CN102589623A - High-accuracy wide-range flow meter - Google Patents
High-accuracy wide-range flow meter Download PDFInfo
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- CN102589623A CN102589623A CN2012100481093A CN201210048109A CN102589623A CN 102589623 A CN102589623 A CN 102589623A CN 2012100481093 A CN2012100481093 A CN 2012100481093A CN 201210048109 A CN201210048109 A CN 201210048109A CN 102589623 A CN102589623 A CN 102589623A
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- 239000012530 fluid Substances 0.000 claims abstract description 78
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 230000003044 adaptive effect Effects 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000004886 process control Methods 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000003345 natural gas Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
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- 230000007613 environmental effect Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The invention relates to a high-accuracy wide-range flow meter with wider measuring range and higher measuring accuracy, comprising a shell, wherein the shell is provided with an inner cavity for circulation of fluid; connection parts convenient for adaptive connection with a fluid transportation pipeline are arranged at the two ends of the shell; a baffle-shaped stressed flow resisting piece is arranged at the middle position of the inner cavity of the shell and is connected with a sensor; the sensor is connected with a signal processor; a fluid guiding sleeve for accelerating the fluid to be measured is arranged at the middle part of the shell; and the stressed flow resisting piece is located at a position where the fluid flow rate is higher in the shell and is in a state capable of moving towards low-flow rate positions under the action of the fluid. The flow meter is superior in performance, suitable for situations such as process control, fluid measuring and the like and particularly suitable for heat meters and low-flow fluid measurement in the measurement of energies such as natural gas and the like; as the starting flow of the flow meter is lower than that of a household water meter, the flow meter can also be applied in measuring branch fluids of water works in abundance, is capable of decreasing the enterprise loss and has very good practicality.
Description
Technical field
The present invention relates to a kind of gauging instrument, specifically mainly be applicable to the flowmeter of DN300 bore with test fluid flow in the interior pipeline.
Background technology
In fluid metering, flowmeter is the important component part of metering Instrument equipment, and flowmeter has obtained using widely in each field.It plays an important role in the detection of aspects such as process control, energy measurement, environmental protection.
In the prior art flowmeter mainly exist flow range narrow, be prone to stop up, shock resistance is poor, be subject to the flow disturbance influence, and under low discharge and extra small flow (liquid is lower than 50L/h, and gas is lower than 500L/h) condition, can not measure.Turbo blade like turbo flow meter receives fluid impact yielding, the easy to wear and obstruction of bearing; The vortex shedding flow meter low discharge does not measure, and measurement range is narrow, is subject to the upstream fluid disturbing influence; The target type meter shock resistance is poor, and measurement range is narrow; The sensor of ultrasonic flow meter is subject to the foul influence and stops up, and is subject to the upstream fluid disturbing influence.More than the drawback of several moneys flowmeter commonly used be exactly serious inaccurate problem when the metering low discharge, all to occur measuring or measuring.
Summary of the invention
Fundamental purpose of the present invention provides a kind of high-precision wide range flowmeter that range is wideer, measuring accuracy is higher that measures.
Technical scheme of the present invention is: a kind of high-precision wide range flowmeter; Comprise housing, housing has the inner chamber that supplies fluid flow, and the housing two ends are provided with to be convenient to and the adaptive connecting portion that is connected of fluid-transporting tubing; The centre position of housing inner chamber is provided with the stressed choked flow piece of baffle-like; Stressed choked flow piece is connected with sensor, and sensor connects signal processor, it is characterized in that: described housing middle part is provided for quickening to treat the water conservancy diversion cover of fluid measured; Described stressed choked flow piece is positioned at the higher position of housing inner fluid speed, and is in the state that can move to low flow velocity position under the fluid effect.Just stressed choked flow piece receives fluid impact and away from the residing position of choked flow piece free state.
In the technical scheme of the present invention, outstanding improvement is to have increased the water conservancy diversion cover will treat that fluid measured quickens, and the water conservancy diversion cover can be the structure that intracavity diameter changes, or have turbine or engine driven supercharging accelerating structure etc. under the exterior power effect.Simultaneously the water conservancy diversion cover must not influence the motion of stressed choked flow piece under fluid impact, and its embodiment can be to put at water conservancy diversion breach or stressed choked flow piece are set are positioned at the water conservancy diversion cover near exporting etc.Like this because fluid is quickened by the water conservancy diversion cover; So under the situation of flow unchanged, just the fluid mass that passes through is constant the unit interval, but speed increases, just kinetic energy increases; The effect of impact choked flow piece is more obvious so; The sensor that is connected with stressed choked flow piece like this, signal processor can be responded to and detect littler flow signal, thus the range ability of flowmeter significantly widen, more responsive to the detection of flow, accuracy of detection is just higher naturally.
The present detectable beginning, moving flow can reach liquid: 0.1L/h, gas: 0.3L/h; Maximum range can reach 1: 1000 times; Ultimate limit state can reach 1: 10000 times, that is to say under 1: 10000 times range also can detect.Measuring accuracy reaches 0.5 grade of range of liquid 1: 50,1.0 grades of ranges of gas 1: 30; The pressure loss only reaches the 1/3-1/4 with the flow orifice plate; During installation, 2DN, back 1DN before flow development length only needs respectively before and after the flowmeter, than need before in the prior art 10DN, after need the technical requirement of 5DN significantly to reduce, improved the adaptive faculty of flowmeter.And the occasion that also is fit to FLUID TRANSPORTATION such as liquid, gas, steam; Its principle and function also can be used under the situation of fluid high temperature, high pressure, low temperature, and versatility is good.
This flowmeter performance is superior, is fit to occasions such as process control, fluid metering and uses, and especially is fit to the metering of the low discharge in heat energy table, the metering of rock gas equal energy source; Because of moving flow of its beginning is lower than the moving flow of beginning of domestic meter, so also can be used for the metering that linear flow rate props up in water factory in a large number, the minimizing loss of enterprises.Have extraordinary practicality, be beneficial to the raising of energy-conserving and environment-protective technology.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the sectional structure synoptic diagram of water conservancy diversion cover;
Fig. 3 is the vertical view of Fig. 2;
Fig. 4 is the perspective view of water conservancy diversion cover;
Fig. 5 is the front view of first rectifier;
Fig. 6 is the sectional structure synoptic diagram that state is looked on the left side of first rectifier shown in Figure 5;
Fig. 7 is the front view of the 3rd rectifier;
Fig. 8 is the sectional structure synoptic diagram that state is looked on the right side of the 3rd rectifier.
Embodiment
A kind of high-precision wide range flowmeter as shown in Figure 1 comprises housing 8, and housing 8 has the inner chamber that supplies fluid flow; Ring flange is set at housing 8 two ends or welded structure is convenient to be connected with fluid-transporting tubing is adaptive, and the centre position of housing 8 inner chambers is provided with the stressed choked flow piece 5 of baffle-like, and stressed choked flow piece 5 is connected with sensor 12; Sensor 12 connects signal processor; Certainly, signal processor also to connect controller with or display etc., realize detecting and the purpose of control automatically.Whole flowmeter profile is similar to inverse-T-shaped.Improvement of the present invention is: described housing 8 middle parts are provided for quickening to treat the water conservancy diversion cover 1 of fluid measured, and described stressed choked flow piece 5 is positioned at water conservancy diversion and overlaps the higher position of 1 inner fluid speed, and are in the state that can move to low flow velocity position under the fluid effect.Stressed like this choked flow piece 5 is subjected to displacement by fluid impact, these displacement signals of sensor 12 induction, and signal is passed to signal processor carry out signal Processing and realize detecting.
As shown in Figure 1; Specifically: described stressed choked flow piece 5 is connected with sensor 12 through sheet spring 10, the sheet spring 10 longshore current body working direction even arranging multiplayer that superposes, and each sheet spring 10 size of longshore current body working direction reduce; Each sheet spring 10 upper end is concordant, and the lower end is short more to downstream fluid more.Concrete example as: each sheet spring 10 length difference all is 10 millimeters, and first connects force-summing element and the wideest, and each sheet spring 10 stand out all is 2 millimeters, and narrow sheet spring 10 is placed in the middle with respect to the position, the left and right sides of wide spring 10.It is identical aperture that each sheet spring 10 connects 12 places of connecing with sensor, and each sheet spring 10 does not hold the connecting hole center to be upwards 10 millimeters of the lower ends of short-movie spring 10.A plurality of springs 10 are affixed through the bolt stack through the connecting hole on the plate face like this; The high more structure of each sheet spring 10 lower end position of downstream can make the elastic force of stressed choked flow piece under fluid impact increase comparatively fast more; Play the certain protection effect at big flow status, avoid sheet spring 10 and stressed choked flow piece to fracture; Just play steady vibration damping and the purpose that increases stressed choked flow piece 5 intensity.
For the ease of parts such as sensor installation 12 and signal processors; Flange connector upwards is set on the housing 8, and air chamber base 11 lower ends are provided with bulge loop, and flange circle 9 compresses bulge loop and is connected with housing 8 usefulness bolts; Sensor 12 inserts air chamber base 11 and flange connector inner chamber from top to bottom; Sensor 12 lower ends are connected with sheet spring 10, and sheet spring 10 lower ends connect stressed choked flow piece 5, and the larger-size position of sensor 12 upper ends is supported in the counterbore on air chamber base 11 tops; And compress by set nut 13, the hollow cavity of the signal wire of sensor 12 through set nut 13 is communicated to and outsidely is connected with signal processor or display etc.After fluid is flowed through 1 acceleration of water conservancy diversion cover; Fluid promotes stressed choked flow piece 5 more significantly; Stressed choked flow piece 5 drives sheet spring 10 and produces displacement, and the acting force that this displacement produces passes to sensor 12 through lever principle with power, and sensor 12 passes to flowmeter controller or signal processor with signal; The acquisition flow parameter is changed, handled to signal, show then or control automatically.Certainly, stressed choked flow piece 5 can also have numerous embodiments with reference to prior art or improvement rationally with sensor 12 parts such as grade and set-up mode.
Improved core is: flow velocity is high during stressed choked flow piece 5 because fluid through the acceleration of water conservancy diversion cover 1, is flowed through, and sensor 12 can both detect signal during minimum flow, so that stressed choked flow piece 5 is hit is more responsive, the range ability of detection is bigger, precision is higher.
Water conservancy diversion cover 1 can be the structure that intracavity diameter changes; Or turbine or the engine driven supercharging accelerating structure of exterior power under driving, can also be the water conservancy diversion accelerating structure etc. of the rifling formula of for example gun barrel inner chamber; Optimized technical scheme is like Fig. 2,3, shown in 4: described housing 8 inner chambers are cylindric, and water conservancy diversion cover 1 be a tubulose, and it is identical and be fixed in housing 8 inside that water conservancy diversion overlaps 1 external diameter and housing 8 internal diameters; Water conservancy diversion overlaps 1 inner chamber and is the thick receipts waist shape in middle thin two ends; Water conservancy diversion overlaps 1 top and offers breach, and breach overlaps 1 middle part by water conservancy diversion and extends to rear end face, and described stressed choked flow piece 5 bottoms are by this breach water conservancy diversion cover 1 of packing into.As for ways of connecting can be that interference is pegged graft or overlapped 1 two ends with water conservancy diversion and receives locating part to keep out and be fixed in the housing 8 etc.According to the ultimate principle that fluid flows, under the certain situation of flow, water conservancy diversion overlaps that 1 middle part caliber is thinner, and then flow velocity can increase, and is more obvious to the impact of stressed choked flow piece 5, is beneficial to flowing of stressed choked flow piece 5 induction fluids.And such water conservancy diversion overlaps 1 simple in structure, reliable in function.
Be more preferably: described breach be positioned at end face 101 that water conservancy diversion overlaps 1 middle part be 60 ° oblique down, the water conservancy diversion of downstream overlap the minimum position of 1 intracavity diameter and extend; The front side surface of end face 101 lower ends and free state lower stress choked flow piece 5 is fitted, and it is 0.05～0.25mm that described stressed choked flow piece 5 its edge under free state overlaps 1 throat's inwall annular space width to water conservancy diversion; The intracavity diameter that water conservancy diversion overlaps 1 throat is 0.6～0.7: 1 with the ratio of housing 8 intracavity diameters.
Like Fig. 1, shown in 4, for ease of processing with avoid wearing and tearing, water conservancy diversion overlaps 1 throat, and just to overlap the minimum position of 1 inside diameter also be a bit of cylindric tube chamber to water conservancy diversion.End face 101 that is to say the surface that extend on the upper left side among the oblique figure shown in Fig. 4.End face 101 lower ends extend to this cylindric tube chamber right-hand member, and distance stressed choked flow piece 5 is nearest, keeps fit-state basically.Plate face size in conjunction with stressed choked flow piece 5 rationally is provided with; Can just in time make the plate face edge of circular stressed choked flow piece 5 overlap about the about 0.1mm of annular gap width of 1 inwall far from water conservancy diversion; Better scope is 0.05～0.25mm, generally is no more than 0.3mm, exceeds this scope then range ability is corresponding to narrow down.Certainly, right-hand move of fluid impact lower stress choked flow piece 5 in Fig. 1, this spacing increases.Guaranteeing like this has very little flow to detect.Stressed choked flow piece 5 just in time is positioned at the reference position that water conservancy diversion overlaps the frustum part on 1 inner chamber right side simultaneously, can avoid complicated the mobile of convection cell of region shape of fluid process to impact so that the fluid impact that stressed choked flow piece 5 receives is comparatively even.Thickness and housing 8 intracavity diameters that water conservancy diversion overlaps 1 throat's inner chamber have rational dimension scale; About 0.6～0.7: 1; Cause acceleration not obvious when avoiding ratio excessive or too small, perhaps quicken excessive fluid impedance losses or the Hydrodynamic turbulence of causing and damage the parts in the flowmeter.
Described water conservancy diversion cover 1 extra small flow flow through the throat of water conservancy diversion cover 1, just during the minimum position of the mid diameter of inner chamber; Because of stressed choked flow piece 5 is installed in throat's inner chamber; The annular space spacing that stressed choked flow piece 5 edges and throat's inner chamber constitute has only 0.1 millimeter, so this annular slit is very little, so the flow velocity in the annular space has raise more than 100 times at least; The acting force that stressed choked flow piece 5 receives is with the increase of the order of magnitude; So flowmeter also can well measure when extra small flow, metering is sensitiveer, and precision also is improved.
Further, described water conservancy diversion overlaps the rectifier that 1 upper reaches are provided for preliminary accelerating fluid.Like this can be so that flow rate of fluid is accelerated more reposefully.Avoid the fluid of fluid to raise suddenly.
Like Fig. 1,5,6; Preferred rectifier structure is: described rectifier is and stops the discoideus of fluid; The rectification hole that a plurality of flow-through fluids are arranged in the center of circle of rectifier upper edge plate face symmetrically and evenly; Rectifier comprises that the external diameter of first rectifier 2 that the center line of longshore current body working direction is disposed in order and second rectifier, 3, the first rectifiers 2 and housing 8 internal diameters coincide, second rectifier, 3 external diameters are less than first rectifier, 2 external diameters, and two rectifiers 2,3 are mutually from arranging.That is to say water conservancy diversion overlap 1 upper reaches, be among Fig. 1 the left side rectifier be divided into first rectifier 2 and second rectifier 3.With first rectifier 2 is example; Affixed or interference is plugged in the housing 8 discoideus entity through screw thread; Play the effect that stops fluid, rectification hole 201 evenly distributes, and rectification hole 201 diameters are 0.3 times of housing 8 calibers; Be equivalent to reduced cross-sectional area like this, so just played accelerating effect the fluid passage.The setting circle core diameter of the rectification hole of first, second rectifier 2,3 is 0.66 times of housing 8 calibers; Two rectifiers 2,3 are arranged along the center line of housing 8 tubular intracavities; Arrangement as for second rectifier 3 can utilize support; Be more preferably: described first, second rectifier 2,3 is affixed with same bolt through the connecting hole in centre position, and described first rectifier 2 is spirally connected with housing 8.In the middle of just threaded hole 202, second rectifier 3 being set in the middle of first rectifier 2 the respective threads hole is set also, both are fixedly connected with catch with screw rod, and first rectifier 2 is screwed onto housing 8 inwalls and has just realized the fixing of two rectifiers 2,3 then.Structure is very simple, and dismounting is all very convenient.The principle of work of second rectifier 3 is consistent with first rectifier 2; And it is the fluid after 2 acceleration of first rectifier is concentrated to the centre position; Cooperate with second rectifier 3 better, in accelerating fluid, avoid fluid directly and water conservancy diversion overlap 1 end edge friction and cause tangible drag losses.
Further, described water conservancy diversion overlaps 1 downstream overload protection spring 14 is set.Just at stressed choked flow piece 5 rears, be that right side shown in Figure 1 is provided with overload protection spring 14, stressed choked flow piece 5 can be supported by the overload protection spring when fluid impact is excessive, avoid damaging.
Described water conservancy diversion overlaps 1 downstream the 3rd, the 4th rectifier 6,7 is set in proper order; The 4th rectifier 7 is and blocks the discoideus of fluid; The 3rd rectifier 6 is the dome shape of opening towards water conservancy diversion cover 1; The 3rd rectifier 6 external diameters are less than the 4th rectifier 7 external diameters, and the external diameter of the 4th rectifier 7 and housing 8 internal diameters coincide, and described the 4th rectifier 7 is spirally connected with housing 8; Three, the 4th rectifier 6,7 is affixed with same bolt through the connecting hole in centre position, and overload protection spring 14 is installed on the side of the 3rd rectifier 6 towards water conservancy diversion cover 1; Three, the center of circle of the 4th rectifier 6, the 7 upper edge plate faces rectification hole of arranging a plurality of flow-through fluids symmetrically and evenly.That is to say that the 3rd, the 4th rectifier 6,7 longshore current body working direction are disposed in order and coaxial with columned housing 8 inner chambers.The 4th rectifier 7 is identical with first rectifier, 2 structures.The 3rd rectifier 6 is like Fig. 7, shown in 8; Rectification hole 601 supplies fluid flow, and center pit 602 is convenient to bolt and is connected, and lid clamps overload protection spring 14 along 603 inner chambers; Three, the rectification function of the 4th rectifier 6,7 is just in time opposite with first, second rectifier 2,3; They are to slow down reposefully through the fluid that two step rectifications will speed up again, and recover the proper flow speed of fluid, to adapt to the technological requirement of production.Such structure is convenient to connect overload protection spring 14, compactness simple and reasonable for structure.
When superimposed sheets spring 10 is deformed to specified dominant bit, the overload protection spring 14 at stressed choked flow piece 5 rears will play an effect that stops and cushion, avoid stressed choked flow piece 5 when fluid flow fluctuates by impact failure; Fluid the 3rd, the 4th rectifier 6,7 of flowing through at last, the disturbance of eliminating flowmeter flows into lower procedure with influence.
Handle through the water conservancy diversion cover 1 and the rectification of its both sides, front and back; When flowmeter of the present invention is installed; 2DN, back 1DN before flow development length only needs respectively before and after the flowmeter, than need before in the prior art 10DN, after need the technical requirement of 5DN significantly to reduce, improved the adaptive faculty of flowmeter.
Further, described housing 8 connects the backflow by-pass collars, and the backflow by-pass collar comprises by-pass pipe, and an end of by-pass pipe inner chamber overlaps with the water conservancy diversion of housing 8 inner chambers that 1 upstream region communicates, the other end overlaps 1 downstream area with the water conservancy diversion of housing 8 inner chambers and communicates; By-pass pipe middle part is provided with the cavity volume 16 that volume increases, and overlaps the bypass mouth of pipe that housing 8 inner chambers in 1 downstream are communicated with water conservancy diversion on the cavity volume 16 and is sealed by the catch 4 that compression spring 15 supports.Obviously, for realizing goal of the invention, the elastic force of described compression spring 15 is less than the elastic force of sheet spring 10.
When running into the fluid backflow, consider that the slit between stressed choked flow piece 5 and the water conservancy diversion cover 1 is very little, the deflection of sheet spring 10 resiliences is little; The flow that fluid flows through is just little, can influence the flow of backflow, even destroys sheet spring 10; So the ad hoc backflow by-pass collar of having counted is as shown in Figure 1 outside housing 8, the cavity volume 16 of communicating pipe inner chamber is set at the by-pass pipe middle part; Connect a bolt in the middle of utilizing similar first rectifier 2 plate body with holes 17 equally; Sheathed compression spring 15 on the bolt is to the right the locating part of catch 4 and bolt end successively, and this plate body 17 with holes can be advantageously connected on by-pass pipe and the port that cavity volume 16 communicates.Constitute folk prescription to the reflux that flows, compression spring 15 promotes the catch 4 sealing right side bypass mouths of pipe during flowmeter operate as normal, and by-pass pipe is in and cuts off state fully; Under the fluid thrust, promoting catch 4 when fluid refluxes is moved to the left; By-pass pipe is in open mode, and reflux fluid is avoided stressed choked flow piece 5 is caused damage with sheet spring 10; Prolong the serviceable life of flowmeter, improve the adaptive faculty of flowmeter at the complex working condition that has the backflow risk to exist.
In sum, the present invention absorbs the measuring principle of suspended body flowmeter and target type meter and further improves, and this that develop quickens high-precision wide range flowmeter.Because of mainly having adopted water conservancy diversion cover 1, multistage rectifier, superimposed sheets spring 10, overload protection spring 14, the flow range that makes flowmeter detect is wideer, tiny flow quantity detects sensitivelyer, and shock resistance, the disturbance of anti-current body, anti-clogging, serviceable life are more lasting.
For making those skilled in the art understand useful technique effect of the present invention more intuitively, the data of flowmeter of the present invention being carried out demonstration test are provided below.
Table 1 high-precision wide range flowmeter detects data (1)
Remarks: gas meter adopts the calibrating of p.V.T.t method gas flow standard device, seized instrument bore: DN50, and detected pressures: 101.5KPa, detected temperatures: 17.84 ℃, device uncertainty: 0.20%.
Table 2 high-precision wide range flowmeter detects data (2)
Remarks: gas meter adopts the calibrating of p.V.T.t method gas flow standard device, seized instrument bore: DN80, and detected pressures: 102.0KPa, detected temperatures: 10.65 ℃, device uncertainty: 0.20%.
Table 3 high-precision wide range flowmeter detects data (3)
Remarks: gas meter adopts the calibrating of p.V.T.t method gas flow standard device, seized instrument bore: DN150, and detected pressures: 101.7KPa, detected temperatures: 12.14 ℃, device uncertainty: 0.20%.
Table 4 high-precision wide range flowmeter detects data (4)
Remarks: the liquid table adopts the quality formula flow standard device calibrating of weighing, and surveys with the 1000ml measuring cup when flow is lower than 0.1t/h; Seized instrument bore: DN50, detected temperatures: 16.5 ℃, starting flow 0.02t/h, device uncertainty: 0.05%.
Table 5 high-precision wide range flowmeter detects data (5)
Remarks: the liquid table adopts the quality formula flow standard device calibrating of weighing, and surveys with the 100ml measuring cup when flow is lower than 100kg/h; Seized instrument bore: DN50, detected temperatures: 25.3 ℃, starting flow 0.001t/h, device uncertainty: 0.05%.
Visible by above-mentioned demonstration test data to flowmeter of the present invention, flowmeter accuracy of detection of the present invention is high, stable, adapts to the fluid metering of different bores, different medium, and especially the measuring accuracy to low discharge and tiny flow quantity fluid is high.
Claims (10)
1. high-precision wide range flowmeter; Comprise housing (8), housing (8) has the inner chamber that supplies fluid flow, and housing (8) two ends are provided with to be convenient to and the adaptive connecting portion that is connected of fluid-transporting tubing; The centre position of housing (8) inner chamber is provided with the stressed choked flow piece (5) of baffle-like; Stressed choked flow piece (5) is connected with sensor (12), and sensor (12) connects signal processor, it is characterized in that: described housing (8) middle part is provided for quickening to treat the water conservancy diversion cover (1) of fluid measured; Described stressed choked flow piece (5) is positioned at the higher position of housing (8) inner fluid speed, and is in the state that can move to low flow velocity position under the fluid effect.
2. a kind of high-precision wide range flowmeter according to claim 1; It is characterized in that: described housing (8) inner chamber is cylindric, and water conservancy diversion cover (1) is a tubulose, and water conservancy diversion cover (1) external diameter and housing (8) internal diameter coincide and be fixed in housing (8) inside; The thick receipts waist shape in thin two ends in the middle of water conservancy diversion cover (1) inner chamber is; Breach is offered on water conservancy diversion cover (1) top, and breach extends to rear end face by water conservancy diversion cover (1) middle part, and described stressed choked flow piece (5) bottom is by this breach water conservancy diversion cover (1) of packing into.
3. a kind of high-precision wide range flowmeter according to claim 2 is characterized in that: described water conservancy diversion cover (1) upper reaches are provided for the rectifier of preliminary accelerating fluid.
4. a kind of high-precision wide range flowmeter according to claim 3; It is characterized in that: described rectifier is and stops the discoideus of fluid; The rectification hole that a plurality of flow-through fluids are arranged in the center of circle of rectifier upper edge plate face symmetrically and evenly; Rectifier comprises first rectifier (2) and second rectifier (3) that the center line of longshore current body working direction is disposed in order; The external diameter of first rectifier (2) and housing (8) internal diameter coincide, second rectifier (3) external diameter is less than first rectifier (2) external diameter, and two rectifiers (2,3) are mutually from arranging.
5. a kind of high-precision wide range flowmeter according to claim 4 is characterized in that: described water conservancy diversion cover (1) downstream are provided with overload protection spring (14).
6. a kind of high-precision wide range flowmeter according to claim 2; It is characterized in that: described housing (8) connects the backflow by-pass collar; The backflow by-pass collar comprises by-pass pipe, and an end of by-pass pipe inner chamber communicates with water conservancy diversion cover (1) upstream region of housing (8) inner chamber, the other end communicates with water conservancy diversion cover (1) downstream area of housing (8) inner chamber; The by-pass pipe middle part is provided with the cavity volume (16) that volume increases, and cavity volume (16) is gone up the bypass mouth of pipe that is communicated with housing (8) inner chamber in water conservancy diversion cover (1) downstream and sealed by the catch (4) that compression spring (15) supports.
7. a kind of high-precision wide range flowmeter according to claim 5; It is characterized in that: described water conservancy diversion cover (1) downstream are provided with the 3rd, the 4th rectifier (6,7) in proper order; The 4th rectifier (7) is and blocks the discoideus of fluid; The 3rd rectifier (6) is the dome shape of opening towards water conservancy diversion cover (1); The 3rd rectifier (6) external diameter is less than the 4th rectifier (7) external diameter, and the external diameter of the 4th rectifier (7) and housing (8) internal diameter coincide, and described the 4th rectifier (7) is spirally connected with housing (8); Three, the 4th rectifier (6,7) is affixed with same bolt through the connecting hole in centre position, and overload protection spring (14) is installed on the side of the 3rd rectifier (6) towards water conservancy diversion cover (1); Three, the center of circle of the 4th rectifier (6,7) the upper edge plate face rectification hole of arranging a plurality of flow-through fluids symmetrically and evenly.
8. a kind of high-precision wide range flowmeter according to claim 4 is characterized in that: described first, second rectifier (2,3) is affixed with same bolt through the connecting hole in centre position, and described first rectifier (2) is spirally connected with housing (8).
9. a kind of high-precision wide range flowmeter according to claim 6; It is characterized in that: described stressed choked flow piece (5) is connected with sensor (12) by sheet spring (10); Sheet spring (10) the longshore current body working direction even arranging multiplayer that superposes; Each sheet spring (10) size of longshore current body working direction reduces, and each sheet spring (10) upper end is concordant, and the lower end is short more to downstream fluid more.
10. according to any described a kind of high-precision wide range flowmeter in the claim 2 to 9; It is characterized in that: described breach is positioned at (101) 60 ° of minimum positions of oblique water conservancy diversion cover (1) intracavity diameter following, downstream of end face at water conservancy diversion cover (1) middle part and extends; The front side surface of end face (101) lower end and free state lower stress choked flow piece (5) is fitted, and it is 0.05～0.25mm that described stressed choked flow piece (5) its edge under free state overlaps 1 throat's inwall annular space width to water conservancy diversion; The intracavity diameter of water conservancy diversion cover (1) throat is 0.6～0.7: 1 with the ratio of housing 8 intracavity diameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210048109.3A CN102589623B (en) | 2012-02-29 | 2012-02-29 | High-accuracy wide-range flow meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210048109.3A CN102589623B (en) | 2012-02-29 | 2012-02-29 | High-accuracy wide-range flow meter |
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| Publication Number | Publication Date |
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| CN102589623A true CN102589623A (en) | 2012-07-18 |
| CN102589623B CN102589623B (en) | 2014-03-12 |
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| CN201210048109.3A Active CN102589623B (en) | 2012-02-29 | 2012-02-29 | High-accuracy wide-range flow meter |
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| CN105222838A (en) * | 2014-06-30 | 2016-01-06 | 上海思达斯易仪器仪表有限公司 | Flowmeter shell and flowmeter |
| CN106441465A (en) * | 2016-09-18 | 2017-02-22 | 中国核动力研究设计院 | Turbine flowmeter |
| CN110186528A (en) * | 2018-09-07 | 2019-08-30 | 山东思达特测控设备有限公司 | A kind of fairing of fluid flowmeter automatic adjustment circulation area |
| CN110318720A (en) * | 2019-07-19 | 2019-10-11 | 西安思坦仪器股份有限公司 | A kind of wide range orifice flowmeter injection well downhole flow regulator |
| TWI725042B (en) * | 2015-09-09 | 2021-04-21 | 日商山洋電氣股份有限公司 | Measurement device |
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| CN110318720B (en) * | 2019-07-19 | 2024-04-30 | 西安思坦仪器股份有限公司 | Water distributor of wide-range orifice plate flowmeter |
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