, its key distinction point is: in the present embodiment, the length of the inlet cylinders section A of described differential pressure type flowmeter throttling element 1 and its equal diameters, the cone angle of circular cone contraction section B is 22 °, the cone angle of circular cone diffuser D is 15 °, and the length of described cylindrical throat C is 1.7 times of its diameter.
Embodiment 3
The present embodiment is the malformation on the basis of fluid flow rate measurement apparatus in embodiment 1, its key distinction point is: the length of the inlet cylinders section A of described differential pressure type flowmeter throttling element 1 and its equal diameters, the cone angle of circular cone contraction section B is 21 °, the cone angle of circular cone diffuser D is 15 °, and the length of described cylindrical throat C is 1.3 times of its diameter.
In other embodiments, the structure of described differential pressure type flowmeter throttling element 1 can also be: the length of described inlet cylinders section A and its equal diameters, the cone angle of circular cone contraction section B is at 20-22 °, the cone angle of circular cone diffuser D is 7-15 °, and the length of described cylindrical throat C is 1.3-1.7 times of its diameter.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (6)
1. a fluid flow rate measurement apparatus, is characterized in that: comprise differential pressure type flowmeter throttling element (1), and is arranged at the ultrasonic flowmeter sensor (2) on the cylindrical throat (C) of described differential pressure type flowmeter throttling element (1).
2. fluid flow rate measurement apparatus according to claim 1, it is characterized in that: the length of the inlet cylinders section (A) of described differential pressure type flowmeter throttling element (1) and its equal diameters, the cone angle of circular cone contraction section (B) is 20-22 °, the cone angle of circular cone diffuser (D) is 7-15 °, and the length of described cylindrical throat (C) is 1.3-1.7 times of its diameter.
3. fluid flow rate measurement apparatus according to claim 1 and 2, it is characterized in that: the tube wall of described cylindrical throat (C) is offered the mounting hole for the transmitting terminal and receiving end installing described ultrasonic flowmeter sensor (2), the transmitting terminal of described ultrasonic flowmeter sensor (2) and receiving end insert described mounting hole and stretch to the inner chamber of described cylindrical throat (C).
4. fluid flow rate measurement apparatus according to claim 3, is characterized in that: the angle between described ultrasonic flowmeter sensor sensor (2) and described cylindrical throat (C) is 30-60 °.
5. fluid flow rate measurement apparatus according to claim 4, is characterized in that: the angle between described ultrasonic flowmeter sensor (2) and described cylindrical throat (C) is 45 °.
6. according to the arbitrary described fluid flow rate measurement apparatus of claim 2-5, it is characterized in that: described inlet cylinders section (A) arranges pressure transducer, described cylindrical throat (C) set temperature sensor, described inlet cylinders section (A) and described cylindrical throat (C) arrange differential pressure pick-up.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104763498A (en) * | 2015-03-05 | 2015-07-08 | 天纳克（苏州）排放系统有限公司 | Diesel engine nitrogen oxide after-treatment system, control method and application |
| CN105372446A (en) * | 2015-12-12 | 2016-03-02 | 中国航空工业集团公司西安飞机设计研究所 | Differential pressure type wind speed measuring sensor and detecting device with same |
| CN105403730A (en) * | 2015-11-13 | 2016-03-16 | 武汉大学 | Fluid instantaneous flow velocity measure apparatus and method based on Helmholtz instability |
| CN105403266A (en) * | 2015-12-16 | 2016-03-16 | 宁波水表股份有限公司 | Automatic correction large-caliber ultrasound water meter and correction method of same |
| CN105508234A (en) * | 2016-01-18 | 2016-04-20 | 中国联合工程公司 | Nuclear power main pump test device |
| CN105526978A (en) * | 2015-12-03 | 2016-04-27 | 中国科学院等离子体物理研究所 | Single-phase low-temperature fluid flow measuring device |
| CN105545281A (en) * | 2015-11-30 | 2016-05-04 | 中国石油天然气股份有限公司 | Gas throttling simulation device |
| CN106404079A (en) * | 2016-08-25 | 2017-02-15 | 中国石油天然气股份有限公司 | Compensation flow test method |
| CN107490406A (en) * | 2017-08-22 | 2017-12-19 | 上海诺仪表有限公司 | A kind of ultrasonic vortex street effusion meter |
| CN110285861A (en) * | 2019-06-23 | 2019-09-27 | 上海玮轩电子科技有限公司 | A kind of ultrasonic flowmeter |
| CN113405616A (en) * | 2021-06-16 | 2021-09-17 | 深圳市联恒星科技有限公司 | Multiphase flow fluid measurement system based on riser differential pressure |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104763498B (en) * | 2015-03-05 | 2017-06-23 | 天纳克（苏州）排放系统有限公司 | Diesel engine nitrogen oxides after-treatment system, control method and its application |
| CN104763498A (en) * | 2015-03-05 | 2015-07-08 | 天纳克（苏州）排放系统有限公司 | Diesel engine nitrogen oxide after-treatment system, control method and application |
| CN105403730A (en) * | 2015-11-13 | 2016-03-16 | 武汉大学 | Fluid instantaneous flow velocity measure apparatus and method based on Helmholtz instability |
| CN105403730B (en) * | 2015-11-13 | 2018-03-27 | 武汉大学 | Fluid instantaneous velocity measurement apparatus and method based on helmholtz instability |
| CN105545281A (en) * | 2015-11-30 | 2016-05-04 | 中国石油天然气股份有限公司 | Gas throttling simulation device |
| CN105526978A (en) * | 2015-12-03 | 2016-04-27 | 中国科学院等离子体物理研究所 | Single-phase low-temperature fluid flow measuring device |
| CN105372446A (en) * | 2015-12-12 | 2016-03-02 | 中国航空工业集团公司西安飞机设计研究所 | Differential pressure type wind speed measuring sensor and detecting device with same |
| CN105403266A (en) * | 2015-12-16 | 2016-03-16 | 宁波水表股份有限公司 | Automatic correction large-caliber ultrasound water meter and correction method of same |
| CN105403266B (en) * | 2015-12-16 | 2019-03-01 | 宁波水表股份有限公司 | A kind of heavy caliber Ultrasonic water meter automatically corrected and its bearing calibration |
| CN105508234A (en) * | 2016-01-18 | 2016-04-20 | 中国联合工程公司 | Nuclear power main pump test device |
| CN106404079A (en) * | 2016-08-25 | 2017-02-15 | 中国石油天然气股份有限公司 | Compensation flow test method |
| CN106404079B (en) * | 2016-08-25 | 2019-05-21 | 中国石油天然气股份有限公司 | Compensation flow test method |
| CN107490406A (en) * | 2017-08-22 | 2017-12-19 | 上海诺仪表有限公司 | A kind of ultrasonic vortex street effusion meter |
| CN110285861A (en) * | 2019-06-23 | 2019-09-27 | 上海玮轩电子科技有限公司 | A kind of ultrasonic flowmeter |
| CN113405616A (en) * | 2021-06-16 | 2021-09-17 | 深圳市联恒星科技有限公司 | Multiphase flow fluid measurement system based on riser differential pressure |
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Application publication date: 20141231 |