CN102435236B - Flow meter of perforated plate - Google Patents
Flow meter of perforated plate Download PDFInfo
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- CN102435236B CN102435236B CN 201110344567 CN201110344567A CN102435236B CN 102435236 B CN102435236 B CN 102435236B CN 201110344567 CN201110344567 CN 201110344567 CN 201110344567 A CN201110344567 A CN 201110344567A CN 102435236 B CN102435236 B CN 102435236B
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Abstract
The invention provides a flow meter of a perforated plate, which comprises the perforated plate and the flow meter. A substrate of the perforated plate is in a circular shape. The perforation rate f the perforated plate ranges from 10% to 60%. The substrate has three categories with uneven hole structures. A large circular hole is arranged at the centre position of a preferential substrate, a plurality of small circular holes are evenly distributed on the other positions of the substrate, the small circular holes arranged on the outmost periphery intersect with the periphery of the substrate to form non-complete circular holes. The diameter of the large circular hole is two to ten times of the diameter of the small circular holes. The flower meter can be chosen from three categories: 1 a direct-reading type pipe chute differential-pressure flow meter, 2 an indirect reading flow meter connected with a secondary meter through a differential-pressure sensor and 3 an indirect reading flow meter connected with a secondary meter through a differential-pressure switch and a differential-pressure sensor. The flow meter is small in volume, convenient to install, high in measurement accuracy, small in flow resistance of fluid, less in liquid accumulation in a pipeline and especially suitable for measuring flow of vapor, combustible fluid, explosive fluid, corruptible fluid and dirty fluid.
Description
Technical field
The present invention relates to the measurement mechanism of fluid flow in the pipeline, the flowmeter that is espespecially consisted of by porous plate.
Background technology
The flow measurement of fluid need to be adopted flowmeter in the pipeline of laying on the fluid engineering, and flow is in respect of suspended body flowmeter, orifice plate (single hole orifice plate) flowmeter, Venturi flowmeter usually.These flows have valuation lattice height, volume is large, and the resistance of convection cell is large, measuring accuracy is not high or the shortcomings such as inconvenient are installed.Especially in the time need to carrying out on-line monitoring to the flow of numerous pipelines, on-the-spot limited space, normal so that existing flowmeter can't be installed and used.
The patent No. is that 200910176227.0 patent specification discloses a kind of " flowmeter and volume control device ", this flowmeter comprises: the 1st porous plate, the 1st porous plate is configured in the 1st bend of stream, and disposes obliquely with respect to the bearing of trend of the stream before and after the 1st bend; And flow sensor, the flow velocity of the measured fluid of stream is crossed in convection current.The purpose that this flowmeter has crooked position is to reduce the pipeline hydrops, and is more useful than the single orifice plate flowmeter of installing on the straight pipeline, but this apparatus structure is too complicated, easily causes line pressure to descend, and flow efficiency reduces.
Common porous plate is to have the identical aperture that is evenly distributed of a lot of diameters at a plate, it is when improving the large shortcoming of single orifice plate resistance, still there is other problem: the fluctuation of high-pressure area fluid, the flow field of low-pressure area is disorderly, cause signal fluctuation, make a big impact for the stability of measuring; Porous plate is opened a lot of holes at a plate, although can the reduce fluid height of circulation, but it can not be in edge perforate all around, fluid can not be all by multi-hole orifice (single orifice plate also has this shortcoming), making has fluid to retain alluvial in the pipeline, the parts of giving maintenance and changing on the pipeline bring very large inconvenience, and this must limit its use on the multiple fluid medium, especially inflammable, explosive, poisonous, corrosivity, dirty fluid media (medium).
2005, " the flow measurement device design manual " that Chemical Industry Press publishes, the paper " experimental study of porous plate flow measurement " of the 31st volume the 2nd phase " Nuclear Power Engineering " publication of publishing in April, 2010, and in three pieces of documents such as " based on the perforated plate construction design value research of homogenization method " of the volume publication of " steel construction " 2006 the 5th phase the 21st, aperture, percentage of open area and resistance coefficient, the pressure loss of porous plate, relation and the experimental formula between the flow have been introduced respectively.But do not provide the non-homogeneous porous plate that melts pore structure in these open source literatures.To adopt structure and shape that the more diverse non-homogeneous porous plate that melts pore structure is arranged among the present invention, but real mathematical relation between each aperture, hole, percentage of open area, resistance coefficient, pressure drop and the flowmeter registration of the perforated plate construction that makes new advances by above-mentioned known technology also reasoning and calculation.
Summary of the invention
Goal of the invention: overcome the various defectives of traditional single orifice plate and common flow meter of perforated plate, provide to have the non-homogeneous porous plate that melts pore structure, and various type of attachment, so that the flowmeter that measuring accuracy improves, the pipeline hydrops reduces.
Technical scheme: for realizing purpose of the present invention, the flow meter of perforated plate of employing contains porous plate and flowmeter; Porous plate is made of the flange plate of being convenient to be connected with pipeline of the substrate with a plurality of holes and the substrate peripheral that is connected, and flowmeter is connected with two testing tubes, can distinguish the pipeline of both sides, connected porous plate front and back.
The diameter of described substrate (equates with the internal diameter of described pipeline is basic identical, perhaps allow to be no more than the error of following small sircle hole diameter), the percentage of open area of hole on the substrate ratio of area of pertusate area sum and substrate () is 10%-60%.Substrate is three and non-homogeneously melts a kind of in the pore structure kind: 1. the centre of substrate has a big hole, other positions of substrate several small sircle holes that diameter is identical of evenly arranging; 2. evenly be placed with several the small sircle holes that diameter is identical on the substrate, be rendered as non-full-round hole but the periphery of the small sircle hole of outermost and substrate intersects; 3. substrate center has a big hole, and other positions of substrate several small sircle holes that diameter is identical of evenly arranging are rendered as non-full-round hole but the periphery of the small sircle hole of outermost and substrate intersects.
Flow is counted a kind of in three kinds: 1. direct-reading inclined tube differential pressure flowmeter; 2. the indrect reading flowmeter that is linked together by differential pressure pick-up and secondary instrument; 3. the indrect reading flowmeter that is linked together by differential pressure sampling transfer valve (or claiming differential pressure switch), differential pressure pick-up and secondary instrument.
Different substrate kinds, different big hole diameters, different small sircle hole diameter, different non-full circle area, different the percentage of open area ratio of pertusate area and substrate area (on the porous plate), porous plate has different resistance coefficients, having determined has different quantitative relation formulas between the flow of fluid in data that flowmeter shows and the pipeline, this relational expression is design and calculative determination in advance, by detecting the differential static pressure of porous plate front and back, can converse easily the size of flow value during use.
Among the present invention, when described flow was counted the first, numerical value on-line measurement direct-reading was simple and easy to use; The second changes pressure reduction into voltage or current signal, has supporting secondary instrument to show again, is convenient to realize the remote online measurement; The third secondary instrument requires low, can reduce the support expense of secondary instrument.
The shape of described substrate generally is circular slab, also can be elliptical flat-plate or polygonal panel, adapts with cross-section of pipeline shape to be measured.
The diameter of described small sircle hole is 2mm-10mm, and described substrate adopts the 1. to plant or the when 3. planting, described big hole diameter is 2 times-10 times of small sircle hole diameter.
When the diameter of described small sircle hole was 2mm, corresponding percentage of open area was 10%-30%; When the diameter of small sircle hole was 3mm, corresponding percentage of open area was 20%-40%; When the diameter of small sircle hole was 4mm, corresponding percentage of open area was 30%-50%; When the diameter of small sircle hole was 6mm, corresponding percentage of open area was 50%-60%.
Described substrate is the 1. to plant and the when 3. planting, porous plate has the advantage of single orifice plate and common porous plate concurrently, and resistance to flow is little, and the stream of the fluid of both sides is often uniform and stable before and after the porous plate, will be so that measurement registration and actual value are more approaching.
Described substrate adopts the 2. to plant or the when 3. planting, when porous plate is installed in pipeline, the center of circle of a non-full-round hole is arranged under pipeline center, guarantee that ducted hydrops can flow through entirely, greatly reduces without hydrops or hydrops in the pipeline from the cavity of this non-full circle.
During installation, described porous plate can be fastened in the pipeline by the flange plate of flange or sleeve pipe and porous plate.
Beneficial effect: flowmeter volume of the present invention is little, it is little to take up room, and moderate cost is easy to install, can on-line measurement, measuring accuracy is high.Improve the large shortcoming of single orifice plate resistance, improved the shortcoming of common porous plate flow field disorder, and a plurality of circular holes, the especially big hole of porous plate and the combination of small sircle hole, so that fluid flow fields is evenly distributed, eddy current is little, the fluid flow dynamic resistance is less.Non-full-round hole is left at edge around the substrate, bottom in pipeline can not form hydrops, when device is stopped work, fluid can all pass through porous plate, the parts of giving maintenance and changing on the pipeline bring great convenience, thereby this flow meter of perforated plate is applicable to measure the kinds of processes fluid, especially is fit to the use of inflammable and explosive, poisonous, corrosivity, dirty fluid.
Description of drawings
1. Fig. 1 plants a front elevation of porous plate;
2. Fig. 2 plants a front elevation of porous plate;
3. Fig. 3 plants a front elevation of porous plate;
Fig. 4 is first mounting structure synoptic diagram that the present invention is connected in pipeline;
Fig. 5 is second mounting structure synoptic diagram that the present invention is connected in pipeline;
Fig. 6 is the 3rd the mounting structure synoptic diagram that the present invention is connected in pipeline.
Among the figure, 1, flange plate; 2, substrate; 3, big hole; 4, small sircle hole; 5, non-full-round hole; 6, pipeline; 7, testing tube; 8, direct-reading inclined tube differential pressure flowmeter; 9, differential pressure pick-up; 10, secondary instrument; 11, differential pressure switch.
Embodiment
Below, in conjunction with the accompanying drawings and embodiments the present invention is made more specific description.
Shown in accompanying drawing 1, accompanying drawing 4, the equal diameters of the diameter of described circular slab substrate 2 and described pipeline 6, the percentage of open area of hole is 20% on the substrate 2; Substrate 2 is the 1. to plant: the centre of substrate 2 has a big hole 3, other positions of substrate 2 several small sircle holes 4 of evenly arranging, and the diameter of small sircle hole 4 is 2mm, big hole 3 diameters are 3 times of small sircle hole 4 diameters.Flow is counted the and is 1. planted: direct-reading inclined tube differential pressure flowmeter 8.The flange plate 1 of described porous plate is fixedly connected in the pipeline 6 by pipe flange.
Shown in accompanying drawing 2, accompanying drawing 5, the equal diameters of the diameter of described substrate 2 and described pipeline 6, the percentage of open area of hole is 30% on the substrate 2; Substrate 2 is the 2. to plant: evenly be placed with the small sircle hole 4 of several same diameter on the substrate 2, the diameter of small sircle hole 4 is 3mm, is rendered as non-full-round hole 5 but the periphery of the small sircle hole of outermost 4 and substrate 2 intersects; Flow is counted the and is 2. planted: the indrect reading flowmeter that is linked together by differential pressure pick-up 9 and secondary instrument 10.Described porous plate is fixedly connected in the pipeline 6 by sleeve pipe.When porous plate is installed, the center of circle of a non-full-round hole 5 is arranged under pipeline center in pipeline 6.
Shown in accompanying drawing 3, accompanying drawing 6, the diameter of the circular substrate 2 of described porous plate is a bit larger tham the diameter of pipeline 6, and its error is less than the diameter of small sircle hole 4; The percentage of open area of hole is 45% on the substrate 2; Substrate 2 is the 3. kind, substrate 2 centers have a big hole 3, other positions of substrate 2 several small sircle holes 4 of evenly arranging, the diameter of small sircle hole 4 is 4mm, but the periphery of the small sircle hole of outermost 4 and substrate 2 intersects and is rendered as non-full-round hole 5, and big hole 3 diameters are 5 times of small sircle hole 4 diameters; Flow is counted the and is 3. planted: connect the 10 indrect reading flowmeters that are connected together by differential pressure switch 11, differential pressure pick-up 9 with secondary instrument.Described porous plate is fixedly connected in the pipeline 6 by welding method.When porous plate is installed, the center of circle of a non-full-round hole 5 is arranged under the plectane center of circle (being pipeline center) in pipeline 6.
When the flow meter of perforated plate among above-described embodiment 1-3 uses, porous plate is connected in the pipeline, flowmeter is connected on the pipeline 6 of both sides, porous plate front and back by two testing tubes 7, the flow of fluid in the real-time measuring channel 6, this flowmeter volume is little, low to the measurement space requirement, can measure in real time, and measuring accuracy is high.
Among the embodiment 2,3, because there is non-full-round hole 5 in the outermost of the substrate 2 of porous plate, the liquid that pipeline is 6 li can flow through smoothly in the porous plate both sides, and 6 li in pipeline forms hydrops, safe ready during maintenance hardly.
Claims (6)
1. a flow meter of perforated plate is used for being connected to the upward flow of measuring channel fluid of pipeline (6), contains porous plate and flowmeter; Porous plate is made of the substrate with a plurality of holes (2) and the peripheral flange plate (1) of being convenient to be connected with pipeline (6) of the substrate that is connected (2), and flowmeter is connected with two testing tubes (7), can distinguish the pipeline (6) of both sides, connected porous plate front and back; It is characterized in that:
Substrate (2) is three and has a kind of in the non-homogeneous kind that melts pore structure: 1. the centre of substrate (2) has a big hole (3), other positions of substrate (2) several small sircle holes (4) that diameter is identical of evenly arranging; 2. evenly be placed with several the small sircle holes (4) that diameter is identical on the substrate (2), be rendered as non-full-round hole (5) but the periphery of the small sircle hole of outermost (4) and substrate (2) intersects; 3. substrate (2) center has a big hole (3), and other positions of substrate several small sircle holes (4) that diameter is identical of evenly arranging are rendered as non-full-round hole (5) but the periphery of the small sircle hole of outermost (4) and substrate (2) intersects;
The internal diameter of the diameter of described substrate (2) and described pipeline (6) is basic identical, and the percentage of open area of the upper hole of substrate (2) is 10%-60%: when the diameter of small sircle hole (4) was 2mm, corresponding percentage of open area was 10%-30%; When the diameter of small sircle hole (4) was 3mm, corresponding percentage of open area was 20%-40%; When the diameter of small sircle hole (4) was 4mm, corresponding percentage of open area was 30%-50%; When the diameter of small sircle hole (4) was 6mm, corresponding percentage of open area was 50%-60%;
Flow is counted a kind of in three kinds: 1. direct-reading inclined tube differential pressure flowmeter (8); 2. the indrect reading flowmeter that is linked together by differential pressure pick-up (9) and secondary instrument (10); 3. the indrect reading flowmeter that is linked together by differential pressure switch (11), differential pressure pick-up (9) and secondary instrument (10).
2. flow meter of perforated plate according to claim 1 is characterized in that: the shape of described substrate (2) is circular.
3. flow meter of perforated plate according to claim 1, it is characterized in that: the diameter of described small sircle hole (4) is 2mm-10mm, the diameter of described big hole (3) is 2 times-10 times of small sircle hole (4) diameter.
4. according to claim 1 or 3 described flow meter of perforated plates, it is characterized in that: when the diameter of described small sircle hole (4) was 2mm, corresponding percentage of open area was 20%; When the diameter of small sircle hole (4) was 3mm, corresponding percentage of open area was 30%; When the diameter of small sircle hole (4) was 4mm, corresponding percentage of open area was 45%; When the diameter of small sircle hole (4) was 6mm, corresponding percentage of open area was 60%.
5. flow meter of perforated plate according to claim 1 is characterized in that: described substrate (2) adopts the 2. to plant or the when 3. planting, when porous plate is installed, the center of circle of a non-full-round hole (5) is arranged under pipeline (6) center in pipeline (6).
6. flow meter of perforated plate according to claim 1 or 5, it is characterized in that: during installation, described porous plate is fastened in the pipeline (6) by the flange plate (1) of flange or sleeve pipe and porous plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110344567 CN102435236B (en) | 2011-11-04 | 2011-11-04 | Flow meter of perforated plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110344567 CN102435236B (en) | 2011-11-04 | 2011-11-04 | Flow meter of perforated plate |
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| CN102435236A CN102435236A (en) | 2012-05-02 |
| CN102435236B true CN102435236B (en) | 2013-02-13 |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103048021A (en) * | 2012-12-21 | 2013-04-17 | 上海华强浮罗仪表有限公司 | Steam integral balance flow meter |
| CN103070686B (en) * | 2012-12-25 | 2015-05-06 | 合肥博谐电子科技有限公司 | Device and method for measuring human body breathing mechanics parameter on basis of double differential-pressure sensors |
| CN103245382A (en) * | 2013-05-22 | 2013-08-14 | 江阴中南重工股份有限公司 | Adjustable flange type flow measurement device |
| CN103344286A (en) * | 2013-06-28 | 2013-10-09 | 上海华强浮罗仪表有限公司 | Double-flange balance flow meter |
| CN104792374B (en) * | 2015-03-31 | 2018-02-06 | 辽宁毕托巴科技有限公司 | A kind of antifreeze differential pressure flowmeter |
| CN105021237A (en) * | 2015-08-12 | 2015-11-04 | 成都国光电子仪表有限责任公司 | Pressure tapping pipe section suitable for measuring condensate natural gas pipeline |
| CN105021238A (en) * | 2015-08-12 | 2015-11-04 | 成都国光电子仪表有限责任公司 | Throttle mechanism high in interchangeability |
| CN105067051A (en) * | 2015-08-17 | 2015-11-18 | 成都国光电子仪表有限责任公司 | Throttling device of orifice plate flowmeter |
| CN105136227A (en) * | 2015-08-17 | 2015-12-09 | 成都国光电子仪表有限责任公司 | Differential-pressure amplifying mechanism capable of preventing precipitation liquid against enrichment |
| CN105004392A (en) * | 2015-08-17 | 2015-10-28 | 成都国光电子仪表有限责任公司 | Flowmeter throttling part beneficial for measurement accuracy |
| CN106525159A (en) * | 2016-11-10 | 2017-03-22 | 太原市普瑞兴生仪表有限公司 | Air flow measurement device |
| CN108225449A (en) * | 2016-12-14 | 2018-06-29 | 国家电投集团科学技术研究院有限公司 | There is the throttling set blocked, resistance regulation and flow pattern adjust |
| CN107402049A (en) * | 2017-08-31 | 2017-11-28 | 苏鸿远 | One kind dismounts easily flowmeter |
| WO2019161716A1 (en) | 2018-02-23 | 2019-08-29 | 南京亿准纳自动化控制技术有限公司 | Throttling component and rectification and flow measurement device |
| CN113156050A (en) * | 2021-05-12 | 2021-07-23 | 中国烟草总公司郑州烟草研究院 | System and method for evaluating cigar rolling uniformity |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006001417A1 (en) * | 2006-01-10 | 2007-07-12 | Endress + Hauser Flowtec Ag | Device for deflecting a medium flowing in a pipeline |
| CN101046402A (en) * | 2006-03-31 | 2007-10-03 | 胡伯弓 | Constant-value mass flow meter |
| CN101639374A (en) * | 2009-08-26 | 2010-02-03 | 姚贤卿 | Multiphase flow rectifying device |
| CN201514247U (en) * | 2009-10-14 | 2010-06-23 | 西北工业大学 | Gas-liquid multi-phase flow measuring device |
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