CN101876562A - Cone governor type differential pressure flowmeter - Google Patents
Cone governor type differential pressure flowmeter Download PDFInfo
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- CN101876562A CN101876562A CN2009102418961A CN200910241896A CN101876562A CN 101876562 A CN101876562 A CN 101876562A CN 2009102418961 A CN2009102418961 A CN 2009102418961A CN 200910241896 A CN200910241896 A CN 200910241896A CN 101876562 A CN101876562 A CN 101876562A
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- 239000012530 fluid Substances 0.000 abstract description 24
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- 238000009792 diffusion process Methods 0.000 abstract 2
- 238000005259 measurement Methods 0.000 description 13
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Abstract
The invention discloses a cone governor type differential pressure flowmeter which comprises an annular inlet section (1) and a flow cone governor (2) positioned at the bottom of the annular inlet section, a cone contraction section (3), a cone throat section (4), a cone diffusion section (5), and a differential pressure signal measuring pipe (6) arranged in the annular inlet section along the direction vertical to the axes of the cone throat section (4), wherein the cone contraction section (3), the cone throat section (4) and the cone diffusion section (5) are sequentially arranged above the flow cone governor (2) from top to bottom. The flowmeter has simple structure, easy processing and manufacture and capability of continuously adjusting the flowing resistance, and can be used for measuring the flow of flowing of small drive pressure head and high-temperature high-pressure fluid in the thermohydraulics experimental study.
Description
Technical field
The present invention relates to the flow measurement technical field, particularly relate to a kind of adjusting bevel-type differential pressure flowmeter of annular entrance flow measurement.
Background technology
Throttle differential flowmeter is to measure flow, proving flowmeters such as throttle differential flowmeter abacus flowmeter, nozzle flowmeter and Venturi tube flowmeter commonly used according to Bernoulli's theorem by measuring the differential pressure signal that produces in the process fluid flow.Proving flowmeter is simple in structure, service time is long, do not need independent demarcation, so in flow measurement instrument, occupy main status, but proving flowmeter has been stipulated type of fluid that it adapts to, fluid flow conditions and to requirements such as pipeline condition, mounting condition, fluid parameters, particularly the flow development length to throttling element upstream and downstream side has strict regulation, even the classical Venturi tube that flow development length is the shortest, the flow development length of its upstream side necessity also requires to reach about 10D, and the flow development length in downstream requires to reach 5D.Very limited for the space of physical condition middle and upper reaches side like this, and swim inlet and also needed to carry out once annular in the past and turn and flow entering flow measurement, such mal-condition has produced considerable influence for the accurate measurement of flow.
Although the standard form throttle differential flowmeter has advantages such as not needing separately demarcations, installing space inadequately, annular entry, little drive ram, High Temperature High Pressure and can carry out that its use has been subjected to considerable restraint under the condition such as resistance coefficient adjusting.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structure, be easy to processing and manufacturing, be applicable to the annular entry condition, the upstream and downstream side limited space of flowmeter throttling element, resistance regulate and regulate the bevel-type differential pressure flowmeter reliably.
For achieving the above object, a kind of adjusting bevel-type differential pressure flowmeter according to embodiment of the present invention is provided, it comprises the annular entry section and is positioned at the flow regulation awl of the bottom of described annular entry section, from bottom to top is set in turn in conical contraction section, cylindrical shape throat section and the conical diffuser of the top of described flow regulation awl, and is arranged in differential pressure signal measuring tube in the described annular entry section along the direction with the axis normal of cylindrical shape throat section.
Preferably, the differential pressure signal measuring tube is arranged in cylindrical shape throat section along the direction with the axis normal of cylindrical shape throat section.
Preferably, described flow regulation awl comprises in-line adjusting mouth, threaded rod and cone, and an end of described threaded rod is inserted into the inner by the bottom of cone, and the other end connects described adjusting mouth.
Preferably, the height of described flow regulation awl is 80mm-100mm.
Preferably, the bottom surface circular diameter of described cone is 90mm, and bus length is 90mm, and drift angle is 60 °.
Preferably, the distance between the bottom surface of described conical contraction section and described annular entry section be conical contraction section the inlet circular diameter 1/4.
Technique scheme has following advantage: by the height and the bottom surface circular conical surface diameter of appropriate design flowmeter cone governor, and can be not enough, the fluid under the annular entry condition flows and carry out meticulous flow measurement to installing space; Because the appropriate design of distance between conical contraction section and the annular entry section, it is little far beyond the pressure loss of the standard throttle differential flowmeter under the identical measuring condition to make this cone governor flowmeter can not return to the original pressure loss after fluid flows through throttling element; This flowmeter structure is simple, be easy to processing and manufacturing, resistance to flow can be regulated continuously, can be used for the flow measurement that medium and small drive ram of thermohydraulics experimental study and high-temperature, high pressure fluid flow.
Description of drawings
Fig. 1 is the structural representation according to the adjusting bevel-type differential pressure flowmeter of embodiment of the present invention;
Fig. 2 is the flow regulation wimble structure synoptic diagram according to the adjusting bevel-type differential pressure flowmeter of embodiment of the present invention;
Fig. 3 tests the pressure reduction-discharge relation curve that obtain with the cone governor height change according to the adjusting bevel-type differential pressure flowmeter of embodiment of the present invention under normal temperature and pressure conditions;
Fig. 4 is that adjusting bevel-type differential pressure flowmeter according to embodiment of the present invention is at the variation relation curve of normal temperature and pressure conditions down-off meter resistance coefficient with inlet flow rate;
Fig. 5 regulates the variation relation curve of resistance with the cone governor height according to the adjusting bevel-type differential pressure flowmeter of embodiment of the present invention at the normal temperature and pressure conditions lower inlet;
Fig. 6 tests the throttling element Re number-coefficient of flow relation curve that obtains according to the adjusting bevel-type differential pressure flowmeter of embodiment of the present invention under normal temperature and pressure conditions.
Wherein, 1: the annular entry section; 2: the flow regulation awl; 3: conical contraction section; 4: cylindrical shape throat section; 5: conical diffuser; 6: the differential pressure signal measuring tube; 7: regulate mouth; 8: threaded rod; 9: cone.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
As depicted in figs. 1 and 2, this is regulated the bevel-type differential pressure flowmeter and mainly is made up of annular entry section 1, flow regulation awl 2, conical contraction section 3, cylindrical shape throat section 4, conical diffuser 5 and differential pressure signal measuring tube 6, wherein said flow regulation awl 2 is positioned at the bottom of described annular entry section, conical contraction section 3, cylindrical shape throat section 4 and conical diffuser 5 from bottom to top are set in turn in the top of described flow regulation awl 2, and differential pressure signal measuring tube 6 is arranged in the described annular entry section along the direction with the axis normal of cylindrical shape throat section 4.Wherein said flow regulation awl 2 specifically is made up of " one " shape adjusting mouth 7, threaded rod 8 and cone 9 again, and an end of described threaded rod is inserted into the inner by the bottom of cone, and the other end connects described adjusting mouth.The height of described flow regulation awl is preferably 80mm-100mm.The bottom surface circular diameter of described cone is preferably 90mm, and bus length is preferably 90mm, and drift angle is preferably 60 °.Distance between the bottom surface of described conical contraction section and described annular entry section be preferably conical contraction section the inlet circular diameter 1/4.
Flow measurement device is vertically placed, fluid gravitate or rely on other stressed effect to form certain initial velocity to flow into by annular entry section 1, producing annular in the bottom of annular entry section 1 turns, fluid is under the regulating action of the bottom rate cone governor 2 of annular entry section 1, in the conical contraction section 3 of turning longshore current linear flow inbound traffics meter, along with the cross section of fluid channel area of conical contraction section 3 diminishes, the flow velocity that fluid flows increases, and hydrodynamic pressure reduces.Then fluid arrives in the conical diffuser 5 through cylindrical shape throat section 4, enters pipeline then.Nearly wall place in cylindrical shape throat section 4 is furnished with the interior measuring point A of differential pressure signal measuring tube 6, and with the annular entry section 1 of interior measuring point A equal height in arrange a points outside B, the differential pressure value that interior measuring point A and outer measuring point B record is sent into differential pressure transmitter, can obtain the flow through differential pressure value of throat section of fluid.
Figure 3 shows that the pressure reduction-fluctuations in discharge relation of different adjustment cone height under the normal temperature and pressure conditions.Figure 4 shows that the variation relation curve of normal temperature and pressure conditions down-off meter resistance coefficient with inlet flow rate.(resistance coefficient among Fig. 4 is defined as
)
Analyze as seen in conjunction with Fig. 3 and Fig. 4, adjusting bevel-type differential pressure flowmeter provided by the present invention, its pressure reduction-fluctuations in discharge relation is level and smooth, and differential pressure is with the fluctuations in discharge sensitivity.
Figure 5 shows that the variation relation of normal temperature and pressure conditions lower inlet resistance with the cone governor height.Adjusting bevel-type differential pressure flowmeter provided by the present invention is regulated (among the present invention between the preferred 80mm-100mm) by the cone governor height in the proper range, and the variation relation of the resistance that obtains-cone governor height is level and smooth.
Flow for the fluid in the general flowmeter, the pass that can obtain between mass rate G and the differential pressure Δ P according to the Bernoulli equation of total stream is:
In following formula,
G: the mass rate of fluid (under the operating mode), kg/s;
C: efflux coefficient;
ε: the inflatable coefficient of measured medium, for incompressible fluid ε=1 (getting ε=1), compressible fluid ε＜1 such as gas, steam;
Δ P: flowmeter differential pressure (being the differential pressure between measurement point A and the measurement point B), Pa;
D: flowmeter upstream line diameter, m;
ρ: under the working condition, the density of flowmeter upstream end fluid, kg/m3.
β: the equivalent diameter ratio is called " throttling is than coefficient " again, in order to describe the throttle degree of a restriction device.Numerically, it equals restriction device at the minimum flow area at throttling element place and the square root of the long-pending ratio of restriction device inner section.In the present embodiment, the size of β value is corresponding at the lifting height of annular entry section bottom with flow regulation awl 2.
In addition, in the present embodiment because of efflux coefficient C and equivalent diameter than β all along with the lifting height of cone governor changes, be to reduce variable quantity, thereby utilize related efflux coefficient C of coefficient of flow α and equivalent diameter than β, obtain:
And then simultaneous relational expression (1) and (2) can get, and the pass between mass rate G and the coefficient of flow α is:
According to the above-mentioned relation formula between mass rate G and the coefficient of flow α, then can obtain under the normal temperature and pressure conditions along with the variation of cone governor height, the Re number of throttling element and the relation curve of coefficient of flow α are as shown in Figure 6.
The span of the resultant coefficient of flow α of experimental study in according to the present invention is between 0.4～1.2.Then based on the coefficient of flow α that has obtained under the different adjustment cone height condition, according to the flowmeter differential pressure value that measures, just can ask for the flow number that real fluid flows under difference inlet resistance condition in actual use traffic timing by the pressure reduction-flow equation of following formula.
Adjusting bevel-type differential pressure flowmeter resistance range of adjustment among the present invention is wide, can satisfy different resistances and regulate requirement.
For carrying out the flow measurement under the High Temperature High Pressure, can realize by following steps.
According to the coefficient of flow α under the different adjustment cone height condition of obtaining in the top formula, determine under the normal temperature and pressure conditions that along with the variation of cone governor height, the Re number of throttling element and the functional relation of coefficient of flow α are:
α＝Φ(Re
D)
According to the differential pressure transmitter reading, record the differential pressure Δ p ' under the high-temperature and high-pressure conditions, under the identical condition similar of geometry with Euler, the flow G-differential pressure Δ p relation during according to normal temperature and pressure, the flow G ' value during the preresearch estimates High Temperature High Pressure.
The physical property of fluid media (medium) (water) under flow G ' value during according to the High Temperature High Pressure of estimation and the high-temperature and high-pressure conditions, it is several to calculate high-temperature and high-pressure conditions throttling element Re ' down.
According to throttling element Re number and the coefficient of flow αHan Shuo relational expression under the normal temperature and pressure that obtains in the step (1),, ask the coefficient of flow α ' that obtains under the High Temperature High Pressure by the High Temperature High Pressure Re ' in the step (3).
According to the relational expression between mass rate G and the coefficient of flow α, and the coefficient of flow α ' that is tried to achieve in the step (4), the flow G ' value under the high-temperature and high-pressure conditions calculated.
Flow G ' the value of calculating in the flow G ' of estimation value and the step (5) in the comparison step (2) if in the scope that error allows, thinks that then the flow G ' value under the High Temperature High Pressure that calculates in the step (5) is an actual value.Otherwise based on the flow G ' value of calculating in the step (5), repeating step (3)-step (6) is calculated, and meets the demands until error, and the flow value that obtains at last is the flow G ' value under the High Temperature High Pressure.
As can be seen from the above embodiments, the embodiment of the invention by appropriate design flowmeter cone governor height and the diameter of bottom surface circular conical surface, can be not enough, the fluid under the annular entry condition flows and carry out meticulous flow measurement to installing space; Because the appropriate design of distance between conical contraction section and the annular entry section, it is little far beyond the pressure loss of the standard throttle differential flowmeter under the identical measuring condition to make this cone governor flowmeter can not return to the original pressure loss after fluid flows through throttling element; This flowmeter structure is simple, be easy to processing and manufacturing, resistance to flow can be regulated continuously, can be used for the flow measurement that medium and small drive ram of thermohydraulics experimental study and high-temperature, high pressure fluid flow.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (6)
1. regulate the bevel-type differential pressure flowmeter for one kind, it is characterized in that, described adjusting bevel-type differential pressure flowmeter comprises annular entry section (1) and is positioned at the flow regulation awl (2) of the bottom of described annular entry section, from bottom to top is set in turn in conical contraction section (3), cylindrical shape throat section (4) and the conical diffuser (5) of the top of described flow regulation awl (2), and is arranged in the interior differential pressure signal measuring tube (6) of described annular entry section along the direction with the axis normal of cylindrical shape throat section (4).
2. adjusting bevel-type differential pressure flowmeter as claimed in claim 1 is characterized in that, differential pressure signal measuring tube (6) edge is arranged in cylindrical shape throat section (4) with the direction of the axis normal of cylindrical shape throat section (4).
3. adjusting bevel-type differential pressure flowmeter as claimed in claim 2, it is characterized in that, described flow regulation awl (2) comprises that " one " shape is regulated mouthful (7), threaded rod (8) and cone (9), one end of described threaded rod (8) is inserted into the inner by the bottom of cone (9), and the other end of threaded rod (8) connects described adjusting mouthful (7).
4. adjusting bevel-type differential pressure flowmeter as claimed in claim 3 is characterized in that, the height of described flow regulation awl (2) is 80mm-100mm.
5. adjusting bevel-type differential pressure flowmeter as claimed in claim 4 is characterized in that the bottom surface circular diameter of described cone (9) is 90mm, and bus length is 90mm, and drift angle is 60 °.
6. as each described adjusting bevel-type differential pressure flowmeter of claim 1-5, it is characterized in that, the distance between the bottom surface of described conical contraction section (3) and described annular entry section (1) be conical contraction section (3) the inlet circular diameter 1/4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102418961A CN101876562B (en) | 2009-12-14 | 2009-12-14 | Cone governor type differential pressure flowmeter |
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| CN2009102418961A CN101876562B (en) | 2009-12-14 | 2009-12-14 | Cone governor type differential pressure flowmeter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807793A (en) * | 2016-05-24 | 2016-07-27 | 中冶焦耐工程技术有限公司 | Dust removal pipeline dust gas flow adjustment system |
| CN111122395A (en) * | 2019-12-04 | 2020-05-08 | 天津大学 | Mobile supersonic nozzle continuous measurement system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0076882B1 (en) * | 1981-10-13 | 1985-07-17 | Alberta Oil Sands Technology And Research Authority | Device and method for determining flow rates in a two-phase stream |
| JP3088528B2 (en) * | 1991-12-04 | 2000-09-18 | キヤノン株式会社 | Micro-liquid flow rate detection element and micro-liquid supply device using the element |
| CN2147513Y (en) * | 1992-12-10 | 1993-11-24 | 邵朋诚 | Circulation hole plate flow quantity transforming device |
| CN201007662Y (en) * | 2007-02-14 | 2008-01-16 | 大连亨利测控仪表工程有限公司 | Wenke conical flowmeter |
| CN201034644Y (en) * | 2007-04-28 | 2008-03-12 | 上海肯特智能仪器有限公司 | Annular pressure sampling type V awl flow rate sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807793A (en) * | 2016-05-24 | 2016-07-27 | 中冶焦耐工程技术有限公司 | Dust removal pipeline dust gas flow adjustment system |
| CN111122395A (en) * | 2019-12-04 | 2020-05-08 | 天津大学 | Mobile supersonic nozzle continuous measurement system |
| CN111122395B (en) * | 2019-12-04 | 2022-05-13 | 天津大学 | Mobile supersonic nozzle continuous measurement system |
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