CN102840886A - Porous medium-based flow measuring device and implementation method thereof - Google Patents
Porous medium-based flow measuring device and implementation method thereof Download PDFInfo
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- CN102840886A CN102840886A CN2012103171760A CN201210317176A CN102840886A CN 102840886 A CN102840886 A CN 102840886A CN 2012103171760 A CN2012103171760 A CN 2012103171760A CN 201210317176 A CN201210317176 A CN 201210317176A CN 102840886 A CN102840886 A CN 102840886A
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Abstract
The invention discloses a porous medium-based flow measuring device, which comprises a cylindrical measuring tube, wherein two positioning filter screens are arranged in the measuring tube; small balls are stacked between the two positioning filter screens and are stacked into a multi-layer porous medium in the measuring tube; a side wall of the measuring tube is provided with two pressure measuring tubes; and the two pressure measuring tubes are positioned in a stacking region of the small balls. According to the porous medium-based flow measuring device, the small ball stacking structure is used as a porous medium structural unit; since the small ball stacking structure is a typical saturated ordered porous medium, and more research data and achievements aiming at fluid dynamics of the small ball stacking structure are achieved, the design and the calibration work of a flow meter are favorably guided, and the small ball manufacturing process is mature and lower in cost.
Description
Technical field
The present invention relates to a kind of flow measurement device, specifically be meant a kind of flow measurement device and its implementation based on porous medium.
Background technology
A restriction device is housed on the gas flow pipeline, an orifice plate is housed in it, the center has a circular hole; Its aperture is littler than internal diameter of the pipeline, and what combustion gas was stable before orifice plate flows forward, and when gas stream is crossed orifice plate because aperture diminishes; Sectional area shrinks, and steady flow condition is upset, thereby flow velocity will change; Speed up, the static pressure of gas decreases, so before and after orifice plate, produce pressure breakdown; Be differential pressure (the big local pressure in orifice plate starting section is big, and the local pressure little through the orifice plate cross section is little).The size of differential pressure and gas flow have definite numerical relation, and when promptly flow was big, differential pressure was just big, flow hour, and differential pressure is just little; Flow is directly proportional with the square root of differential pressure.Differential pressure flowmeter is that the physical dimension of known fluid condition and detection piece and pipeline is come the instrument of calculated flow rate according to the differential pressure that is installed on flow detection part generation in the pipeline.
Porous medium is a kind of material with special construction, and this material internal is studded with the less pore space of many sizes, and pore space is interconnected whole or in part, and the fluid of liquid phase or gas phase can flow through from the inside of this material.The specific surface area of solid skeletal is very big in the porous medium, hole is narrow, compares with common material or structure, aspect hydrodynamic characteristics, has some different features.
At present, the device that adopts porous structure to carry out flow measurement is both at home and abroad mainly selected porous plate for use, promptly on disk, has a plurality of through holes, and shape, number and the distribution mode of different invention mesopores are different.As application number be 201110344567.7, patent name is the flowmeter of " porous plate flowmeter "; The percentage of open area of porous plate is 10%-60%; The circular substrate centre has a big hole; Other positions of substrate several small sircle holes of evenly arranging, the small sircle hole of outermost and the periphery of substrate intersect and are rendered as non-full circle hole; And for example application number is 87212304, patent name is the patent of " streamlined section porous pitot tube flowmeter ", changes the porous pitot tube body of typical circular or diamond-shaped cross-section into the cross section gabarit and is fusiform body; And for example application number is that 201120277374.X, patent name are the patent of " porous current stabilization differential pressure flowmeter ", and it is the function hole of round dot symmetric offset spread that the throttling disk is provided with the disc centre.Foregoing invention is improved common orifice flowmeter, adopt porous structure, yet these structures is not typical porous medium, and the linearity under low flow condition is relatively poor, and the stable section length of front and back pressure is bigger, measures sensitivity and remains further to be improved.
Summary of the invention
The object of the present invention is to provide a kind of flow measurement device and its implementation, improve the linearity of measuring-signal under low flow condition, improve the sensitivity of measuring based on porous medium.
The object of the invention is realized through following technical proposals:
A kind of flow measurement device based on porous medium; The measuring tube that comprises column type; Two location filter screens are installed in measuring tube, and between two location filter screens, piling up has spherula, and spherula is piled into the porous medium of multilayer in measuring tube; Two piezometric tube are installed on the sidewall of measuring tube, and two piezometric tube are positioned at spherular build-up areas.It is cylindric that measuring tube is on the whole, and the outside is a column type, and inside is cavity structure, and two location filter screens are installed in measuring tube, between two location filter screens, piles up how empty medium, and fluid can pass through the location filter screen and enter in the porous medium; Porous medium adopts spherula to pile up according to the positive tetrahedron accumulation mode and forms, and offers porosely through diverse location on the measuring tube sidewall of medium at fluid, and piezometric tube is installed in the hole; It is that a kind of whole hole is interconnected, saturated orderly medium that spherula is piled up the porous medium that forms; Utilize fluid when flowing through this porous medium, take place energy loss cause pressure to descend and unit length on pressure drop amplitude and the flow that flows through porous medium satisfy this principle of Ergun relational expression, obtain pressure difference signal through differential pressure transmitter, obtain flow rate of fluid or flow according to pressure drop calculation then; With respect to traditional differential pressure flowmeter; When flow was less, stability was better, and the flow rate of fluid differential pressure is more stable; The differential pressure curve that forms is in the less interval of flow, and the linearity is better.
Said spherular sphere diameter is less than or equal to 1/3 of measuring tube diameter.Adopt spherular sphere diameter to be not more than the ratio of measuring tube diameter 1/3,, help improving the accuracy and the stability of measurement to reduce " wall effect " influence to flow characteristics.
The said spherular accumulation number of plies is at least 10 layers.Say that further packed structures can realize that at 1 ~ 2 layer of bead fully developed flow is moving quickly, but accuracy and stability in order to improve measurement take into account 3 ~ 4 accumulation horizons of the unstable section of outlet, accumulation horizon helps the layout of measuring point when being not less than 10 layers.
The distance of the location filter screen at said two piezometric tube and two ends on spherula is axial is not less than 1 times of spherular diameter.Filter screen causes the upstream and downstream disturbance easily, and packed structures can comparatively fast realize that at 1 ~ 2 layer of bead fully developed flow is moving, but accuracy and stability in order to improve measurement, measuring point is arranged suitably away from the perturbing area.
Said location filter screen is discoideus, and its end face is provided with through hole.Adopt discoideus location filter screen, be convenient to be provided with external thread and realize and being connected of pipe fitting that its end face is provided with through hole, is used for the mobile of fluid.
Said through hole is and is circular hole or bar hole.Further say, adopt circular hole aperture and the narrow gap length degree of bar hole, help the fixed pellet accumulation horizon less than 1/2 of bead sphere diameter.
The side of filter screen is provided with external thread in said location, and the measuring tube inwall is provided with and locatees the internal thread that the external thread of filter screen is complementary.Further say, adopt the mode that is threaded, be convenient to locate the dismounting of filter screen and the location of fixed pellet accumulation horizon.
The open end of the said piezometric tube formation inverted cone-shaped structure that caves inward.
A kind of flow-measuring method based on porous medium may further comprise the steps:
(A) the granular pattern porosint that utilizes spherula to be piled into;
(B) make detected fluid pass through the granular pattern porosint of step (A);
(C) two pressure taps are selected in the different location on the granular pattern porosint of detected fluid process, and the pressure signal of pressure tap is transferred to differential pressure transmitter, form the curve that satisfies the Ergun relational expression.
The present invention compared with prior art has following advantage and beneficial effect:
A kind of flow measurement device of 1 the present invention based on porous medium; Adopt the bead packed structures as the porous media structure unit; Because the bead packed structures is a kind of typical saturated ordered porous medium, and is more to fluid dynamic data of bead packed structures and achievement, helps instructing the design and the staking-out work of flowmeter; And the bead manufacturing process is ripe, and cost is lower;
A kind of flow measurement device of 2 the present invention based on porous medium; Because the pressure drop in the porous media structure is comparatively responsive to flow; And linear relationship is better when flow velocity is low, therefore has the advantage of good, the highly sensitive and measurement range broad of the low flow velocity linearity based on the flowmeter of this structure;
A kind of flow measurement device of 3 the present invention based on porous medium; Adopt the bead packed structures as the porous media structure unit; The location filter screen is used for fixing porous media structure, and the external thread structure of its side and measuring tube screw-internal thread fit have good compressing and positioning function; Guarantee measuring stability, and be convenient to field stripping;
A kind of flow measurement device based on porous medium of 4 the present invention adopts pressure reduction as flow measurement signal, and the pressure measurement joint pipe structure is simple, is easy to be connected with pulse tube, has excellent sealing property and the advantage that is easy to dismantle.
Description of drawings
Fig. 1 cuts structural representation for the present invention open along measuring the tube axis;
Fig. 2 locatees first kind of distribution schematic diagram of through hole on the filter screen for the present invention;
Fig. 3 locatees second kind of distribution schematic diagram of through hole on the filter screen for the present invention.
Mark and corresponding parts title in the accompanying drawing:
The 1-measuring tube, 2-locatees filter screen, 3-spherula, 4-piezometric tube, 5-through hole.
Embodiment
Below in conjunction with embodiment the present invention is done further detailed description, but embodiment of the present invention is not limited thereto.
Embodiment
Shown in Fig. 1 to 3, a kind of flow measurement device based on porous medium of the present invention comprises measuring tube 1, and measuring tube 1 integral body is cylindric, adopts the S321 stainless-steel tube to process, and basic specification is φ 14 * 2.0mm, length L 230mm; The outside wall surface at measuring tube 1 two ends is processed with the M14 external thread, is used for and being connected of threaded flange, and on measuring tube 1 inwall, all is processed with the internal thread of length 14mm apart from front end face and rear end face 84mm place, is used for and being connected of location filter screen 2; Location filter screen 2 is circular S321 corrosion resistant plate, and plectane external diameter 12mm, thickness are 8mm; The both ends of the surface of location filter screen 2 are processed with 7 bar holes, supply measured fluid to flow through, as the replacement form; Also can adopt circular hole to replace bar hole, the narrow gap length degree of circular hole aperture and bar hole is less than 1/2 of bead sphere diameter, and the side of location filter screen 2 is processed with external thread; With the screw-internal thread fit of measuring tube 1, can realize axial location; The spherula 3 that 79 φ 3.2 are installed between two location filter screens 2 constitutes the bead packed structures; Spherula 3 is approximate positive tetrahedron accumulation mode; In measuring tube 1, arranged 13 layers, piled up 7 or 5 spherulas 3 for every layer, alternately piled up; The spherula packed structures compresses the location by location filter screen 2, is fixed on the zone between two place's internal threads in the measuring tube 1; Piezometric tube 4 is the S321 stainless-steel tube, and basic specification is φ 6 * 1.5mm, is vertically welded in measuring tube 1 side, communicates with φ 2 straight holes of measuring tube 1, and centre distance is 15mm.The piezometric tube 4 endpiece outside is processed with external thread, is used for being threaded with pulse tube, is convenient to dismounting, is processed into inverted cone-shaped structure in piezometric tube 4 endpiece, is convenient to pad existing cone seal with red copper; The processing assembling sequence of flowmeter is boring on measuring tube 1 earlier; The piezometric tube that processes 4 is welded on the measuring tube 1 side assigned address, measuring tube 1 inside surface is carried out finishing and screw thread processing, screw in the location filter screen 2 of a side; Fill spherula 3, the location filter screen 2 of opposite side is installed again.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction, to any simple modification, equivalent variations that above embodiment did, all falls within protection scope of the present invention on every foundation technical spirit of the present invention.
Claims (9)
1. flow measurement device based on porous medium; The measuring tube (1) that comprises column type; It is characterized in that: two location filter screens (2) are installed in measuring tube (1), and between two location filter screens (2), piling up has spherula (3), and spherula (3) is piled into the porous medium of multilayer in measuring tube (1); Two piezometric tube (4) are installed on the sidewall of measuring tube (1), and two piezometric tube (4) are positioned at the build-up areas of spherula (3).
2. a kind of flow measurement device based on porous medium according to claim 1 is characterized in that: the sphere diameter of said spherula (3) is less than or equal to 1/3 of measuring tube (1) diameter.
3. a kind of flow measurement device based on porous medium according to claim 1 is characterized in that: the accumulation number of plies of said spherula (3) is at least 10 layers.
4. a kind of flow measurement device based on porous medium according to claim 1 is characterized in that: the distance of the location filter screen (2) at said two piezometric tube (4) and two ends on spherula (3) is axial is not less than the diameter of 1 times of spherula (3).
5. a kind of flow measurement device based on porous medium according to claim 1 is characterized in that: said location filter screen (2) is discoideus, and its end face is provided with through hole (5).
6. a kind of flow measurement device based on porous medium according to claim 5 is characterized in that: said through hole (5) is and is circular hole or bar hole.
7. a kind of flow measurement device according to claim 5 based on porous medium; It is characterized in that: the side of filter screen (2) is provided with external thread in said location, and measuring tube (1) inwall is provided with and locatees the internal thread that the external thread of filter screen (2) is complementary.
8. a kind of flow measurement device based on porous medium according to claim 1 is characterized in that: the open end of said piezometric tube (4) the formation inverted cone-shaped structure that caves inward.
9. the flow-measuring method based on porous medium is characterized in that, may further comprise the steps:
(A) the granular pattern porosint that utilizes spherula (3) to be piled into;
(B) make detected fluid pass through the granular pattern porosint of step (A);
(C) two pressure taps are selected in the different location on the granular pattern porosint of detected fluid process, and the pressure signal of pressure tap is transferred to differential pressure transmitter, form the curve that satisfies the Ergun relational expression.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012103171760A CN102840886A (en) | 2012-08-31 | 2012-08-31 | Porous medium-based flow measuring device and implementation method thereof |
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| CN2012103171760A CN102840886A (en) | 2012-08-31 | 2012-08-31 | Porous medium-based flow measuring device and implementation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2521595A (en) * | 2013-11-26 | 2015-07-01 | Oes Medical Ltd | Flow sensing device |
| CN105719707A (en) * | 2014-12-01 | 2016-06-29 | 上海核工程研究设计院 | Differential pressure measuring point layout structure in pressurized water reactor integral hydraulic simulation test |
| CN107687876A (en) * | 2016-08-06 | 2018-02-13 | 赵乐 | A kind of measurement apparatus and measuring method for measuring fluid flow |
| CN113325028A (en) * | 2021-06-07 | 2021-08-31 | 中国核动力研究设计院 | Boiling critical experiment device for unstable flow of natural circulation system and control method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435253A (en) * | 2011-11-18 | 2012-05-02 | 中国科学院电工研究所 | Flow adjusting device for fluid conveying pipeline |
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2012
- 2012-08-31 CN CN2012103171760A patent/CN102840886A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435253A (en) * | 2011-11-18 | 2012-05-02 | 中国科学院电工研究所 | Flow adjusting device for fluid conveying pipeline |
Non-Patent Citations (2)
| Title |
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| 刘学强等: "《多孔介质内单相流阻力特性》", 《核动力工程》 * |
| 昝元峰等: "《含内热源多孔介质的局部换热特性实验研究》", 《核动力工程》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2521595A (en) * | 2013-11-26 | 2015-07-01 | Oes Medical Ltd | Flow sensing device |
| CN105719707A (en) * | 2014-12-01 | 2016-06-29 | 上海核工程研究设计院 | Differential pressure measuring point layout structure in pressurized water reactor integral hydraulic simulation test |
| CN107687876A (en) * | 2016-08-06 | 2018-02-13 | 赵乐 | A kind of measurement apparatus and measuring method for measuring fluid flow |
| CN113325028A (en) * | 2021-06-07 | 2021-08-31 | 中国核动力研究设计院 | Boiling critical experiment device for unstable flow of natural circulation system and control method |
| CN113325028B (en) * | 2021-06-07 | 2022-05-24 | 中国核动力研究设计院 | Boiling critical experiment device for unstable flow of natural circulation system and control method |
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Application publication date: 20121226 |